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Investment Securities - Summary of Contractual Maturities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020
--- | --- | --- | ---
Securities available for sale |  |  |
Amortized Cost, Due in 1 year or less | $ 0 | $ 117 | $ 7,097
Fair Value (Estimated), Due in 1 year or less | 0 | 120 | 7,159
Amortized Cost, Due in 1 to 5 years | 6,285 | 17,718 | 23,789
Fair Value (Estimated), Due in 1 to 5 years | 6,529 | 17,915 | 24,260
Amortized Cost, Due in 5 to 10 years | 37,971 | 49,697 | 58,430
Fair Value (Estimated), Due in 1 to 5 years | 38,400 | 51,001 | 60,086
Amortized Cost, Due after 10 years | 265,762 | 239,504 | 243,836
Fair Value (Estimated), Due after 10 years | 264,295 | 244,340 | 248,635
Fair Value (Estimated) | 309,224 | 313,376 | 340,140
Amortized Cost | 310,018 | 307,036 | 333,152
Securities to be held to maturity |  |  |
Amortized Cost, Due in 1 year or less | 3,788 | 3,607 | 2,454
Fair Value (Estimated), Due in 1 year or less | 3,763 | 3,641 | 2,462
Amortized Cost, Due in 1 to 5 years | 18,616 | 30,867 | 32,595
Fair Value (Estimated), Due in 1 to 5 years | 19,426 | 31,792 | 33,683
Amortized Cost, Due in 5 to 10 years | 171,039 | 183,679 | 176,400
Fair Value (Estimated), Due in 1 to 5 years | 176,007 | 190,153 | 182,370
Amortized Cost, Due after 10 years | 182,256 | 147,460 | 120,513
Fair Value (Estimated), Due after 10 years | 180,601 | 151,548 | 123,547
Amortized Cost | 375,699 | 365,613 | 331,962
Securities to be held to maturity, Fair Value (Estimated) | $ 379,797 | $ 377,134 | $ 342,062

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