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Investment Securities - Scheduled Maturities of Investment Securities Available-for-Sale and Held-to-Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Investments Debt And Equity Securities [Abstract] |  |
Available-for-sale, maturing within one year, amortized cost | $ 3,420 |
Available-for-sale, maturing after one to five years, amortized cost | 4,607 |
Available-for-sale, maturing after five to ten years, amortized cost | 43,113 |
Available-for-sale, maturing after ten years, amortized cost | 32,729 |
Available-for-sale, amortized cost | 83,869 | $ 94,071
Available-for-sale, maturing within one year, estimated fair value | 3,438 |
Available-for-sale, maturing after one to five years, estimated fair value | 4,775 |
Available-for-sale, maturing after five to ten years, estimated fair value | 44,432 |
Available-for-sale, maturing after ten years, estimated fair value | 33,037 |
Available-for-sale, amortized cost | 85,682 | 94,016
Held-to-maturity, maturing within one year, amortized cost | 5 |
Held-to-maturity, maturing after one to five years, amortized cost | 765 |
Held-to-maturity, maturing after five to ten years, amortized cost | 3,099 |
Held-to-maturity, maturing after ten years, amortized cost | 3,854 |
Held-to-maturity, amortized cost | 7,723 | 14,340
Held-to-maturity, maturing within one year, estimated fair value | 5 |
Held-to-maturity, maturing after one to five years, estimated fair value | 781 |
Held-to-maturity, maturity after five to ten years, estimated fair value | 3,156 |
Held-to-maturity, maturing after ten years, estimated fair value | 3,932 |
Held-to-maturity, amortized cost | $ 7,874 | $ 14,306

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