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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) | 12 Months Ended
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Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of components of 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 | )
Schedule of changes in each component of AOCI, net of tax | 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 | )
Schedule of amounts reclassified out of each component of AOCI | 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

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