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Investment Securities - Available-for-Sale and Held-to-Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Schedule Of Investments [Line Items]
Available-for-sale, amortized cost	$ 116,041	$ 83,289
Available-for-sale, gross unrealized gains	1,692	1,855
Available-for-sale, gross unrealized losses	(173)	(151)
Investment securities available-for-sale, at fair value	117,560	84,993
Held-to-maturity, amortized cost	3,907	6,429
Held-to-maturity, gross unrealized gains	85	130
Held-to-maturity, estimated fair value	3,992	6,559
Residential Mortgage Backed Securities [Member]
Schedule Of Investments [Line Items]
Available-for-sale, amortized cost	44,271	24,680
Available-for-sale, gross unrealized gains	800	865
Available-for-sale, gross unrealized losses	(5)	(8)
Investment securities available-for-sale, at fair value	45,066	25,537
Commercial Mortgage Backed Securities [Member]
Schedule Of Investments [Line Items]
Available-for-sale, amortized cost	27,991	40,849
Available-for-sale, gross unrealized gains	551	780
Available-for-sale, gross unrealized losses	(161)	(142)
Investment securities available-for-sale, at fair value	28,381	41,487
Held-to-maturity, amortized cost	2,416	4,302
Held-to-maturity, gross unrealized gains	50	75
Held-to-maturity, estimated fair value	2,466	4,377
US States and Political Subdivisions Debt Securities [Member]
Schedule Of Investments [Line Items]
Available-for-sale, amortized cost	4,266	4,971
Available-for-sale, gross unrealized gains	108	137
Available-for-sale, gross unrealized losses	(2)
Investment securities available-for-sale, at fair value	4,372	5,108
Held-to-maturity, amortized cost	574	1,007
Held-to-maturity, gross unrealized gains	5	21
Held-to-maturity, estimated fair value	579	1,028
Corporate Notes [Member]
Schedule Of Investments [Line Items]
Available-for-sale, amortized cost	9,318	2,711
Available-for-sale, gross unrealized gains	94	73
Available-for-sale, gross unrealized losses	(2)
Investment securities available-for-sale, at fair value	9,410	2,784
US Treasury Securities [Member]
Schedule Of Investments [Line Items]
Available-for-sale, amortized cost	30,195	10,078
Available-for-sale, gross unrealized gains	139
Available-for-sale, gross unrealized losses	(3)	(1)
Investment securities available-for-sale, at fair value	30,331	10,077
US Government Agencies Debt Securities [Member]
Schedule Of Investments [Line Items]
Held-to-maturity, amortized cost	917	1,120
Held-to-maturity, gross unrealized gains	30	34
Held-to-maturity, estimated fair value	$ 947	$ 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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