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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 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 (loss) before income taxes: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Net change in unrealized gain |  |  | 41,990 |  |  | — |  |  | — |  |  | 3,611 |  |  | 45,601
﻿Reclassification of net (gain) loss realized and included in earnings |  |  | (1,114) |  |  | — |  |  | 2,916 |  |  | — |  |  | 1,802
﻿Amortization of unrealized net loss on securities transferred to HTM |  |  | — |  |  | 1,628 |  |  | — |  |  | — |  |  | 1,628
﻿Income tax expense |  |  | 14,970 |  |  | 625 |  |  | 1,066 |  |  | 1,316 |  |  | 17,977
﻿Balance, June 30, 2016 |  | $ | 30,174 |  | $ | (15,792) |  | $ | (66,040) |  | $ | 2,117 |  | $ | (49,541)
﻿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 losses realized and included in earnings |  |  | — |  |  | — |  |  | 3,105 |  |  | — |  |  | 3,105
﻿Valuation adjustment for pension plan amendment (a) |  |  | — |  |  | — |  |  | 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)
﻿
| (a) |  | For further discussion on the pension plan amendment, see Note 11 – Retirement Plans.
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) |  |  | 2017 |  |  | 2016 |  | the income statement
﻿Gain on sale of AFS securities |  | $ | — |  | $ | 1,114 |  | Securities transactions
﻿Tax effect |  |  | — |  |  | (390) |  | Income taxes
﻿Net of tax |  |  | — |  |  | 724 |  | Net income
﻿Amortization of unrealized net loss on securities transferred to HTM |  |  | (1,749) |  |  | (1,628) |  | Interest income
﻿Tax effect |  |  | 657 |  |  | 625 |  | Income taxes
﻿Net of tax |  |  | (1,092) |  |  | (1,003) |  | Net income
﻿Amortization of defined benefit pension and post-retirement items |  |  | (3,105) |  |  | (2,916) |  | Employee benefits expense (b)
﻿Tax effect |  |  | 1,114 |  |  | 1,066 |  | Income taxes
﻿Net of tax |  |  | (1,991) |  |  | (1,850) |  | Net income
﻿Total reclassifications, net of tax |  | $ | (3,083) |  | $ | (2,129) |  | 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 employ ee benefits expense (see Note 11 – Retirement Plans for additional details).

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