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Investment Securities - Scheduled Maturities of Investment Securities Available-for-Sale and Held-to-Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Investments Debt And Equity Securities [Abstract] |  |
Available-for-sale, maturing within one year, amortized cost | $ 11,324 |
Available-for-sale, maturing after one to five years, amortized cost | 4,216 |
Available-for-sale, maturing after five to ten years, amortized cost | 39,030 |
Available-for-sale, maturing after ten years, amortized cost | 28,719 |
Available-for-sale, amortized cost | 83,289 | $ 94,071
Available-for-sale, maturing within one year, estimated fair value | 11,330 |
Available-for-sale, maturing after one to five years, estimated fair value | 4,372 |
Available-for-sale, maturing after five to ten years, estimated fair value | 40,211 |
Available-for-sale, maturing after ten years, estimated fair value | 29,080 |
Available-for-sale, amortized cost | 84,993 | 94,016
Held-to-maturity, maturing after one to five years, amortized cost | 763 |
Held-to-maturity, maturing after five to ten years, amortized cost | 2,716 |
Held-to-maturity, maturing after ten years, amortized cost | 2,950 |
Held-to-maturity, amortized cost | 6,429 | 14,340
Held-to-maturity, maturing after one to five years, estimated fair value | 777 |
Held-to-maturity, maturity after five to ten years, estimated fair value | 2,770 |
Held-to-maturity, maturing after ten years, estimated fair value | 3,012 |
Held-to-maturity, amortized cost | $ 6,559 | $ 14,306

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