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Securities - Amortized Cost and Estimated Fair Value of Available-for-Sale Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 120,400 | $ 100,000
Due after one year through five years | 226,338 | 227,502
Due after five years through ten years | 213,159 | 212,789
Due after ten years | 2,324 | 22,326
Total | 562,221 | 562,617
Mortgage-backed securities | 811,223 | 804,506
Amortized Cost | 1,373,444 | 1,367,123
Fair Value |  |
Due in one year or less | 119,965 | 99,153
Due after one year through five years | 217,042 | 215,976
Due after five years through ten years | 200,515 | 199,457
Due after ten years | 1,796 | 17,332
Total | 539,318 | 531,918
Mortgage-backed securities | 720,024 | 699,614
Fair Value | $ 1,259,342 | $ 1,231,532

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 + Details
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