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Supplemental Comprehensive Income Disclosures (Tables) | 3 Months Ended
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Mar. 31, 2018
Supplemental Comprehensive Income Disclosures [Abstract] |
Supplemental Comprehensive Income Disclosures | The following table identifies the related tax effects allocated to each component of other comprehensive income (“OCI”) in the Condensed Consolidated Statements of Comprehensive Income. Reclassification adjustments related to securities available for sale are included in the "Net securities gains" line and reclassification adjustments related to losses on derivatives are included in the "Other operating expenses" line in the Condensed Consolidated Statements of Income.
| For the Three Months Ended March 31,
| 2018 |  | 2017
| Pretax Amount |  | Tax (Expense) Benefit |  | Net of Tax Amount |  | Pretax Amount |  | Tax (Expense) Benefit |  | Net of Tax Amount
| (dollars in thousands)
Unrealized (losses) gains on securities: |  |  |  |  |  |  |  |  |  |  |
Unrealized holding (losses) gains on securities arising during the period | $ | (3,982 | ) |  | $ | 837 |  |  | $ | (3,145 | ) |  | $ | 2,543 |  |  | $ | (890 | ) |  | $ | 1,653 |
Reclassification adjustment for gains on securities included in net income | (2,840 | ) |  | 596 |  |  | (2,244 | ) |  | (652 | ) |  | 228 |  |  | (424 | )
Total unrealized (losses) gains on securities | (6,822 | ) |  | 1,433 |  |  | (5,389 | ) |  | 1,891 |  |  | (662 | ) |  | 1,229 |
Unrealized losses on derivatives: |  |  |  |  |  |  |  |  |  |  |
Unrealized holding losses on derivatives arising during the period | (130 | ) |  | 27 |  |  | (103 | ) |  | (516 | ) |  | 181 |  |  | (335 | )
Reclassification adjustment for losses on derivatives included in net income | — |  |  | — |  |  | — |  |  | 78 |  |  | (28 | ) |  | 50 |
Total unrealized losses on derivatives | (130 | ) |  | 27 |  |  | (103 | ) |  | (438 | ) |  | 153 |  |  | (285 | )
Total other comprehensive (loss) income | $ | (6,952 | ) |  | $ | 1,460 |  |  | $ | (5,492 | ) |  | $ | 1,453 |  |  | $ | (509 | ) |  | $ | 944 |
Schedule of Accumulated Other Comprehensive Income (Loss) | The following table details the change in components of OCI for the three months ended March 31:
| 2018 |  | 2017
| Securities Available for Sale | Post-Retirement Obligation | Derivatives | Accumulated Other Comprehensive Income (Loss) |  | Securities Available for Sale | Post-Retirement Obligation | Derivatives | Accumulated Other Comprehensive Income (Loss)
| (dollars in thousands)
Balance at December 31 | $ | (6,166 | ) | $ | 299 |  | $ | (306 | ) | $ | (6,173 | ) |  | $ | (7,455 | ) | $ | 225 |  | $ | 203 |  | $ | (7,027 | )
Cumulative effect of adoption of ASU 2018-02 | (1,344 | ) | — |  | — |  | (1,344 | ) |  | — |  | — |  | — |  | — |
Balance at January 1 | (7,510 | ) | 299 |  | (306 | ) | (7,517 | ) |  | (7,455 | ) | 225 |  | 203 |  | (7,027 | )
Other comprehensive (loss) income before reclassification adjustment | (3,145 | ) | — |  | (103 | ) | (3,248 | ) |  | 1,653 |  | — |  | (335 | ) | 1,318 |
Amounts reclassified from accumulated other comprehensive (loss) income | (2,244 | ) | — |  | — |  | (2,244 | ) |  | (424 | ) | — |  | 50 |  | (374 | )
Net other comprehensive (loss) income during the period | (5,389 | ) | — |  | (103 | ) | (5,492 | ) |  | 1,229 |  | — |  | (285 | ) | 944 |
Balance at March 31 | $ | (12,899 | ) | $ | 299 |  | $ | (409 | ) | $ | (13,009 | ) |  | $ | (6,226 | ) | $ | 225 |  | $ | (82 | ) | $ | (6,083 | )

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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=84228862&loc=SL7669686-108580 + Details
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- Definition Tabular disclosure of the net gain (loss) and net prior service cost or credit recognized in other comprehensive income (loss) for the period for pension plans and/or other employee benefit plans, and reclassification adjustments of other comprehensive income (loss) for the period, as those amounts, including amortization of the net transition asset or obligation, are recognized as components of net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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