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Investment Securities - Scheduled Maturities of Investment Securities Available-for-Sale and Held-to-Maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Investments Debt And Equity Securities [Abstract] |  |
Available-for-sale, maturing within one year, amortized cost | $ 84 |
Available-for-sale, maturing after one to five years, amortized cost | 21,185 |
Available-for-sale, maturing after five to ten years, amortized cost | 64,499 |
Available-for-sale, maturing after ten years, amortized cost | 31,423 |
Available-for-sale, amortized cost | 117,191 | $ 83,289
Available-for-sale, maturing within one year, estimated fair value | 84 |
Available-for-sale, maturing after one to five years, estimated fair value | 21,369 |
Available-for-sale, maturing after five to ten years, estimated fair value | 65,480 |
Available-for-sale, maturing after ten years, estimated fair value | 31,802 |
Available-for-sale, amortized cost | 118,735 | 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 | 2,447 |
Held-to-maturity, maturing after ten years, amortized cost | 1,639 |
Held-to-maturity, amortized cost | 4,848 | 6,429
Held-to-maturity, maturing within one year, estimated fair value | 407 |
Held-to-maturity, maturing after one to five years, estimated fair value | 361 |
Held-to-maturity, maturity after five to ten years, estimated fair value | 2,505 |
Held-to-maturity, maturing after ten years, estimated fair value | 1,670 |
Held-to-maturity, amortized cost | $ 4,943 | $ 6,559

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