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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Non-Recurring Basis (Detail) (Nonrecurring Basis [Member], USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Unrealized Losses on Non-performing Loans Held for Sale |  | $ 3,747,000
Unrealized Losses Impaired Loans | 572,000 | 580,000
Unrealized Losses Other Real Estate Owned | 7,000 | 301,000
Significant Observable Inputs With No Active Market With Identical Characteristics [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Non-Performing Loans Held for sale | 2,306,000 | 484,000
Impaired Loans | 25,326,000 | 27,844,000
Other Real Estate Owned | 900,000 | 774,000
Significant Unobservable Inputs [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impaired Loans | $ 544,000 | $ 8,888,000

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- Definition Impaired Loans fair value disclosure. + References No definition available. + Details
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- Definition Non-Performing loans held for sale fair value disclosure. + References No definition available. + Details
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- Definition Other Real Estate Owned Fair Value Disclosure. + References No definition available. + Details
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- Definition Unrealized Gain Loss On Impaired Loans Held For Sale + References No definition available. + Details
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- Definition Unrealized losses on non performing loans held for sale. + References No definition available. + Details
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- Details
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