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Shareholders' Equity - Regulatory Capital Requirements (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Sep. 30, 2021
The Company    
Common Equity Tier 1 risk-based capital ratio:    
Actual capital $ 1,613,075 $ 1,446,613
Actual ratio 9.86% 9.50%
Capital adequacy guidelines ratio 4.50% 4.50%
Tier 1 risk-based capital ratio:    
Actual capital $ 1,913,075 $ 1,746,613
Actual ratio 0.1169 0.1147
Capital adequacy guidelines ratio 0.0600 0.0600
Total risk-based capital ratio:    
Actual capital $ 2,117,574 $ 1,937,036
Actual ratio 0.1294 0.1272
Capital adequacy guidelines ratio 0.0800 0.0800
Tier 1 leverage ratio:    
Actual capital $ 1,913,075 $ 1,746,613
Actual ratio 0.0951 0.0907
Capital adequacy guidelines ratio 0.0400 0.0400
The Bank    
Common Equity Tier 1 risk-based capital ratio:    
Actual capital $ 1,781,932 $ 1,717,014
Actual ratio 10.89% 11.28%
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 $ 1,781,932 $ 1,717,014
Actual ratio 0.1089 0.1128
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 $ 1,986,434 $ 1,907,408
Actual ratio 0.1214 0.1253
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 $ 1,781,932 $ 1,717,014
Actual ratio 0.0886 0.0892
Capital adequacy guidelines ratio 0.0400 0.0400
Categorized as well capitalized under prompt corrective action provisions ratio 0.0500 0.0500