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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) | 3 Months Ended
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Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of components of other comprehensive income (loss) | The following tables present the components of other comprehensive income for the three months ended March 31, 2021 and 2020, by component:
(dollars in thousands) | Before Tax |  | Tax Effect |  | Net of Tax
Three Months Ended March 31, 2021 |  |  |  |  |
Net unrealized losses on investment securities: |  |  |  |  |
Net unrealized losses arising during the period | $ | (23,619) |  |  | $ | (6,318) |  |  | $ | (17,301) |
Less: Reclassification adjustments from AOCI realized in net income | — |  |  | — |  |  | — |
Net unrealized losses on investment securities | (23,619) |  |  | (6,318) |  |  | (17,301) |
Defined benefit plans: |  |  |  |  |
Amortization of net actuarial loss | 246 |  |  | 66 |  |  | 180 |
Amortization of net transition obligation | 5 |  |  | 1 |  |  | 4 |
Defined benefit plans, net | 251 |  |  | 67 |  |  | 184 |
Other comprehensive loss | $ | (23,368) |  |  | $ | (6,251) |  |  | $ | (17,117) |
(dollars in thousands) | Before Tax |  | Tax Effect |  | Net of Tax
Three Months Ended March 31, 2020 |  |  |  |  |
Net unrealized gains on investment securities: |  |  |  |  |
Net unrealized gains arising during the period | $ | 13,858 |  |  | $ | 3,711 |  |  | $ | 10,147 |
Less: Reclassification adjustments from AOCI realized in net income | — |  |  | — |  |  | — |
Net unrealized gains on investment securities | 13,858 |  |  | 3,711 |  |  | 10,147 |
Defined benefit plans: |  |  |  |  |
Net actuarial gains arising during the period | 427 |  |  | 114 |  |  | 313 |
Amortization of net actuarial loss | 268 |  |  | 72 |  |  | 196 |
Amortization of net transition obligation | 5 |  |  | 1 |  |  | 4 |
Amortization of prior service cost | 4 |  |  | 1 |  |  | 3 |
Defined benefit plans, net | 704 |  |  | 188 |  |  | 516 |
Other comprehensive income | $ | 14,562 |  |  | $ | 3,899 |  |  | $ | 10,663 |
Schedule of changes in each component of AOCI, net of tax | The following tables present the changes in each component of AOCI, net of tax, for the three months ended March 31, 2021 and 2020:
(dollars in thousands) | Investment Securities |  | Defined Benefit Plans |  | AOCI
Three Months Ended March 31, 2021 |  |  |  |  |
Balance at beginning of period | $ | 26,651 |  |  | $ | (6,523) |  |  | $ | 20,128 |
Other comprehensive income (loss) before reclassifications | (17,301) |  |  | — |  |  | (17,301) |
Reclassification adjustments from AOCI | — |  |  | 184 |  |  | 184 |
Total other comprehensive income (loss) | (17,301) |  |  | 184 |  |  | (17,117) |
Balance at end of period | $ | 9,350 |  |  | $ | (6,339) |  |  | $ | 3,011 |
(dollars in thousands) | Investment Securities |  | Defined Benefit Plans |  | AOCI
Three Months Ended March 31, 2020 |  |  |  |  |
Balance at beginning of period | $ | 14,825 |  |  | $ | (6,416) |  |  | $ | 8,409 |
Other comprehensive income before reclassifications | 10,147 |  |  | 313 |  |  | 10,460 |
Reclassification adjustments from AOCI | — |  |  | 203 |  |  | 203 |
Total other comprehensive income | 10,147 |  |  | 516 |  |  | 10,663 |
Balance at end of period | $ | 24,972 |  |  | $ | (5,900) |  |  | $ | 19,072 |
Schedule of amounts reclassified out of each component of AOCI | The following table presents the amounts reclassified out of each component of AOCI for the three months ended March 31, 2021 and 2020:
| Amount Reclassified from AOCI |  | Affected Line Item in the Statement Where Net Income is Presented
Details about AOCI Components | Three months ended March 31, |
(dollars in thousands) | 2021 |  | 2020 |
Defined benefit retirement and supplemental executive retirement plan items: |  |  |  |  |
Amortization of net actuarial loss | $ | (246) |  |  | $ | (268) |  |  | Other operating expense - other
Amortization of net transition obligation | (5) |  |  | (5) |  |  | Other operating expense - other
Amortization of prior service cost | — |  |  | (4) |  |  | Other operating expense - other
Total before tax | (251) |  |  | (277) |  |  |
Tax effect | 67 |  |  | 74 |  |  | Income tax benefit (expense)
Net of tax | $ | (184) |  |  | $ | (203) |  |  |
Total reclassification adjustments from AOCI for the period, net of tax | $ | (184) |  |  | $ | (203) |  |  |

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