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Components of Other Comprehensive Income/(Loss) (Tables) | 9 Months Ended
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Sep. 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 nine months ended September 30, 2018 and 2017:
(Dollars in thousands) |  | Securities AFS |  | Cash Flow Hedges |  | Pension and Post-retirement Plans |  | Total
Balance as of July 1, 2018 |  | $ | (107,476 | ) |  | $ | (19,757 | ) |  | $ | (284,881 | ) |  | $ | (412,114 | )
Net unrealized gains/(losses) |  | (25,924 | ) |  | (2,517 | ) |  | — |  |  | (28,441 | )
Amounts reclassified from AOCI |  | — |  |  | 771 |  |  | 2,135 |  |  | 2,906 |
Other comprehensive income/(loss) |  | (25,924 | ) |  | (1,746 | ) |  | 2,135 |  |  | (25,535 | )
Balance as of September 30, 2018 |  | $ | (133,400 | ) |  | $ | (21,503 | ) |  | $ | (282,746 | ) |  | $ | (437,649 | )
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) |  | (106,522 | ) |  | (14,612 | ) |  | — |  |  | (121,134 | )
Amounts reclassified from AOCI |  | (39 | ) |  | 1,079 |  |  | 5,481 |  |  | 6,521 |
Other comprehensive income/(loss) |  | (106,561 | ) |  | (13,533 | ) |  | 5,481 |  |  | (114,613 | )
Balance as of September 30, 2018 |  | $ | (133,400 | ) |  | $ | (21,503 | ) |  | $ | (282,746 | ) |  | $ | (437,649 | )
(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 | )
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 |  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | Affected line item in the statement where net income is presented
Securities AFS: |  |  |  |  |  |  |  |  |  |
Realized (gains)/losses on securities AFS |  | $ | — |  |  | $ | (1 | ) |  | $ | (52 | ) |  | $ | (450 | ) |  | Debt securities gains/(losses), net
Tax expense/(benefit) |  | — |  |  | — |  |  | 13 |  |  | 172 |  |  | Provision/(benefit) for income taxes
|  | — |  |  | (1 | ) |  | (39 | ) |  | (278 | ) |  |
Cash flow hedges: |  |  |  |  |  |  |  |  |  |
Realized (gains)/losses on cash flow hedges |  | 1,024 |  |  | (1,041 | ) |  | 1,433 |  |  | (3,886 | ) |  | Interest and fees on loans
Tax expense/(benefit) |  | (253 | ) |  | 398 |  |  | (354 | ) |  | 1,487 |  |  | Provision/(benefit) for income taxes
|  | 771 |  |  | (643 | ) |  | 1,079 |  |  | (2,399 | ) |  |
Pension and Postretirement Plans: |  |  |  |  |  |  |  |  |  |
Amortization of prior service cost and net actuarial gain/(loss) |  | 2,836 |  |  | 2,277 |  |  | 7,280 |  |  | 6,450 |  |  | All other expense
Tax expense/(benefit) |  | (701 | ) |  | (872 | ) |  | (1,799 | ) |  | (2,469 | ) |  | Provision/(benefit) for income taxes
|  | 2,135 |  |  | 1,405 |  |  | 5,481 |  |  | 3,981 |  |  |
Total reclassification from AOCI |  | $ | 2,906 |  |  | $ | 761 |  |  | $ | 6,521 |  |  | $ | 1,304 |  |  |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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