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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2016
Stockholders' Equity [Abstract] |
Components of Accumulated Other Comprehensive Income (Loss) |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | Available |  | HTM Securities |  |  |  | Loss on |  |  |
﻿ |  | for Sale |  | Transferred |  | Employee |  | Effective Cash |  |  |
﻿(in thousands) |  | Securities |  | from AFS |  | Benefit Plans |  | Flow Hedges |  | Total
﻿Balance, December 31, 2014 |  | $ | 18,001 |  | $ | (19,074) |  | $ | (48,626) |  | $ | (375) |  | $ | (50,074)
﻿Other comprehensive income before income taxes: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Net change in unrealized gain |  |  | 163 |  |  | — |  |  | — |  |  | 2,011 |  |  | 2,174
﻿Reclassification of net (gain) losses realized and included in earnings |  |  | (165) |  |  | — |  |  | 2,373 |  |  | — |  |  | 2,208
﻿Valuation adjustment for employee benefit plans |  |  | — |  |  | — |  |  | (959) |  |  | — |  |  | (959)
﻿Amortization of unrealized net loss on securities transferred to HTM |  |  | — |  |  | 2,609 |  |  | — |  |  | — |  |  | 2,609
﻿Income tax (benefit) expense |  |  | (73) |  |  | 953 |  |  | 513 |  |  | 732 |  |  | 2,125
﻿Balance, September 30, 2015 |  | $ | 18,072 |  | $ | (17,418) |  | $ | (47,725) |  | $ | 904 |  | $ | (46,167)
﻿Balance, December 31, 2015 |  | $ | 4,268 |  | $ | (16,795) |  | $ | (67,890) |  | $ | (178) |  | $ | (80,595)
﻿Other comprehensive income before income taxes: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Net change in unrealized gain |  |  | 38,835 |  |  | — |  |  | — |  |  | 1,162 |  |  | 39,997
﻿Reclassification of net (gain) losses realized and included in earnings |  |  | (1,435) |  |  | — |  |  | 4,395 |  |  | — |  |  | 2,960
﻿Valuation adjustment for employee benefit plans |  |  | — |  |  | — |  |  | (6,347) |  |  |  |  |  | (6,347)
﻿Amortization of unrealized net loss on securities transferred to HTM |  |  | — |  |  | 2,736 |  |  | — |  |  | — |  |  | 2,736
﻿Income tax expense (benefit) |  |  | 13,701 |  |  | 1,029 |  |  | (714) |  |  | 424 |  |  | 14,440
﻿Balance, September 30, 2016 |  | $ | 27,967 |  | $ | (15,088) |  | $ | (69,128) |  | $ | 560 |  | $ | (55,689)
﻿
Line Items in Consolidated Income Statements Affected by Amounts Reclassified from Accumulated Other Comprehensive Income |
﻿ |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |
﻿ |  | Nine Months Ended |  |
﻿Amount reclassified from AOCI (a) |  | September 30, |  | Affected line item on
﻿(in thousands) |  |  | 2016 |  |  | 2015 |  | the income statement
﻿Gain on sale of AFS securities |  | $ | 1,435 |  | $ | 165 |  | Securities transactions
﻿Tax effect |  |  | (502) |  |  | (58) |  | Income taxes
﻿Net of tax |  |  | 933 |  |  | 107 |  | Net income
﻿Amortization of unrealized net loss on securities transferred to HTM |  |  | (2,736) |  |  | (2,609) |  | Interest income
﻿Tax effect |  |  | 1,029 |  |  | 953 |  | Income taxes
﻿Net of tax |  |  | (1,707) |  |  | (1,656) |  | Net income
﻿Amortization of defined benefit pension and post-retirement items |  |  | (4,395) |  |  | (2,373) |  | Employee benefits expense (b)
﻿Tax effect |  |  | 1,538 |  |  | 831 |  | Income taxes
﻿Net of tax |  |  | (2,857) |  |  | (1,542) |  | Net income
﻿Total reclassifications, net of tax |  | $ | (3,631) |  | $ | (3,091) |  | Net income
﻿
| (a) |  | Amounts in parenthesis indicate reduction in net income.
﻿
| (b) |  | These accumulated other comprehensive income components are included in the computation of net periodic pension and post-retirement cost that is reported with employee benefits expense (see Note 11 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=36458714&loc=SL7669686-108580 + Details
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