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Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 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 |  |  | 2,319 |  |  | — |  |  | — |  |  | (1,135) |  |  | 1,184
﻿Reclassification of net (gain) loss realized and included in earnings |  |  | — |  |  | — |  |  | 1,387 |  |  | — |  |  | 1,387
﻿Amortization of unrealized net loss on securities transferred to HTM |  |  | — |  |  | 650 |  |  | — |  |  | — |  |  | 650
﻿Income tax expense (benefit) |  |  | 843 |  |  | 266 |  |  | 504 |  |  | (412) |  |  | 1,201
﻿Balance, March 31, 2017 |  | $ | (27,203) |  | $ | (14,008) |  | $ | (71,618) |  | $ | (5,683) |  | $ | (118,512)
﻿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 gain (loss) |  |  | (55,114) |  |  | — |  |  | — |  |  | (7,130) |  |  | (62,244)
﻿Reclassification of net losses realized and included in earnings |  |  | — |  |  | — |  |  | 1,177 |  |  | 619 |  |  | 1,796
﻿Other valuation adjustments for employee benefit plan |  |  | — |  |  | — |  |  | — |  |  |  |  |  | —
﻿Amortization of unrealized net loss on securities transferred to HTM |  |  | — |  |  | 755 |  |  | — |  |  | — |  |  | 755
﻿Income tax expense (benefit) |  |  | (12,508) |  |  | 171 |  |  | 267 |  |  | (1,476) |  |  | (13,546)
﻿Balance, March 31, 2018 |  | $ | (72,118) |  | $ | (14,001) |  | $ | (78,168) |  | $ | (16,262) |  | $ | (180,549)
﻿
Line Items in Consolidated Income Statements Affected by Amounts Reclassified from Accumulated Other Comprehensive Income |
﻿ |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |
﻿ |  | Three Months Ended |  |
﻿Amount reclassified from AOCI (a) |  | March 31, |  | Affected line item on
﻿(in thousands) |  |  | 2018 |  |  | 2017 |  | the statement of income
﻿Amortization of unrealized net loss on securities transferred to HTM |  |  | (755) |  |  | (650) |  | Interest income
﻿Tax effect |  |  | 171 |  |  | 266 |  | Income taxes
﻿Net of tax |  |  | (584) |  |  | (384) |  | Net income
﻿Amortization of defined benefit pension and post-retirement items |  |  | (1,177) |  |  | (1,387) |  | Other noninterest expense (b)
﻿Tax effect |  |  | 267 |  |  | 504 |  | Income taxes
﻿Net of tax |  |  | (910) |  |  | (883) |  | Net income
﻿Reclassification of unrealized gain on cash flow hedges |  |  | 336 |  |  | — |  | Interest income
﻿Tax effect |  |  | (76) |  |  | — |  | Income taxes
﻿Net of tax |  |  | 260 |  |  |  |  | Net income
﻿Amortization of loss on terminated cash flow hedges |  |  | (954) |  |  | — |  | Interest income
﻿Tax effect |  |  | 216 |  |  | — |  | Income taxes
﻿Net of tax |  |  | (738) |  |  | — |  | Net income
﻿Total reclassifications, net of tax |  | $ | (1,972) |  | $ | (1,267) |  | Net income
| (a) |  | Amounts in parenthesis 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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