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Investment Securities - Securities in Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Schedule Of Investments [Line Items]    
Available-for-sale, less than 12 months, fair value $ 277 $ 15,041
Available-for-sale, less than 12 months, unrealized losses (1) (3)
Available-for-sale, 12 months or more, fair value 4,234 4,346
Available-for-sale, 12 months or more, unrealized losses (90) (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 196 2,334
Available-for-sale, less than 12 months, unrealized losses   (1)
Available-for-sale, 12 months or more, fair value 952 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   2,630
Available-for-sale, less than 12 months, unrealized losses   (1)
Available-for-sale, 12 months or more, fair value 3,282 3,327
Available-for-sale, 12 months or more, unrealized losses (85) (141)
Held-to-maturity, less than 12 months, fair value   412
US Treasury Securities [Member]    
Schedule Of Investments [Line Items]    
Available-for-sale, less than 12 months, fair value 81 10,077
Available-for-sale, less than 12 months, unrealized losses $ (1) $ (1)