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Securities Available for Sale (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 1,893,618	$ 1,751,879
Gross Unrealized Gains	3,010	1,466
Gross Unrealized Losses	(50,363)	(33,088)
Estimated Fair Value	1,846,265	1,720,257
Amount of other than temporary impairment loss recognized	0
Unrealized losses on securities	32,705	21,781
Reclassifications out of accumulated other comprehensive loss	0	301	$ 950
Reclassification of unrealized losses on equity investments to retained earnings - ASU 2016-01				$ (188)
Collateralized Mortgage Obligations
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	914,710	856,193
Gross Unrealized Gains	1,541	58
Gross Unrealized Losses	(21,129)	(17,542)
Estimated Fair Value	895,122	838,709
Mortgage-backed Securities, Residential
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	415,659	477,676
Gross Unrealized Gains	47	521
Gross Unrealized Losses	(13,101)	(6,983)
Estimated Fair Value	402,605	471,214
Mortgage-backed Securities, Commercial
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	481,081	308,046
Gross Unrealized Gains	1,024	0
Gross Unrealized Losses	(12,979)	(6,681)
Estimated Fair Value	469,126	301,365
Corporate securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,000	4,997
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1,174)	(522)
Estimated Fair Value	3,826	4,475
Municipal securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	77,168	82,542
Gross Unrealized Gains	398	870
Gross Unrealized Losses	(1,980)	(875)
Estimated Fair Value	$ 75,586	82,537
Total debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		1,729,454
Gross Unrealized Gains		1,449
Gross Unrealized Losses		(32,603)
Estimated Fair Value		1,698,300
Mutual funds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		22,425
Gross Unrealized Gains		17
Gross Unrealized Losses		(485)
Estimated Fair Value		21,957
Credit concentration risk | Stockholders' equity | Non-US government and agency securities
Schedule of Available-for-sale Securities [Line Items]
Maximum exposure to any single issuer	10.00%
Available-for-sale Securities
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses on securities	$ 32,700	$ 21,800
Retained Earnings
Schedule of Available-for-sale Securities [Line Items]
Reclassification of unrealized losses on equity investments to retained earnings - ASU 2016-01	(469)			$ (469)
Retained Earnings | Accounting Standards Update 2016-01
Schedule of Available-for-sale Securities [Line Items]
Reclassification of unrealized losses on equity investments to retained earnings - ASU 2016-01	$ 469

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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