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OTHER COMPREHENSIVE INCOME (LOSS) (Tables) | 12 Months Ended
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Dec. 31, 2023
OTHER COMPREHENSIVE INCOME (LOSS) |
Schedule of Accumulated Other Comprehensive Income | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Unrealized | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | gains and | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | (Losses) on available- | ​ | 2023
​ | ​ | for-sale | ​ | Retirement | ​ | ​ | ​
(Dollar amounts in thousands) |  | Securities |  | plans |  | Total
Beginning balance, January 1, | ​ | $ | (128,896) | ​ | $ | (11,078) | ​ | $ | (139,974)
Change in other comprehensive income (loss) before reclassification | ​ |  | 10,895 | ​ |  | 1,427 | ​ |  | 12,322
Amounts reclassified from accumulated other comprehensive income | ​ |  | 1 | ​ |  | 564 | ​ |  | 565
Net current period other comprehensive income (loss) | ​ |  | 10,896 | ​ |  | 1,991 | ​ |  | 12,887
Ending balance, December 31, | ​ | $ | (118,000) | ​ | $ | (9,087) | ​ | $ | (127,087)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Unrealized | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | gains and | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | (Losses) on available- | ​ | 2022
​ | ​ | for-sale | ​ | Retirement | ​ |  | ​
(Dollar amounts in thousands) |  | Securities |  | plans |  | Total
Beginning balance, January 1, | ​ | $ | 15,674 | ​ | $ | (18,100) | ​ | $ | (2,426)
Change in other comprehensive income (loss) before reclassification | ​ |  | (144,568) | ​ |  | 6,078 | ​ |  | (138,490)
Amounts reclassified from accumulated other comprehensive income | ​ |  | (2) | ​ |  | 944 | ​ |  | 942
Net current period other comprehensive income (loss) | ​ |  | (144,570) | ​ |  | 7,022 | ​ |  | (137,548)
Ending balance, December 31, | ​ | $ | (128,896) | ​ | $ | (11,078) | ​ | $ | (139,974)
Schedule Of Accumulated Other Comprehensive Income Loss Other Than Temporary Impairment | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Balance at | ​ | Current Period | ​ | Balance at
(Dollar amounts in thousands) |  | 1/1/2023 |  | Change |  | 12/31/2023
Unrealized gains (losses) on securities available-for-sale without other than temporary impairment | ​ | $ | (131,135) | ​ | $ | 10,883 | ​ | $ | (120,252)
Unrealized gains (losses) on securities available-for-sale with other than temporary impairment | ​ |  | 2,239 | ​ |  | 13 | ​ |  | 2,252
Total unrealized gain (loss) on securities available-for-sale | ​ | $ | (128,896) | ​ | $ | 10,896 | ​ | $ | (118,000)
Unrealized gain (loss) on retirement plans | ​ |  | (11,078) | ​ |  | 1,991 | ​ |  | (9,087)
TOTAL | ​ | $ | (139,974) | ​ | $ | 12,887 | ​ | $ | (127,087)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Balance at | ​ | Current Period | ​ | Balance at
(Dollar amounts in thousands) |  | 1/1/2022 |  | Change |  | 12/31/2022
Unrealized gains (losses) on securities available-for-sale without other than temporary impairment | ​ | $ | 13,155 | ​ | $ | (144,290) | ​ | $ | (131,135)
Unrealized gains (losses) on securities available-for-sale with other than temporary impairment | ​ |  | 2,519 | ​ |  | (280) | ​ |  | 2,239
Total unrealized income (loss) on securities available-for-sale | ​ | $ | 15,674 | ​ | $ | (144,570) | ​ | $ | (128,896)
Unrealized gain (loss) on retirement plans | ​ |  | (18,100) | ​ |  | 7,022 | ​ |  | (11,078)
TOTAL | ​ | $ | (2,426) | ​ | $ | (137,548) | ​ | $ | (139,974)
Reclassification out of Accumulated Other Comprehensive Income |
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Balance at December 31, 2023 |  |
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 | ​ | $ | (1) |  | Net securities gains (losses)
on available-for-sale | ​ |  | — |  | Income tax expense
securities | ​ | $ | (1) |  | Net of tax
​ | ​ | ​ | ​ | ​ | ​
Amortization of | ​ | $ | (752) | (a) | Salary and benefits
retirement plan items | ​ |  | 188 |  | Income tax expense
​ | ​ | $ | (564) |  | Net of tax
Total reclassifications for the period | ​ | $ | (565) |  | Net of tax
(a) | Included in the computation of net periodic benefit cost which is included in salaries and benefits. (see Footnote 16 for additional details).
​ ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Balance at December 31, 2022 | ​ | ​
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 | ​ | $ | 3 |  | Net securities gains (losses)
on available-for-sale | ​ |  | (1) |  | Income tax expense
securities | ​ | $ | 2 |  | Net of tax
​ | ​ | ​ | ​ | ​ | ​
Amortization of | ​ | $ | (1,259) | (a) | Salary and benefits
retirement plan items | ​ |  | 315 |  | Income tax expense
​ | ​ | $ | (944) |  | Net of tax
Total reclassifications for the period | ​ | $ | (942) |  | Net of tax
(a) | Included in the computation of net periodic benefit cost which is included in salaries and benefits. (see Footnote 16 for additional details).
​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Balance at December 31, 2021 | ​ | ​
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 | ​ | $ | 114 |  | Net securities gains (losses)
on available-for-sale | ​ |  | (29) |  | Income tax expense
securities | ​ | $ | 85 |  | Net of tax
​ | ​ | ​ | ​ | ​ | ​
Amortization of | ​ | $ | (2,072) | (a) | ​
retirement plan items | ​ |  | 518 |  | Income tax expense
​ | ​ | $ | (1,554) |  | Net of tax
Total reclassifications for the period | ​ | $ | (1,469) |  | Net of tax
(a) | Included in the computation of net periodic benefit cost which is included in salaries and benefits. (see Footnote 16 for additional details).

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