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Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Contractual maturities of investments in debt securities available-for-sale, Amortized Cost |  |
Due in one year or less | $ 224,596 |
Due after one year through five years | 493,746 |
Due after five years through ten years | 81,820 |
Due after ten years | 13,262 |
Mortgage-backed securities | 742,140 |
Amortized cost of Investment Securities available-for-sale | 1,555,564 | $ 1,650,684
Contractual maturities of investments in debt securities available-for-sale, Fair Value |  |
Due in one year or less | 221,779 |
Due after one year through five years | 488,358 |
Due after five years through ten years | 82,595 |
Due after ten years | 13,307 |
Mortgage-backed securities | 689,078 |
Total debt securities available-for-sale | 1,495,117 | 1,536,299
Accrued interest receivable on investment securities available-for-sale | 5,330 | 4,680
U.S. Treasury and Federal agencies securities |  |
Contractual maturities of investments in debt securities available-for-sale, Amortized Cost |  |
Amortized cost of Investment Securities available-for-sale | 706,387 | 786,417
Contractual maturities of investments in debt securities available-for-sale, Fair Value |  |
Total debt securities available-for-sale | 699,857 | 757,749
U.S. States and political subdivisions securities |  |
Contractual maturities of investments in debt securities available-for-sale, Amortized Cost |  |
Amortized cost of Investment Securities available-for-sale | 106,537 | 86,305
Contractual maturities of investments in debt securities available-for-sale, Fair Value |  |
Total debt securities available-for-sale | 105,680 | 82,632
Mortgage-backed securities - Federal agencies |  |
Contractual maturities of investments in debt securities available-for-sale, Amortized Cost |  |
Amortized cost of Investment Securities available-for-sale | 742,140 | 777,962
Contractual maturities of investments in debt securities available-for-sale, Fair Value |  |
Total debt securities available-for-sale | 689,078 | $ 695,918
Corporate debt securities |  |
Contractual maturities of investments in debt securities available-for-sale, Amortized Cost |  |
Amortized cost of Investment Securities available-for-sale | 500 |
Contractual maturities of investments in debt securities available-for-sale, Fair Value |  |
Total debt securities available-for-sale | $ 502 |

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