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OTHER COMPREHENSIVE INCOME (LOSS): (Tables) | 12 Months Ended
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Dec. 31, 2015
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, 2015 and 2014.
|  | Unrealized |  |  |  |
|  | gains and |  | 2015
|  | Losses on available- for-sale |  | Retirement |  |
(Dollar amounts in thousands) |  | Securities |  | plans |  | Total
Beginning balance, January 1 |  | $ | 10,278 |  |  | $ | (24,807 | ) |  | $ | (14,529 | )
Change in other comprehensive income before reclassification |  | (1,214 | ) |  | 1,433 |  |  | 219 |
Amounts reclassified from accumulated other comprehensive income |  | (11 | ) |  | 4,920 |  |  | 4,909 |
Net current period other comprehensive income (loss) |  | (1,225 | ) |  | 6,353 |  |  | 5,128 |
Ending balance, December 31 |  | $ | 9,053 |  |  | $ | (18,454 | ) |  | $ | (9,401 | )
|  | Unrealized |  |  |  |
|  | gains and |  | 2014
|  | Losses on available- for-sale |  | Retirement |  |
(Dollar amounts in thousands) |  | Securities |  | plans |  | Total
Beginning balance, January 1 |  | $ | (3,635 | ) |  | $ | (10,334 | ) |  | $ | (13,969 | )
Change in other comprehensive income before reclassification |  | 13,911 |  |  | (14,934 | ) |  | (1,023 | )
Amounts reclassified from accumulated other comprehensive income |  | 2 |  |  | 461 |  |  | 463 |
Net current period other comprehensive income (loss) |  | 13,913 |  |  | (14,473 | ) |  | (560 | )
Ending balance, December 31 |  | $ | 10,278 |  |  | $ | (24,807 | ) |  | $ | (14,529 | )
|  | Balance at |  | Current Period |  | Balance at
(Dollar amounts in thousands) |  | 1/1/2015 |  | Change |  | 12/31/2015
Unrealized gains (losses) on securities available-for-sale |  |  |  |  |  |
without other than temporary impairment |  | $ | 7,164 |  |  | $ | (1,081 | ) |  | $ | 6,083 |
Unrealized gains (losses) on securities available-for-sale |  |  |  |  |  |  |  |  |
with other than temporary impairment |  | 3,114 |  |  | (144 | ) |  | 2,970 |
Total unrealized gain (loss) on securities available-for-sale |  | $ | 10,278 |  |  | $ | (1,225 | ) |  | $ | 9,053 |
Unrealized loss on retirement plans |  | (24,807 | ) |  | 6,353 |  |  | (18,454 | )
TOTAL |  | $ | (14,529 | ) |  | $ | 5,128 |  |  | $ | (9,401 | )
|  | Balance at |  | Current Period |  | Balance at
(Dollar amounts in thousands) |  | 1/1/2014 |  | Change |  | 12/31/2014
Unrealized gains (losses) on securities available-for-sale |  |  |  |  |  |  |  |  |
without other than temporary impairment |  | $ | (2,499 | ) |  | $ | 9,663 |  |  | $ | 7,164 |
Unrealized gains (losses) on securities available-for-sale |  |  |  |  |  |  |  |  |
with other than temporary impairment |  | (1,136 | ) |  | 4,250 |  |  | 3,114 |
Total unrealized gain (loss) on securities available-for-sale |  | $ | (3,635 | ) |  | $ | 13,913 |  |  | $ | 10,278 |
Unrealized loss on retirement plans |  | (10,334 | ) |  | (14,473 | ) |  | (24,807 | )
TOTAL |  | $ | (13,969 | ) |  | $ | (560 | ) |  | $ | (14,529 | )
Reclassification out of Accumulated Other Comprehensive Income |
|  | Balance as of December 31, 2015 |  |
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 |  | $ | 17 |  |  | Net securities gains (losses)
on available-for-sale |  | (6 | ) |  | Income tax expense
securities |  | $ | 11 |  |  | Net of tax
Amortization of |  | $ | (8,066 | ) |  | (a)
retirement plan items |  | 3,146 |  |  | Income tax expense
|  | $ | (4,920 | ) |  | Net of tax
Total reclassifications for the period |  | $ | (4,909 | ) |  | Net of tax
(a) Included in the computation of net periodic benefit cost which is included in salaries and benefits. (see Footnote 15 for additional details).
|  | Balance as of December 31, 2014 |  |
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 |  | $ | (3 | ) |  | Net securities gains (losses)
on available-for-sale |  | 1 |  |  | Income tax expense
securities |  | $ | (2 | ) |  | Net of tax
Amortization of |  | $ | (756 | ) |  | (a)
retirement plan items |  | 295 |  |  | Income tax expense
|  | $ | (461 | ) |  | Net of tax
Total reclassifications for the period |  | $ | (463 | ) |  | Net of tax
(a) Included in the computation of net periodic benefit cost which is included in salaries and benefits. (see Footnote 15 for additional details).
|  | Balance at December 31, 2013 |  |
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 |  | $ | 423 |  |  | Net securities gains (losses)
on available-for-sale |  | (169 | ) |  | Income tax expense
securities |  | $ | 254 |  |  | Net of tax
Amortization of |  | $ | (17,615 | ) |  | (a)
retirement plan items |  | 7,046 |  |  | Income tax expense
|  | $ | (10,569 | ) |  | Net of tax
Total reclassifications for the period |  | $ | (10,315 | ) |  | Net of tax
(a) Included in the computation of net periodic benefit cost which is included in salaries and benefits. (see Footnote 15 for additional details).

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