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Securities, Available-for-sale Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Available-for-sale [Abstract]
Amortized cost	$ 725,392	$ 593,945
Gross unrealized gains	17,325	7,860
Gross unrealized losses	(2,238)	(1,961)
Fair value	740,479	599,844
U.S. Treasury and Government Agencies [Member]
Available-for-sale [Abstract]
Amortized cost	89,335	171,250
Gross unrealized gains	550	476
Gross unrealized losses	(453)	(576)
Fair value	89,432	171,150
State and Political Subdivisions [Member]
Available-for-sale [Abstract]
Amortized cost	120,194	99,403
Gross unrealized gains	5,752	2,941
Gross unrealized losses	(28)	(37)
Fair value	125,918	102,307
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]
Available-for-sale [Abstract]
Amortized cost	459,327	291,874
Gross unrealized gains	11,023	4,443
Gross unrealized losses	(395)	(1,072)
Fair value	469,955	295,245
Other Debt Securities [Member]
Available-for-sale [Abstract]
Amortized cost	56,536	31,418
Gross unrealized gains	0	0
Gross unrealized losses	(1,362)	(276)
Fair value	$ 55,174	$ 31,142

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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