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Investment Securities - Available-for-Sale and Held-to-Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule Of Investments [Line Items]
Available-for-sale, amortized cost	$ 68,542	$ 83,289
Available-for-sale, gross unrealized gains	1,653	1,855
Available-for-sale, gross unrealized losses	(91)	(151)
Investment securities available-for-sale, at fair value	70,104	84,993
Held-to-maturity, amortized cost	5,679	6,429
Held-to-maturity, gross unrealized gains	116	130
Held-to-maturity, estimated fair value	5,795	6,559
Corporate Note Securities
Schedule Of Investments [Line Items]
Available-for-sale, amortized cost	2,713	2,711
Available-for-sale, gross unrealized gains	59	73
Investment securities available-for-sale, at fair value	2,772	2,784
Residential Mortgage Backed Securities [Member]
Schedule Of Investments [Line Items]
Available-for-sale, amortized cost	25,801	24,680
Available-for-sale, gross unrealized gains	745	865
Available-for-sale, gross unrealized losses	(5)	(8)
Investment securities available-for-sale, at fair value	26,541	25,537
Commercial Mortgage Backed Securities [Member]
Schedule Of Investments [Line Items]
Available-for-sale, amortized cost	36,217	40,849
Available-for-sale, gross unrealized gains	723	780
Available-for-sale, gross unrealized losses	(85)	(142)
Investment securities available-for-sale, at fair value	36,855	41,487
Held-to-maturity, amortized cost	3,644	4,302
Held-to-maturity, gross unrealized gains	79	75
Held-to-maturity, estimated fair value	3,723	4,377
US States and Political Subdivisions Debt Securities [Member]
Schedule Of Investments [Line Items]
Available-for-sale, amortized cost	3,729	4,971
Available-for-sale, gross unrealized gains	126	137
Investment securities available-for-sale, at fair value	3,855	5,108
Held-to-maturity, amortized cost	981	1,007
Held-to-maturity, gross unrealized gains	16	21
Held-to-maturity, estimated fair value	997	1,028
US Treasury Securities [Member]
Schedule Of Investments [Line Items]
Available-for-sale, amortized cost	82	10,078
Available-for-sale, gross unrealized losses	(1)	(1)
Investment securities available-for-sale, at fair value	81	10,077
US Government Agencies Debt Securities [Member]
Schedule Of Investments [Line Items]
Held-to-maturity, amortized cost	1,054	1,120
Held-to-maturity, gross unrealized gains	21	34
Held-to-maturity, estimated fair value	$ 1,075	$ 1,154

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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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