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Investment Securities - Amortized Cost and Estimated Fair Value of Available for Sale Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 333,152	$ 355,890	$ 322,133
Unrealized Gains	8,157	5,565	5,355
Unrealized Losses	(1,169)	(935)	(690)
Fair Value (Estimated)	340,140	360,520	326,798
U.S. Government-sponsored agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	27,545	7,500
Unrealized Gains	180	0
Unrealized Losses	(228)	(102)
Fair Value (Estimated)	27,497	7,398
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	270,336	323,277	317,553
Unrealized Gains	6,737	4,173	5,327
Unrealized Losses	(649)	(833)	(690)
Fair Value (Estimated)	276,424	326,617	322,190
State and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	35,271	25,113	4,580
Unrealized Gains	1,240	1,392	28
Unrealized Losses	(292)	0	0
Fair Value (Estimated)	$ 36,219	$ 26,505	$ 4,608

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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Amount, before tax, of unrealized loss 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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Amount of 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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