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Components of Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 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 nine months ended September 30, 2020 and 2019:
(Dollars in thousands) |  | Securities AFS |  | Cash Flow Hedges |  | Pension and Post-retirement Plans |  | Total
Balance as of July 1, 2020 |  | $ | 118,327 |  |  | $ | 16,305 |  |  | $ | (269,430) |  |  | $ | (134,798) |
Net unrealized gains (losses) |  | (6,121) |  |  | (805) |  |  | (141) |  |  | (7,067) |
Amounts reclassified from AOCI |  | 1,003 |  |  | (2,128) |  |  | 2,520 |  |  | 1,395 |
Other comprehensive income (loss) |  | (5,118) |  |  | (2,933) |  |  | 2,379 |  |  | (5,672) |
Balance as of September 30, 2020 |  | $ | 113,209 |  |  | $ | 13,372 |  |  | $ | (267,051) |  |  | $ | (140,470) |
Balance as of January 1, 2020 |  | $ | 31,079 |  |  | $ | 3,227 |  |  | $ | (273,914) |  |  | $ | (239,608) |
Net unrealized gains (losses) |  | 81,127 |  |  | 13,998 |  |  | (163) |  |  | 94,962 |
Amounts reclassified from AOCI |  | 1,003 |  |  | (3,853) |  |  | 7,026 |  |  | 4,176 |
Other comprehensive income (loss) |  | 82,130 |  |  | 10,145 |  |  | 6,863 |  |  | 99,138 |
Balance as of September 30, 2020 |  | $ | 113,209 |  |  | $ | 13,372 |  |  | $ | (267,051) |  |  | $ | (140,470) |
(Dollars in thousands) |  | Securities AFS |  | Cash Flow Hedges |  | Pension and Post-retirement Plans |  | Total
Balance as of July 1, 2019 |  | $ | 21,071 |  |  | $ | 2,184 |  |  | $ | (285,744) |  |  | $ | (262,489) |
Net unrealized gains (losses) |  | 16,889 |  |  | 1,855 |  |  | — |  |  | 18,744 |
Amounts reclassified from AOCI |  | — |  |  | 989 |  |  | 2,102 |  |  | 3,091 |
Other comprehensive income (loss) |  | 16,889 |  |  | 2,844 |  |  | 2,102 |  |  | 21,835 |
Balance as of September 30, 2019 |  | $ | 37,960 |  |  | $ | 5,028 |  |  | $ | (283,642) |  |  | $ | (240,654) |
Balance as of January 1, 2019 |  | $ | (75,736) |  |  | $ | (12,112) |  |  | $ | (288,768) |  |  | $ | (376,616) |
Net unrealized gains (losses) |  | 113,495 |  |  | 13,367 |  |  | — |  |  | 126,862 |
Amounts reclassified from AOCI |  | 201 |  |  | 3,773 |  |  | 5,126 |  |  | 9,100 |
Other comprehensive income (loss) |  | 113,696 |  |  | 17,140 |  |  | 5,126 |  |  | 135,962 |
Balance as of September 30, 2019 |  | $ | 37,960 |  |  | $ | 5,028 |  |  | $ | (283,642) |  |  | $ | (240,654) |
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 |  | 2020 |  | 2019 |  | 2020 |  | 2019 |  | Affected line item in the statement where net income is presented
Securities AFS: |  |  |  |  |  |  |  |  |  |
Realized (gains) losses on securities AFS |  | $ | 1,323 |  |  | $ | — |  |  | $ | 1,323 |  |  | $ | 267 |  |  | Securities gains (losses), net
Tax expense (benefit) |  | (320) |  |  | — |  |  | (320) |  |  | (66) |  |  | Provision (benefit) for income taxes
|  | 1,003 |  |  | — |  |  | 1,003 |  |  | 201 |  |  |
Cash flow hedges: |  |  |  |  |  |  |  |  |  |
Realized (gains) losses on cash flow hedges |  | (2,807) |  |  | 1,313 |  |  | (5,084) |  |  | 5,012 |  |  | Interest and fees on loans and leases
Tax expense (benefit) |  | 679 |  |  | (324) |  |  | 1,231 |  |  | (1,239) |  |  | Provision (benefit) for income taxes
|  | (2,128) |  |  | 989 |  |  | (3,853) |  |  | 3,773 |  |  |
Pension and Postretirement Plans: |  |  |  |  |  |  |  |  |  |
Amortization of prior service cost and net actuarial gain (loss) |  | 3,325 |  |  | 2,792 |  |  | 9,270 |  |  | 6,809 |  |  | All other expense
Tax expense (benefit) |  | (805) |  |  | (690) |  |  | (2,244) |  |  | (1,683) |  |  | Provision (benefit) for income taxes
|  | 2,520 |  |  | 2,102 |  |  | 7,026 |  |  | 5,126 |  |  |
Total reclassification from AOCI |  | $ | 1,395 |  |  | $ | 3,091 |  |  | $ | 4,176 |  |  | $ | 9,100 |  |  |

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