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Securities, Available-for-Sale Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Available-for-sale [Abstract]
Amortized cost	$ 593,945	$ 602,114
Gross unrealized gains	7,860	1,078
Gross unrealized losses	(1,961)	(9,446)
Fair value	599,844	593,746
U.S. Treasury and Government Agencies [Member]
Available-for-sale [Abstract]
Amortized cost	171,250	219,358
Gross unrealized gains	476	48
Gross unrealized losses	(576)	(1,468)
Fair value	171,150	217,938
State and Political Subdivisions [Member]
Available-for-sale [Abstract]
Amortized cost	99,403	126,280
Gross unrealized gains	2,941	633
Gross unrealized losses	(37)	(2,425)
Fair value	102,307	124,488
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]
Available-for-sale [Abstract]
Amortized cost	291,874	255,969
Gross unrealized gains	4,443	397
Gross unrealized losses	(1,072)	(5,547)
Fair value	295,245	250,819
Other Debt Securities [Member]
Available-for-sale [Abstract]
Amortized cost	31,418	507
Gross unrealized gains	0	0
Gross unrealized losses	(276)	(6)
Fair value	$ 31,142	$ 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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