IRB-Compliant Models in Retail Banking

Robina Nankervis and Maxine Nelson

Contents
1.

Development and Validation of Key Estimates for Capital Models

2.

Explaining the Correlation in Basel II: Derivation and Evaluation

3.

Explaining the Credit Risk Elements in Basel II

4.

Loss Given Default and Recovery Risk: From Basel II Standards to Effective Risk Management Tools

5.

Assessing the Validity of Basel II Models in Measuring Risk of Credit Portfolios

6.

Measuring Counterparty Credit Risk for Trading Products under Basel II

7.

Implementation of an IRB-Compliant Rating System

8.

Stress Tests of Banks’ Regulatory Capital Adequacy: Application to Tier 1 Capital and to Pillar 2 Stress Tests

9.

Advanced Credit Model Performance Testing to Meet Basel Requirements: How Things Have Changed!

10.

Designing and Implementing a Basel II Compliant PIT–TTC Ratings Framework

11.

Basel II in the Light of Moody’s KMV Evidence

12.

Basel II Capital Adequacy Rules for Retail Exposures

13.

IRB-Compliant Models in Retail Banking

14.

Basel II Capital Adequacy Rules for Securitisations

15.

Regulatory Priorities and Expectations in the Implementation of the IRB Approach

16.

Market Discipline and Appropriate Disclosure in Basel II

17.

Validation of Banks’ Internal Rating Systems – A Supervisory Perspective

18.

Rebalancing the Three Pillars of Basel II

19.

Implementing a Basel II Scenario-Based AMA for Operational Risk

20.

Loss Distribution Approach in Practice

21.

An Operational Risk Rating Model Approach to Better Measurement and Management of Operational Risk

22.

Constructing an Operational Event Database

23.

Insurance and Operational Risk

INTRODUCTION

This chapter describes the challenge that retail banking units are facing in order to satisfy the requirements of an IRB approach within Basel II. It must not be forgotten that the IRB approach is not the only way to satisfy future regulation but merely an option. However, a large number of organisations that have chosen to aim for an IRB approach are also building more than is required from a regulatory perspective and treating the work as being more about improving the risk management capability of the organisation than complying with regulations. And this makes sense: only time will tell how many non-IRB-compliant organisations remain, but some early predictions suggest that those that choose the standardised approach could be competitively disadvantaged or, at worst, likely candidates for takeover.

This chapter focuses on providing a pragmatic account of how to develop the models required to satisfy the IRB requirements for a retail banking organisation. The chapter frequently refers to a “bank”, but obviously all the content of this chapter is equally valid for other retail lending organisations, in particular building societies and other mutual organisations.

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