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Stockholders' Equity and Comprehensive Income (Components of Comprehensive Income-Gross and Net of Tax) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Stockholders' Equity and Other Comprehensive Income [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income, Gross |  |  |  |  |  |  |  |  | $ 7,065 | $ 76,141 | $ 26,253
Unrealized holding gains during the period, Gross |  |  |  |  |  |  |  |  | 70,140 | 44,643 | 102,514
Non Credit Portion Of Other Than Temporary Impairment Losses Recognized In Other Comprehensive Income Gross |  |  |  |  |  |  |  |  | 1,682 | 5,256 | (8,659)
Amortization of net unrealized gains on HTM securities, Gross |  |  |  |  |  |  |  |  | (3,097) | (11,708) | 914
Reclassification adjustment for (gains) losses included in net income, Gross |  |  |  |  |  |  |  |  | (1,987) | (454) | 38,392
Net unrealized gains, Gross |  |  |  |  |  |  |  |  | 66,738 | 37,737 | 133,161
Net actuarial loss, Gross |  |  |  |  |  |  |  |  | (16,799) | (12,045) | 2,824
Reversal of amortization of net actuarial loss, Gross |  |  |  |  |  |  |  |  | 4,172 | 4,134 | 5,274
Reversal of amortization of curtailment benefit, Gross |  |  |  |  |  |  |  |  |  |  | (1,387)
Reversal of amortization of prior service cost, Gross |  |  |  |  |  |  |  |  | 150 | 150 | (508)
Defined benefit pension plans, Gross |  |  |  |  |  |  |  |  | (12,477) | (7,761) | 6,203
Comprehensive income, Gross |  |  |  |  |  |  |  |  | 61,326 | 106,117 | 165,617
Net income, Tax |  |  |  |  |  |  |  |  | (12,800) | 10,600 | (10,145)
Unrealized holding gains during the period, Tax |  |  |  |  |  |  |  |  | 24,548 | 15,625 | 35,880
Portion of OTTI recognized in OCI, Tax |  |  |  |  |  |  |  |  | 589 | 1,840 | (3,030)
Amortization of net unrealized gains on HTM securities, Tax |  |  |  |  |  |  |  |  | (1,084) | (4,098) | 320
Reclassification adjustment for (gains) losses included in net income, Tax |  |  |  |  |  |  |  |  | (695) | (159) | 13,437
Net unrealized gains, Tax |  |  |  |  |  |  |  |  | 23,358 | 13,208 | 46,607
Net actuarial loss, Tax |  |  |  |  |  |  |  |  | 5,880 | (4,216) | 988
Reversal of amortization of net actuarial loss, Tax |  |  |  |  |  |  |  |  | 1,460 | 1,447 | 1,846
Reversal of amortization of curtailment benefit, Tax |  |  |  |  |  |  |  |  |  |  | (485)
Reversal of amortization of prior service cost, Tax |  |  |  |  |  |  |  |  | 53 | 53 | (178)
Defined benefit pension and post-retirement plans, Tax |  |  |  |  |  |  |  |  | (4,367) | (2,716) | 2,171
Comprehensive income, Tax |  |  |  |  |  |  |  |  | 6,191 | 21,092 | 38,633
Net income | 16,133 | (20,142) | 2,325 | 21,549 | 23,775 | 17,197 | 18,766 | 5,803 | 19,865 | 65,541 | 36,398
Unrealized holding gains during the period, Net |  |  |  |  |  |  |  |  | 45,592 | 29,018 | 66,634
Non-credit portion of other-than-temporary impairment losses recognized in other comprehensive income, net of deferred income tax |  |  |  |  |  |  |  |  | 1,093 | 3,416 | (5,629)
Amortization of net unrealized gains on HTM securiites, Net |  |  |  |  |  |  |  |  | (2,013) | (7,610) | 594
Reclassification adjustment for (gains) losses included in net income, Net |  |  |  |  |  |  |  |  | (1,292) | (295) | 24,955
Net Unrealized gains, Net |  |  |  |  |  |  |  |  | 43,380 | 24,529 | 86,554
Net actuarial loss, Net |  |  |  |  |  |  |  |  | (10,919) | (7,829) | 1,836
Reversal of amortization of net actuarial loss, Net |  |  |  |  |  |  |  |  | 2,712 | 2,687 | 3,428
Reversal of amortization of curtailment benefit, Net |  |  |  |  |  |  |  |  |  |  | (902)
Reversal of amortization of prior service cost, Net |  |  |  |  |  |  |  |  | 97 | 97 | (330)
Defined benefit pension and post-retirement plans, Net |  |  |  |  |  |  |  |  | (8,110) | (5,045) | 4,032
Comprehensive income, Net | $ 26,263 | $ (9,122) | $ 20,693 | $ 17,301 | $ (17,421) | $ 47,591 | $ 42,365 | $ 12,490 | $ 55,135 | $ 85,025 | $ 126,984

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- Definition The net gain (loss) previously recognized in other comprehensive income that is a reclassification adjustment of other comprehensive income as a result of being recognized as a component of net periodic benefit cost for the period. + 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=6920043&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 13 -URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e653-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph i -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 158 -Paragraph 7 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 158 -Paragraph 4 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(3) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The adjustment out of other comprehensive income for actuarial gains or losses recognized as a component of net periodic benefit cost during the period, after tax. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e689-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(3) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 158 -Paragraph 4 -Subparagraph c, d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: 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=6920043&loc=d3e637-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition The after-tax amount of other than temporary impairment (OTTI) loss on a debt security, categorized as either Available-for-sale or Held-to-maturity, related to factors other than credit losses when the entity does not intend to sell the security and it is not more likely than not that the entity will be required to sell the security before recovery of its amortized cost basis. This amount, net of applicable taxes, includes the portion attributable to the noncontrolling interest, if any; this amount is also referred to as the amount incurred by the reporting entity or the consolidated entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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