Capitalized servicing assets (Tables)

12 Months Ended

Dec. 31, 2017

Transfers And Servicing [Abstract]

Servicing Asset at Amortized Cost

Changes in capitalized servicing assets were as follows:

	Residential Mortgage Loans									Commercial Mortgage Loans
For the Year Ended December 31,	2017			2016			2015			2017			2016			2015
	(In thousands)
Beginning balance	$	117,351		$	118,303		$	109,871		$	103,764		$	83,692		$	72,939
Originations		28,792			28,618			35,556			34,620			40,117			29,914
Purchases		699			638			243			—			—			—
Amortization		(31,864	)		(30,208	)		(27,367	)		(24,308	)		(20,045	)		(19,161	)
		114,978			117,351			118,303			114,076			103,764			83,692
Valuation allowance		—			—			—			—			—			—
Ending balance, net	$	114,978		$	117,351		$	118,303		$	114,076		$	103,764		$	83,692
	Other									Total
For the Year Ended December 31,	2017			2016			2015			2017			2016			2015
	(In thousands)
Beginning balance	$	—		$	729		$	4,107		$	221,115		$	202,724		$	186,917
Originations		—			—			—			63,412			68,735			65,470
Purchases		—			—			—			699			638			243
Amortization		—			(729	)		(3,378	)		(56,172	)		(50,982	)		(49,906	)
		—			—			729			229,054			221,115			202,724
Valuation allowance		—			—			—			—			—			—
Ending balance, net	$	—		$	—		$	729		$	229,054		$	221,115		$	202,724

Economic Assumptions Used to Determine Fair Value of Capitalized Servicing Rights and Sensitivity of Value to Changes in Assumptions

	Residential			Commercial
Weighted-average prepayment speeds		12.16	%
Impact on fair value of 10% adverse change	$	(8,935,000	)
Impact on fair value of 20% adverse change		(17,159,000	)
Weighted-average OAS		10.67	%
Impact on fair value of 10% adverse change	$	(6,838,000	)
Impact on fair value of 20% adverse change		(13,267,000	)
Weighted-average discount rate					18.00	%
Impact on fair value of 10% adverse change				$	(5,885,000	)
Impact on fair value of 20% adverse change					(11,342,000	)