Stockholders' Equity (Tables)

12 Months Ended

Sep. 30, 2017

Equity [Abstract]

Schedule of compliance with regulatory capital requirements

	Actual				Capital Adequacy Guidelines		Categorized as Well Capitalized Under Prompt Corrective Action Provisions
	Capital		Ratio		Ratio		Ratio
September 30, 2017	(In thousands)
Common Equity Tier 1 risk-based capital ratio:
The Company	$	1,701,327	16.67	%	4.50	%	NA
The Bank	1,668,314		16.35		4.50		6.50	%
Tier 1 risk-based capital ratio:
The Company	1,701,327		16.67		6.00		NA
The Bank	1,668,314		16.35		6.00		8.00
Total risk-based capital ratio:
The Company	1,828,935		17.92		8.00		NA
The Bank	1,795,929		17.60		8.00		10.00
Tier 1 leverage ratio:
The Company	1,701,327		11.49		4.00		NA
The Bank	1,668,314		11.27		4.00		5.00
September 30, 2016
Common Equity Tier 1 risk-based capital ratio:
The Company	$	1,690,380	17.54	%	4.50	%	NA
The Bank	1,668,828		17.32		4.50		6.50	%
Tier 1 risk-based capital ratio:
The Company	1,690,380		17.54		6.00		NA
The Bank	1,668,828		17.32		6.00		8.00
Total risk-based capital ratio:
The Company	1,807,740		18.76		8.00		NA
The Bank	1,786,188		18.54		8.00		10.00
Tier 1 leverage ratio:
The Company	1,690,380		11.60		4.00		NA
The Bank	1,668,828		11.45		4.00		5.00

Schedule of weighted average number of shares

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

Year ended September 30,	2017		2016		2015
Weighted average shares outstanding	88,905,457		91,399,038		95,644,639
Weighted average dilutive warrants	242,979		440,366		340,016
Weighted average dilutive options	75,771		73,514		69,304
Weighted average diluted shares	89,224,207		91,912,918		96,053,959
Net income (In thousands)	$	173,532	$	164,049	$	160,316
Basic EPS	$	1.95	$	1.79	$	1.68
Diluted EPS	1.94		1.78		1.67