Shareholders' Equity (Tables)

12 Months Ended

Sep. 30, 2020

Equity [Abstract]

Schedule of compliance with regulatory capital requirements

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, 2020	($ in thousands)
Common Equity Tier 1 risk-based capital ratio:
The Company	$	1,687,676	12.93	%	4.50	%	NA
The Bank	1,625,478		12.46		4.50		6.50	%
Tier 1 risk-based capital ratio:
The Company	1,687,676		12.93		6.00		NA
The Bank	1,625,478		12.46		6.00		8.00
Total risk-based capital ratio:
The Company	1,851,136		14.19		8.00		NA
The Bank	1,788,904		13.71		8.00		10.00
Tier 1 leverage ratio:
The Company	1,687,676		9.28		4.00		NA
The Bank	1,625,478		8.94		4.00		5.00
September 30, 2019
Common Equity Tier 1 risk-based capital ratio:
The Company	$	1,710,147	14.30	%	4.50	%	NA
The Bank	1,666,426		13.93		4.50		6.50	%
Tier 1 risk-based capital ratio:
The Company	1,710,147		14.30		6.00		NA
The Bank	1,666,426		13.93		6.00		8.00
Total risk-based capital ratio:
The Company	1,848,581		15.45		8.00		NA
The Bank	1,804,860		15.09		8.00		10.00
Tier 1 leverage ratio:
The Company	1,710,147		10.51		4.00		NA
The Bank	1,666,426		10.24		4.00		5.00

Schedule of earnings per share calculation

The following table sets forth information regarding earnings per share calculations.

Year ended September 30,	2020		2019		2018
Weighted average shares outstanding	76,721,969		80,471,316		85,008,040
Weighted average dilutive warrants	—		4,448		63,079
Weighted average dilutive options	9,495		19,399		38,724
Weighted average diluted shares	76,731,464		80,495,163		85,109,843
Net income (In thousands)	$	173,438	$	210,256	$	203,850
Basic EPS	$	2.26	$	2.61	$	2.40
Diluted EPS	2.26		2.61		2.40