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Shareholders' Equity - Regulatory Capital Requirements (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Sep. 30, 2020
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