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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) | 12 Months Ended
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Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax. |
Schedule of components of other comprehensive income (loss) |
|  | Before Tax |  | Tax Effect |  | Net of Tax |
|  | (Dollars in thousands) |
Year Ended December 31, 2014 |  |  |  |  |  |  |
Net unrealized gains on investment securities: |  |  |  |  |  |  |
Net unrealized gains arising during the period |  | $ | 36,780 |  | $ | 14,714 |  | $ | 22,066 |
Less: Reclassification adjustment for losses realized in net income |  | 1,071 |  | 426 |  | 645 |
Net unrealized gains on investment securities |  | 37,851 |  | 15,140 |  | 22,711 |
Defined benefit plans: |  |  |  |  |  |  |
Net actuarial losses arising during the period |  | (7,409 | ) | (3,052 | ) | (4,357 | )
Amortization of net actuarial losses |  | 1,070 |  | 441 |  | 629 |
Amortization of net transition obligation |  | 17 |  | 7 |  | 10 |
Amortization of prior service cost |  | 18 |  | 7 |  | 11 |
Defined benefit plans, net |  | (6,304 | ) | (2,597 | ) | (3,707 | )
Other comprehensive income |  | $ | 31,547 |  | $ | 12,543 |  | $ | 19,004 |
Year Ended December 31, 2013 |  |  |  |  |  |  |
Net unrealized losses on investment securities: |  |  |  |  |  |  |
Net unrealized losses arising during the period |  | $ | (43,687 | ) | $ | (15,577 | ) | $ | (28,110 | )
Less: Reclassification adjustment for gains realized in net income |  | (6,266 | ) | (2,511 | ) | (3,755 | )
Net unrealized losses on investment securities |  | (49,953 | ) | (18,088 | ) | (31,865 | )
Net unrealized gains on derivatives: |  |  |  |  |  |  |
Reclassification adjustment for losses realized in net income |  | 394 |  | (10,599 | ) | 10,993 |
Net unrealized gains on derivatives |  | 394 |  | (10,599 | ) | 10,993 |
Defined benefit plans: |  |  |  |  |  |  |
Net actuarial gains arising during the period |  | 6,952 |  | 2,591 |  | 4,361 |
Amortization of net actuarial losses |  | 2,461 |  | 986 |  | 1,475 |
Amortization of net transition obligation |  | 17 |  | 7 |  | 10 |
Amortization of prior service cost |  | 18 |  | 7 |  | 11 |
Defined benefit plans, net |  | 9,448 |  | 3,591 |  | 5,857 |
Other comprehensive loss |  | $ | (40,111 | ) | $ | (25,096 | ) | $ | (15,015 | )
|  | Before Tax |  | Tax Effect |  | Net of Tax |
|  | (Dollars in thousands) |
Year Ended December 31, 2012 |  |  |  |  |  |  |
Net unrealized losses on investment securities: |  |  |  |  |  |  |
Net unrealized losses arising during the period |  | $ | (2,653 | ) | $ | — |  | $ | (2,653 | )
Less: Reclassification adjustment for losses realized in net income |  | 1,382 |  | — |  | 1,382 |
Net unrealized losses on investment securities |  | (1,271 | ) | — |  | (1,271 | )
Net unrealized losses on derivatives: |  |  |  |  |  |  |
Reclassification adjustment for gains realized in net income |  | (434 | ) | — |  | (434 | )
Net unrealized losses on derivatives |  | (434 | ) | — |  | (434 | )
Defined benefit plans: |  |  |  |  |  |  |
Net actuarial losses arising during the period |  | (3,653 | ) | — |  | (3,653 | )
Amortization of net actuarial losses |  | 2,381 |  | 51 |  | 2,330 |
Amortization of net transition obligation |  | 17 |  | — |  | 17 |
Amortization of prior service cost |  | 17 |  | — |  | 17 |
Defined benefit plans, net |  | (1,238 | ) | 51 |  | (1,289 | )
Other comprehensive loss |  | $ | (2,943 | ) | $ | 51 |  | $ | (2,994 | )
Schedule of changes in each component of AOCI, net of tax |
|  |  |  |  |  | Defined |  | Accumulated Other |
|  | Investment |  |  |  | Benefit |  | Comprehensive |
|  | Securities |  | Derivatives |  | Plans |  | Income (Loss) |
|  | (Dollars in thousands) |
Year Ended December 31, 2014 |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | (9,125 | ) | $ | — |  | $ | (6,720 | ) | $ | (15,845 | )
Other comprehensive income (loss) before reclassifications |  | 22,066 |  | — |  | (4,357 | ) | 17,709 |
Amounts reclassified from AOCI |  | 645 |  | — |  | 650 |  | 1,295 |
Total other comprehensive income (loss) |  | 22,711 |  | — |  | (3,707 | ) | 19,004 |
Balance at end of period |  | $ | 13,586 |  | $ | — |  | $ | (10,427 | ) | $ | 3,159 |
Year Ended December 31, 2013 |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | 22,740 |  | $ | (10,993 | ) | $ | (12,577 | ) | $ | (830 | )
Other comprehensive income (loss) before reclassifications |  | (28,110 | ) | — |  | 4,361 |  | (23,749 | )
Amounts reclassified from AOCI |  | (3,755 | ) | 10,993 |  | 1,496 |  | 8,734 |
Total other comprehensive income (loss) |  | (31,865 | ) | 10,993 |  | 5,857 |  | (15,015 | )
Balance at end of period |  | $ | (9,125 | ) | $ | — |  | $ | (6,720 | ) | $ | (15,845 | )
Year Ended December 31, 2012 |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | 24,011 |  | $ | (10,559 | ) | $ | (11,288 | ) | $ | 2,164 |
Other comprehensive loss before reclassifications |  | (2,653 | ) | — |  | (3,653 | ) | (6,306 | )
Amounts reclassified from AOCI |  | 1,382 |  | (434 | ) | 2,364 |  | 3,312 |
Total other comprehensive loss |  | (1,271 | ) | (434 | ) | (1,289 | ) | (2,994 | )
Balance at end of period |  | $ | 22,740 |  | $ | (10,993 | ) | $ | (12,577 | ) | $ | (830 | )
Schedule of amounts reclassified out of each component of AOCI |
|  | Amount Reclassified from AOCI |  | Affected Line Item in the |
Details about AOCI Components |  | Year ended December 31, |  | Statement Where Net |
(Dollars in thousands) |  | 2014 |  | 2013 |  | 2012 |  | Income is Presented |
Sale of investment securities available for sale |  | $ | (1,071 | ) | $ | 6,266 |  | $ | (1,382 | ) | Investment securities gains |
|  | 426 |  | (2,511 | ) | — |  | Tax (expense) benefit |
|  | $ | (645 | ) | $ | 3,755 |  | $ | (1,382 | ) | Net of tax |
Unrealized gains (losses) on derivatives |  | $ | — |  | $ | (394 | ) | $ | 434 |  | Interest income |
|  | — |  | (10,599 | ) | — |  | Tax expense |
|  | $ | — |  | $ | (10,993 | ) | $ | 434 |  | Net of tax |
Amortization of defined benefit plan items |  |  |  |  |  |  |  |  |
Net actuarial losses |  | $ | (1,070 | ) | $ | (2,461 | ) | $ | (2,381 | ) | (1) |
Net transition obligation |  | (17 | ) | (17 | ) | (17 | ) | (1) |
Prior service cost |  | (18 | ) | (18 | ) | (17 | ) | (1) |
|  | (1,105 | ) | (2,496 | ) | (2,415 | ) | Total before tax |
|  | 455 |  | 1,000 |  | 51 |  | Tax benefit |
|  | $ | (650 | ) | $ | (1,496 | ) | $ | (2,364 | ) | Net of tax |
Total reclassifications for the period |  | $ | (1,295 | ) | $ | (8,734 | ) | $ | (3,312 | ) | Net of tax |
(1) These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see Note 16 for additional details).

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 + Details
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- Definition Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e526-108580 + Details
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