Investment Securities - Amortized Cost and Market Value of Securities Available for Sale (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Investment Securities
Amortized Cost	$ 136,776,000	$ 112,354,000
Gross Unrealized Gains	1,339,000	2,031,000
Gross Unrealized Losses	(3,218,000)	(336,000)
Fair Value	134,897,000	114,049,000
Trading securities	0	0
Held to maturity	0	0
Collateralized mortgage obligations
Investment Securities
Amortized Cost	26,747,000	24,261,000
Gross Unrealized Gains	349,000	396,000
Gross Unrealized Losses	(76,000)	(14,000)
Fair Value	27,020,000	24,643,000
Agency mortgage-backed securities
Investment Securities
Amortized Cost	34,993,000	26,072,000
Gross Unrealized Gains	606,000	886,000
Gross Unrealized Losses	(329,000)	(10,000)
Fair Value	35,270,000	26,948,000
Municipal securities
Investment Securities
Amortized Cost	30,962,000	28,675,000
Gross Unrealized Gains	384,000	740,000
Gross Unrealized Losses	(349,000)	(2,000)
Fair Value	30,997,000	29,413,000
U.S. Government agency securities
Investment Securities
Amortized Cost	44,074,000	33,346,000
Gross Unrealized Gains		9,000
Gross Unrealized Losses	(2,464,000)	(310,000)
Fair Value	$ 41,610,000	$ 33,045,000

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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Amortized cost 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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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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Amount of investment in debt security measured at amortized cost (held-to-maturity).

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Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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