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Components of Other Comprehensive Income/(Loss) (Tables) | 6 Months Ended
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Jun. 30, 2018
Equity [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, 2018 and 2017:
(Dollars in thousands) |  | Securities AFS |  | Cash Flow Hedges |  | Pension and Post-retirement Plans |  | Total
Balance as of April 1, 2018 |  | $ | (86,382 | ) |  | $ | (16,763 | ) |  | $ | (286,940 | ) |  | $ | (390,085 | )
Net unrealized gains/(losses) |  | (21,094 | ) |  | (3,457 | ) |  | — |  |  | (24,551 | )
Amounts reclassified from AOCI |  | — |  |  | 463 |  |  | 2,059 |  |  | 2,522 |
Other comprehensive income/(loss) |  | (21,094 | ) |  | (2,994 | ) |  | 2,059 |  |  | (22,029 | )
Balance as of June 30, 2018 |  | $ | (107,476 | ) |  | $ | (19,757 | ) |  | $ | (284,881 | ) |  | $ | (412,114 | )
Balance as of January 1, 2018 |  | $ | (26,834 | ) |  | $ | (7,764 | ) |  | $ | (288,227 | ) |  | $ | (322,825 | )
Adjustment to reflect adoption of ASU 2016-01 and ASU 2017-12 |  | (5 | ) |  | (206 | ) |  | — |  |  | (211 | )
Beginning balance, as adjusted |  | $ | (26,839 | ) |  | $ | (7,970 | ) |  | $ | (288,227 | ) |  | $ | (323,036 | )
Net unrealized gains/(losses) |  | (80,598 | ) |  | (12,095 | ) |  | — |  |  | (92,693 | )
Amounts reclassified from AOCI |  | (39 | ) |  | 308 |  |  | 3,346 |  |  | 3,615 |
Other comprehensive income/(loss) |  | (80,637 | ) |  | (11,787 | ) |  | 3,346 |  |  | (89,078 | )
Balance as of June 30, 2018 |  | $ | (107,476 | ) |  | $ | (19,757 | ) |  | $ | (284,881 | ) |  | $ | (412,114 | )
(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 | )
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 |  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | Affected line item in the statement where net income is presented
Securities AFS: |  |  |  |  |  |  |  |  |  |
Realized (gains)/losses on securities AFS |  | $ | — |  |  | $ | (405 | ) |  | $ | (52 | ) |  | $ | (449 | ) |  | Debt securities gains/(losses), net
Tax expense/(benefit) |  | — |  |  | 155 |  |  | 13 |  |  | 172 |  |  | Provision/(benefit) for income taxes
|  | — |  |  | (250 | ) |  | (39 | ) |  | (277 | ) |  |
Cash flow hedges: |  |  |  |  |  |  |  |  |  |
Realized (gains)/losses on cash flow hedges |  | 615 |  |  | (1,465 | ) |  | 409 |  |  | (2,845 | ) |  | Interest and fees on loans
Tax expense/(benefit) |  | (152 | ) |  | 561 |  |  | (101 | ) |  | 1,089 |  |  | Provision/(benefit) for income taxes
|  | 463 |  |  | (904 | ) |  | 308 |  |  | (1,756 | ) |  |
Pension and Postretirement Plans: |  |  |  |  |  |  |  |  |  |
Amortization of prior service cost and net actuarial gain/(loss) |  | 2,735 |  |  | 2,273 |  |  | 4,444 |  |  | 4,173 |  |  | All other expense
Tax expense/(benefit) |  | (676 | ) |  | (870 | ) |  | (1,098 | ) |  | (1,597 | ) |  | Provision/(benefit) for income taxes
|  | 2,059 |  |  | 1,403 |  |  | 3,346 |  |  | 2,576 |  |  |
Total reclassification from AOCI |  | $ | 2,522 |  |  | $ | 249 |  |  | $ | 3,615 |  |  | $ | 543 |  |  |

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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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