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Investment Securities Schedule of Amortized Cost and Fair Values of Investment Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Schedule of Investments [Line Items]
Amortized Cost	$ 2,168,885
Gross Unrealized Gains	16,485
Gross Unrealized Losses	(25,564)
Estimated Fair Value	2,159,806	$ 2,080,294
Amortized Cost, Held to Maturity	588,443	606,679
Gross Unrealized Gains, Held to Maturity	15,164	4,833
Gross Unrealized Losses, Held to Maturity	0	(93)
Held to maturity investment securities	603,607	611,419
U.S. Government-Sponsored Agency Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	26,900
Gross Unrealized Gains	624
Gross Unrealized Losses	0
Estimated Fair Value	27,524
Amortized Cost		31,586
Gross Unrealized Gains		185
Gross Unrealized Losses		(139)
Estimated Fair Value		31,632
US States and Political Subdivisions Debt Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	293,116
Gross Unrealized Gains	5,840
Gross Unrealized Losses	(1,272)
Estimated Fair Value	297,684
Amortized Cost, Held to Maturity	155,998	156,134
Gross Unrealized Gains, Held to Maturity	5,710	1,166
Gross Unrealized Losses, Held to Maturity	0	(93)
Held to maturity investment securities	161,708	157,207
Amortized Cost		282,383
Gross Unrealized Gains		2,178
Gross Unrealized Losses		(5,466)
Estimated Fair Value		279,095
Corporate Debt Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	122,006
Gross Unrealized Gains	1,610
Gross Unrealized Losses	(2,328)
Estimated Fair Value	121,288
Amortized Cost		111,454
Gross Unrealized Gains		1,432
Gross Unrealized Losses		(3,353)
Estimated Fair Value		109,533
Collateralized Mortgage Obligations [Member]
Schedule of Investments [Line Items]
Amortized Cost	889,046
Gross Unrealized Gains	5,561
Gross Unrealized Losses	(7,202)
Estimated Fair Value	887,405
Amortized Cost		841,294
Gross Unrealized Gains		2,758
Gross Unrealized Losses		(11,972)
Estimated Fair Value		832,080
Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	447,924
Gross Unrealized Gains	1,530
Gross Unrealized Losses	(8,596)
Estimated Fair Value	440,858
Amortized Cost, Held to Maturity	432,445	450,545
Gross Unrealized Gains, Held to Maturity	9,454	3,667
Gross Unrealized Losses, Held to Maturity	0	0
Held to maturity investment securities	441,899	454,212
Amortized Cost		476,973
Gross Unrealized Gains		1,583
Gross Unrealized Losses		(15,212)
Estimated Fair Value		463,344
Commercial Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	282,483
Gross Unrealized Gains	1,320
Gross Unrealized Losses	(1,566)
Estimated Fair Value	282,237
Amortized Cost		264,165
Gross Unrealized Gains		524
Gross Unrealized Losses		(3,073)
Estimated Fair Value		261,616
Auction Rate Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	107,410
Gross Unrealized Gains	0
Gross Unrealized Losses	(4,600)
Estimated Fair Value	$ 102,810
Amortized Cost		107,410
Gross Unrealized Gains		0
Gross Unrealized Losses		(4,416)
Estimated Fair Value		102,994
Debt Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost		2,115,265
Gross Unrealized Gains		8,660
Gross Unrealized Losses		(43,631)
Estimated Fair Value		$ 2,080,294

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