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Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2025
Investments, Debt and Equity Securities [Abstract] |
Amortized Cost, Estimated Fair Value and Allowance for Credit Losses of HTM Securities and AFS Securities by Contractual Maturities | The following table shows the amortized cost, the estimated fair value and the allowance for credit losses of the held-to-maturity securities and available-for-sale securities at September 30, 2025 and December 31, 2024, by contractual maturity within each type:
| At September 30, 2025
(Dollars in thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Allowance for Credit Losses |  | Fair Value
Securities Held-to-Maturity |  |  |  |  |  |  |  |  |
Residential mortgage-backed securities: |  |  |  |  |  |  |  |  |
After 1 year to 5 years | $ | 649 |  |  | $ | — |  |  | $ | (8) |  |  | $ | — |  |  | $ | 641 |
After 5 years to 10 years | 11,337 |  |  | — |  |  | (304) |  |  | — |  |  | 11,033 |
Over 10 years | 114,054 |  |  | 12 |  |  | (13,836) |  |  | — |  |  | 100,230 |
| 126,040 |  |  | 12 |  |  | (14,148) |  |  | — |  |  | 111,904 |
Total | $ | 126,040 |  |  | $ | 12 |  |  | $ | (14,148) |  |  | $ | — |  |  | $ | 111,904 |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |
Residential mortgage-backed securities: |  |  |  |  |  |  |  |  |
Within 1 year | $ | 1 |  |  |  |  | $ | — |  |  | $ | — |  |  | $ | 1 |
After 1 year to 5 years | 166 |  |  |  |  | (2) |  |  | — |  |  | 164 |
After 5 years to 10 years | 9,547 |  |  |  |  | (455) |  |  | — |  |  | 9,092 |
Over 10 years | 310,460 |  |  | 1,167 |  |  | (27,680) |  |  | — |  |  | 283,947 |
| 320,174 |  |  | 1,167 |  |  | (28,137) |  |  | — |  |  | 293,204 |
Collateralized mortgage obligations: |  |  |  |  |  |  |  |  |
After 1 year to 5 years | 89 |  |  | — |  |  | (1) |  |  | — |  |  | 88 |
Over 10 years | 1,447 |  |  | — |  |  | (86) |  |  | — |  |  | 1,361 |
| 1,536 |  |  | — |  |  | (87) |  |  | — |  |  | 1,449 |
Corporate bonds: |  |  |  |  |  |  |  |  |
Within 1 year | 7,475 |  |  | 3 |  |  | (70) |  |  | (10) |  |  | 7,398 |
After 1 year to 5 years | 69,359 |  |  | 112 |  |  | (3,621) |  |  | (7) |  |  | 65,843 |
After 5 years to 10 years | 500 |  |  | — |  |  | — |  |  | (1) |  |  | 499 |
| 77,334 |  |  | 115 |  |  | (3,691) |  |  | (18) |  |  | 73,740 |
Total | $ | 399,044 |  |  | $ | 1,282 |  |  | $ | (31,915) |  |  | $ | (18) |  |  | $ | 368,393 |
| At December 31, 2024
(Dollars in thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Allowance for Credit Losses |  | Fair Value
Securities Held-to-Maturity |  |  |  |  |  |  |  |  |
Residential mortgage-backed securities: |  |  |  |  |  |  |  |  |
After 1 year to 5 years | $ | 1,114 |  |  | $ | — |  |  | $ | (24) |  |  | $ | — |  |  | $ | 1,090 |
After 5 years to 10 years | 10,208 |  |  | — |  |  | (450) |  |  | — |  |  | 9,758 |
Over 10 years | 122,789 |  |  | — |  |  | (18,630) |  |  | — |  |  | 104,159 |
| 134,111 |  |  | — |  |  | (19,104) |  |  | — |  |  | 115,007 |
Total | $ | 134,111 |  |  | $ | — |  |  | $ | (19,104) |  |  | $ | — |  |  | $ | 115,007 |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |
State and political subdivisions: |  |  |  |  |  |  |  |  |
Within 1 year | $ | 1,300 |  |  | $ | — |  |  | $ | (5) |  |  | $ | — |  |  | $ | 1,295 |
| 1,300 |  |  | — |  |  | (5) |  |  | — |  |  | 1,295 |
Residential mortgage-backed securities: |  |  |  |  |  |  |  |  |
Within 1 year | 20 |  |  | — |  |  | — |  |  | — |  |  | 20 |
After 1 year to 5 years | 298 |  |  | — |  |  | (6) |  |  | — |  |  | 292 |
After 5 years to 10 years | 11,260 |  |  | — |  |  | (791) |  |  | — |  |  | 10,469 |
Over 10 years | 311,126 |  |  | 119 |  |  | (38,645) |  |  | — |  |  | 272,600 |
| 322,704 |  |  | 119 |  |  | (39,442) |  |  | — |  |  | 283,381 |
Collateralized mortgage obligations: |  |  |  |  |  |  |  |  |
After 1 year to 5 years | 155 |  |  | — |  |  | (4) |  |  | — |  |  | 151 |
Over 10 years | 1,663 |  |  | — |  |  | (129) |  |  | — |  |  | 1,534 |
| 1,818 |  |  | — |  |  | (133) |  |  | — |  |  | 1,685 |
Corporate bonds: |  |  |  |  |  |  |  |  |
Within 1 year | 5,905 |  |  | 5 |  |  | (58) |  |  | (6) |  |  | 5,846 |
After 1 year to 5 years | 10,924 |  |  | 16 |  |  | (303) |  |  | (31) |  |  | 10,606 |
After 5 years to 10 years | 60,000 |  |  | — |  |  | (4,650) |  |  | (802) |  |  | 54,548 |
| 76,829 |  |  | 21 |  |  | (5,011) |  |  | (839) |  |  | 71,000 |
Total | $ | 402,651 |  |  | $ | 140 |  |  | $ | (44,591) |  |  | $ | (839) |  |  | $ | 357,361 |
Information Related to Sales of Securities Available-for-Sale | The following table presents information related to sales of securities available-for-sale during the nine months ended September 30, 2025 and 2024.
| Nine Months Ended September 30,
(Dollars in thousands) | 2025 |  | 2024
Securities available-for-sale: |  |  |
Proceeds from sales | $ | — |  |  | $ | 505 |
Gross realized gains on sales | — |  |  | 18 |
Tax expense related to net realized gains on sales | — |  |  | 4 |
Unrealized Gain (Loss) on Investments | The following table shows the fair value of securities that were in an unrealized loss position for which an allowance for credit losses has not been recorded at September 30, 2025 and December 31, 2024, by the length of time those securities were in a continuous loss position.
| Less than Twelve Months |  | Twelve Months or Longer |  | Total
(Dollars in thousands) | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
At September 30, 2025 |  |  |  |  |  |  |  |  |  |  |
Securities Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |
Residential mortgage-backed securities | $ | 1,303 |  |  | $ | (4) |  |  | $ | 106,777 |  |  | $ | (14,144) |  |  | $ | 108,080 |  |  | $ | (14,148) |
Total | $ | 1,303 |  |  | $ | (4) |  |  | $ | 106,777 |  |  | $ | (14,144) |  |  | $ | 108,080 |  |  | $ | (14,148) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |
Residential mortgage-backed securities | $ | 5,009 |  |  | $ | (20) |  |  | $ | 206,193 |  |  | $ | (28,117) |  |  | $ | 211,202 |  |  | $ | (28,137) |
Collateralized mortgage obligations | — |  |  | — |  |  | 1,449 |  |  | (87) |  |  | 1,449 |  |  | (87) |
Corporate bonds | 501 |  |  | — |  |  | 56,921 |  |  | (3,573) |  |  | 57,422 |  |  | (3,573) |
Total | $ | 5,510 |  |  | $ | (20) |  |  | $ | 264,563 |  |  | $ | (31,777) |  |  | $ | 270,073 |  |  | $ | (31,797) |
At December 31, 2024 |  |  |  |  |  |  |  |  |  |  |
Securities Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |
Residential mortgage-backed securities | $ | 2,566 |  |  | $ | (50) |  |  | $ | 112,441 |  |  | $ | (19,054) |  |  | $ | 115,007 |  |  | $ | (19,104) |
Total | $ | 2,566 |  |  | $ | (50) |  |  | $ | 112,441 |  |  | $ | (19,054) |  |  | $ | 115,007 |  |  | $ | (19,104) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |
Residential mortgage-backed securities | $ | 65,044 |  |  | $ | (905) |  |  | $ | 205,071 |  |  | $ | (38,537) |  |  | $ | 270,115 |  |  | $ | (39,442) |
Collateralized mortgage obligations | — |  |  | — |  |  | 1,685 |  |  | (133) |  |  | 1,685 |  |  | (133) |
Total | $ | 65,044 |  |  | $ | (905) |  |  | $ | 206,756 |  |  | $ | (38,670) |  |  | $ | 271,800 |  |  | $ | (39,575) |
Available-for-sale Securities, Allowance for Credit Loss Rollforward | The table below presents a roll forward by major security type for the nine months ended September 30, 2025 and September 30, 2024 of the allowance for credit losses on securities available-for-sale.
(Dollars in thousands) | Corporate Bonds
Nine months ended September 30, 2025 |
Securities Available-for-Sale |
Beginning balance | $ | (839) |
Additions for securities for which no previous expected credit losses were recognized | 802 |
Change in securities for which a previous expected credit loss was recognized | 19 |
Ending balance | $ | (18) |
Nine months ended September 30, 2024 |
Securities Available-for-Sale |
Beginning balance | $ | (731) |
Change in securities for which a previous expected credit loss was recognized | 89 |
Ending balance | $ | (642) |
Gain (Loss) on Securities | The following is a summary of unrealized and realized gains and losses on equity securities recognized in other noninterest income in the condensed consolidated statements of income during the nine months ended September 30, 2025 and 2024.
| Nine Months Ended September 30,
(Dollars in thousands) | 2025 |  | 2024
Equity Securities: |  |  |
Net gains recognized during the period | — |  |  | 68 |
Less: Net gains recognized during the period on equity securities sold during the period | — |  |  | 68 |
Unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting date | — |  |  | — |

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