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Shareholders' Equity - Regulatory Capital Requirements (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Sep. 30, 2022
The Company    
Common Equity Tier 1 risk-based capital ratio:    
Actual capital $ 1,769,170 $ 1,613,075
Actual ratio 10.37% 9.86%
Capital adequacy guidelines ratio 4.50% 4.50%
Tier 1 risk-based capital ratio:    
Actual capital $ 2,069,170 $ 1,913,075
Actual ratio 0.1212 0.1169
Capital adequacy guidelines ratio 0.0600 0.0600
Total risk-based capital ratio:    
Actual capital $ 2,270,877 $ 2,117,574
Actual ratio 0.1331 0.1294
Capital adequacy guidelines ratio 0.0800 0.0800
Tier 1 leverage ratio:    
Actual capital $ 2,069,170 $ 1,913,075
Actual ratio 0.0939 0.0951
Capital adequacy guidelines ratio 0.0400 0.0400
The Bank    
Common Equity Tier 1 risk-based capital ratio:    
Actual capital $ 1,982,943 $ 1,781,932
Actual ratio 11.63% 10.89%
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 $ 1,982,943 $ 1,781,932
Actual ratio 0.1163 0.1089
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 $ 2,184,650 $ 1,986,434
Actual ratio 0.1281 0.1214
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 $ 1,982,943 $ 1,781,932
Actual ratio 0.0910 0.0886
Capital adequacy guidelines ratio 0.0400 0.0400
Categorized as well capitalized under prompt corrective action provisions ratio 0.0500 0.0500