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Securities - Amortized Cost and Estimated Fair Value of Available-for-Sale Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Available-for-sale debt securities: |  |
Due in one year or less | $ 99,242 | $ 50,922
Due after one year through five years | 307,093 | 508,880
Due after five years through ten years | 245,617 | 367,743
Due after ten years | 27,251 | 39,916
Total | 679,203 | 967,461
Mortgage-backed securities | 869,279 | 864,330
Amortized Cost | 1,548,482 | 1,831,791
Debt Securities, Available-for-Sale, Fair Value, Fiscal Year Maturity [Abstract] |  |
Due in one year or less | 98,650 | 50,269
Due after one year through five years | 296,279 | 459,721
Due after five years through ten years | 233,569 | 314,408
Due after ten years | 22,082 | 31,679
Total | 650,580 | 856,077
Mortgage-backed securities | 766,070 | 738,890
Fair Value | $ 1,416,650 | $ 1,594,967

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