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Securities - Amortized Cost and Estimated Fair Value of Available-for-Sale Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Amortized Cost
Due in one year or less	$ 99,896	$ 99,242
Due after one year through five years	299,154	307,093
Due after five years through ten years	244,129	245,617
Due after ten years	26,350	27,251
Total	669,529	679,203
Mortgage-backed securities	841,942	869,279
Amortized Cost	1,511,471	1,548,482
Fair Value
Due in one year or less	99,423	98,650
Due after one year through five years	286,149	296,279
Due after five years through ten years	229,834	233,569
Due after ten years	20,696	22,082
Total	636,102	650,580
Mortgage-backed securities	730,253	766,070
Fair Value	$ 1,366,355	$ 1,416,650

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