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Securities - Schedule of Available-for-Sales Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,360,508	$ 1,408,996
Gross Unrealized Gains	381
Gross Unrealized Losses	50,217
Fair Value	1,310,672	1,391,863
Amortized Cost		1,409,996
Gross Unrealized Gains		2,263
Gross Unrealized Losses		19,484
Available-for-sale securities, at fair value		1,392,775
Obligations of U.S. Government sponsored entities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	498,837
Gross Unrealized Gains	0
Gross Unrealized Losses	13,104
Fair Value	485,733
Amortized Cost		507,248
Gross Unrealized Gains		278
Gross Unrealized Losses		3,333
Available-for-sale securities, at fair value		504,193
Obligations of U.S. states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	86,517
Gross Unrealized Gains	33
Gross Unrealized Losses	1,788
Fair Value	84,762
Amortized Cost		91,659
Gross Unrealized Gains		281
Gross Unrealized Losses		421
Available-for-sale securities, at fair value		91,519
U.S. Government agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	114,417
Gross Unrealized Gains	143
Gross Unrealized Losses	5,404
Fair Value	109,156
Amortized Cost		139,747
Gross Unrealized Gains		659
Gross Unrealized Losses		2,671
Available-for-sale securities, at fair value		137,735
U.S. Government sponsored entities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	658,195
Gross Unrealized Gains	205
Gross Unrealized Losses	29,596
Fair Value	628,804
Amortized Cost		667,767
Gross Unrealized Gains		1,045
Gross Unrealized Losses		12,634
Available-for-sale securities, at fair value		656,178
Non-U.S. Government agencies or sponsored entities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	42
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Value	42
Amortized Cost		75
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Available-for-sale securities, at fair value		75
U.S. corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,500
Gross Unrealized Gains	0
Gross Unrealized Losses	325
Fair Value	2,175
Amortized Cost		2,500
Gross Unrealized Gains		0
Gross Unrealized Losses		338
Available-for-sale securities, at fair value		2,162
Total available-for-sale securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	587,854	601,407
Fair Value	$ 572,670	597,875
Amortized Cost		1,408,996
Gross Unrealized Gains		2,263
Gross Unrealized Losses		19,397
Available-for-sale securities, at fair value		1,391,862
Equity securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		1,000
Gross Unrealized Gains		0
Gross Unrealized Losses		87
Available-for-sale securities, at fair value		$ 913

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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