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Investment Securities - Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Schedule Of Investments [Line Items]
Available-for-sale, less than 12 months, fair value	$ 7,564	$ 15,041
Available-for-sale, less than 12 months, unrealized losses	(7)	(3)
Available-for-sale, 12 months or more, fair value	3,788	4,346
Available-for-sale, 12 months or more, unrealized losses	(166)	(148)
Held-to-maturity, less than 12 months, fair value		412
Residential Mortgage Backed Securities [Member]
Schedule Of Investments [Line Items]
Available-for-sale, less than 12 months, fair value	30	2,334
Available-for-sale, less than 12 months, unrealized losses		(1)
Available-for-sale, 12 months or more, fair value	814	1,019
Available-for-sale, 12 months or more, unrealized losses	(5)	(7)
Commercial Mortgage Backed Securities [Member]
Schedule Of Investments [Line Items]
Available-for-sale, less than 12 months, fair value	39	2,630
Available-for-sale, less than 12 months, unrealized losses		(1)
Available-for-sale, 12 months or more, fair value	2,974	3,327
Available-for-sale, 12 months or more, unrealized losses	(161)	(141)
Held-to-maturity, less than 12 months, fair value		412
US States and Political Subdivisions Debt Securities [Member]
Schedule Of Investments [Line Items]
Available-for-sale, less than 12 months, fair value	570
Available-for-sale, less than 12 months, unrealized losses	(2)
Corporate Notes [Member]
Schedule Of Investments [Line Items]
Available-for-sale, less than 12 months, fair value	1,998
Available-for-sale, less than 12 months, unrealized losses	(2)
US Treasury Securities [Member]
Schedule Of Investments [Line Items]
Available-for-sale, less than 12 months, fair value	4,927	10,077
Available-for-sale, less than 12 months, unrealized losses	$ (3)	$ (1)

X

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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