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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) | 3 Months Ended
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Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) | 13. ACCUMULATED 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 |
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 |
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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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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