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Accumulated Other Comprehensive Income (Tables) | 9 Months Ended
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Sep. 30, 2025
Accumulated Other Comprehensive Income |
Schedule of Accumulated Other Comprehensive Income | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Unrealized | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | gains and | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | (Losses) on available- | ​ | 2025
​ | ​ | for-sale | ​ | Retirement | ​ | ​ | ​
(Dollar amounts in thousands) |  | Securities |  | plans |  | Total
Beginning balance, July 1, | ​ | $ | (113,761) | ​ | $ | (4,473) | ​ | $ | (118,234)
Change in other comprehensive income (loss) before reclassification | ​ |  | 19,614 | ​ |  | — | ​ |  | 19,614
Amounts reclassified from accumulated other comprehensive income | ​ |  | (18) | ​ |  | 3 | ​ |  | (15)
Net current period other comprehensive income (loss) | ​ |  | 19,596 | ​ |  | 3 | ​ |  | 19,599
Ending balance, September 30, | ​ | $ | (94,165) | ​ | $ | (4,470) | ​ | $ | (98,635)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Unrealized | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | gains and | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | (Losses) on available- | ​ | 2025
​ | ​ | for-sale | ​ | Retirement | ​ | ​ | ​
(Dollar amounts in thousands) |  | Securities |  | plans |  | Total
Beginning balance, January 1, | ​ | $ | (127,807) | ​ | $ | (4,478) | ​ | $ | (132,285)
Change in other comprehensive income (loss) before reclassification | ​ |  | 33,658 | ​ |  | — | ​ |  | 33,658
Amounts reclassified from accumulated other comprehensive income | ​ |  | (16) | ​ |  | 8 | ​ |  | (8)
Net current period other comprehensive income (loss) | ​ |  | 33,642 | ​ |  | 8 | ​ |  | 33,650
Ending balance, September 30, | ​ | $ | (94,165) | ​ | $ | (4,470) | ​ | $ | (98,635)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Unrealized | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | gains and | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | (Losses) on available- | ​ | 2024
​ | ​ | for-sale | ​ | Retirement | ​ |  | ​
(Dollar amounts in thousands) |  | Securities |  | plans |  | Total
Beginning balance, July 1, | ​ | $ | (125,561) | ​ | $ | (8,940) | ​ | $ | (134,501)
Change in other comprehensive income (loss) before reclassification | ​ |  | 31,705 | ​ |  | — | ​ |  | 31,705
Amounts reclassified from accumulated other comprehensive income | ​ |  | (77) | ​ |  | 73 | ​ |  | (4)
Net current period other comprehensive income (loss) | ​ |  | 31,628 | ​ |  | 73 | ​ |  | 31,701
Ending balance, September 30, | ​ | $ | (93,933) | ​ | $ | (8,867) | ​ | $ | (102,800)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Unrealized | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | gains and | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | (Losses) on available- | ​ | 2024
​ | ​ | for-sale | ​ | Retirement | ​ |  | ​
(Dollar amounts in thousands) |  | Securities |  | plans |  | Total
Beginning balance, January 1, | ​ | $ | (118,000) | ​ | $ | (9,087) | ​ | $ | (127,087)
Change in other comprehensive income (loss) before reclassification | ​ |  | 24,145 | ​ |  | — | ​ |  | 24,145
Amounts reclassified from accumulated other comprehensive income | ​ |  | (78) | ​ |  | 220 | ​ |  | 142
Net current period other comprehensive income (loss) | ​ |  | 24,067 | ​ |  | 220 | ​ |  | 24,287
Ending balance, September 30, | ​ | $ | (93,933) | ​ | $ | (8,867) | ​ | $ | (102,800)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Balance at | ​ | Current Period | ​ | Balance at
(Dollar amounts in thousands) |  | 7/1/2025 |  | Change |  | 9/30/2025
Unrealized gains (losses) on securities available-for-sale without other than temporary impairment | ​ | $ | (115,942) | ​ | $ | 19,645 | ​ | $ | (96,297)
Unrealized gains (losses) on securities available-for-sale with other than temporary impairment | ​ |  | 2,181 | ​ |  | (49) | ​ |  | 2,132
Total unrealized loss on securities available-for-sale | ​ | $ | (113,761) | ​ | $ | 19,596 | ​ | $ | (94,165)
Unrealized gain (loss) on retirement plans | ​ |  | (4,473) | ​ |  | 3 | ​ |  | (4,470)
TOTAL | ​ | $ | (118,234) | ​ | $ | 19,599 | ​ | $ | (98,635)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Balance at | ​ | Current Period | ​ | Balance at
(Dollar amounts in thousands) |  | 1/1/2025 |  | Change |  | 9/30/2025
Unrealized gains (losses) on securities available-for-sale without other than temporary impairment | ​ | $ | (129,979) | ​ | $ | 33,682 | ​ | $ | (96,297)
Unrealized gains (losses) on securities available-for-sale with other than temporary impairment | ​ |  | 2,172 | ​ |  | (40) | ​ |  | 2,132
Total unrealized gain (loss) on securities available-for-sale | ​ | $ | (127,807) | ​ | $ | 33,642 | ​ | $ | (94,165)
Unrealized gain (loss) on retirement plans | ​ |  | (4,478) | ​ |  | 8 | ​ |  | (4,470)
TOTAL | ​ | $ | (132,285) | ​ | $ | 33,650 | ​ | $ | (98,635)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Balance at | ​ | Current Period | ​ | Balance at
(Dollar amounts in thousands) |  | 7/1/2024 |  | Change |  | 9/30/2024
Unrealized gains (losses) on securities available-for-sale without other than temporary impairment | ​ | $ | (127,730) | ​ | $ | 31,640 | ​ | $ | (96,090)
Unrealized gains (losses) on securities available-for-sale with other than temporary impairment | ​ |  | 2,169 | ​ |  | (12) | ​ |  | 2,157
Total unrealized gain (loss) on securities available-for-sale | ​ | $ | (125,561) | ​ | $ | 31,628 | ​ | $ | (93,933)
Unrealized loss on retirement plans | ​ |  | (8,940) | ​ |  | 73 | ​ |  | (8,867)
TOTAL | ​ | $ | (134,501) | ​ | $ | 31,701 | ​ | $ | (102,800)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Balance at | ​ | Current Period | ​ | Balance at
(Dollar amounts in thousands) |  | 1/1/2024 |  | Change |  | 9/30/2024
Unrealized gains (losses) on securities available-for-sale without other than temporary impairment | ​ | $ | (120,252) | ​ | $ | 24,162 | ​ | $ | (96,090)
Unrealized gains (losses) on securities available-for-sale with other than temporary impairment | ​ |  | 2,252 | ​ |  | (95) | ​ |  | 2,157
Total unrealized income (loss) on securities available-for-sale | ​ | $ | (118,000) | ​ | $ | 24,067 | ​ | $ | (93,933)
Unrealized gain (loss) on retirement plans | ​ |  | (9,087) | ​ |  | 220 | ​ |  | (8,867)
TOTAL | ​ | $ | (127,087) | ​ | $ | 24,287 | ​ | $ | (102,800)
​
Reclassification out of Accumulated Other Comprehensive Income | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended September 30, 2025 |  | ​ |
Details about accumulated | ​ | Amount reclassified from | ​ | ​ | Affected line item in
other comprehensive | ​ | accumulated other | ​ | ​ | the statement where
income components |  | comprehensive income |  | ​ | net income is presented
​ | ​ | (in thousands) | ​ | ​ | ​
Unrealized gains and losses | ​ | $ | 24 |  | ​ | Net securities gains (losses)
on available-for-sale | ​ |  | (6) |  | ​ | Income tax expense
securities | ​ | $ | 18 |  | ​ | Net of tax
​ | ​ | ​ | ​ | ​ | ​ | ​
Amortization of | ​ | $ | (4) | (a) | ​ | Salary and benefits
retirement plan items | ​ |  | 1 |  | ​ | Income tax expense
​ | ​ | $ | (3) |  | ​ | Net of tax
Total reclassifications for the period | ​ | $ | 15 |  | ​ | Net of tax
| (a) | Included in the computation of net periodic benefit cost. (see Footnote 8 for additional details).
​ ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Nine Months Ended September 30, 2025 |  | ​ |
Details about accumulated | ​ | Amount reclassified from | ​ | ​ | Affected line item in
other comprehensive | ​ | accumulated other | ​ | ​ | the statement where
income components |  | comprehensive income |  | ​ | net income is presented
​ | ​ | (in thousands) | ​ | ​ | ​
Unrealized gains and losses | ​ | $ | 21 |  | ​ | Net securities gains (losses)
on available-for-sale | ​ |  | (5) |  | ​ | Income tax expense
securities | ​ | $ | 16 |  | ​ | Net of tax
​ | ​ | ​ | ​ | ​ | ​ | ​
Amortization of | ​ | $ | (11) | (a) | ​ | Salary and benefits
retirement plan items | ​ |  | 3 |  | ​ | Income tax expense
​ | ​ | $ | (8) |  | ​ | Net of tax
Total reclassifications for the period | ​ | $ | 8 |  | ​ | Net of tax
| (a) | Included in the computation of net periodic benefit cost. (see Footnote 8 for additional details).
​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, 2024 | ​ | ​ | ​
Details about accumulated | ​ | Amount reclassified from | ​ | ​ | Affected line item in
other comprehensive | ​ | accumulated other | ​ | ​ | the statement where
income components |  | comprehensive income |  | ​ | net income is presented
​ |  | (in thousands) |  | ​ | ​
Unrealized gains and losses | ​ | $ | 103 |  | ​ | Net securities gains (losses)
on available-for-sale | ​ |  | (26) |  | ​ | Income tax expense
securities | ​ | $ | 77 |  | ​ | Net of tax
​ | ​ | ​ | ​ | ​ | ​ | ​
Amortization of | ​ | $ | (97) | (a) | ​ | Salary and benefits
retirement plan items | ​ |  | 24 |  | ​ | Income tax expense
​ | ​ | $ | (73) |  | ​ | Net of tax
Total reclassifications for the period | ​ | $ | 4 |  | ​ | Net of tax
| (a) | Included in the computation of net periodic benefit cost. (see Footnote 8 for additional details).
​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Nine Months Ended September 30, 2024 | ​ | ​ | ​
Details about accumulated | ​ | Amount reclassified from | ​ | ​ | Affected line item in
other comprehensive | ​ | accumulated other | ​ | ​ | the statement where
income components |  | comprehensive income |  | ​ | net income is presented
​ |  | (in thousands) |  | ​ | ​
Unrealized gains and losses | ​ | $ | 104 |  | ​ | Net securities gains (losses)
on available-for-sale | ​ |  | (26) |  | ​ | Income tax expense
securities | ​ | $ | 78 |  | ​ | Net of tax
​ | ​ | ​ | ​ | ​ | ​ | ​
Amortization of | ​ | $ | (293) | (a) | ​ | Salary and benefits
retirement plan items | ​ |  | 73 |  | ​ | Income tax expense
​ | ​ | $ | (220) |  | ​ | Net of tax
Total reclassifications for the period | ​ | $ | (142) |  | ​ | Net of tax
| (a) | Included in the computation of net periodic benefit cost. (see Footnote 8 for additional details).

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