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Securities - Schedule of Available-for-Sales Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,140,086	$ 1,363,902
Gross Unrealized Gains	7,540	898
Gross Unrealized Losses	5,174	32,142
Fair Value	1,142,452	1,332,658
U.S. Treasuries
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,356	289
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	1,356	289
Obligations of U.S. Government sponsored entities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	314,740	493,371
Gross Unrealized Gains	2,039	80
Gross Unrealized Losses	63	7,553
Fair Value	316,716	485,898
Obligations of U.S. states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	84,744	86,260
Gross Unrealized Gains	1,152	113
Gross Unrealized Losses	60	933
Fair Value	85,836	85,440
U.S. Government agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	176,737	131,831
Gross Unrealized Gains	1,429	168
Gross Unrealized Losses	1,319	3,732
Fair Value	176,847	128,267
U.S. Government sponsored entities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	560,009	649,620
Gross Unrealized Gains	2,920	537
Gross Unrealized Losses	3,664	19,599
Fair Value	559,265	630,558
Non-U.S. Government agencies or sponsored entities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		31
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Fair Value		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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