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Investment Securities - Scheduled Maturities of Investment Securities Available-for-Sale and Held-to-Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Investments Debt And Equity Securities [Abstract] |  |
Available-for-sale, maturing within one year, amortized cost | $ 341 |
Available-for-sale, maturing after one to five years, amortized cost | 17,882 |
Available-for-sale, maturing after five to ten years, amortized cost | 44,274 |
Available-for-sale, maturing after ten years, amortized cost | 31,574 |
Available-for-sale, amortized cost | 94,071 | $ 135,656
Available-for-sale, maturing within one year, estimated fair value | 344 |
Available-for-sale, maturing after one to five years, estimated fair value | 17,881 |
Available-for-sale, maturing after five to ten years, estimated fair value | 44,342 |
Available-for-sale, maturing after ten years, estimated fair value | 31,449 |
Available-for-sale, amortized cost | 94,016 | 132,487
Held-to-maturity, maturing within one year, amortized cost | 60 |
Held-to-maturity, maturing after one to five years, amortized cost | 767 |
Held-to-maturity, maturing after five to ten years, amortized cost | 7,064 |
Held-to-maturity, maturing after ten years, amortized cost | 6,449 |
Held-to-maturity, amortized cost | 14,340 | 21,462
Held-to-maturity, maturing within one year, estimated fair value | 60 |
Held-to-maturity, maturing after one to five years, estimated fair value | 779 |
Held-to-maturity, maturity after five to ten years, estimated fair value | 7,035 |
Held-to-maturity, maturing after ten years, estimated fair value | 6,432 |
Held-to-maturity, amortized cost | $ 14,306 | $ 20,852

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