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Accounting Policies and Basis of Presentation (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended | 3 Months Ended |  |  | 0 Months Ended
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Sep. 30, 2012 | Sep. 30, 2012 | Jun. 30, 2012 Noncovered Loans | Sep. 30, 2012 Noncovered Loans | Mar. 31, 2012 Noncovered Loans | Jul. 31, 2012 Debenture Of 1998 Subordinated Debt | Jul. 31, 2012 Debenture Of 1998 Secured Debt | Jul. 31, 2012 Preferred Securities of 1998 Securities Sold under Agreements to Repurchase | Jul. 15, 2012 Securitization and Sale of Revolving Mortgage Loans in 2005 Secured Debt
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Maximum period of fair value refinement after transaction closing date |  | 1 year |  |  |  |  |  |  |
Adjustments to acquisition gains | $ 0 |  |  |  |  |  |  |  |
Threshold amount for individual impairment analysis |  |  |  | 500 | 1,000 |  |  |  |
Impact of change in estimation method on allowance |  |  | 2,615 |  |  |  |  |  |
Stated interest rate for debt (percent) |  |  |  |  |  | 8.05% |  |  |
Face value of debt instrument |  |  |  |  |  | 154,640 |  | 150,000 |
Amount of debt redeemed |  |  |  |  |  | 163,569 |  | 158,661 |
Redeemed debt face amount (percent) |  |  |  |  |  | 102.42% |  |  |
Reductions in long-term borrowings from repayments of debt |  |  |  |  |  |  | 154,640 |  | 21,565
Prepayment penalty interest rate (percent) |  |  |  |  |  |  | 2.42% |  |
Prepayment penalty expense |  |  |  |  |  |  | $ 3,630 |  |

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