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Components of Other Comprehensive Income/(loss) (Tables) | 3 Months Ended
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Mar. 31, 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 months ended March 31, 2020 and 2019:
(Dollars in thousands) |  | Securities AFS |  | Cash Flow Hedges |  | Pension and Post-retirement Plans |  | Total
Balance as of January 1, 2020 |  | $ | 31,079 |  |  | $ | 3,227 |  |  | $ | (273,914 | ) |  | $ | (239,608 | )
Net unrealized gains/(losses) |  | 88,278 |  |  | 13,155 |  |  | — |  |  | 101,433 |
Amounts reclassified from AOCI |  | — |  |  | (94 | ) |  | 2,105 |  |  | 2,011 |
Other comprehensive income/(loss) |  | 88,278 |  |  | 13,061 |  |  | 2,105 |  |  | 103,444 |
Balance as of March 31, 2020 |  | $ | 119,357 |  |  | $ | 16,288 |  |  | $ | (271,809 | ) |  | $ | (136,164 | )
Balance as of January 1, 2019 |  | $ | (75,736 | ) |  | $ | (12,112 | ) |  | $ | (288,768 | ) |  | $ | (376,616 | )
Net unrealized gains/(losses) |  | 48,615 |  |  | 3,936 |  |  | — |  |  | 52,551 |
Amounts reclassified from AOCI |  | — |  |  | 1,451 |  |  | 1,463 |  |  | 2,914 |
Other comprehensive income/(loss) |  | 48,615 |  |  | 5,387 |  |  | 1,463 |  |  | 55,465 |
Balance as of March 31, 2019 |  | $ | (27,121 | ) |  | $ | (6,725 | ) |  | $ | (287,305 | ) |  | $ | (321,151 | )
Reclassification Out Of Accumulated Other Comprehensive Income | Reclassifications from AOCI, and related tax effects, were as follows:
(Dollars in thousands) |  | Three Months Ended March 31 |  |
Details about AOCI |  | 2020 |  | 2019 |  | Affected line item in the statement where net income is presented
Cash flow hedges: |  |  |  |  |  |
Realized (gains)/losses on cash flow hedges |  | (124 | ) |  | 1,927 |  |  | Interest and fees on loans
Tax expense/(benefit) |  | 30 |  |  | (476 | ) |  | Provision/(benefit) for income taxes
|  | (94 | ) |  | 1,451 |  |  |
Pension and Postretirement Plans: |  |  |  |  |  |
Amortization of prior service cost and net actuarial gain/(loss) |  | 2,791 |  |  | 1,943 |  |  | All other expense
Tax expense/(benefit) |  | (686 | ) |  | (480 | ) |  | Provision/(benefit) for income taxes
|  | 2,105 |  |  | 1,463 |  |  |
Total reclassification from AOCI |  | $ | 2,011 |  |  | $ | 2,914 |  |  |

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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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