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Investment Securities (Narrative) (Details) (USD $) | 3 Months Ended | 12 Months Ended |  |  |  |  |  | 3 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2011 years | Dec. 31, 2011 years | Dec. 31, 2010 | Dec. 31, 2009 | Mar. 31, 2011 | Dec. 31, 2011 U.S. Treasury And Sponsored Entities Callable Notes [Member] | Dec. 31, 2011 U.S. Treasury And Sponsored Entities Discount Notes [Member] | Dec. 31, 2011 Collateralized Mortgage-Backed Securities [Member] | Dec. 31, 2011 Residential Mortgage-Backed Securities [Member] | Dec. 31, 2011 U.S. Government Sponsored Entities Asset-Backed Securities [Member] | Jun. 30, 2011 U.S. Government Sponsored Entities Asset-Backed Securities [Member] | Mar. 31, 2011 U.S. Government Sponsored Entities Asset-Backed Securities [Member] | Dec. 31, 2010 U.S. Government Sponsored Entities Asset-Backed Securities [Member] | Dec. 31, 2011 U.S. Government Sponsored Entity Mortgage-Backed Securities [Member] | Sep. 30, 2011 U.S. Government Sponsored Entity Mortgage-Backed Securities [Member] | Jun. 30, 2011 U.S. Government Sponsored Entity Mortgage-Backed Securities [Member] | Dec. 31, 2010 U.S. Government Sponsored Entity Mortgage-Backed Securities [Member] | Dec. 31, 2009 U.S. Government Sponsored Entity Mortgage-Backed Securities [Member] | Mar. 31, 2011 U.S. Government Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities |  |  |  |  |  | $ 269,100,000 | $ 100,900,000 |  |  |  | $ 191,000,000 | $ 105,400,000 |  | $ 45,700,000 | $ 212,800,000 |  | $ 460,200,000 | $ 204,300,000 |
Other than temporary impairment on investment securities |  |  | 23,000 | 613,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number in years until U.S. government residential mortgage-backed securities mature |  | 15 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortized cost of securities available-for-sale | 801,147,000 | 801,147,000 | 1,274,258,000 |  |  |  |  | 0 | 427,300,000 | 427,300,000 |  |  | 990,204,000 |  |  |  |  |  |
Amortized cost of securities held-to-maturity |  |  |  |  |  |  |  | 818,200,000 | 100,000 |  |  |  |  |  |  |  |  |  |
Federal reserve bank stock | 6,900,000 | 6,900,000 | 6,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal home loan bank stock | 60,700,000 | 60,700,000 | 61,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Callable securities final maturity in years, minimum |  | 9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Callable securities final maturity in years, maximum | 10 | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal Home Loan Bank (FHLB) advance borrowings | 1,548,000,000 | 1,548,000,000 | 1,481,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
money pledged for government and trust department deposits | 813,000,000 | 813,000,000 | 736,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
money pledged to secure repurchase agreements | 669,000,000 | 669,000,000 | 668,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of amount greater than shareholder's equity |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of investment securities |  | 610,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of investment securities, pre-tax gain |  | 28,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money pledged as collateral for FHLB advance borrowings | 66,000,000 | 66,000,000 | 77,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities, pre-tax gain | 19,530,000 | 19,530,000 | 34,740,000 |  |  |  |  |  |  | 16,995,000 |  |  | 30,633,000 |  | 3,500,000 | 15,400,000 | 11,900,000 | 7,300,000 | 6,600,000
Municipal securities sold | 900,000 | 900,000 |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Held-to-maturity securities | 820,224,000 | 820,224,000 | 673,570,000 |  |  |  |  |  |  |  |  |  |  | 24,300,000 |  |  |  |  |
Held-to-maturity securities, pretax gain |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,400,000 |  |  |  |  |
Municipal securities, pretax gain | $ 15,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Bonds or similar securities issued by state, city, or local governments or the agencies operated by state, city, or local governments which are short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8, 9 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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- Definition The cash inflow associated with the sale of other investments not otherwise defined in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 31 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3521-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 -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 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3574-108585 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -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 115 -Paragraph 18 -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 FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3179-108585 + Details
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