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Other Real Estate Owned - Additional information (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
properties
Dec. 31, 2011
properties
Dec. 31, 2010
Medical Office Condiminium [Member]
properties
Dec. 31, 2012
Mini-Storage Facilities [Member]
properties
Schedule of Other Real Estate Owned [Line Items]        
Number of properties foreclosed upon 6 3 12 2
Net realizable values of foreclosed properties $ 2,337,000 $ 532,000   $ 2,098,000
Proceeds from OREO sales 2,349,000 2,472,000    
Net gain (loss) on disposition 12,000 615,000   (6,000)
Income received on operation of foreclosed assets       $ 90,000