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Investment Securities - Scheduled Maturities of Investment Securities Available-for-Sale and Held-to-Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Investments Debt And Equity Securities [Abstract] |  |
Available-for-sale, maturing within one year, amortized cost | $ 89 |
Available-for-sale, maturing after one to five years, amortized cost | 6,759 |
Available-for-sale, maturing after five to ten years, amortized cost | 32,638 |
Available-for-sale, maturing after ten years, amortized cost | 29,056 |
Available-for-sale, amortized cost | 68,542 | $ 83,289
Available-for-sale, maturing within one year, estimated fair value | 89 |
Available-for-sale, maturing after one to five years, estimated fair value | 6,943 |
Available-for-sale, maturing after five to ten years, estimated fair value | 33,636 |
Available-for-sale, maturing after ten years, estimated fair value | 29,436 |
Available-for-sale, amortized cost | 70,104 | 84,993
Held-to-maturity, maturing within one year, amortized cost | 402 |
Held-to-maturity, maturing after one to five years, amortized cost | 360 |
Held-to-maturity, maturing after five to ten years, amortized cost | 2,391 |
Held-to-maturity, maturing after ten years, amortized cost | 2,526 |
Held-to-maturity, amortized cost | 5,679 | 6,429
Held-to-maturity, maturing within one year, estimated fair value | 409 |
Held-to-maturity, maturing after one to five years, estimated fair value | 363 |
Held-to-maturity, maturity after five to ten years, estimated fair value | 2,450 |
Held-to-maturity, maturing after ten years, estimated fair value | 2,573 |
Held-to-maturity, amortized cost | $ 5,795 | $ 6,559

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