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Investment Securities - Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Schedule Of Investments [Line Items] |  |
Available-for-sale, less than 12 months, fair value | $ 15,041 | $ 21,214
Available-for-sale, less than 12 months, unrealized losses | (3) | (91)
Available-for-sale, 12 months or more, fair value | 4,346 | 39,848
Available-for-sale, 12 months or more, unrealized losses | (148) | (504)
Held-to-maturity, less than 12 months, fair value | 412 | 1,531
Held-to-maturity, less than 12 months, unrealized losses |  | (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 | 2,334 | 17,340
Available-for-sale, less than 12 months, unrealized losses | (1) | (66)
Available-for-sale, 12 months or more, fair value | 1,019 | 10,094
Available-for-sale, 12 months or more, unrealized losses | (7) | (143)
Commercial Mortgage Backed Securities [Member] |  |
Schedule Of Investments [Line Items] |  |
Available-for-sale, less than 12 months, fair value | 2,630 | 3,794
Available-for-sale, less than 12 months, unrealized losses | (1) | (25)
Available-for-sale, 12 months or more, fair value | 3,327 | 29,754
Available-for-sale, 12 months or more, unrealized losses | (141) | (361)
Held-to-maturity, less than 12 months, fair value | 412 | 685
Held-to-maturity, 12 months or more, fair value |  | 6,405
Held-to-maturity, 12 months or more, unrealized losses |  | (46)
US Treasury Securities [Member] |  |
Schedule Of Investments [Line Items] |  |
Available-for-sale, less than 12 months, fair value | 10,077 | 80
Available-for-sale, less than 12 months, unrealized losses | $ (1) |
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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