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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) | 3 Months Ended
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Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of components of other comprehensive income (loss) | The following tables present the components of other comprehensive income for the three months ended March 31, 2017 and 2016, by component:
(dollars in thousands) | Before Tax |  | Tax Effect |  | Net of Tax
Three Months Ended March 31, 2017 |  |  |  |  |  |  |  |
Net unrealized gains on investment securities: |  |  |  |  |  |  |  |
Net unrealized gains arising during the period | $ | 3,527 |  |  | $ | 1,403 |  |  | $ | 2,124 |
Less: Reclassification adjustment for gains realized in net income | — |  |  | — |  |  | — |
Net unrealized gains on investment securities | 3,527 |  |  | 1,403 |  |  | 2,124 |
Defined benefit plans: |  |  |  |  |  |  |  |
Net actuarial losses arising during the period | (1,042 | ) |  | (415 | ) |  | (627 | )
Amortization of net actuarial loss | 421 |  |  | 164 |  |  | 257 |
Amortization of net transition obligation | 4 |  |  | 1 |  |  | 3 |
Amortization of prior service cost | 4 |  |  | 1 |  |  | 3 |
Defined benefit plans, net | (613 | ) |  | (249 | ) |  | (364 | )
Other comprehensive income | $ | 2,914 |  |  | $ | 1,154 |  |  | $ | 1,760 |
(dollars in thousands) | Before Tax |  | Tax Effect |  | Net of Tax
Three Months Ended March 31, 2016 |  |  |  |  |  |  |  |
Net unrealized gains on investment securities: |  |  |  |  |  |  |  |
Net unrealized gains arising during the period | $ | 19,683 |  |  | $ | 7,830 |  |  | $ | 11,853 |
Less: Reclassification adjustment for losses realized in net income | — |  |  | — |  |  | — |
Net unrealized gains on investment securities | 19,683 |  |  | 7,830 |  |  | 11,853 |
Defined benefit plans: |  |  |  |  |  |  |  |
Amortization of net actuarial loss | 367 |  |  | 124 |  |  | 243 |
Amortization of net transition obligation | 4 |  |  | 1 |  |  | 3 |
Amortization of prior service cost | 5 |  |  | 1 |  |  | 4 |
Defined benefit plans, net | 376 |  |  | 126 |  |  | 250 |
Other comprehensive inco me | $ | 20,059 |  |  | $ | 7,956 |  |  | $ | 12,103 |
Schedule of changes in each component of AOCI, net of tax | The following tables present the changes in each component of AOCI, net of tax, for the three months ended March 31, 2017 and 2016:
(dollars in thousands) | Investment Securities |  | Defined Benefit Plans |  | Accumulated Other Comprehensive Income
Three Months Ended March 31, 2017 |  |  |  |  |  |  |  |
Balance at beginning of period | $ | 4,729 |  |  | $ | (6,250 | ) |  | $ | (1,521 | )
Other comprehensive income before reclassificatio ns | 2,124 |  |  | (627 | ) |  | 1,497 |
Amounts reclassified from AOCI | — |  |  | 263 |  |  | 263 |
Total other comprehensive income (loss) | 2,124 |  |  | (364 | ) |  | 1,760 |
Balance at end of period | $ | 6,853 |  |  | $ | (6,614 | ) |  | $ | 239 |
(dollars in thousands) | Investment Securities |  | Defined Benefit Plans |  | Accumulated Other Comprehensive Income
Three Months Ended March 31, 2016 |  |  |  |  |  |  |  |
Balance at beginning of period | $ | 9,181 |  |  | $ | (8,978 | ) |  | $ | 203 |
Other comprehensive income before reclassifications | 11,853 |  |  | — |  |  | 11,853 |
Amounts reclassified from AOCI | — |  |  | 250 |  |  | 250 |
Total other comprehensive income | 11,853 |  |  | 250 |  |  | 12,103 |
Balance at end of period | $ | 21,034 |  |  | $ | (8,728 | ) |  | $ | 12,306 |
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 three months ended March 31, 2017 and 2016:
| Amount Reclassified from AOCI |  | Affected Line Item in the Statement Where Net Income is Presented
Details about AOCI Components | Three months ended March 31, |
(dollars in thousands) | 2017 |  | 2016 |
Amortization of defined benefit retirement and supplemental executive retirement plan items |  |  |  |  |  |  |
Net actuarial loss | $ | (421 | ) |  | $ | (367 | ) |  | (1)
Net transition obligation | (4 | ) |  | (4 | ) |  | (1)
Prior service cost | (4 | ) |  | (5 | ) |  | (1)
| (429 | ) |  | (376 | ) |  | Total before tax
| 166 |  |  | 126 |  |  | Tax benefit
Total reclassifications for the period | $ | (263 | ) |  | $ | (250 | ) |  | Net of tax
(1) | These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see Note 14 - Pension and Supplemental Executive Retirement Plans for additional details).

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