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Investment Securities - Available-for-Sale and Held-to-Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Schedule Of Investments [Line Items]
Available-for-sale, amortized cost	$ 95,768	$ 94,071
Available-for-sale, gross unrealized gains	1,048	540
Available-for-sale, gross unrealized losses	(275)	(595)
Investment securities available-for-sale, at fair value	96,541	94,016
Held-to-maturity, amortized cost	13,538	14,340
Held-to-maturity, gross unrealized gains	123	22
Held-to-maturity, gross unrealized losses	(16)	(56)
Held-to-maturity, estimated fair value	13,645	14,306
Residential Mortgage Backed Securities [Member]
Schedule Of Investments [Line Items]
Available-for-sale, amortized cost	42,525	46,182
Available-for-sale, gross unrealized gains	589	372
Available-for-sale, gross unrealized losses	(12)	(209)
Investment securities available-for-sale, at fair value	43,102	46,345
Commercial Mortgage Backed Securities [Member]
Schedule Of Investments [Line Items]
Available-for-sale, amortized cost	48,624	43,686
Available-for-sale, gross unrealized gains	379	73
Available-for-sale, gross unrealized losses	(263)	(386)
Investment securities available-for-sale, at fair value	48,740	43,373
Held-to-maturity, amortized cost	8,158	8,923
Held-to-maturity, gross unrealized gains	89	2
Held-to-maturity, gross unrealized losses		(46)
Held-to-maturity, estimated fair value	8,247	8,879
US States and Political Subdivisions Debt Securities [Member]
Schedule Of Investments [Line Items]
Available-for-sale, amortized cost	3,872	4,123
Available-for-sale, gross unrealized gains	80	95
Investment securities available-for-sale, at fair value	3,952	4,218
Held-to-maturity, amortized cost	1,071	1,093
Held-to-maturity, gross unrealized gains		15
Held-to-maturity, gross unrealized losses	(16)
Held-to-maturity, estimated fair value	1,055	1,108
Corporate Notes [Member]
Schedule Of Investments [Line Items]
Available-for-sale, amortized cost	666
Investment securities available-for-sale, at fair value	666
US Treasury Securities [Member]
Schedule Of Investments [Line Items]
Available-for-sale, amortized cost	81	80
Investment securities available-for-sale, at fair value	81	80
US Government Agencies Debt Securities [Member]
Schedule Of Investments [Line Items]
Held-to-maturity, amortized cost	4,309	4,324
Held-to-maturity, gross unrealized gains	34	5
Held-to-maturity, gross unrealized losses		(10)
Held-to-maturity, estimated fair value	$ 4,343	$ 4,319

X

- Definition

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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