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Investment Securities - Amortized Cost and Estimated Fair Value of Available for Sale Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 302,513	$ 355,890	$ 319,088
Unrealized Gains	9,250	5,565	4,275
Unrealized Losses	(263)	(935)	(793)
Fair Value (Estimated)	311,500	360,520	322,570
U.S. Government-sponsored agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	15,500	7,500	5,000
Unrealized Gains	68	0	12
Unrealized Losses	(12)	(102)	0
Fair Value (Estimated)	15,556	7,398	5,012
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	267,805	323,277	309,133
Unrealized Gains	7,937	4,173	4,249
Unrealized Losses	(251)	(833)	(757)
Fair Value (Estimated)	275,491	326,617	312,625
State and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	19,208	25,113	4,955
Unrealized Gains	1,245	1,392	14
Unrealized Losses	0	0	(36)
Fair Value (Estimated)	$ 20,453	$ 26,505	$ 4,933

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- 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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