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Investment Securities - Summary of Contractual Maturities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Available-for-sale Securities, Debt Maturities [Abstract] |  |
Amortized Cost, Due in 1 year or less | $ 117 | $ 127
Fair Value (Estimated), Due in 1 year or less | 120 | 127
Amortized Cost, Due in 1 to 5 years | 17,718 | 36,534
Fair Value (Estimated), Due in 1 to 5 years | 17,915 | 36,778
Amortized Cost, Due in 5 to 10 years | 49,697 | 93,134
Fair Value (Estimated), Due in 1 to 5 years | 51,001 | 95,014
Amortized Cost, Due after 10 years | 239,504 | 226,095
Fair Value (Estimated), Due after 10 years | 244,340 | 228,601
Securities available-for-sale, Amortized Cost | 307,036 | 355,890
Fair Value (Estimated) | 313,376 | 360,520
Debt Securities, Held-to-maturity, Maturity [Abstract] |  |
Amortized Cost, Due in 1 year or less | 3,607 | 1,334
Fair Value (Estimated), Due in 1 year or less | 3,641 | 1,338
Amortized Cost, Due in 1 to 5 years | 30,867 | 25,860
Fair Value (Estimated), Due in 1 to 5 years | 31,792 | 26,323
Amortized Cost, Due in 5 to 10 years | 183,679 | 179,133
Fair Value (Estimated), Due in 1 to 5 years | 190,153 | 182,834
Amortized Cost, Due after 10 years | 147,460 | 75,279
Fair Value (Estimated), Due after 10 years | 151,548 | 76,550
Amortized Cost | 365,613 | 281,606
Fair Value (Estimated) | $ 377,134 | $ 287,045

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