Shareholders' Equity (Tables)

12 Months Ended

Sep. 30, 2023

Equity [Abstract]

Schedule of Compliance with Regulatory Capital Requirements

As of September 30, 2023, and 2022, 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.

	Actual				Capital Adequacy Guidelines		Categorized as Well Capitalized Under Prompt Corrective Action Provisions
	Capital		Ratio		Ratio		Ratio
September 30, 2023	($ in thousands)
Common Equity Tier 1 risk-based capital ratio:
The Company	$	1,769,170	10.37	%	4.50	%	NA
The Bank	1,982,943		11.63		4.50		6.50	%
Tier 1 risk-based capital ratio:
The Company	2,069,170		12.12		6.00		NA
The Bank	1,982,943		11.63		6.00		8.00
Total risk-based capital ratio:
The Company	2,270,877		13.31		8.00		NA
The Bank	2,184,650		12.81		8.00		10.00
Tier 1 leverage ratio:
The Company	2,069,170		9.39		4.00		NA
The Bank	1,982,943		9.10		4.00		5.00
September 30, 2022
Common Equity Tier 1 risk-based capital ratio:
The Company	$	1,613,075	9.86	%	4.50	%	NA
The Bank	1,781,932		10.89		4.50		6.50	%
Tier 1 risk-based capital ratio:
The Company	1,913,075		11.69		6.00		NA
The Bank	1,781,932		10.89		6.00		8.00
Total risk-based capital ratio:
The Company	2,117,574		12.94		8.00		NA
The Bank	1,986,434		12.14		8.00		10.00
Tier 1 leverage ratio:
The Company	1,913,075		9.51		4.00		NA
The Bank	1,781,932		8.86		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,	2023		2022		2021
Weighted average shares outstanding	65,192,510		65,287,650		72,529,188
Weighted average dilutive options	62,773		116,460		36,732
Weighted average diluted shares	65,255,283		65,404,110		72,565,920
Net income available to common shareholders (in thousands)	$	242,801	$	221,705	$	173,581
Basic EPS	$	3.72	$	3.40	$	2.39
Diluted EPS	3.72		3.39		2.39