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Securities - Contractual Maturities of Debt Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 35,066 |
Due after one year through five years | 87,794 |
Due after five years through ten years | 95,316 |
Due after ten years | 21,022 |
Available-for-Sale Debt Securities With Maturities, Amortized Cost | 239,198 |
Amortized Cost | 815,280 | $ 737,005
Fair Value |  |
Due in one year or less | 35,402 |
Due after one year through five years | 91,953 |
Due after five years through ten years | 97,577 |
Due after ten years | 23,336 |
Available-for-Sale Debt Securities With Maturities, Fair Value | 248,268 |
Total Available-for-Sale Debt Securities, Fair Value | 839,279 | 770,393
Collateralized mortgage obligations of U.S. government corporations and agencies |  |
Amortized Cost |  |
Available-for-Sale Debt Securities With Maturities | 197,458 |
Amortized Cost | 197,458 | 202,975
Fair Value |  |
Available-for-Sale Debt Securities With Maturities | 201,350 |
Total Available-for-Sale Debt Securities, Fair Value | 201,350 | 209,296
Residential mortgage-backed securities of U.S. government corporations and agencies |  |
Amortized Cost |  |
Available-for-Sale Debt Securities With Maturities | 63,896 |
Amortized Cost | 63,896 | 66,960
Fair Value |  |
Available-for-Sale Debt Securities With Maturities | 63,859 |
Total Available-for-Sale Debt Securities, Fair Value | 63,859 | 67,778
Commercial mortgage-backed securities of U.S. government corporations and agencies |  |
Amortized Cost |  |
Available-for-Sale Debt Securities With Maturities | 314,228 |
Amortized Cost | 314,228 | 258,875
Fair Value |  |
Available-for-Sale Debt Securities With Maturities | 325,303 |
Total Available-for-Sale Debt Securities, Fair Value | 325,303 | $ 273,681
Corporate obligations |  |
Amortized Cost |  |
Available-for-Sale Debt Securities With Maturities | 500 |
Fair Value |  |
Available-for-Sale Debt Securities With Maturities | $ 499 |

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