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ACCUMULATED OTHER COMPREHENSIVE INCOME OR LOSS (Tables) | 12 Months Ended
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Dec. 31, 2020
Equity [Abstract] |
Summary of Changes in Accumulated Other Comprehensive Income or Loss by Component, Net of Tax | The following is a summary of the changes in accumulated other comprehensive income or loss by component, net of tax, for the periods indicated (in thousands):
|  | Unrealized Gains and Losses on Securities Available for Sale |  | Defined Benefit and Other Benefit Plans |  | Total
Balance at January 1, 2020 |  | $ | 1,368 |  |  | $ | (7,167) |  |  | $ | (5,799) |
Other comprehensive income before reclassification |  | 7,759 |  |  | 377 |  |  | 8,136 |
Amounts reclassified from accumulated other comprehensive income (loss) |  | — |  |  | 64 |  |  | 64 |
Net current period other comprehensive income (loss) |  | 7,759 |  |  | 441 |  |  | 8,200 |
Balance at December 31, 2020 |  | $ | 9,127 |  |  | $ | (6,726) |  |  | $ | 2,401 |
|  | Unrealized Gains and Losses on Securities Available for Sale |  | Defined Benefit and Other Benefit Plans |  | Total
Balance at January 1, 2019 |  | $ | (4,646) |  |  | $ | (6,765) |  |  | $ | (11,411) |
Other comprehensive income (loss) before reclassification |  | 6,028 |  |  | (467) |  |  | 5,561 |
Amounts reclassified from accumulated other comprehensive income (loss) |  | (14) |  |  | 65 |  |  | 51 |
Net current period other comprehensive income (loss) |  | 6,014 |  |  | (402) |  |  | 5,612 |
Balance at December 31, 2019 |  | $ | 1,368 |  |  | $ | (7,167) |  |  | $ | (5,799) |
|  | Unrealized Gains and Losses on Securities Available for Sale |  | Defined Benefit and Other Benefit Plans |  | Total
Balance at Balance at December 31, 2017 |  | $ | (3,415) |  |  | $ | (6,925) |  |  | $ | (10,340) |
Cumulative effect of accounting change |  | (202) |  |  | — |  |  | (202) |
Balance at January 1, 2018 |  | (3,617) |  |  | (6,925) |  |  | (10,542) |
Other comprehensive income (loss) before reclassification |  | (1,029) |  |  | (530) |  |  | (1,559) |
Amounts reclassified from accumulated other comprehensive income (loss) |  | — |  |  | 690 |  |  | 690 |
Net current period other comprehensive loss |  | (1,029) |  |  | 160 |  |  | (869) |
Balance at December 31, 2018 |  | $ | (4,646) |  |  | $ | (6,765) |  |  | $ | (11,411) |
Reclassification Out of Accumulated Other Comprehensive Income | The following is the reclassification out of accumulated other comprehensive income (loss) for the periods indicated (in thousands):
Details about Accumulated Other Comprehensive Income (Loss) Components |  | Year Ended December 31, |  | Affected Line Item in the Statement Where Net Income is Presented
|  | 2020 |  | 2019 |  | 2018 |  |
Unrealized gains and losses on securities available for sale: |  |  |  |  |  |  |  |
Realized gains on securities available for sale |  | $ | — |  |  | $ | (19) |  |  | $ | — |  |  | Net gains on securities transactions
Tax effect |  | — |  |  | 5 |  |  | — |  |  | Income tax expense
Net of tax |  | — |  |  | (14) |  |  | — |  |  |
Amortization of defined pension plan and other benefit plan items: |  |  |  |  |  |  |  |
Prior service costs (a) |  | (220) |  |  | (220) |  |  | (220) |  |  | Other components of net periodic pension and postretirement benefits
Actuarial losses (a) |  | 300 |  |  | 312 |  |  | 1,146 |  |  | Other components of net periodic pension and postretirement benefits
Tax effect |  | (15) |  |  | (27) |  |  | (236) |  |  | Income tax expense
Net of tax |  | 65 |  |  | 65 |  |  | 690 |  |  |
Total reclassification for the period, net of tax |  | $ | 65 |  |  | $ | 51 |  |  | $ | 690 |  |  |
(a) These accumulated other comprehensive income (loss) components are included in the computation of net periodic pension and other benefit plan costs (see Note 14 for additional information).

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + Details
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