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Shareholders' Equity (Tables)
 12 Months Ended
Sep. 30, 2024
Equity [Abstract]  
Schedule of Compliance with Regulatory Capital Requirements
As of September 30, 2024, and 2023, the Company and the Bank met all capital adequacy requirements to which they are subject, and the Bank's regulators categorized it as well capitalized under the regulatory framework for prompt corrective action. To be categorized as well capitalized, the Bank must maintain minimum Common Equity Tier 1, Tier 1 risk-based, Total risk-based and Tier 1 leverage ratios as set forth in the following table. The Bank's actual capital amounts and ratios as of these dates are also presented. There are no conditions or events since that management believes have changed the Bank's categorization.

 ActualCapital Adequacy
Guidelines		Categorized as Well Capitalized Under Prompt Corrective Action Provisions
  
CapitalRatioRatioRatio
September 30, 2024($ in thousands)
Common Equity Tier 1 risk-based capital ratio:
The Company$2,153,721 11.31 %4.50 %NA
The Bank2,463,266 12.94 4.50 6.50 %
Tier 1 risk-based capital ratio:
The Company2,453,721 12.88 6.00 NA
The Bank2,463,266 12.94 6.00 8.00 
Total risk-based capital ratio:
The Company2,722,290 14.29 8.00 NA
The Bank2,681,116 14.08 8.00 10.00 
Tier 1 leverage ratio:
The Company2,453,721 8.90 4.00 NA
The Bank2,463,266 8.94 4.00 5.00 
September 30, 2023
Common Equity Tier 1 risk-based capital ratio:
The Company$1,769,170 10.37 %4.50 %NA
The Bank1,982,943 11.63 4.50 6.50 %
Tier 1 risk-based capital ratio:
The Company2,069,170 12.12 6.00 NA
The Bank1,982,943 11.63 6.00 8.00 
Total risk-based capital ratio:
The Company2,270,877 13.31 8.00 NA
The Bank2,184,650 12.81 8.00 10.00 
Tier 1 leverage ratio:
The Company2,069,170 9.39 4.00 NA
The Bank1,982,943 9.10 4.00 5.00 
Schedule of Earnings Per Share Calculation
The following table sets forth information regarding earnings per common share calculations.
Year ended September 30,202420232022
Weighted average shares outstanding74,244,323 65,192,510 65,287,650 
Weighted average dilutive options46,245 62,773 116,460 
Weighted average diluted shares74,290,568 65,255,283 65,404,110 
Net income available to common shareholders (in thousands)$185,416 $242,801 $221,705 
Basic EPS$2.50 $3.72 $3.40 
Diluted EPS2.50 3.72 3.39