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Investment Securities - Available-for-Sale and Held-to-Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Schedule Of Investments [Line Items]
Available-for-sale, amortized cost	$ 96,882	$ 135,656
Available-for-sale, gross unrealized gains	473	174
Available-for-sale, gross unrealized losses	(805)	(3,343)
Investment securities available-for-sale, at fair value	96,550	132,487
Held-to-maturity, amortized cost	17,759	21,462
Held-to-maturity, gross unrealized gains	14
Held-to-maturity, gross unrealized losses	(112)	(610)
Held-to-maturity, estimated fair value	17,661	20,852
Residential Mortgage Backed Securities [Member]
Schedule Of Investments [Line Items]
Available-for-sale, amortized cost	47,107	73,859
Available-for-sale, gross unrealized gains	321	113
Available-for-sale, gross unrealized losses	(320)	(1,517)
Investment securities available-for-sale, at fair value	47,108	72,455
Commercial Mortgage Backed Securities [Member]
Schedule Of Investments [Line Items]
Available-for-sale, amortized cost	45,496	56,101
Available-for-sale, gross unrealized gains	46	10
Available-for-sale, gross unrealized losses	(485)	(1,822)
Investment securities available-for-sale, at fair value	45,057	54,289
Held-to-maturity, amortized cost	9,722	11,716
Held-to-maturity, gross unrealized gains	1
Held-to-maturity, gross unrealized losses	(83)	(349)
Held-to-maturity, estimated fair value	9,640	11,367
US States and Political Subdivisions Debt Securities [Member]
Schedule Of Investments [Line Items]
Available-for-sale, amortized cost	4,199	5,617
Available-for-sale, gross unrealized gains	106	51
Available-for-sale, gross unrealized losses		(4)
Investment securities available-for-sale, at fair value	4,305	5,664
Held-to-maturity, amortized cost	1,627	1,720
Held-to-maturity, gross unrealized gains	13
Held-to-maturity, gross unrealized losses		(17)
Held-to-maturity, estimated fair value	1,640	1,703
US Treasury Securities [Member]
Schedule Of Investments [Line Items]
Available-for-sale, amortized cost	80	79
Investment securities available-for-sale, at fair value	80	79
US Government Agencies Debt Securities [Member]
Schedule Of Investments [Line Items]
Held-to-maturity, amortized cost	6,410	8,026
Held-to-maturity, gross unrealized losses	(29)	(244)
Held-to-maturity, estimated fair value	$ 6,381	$ 7,782

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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