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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) | 12 Months Ended
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Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of components of other comprehensive income (loss) |
| Before Tax |  | Tax Effect |  | Net of Tax
| (Dollars in thousands)
Year ended December 31, 2016 |  |  |  |  |  |  |  |
Net unrealized losses on investment securities: |  |  |  |  |  |  |  |
Net unrealized losses arising during the period | $ | (7,397 | ) |  | $ | (2,945 | ) |  | $ | (4,452 | )
Less: Reclassification adjustment for losses realized in net income | — |  |  | — |  |  | — |
Net unrealized losses on investment securities | (7,397 | ) |  | (2,945 | ) |  | (4,452 | )
Defined benefit plans: |  |  |  |  |  |  |  |
Net actuarial losses arising during the period | (963 | ) |  | (385 | ) |  | (578 | )
Amortization of net actuarial losses | 1,599 |  |  | 634 |  |  | 965 |
Amortization of net transition obligation | 17 |  |  | 6 |  |  | 11 |
Amortization of prior service cost | 18 |  |  | 7 |  |  | 11 |
Settlement | 3,847 |  |  | 1,528 |  |  | 2,319 |
Defined benefit plans, net | 4,518 |  |  | 1,790 |  |  | 2,728 |
Other comprehensive loss | $ | (2,879 | ) |  | $ | (1,155 | ) |  | $ | (1,724 | )
The following table presents the components of other comprehensive income (loss) for the years ended December 31, 2017, 2016 and 2015, by component:
| Before Tax |  | Tax Effect |  | Net of Tax
| (Dollars in thousands)
Year ended December 31, 2017 |  |  |  |  |  |  |  |
Net unrealized losses on investment securities: |  |  |  |  |  |  |  |
Net unrealized losses arising during the period | $ | (838 | ) |  | $ | (333 | ) |  | $ | (505 | )
Less: Reclassification adjustment for losses realized in net income | 1,410 |  |  | 561 |  |  | 849 |
Net unrealized gains on investment securities | 572 |  |  | 228 |  |  | 344 |
Defined benefit plans: |  |  |  |  |  |  |  |
Net actuarial losses arising during the period | (1,318 | ) |  | (518 | ) |  | (800 | )
Amortization of net actuarial losses | 1,293 |  |  | 460 |  |  | 833 |
Amortization of net transition obligation | 18 |  |  | 7 |  |  | 11 |
Amortization of prior service cost | 18 |  |  | 7 |  |  | 11 |
Settlement | 138 |  |  | 55 |  |  | 83 |
Defined benefit plans, net | 149 |  |  | 11 |  |  | 138 |
Other comprehensive income | $ | 721 |  |  | $ | 239 |  |  | $ | 482 |
| Before Tax |  | Tax Effect |  | Net of Tax
| (Dollars in thousands)
Year ended December 31, 2015 |  |  |  |  |  |  |  |
Net unrealized gains on investment securities: |  |  |  |  |  |  |  |
Net unrealized losses arising during the period | $ | (9,184 | ) |  | $ | (3,655 | ) |  | $ | (5,529 | )
Less: Reclassification adjustment for gains 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 loss | $ | (4,909 | ) |  | $ | (1,953 | ) |  | $ | (2,956 | )
Schedule of changes in each component of AOCI, net of tax |
| Investment Securities |  | 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 |
| Investment Securities |  | Defined Benefit Plans |  | Accumulated Other Comprehensive Income (Loss)
| (Dollars in thousands)
Year ended December 31, 2016 |  |  |  |  |  |  |  |
Balance at beginning of period | $ | 9,181 |  |  | $ | (8,978 | ) |  | $ | 203 |
Other comprehensive income (loss) before reclassifications | (4,452 | ) |  | (578 | ) |  | (5,030 | )
Amounts reclassified from AOCI | — |  |  | 3,306 |  |  | 3,306 |
Total other comprehensive income (loss) | (4,452 | ) |  | 2,728 |  |  | (1,724 | )
Balance at end of period | $ | 4,729 |  |  | $ | (6,250 | ) |  | $ | (1,521 | )
The following table presents the changes in each component of AOCI, net of tax, for the years ended December 31, 2017, 2016 and 2015:
| Investment Securities |  | Defined Benefit Plans |  | Accumulated Other Comprehensive Income (Loss)
| (Dollars in thousands)
Year ended December 31, 2017 |  |  |  |  |  |  |  |
Balance at beginning of period | $ | 4,729 |  |  | $ | (6,250 | ) |  | $ | (1,521 | )
Other comprehensive income (loss) before reclassifications | (505 | ) |  | (800 | ) |  | (1,305 | )
Amounts reclassified from AOCI | 849 |  |  | 938 |  |  | 1,787 |
Total other comprehensive income | 344 |  |  | 138 |  |  | 482 |
Balance at end of period | $ | 5,073 |  |  | $ | (6,112 | ) |  | $ | (1,039 | )
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, 2017, 2016 and 2015:
| Amount Reclassified from AOCI |  | Affected Line Item in the
Details about AOCI Components (Dollars in Thousands) | Year ended December 31, |  | Statement Where Net
2017 |  | 2016 |  | 2015 |  | Income is Presented
Sale of investment securities available for sale | $ | (1,410 | ) |  | $ | — |  |  | $ | (1,866 | ) |  | Investment securities gains (losses)
| 561 |  |  | — |  |  | 742 |  |  | Tax benefit
| $ | (849 | ) |  | $ | — |  |  | $ | (1,124 | ) |  | Net of tax
Defined benefit plan items: |  |  |  |  |  |  |  |  |  |
Amortization of net actuarial losses | $ | (1,293 | ) |  | $ | (1,599 | ) |  | $ | (1,688 | ) |  | (1)
Amortization of net transition obligation | (18 | ) |  | (17 | ) |  | (16 | ) |  | (1)
Amortization of prior service cost | (18 | ) |  | (18 | ) |  | (18 | ) |  | (1)
Settlement | (138 | ) |  | (3,847 | ) |  | — |  |  | (1)
| (1,467 | ) |  | (5,481 | ) |  | (1,722 | ) |  | Total before tax
| 529 |  |  | 2,175 |  |  | 686 |  |  | Tax benefit
| $ | (938 | ) |  | $ | (3,306 | ) |  | $ | (1,036 | ) |  | Net of tax
Total reclassifications for the period | $ | (1,787 | ) |  | $ | (3,306 | ) |  | $ | (2,160 | ) |  | Net of tax

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