Investment Securities (Tables)
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9 Months Ended |
Sep. 30, 2026 |
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| Investments, Debt and Equity Securities [Abstract] |
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| Schedule of investment securities available-for-sale |
The following table shows investment securities available-for-sale. | | | | | | | | | | | | | | | | | | | | | | | | | | | | (Dollars in thousands) | | Amortized Cost | | Gross Unrealized Gains | | Gross Unrealized Losses | | Fair Value | | September 30, 2026 | | | | | | | | | | U.S. Treasury and Federal agencies securities | | $ | 732,213 | | | $ | — | | | $ | (19,334) | | | $ | 712,879 | | | U.S. States and political subdivisions securities | | 105,758 | | | — | | | (5,511) | | | 100,247 | | | Mortgage-backed securities — Federal agencies | | 767,934 | | | 3 | | | (73,556) | | | 694,381 | | | Corporate debt securities | | 500 | | | — | | | (21) | | | 479 | | | | | | | | | | | | Total debt securities available-for-sale | | $ | 1,606,405 | | | $ | 3 | | | $ | (98,422) | | | $ | 1,507,986 | | | | | | | | | | | | December 31, 2025 | | | | | | | | | | U.S. Treasury and Federal agencies securities | | $ | 697,652 | | | $ | 3,171 | | | $ | (4,046) | | | $ | 696,777 | | | U.S. States and political subdivisions securities | | 113,126 | | | 1,333 | | | (1,396) | | | 113,063 | | | Mortgage-backed securities — Federal agencies | | 757,151 | | | 3,372 | | | (48,380) | | | 712,143 | | | Corporate debt securities | | 500 | | | 3 | | | — | | | 503 | | | | | | | | | | | | Total debt securities available-for-sale | | $ | 1,568,429 | | | $ | 7,879 | | | $ | (53,822) | | | $ | 1,522,486 | |
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| Schedule of contractual maturities of investments in debt securities available-for-sale |
The following table shows the contractual maturities of investments in debt securities available-for-sale at September 30, 2026. Expected maturities will differ from contractual maturities, because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. | | | | | | | | | | | | | | | | (Dollars in thousands) | | Amortized Cost | | Fair Value | | Due in one year or less | | $ | 126,819 | | | $ | 125,372 | | | Due after one year through five years | | 595,358 | | | 577,756 | | | Due after five years through ten years | | 87,567 | | | 83,722 | | | Due after ten years | | 28,727 | | | 26,755 | | | Mortgage-backed securities | | 767,934 | | | 694,381 | | | Total debt securities available-for-sale | | $ | 1,606,405 | | | $ | 1,507,986 | |
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| Schedule of gross realized gains and losses from securities available-for-sale |
The following table summarizes gross unrealized losses and fair value by investment category and age. At September 30, 2026, the Company’s available-for-sale securities portfolio consisted of 593 securities, 589 of which were in an unrealized loss position. | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Less than 12 Months | | 12 months or Longer | | Total | | (Dollars in thousands) | | Fair Value | | Unrealized Losses | | Fair Value | | Unrealized Losses | | Fair Value | | Unrealized Losses | | September 30, 2026 | | | | | | | | | | | | | | U.S. Treasury and Federal agencies securities | | $ | 620,192 | | | $ | (18,113) | | | $ | 92,687 | | | $ | (1,221) | | | $ | 712,879 | | | $ | (19,334) | | | U.S. States and political subdivisions securities | | 77,687 | | | (4,088) | | | 22,560 | | | (1,423) | | | 100,247 | | | (5,511) | | | Mortgage-backed securities - Federal agencies | | 382,621 | | | (16,487) | | | 311,188 | | | (57,069) | | | 693,809 | | | (73,556) | | | Corporate debt securities | | 479 | | | (21) | | | — | | | — | | | 479 | | | (21) | | | | | | | | | | | | | | | | Total debt securities available-for-sale | | $ | 1,080,979 | | | $ | (38,709) | | | $ | 426,435 | | | $ | (59,713) | | | $ | 1,507,414 | | | $ | (98,422) | | | | | | | | | | | | | | | | December 31, 2025 | | | | | | | | | | | | | | U.S. Treasury and Federal agencies securities | | $ | 146,252 | | | $ | (300) | | | $ | 173,152 | | | $ | (3,746) | | | $ | 319,404 | | | $ | (4,046) | | | U.S. States and political subdivisions securities | | 13,587 | | | (81) | | | 29,532 | | | (1,315) | | | 43,119 | | | (1,396) | | | Mortgage-backed securities - Federal agencies | | 75,414 | | | (355) | | | 415,247 | | | (48,025) | | | 490,661 | | | (48,380) | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Total debt securities available-for-sale | | $ | 235,253 | | | $ | (736) | | | $ | 617,931 | | | $ | (53,086) | | | $ | 853,184 | | | $ | (53,822) | |
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| Schedule of proceeds from sales of available-for-sale debt securities portfolio and gross realized gains and losses from the available-for-sale debt securities portfolio |
The following table shows the proceeds from sales of available-for-sale debt securities and the gross realized gains and gross realized losses that have been included in earnings as a result of these sales. Realized gains and losses of all securities are computed using the specific identification cost basis. | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Three Months Ended
September 30, | | Nine Months Ended
September 30, | | (Dollars in thousands) | | 2026 | | 2025 | | 2026 | | 2025 | | Proceeds from sales | | $ | 68,057 | | | $ | 73,537 | | | $ | 68,834 | | | $ | 99,246 | | | Gross realized gains | | — | | | — | | | 13 | | | — | | | Gross realized losses | | (3,818) | | | (1,877) | | | (3,818) | | | (2,874) | | | | | | | | | | | | | | | | | | | |
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