Derivatives and Hedging Activities (Tables)

12 Months Ended

Sep. 30, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Fair value of financial instruments by balance sheet grouping

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.



		September 30, 2018				September 30, 2017
	Level	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
		(In thousands)
Financial assets
Cash and cash equivalents	1	$	268,650	$	268,650	$	313,070	$	313,070
Available-for-sale securities:
Equity securities	1	488		488		522		522
U.S. government and agency securities	2	207,293		207,293		211,077		211,077
Municipal bonds	2	22,978		22,978		26,624		26,624
Corporate debt securities	2	184,695		184,695		185,298		185,298
Mortgage-backed securities
Agency pass-through certificates	2	896,041		896,041		834,297		834,297
Commercial MBS	2	3,462		3,462		8,391		8,391
Total available-for-sale securities		1,314,957		1,314,957		1,266,209		1,266,209
Held-to-maturity securities:
Mortgage-backed securities
Agency pass-through certificates	2	1,610,420		1,533,742		1,646,856		1,635,913
Other debt securities		15,000		15,028		—		—
Total held-to-maturity securities		1,625,420		1,548,770		1,646,856		1,635,913

Loans receivable	3	11,477,081		11,556,325		10,882,622		11,247,586
FHLB and FRB stock	2	127,190		127,190		122,990		122,990
Other assets - interest rate contracts	2	12,731		12,731		1,139		1,139
Other assets - commercial loan hedges	2	3,857		3,857		—		—
Other assets - borrowing hedges	2	22,250		22,250		—		—

Financial liabilities
Customer accounts	2	11,387,146		10,882,862		10,835,008		10,411,686
FHLB advances and other borrowings	2	2,330,000		2,316,964		2,225,000		2,266,791
Other liabilities - interest rate contracts	2	12,731		12,731		1,139		1,139
Other liabilities - commercial loan hedges	2	—		—		174		174
Other liabilities - long term borrowing hedges	2	—		—		1,693		1,693

The following table presents the fair value and balance sheet classification of derivatives outstanding.



	Asset Derivatives						Liability Derivatives
	September 30, 2018			September 30, 2017			September 30, 2018			September 30, 2017
(In thousands)	Balance Sheet	Fair Value		Balance Sheet	Fair Value		Balance Sheet	Fair Value		Balance Sheet	Fair Value
Interest rate contracts	Other assets	$	12,731	Other assets	$	1,139	Other liabilities	$	12,731	Other liabilities	$	1,139
Commercial loan hedges	Other assets	3,857		Other assets	—		Other liabilities	—		Other liabilities	174
Borrowing hedges	Other assets	22,250		Other assets	—		Other liabilities	—		Other liabilities	1,693
		$	38,838		$	1,139		$	12,731		$	3,006