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Stockholders' Equity (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning Balance |  |  |  | $ (134,402) | $ (120,532)
Net change in unrealized gain (loss) |  | $ (25,242) | $ 5,949 | (110,895) | 19,794
Reclassification of net losses realized and included in earnings |  | 2,547 | 1,374 | 6,560 | 4,479
Valuation adjustment for pension plan amendment |  |  |  |  | 17,315
Other valuation adjustments for employee benefit plans |  |  | 1,597 | (9,039) | (9,185)
Amortization of unrealized net loss on securities transferred to HTM |  | 747 | 977 | 2,427 | 2,726
Income tax expense (benefit) |  | (4,978) | 3,609 | (25,170) | 12,748
Ending Balance |  | (220,179) | (98,151) | (220,179) | (98,151)
Accumulated Other Comprehensive Loss Available for Sale Securities [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning Balance |  |  |  | (29,512) | (28,679)
Net change in unrealized gain (loss) |  |  |  | (92,477) | 21,026
Income tax expense (benefit) |  |  |  | (20,985) | 7,649
Ending Balance |  | (101,004) | (15,302) | (101,004) | (15,302)
Held to Maturity Securities Transferred from AFS [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning Balance |  |  |  | (14,585) | (14,392)
Amortization of unrealized net loss on securities transferred to HTM |  |  |  | 2,427 | 2,726
Income tax expense (benefit) |  |  |  | 550 | 1,012
Ending Balance |  | (12,708) | (12,678) | (12,708) | (12,678)
Employee Benefit Plans [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning Balance |  |  |  | (79,078) | (72,501)
Reclassification of net losses realized and included in earnings |  |  |  | 3,719 | 4,144
Valuation adjustment for pension plan amendment |  |  |  |  | 17,315
Other valuation adjustments for employee benefit plans |  |  |  | (9,039) | (9,185)
Income tax expense (benefit) |  |  |  | (1,205) | 4,416
Ending Balance |  | (83,193) | (64,643) | (83,193) | (64,643)
Gains and Losses on Cash Flow Hedges [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning Balance |  |  |  | (11,227) | (4,960)
Net change in unrealized gain (loss) |  |  |  | (18,418) | (1,232)
Reclassification of net losses realized and included in earnings |  |  |  | 2,841 | 335
Income tax expense (benefit) |  |  |  | (3,530) | (329)
Ending Balance |  | $ (23,274) | $ (5,528) | (23,274) | (5,528)
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 | [1],[2] |  |  | $ (3,719) | $ (4,144)
[1] | Amounts in parentheses indicate reduction in net income.
[2] | 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 Other Comprehensive Income (Loss), Amortization On Unrealized Holding Gain (Loss) On Transfers To Held-to-maturity Securities, Before Tax + References No definition available. + Details
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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=84228862&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=84228862&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=84228862&loc=SL7669686-108580 + Details
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