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Securities - Schedule of Available-for-Sales Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,190,869	$ 1,363,902
Gross Unrealized Gains	6,149	898
Gross Unrealized Losses	7,772	32,142
Fair Value	1,189,246	1,332,658
U.S. Treasuries
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	280	289
Gross Unrealized Gains	0	0
Gross Unrealized Losses	2	0
Fair Value	278	289
Obligations of U.S. Government sponsored entities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	348,360	493,371
Gross Unrealized Gains	1,562	80
Gross Unrealized Losses	260	7,553
Fair Value	349,662	485,898
Obligations of U.S. states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	79,891	86,260
Gross Unrealized Gains	927	113
Gross Unrealized Losses	35	933
Fair Value	80,783	85,440
U.S. Government agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	169,799	131,831
Gross Unrealized Gains	1,289	168
Gross Unrealized Losses	1,533	3,732
Fair Value	169,555	128,267
U.S. Government sponsored entities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	590,032	649,620
Gross Unrealized Gains	2,371	537
Gross Unrealized Losses	5,874	19,599
Fair Value	586,529	630,558
Non-U.S. Government agencies or sponsored entities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	7	31
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	7	31
U.S. corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,500	2,500
Gross Unrealized Gains	0	0
Gross Unrealized Losses	68	325
Fair Value	$ 2,432	$ 2,175

X

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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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