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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) | 12 Months Ended
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Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) | ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) The following table presents the components of other comprehensive income (loss) for the years ended December 31, 2015, 2014 and 2013, by component:
| Before Tax |  | Tax Effect |  | Net of Tax
| (Dollars in thousands)
Year ended December 31, 2015 |  |  |  |  |  |  |  |
Net unrealized losses on investment securities: |  |  |  |  |  |  |  |
Net unrealized losses arising during the period | $ | (9,184 | ) |  | $ | (3,655 | ) |  | $ | (5,529 | )
Less: Reclassification adjustment for losses realized in net income | 1,866 |  |  | 742 |  |  | 1,124 |
Net unrealized losses on investment securities | (7,318 | ) |  | (2,913 | ) |  | (4,405 | )
Defined benefit plans: |  |  |  |  |  |  |  |
Net actuarial gains arising during the period | 687 |  |  | 274 |  |  | 413 |
Amortization of net actuarial losses | 1,688 |  |  | 672 |  |  | 1,016 |
Amortization of net transition obligation | 16 |  |  | 7 |  |  | 9 |
Amortization of prior service cost | 18 |  |  | 7 |  |  | 11 |
Defined benefit plans, net | 2,409 |  |  | 960 |  |  | 1,449 |
Other comprehensive income | $ | (4,909 | ) |  | $ | (1,953 | ) |  | $ | (2,956 | )
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 | )
| Before Tax |  | Tax Effect |  | Net of Tax
| (Dollars in thousands)
Net unrealized losses on investment securities | (49,953 | ) |  | (18,088 | ) |  | (31,865 | )
Net unrealized losses on derivatives: |  |  |  |  |  |  |  |
Reclassification adjustment for losses realized in net income | 394 |  |  | (10,599 | ) |  | 10,993 |
Net unrealized losses 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 | )
The following table presents the changes in each component of AOCI, net of tax, for the years ended December 31, 2015, 2014 and 2013:
| Investment Securities |  | Derivatives |  | Defined Benefit Plans |  | Accumulated Other Comprehensive Income (Loss)
| (Dollars in thousands)
Year ended December 31, 2015 |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | 13,586 |  |  | $ | — |  |  | $ | (10,427 | ) |  | $ | 3,159 |
Other comprehensive income (loss) before reclassifications | (5,529 | ) |  | — |  |  | 413 |  |  | (5,116 | )
Amounts reclassified from AOCI | 1,124 |  |  | — |  |  | 1,036 |  |  | 2,160 |
Total other comprehensive income (loss) | (4,405 | ) |  | — |  |  | 1,449 |  |  | (2,956 | )
Balance at end of period | $ | 9,181 |  |  | $ | — |  |  | $ | (8,978 | ) |  | $ | 203 |
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 loss before reclassifications | (28,110 | ) |  | — |  |  | 4,361 |  |  | (23,749 | )
Amounts reclassified from AOCI | (3,755 | ) |  | 10,993 |  |  | 1,496 |  |  | 8,734 |
Total other comprehensive loss | (31,865 | ) |  | 10,993 |  |  | 5,857 |  |  | (15,015 | )
Balance at end of period | $ | (9,125 | ) |  | $ | — |  |  | $ | (6,720 | ) |  | $ | (15,845 | )
The following table presents the amounts reclassified out of each component of AOCI for the years ended December 31, 2015, 2014 and 2013:
| Amount Reclassified from AOCI |  | Affected Line Item in the
Details about AOCI Components (Dollars in Thousands) | Year ended December 31, |  | Statement Where Net
2015 |  | 2014 |  | 2013 |  | Income is Presented
Sale of investment securities available for sale | $ | (1,866 | ) |  | $ | (1,071 | ) |  | $ | 6,266 |  |  | Investment securities gains (losses)
| 742 |  |  | 426 |  |  | (2,511 | ) |  | Tax (expense) benefit
| $ | (1,124 | ) |  | $ | (645 | ) |  | $ | 3,755 |  |  | Net of tax
Unrealized gains (losses) on derivatives | $ | — |  |  | $ | — |  |  | $ | (394 | ) |  | Interest income
| — |  |  | — |  |  | (10,599 | ) |  | Tax expense
| $ | — |  |  | $ | — |  |  | $ | (10,993 | ) |  | Net of tax
Amortization of defined benefit plan items |  |  |  |  |  |  |  |  |  |
Net actuarial losses | $ | (1,688 | ) |  | $ | (1,070 | ) |  | $ | (2,461 | ) |  | (1)
Net transition obligation | (16 | ) |  | (17 | ) |  | (17 | ) |  | (1)
Prior service cost | (18 | ) |  | (18 | ) |  | (18 | ) |  | (1)
| (1,722 | ) |  | (1,105 | ) |  | (2,496 | ) |  | Total before tax
| 686 |  |  | 455 |  |  | 1,000 |  |  | Tax benefit
| $ | (1,036 | ) |  | $ | (650 | ) |  | $ | (1,496 | ) |  | Net of tax
Total reclassifications for the period | $ | (2,160 | ) |  | $ | (1,295 | ) |  | $ | (8,734 | ) |  | Net of tax
(1) | These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see Note 15 for additional details).

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e689-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669619-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e640-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e716-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e709-108580 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Reclassification Adjustments -URI http://asc.fasb.org/extlink&oid=6522872 + Details
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