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Components of Other Comprehensive Income/(Loss) (Tables) | 6 Months Ended
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Jun. 30, 2019
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, 2019 and 2018:
(Dollars in thousands) |  | Securities AFS |  | Cash Flow Hedges |  | Pension and Post-retirement Plans |  | Total
Balance as of April 1, 2019 |  | $ | (27,121 | ) |  | $ | (6,725 | ) |  | $ | (287,305 | ) |  | $ | (321,151 | )
Net unrealized gains/(losses) |  | 47,991 |  |  | 7,575 |  |  | — |  |  | 55,566 |
Amounts reclassified from AOCI |  | 201 |  |  | 1,334 |  |  | 1,561 |  |  | 3,096 |
Other comprehensive income/(loss) |  | 48,192 |  |  | 8,909 |  |  | 1,561 |  |  | 58,662 |
Balance as of June 30, 2019 |  | $ | 21,071 |  |  | $ | 2,184 |  |  | $ | (285,744 | ) |  | $ | (262,489 | )
Balance as of January 1, 2019 |  | $ | (75,736 | ) |  | $ | (12,112 | ) |  | $ | (288,768 | ) |  | $ | (376,616 | )
Net unrealized gains/(losses) |  | 96,606 |  |  | 11,511 |  |  | — |  |  | 108,117 |
Amounts reclassified from AOCI |  | 201 |  |  | 2,785 |  |  | 3,024 |  |  | 6,010 |
Other comprehensive income/(loss) |  | 96,807 |  |  | 14,296 |  |  | 3,024 |  |  | 114,127 |
Balance as of June 30, 2019 |  | $ | 21,071 |  |  | $ | 2,184 |  |  | $ | (285,744 | ) |  | $ | (262,489 | )
(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 | )
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 |  | 2019 |  | 2018 |  | 2019 |  | 2018 |  | Affected line item in the statement where net income is presented
Securities AFS: |  |  |  |  |  |  |  |  |  |
Realized (gains)/losses on securities AFS |  | $ | 267 |  |  | $ | — |  |  | $ | 267 |  |  | $ | (52 | ) |  | Debt securities gains/(losses), net
Tax expense/(benefit) |  | (66 | ) |  | — |  |  | (66 | ) |  | 13 |  |  | Provision/(benefit) for income taxes
|  | 201 |  |  | — |  |  | 201 |  |  | (39 | ) |  |
Cash flow hedges: |  |  |  |  |  |  |  |  |  |
Realized (gains)/losses on cash flow hedges |  | 1,772 |  |  | 615 |  |  | 3,699 |  |  | 409 |  |  | Interest and fees on loans
Tax expense/(benefit) |  | (438 | ) |  | (152 | ) |  | (914 | ) |  | (101 | ) |  | Provision/(benefit) for income taxes
|  | 1,334 |  |  | 463 |  |  | 2,785 |  |  | 308 |  |  |
Pension and Postretirement Plans: |  |  |  |  |  |  |  |  |  |
Amortization of prior service cost and net actuarial gain/(loss) |  | 2,074 |  |  | 2,735 |  |  | 4,017 |  |  | 4,444 |  |  | All other expense
Tax expense/(benefit) |  | (513 | ) |  | (676 | ) |  | (993 | ) |  | (1,098 | ) |  | Provision/(benefit) for income taxes
|  | 1,561 |  |  | 2,059 |  |  | 3,024 |  |  | 3,346 |  |  |
Total reclassification from AOCI |  | $ | 3,096 |  |  | $ | 2,522 |  |  | $ | 6,010 |  |  | $ | 3,615 |  |  |

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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://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=118930883&loc=SL7669686-108580 + Details
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