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Components of Other Comprehensive Income/(loss) (Tables) | 6 Months Ended
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Jun. 30, 2020
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, 2020 and 2019:
(Dollars in thousands) |  | Securities AFS |  | Cash Flow Hedges |  | Pension and Post-retirement Plans |  | Total
Balance as of April 1, 2020 |  | $ | 119,357 |  |  | $ | 16,288 |  |  | $ | (271,809 | ) |  | $ | (136,164 | )
Net unrealized gains/(losses) |  | (1,030 | ) |  | 1,640 |  |  | — |  |  | 610 |
Amounts reclassified from AOCI |  | — |  |  | (1,623 | ) |  | 2,379 |  |  | 756 |
Other comprehensive income/(loss) |  | (1,030 | ) |  | 17 |  |  | 2,379 |  |  | 1,366 |
Balance as of June 30, 2020 |  | $ | 118,327 |  |  | $ | 16,305 |  |  | $ | (269,430 | ) |  | $ | (134,798 | )
Balance as of January 1, 2020 |  | $ | 31,079 |  |  | $ | 3,227 |  |  | $ | (273,914 | ) |  | $ | (239,608 | )
Net unrealized gains/(losses) |  | 87,248 |  |  | 14,795 |  |  | — |  |  | 102,043 |
Amounts reclassified from AOCI |  | — |  |  | (1,717 | ) |  | 4,484 |  |  | 2,767 |
Other comprehensive income/(loss) |  | 87,248 |  |  | 13,078 |  |  | 4,484 |  |  | 104,810 |
Balance as of June 30, 2020 |  | $ | 118,327 |  |  | $ | 16,305 |  |  | $ | (269,430 | ) |  | $ | (134,798 | )
(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 | )
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 |  | 2020 |  | 2019 |  | 2020 |  | 2019 |  | Affected line item in the statement where net income is presented
Securities AFS: |  |  |  |  |  |  |  |  |  |
Realized (gains)/losses on securities AFS |  | $ | — |  |  | $ | 267 |  |  | $ | — |  |  | $ | 267 |  |  | Debt securities gains/(losses), net
Tax expense/(benefit) |  | — |  |  | (66 | ) |  | — |  |  | (66 | ) |  | Provision/(benefit) for income taxes
|  | — |  |  | 201 |  |  | — |  |  | 201 |  |  |
Cash flow hedges: |  |  |  |  |  |  |  |  |  |
Realized (gains)/losses on cash flow hedges |  | (2,153 | ) |  | 1,772 |  |  | (2,277 | ) |  | 3,699 |  |  | Interest and fees on loans
Tax expense/(benefit) |  | 530 |  |  | (438 | ) |  | 560 |  |  | (914 | ) |  | Provision/(benefit) for income taxes
|  | (1,623 | ) |  | 1,334 |  |  | (1,717 | ) |  | 2,785 |  |  |
Pension and Postretirement Plans: |  |  |  |  |  |  |  |  |  |
Amortization of prior service cost and net actuarial gain/(loss) |  | 3,155 |  |  | 2,074 |  |  | 5,946 |  |  | 4,017 |  |  | All other expense
Tax expense/(benefit) |  | (776 | ) |  | (513 | ) |  | (1,462 | ) |  | (993 | ) |  | Provision/(benefit) for income taxes
|  | 2,379 |  |  | 1,561 |  |  | 4,484 |  |  | 3,024 |  |  |
Total reclassification from AOCI |  | $ | 756 |  |  | $ | 3,096 |  |  | $ | 2,767 |  |  | $ | 6,010 |  |  |

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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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