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Components of Other Comprehensive Income/(Loss) (Tables) | 3 Months Ended
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Mar. 31, 2017
Table Text Block Supplement [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, 2017 and 2016: |
(Dollars in thousands) |  | Securities AFS |  |  | Cash Flow Hedges | Pension and Post-retirement Plans |  | Total
Balance as of January 1, 2017 |  | $ | (17,232) |  |  | $ | (1,265) |  |  | $ | (229,157) |  |  | $ | (247,654) |
| Net unrealized gains/(losses) |  |  | (1,536) |  |  |  | (1,062) |  |  |  | - |  |  |  | (2,598) |
| Amounts reclassified from AOCI |  |  | (27) |  |  |  | (852) |  |  |  | 1,173 |  |  |  | 294 |
| Other comprehensive income/(loss) |  |  | (1,563) |  |  |  | (1,914) |  |  |  | 1,173 |  |  |  | (2,304) |
Balance as of March 31, 2017 |  | $ | (18,795) |  |  | $ | (3,179) |  |  | $ | (227,984) |  |  | $ | (249,958) |
Balance as of January 1, 2016 |  | $ | 3,394 |  |  | $ | - |  |  | $ | (217,586) |  |  | $ | (214,192) |
| Net unrealized gains/(losses) |  |  | 40,180 |  |  |  | 3,839 |  |  |  | - |  |  |  | 44,019 |
| Amounts reclassified from AOCI |  |  | (1,020) |  |  |  | (374) |  |  |  | 1,126 |  |  |  | (268) |
| Other comprehensive income/(loss) |  |  | 39,160 |  |  |  | 3,465 |  |  |  | 1,126 |  |  |  | 43,751 |
Balance as of March 31, 2016 |  | $ | 42,554 |  |  | $ | 3,465 |  |  | $ | (216,460) |  |  | $ | (170,441) |
Reclassification Out Of Accumulated Other Comprehensive Income [Table Text Block] |
Reclassifications from AOCI, and related tax effects, were as follows:
(Dollars in thousands) |  | Three Months Ended March 31 |  |  |
Details about AOCI |  | 2017 |  | 2016 |  |  | Affected line item in the statement where net income is presented
Securities AFS: |  |  |  |  |  |  |  |  |
| Realized (gains)/losses on securities AFS |  | $ | (44) |  | $ | (1,654) |  |  | Debt securities gains/(losses), net
| Tax expense/(benefit) |  |  | 17 |  |  | 634 |  |  | Provision/(benefit) for income taxes
|  |  |  | (27) |  |  | (1,020) |  |  |
Cash flow hedges: |  |  |  |  |  |  |  |  |
| Realized (gains)/losses on cash flow hedges |  |  | (1,380) |  |  | (606) |  |  | Interest and fees on loans
| Tax expense/(benefit) |  |  | 528 |  |  | 232 |  |  | Provision/(benefit) for income taxes
|  |  |  | (852) |  |  | (374) |  |  |
Pension and Postretirement Plans: |  |  |  |  |  |  |  |  |
| Amortization of prior service cost and net actuarial gain/(loss) |  |  | 1,900 |  |  | 1,826 |  |  | Employee compensation, incentives, and benefits
| Tax expense/(benefit) |  |  | (727) |  |  | (700) |  |  | Provision/(benefit) for income taxes
|  |  |  | 1,173 |  |  | 1,126 |  |  |
Total reclassification from AOCI |  | $ | 294 |  | $ | (268) |  |  |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
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