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Components of Other Comprehensive Income/(Loss) (Tables) | 6 Months Ended
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Jun. 30, 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 three and six months ended June 30, 2017 and 2016:
(Dollars in thousands) |  | Securities AFS |  | Cash Flow Hedges |  | Pension and Post-retirement Plans |  | Total
Balance as of April 1, 2017 |  | $ | (18,795 | ) |  | $ | (3,179 | ) |  | $ | (227,984 | ) |  | $ | (249,958 | )
Net unrealized gains/(losses) |  | 9,188 |  |  | 3,059 |  |  | — |  |  | 12,247 |
Amounts reclassified from AOCI |  | (250 | ) |  | (904 | ) |  | 1,403 |  |  | 249 |
Other comprehensive income/(loss) |  | 8,938 |  |  | 2,155 |  |  | 1,403 |  |  | 12,496 |
Balance as of June 30, 2017 |  | $ | (9,857 | ) |  | $ | (1,024 | ) |  | $ | (226,581 | ) |  | $ | (237,462 | )
Balance as of January 1, 2017 |  | $ | (17,232 | ) |  | $ | (1,265 | ) |  | $ | (229,157 | ) |  | $ | (247,654 | )
Net unrealized gains/(losses) |  | 7,652 |  |  | 1,997 |  |  | — |  |  | 9,649 |
Amounts reclassified from AOCI |  | (277 | ) |  | (1,756 | ) |  | 2,576 |  |  | 543 |
Other comprehensive income/(loss) |  | 7,375 |  |  | 241 |  |  | 2,576 |  |  | 10,192 |
Balance as of June 30, 2017 |  | $ | (9,857 | ) |  | $ | (1,024 | ) |  | $ | (226,581 | ) |  | $ | (237,462 | )
(Dollars in thousands) |  | Securities AFS |  | Cash Flow Hedges |  | Pension and Post-retirement Plans |  | Total
Balance as of April 1, 2016 |  | $ | 42,554 |  |  | $ | 3,465 |  |  | $ | (216,460 | ) |  | $ | (170,441 | )
Net unrealized gains/(losses) |  | 16,037 |  |  | 1,600 |  |  | — |  |  | 17,637 |
Amounts reclassified from AOCI |  | — |  |  | (374 | ) |  | 844 |  |  | 470 |
Other comprehensive income/(loss) |  | 16,037 |  |  | 1,226 |  |  | 844 |  |  | 18,107 |
Balance as of June 30, 2016 |  | $ | 58,591 |  |  | $ | 4,691 |  |  | $ | (215,616 | ) |  | $ | (152,334 | )
Balance as of January 1, 2016 |  | $ | 3,394 |  |  | $ | — |  |  | $ | (217,586 | ) |  | $ | (214,192 | )
Net unrealized gains/(losses) |  | 56,217 |  |  | 5,439 |  |  | — |  |  | 61,656 |
Amounts reclassified from AOCI |  | (1,020 | ) |  | (748 | ) |  | 1,970 |  |  | 202 |
Other comprehensive income/(loss) |  | 55,197 |  |  | 4,691 |  |  | 1,970 |  |  | 61,858 |
Balance as of June 30, 2016 |  | $ | 58,591 |  |  | $ | 4,691 |  |  | $ | (215,616 | ) |  | $ | (152,334 | )
Reclassification Out Of Accumulated Other Comprehensive Income | Reclassifications from AOCI, and related tax effects, were as follows:
(Dollars in thousands) |  | Three Months Ended June 30 |  | Six Months Ended June 30 |  |
Details about AOCI |  | 2017 |  | 2016 |  | 2017 |  | 2016 |  | Affected line item in the statement where net income is presented
Securities AFS: |  |  |  |  |  |  |  |  |  |
Realized (gains)/losses on securities AFS |  | $ | (405 | ) |  | $ | — |  |  | $ | (449 | ) |  | $ | (1,654 | ) |  | Debt securities gains/(losses), net
Tax expense/(benefit) |  | 155 |  |  | — |  |  | 172 |  |  | 634 |  |  | Provision/(benefit) for income taxes
|  | (250 | ) |  | — |  |  | (277 | ) |  | (1,020 | ) |  |
Cash flow hedges: |  |  |  |  |  |  |  |  |  |
Realized (gains)/losses on cash flow hedges |  | (1,465 | ) |  | (607 | ) |  | (2,845 | ) |  | (1,213 | ) |  | Interest and fees on loans
Tax expense/(benefit) |  | 561 |  |  | 233 |  |  | 1,089 |  |  | 465 |  |  | Provision/(benefit) for income taxes
|  | (904 | ) |  | (374 | ) |  | (1,756 | ) |  | (748 | ) |  |
Pension and Postretirement Plans: |  |  |  |  |  |  |  |  |  |
Amortization of prior service cost and net actuarial gain/(loss) |  | 2,273 |  |  | 1,369 |  |  | 4,173 |  |  | 3,195 |  |  | Employee compensation, incentives, and benefits
Tax expense/(benefit) |  | (870 | ) |  | (525 | ) |  | (1,597 | ) |  | (1,225 | ) |  | Provision/(benefit) for income taxes
|  | 1,403 |  |  | 844 |  |  | 2,576 |  |  | 1,970 |  |  |
Total reclassification from AOCI |  | $ | 249 |  |  | $ | 470 |  |  | $ | 543 |  |  | $ | 202 |  |  |

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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=66004124&loc=SL7669686-108580 + Details
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