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Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2017
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, 2015 |  | $ | 4,268 |  | $ | (16,795) |  | $ | (67,890) |  | $ | (178) |  | $ | (80,595)
﻿Other comprehensive income before income taxes: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Net change in unrealized gain |  |  | 26,882 |  |  | — |  |  | — |  |  | 2,090 |  |  | 28,972
﻿Reclassification of net (gain) losses realized and included in earnings |  |  | (346) |  |  | — |  |  | 1,437 |  |  | — |  |  | 1,091
﻿Amortization of unrealized net loss on securities transferred to HTM |  |  | — |  |  | 798 |  |  | — |  |  | — |  |  | 798
﻿Income tax expense |  |  | 9,751 |  |  | 292 |  |  | 525 |  |  | 764 |  |  | 11,332
﻿Balance, March 31, 2016 |  | $ | 21,053 |  | $ | (16,289) |  | $ | (66,978) |  | $ | 1,148 |  | $ | (61,066)
﻿Balance, December 31, 2016 |  | $ | (28,679) |  | $ | (14,392) |  | $ | (72,501) |  | $ | (4,960) |  | $ | (120,532)
﻿Other comprehensive income before income taxes: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Net change in unrealized gain (loss) |  |  | 2,319 |  |  | — |  |  | — |  |  | (1,135) |  |  | 1,184
﻿Reclassification of net losses 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)
﻿
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) |  |  | 2017 |  |  | 2016 |  | the income statement
﻿Gain on sale of AFS securities |  | $ | — |  | $ | 346 |  | Securities transactions
﻿Tax effect |  |  | — |  |  | (127) |  | Income taxes
﻿Net of tax |  |  | — |  |  | 219 |  | Net income
﻿Amortization of unrealized net loss on securities transferred to HTM |  |  | (650) |  |  | (798) |  | Interest income
﻿Tax effect |  |  | 266 |  |  | 292 |  | Income taxes
﻿Net of tax |  |  | (384) |  |  | (506) |  | Net income
﻿Amortization of defined benefit pension and post-retirement items |  |  | (1,387) |  |  | (1,437) |  | Employee benefits expense (b)
﻿Tax effect |  |  | 504 |  |  | 525 |  | Income taxes
﻿Net of tax |  |  | (883) |  |  | (912) |  | Net income
﻿Total reclassifications, net of tax |  | $ | (1,267) |  | $ | (1,199) |  | 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=66004124&loc=SL7669686-108580 + Details
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