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Securities Available for Sale (Details) - USD ($)	12 Months Ended
Securities Available for Sale (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2018
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,703,841,000	$ 1,893,618,000
Gross Unrealized Gains	19,914,000	3,010,000
Gross Unrealized Losses	(7,768,000)	(50,363,000)
Estimated Fair Value	1,715,987,000	1,846,265,000
Amount of other than temporary impairment loss recognized	0
Unrealized losses on securities	(9,149,000)	32,705,000
Reclassifications out of accumulated other comprehensive loss	282,000	0	$ 301,000
Reclassification of unrealized losses on equity investments to retained earnings - ASU 2016-01				$ (188,000)
Collateralized Mortgage Obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	735,094,000	914,710,000
Gross Unrealized Gains	4,220,000	1,541,000
Gross Unrealized Losses	(2,659,000)	(21,129,000)
Estimated Fair Value	736,655,000	895,122,000
Mortgage-backed Securities, Residential
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	353,073,000	415,659,000
Gross Unrealized Gains	1,422,000	47,000
Gross Unrealized Losses	(1,598,000)	(13,101,000)
Estimated Fair Value	352,897,000	402,605,000
Mortgage-backed Securities, Commercial
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	541,043,000	481,081,000
Gross Unrealized Gains	13,441,000	1,024,000
Gross Unrealized Losses	(2,360,000)	(12,979,000)
Estimated Fair Value	552,124,000	469,126,000
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	5,000,000	5,000,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(800,000)	(1,174,000)
Estimated Fair Value	4,200,000	3,826,000
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	69,631,000	77,168,000
Gross Unrealized Gains	831,000	398,000
Gross Unrealized Losses	(351,000)	(1,980,000)
Estimated Fair Value	$ 70,111,000	$ 75,586,000
Credit concentration risk \| Stockholders' equity \| Non-US government and agency securities
Debt Securities, Available-for-sale [Line Items]
Maximum exposure to any single issuer	10.00%	10.00%
Available-for-sale Securities
Debt Securities, Available-for-sale [Line Items]
Unrealized losses on securities	$ 9,100,000	$ 32,700,000
Retained Earnings
Debt Securities, Available-for-sale [Line Items]
Reclassification of unrealized losses on equity investments to retained earnings - ASU 2016-01	$ (469,000)			$ (469,000)