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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Non-Recurring Basis (Parenthetical) (Detail) (Nonrecurring Basis [Member], USD $) | Mar. 31, 2013 | Dec. 31, 2012
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Nonperforming loans held for sale [Member] | Small Business Administration Loans Held for Sale [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Non-Performing Loans Held for sale | $ 484,000,000 | $ 484,000
Nonperforming loans held for sale [Member] | Commercial term loans [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Non-Performing Loans Held for sale | 1,800,000 |
Impaired Loans [Member] | Real estate loans [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impaired Loans | 4,000,000 | 8,700,000
Impaired Loans [Member] | Commercial and Industrial Loans [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impaired Loans | 21,000,000 | 27,000,000
Impaired Loans [Member] | Consumer Loans [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impaired Loans | 900,000 | 1,000,000
Other Real Estate Owned [Member] | Small Business Administration Loans Held for Sale [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Non-Performing Loans Held for sale | 387,000 |
Other Real Estate Owned [Member] | Real estate loans [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Non-Performing Loans Held for sale |  | 774,000
Other Real Estate Owned [Member] | Commercial property loan [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Non-Performing Loans Held for sale | $ 513,000 |

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- Definition Non-Performing loans held for sale fair value disclosure. + References No definition available. + Details
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