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Summary of Assets for Which Nonrecurring Change in Fair Value has been Recorded (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Collateral dependent impaired loans | $ 15,519 | $ 11,301
Fair Value, Measurements, Nonrecurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Collateral dependent impaired loans | 15,519 | 11,301
Foreclosed assets | 14,423 | 15,364
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Collateral dependent impaired loans | 15,212 | 11,016
Foreclosed assets | 14,423 | 14,777
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Collateral dependent impaired loans | 307 | 285
Foreclosed assets |  | $ 587

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