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Investment Securities - Summary of Amortized Cost and Estimated Fair Value, AFS (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 307,036	$ 355,890
Unrealized Gains	7,272	5,565
Unrealized Losses	(932)	(935)
Fair Value (Estimated)	313,376	360,520
U.S. government-sponsored agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	23,045	7,500
Unrealized Gains	0	0
Unrealized Losses	(315)	(102)
Fair Value (Estimated)	22,730	7,398
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	238,516	323,277
Unrealized Gains	5,507	4,173
Unrealized Losses	(617)	(833)
Fair Value (Estimated)	243,406	326,617
State and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	37,752	25,113
Unrealized Gains	1,722	1,392
Unrealized Losses	0	0
Fair Value (Estimated)	39,474	$ 26,505
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	7,723
Unrealized Gains	43
Unrealized Losses	0
Fair Value (Estimated)	$ 7,766

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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