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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) | 12 Months Ended
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Dec. 31, 2023
Equity [Abstract] |
Related Tax Effects Allocated to Other Comprehensive Income and Accumulated Other Comprehensive Income (Loss) | The related tax effects allocated to other comprehensive income and accumulated other comprehensive income (loss) are as follows:
|  | December 31, 2023
|  | Total other comprehensive income (loss) |  | Total accumulated other comprehensive income (loss)
(Dollars in thousands) |  | Prior to reclass |  | Reclass from |  | Pre-tax |  | Tax effect |  | Net of tax |  | Beginning balance |  | Net activity |  | Ending balance
Unrealized gain (loss) on debt securities |  | $ | 55,129 |  |  | $ | (1,258) |  |  | $ | 56,387 |  |  | $ | (12,420) |  |  | $ | 43,967 |  |  | $ | (325,925) |  |  | $ | 43,967 |  |  | $ | (281,958) |
Unrealized gain (loss) on derivatives |  | 4,648 |  |  | (237) |  |  | 4,885 |  |  | (1,130) |  |  | 3,755 |  |  | 0 |  |  | 3,755 |  |  | 3,755 |
Retirement obligation |  | 432 |  |  | (747) |  |  | 1,179 |  |  | (273) |  |  | 906 |  |  | (32,023) |  |  | 906 |  |  | (31,117) |
Foreign currency translation |  | 216 |  |  | 0 |  |  | 216 |  |  | 0 |  |  | 216 |  |  | (715) |  |  | 216 |  |  | (499) |
Total |  | $ | 60,425 |  |  | $ | (2,242) |  |  | $ | 62,667 |  |  | $ | (13,823) |  |  | $ | 48,844 |  |  | $ | (358,663) |  |  | $ | 48,844 |  |  | $ | (309,819) |
|  | December 31, 2022
|  | Total other comprehensive income (loss) |  | Total accumulated other comprehensive income (loss)
(Dollars in thousands) |  | Prior to reclass |  | Reclass from |  | Pre-tax |  | Tax-effect |  | Net of tax |  | Beginning Balance |  | Net Activity |  | Ending Balance
Unrealized gain (loss) on debt securities |  | $ | (444,257) |  |  | $ | 569 |  |  | $ | (444,826) |  |  | $ | 97,863 |  |  | $ | (346,963) |  |  | $ | 21,038 |  |  | $ | (346,963) |  |  | $ | (325,925) |
Retirement obligation |  | (16,000) |  |  | (1,334) |  |  | (14,666) |  |  | 3,489 |  |  | (11,177) |  |  | (20,846) |  |  | (11,177) |  |  | (32,023) |
Foreign currency translation |  | (90) |  |  | 0 |  |  | (90) |  |  | 0 |  |  | (90) |  |  | (625) |  |  | (90) |  |  | (715) |
Total |  | $ | (460,347) |  |  | $ | (765) |  |  | $ | (459,582) |  |  | $ | 101,352 |  |  | $ | (358,230) |  |  | $ | (433) |  |  | $ | (358,230) |  |  | $ | (358,663) |
|  | December 31, 2021 |
|  | Total other comprehensive income (loss) |  | Total accumulated other comprehensive income (loss) |
(Dollars in thousands) |  | Prior to reclass |  | Reclass from |  | Pre-tax |  | Tax-effect |  | Net of tax |  | Beginning Balance |  | Net Activity |  | Ending Balance
Unrealized gain (loss) on debt securities |  | $ | (67,759) |  |  | $ | (759) |  |  | $ | (67,000) |  |  | $ | 14,462 |  |  | $ | (52,538) |  |  | $ | 73,576 |  |  | $ | (52,538) |  |  | $ | 21,038 |
Retirement obligation |  | 3,068 |  |  | (2,198) |  |  | 5,266 |  |  | (1,200) |  |  | 4,066 |  |  | (24,912) |  |  | 4,066 |  |  | (20,846) |
Foreign currency translation |  | (625) |  |  | 0 |  |  | (625) |  |  | 0 |  |  | (625) |  |  | 0 |  |  | (625) |  |  | (625) |
Total |  | $ | (65,316) |  |  | $ | (2,957) |  |  | $ | (62,359) |  |  | $ | 13,262 |  |  | $ | (49,097) |  |  | $ | 48,664 |  |  | $ | (49,097) |  |  | $ | (433) |
Other Accumulated Comprehensive income reclassified from AOCI [Table Text Block] | The following table details the activity reclassified from accumulated other comprehensive income into income during the period:
|  | Amount Reclassified from Accumulated Other Comprehensive Income (1) |  |
|  | December 31, |  |
(Dollars in thousands) |  | 2023 |  | 2022 |  | 2021 |  | Affected Line Item in the Consolidated Statements of Income
Gain and loss on cash flow hedges |  |  |  |  |  |  |  |
Interest rate contracts |  | $ | (237) |  |  | $ | 0 |  |  | $ | 0 |  |  | Interest expense - deposits
Realized gains and losses on securities available-for-sale |  | (1,258) |  |  | 569 |  |  | (759) |  |  | Net gain (loss) on sales/transfers of investment securities
Defined benefit pension plan |  |  |  |  |  |  |  |
Amortization of prior service cost (2) |  | (10) |  |  | 302 |  |  | 413 |  |  | Other noninterest expense
Recognized net actuarial loss (2) |  | (737) |  |  | (1,636) |  |  | (2,611) |  |  | Other noninterest expense
Amortization and settlement charges of defined benefit pension items |  | (747) |  |  | (1,334) |  |  | (2,198) |  |  |
Total reclassifications for the period, before tax |  | $ | (2,242) |  |  | $ | (765) |  |  | $ | (2,957) |  |  |
(1) Negative amounts are debits to profit/loss. (2) Included in the computation of net periodic pension cost (see Note 17 - Employee Benefit Plans for additional details)

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