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Investment Securities - Summary of Amortized Cost and Estimated Fair Value, AFS (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 294,260	$ 307,036	$ 302,941
Unrealized Gains	5,404	7,272	10,176
Unrealized Losses	(5,127)	(932)	(189)
Fair Value (Estimated)	294,537	313,376	312,928
U.S. Government-sponsored agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	23,045	23,045	7,500
Unrealized Gains	0	0	52
Unrealized Losses	(1,560)	(315)	0
Fair Value (Estimated)	21,485	22,730	7,552
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	227,089	238,516	276,235
Unrealized Gains	4,109	5,507	9,106
Unrealized Losses	(3,284)	(617)	(189)
Fair Value (Estimated)	227,914	243,406	285,152
State and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	36,663	37,752	19,206
Unrealized Gains	1,178	1,722	1,018
Unrealized Losses	(283)	0	0
Fair Value (Estimated)	37,558	39,474	$ 20,224
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	7,463	7,723
Unrealized Gains	117	43
Unrealized Losses	0	0
Fair Value (Estimated)	$ 7,580	$ 7,766

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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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