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Securities, Available-for-sale Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Available-for-sale [Abstract]
Amortized cost	$ 643,164	$ 602,114
Gross unrealized gains	8,562	1,078
Gross unrealized losses	(1,750)	(9,446)
Fair value	649,976	593,746
U.S. Treasury and Government Agencies [Member]
Available-for-sale [Abstract]
Amortized cost	193,376	219,358
Gross unrealized gains	610	48
Gross unrealized losses	(619)	(1,468)
Fair value	193,367	217,938
State and Political Subdivisions [Member]
Available-for-sale [Abstract]
Amortized cost	101,593	126,280
Gross unrealized gains	3,146	633
Gross unrealized losses	(37)	(2,425)
Fair value	104,702	124,488
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]
Available-for-sale [Abstract]
Amortized cost	316,745	255,969
Gross unrealized gains	4,806	397
Gross unrealized losses	(1,088)	(5,547)
Fair value	320,463	250,819
Other Debt Securities [Member]
Available-for-sale [Abstract]
Amortized cost	31,450	507
Gross unrealized gains	0	0
Gross unrealized losses	(6)	(6)
Fair value	$ 31,444	$ 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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