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Components of Other Comprehensive Income/(Loss) (Tables) | 12 Months Ended
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Dec. 31, 2017
Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Accumulated Other Comprehensive Income/(Loss) | The following table provides the changes in accumulated other comprehensive income/(loss) by component, net of tax, for the years ended December 31, 2017, 2016, and 2015:
(Dollars in thousands) |  | Securities AFS |  | Cash Flow Hedges |  | Pension and Post-retirement Plans |  | Total
Balance as of December 31, 2014 |  | $ | 18,581 |  |  | $ | — |  |  | $ | (206,827 | ) |  | $ | (188,246 | )
Net unrealized gains/(losses) |  | (14,055 | ) |  | — |  |  | (11,117 | ) |  | (25,172 | )
Amounts reclassified from AOCI |  | (1,132 | ) |  | — |  |  | 358 |  |  | (774 | )
Other comprehensive income/(loss) |  | (15,187 | ) |  | — |  |  | (10,759 | ) |  | (25,946 | )
Balance as of December 31, 2015 |  | 3,394 |  |  | — |  |  | (217,586 | ) |  | (214,192 | )
Net unrealized gains/(losses) |  | (19,709 | ) |  | 130 |  |  | (16,322 | ) |  | (35,901 | )
Amounts reclassified from AOCI |  | (917 | ) |  | (1,395 | ) |  | 4,751 |  |  | 2,439 |
Other comprehensive income/(loss) |  | (20,626 | ) |  | (1,265 | ) |  | (11,571 | ) |  | (33,462 | )
Balance as of December 31, 2016 |  | (17,232 | ) |  | (1,265 | ) |  | (229,157 | ) |  | (247,654 | )
Net unrealized gains/(losses) |  | (4,467 | ) |  | (2,156 | ) |  | (13,377 | ) |  | (20,000 | )
Amounts reclassified from AOCI |  | (298 | ) |  | (2,945 | ) |  | 5,618 |  |  | 2,375 |
Other comprehensive income/(loss) |  | (4,765 | ) |  | (5,101 | ) |  | (7,759 | ) |  | (17,625 | )
Balance as of December 31, 2017 |  | (21,997 | ) |  | (6,366 | ) |  | (236,916 | ) |  | (265,279 | )
Adjustment to reflect adoption of ASU 2018-02 |  | (4,837 | ) |  | (1,398 | ) |  | (51,311 | ) |  | (57,546 | )
Ending balance, as adjusted |  | $ | (26,834 | ) |  | $ | (7,764 | ) |  | $ | (288,227 | ) |  | $ | (322,825 | )
Reclassification Out Of Accumulated Other Comprehensive Income | Reclassifications from AOCI, and related tax effects, were as follows:
(Dollars in thousands) |  |  |  |
Details about AOCI |  | 2017 |  | 2016 |  | 2015 |  | Affected line item in the statement where net income is presented
Securities AFS: |  |  |  |  |  |  |  |
Realized (gains)/losses on securities AFS |  | $ | (483 | ) |  | $ | (1,485 | ) |  | $ | (1,836 | ) |  | Debt securities gains/(losses), net
Tax expense/(benefit) |  | 185 |  |  | 568 |  |  | 704 |  |  | Provision/(benefit) for income taxes
|  | (298 | ) |  | (917 | ) |  | (1,132 | ) |  |
Cash flow hedges: |  |  |  |  |  |  |  |
Realized (gains)/losses on cash flow hedges |  | (4,771 | ) |  | (2,260 | ) |  | — |  |  | Interest and fees on loans
Tax expense/(benefit) |  | 1,826 |  |  | 865 |  |  | — |  |  | Provision/(benefit) for income taxes
|  | (2,945 | ) |  | (1,395 | ) |  | — |  |  |
Pension and Postretirement Plans: |  |  |  |  |  |  |  |
Amortization of prior service cost and net actuarial gain/(loss) |  | 9,101 |  |  | 7,697 |  |  | 580 |  |  | Employee compensation, incentives, and benefits
Tax expense/(benefit) |  | (3,483 | ) |  | (2,946 | ) |  | (222 | ) |  | Provision/(benefit) for income taxes
|  | 5,618 |  |  | 4,751 |  |  | 358 |  |  |
Total reclassification from AOCI |  | $ | 2,375 |  |  | $ | 2,439 |  |  | $ | (774 | ) |  |

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- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + Details
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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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