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Securities, Available-for-sale Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Available-for-sale [Abstract]
Amortized cost	$ 587,314	$ 602,114
Gross unrealized gains	6,780	1,078
Gross unrealized losses	(2,508)	(9,446)
Fair value	591,586	593,746
U.S. Treasury and Government Agencies [Member]
Available-for-sale [Abstract]
Amortized cost	150,573	219,358
Gross unrealized gains	638	48
Gross unrealized losses	(469)	(1,468)
Fair value	150,742	217,938
State and Political Subdivisions [Member]
Available-for-sale [Abstract]
Amortized cost	103,304	126,280
Gross unrealized gains	2,385	633
Gross unrealized losses	(250)	(2,425)
Fair value	105,439	124,488
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]
Available-for-sale [Abstract]
Amortized cost	331,036	255,969
Gross unrealized gains	3,757	397
Gross unrealized losses	(1,788)	(5,547)
Fair value	333,005	250,819
Other Debt Securities [Member]
Available-for-sale [Abstract]
Amortized cost	2,401	507
Gross unrealized gains	0	0
Gross unrealized losses	(1)	(6)
Fair value	$ 2,400	$ 501

X

- Definition

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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