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Supplemental Comprehensive Income Disclosures (Tables) | 12 Months Ended
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Dec. 31, 2015
Supplemental Comprehensive Income Disclosures [Abstract] |
Schedule of Amounts Recognized in Accumulated Other Comprehensive Income | The following table identifies the related tax effects allocated to each component of other comprehensive income in the Consolidated Statements of Comprehensive Income as of December 31. Reclassification adjustments related to securities available for sale are included in the “Net securities gains” line in the Consolidated Statements of Income and reclassification adjustments related to losses on derivatives are included in the "Other operating expenses" line in the Consolidated Statements of Income.
| 2015 |  | 2014 |  | 2013
| Pretax Amount |  | Tax (Expense) Benefit |  | Net of Tax Amount |  | Pretax Amount |  | Tax (Expense) Benefit |  | Net of Tax Amount |  | Pretax Amount |  | Tax (Expense) Benefit |  | Net of Tax Amount
| (dollars in thousands)
Unrealized gains (losses) on securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized holding gains (losses) on securities arising during the period | $ | 2,798 |  |  | $ | (978 | ) |  | $ | 1,820 |  |  | $ | 25,153 |  |  | $ | (8,803 | ) |  | $ | 16,350 |  |  | $ | (34,975 | ) |  | $ | 12,233 |  |  | $ | (22,742 | )
Reclassification adjustment for losses (gains) on securities included in net income | 153 |  |  | (54 | ) |  | 99 |  |  | (550 | ) |  | 193 |  |  | (357 | ) |  | 1,158 |  |  | (405 | ) |  | 753 |
Total unrealized gains (losses) on securities | 2,951 |  |  | (1,032 | ) |  | 1,919 |  |  | 24,603 |  |  | (8,610 | ) |  | 15,993 |  |  | (33,817 | ) |  | 11,828 |  |  | (21,989 | )
Unrealized gains (losses) on derivatives: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized holding gains on derivatives arising during the period | 450 |  |  | (158 | ) |  | 292 |  |  | 472 |  |  | (165 | ) |  | 307 |  |  | — |  |  | — |  |  | — |
Reclassification adjustment for gains on derivatives included in net income | (49 | ) |  | 17 |  |  | (32 | ) |  | (10 | ) |  | 3 |  |  | (7 | ) |  | — |  |  | — |  |  | — |
Total unrealized gains on derivatives | 401 |  |  | (141 | ) |  | 260 |  |  | 462 |  |  | (162 | ) |  | 300 |  |  | — |  |  | — |  |  | — |
Unrealized (losses) gains for postretirement obligations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transition obligation | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Net (loss) gain | (102 | ) |  | 36 |  |  | (66 | ) |  | (313 | ) |  | 109 |  |  | (204 | ) |  | 219 |  |  | (77 | ) |  | 142 |
Total unrealized (losses) gains for postretirement obligations | (102 | ) |  | 36 |  |  | (66 | ) |  | (313 | ) |  | 109 |  |  | (204 | ) |  | 219 |  |  | (77 | ) |  | 142 |
Total other comprehensive income (loss) | $ | 3,250 |  |  | $ | (1,137 | ) |  | $ | 2,113 |  |  | $ | 24,752 |  |  | $ | (8,663 | ) |  | $ | 16,089 |  |  | $ | (33,598 | ) |  | $ | 11,751 |  |  | $ | (21,847 | )
The following table sets forth the amounts recognized in accumulated other comprehensive income that have not yet been recognized as components of net periodic benefit costs as of December 31:
| 2015 |  | 2014 |  | 2013
| (dollars in thousands)
Amounts recognized in accumulated other comprehensive income, net of tax: |  |  |  |  |
Net (gain) loss | $ | (10 | ) |  | $ | (76 | ) |  | $ | (280 | )
Transition obligation | — |  |  | — |  |  | — |
Total | $ | (10 | ) |  | $ | (76 | ) |  | $ | (280 | )
Related Tax Effects Allocated to Each Component of Other Comprehensive Income | The following table details the change in components of OCI for the year-ended December 31:
| 2015
| Securities Available for Sale |  | Derivatives |  | Post-Retirement Obligation |  | Accumulated Other Comprehensive Income
| (dollars in thousands)
Balance at January 1 | $ | (4,875 | ) |  | $ | 300 |  |  | $ | 76 |  |  | $ | (4,499 | )
Other comprehensive income before reclassification adjustment | 1,820 |  |  | 292 |  |  |  |  | 2,112 |
Amounts reclassified from accumulated other comprehensive income (loss) | 99 |  |  | (32 | ) |  |  |  | 67 |
Net gain |  |  |  |  | (66 | ) |  | (66 | )
Net other comprehensive income during the period | 1,919 |  |  | 260 |  |  | (66 | ) |  | 2,113 |
Balance at December 31 | $ | (2,956 | ) |  | $ | 560 |  |  | $ | 10 |  |  | $ | (2,386 | )
| 2014
| Securities Available for Sale |  | Derivatives |  | Post-Retirement Obligation |  | Accumulated Other Comprehensive Income
| (dollars in thousands)
Balance at January 1 | $ | (20,868 | ) |  | $ | — |  |  | $ | 280 |  |  | $ | (20,588 | )
Other comprehensive income before reclassification adjustment | 16,350 |  |  | 307 |  |  |  |  | 16,657 |
Amounts reclassified from accumulated other comprehensive income (loss) | (357 | ) |  | (7 | ) |  |  |  | (364 | )
Net gain |  |  |  |  | (204 | ) |  | (204 | )
Net other comprehensive income during the period | 15,993 |  |  | 300 |  |  | (204 | ) |  | 16,089 |
Balance at December 31 | $ | (4,875 | ) |  | $ | 300 |  |  | $ | 76 |  |  | $ | (4,499 | )
| 2013
| Securities Available for Sale |  | Derivatives |  | Post-Retirement Obligation |  | Accumulated Other Comprehensive Income
| (dollars in thousands)
Balance at January 1 | $ | 1,121 |  |  | $ | — |  |  | $ | 138 |  |  | $ | 1,259 |
Other comprehensive income before reclassification adjustment | (22,742 | ) |  | — |  |  |  |  | (22,742 | )
Amounts reclassified from accumulated other comprehensive income (loss) | 753 |  |  | — |  |  |  |  | 753 |
Net gain |  |  |  |  | 142 |  |  | 142 |
Net other comprehensive income during the period | (21,989 | ) |  | — |  |  | 142 |  |  | (21,847 | )
Balance at December 31 | $ | (20,868 | ) |  | $ | — |  |  | $ | 280 |  |  | $ | (20,588 | )

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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=36458714&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=35743120&loc=d3e1928-114920 + Details
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