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Shareholders' Equity - Regulatory Capital Requirements (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Sep. 30, 2020
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The Company |  |
Common Equity Tier 1 risk-based capital ratio: |  |
Actual capital | $ 1,446,613 | $ 1,687,676
Actual ratio | 9.50% | 12.93%
Capital adequacy guidelines ratio | 4.50% | 4.50%
Tier 1 risk-based capital ratio: |  |
Actual capital | $ 1,746,613 | $ 1,687,676
Actual ratio | 0.1147 | 0.1293
Capital adequacy guidelines ratio | 0.0600 | 0.0600
Total risk-based capital ratio: |  |
Actual capital | $ 1,937,036 | $ 1,851,136
Actual ratio | 0.1272 | 0.1419
Capital adequacy guidelines ratio | 0.0800 | 0.0800
Tier 1 leverage ratio: |  |
Actual capital | $ 1,746,613 | $ 1,687,676
Actual ratio | 0.0907 | 0.0928
Capital adequacy guidelines ratio | 0.0400 | 0.0400
The Bank |  |
Common Equity Tier 1 risk-based capital ratio: |  |
Actual capital | $ 1,717,014 | $ 1,625,478
Actual ratio | 11.28% | 12.46%
Capital adequacy guidelines ratio | 4.50% | 4.50%
Categorized as well capitalized under prompt corrective action provisions ratio | 6.50% | 6.50%
Tier 1 risk-based capital ratio: |  |
Actual capital | $ 1,717,014 | $ 1,625,478
Actual ratio | 0.1128 | 0.1246
Capital adequacy guidelines ratio | 0.0600 | 0.0600
Categorized as well capitalized under prompt corrective action provisions ratio | 0.0800 | 0.0800
Total risk-based capital ratio: |  |
Actual capital | $ 1,907,408 | $ 1,788,904
Actual ratio | 0.1253 | 0.1371
Capital adequacy guidelines ratio | 0.0800 | 0.0800
Categorized as well capitalized under prompt corrective action provisions ratio | 0.1000 | 0.1000
Tier 1 leverage ratio: |  |
Actual capital | $ 1,717,014 | $ 1,625,478
Actual ratio | 0.0892 | 0.0894
Capital adequacy guidelines ratio | 0.0400 | 0.0400
Categorized as well capitalized under prompt corrective action provisions ratio | 0.0500 | 0.0500

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