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Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2025
Investments, Debt and Equity Securities [Abstract] |
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, 2025 |  |  |  |  |  |  |  |
U.S. Treasury and Federal agencies securities |  | $ | 706,387 |  |  | $ | 2,644 |  |  | $ | (9,174) |  |  | $ | 699,857 |
U.S. States and political subdivisions securities |  | 106,537 |  |  | 1,048 |  |  | (1,905) |  |  | 105,680 |
Mortgage-backed securities — Federal agencies |  | 742,140 |  |  | 2,590 |  |  | (55,652) |  |  | 689,078 |
Corporate debt securities |  | 500 |  |  | 2 |  |  | — |  |  | 502 |
Total debt securities available-for-sale |  | $ | 1,555,564 |  |  | $ | 6,284 |  |  | $ | (66,731) |  |  | $ | 1,495,117 |
December 31, 2024 |  |  |  |  |  |  |  |
U.S. Treasury and Federal agencies securities |  | $ | 786,417 |  |  | $ | 24 |  |  | $ | (28,692) |  |  | $ | 757,749 |
U.S. States and political subdivisions securities |  | 86,305 |  |  | 33 |  |  | (3,706) |  |  | 82,632 |
Mortgage-backed securities — Federal agencies |  | 777,962 |  |  | 192 |  |  | (82,236) |  |  | 695,918 |
Total debt securities available-for-sale |  | $ | 1,650,684 |  |  | $ | 249 |  |  | $ | (114,634) |  |  | $ | 1,536,299 |
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, 2025. 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 |  | $ | 224,596 |  |  | $ | 221,779 |
Due after one year through five years |  | 493,746 |  |  | 488,358 |
Due after five years through ten years |  | 81,820 |  |  | 82,595 |
Due after ten years |  | 13,262 |  |  | 13,307 |
Mortgage-backed securities |  | 742,140 |  |  | 689,078 |
Total debt securities available-for-sale |  | $ | 1,555,564 |  |  | $ | 1,495,117 |
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, 2025, the Company’s available-for-sale securities portfolio consisted of 632 securities, 467 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, 2025 |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and Federal agencies securities |  | $ | 108,618 |  |  | $ | (500) |  |  | $ | 392,971 |  |  | $ | (8,674) |  |  | $ | 501,589 |  |  | $ | (9,174) |
U.S. States and political subdivisions securities |  | 12,156 |  |  | (121) |  |  | 33,728 |  |  | (1,784) |  |  | 45,884 |  |  | (1,905) |
Mortgage-backed securities - Federal agencies |  | 33,556 |  |  | (171) |  |  | 470,737 |  |  | (55,481) |  |  | 504,293 |  |  | (55,652) |
Total debt securities available-for-sale |  | $ | 154,330 |  |  | $ | (792) |  |  | $ | 897,436 |  |  | $ | (65,939) |  |  | $ | 1,051,766 |  |  | $ | (66,731) |
December 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and Federal agencies securities |  | $ | 103,621 |  |  | $ | (1,324) |  |  | $ | 644,614 |  |  | $ | (27,368) |  |  | $ | 748,235 |  |  | $ | (28,692) |
U.S. States and political subdivisions securities |  | 37,017 |  |  | (670) |  |  | 39,280 |  |  | (3,036) |  |  | 76,297 |  |  | (3,706) |
Mortgage-backed securities - Federal agencies |  | 191,779 |  |  | (3,355) |  |  | 466,204 |  |  | (78,881) |  |  | 657,983 |  |  | (82,236) |
Total debt securities available-for-sale |  | $ | 332,417 |  |  | $ | (5,349) |  |  | $ | 1,150,098 |  |  | $ | (109,285) |  |  | $ | 1,482,515 |  |  | $ | (114,634) |
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) |  | 2025 |  | 2024 |  | 2025 |  | 2024
Proceeds from sales |  | $ | 73,537 |  |  | $ | — |  |  | $ | 99,246 |  |  | $ | — |
Gross realized gains |  | — |  |  | — |  |  | — |  |  | — |
Gross realized losses |  | 1,877 |  |  | — |  |  | 2,874 |  |  | — |

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