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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 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 (loss) |  |  | 21,026 |  |  | — |  |  | — |  |  | (1,232) |  |  | 19,794
﻿Reclassification of net loss realized and included in earnings |  |  | — |  |  | — |  |  | 4,144 |  |  | 335 |  |  | 4,479
﻿Valuation adjustment for pension plan amendment |  |  | — |  |  | — |  |  | 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)
﻿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 losses |  |  | (92,477) |  |  | — |  |  | — |  |  | (18,418) |  |  | (110,895)
﻿Reclassification of net losses realized and included in earnings |  |  | — |  |  | — |  |  | 3,719 |  |  | 2,841 |  |  | 6,560
﻿Other valuation adjustments for employee benefit plan |  |  | — |  |  | — |  |  | (9,039) |  |  | — |  |  | (9,039)
﻿Amortization of unrealized net loss on securities transferred to HTM |  |  | — |  |  | 2,427 |  |  | — |  |  | — |  |  | 2,427
﻿Income tax expense (benefit) |  |  | (20,985) |  |  | 550 |  |  | (1,205) |  |  | (3,530) |  |  | (25,170)
﻿Balance, September 30, 2018 |  | $ | (101,004) |  | $ | (12,708) |  | $ | (83,193) |  | $ | (23,274) |  | $ | (220,179)
﻿
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) |  |  | 2018 |  |  | 2017 |  | the statement of income
﻿Amortization of unrealized net loss on securities transferred to HTM |  | $ | (2,427) |  | $ | (2,726) |  | Interest income
﻿Tax effect |  |  | 550 |  |  | 1,012 |  | Income taxes
﻿Net of tax |  |  | (1,877) |  |  | (1,714) |  | Net income
﻿Amortization of defined benefit pension and post-retirement items |  |  | (3,719) |  |  | (4,144) |  | Other noninterest expense (b)
﻿Tax effect |  |  | 842 |  |  | 1,491 |  | Income taxes
﻿Net of tax |  |  | (2,877) |  |  | (2,653) |  | Net income
﻿Reclassification of unrealized gain on cash flow hedges |  |  | 1,264 |  |  | — |  | Interest income
﻿Tax effect |  |  | (286) |  |  | — |  | Income taxes
﻿Net of tax |  |  | 978 |  |  | — |  | Net income
﻿Amortization of loss on terminated cash flow hedges |  |  | (4,105) |  |  | (335) |  | Interest income
﻿Tax effect |  |  | 930 |  |  | 123 |  | Income taxes
﻿Net of tax |  |  | (3,175) |  |  | (212) |  | Net income
﻿Total reclassifications, net of tax |  | $ | (6,951) |  | $ | (4,579) |  | Net income
| (a) |  | Amounts in parentheses 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 12 – 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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