What Is Core Banking? Definition & How It Works

Core banking is the centralized system that runs a bank's daily operations, and understanding how a core banking system works is the starting point for evaluating any bank's technology stack. Every transaction a bank deals with runs through this one system on the back end, and it determines the bank's ability to offer new products as well as deliver great customer service.

In this article, we examine what core banking is, how a core banking system works, its key features, and the deployment options and benefits behind modern core banking software.

What is core banking?

Core banking is a system that runs the daily operations of a bank. The "core" in core banking stands for Centralized Online Real-time Environment.

Each branch and branch location is linked to the same data from the bank's central database. This means that the information that a customer sees from each branch is the same.

Previously, banks updated each branch's information overnight. Core banking systems replaced this process with the ability to update each bank's account information at the moment that a transaction occurred. This means that customer information is reflected across all channels in the bank.

How does a core banking system work?

A core banking system links every branch of a bank to a central database that displays information in real time.

Every time a customer performs a transaction within a bank, that transaction is added to the central database. That transaction is then visible to every other branch of that bank. For example, if a customer makes a transaction in the middle of the night through the bank's mobile application, the information will be reflected in every branch of the bank when they show up the next day. This is the reason that banks utilize a real-time database to track every transaction for each bank customer.

Core banking system architecture

Core banking system architecture is made up of a few different layers. Each of these layers has specific responsibilities within the bank.

Each transaction goes through these layers to get from the customer to the bank's data and back again. This process takes only a few seconds.

The architecture behind a core banking system is important to those in banking and finance to understand how a bank's data and applications interact, and how they might be changed.

Key features of a core banking system

Account management

Account management automates each stage of a bank account. When a customer opens a bank account, their information is stored and linked to the bank account. The bank can open the account, add the customer as a customer of the bank, assign an account number, and begin to track the customer's account activities over time.

Real-time transaction processing

Real-time transaction processing automatically deposits, withdraws, and processes payments from customers in real time. This kind of real-time processing is reflected across all bank locations.

Loan and credit management

Loan and credit management allow banks to automate the loan process of a customer from start to finish. The customer can take out a loan, and the bank releases the loan to the customer. The bank then tracks the repayment of that loan.

Payment switching and network connectivity

Payment switching and network connectivity rely on core-banking system integration to let a bank's core banking system connect to different networks and processing centers. For example, the bank could connect to SWIFT or SEPA networks to process wire transfers for its customers.

Compliance and risk tools

Banks are required to follow certain regulations regarding their customers and the transactions they perform. Compliance software built into a core banking system allows the bank to fulfill those regulations automatically for every customer. This includes KYC (Know Your Customer) checks, which confirm a customer's identity before an account is opened, and AML (anti-money laundering) monitoring, which screens transactions for suspicious activity as they happen. Handling both inside the core system means every account is checked the same way, without relying on manual review for every customer.

Reporting and analytics

A bank has a general ledger that contains all of the bank's financial information. Reporting and analytics within the core banking system allow a bank to automatically generate financial reports from the bank's general ledger. These financial reports are presented to the bank's executives and other stakeholders.

Types of core banking deployment

On-premises core banking

On-premises means that the software will run on the bank's servers. This means that they will have full control over the software, but will also have to take on the cost of ownership and the data control as well. It is also slower to update the system with on-premises software.

Cloud-based core banking

Cloud-based means that the software will run on someone else's servers, typically a technology provider. It was built with modularity and APIs in mind. This means that individual modules can be added, removed, or updated. This means it is much quicker to scale the bank and to respond to regulations.

Hybrid deployment

A bank can choose to use both on-premises and cloud-based software. Some banks choose to keep their older software on-premises but use cloud technology to provide new features. This option is used when the bank does not want to risk a complete system change or when the cost of doing so would be prohibitive.

The role of core banking in modern digital banking

The software is used by banks to provide the customer experience with mobile banking applications and websites. Every banking transaction performed on a customer-facing mobile application uses the core banking software to complete that task for that bank.

The mobile application or website is the front end for the bank. The core banking software is the back end that performs the banking functions.

When core banking software uses APIs, other applications can connect to these banks' software to provide banking features. This same API-first approach is what underpins open banking, where a customer can allow their account data or payment initiation to be shared with a third-party app, and Banking as a Service (BaaS), where a licensed bank exposes its core banking software so other companies can offer banking features under their own brand. Under BaaS, these companies will not have to own a banking software license themselves.

DECTA's Digital Banking Platform: core banking in practice

DECTA's own Digital Banking Platform is an example of a core banking platform put into practice. This platform is designed to be a modular, cloud-based front end to a bank's existing core banking software and general ledger software. A licensed financial institution (bank, EMI, or PI) will receive the benefits of having a customer- and merchant-facing digital banking platform with modules for managing customer accounts and merchants' accounts, bank cards, and transactions, lending services, and KYC/AML checks.

By avoiding having to build the front end of the digital banking platform on top of their existing core banking software, banks will be able to deploy and launch their Digital Banking Platform directly into the market. This is exactly the function of a modern, API-enabled digital banking platform as opposed to the older, non-connected systems.

Legacy core banking systems vs. next-generation systems

Many banks use systems that are decades old. These systems were built as an integrated system of software, but have become outdated and hard to update. Any change to the software may impact another area of the software.

Next-generation software is built in a modular fashion with APIs so that individual software components can be updated without impacting the rest of the code.

If a bank is using an outdated system, it is difficult to simply replace the system with next-generation software. Banks may need to move all of a bank's account information and transactions from the old system to a new general ledger and core banking system. This is a complex process that may take several years to complete.

That risk is exactly why banks typically choose the alternative of a hybrid deployment to modernize their banking software gradually rather than all at once.