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Stockholders' Equity (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | $ (80,595) | $ (50,074) | $ (35,379)
Net change in unrealized gain (loss) | (57,346) | (21,270) | 14,821
Reclassification of net (gain) loss realized and included in earnings | 4,016 | 3,010 | 390
Valuation adjustment for employee benefit plans | (12,748) | (33,971) | (41,244)
Amortization of unrealized net loss on securities transferred to held to maturity | 3,830 | 3,530 | 3,297
Income tax (benefit) expense | (22,311) | (18,180) | (8,041)
Ending Balance | (120,532) | (80,595) | (50,074)
Available for Sale Securities [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | 4,268 | 18,001 | 8,263
Net change in unrealized gain (loss) | (49,839) | (21,581) | 15,413
Reclassification of net (gain) loss realized and included in earnings | (1,912) | (165) |
Valuation adjustment for employee benefit plans |  |  |
Amortization of unrealized net loss on securities transferred to held to maturity |  |  |
Income tax (benefit) expense | (18,804) | (8,013) | 5,675
Ending Balance | (28,679) | 4,268 | 18,001
HTM Securities Transferred from AFS [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | (16,795) | (19,074) | (21,189)
Net change in unrealized gain (loss) |  |  |
Reclassification of net (gain) loss realized and included in earnings |  |  |
Valuation adjustment for employee benefit plans |  |  |
Amortization of unrealized net loss on securities transferred to held to maturity | 3,830 | 3,530 | 3,297
Income tax (benefit) expense | 1,427 | 1,251 | 1,182
Ending Balance | (14,392) | (16,795) | (19,074)
Employee Benefit Plans [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | (67,890) | (48,626) | (22,453)
Net change in unrealized gain (loss) |  |  |
Reclassification of net (gain) loss realized and included in earnings | 5,928 | 3,175 | 390
Valuation adjustment for employee benefit plans | (12,748) | (33,971) | (41,244)
Amortization of unrealized net loss on securities transferred to held to maturity |  |  |
Income tax (benefit) expense | (2,209) | (11,532) | (14,681)
Ending Balance | (72,501) | (67,890) | (48,626)
Cash Flow Hedges [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | (178) | (375) |
Net change in unrealized gain (loss) | (7,507) | 311 | (592)
Reclassification of net (gain) loss realized and included in earnings |  |  |
Valuation adjustment for employee benefit plans |  |  |
Amortization of unrealized net loss on securities transferred to held to maturity |  |  |
Income tax (benefit) expense | (2,725) | 114 | (217)
Ending Balance | $ (4,960) | $ (178) | $ (375)

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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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