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Investment Securities - Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Schedule Of Investments [Line Items]
Available-for-sale, less than 12 months, fair value	$ 8,388	$ 21,214
Available-for-sale, less than 12 months, unrealized losses	(2)	(91)
Available-for-sale, 12 months or more, fair value	9,566	39,848
Available-for-sale, 12 months or more, unrealized losses	(273)	(504)
Held-to-maturity, less than 12 months, fair value	750	1,531
Held-to-maturity, less than 12 months, unrealized losses	(16)	(4)
Held-to-maturity, 12 months or more, fair value		9,399
Held-to-maturity, 12 months or more, unrealized losses		(52)
Residential Mortgage Backed Securities [Member]
Schedule Of Investments [Line Items]
Available-for-sale, less than 12 months, fair value	576	17,340
Available-for-sale, less than 12 months, unrealized losses	(2)	(66)
Available-for-sale, 12 months or more, fair value	4,865	10,094
Available-for-sale, 12 months or more, unrealized losses	(10)	(143)
Commercial Mortgage Backed Securities [Member]
Schedule Of Investments [Line Items]
Available-for-sale, less than 12 months, fair value	7,066	3,794
Available-for-sale, less than 12 months, unrealized losses		(25)
Available-for-sale, 12 months or more, fair value	4,701	29,754
Available-for-sale, 12 months or more, unrealized losses	(263)	(361)
Held-to-maturity, less than 12 months, fair value		685
Held-to-maturity, 12 months or more, fair value		6,405
Held-to-maturity, 12 months or more, unrealized losses		(46)
Corporate Notes [Member]
Schedule Of Investments [Line Items]
Available-for-sale, less than 12 months, fair value	666
US Treasury Securities [Member]
Schedule Of Investments [Line Items]
Available-for-sale, less than 12 months, fair value	80	80
US States and Political Subdivisions Debt Securities [Member]
Schedule Of Investments [Line Items]
Held-to-maturity, less than 12 months, fair value	750
Held-to-maturity, less than 12 months, unrealized losses	$ (16)
US Government Agencies Debt Securities [Member]
Schedule Of Investments [Line Items]
Held-to-maturity, less than 12 months, fair value		846
Held-to-maturity, less than 12 months, unrealized losses		(4)
Held-to-maturity, 12 months or more, fair value		2,994
Held-to-maturity, 12 months or more, unrealized losses		$ (6)

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