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Foreclosed Real Estate and Repossessed Personal Property - Changes in Foreclosed Real Estate Portfolio (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Foreclosed Assets [Line Items]      
Foreclosed real estate, beginning of period $ 27,663 $ 19,983 $ 27,826
Plus: New foreclosed real estate 5,389 27,163 20,423
Less: Proceeds from sale of foreclosed real estate (13,524) (13,397) (17,616)
Plus: Gain (loss) on sale of foreclosed real estate 729 (41) 587
Less: Writedowns and losses charged to expense (9,346) (6,045) (11,237)
Foreclosed real estate, end of period $ 10,911 $ 27,663 $ 19,983