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SHAREHOLDERS' EQUITY - Regulatory Capital Requirements (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Sep. 30, 2024
The Company    
Common Equity Tier 1 risk-based capital ratio:    
Actual capital $ 2,202,901 $ 2,153,721
Actual ratio 11.77% 11.31%
Capital adequacy guidelines ratio 4.50% 4.50%
Tier 1 risk-based capital ratio:    
Actual capital $ 2,502,901 $ 2,453,721
Actual ratio 0.1337 0.1288
Capital adequacy guidelines ratio 0.0600 0.0600
Total risk-based capital ratio:    
Actual capital $ 2,770,166 $ 2,722,290
Actual ratio 0.1480 0.1429
Capital adequacy guidelines ratio 0.0800 0.0800
Tier 1 leverage ratio:    
Actual capital $ 2,502,901 $ 2,453,721
Actual ratio 0.0959 0.0890
Capital adequacy guidelines ratio 0.0400 0.0400
The Bank    
Common Equity Tier 1 risk-based capital ratio:    
Actual capital $ 2,506,271 $ 2,463,266
Actual ratio 13.40% 12.94%
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 $ 2,506,271 $ 2,463,266
Actual ratio 0.1340 0.1294
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 $ 2,721,890 $ 2,681,116
Actual ratio 0.1455 0.1408
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 $ 2,506,271 $ 2,463,266
Actual ratio 0.0961 0.0894
Capital adequacy guidelines ratio 0.0400 0.0400
Categorized as well capitalized under prompt corrective action provisions ratio 0.0500 0.0500