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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2018
Stockholders' Equity [Abstract] |
Components of Accumulated Other Comprehensive Income (Loss) |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | Available |  | HTM Securities |  |  |  |  |  |  |
﻿ |  | for Sale |  | Transferred |  | Employee |  | Cash |  |  |
﻿(in thousands) |  | Securities |  | from AFS |  | Benefit Plans |  | Flow Hedges |  | Total
﻿Balance, December 31, 2016 |  | $ | (28,679) |  | $ | (14,392) |  | $ | (72,501) |  | $ | (4,960) |  | $ | (120,532)
﻿Other comprehensive income (loss) before income taxes: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Net change in unrealized gain (loss) |  |  | 14,687 |  |  | — |  |  | — |  |  | (842) |  |  | 13,845
﻿Reclassification of net loss realized and included in earnings |  |  | — |  |  | — |  |  | 3,105 |  |  | — |  |  | 3,105
﻿Valuation adjustment for pension plan amendment |  |  | — |  |  | — |  |  | 17,315 |  |  | — |  |  | 17,315
﻿Other valuation adjustments for employee benefit plan |  |  | — |  |  | — |  |  | (10,782) |  |  | — |  |  | (10,782)
﻿Amortization of unrealized net loss on securities transferred to HTM |  |  | — |  |  | 1,749 |  |  | — |  |  | — |  |  | 1,749
﻿Income tax expense (benefit) |  |  | 5,333 |  |  | 657 |  |  | 3,458 |  |  | (309) |  |  | 9,139
﻿Balance, June 30, 2017 |  | $ | (19,325) |  | $ | (13,300) |  | $ | (66,321) |  | $ | (5,493) |  | $ | (104,439)
﻿Balance, December 31, 2017 |  | $ | (29,512) |  | $ | (14,585) |  | $ | (79,078) |  | $ | (11,227) |  | $ | (134,402)
﻿Other comprehensive income (loss) before income taxes: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Net change in unrealized losses |  |  | (71,759) |  |  | — |  |  | — |  |  | (13,894) |  |  | (85,653)
﻿Reclassification of net losses realized and included in earnings |  |  | — |  |  | — |  |  | 2,448 |  |  | 1,565 |  |  | 4,013
﻿Other valuation adjustments for employee benefit plan |  |  | — |  |  | — |  |  | (9,039) |  |  | — |  |  | (9,039)
﻿Amortization of unrealized net loss on securities transferred to HTM |  |  | — |  |  | 1,680 |  |  | — |  |  | — |  |  | 1,680
﻿Income tax expense (benefit) |  |  | (16,284) |  |  | 380 |  |  | (1,494) |  |  | (2,794) |  |  | (20,192)
﻿Balance, June 30, 2018 |  | $ | (84,987) |  | $ | (13,285) |  | $ | (84,175) |  | $ | (20,762) |  | $ | (203,209)
﻿
Line Items in Consolidated Income Statements Affected by Amounts Reclassified from Accumulated Other Comprehensive Income |
﻿ |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |
﻿ |  | Six Months Ended |  |
﻿Amount reclassified from AOCI (a) |  | June 30, |  | Affected line item on
﻿(in thousands) |  |  | 2018 |  |  | 2017 |  | the statement of income
﻿Amortization of unrealized net loss on securities transferred to HTM |  | $ | (1,680) |  | $ | (1,749) |  | Interest income
﻿Tax effect |  |  | 380 |  |  | 657 |  | Income taxes
﻿Net of tax |  |  | (1,300) |  |  | (1,092) |  | Net income
﻿Amortization of defined benefit pension and post-retirement items |  |  | (2,448) |  |  | (3,105) |  | Other noninterest expense (b)
﻿Tax effect |  |  | 555 |  |  | 1,114 |  | Income taxes
﻿Net of tax |  |  | (1,893) |  |  | (1,991) |  | Net income
﻿Reclassification of unrealized gain on cash flow hedges |  |  | 979 |  |  | — |  | Interest income
﻿Tax effect |  |  | (222) |  |  | — |  | Income taxes
﻿Net of tax |  |  | 757 |  |  | — |  | Net income
﻿Amortization of loss on terminated cash flow hedges |  |  | (2,544) |  |  | — |  | Interest income
﻿Tax effect |  |  | 577 |  |  | — |  | Income taxes
﻿Net of tax |  |  | (1,967) |  |  | — |  | Net income
﻿Total reclassifications, net of tax |  | $ | (4,403) |  | $ | (3,083) |  | Net income
| (a) |  | Amounts in parenthese s indicate reduction in net income.
| (b) |  | These AOCI components are included in the computation of net periodic pension and post-retirement cost that is reported with employee benefits expense (see Note 1 2 – Retirement Plans for additional 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=84228862&loc=SL7669686-108580 + Details
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