Capitalized servicing assets (Tables)

12 Months Ended

Dec. 31, 2019

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,	2019			2018			2017			2019			2018			2017
	(In thousands)
Beginning balance	$	120,509		$	114,978		$	117,351		$	114,663		$	114,076		$	103,764
Originations		26,067			28,985			28,792			41,370			26,298			34,620
Purchases		144,326			454			699			—			—			—
Amortization		(46,491	)		(23,908	)		(31,864	)		(25,397	)		(25,711	)		(24,308	)
		244,411			120,509			114,978			130,636			114,663			114,076
Valuation allowance		(7,000	)		—			—			—			—			—
Ending balance, net	$	237,411		$	120,509		$	114,978		$	130,636		$	114,663		$	114,076

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

	Residential			Commercial
	(Dollars in thousands)
Weighted-average prepayment speeds		15.84	%
Impact on fair value of 10% adverse change	$	(16,555	)
Impact on fair value of 20% adverse change		(31,475	)
Weighted-average OAS		9.28	%
Impact on fair value of 10% adverse change	$	(8,070	)
Impact on fair value of 20% adverse change		(15,663	)
Weighted-average discount rate					18.00	%
Impact on fair value of 10% adverse change				$	(6,948	)
Impact on fair value of 20% adverse change					(13,395	)