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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 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 |  |  | 38,835 |  |  | — |  |  | — |  |  | 1,162 |  |  | 39,997
﻿Reclassification of net (gain) loss 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)
﻿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) |  |  | 21,026 |  |  | — |  |  | — |  |  | (1,232) |  |  | 19,794
﻿Reclassification of net losses realized and included in earnings |  |  | — |  |  | — |  |  | 4,144 |  |  | 335 |  |  | 4,479
﻿Valuation adjustment for pension plan amendment (a) |  |  | — |  |  | — |  |  | 17,315 |  |  | — |  |  | 17,315
﻿Other valuation adjustments for employee benefit plan |  |  | — |  |  | — |  |  | (9,185) |  |  | — |  |  | (9,185)
﻿Amortization of unrealized net loss on securities transferred to HTM |  |  | — |  |  | 2,726 |  |  | — |  |  | — |  |  | 2,726
﻿Income tax expense (benefit) |  |  | 7,649 |  |  | 1,012 |  |  | 4,416 |  |  | (329) |  |  | 12,748
﻿Balance, September 30, 2017 |  | $ | (15,302) |  | $ | (12,678) |  | $ | (64,643) |  | $ | (5,528) |  | $ | (98,151)
﻿
| (a) |  | For further discussion of the pension plan amendment, see Note 11 – Retirement Plans.
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) |  |  | 2017 |  |  | 2016 |  | the statement of income
﻿Gain on sale of AFS securities |  | $ | — |  | $ | 1,435 |  | Securities transactions
﻿Tax effect |  |  | — |  |  | (502) |  | Income taxes
﻿Net of tax |  |  | — |  |  | 933 |  | Net income
﻿Amortization of unrealized net loss on securities transferred to HTM |  |  | (2,726) |  |  | (2,736) |  | Interest income
﻿Tax effect |  |  | 1,012 |  |  | 1,029 |  | Income taxes
﻿Net of tax |  |  | (1,714) |  |  | (1,707) |  | Net income
﻿Amortization of defined benefit pension and post-retirement items |  |  | (4,144) |  |  | (4,395) |  | Employee benefits expense (b)
﻿Tax effect |  |  | 1,491 |  |  | 1,538 |  | Income taxes
﻿Net of tax |  |  | (2,653) |  |  | (2,857) |  | Net income
﻿Amortization of loss on terminated cash flow hedges |  |  | (335) |  |  | — |  | Interest income
﻿Tax effect |  |  | 123 |  |  | — |  | Income taxes
﻿Net of tax |  |  | (212) |  |  | — |  | Net income
﻿Total reclassifications, net of tax |  | $ | (4,579) |  | $ | (3,631) |  | 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 11 – Retirement Plans for additional details).

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