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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) | 3 Months Ended
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Mar. 31, 2021
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 reclassifications out of accumulated other comprehensive income (loss) are as follows:
|  | Three months ended March 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 |  | $ | (39,658) |  |  | $ | (166) |  |  | $ | (39,492) |  |  | $ | 8,524 |  |  | $ | (30,968) |  |  | $ | 73,576 |  |  | $ | (30,968) |  |  |  |  | $ | 42,608 |
Retirement obligation |  | 0 |  |  | (525) |  |  | 525 |  |  | (120) |  |  | 405 |  |  | (24,912) |  |  | 405 |  |  |  |  | (24,507) |
Total |  | $ | (39,658) |  |  | $ | (691) |  |  | $ | (38,967) |  |  | $ | 8,404 |  |  | $ | (30,563) |  |  | $ | 48,664 |  |  | $ | (30,563) |  |  |  |  | $ | 18,101 |
|  | Three months ended March 31, 2020
|  | 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 |  | $ | (2,434) |  |  | $ | (59) |  |  | $ | (2,375) |  |  | $ | 512 |  |  | $ | (1,863) |  |  | $ | 41,264 |  |  | $ | (1,863) |  |  |  |  | $ | 39,401 |
Retirement obligation |  | 0 |  |  | (425) |  |  | 425 |  |  | (97) |  |  | 328 |  |  | (27,941) |  |  | 328 |  |  |  |  | (27,613) |
Total |  | $ | (2,434) |  |  | $ | (484) |  |  | $ | (1,950) |  |  | $ | 415 |  |  | $ | (1,535) |  |  | $ | 13,323 |  |  | $ | (1,535) |  |  |  |  | $ | 11,788 |
Other Accumulated Comprehensive income reclassified from AOCI | The following table presents the activity reclassified from accumulated other comprehensive income into income during the three month periods ended March 31, 2021 and 2020, respectively:
|  |  |  |  |  | Amount reclassified from accumulated other comprehensive income (loss) |  |
|  |  |  | Three months ended |  |
|  |  |  | March 31, |  |
(Dollars in thousands) |  |  |  |  |  | 2021 |  | 2020 |  | Affected Line Item in the Consolidated Statements of Income
Realized gain (loss) on securities available-for-sale |  |  |  |  |  | $ | (166) |  |  | $ | (59) |  |  | Net gain (loss) on sales of investments securities
Defined benefit pension plan |  |  |  |  |  |  |  |
Amortization of prior service cost (1) |  |  |  |  |  | 100 |  |  | 100 |  |  | Other noninterest expense
Recognized net actuarial loss (1) |  |  |  |  |  | (625) |  |  | (525) |  |  | Other noninterest expense
Defined benefit pension plan total |  |  |  |  |  | (525) |  |  | (425) |  |  |
Total reclassifications for the period, before tax |  |  |  |  |  | $ | (691) |  |  | $ | (484) |  |  |
(1) Included in the computation of net periodic pension cost (see Note 13 - Employee Benefit Plans for additional details).

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