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OTHER COMPREHENSIVE INCOME (LOSS): (Tables) | 12 Months Ended
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Dec. 31, 2019
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) | The following table summarizes the changes, net of tax within each classification of accumulated other comprehensive income for the years ended December 31, 2019 and 2018.
|  | Unrealized |  |  |  |
|  | gains and |  | 2019
|  | Losses on available- for-sale |  | Retirement |  |
(Dollar amounts in thousands) |  | Securities |  | plans |  | Total
Beginning balance, January 1 |  | $ | (6,105 | ) |  | $ | (17,349 | ) |  | $ | (23,454 | )
Change in other comprehensive income before reclassification |  | 21,031 |  |  | (6,213 | ) |  | 14,818 |
Amounts reclassified from accumulated other comprehensive income |  | (33 | ) |  | 1,168 |  |  | 1,135 |
Net current period other comprehensive income (loss) |  | 20,998 |  |  | (5,045 | ) |  | 15,953 |
ASU 2018-02 adjustment |  | $ | — |  |  | $ | — |  |  | $ | — |
Ending balance, December 31 |  | $ | 14,893 |  |  | $ | (22,394 | ) |  | $ | (7,501 | )
|  | Unrealized |  |  |  |
|  | gains and |  | 2018
|  | Losses on available- for-sale |  | Retirement |  |
(Dollar amounts in thousands) |  | Securities |  | plans |  | Total
Beginning balance, January 1 |  | $ | 2,258 |  |  | $ | (16,962 | ) |  | $ | (14,704 | )
Change in other comprehensive income before reclassification |  | (8,859 | ) |  | 1,392 |  |  | (7,467 | )
Amounts reclassified from accumulated other comprehensive income |  | (2 | ) |  | 1,085 |  |  | 1,083 |
Net current period other comprehensive income (loss) |  | (8,861 | ) |  | 2,477 |  |  | (6,384 | )
ASU 2018-02 adjustment |  | $ | 498 |  |  | $ | (2,864 | ) |  | $ | (2,366 | )
Ending balance, December 31 |  | $ | (6,105 | ) |  | $ | (17,349 | ) |  | $ | (23,454 | )
|  | Balance at |  | Current Period |  | Balance at
(Dollar amounts in thousands) |  | 1/1/2019 |  | Change |  | 12/31/2019
Unrealized gains (losses) on securities available-for-sale |  |  |  |  |  |
without other than temporary impairment |  | $ | (8,446 | ) |  | $ | 20,624 |  |  | $ | 12,178 |
Unrealized gains (losses) on securities available-for-sale |  |  |  |  |  |  |  |  |
with other than temporary impairment |  | 2,341 |  |  | 374 |  |  | 2,715 |
Total unrealized gain (loss) on securities available-for-sale |  | $ | (6,105 | ) |  | $ | 20,998 |  |  | $ | 14,893 |
Unrealized loss on retirement plans |  | (17,349 | ) |  | (5,045 | ) |  | (22,394 | )
TOTAL |  | $ | (23,454 | ) |  | $ | 15,953 |  |  | $ | (7,501 | )
|  | Balance at |  | Current Period |  | Balance at
(Dollar amounts in thousands) |  | 1/1/2018 |  | Change |  | 12/31/2018
Unrealized gains (losses) on securities available-for-sale |  |  |  |  |  |  |  |  |
without other than temporary impairment |  | $ | (1,371 | ) |  | $ | (7,075 | ) |  | $ | (8,446 | )
Unrealized gains (losses) on securities available-for-sale |  |  |  |  |  |  |  |  |
with other than temporary impairment |  | 3,629 |  |  | (1,288 | ) |  | 2,341 |
Total unrealized gain (loss) on securities available-for-sale |  | $ | 2,258 |  |  | $ | (8,363 | ) |  | $ | (6,105 | )
Unrealized loss on retirement plans |  | (16,962 | ) |  | (387 | ) |  | (17,349 | )
TOTAL |  | $ | (14,704 | ) |  | $ | (8,750 | ) |  | $ | (23,454 | )
Reclassification out of Accumulated Other Comprehensive Income |
|  | Balance at December 31, 2019 |  |
Details about accumulated |  | Amount reclassified from |  | Affected line item in
other comprehensive |  | accumulated other |  | the statement where
income components |  | comprehensive income |  | net income is presented
|  | (in thousands) |  |
Unrealized gains and losses |  | $ | 44 |  |  | Net securities gains (losses)
on available-for-sale |  | (11 | ) |  | Income tax expense
securities |  | $ | 33 |  |  | Net of tax
Amortization of |  | $ | (1,558 | ) |  | (a)
retirement plan items |  | 390 |  |  | Income tax expense
|  | $ | (1,168 | ) |  | Net of tax
Total reclassifications for the period |  | $ | (1,135 | ) |  | Net of tax
(a) Included in the computation of net periodic benefit cost which is included in salaries and benefits. (see Footnote 16 for additional details).
|  | Balance at December 31, 2018 |  |
Details about accumulated |  | Amount reclassified from |  | Affected line item in
other comprehensive |  | accumulated other |  | the statement where
income components |  | comprehensive income |  | net income is presented
|  | (in thousands) |  |
Unrealized gains and losses |  | $ | 2 |  |  | Net securities gains (losses)
on available-for-sale |  | — |  |  | Income tax expense
securities |  | $ | 2 |  |  | Net of tax
Amortization of |  | $ | (1,447 | ) |  | (a)
retirement plan items |  | 362 |  |  | Income tax expense
|  | $ | (1,085 | ) |  | Net of tax
Total reclassifications for the period |  | $ | (1,083 | ) |  | Net of tax
(a) Included in the computation of net periodic benefit cost which is included in salaries and benefits. (see Footnote 16 for additional details).
|  | Balance at December 31, 2017 |  |
Details about accumulated |  | Amount reclassified from |  | Affected line item in
other comprehensive |  | accumulated other |  | the statement where
income components |  | comprehensive income |  | net income is presented
|  | (in thousands) |  |
Unrealized gains and losses |  | $ | 59 |  |  | Net securities gains (losses)
on available-for-sale |  | (23 | ) |  | Income tax expense
securities |  | $ | 36 |  |  | Net of tax
Amortization of |  | $ | (1,204 | ) |  | (a)
retirement plan items |  | 470 |  |  | Income tax expense
|  | $ | (734 | ) |  | Net of tax
Total reclassifications for the period |  | $ | (698 | ) |  | Net of tax
(a) Included in the computation of net periodic benefit cost which is included in salaries and benefits. (see Footnote 16 for additional details).

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