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Stockholders' Equity (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  | $ (120,532) |  |
Net change in unrealized gain (loss) |  | (425) | $ (57,346) | $ (21,270)
Reclassification of net (gain) loss realized and included in earnings |  | 5,801 | 4,016 | 3,010
Valuation adjustment for pension plan amendment |  | 17,315 |  |
Other valuation adjustments for employee benefit plans |  | (10,929) | (12,748) | (33,971)
Amortization of unrealized net loss on securities transferred to held to maturity |  | 3,786 | 3,830 | 3,530
Income tax expense (benefit) |  | (4,088) | 22,311 | 18,180
Reclassification of certain tax effects |  |  |  |
Ending Balance |  | (134,402) | (120,532) |
Available for Sale Securities [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  | (28,679) | 4,268 | 18,001
Net change in unrealized gain (loss) |  | 6,903 | (49,839) | (21,581)
Reclassification of net (gain) loss realized and included in earnings |  |  | (1,912) | (165)
Valuation adjustment for pension plan amendment |  |  |  |
Valuation adjustment for employee benefit plans |  |  |  |
Other valuation adjustments for employee benefit plans |  |  |  |
Amortization of unrealized net loss on securities transferred to held to maturity |  |  |  |
Income tax expense (benefit) |  | 1,067 | (18,804) | (8,013)
Reclassification of certain tax effects | [1] | (6,669) |  |
Ending Balance |  | (29,512) | (28,679) | 4,268
HTM Securities Transferred from AFS [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  | (14,392) | (16,795) | (19,074)
Net change in unrealized gain (loss) |  |  |  |
Reclassification of net (gain) loss realized and included in earnings |  |  |  |
Valuation adjustment for pension plan amendment |  |  |  |
Valuation adjustment for employee benefit plans |  |  |  |
Other valuation adjustments for employee benefit plans |  |  |  |
Amortization of unrealized net loss on securities transferred to held to maturity |  | 3,786 | 3,830 | 3,530
Income tax expense (benefit) |  | 1,393 | 1,427 | 1,251
Reclassification of certain tax effects | [1] | (2,586) |  |
Ending Balance |  | (14,585) | (14,392) | (16,795)
Employee Benefit Plans [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  | (72,501) | (67,890) | (48,626)
Net change in unrealized gain (loss) |  |  |  |
Reclassification of net (gain) loss realized and included in earnings |  | 5,201 | 5,928 | 3,175
Valuation adjustment for pension plan amendment |  | (17,315) |  |
Valuation adjustment for employee benefit plans |  |  | (12,748) | (33,971)
Other valuation adjustments for employee benefit plans |  | (10,929) |  |
Amortization of unrealized net loss on securities transferred to held to maturity |  |  |  |
Income tax expense (benefit) |  | 4,228 | (2,209) | (11,532)
Reclassification of certain tax effects | [1] | (13,936) |  |
Ending Balance |  | (79,078) | (72,501) | (67,890)
Cash Flow Hedges [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  | (4,960) | (178) | (375)
Net change in unrealized gain (loss) |  | (7,328) | (7,507) | 311
Reclassification of net (gain) loss realized and included in earnings |  | 600 |  |
Valuation adjustment for pension plan amendment |  |  |  |
Valuation adjustment for employee benefit plans |  |  |  |
Other valuation adjustments for employee benefit plans |  |  |  |
Amortization of unrealized net loss on securities transferred to held to maturity |  |  |  |
Income tax expense (benefit) |  | (2,600) | (2,725) | 114
Reclassification of certain tax effects | [1] | (2,139) |  |
Ending Balance |  | (11,227) | (4,960) | (178)
Accumulated Other ComprehensiveLoss, Net [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  | (120,532) | (80,595) | (50,074)
Net change in unrealized gain (loss) |  | (425) | (57,346) | (21,270)
Reclassification of net (gain) loss realized and included in earnings |  | 5,801 | 4,016 | 3,010
Valuation adjustment for pension plan amendment |  | (17,315) |  |
Valuation adjustment for employee benefit plans |  |  | (12,748) | (33,971)
Other valuation adjustments for employee benefit plans |  | (10,929) |  |
Amortization of unrealized net loss on securities transferred to held to maturity |  | 3,786 | 3,830 | 3,530
Income tax expense (benefit) |  | 4,088 | (22,311) | (18,180)
Reclassification of certain tax effects | [1] | (25,330) |  |
Ending Balance |  | (134,402) | (120,532) | $ (80,595)
Amount Reclassified from Accumulated Other Comprehensive Income [Member] | Employee Benefit Plans [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Valuation adjustment for pension plan amendment | [2],[3] | $ (5,201) | $ (5,928) |
[1] | Represents the reclassification of stranded income tax effects to Retained Earnings upon adoption of ASU 2018-02. The adjustment is discussed in more detail later in this footnote.
[2] | Amounts in parenthesis indicate reduction in net income.
[3] | These AOCI components are included in the computation of net periodic pension and post-retirement cost that is reported with employee benefits expense (see footnote 16 for additional information).

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e681-108580 Reference 3: 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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