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Investment Securities - Summary of Contractual Maturities (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020
--- | --- | --- | ---
Securities available for sale |  |  |
Amortized Cost, Due in 1 year or less | $ 2,544 | $ 117 | $ 66
Fair Value (Estimated), Due in 1 year or less | 2,516 | 120 | 66
Amortized Cost, Due in 1 to 5 years | 12,994 | 17,718 | 25,221
Fair Value (Estimated), Due in 1 to 5 years | 13,172 | 17,915 | 26,159
Amortized Cost, Due in 5 to 10 years | 50,007 | 49,697 | 62,462
Fair Value (Estimated), Due in 1 to 5 years | 50,587 | 51,001 | 65,032
Amortized Cost, Due after 10 years | 228,715 | 239,504 | 215,192
Fair Value (Estimated), Due after 10 years | 228,262 | 244,340 | 221,671
Amortized Cost | 294,260 | 307,036 | 302,941
Securities available for sale, Fair Value (Estimated) | 294,537 | 313,376 | 312,928
Securities to be held to maturity |  |  |
Amortized Cost, Due in 1 year or less | 3,926 | 3,607 | 1,331
Fair Value (Estimated), Due in 1 year or less | 3,956 | 3,641 | 1,337
Amortized Cost, Due in 1 to 5 years | 26,992 | 30,867 | 27,854
Fair Value (Estimated), Due in 1 to 5 years | 27,613 | 31,792 | 28,361
Amortized Cost, Due in 5 to 10 years | 173,295 | 183,679 | 184,037
Fair Value (Estimated), Due in 1 to 5 years | 178,069 | 190,153 | 189,214
Amortized Cost, Due after 10 years | 181,139 | 147,460 | 128,370
Fair Value (Estimated), Due after 10 years | 179,198 | 151,548 | 130,336
Amortized Cost | 385,352 | 365,613 | 341,592
Securities to be held to maturity, Fair Value (Estimated) | $ 388,836 | $ 377,134 | $ 349,248

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