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Investment Securities - Amortized Cost and Estimated Fair Value of Available for Sale Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 302,941	$ 355,890	$ 327,224
Unrealized Gains	10,176	5,565	1,414
Unrealized Losses	(189)	(935)	(3,362)
Fair Value (Estimated)	312,928	360,520	325,276
U.S. Government-sponsored agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	7,500	7,500	5,000
Unrealized Gains	52	0	16
Unrealized Losses	0	(102)	0
Fair Value (Estimated)	7,552	7,398	5,016
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	276,235	323,277	317,269
Unrealized Gains	9,106	4,173	1,394
Unrealized Losses	(189)	(833)	(3,240)
Fair Value (Estimated)	285,152	326,617	315,423
State and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	19,206	25,113	4,955
Unrealized Gains	1,018	1,392	4
Unrealized Losses	0	0	(122)
Fair Value (Estimated)	$ 20,224	$ 26,505	$ 4,837

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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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