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Components of Other Comprehensive Income/(Loss) (Tables) | 9 Months Ended
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Sep. 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 nine months ended September 30, 2017 and 2016:
(Dollars in thousands) |  | Securities AFS |  | Cash Flow Hedges |  | Pension and Post-retirement Plans |  | Total
Balance as of July 1, 2017 |  | $ | (9,857 | ) |  | $ | (1,024 | ) |  | $ | (226,581 | ) |  | $ | (237,462 | )
Net unrealized gains/(losses) |  | 3,918 |  |  | (91 | ) |  | 490 |  |  | 4,317 |
Amounts reclassified from AOCI |  | (1 | ) |  | (643 | ) |  | 1,405 |  |  | 761 |
Other comprehensive income/(loss) |  | 3,917 |  |  | (734 | ) |  | 1,895 |  |  | 5,078 |
Balance as of September 30, 2017 |  | $ | (5,940 | ) |  | $ | (1,758 | ) |  | $ | (224,686 | ) |  | $ | (232,384 | )
Balance as of January 1, 2017 |  | $ | (17,232 | ) |  | $ | (1,265 | ) |  | $ | (229,157 | ) |  | $ | (247,654 | )
Net unrealized gains/(losses) |  | 11,570 |  |  | 1,906 |  |  | 490 |  |  | 13,966 |
Amounts reclassified from AOCI |  | (278 | ) |  | (2,399 | ) |  | 3,981 |  |  | 1,304 |
Other comprehensive income/(loss) |  | 11,292 |  |  | (493 | ) |  | 4,471 |  |  | 15,270 |
Balance as of September 30, 2017 |  | $ | (5,940 | ) |  | $ | (1,758 | ) |  | $ | (224,686 | ) |  | $ | (232,384 | )
(Dollars in thousands) |  | Securities AFS |  | Cash Flow Hedges |  | Pension and Post-retirement Plans |  | Total
Balance as of July 1, 2016 |  | $ | 58,591 |  |  | $ | 4,691 |  |  | $ | (215,616 | ) |  | $ | (152,334 | )
Net unrealized gains/(losses) |  | (7,887 | ) |  | (1,211 | ) |  | — |  |  | (9,098 | )
Amounts reclassified from AOCI |  | — |  |  | (359 | ) |  | 963 |  |  | 604 |
Other comprehensive income/(loss) |  | (7,887 | ) |  | (1,570 | ) |  | 963 |  |  | (8,494 | )
Balance as of September 30, 2016 |  | $ | 50,704 |  |  | $ | 3,121 |  |  | $ | (214,653 | ) |  | $ | (160,828 | )
Balance as of January 1, 2016 |  | $ | 3,394 |  |  | $ | — |  |  | $ | (217,586 | ) |  | $ | (214,192 | )
Net unrealized gains/(losses) |  | 48,330 |  |  | 4,228 |  |  | — |  |  | 52,558 |
Amounts reclassified from AOCI |  | (1,020 | ) |  | (1,107 | ) |  | 2,933 |  |  | 806 |
Other comprehensive income/(loss) |  | 47,310 |  |  | 3,121 |  |  | 2,933 |  |  | 53,364 |
Balance as of September 30, 2016 |  | $ | 50,704 |  |  | $ | 3,121 |  |  | $ | (214,653 | ) |  | $ | (160,828 | )
Reclassification Out Of Accumulated Other Comprehensive Income | Reclassifications from AOCI, and related tax effects, were as follows:
(Dollars in thousands) |  | Three Months Ended September 30 |  | Nine Months Ended September 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 |  | $ | (1 | ) |  | $ | — |  |  | $ | (450 | ) |  | $ | (1,654 | ) |  | Debt securities gains/(losses), net
Tax expense/(benefit) |  | — |  |  | — |  |  | 172 |  |  | 634 |  |  | Provision/(benefit) for income taxes
|  | (1 | ) |  | — |  |  | (278 | ) |  | (1,020 | ) |  |
Cash flow hedges: |  |  |  |  |  |  |  |  |  |
Realized (gains)/losses on cash flow hedges |  | (1,041 | ) |  | (582 | ) |  | (3,886 | ) |  | (1,795 | ) |  | Interest and fees on loans
Tax expense/(benefit) |  | 398 |  |  | 223 |  |  | 1,487 |  |  | 688 |  |  | Provision/(benefit) for income taxes
|  | (643 | ) |  | (359 | ) |  | (2,399 | ) |  | (1,107 | ) |  |
Pension and Postretirement Plans: |  |  |  |  |  |  |  |  |  |
Amortization of prior service cost and net actuarial gain/(loss) |  | 2,277 |  |  | 1,561 |  |  | 6,450 |  |  | 4,756 |  |  | Employee compensation, incentives, and benefits
Tax expense/(benefit) |  | (872 | ) |  | (598 | ) |  | (2,469 | ) |  | (1,823 | ) |  | Provision/(benefit) for income taxes
|  | 1,405 |  |  | 963 |  |  | 3,981 |  |  | 2,933 |  |  |
Total reclassification from AOCI |  | $ | 761 |  |  | $ | 604 |  |  | $ | 1,304 |  |  | $ | 806 |  |  |

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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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