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Investment Securities - Narrative (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Schedule of Investments [Line Items] |  |  |
Other than temporary impairment on investment securities | $ 54,000 | $ 0 | $ 23,000
Amortized cost of securities available-for-sale | 1,099,658,000 | 801,147,000 |
Amortized cost of held-to-maturity securities | 401,390,000 | 820,224,000 |
Federal home loan bank stock | 59,000,000 | 60,700,000 |
Federal reserve bank stock | 6,900,000 | 6,900,000 |
Federal Home Loan Bank (FHLB) advance borrowings | 1,364,000,000 | 1,548,000,000 |
Money pledged for government and trust department deposits | 655,000,000 | 813,000,000 |
Money pledged to secure repurchase agreements | 667,000,000 | 669,000,000 |
Money pledged as collateral for FHLB advance borrowings | 41,000,000 | 66,000,000 |
Percentage of amount greater than shareholder's equity | 10.00% |  |
Proceeds from sale of investment securities | 0 | 610,000,000 |
Available-for-sale securities, pre-tax gain |  | 28,800,000 |
Available-for-sale securities, after tax gain |  | 18,700,000 |
U.S. Treasury and sponsored entities callable notes |  |  |
Schedule of Investments [Line Items] |  |  |
Available-for-sale securities | 695,700,000 |  |
U.S. Government sponsored entity asset-backed securities |  |  |
Schedule of Investments [Line Items] |  |  |
Asset-backed securities mortgage portfolio, maturity term | 15 years |  |
Amortized cost of securities available-for-sale | 401,882,000 | 427,300,000 |
Amortized cost of held-to-maturity securities | 400,820,000 | 818,232,000 |
Residential mortgage-backed securities |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized cost of securities available-for-sale | 277,800,000 |  |
Amortized cost of held-to-maturity securities | 100,000 |  |
Collateralized mortgage-backed securities |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized cost of securities available-for-sale | 124,100,000 |  |
Amortized cost of held-to-maturity securities | 400,700,000 |  |
U.S. Government sponsored entity mortgage-backed securities |  |  |
Schedule of Investments [Line Items] |  |  |
Proceeds from sale of investment securities |  |  | 460,200,000
Available-for-sale securities, pre-tax gain |  |  | 11,900,000
Available-for-sale securities, after tax gain |  |  | $ 7,700,000
Minimum | U.S. Treasury and sponsored entities callable notes |  |  |
Schedule of Investments [Line Items] |  |  |
Callable securities, maturity term | 9 years |  |
Maximum | U.S. Treasury and sponsored entities callable notes |  |  |
Schedule of Investments [Line Items] |  |  |
Callable securities, maturity term | 15 years |  |

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