Derivatives and Hedging Activities (Tables)

6 Months Ended

Mar. 31, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Fair Value and Balance Sheet Classification

Although management is not aware of any factors that would materially affect the estimated fair value amounts presented below, such amounts have not been comprehensively revalued for purposes of these financial statements since the dates shown, and therefore, estimates of fair value subsequent to those dates may differ significantly from the amounts presented below.



		March 31, 2018				September 30, 2017
	Level in Fair Value Hierarchy	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
		(In thousands)
Financial assets
Cash and cash equivalents	1	$	256,808	$	256,808	$	313,070	$	313,070
Available-for-sale securities
Equity securities	1	495		495		522		522
U.S. government and agency securities	2	183,939		183,939		211,077		211,077
Municipal bonds	2	26,196		26,196		26,624		26,624
Corporate debt securities	2	183,457		183,457		185,298		185,298
Mortgage-backed securities
Agency pass-through certificates	2	866,822		866,822		834,297		834,297
Commercial MBS	2	8,362		8,362		8,391		8,391
Total available-for-sale securities		1,269,271		1,269,271		1,266,209		1,266,209
Held-to-maturity securities
Mortgage-backed securities
Agency pass-through certificates	2	1,701,566		1,652,787		1,646,856		1,635,913
Commercial MBS	2	15,000		15,000		—		—
Total held-to-maturity securities		1,716,566		1,667,787		1,646,856		1,635,913

Loans receivable	3	11,224,088		11,514,350		10,882,622		11,247,586
FDIC indemnification asset	3	—		—		8,968		8,564
FHLB and FRB stock	2	126,990		126,990		122,990		122,990
Other assets - interest rate contracts	2	8,617		8,617		1,139		1,139
Other assets - commercial loan hedges	2	2,217		2,217		—		—
Other assets - borrowings hedges	2	15,328		15,328		—		—

Financial liabilities
Customer accounts	2	11,138,856		10,627,045		10,835,008		10,411,686
FHLB advances	2	2,325,000		2,327,701		2,225,000		2,266,791
Other liabilities - interest rate contracts	2	8,617		8,617		1,139		1,139
Other liabilities - commercial loan hedges	2	—		—		174		174
Other liabilities - borrowings hedges	2	—		—		1,693		1,693

The following table presents the fair value and balance sheet classification of derivatives at March 31, 2018 and September 30, 2017:



	Asset Derivatives						Liability Derivatives
	March 31, 2018			September 30, 2017			March 31, 2018			September 30, 2017
	Balance Sheet			Balance Sheet			Balance Sheet			Balance Sheet
	Location	Fair Value		Location	Fair Value		Location	Fair Value		Location	Fair Value
	(In thousands)
Interest rate contracts	Other assets	$	8,617	Other assets	$	1,139	Other liabilities	$	8,617	Other liabilities	$	1,139
Commercial loan hedges	Other assets	2,217		Other assets	—		Other liabilities	—		Other liabilities	174
Borrowings hedges	Other assets	15,328		Other assets	—		Other liabilities	—		Other liabilities	1,693
		$	26,162		$	1,139		$	8,617		$	3,006