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Investment Securities Schedule of Amortized Cost and Fair Values of Investment Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Schedule of Investments [Line Items]
Amortized Cost	$ 2,071,734
Gross Unrealized Gains	4,205
Gross Unrealized Losses	(67,123)
Estimated Fair Value	2,008,816
Amortized Cost, Held to Maturity	626,597	$ 0
Gross Unrealized Gains, Held to Maturity	2
Gross Unrealized Losses, Held to Maturity	(3,747)
Securities held to maturity	622,852
Amortized Cost		2,575,719
Gross Unrealized Gains		13,062
Gross Unrealized Losses		(40,825)
Estimated Fair Value		2,547,956
Pooled Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	0	0
Estimated Fair Value	875	707
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held	11,500		$ 11,500
U.S. Government-Sponsored Agency Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	31,527
Gross Unrealized Gains	1
Gross Unrealized Losses	(437)
Estimated Fair Value	31,091
Amortized Cost		5,962
Gross Unrealized Gains		2
Gross Unrealized Losses		(26)
Estimated Fair Value		5,938
US States and Political Subdivisions Debt Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	269,582
Gross Unrealized Gains	1,281
Gross Unrealized Losses	(9,723)
Estimated Fair Value	261,140
Amortized Cost, Held to Maturity	156,267
Gross Unrealized Gains, Held to Maturity	0
Gross Unrealized Losses, Held to Maturity	(2,006)
Securities held to maturity	154,261
Amortized Cost		405,860
Gross Unrealized Gains		5,638
Gross Unrealized Losses		(2,549)
Estimated Fair Value		408,949
Corporate Debt Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	93,482	96,353
Gross Unrealized Gains	950
Gross Unrealized Losses	(2,142)
Estimated Fair Value	92,290	97,309
Amortized Cost		96,353
Gross Unrealized Gains		2,832
Gross Unrealized Losses		(1,876)
Estimated Fair Value		97,309
Collateralized Mortgage Obligations [Member]
Schedule of Investments [Line Items]
Amortized Cost	820,150
Gross Unrealized Gains	100
Gross Unrealized Losses	(23,016)
Estimated Fair Value	797,234
Amortized Cost		611,927
Gross Unrealized Gains		491
Gross Unrealized Losses		(9,795)
Estimated Fair Value		602,623
Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	497,614
Gross Unrealized Gains	1,873
Gross Unrealized Losses	(21,310)
Estimated Fair Value	478,177
Amortized Cost, Held to Maturity	470,330
Gross Unrealized Gains, Held to Maturity	2
Gross Unrealized Losses, Held to Maturity	(1,741)
Securities held to maturity	468,591
Amortized Cost		1,132,080
Gross Unrealized Gains		3,957
Gross Unrealized Losses		(15,241)
Estimated Fair Value		1,120,796
Commercial Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	251,969
Gross Unrealized Gains	0
Gross Unrealized Losses	(6,218)
Estimated Fair Value	245,751
Amortized Cost		215,351
Gross Unrealized Gains		0
Gross Unrealized Losses		(2,596)
Estimated Fair Value		212,755
Auction Rate Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	107,410
Gross Unrealized Gains	0
Gross Unrealized Losses	(4,277)
Estimated Fair Value	$ 103,133
Amortized Cost		107,410
Gross Unrealized Gains		0
Gross Unrealized Losses		(8,742)
Estimated Fair Value		98,668
Debt Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost		2,574,943
Gross Unrealized Gains		12,920
Gross Unrealized Losses		(40,825)
Estimated Fair Value		2,547,038
Equity Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost		776
Gross Unrealized Gains		142
Gross Unrealized Losses		0
Estimated Fair Value		$ 918