Investment Securities - Amortized Cost, Securities Available for Sale (Details) $ in Thousands	Jun. 30, 2018 USD ($) Security	Dec. 31, 2017 USD ($)
Schedule of Available-for-sale Securities
Amortized Cost	$ 1,888,953	$ 1,511,034
Gross Unrealized Gains	1,916	5,029
Gross Unrealized Losses	(57,402)	(22,158)
Fair Value	1,833,467	1,493,905
U.S. Treasury securities
Schedule of Available-for-sale Securities
Amortized Cost	50,986	50,997
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(2,319)	(1,355)
Fair Value	48,667	49,642
U.S. government agency securities
Schedule of Available-for-sale Securities
Amortized Cost	39,212	42,384
Gross Unrealized Gains	34	158
Gross Unrealized Losses	(1,240)	(37)
Fair Value	38,006	42,505
Obligations of states and state agencies
Schedule of Available-for-sale Securities
Amortized Cost	110,580	38,435
Gross Unrealized Gains	52	158
Gross Unrealized Losses	(2,636)	(374)
Fair Value	107,996	38,219
Municipal bonds
Schedule of Available-for-sale Securities
Amortized Cost	104,922	74,752
Gross Unrealized Gains	281	477
Gross Unrealized Losses	(1,670)	(564)
Fair Value	103,533	74,665
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities
Amortized Cost	215,502	113,187
Gross Unrealized Gains	333	635
Gross Unrealized Losses	(4,306)	(938)
Fair Value	211,529	112,884
Residential mortgage-backed securities
Schedule of Available-for-sale Securities
Amortized Cost	1,525,041	1,239,534
Gross Unrealized Gains	1,330	2,423
Gross Unrealized Losses	(48,525)	(18,662)
Fair Value	1,477,846	1,223,295
Trust preferred securities
Schedule of Available-for-sale Securities
Amortized Cost	2,583	3,726
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(304)	(512)
Fair Value	2,279	3,214
Corporate and other debt securities
Schedule of Available-for-sale Securities
Amortized Cost	55,629	50,701
Gross Unrealized Gains	219	623
Gross Unrealized Losses	(708)	(160)
Fair Value	$ 55,140	51,164
Equity securities
Schedule of Available-for-sale Securities
Amortized Cost		10,505
Gross Unrealized Gains		1,190
Gross Unrealized Losses		(494)
Fair Value		$ 11,201
Pooled Trust Preferred Securities
Schedule of Available-for-sale Securities
Available-For-Sale Securities, Number Of Securities \| Security	1

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-Publisher FASB
-Name Accounting Standards Codification
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