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Investment Securities - Available-for-Sale and Held-to-Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Schedule Of Investments [Line Items]
Available-for-sale, amortized cost	$ 83,869	$ 94,071
Available-for-sale, gross unrealized gains	2,061	540
Available-for-sale, gross unrealized losses	(248)	(595)
Investment securities available-for-sale, at fair value	85,682	94,016
Held-to-maturity, amortized cost	7,723	14,340
Held-to-maturity, gross unrealized gains	153	22
Held-to-maturity, gross unrealized losses	(2)	(56)
Held-to-maturity, estimated fair value	7,874	14,306
Residential Mortgage Backed Securities [Member]
Schedule Of Investments [Line Items]
Available-for-sale, amortized cost	29,036	46,182
Available-for-sale, gross unrealized gains	978	372
Available-for-sale, gross unrealized losses	(7)	(209)
Investment securities available-for-sale, at fair value	30,007	46,345
Commercial Mortgage Backed Securities [Member]
Schedule Of Investments [Line Items]
Available-for-sale, amortized cost	46,251	43,686
Available-for-sale, gross unrealized gains	888	73
Available-for-sale, gross unrealized losses	(239)	(386)
Investment securities available-for-sale, at fair value	46,900	43,373
Held-to-maturity, amortized cost	5,510	8,923
Held-to-maturity, gross unrealized gains	88	2
Held-to-maturity, gross unrealized losses	(2)	(46)
Held-to-maturity, estimated fair value	5,596	8,879
US States and Political Subdivisions Debt Securities [Member]
Schedule Of Investments [Line Items]
Available-for-sale, amortized cost	5,793	4,123
Available-for-sale, gross unrealized gains	118	95
Available-for-sale, gross unrealized losses	(2)
Investment securities available-for-sale, at fair value	5,909	4,218
Held-to-maturity, amortized cost	1,024	1,093
Held-to-maturity, gross unrealized gains	26	15
Held-to-maturity, estimated fair value	1,050	1,108
Corporate Notes [Member]
Schedule Of Investments [Line Items]
Available-for-sale, amortized cost	2,709
Available-for-sale, gross unrealized gains	77
Investment securities available-for-sale, at fair value	2,786
US Treasury Securities [Member]
Schedule Of Investments [Line Items]
Available-for-sale, amortized cost	80	80
Investment securities available-for-sale, at fair value	80	80
US Government Agencies Debt Securities [Member]
Schedule Of Investments [Line Items]
Held-to-maturity, amortized cost	1,189	4,324
Held-to-maturity, gross unrealized gains	39	5
Held-to-maturity, gross unrealized losses		(10)
Held-to-maturity, estimated fair value	$ 1,228	$ 4,319

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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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