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Fair Value Measurements - Level 3 Inputs (Details) (USD $)
9 Months Ended
Sep. 30, 2013
Level 3
Dec. 31, 2012
Level 3
Sep. 30, 2013
Fair Value
Dec. 31, 2012
Fair Value
Sep. 30, 2013
Nonrecurring
Impaired loans
Level 3
Dec. 31, 2012
Nonrecurring
Impaired loans
Level 3
Sep. 30, 2013
Nonrecurring
Impaired loans
Fair Value
Dec. 31, 2012
Nonrecurring
Impaired loans
Fair Value
Sep. 30, 2013
Minimum
Real estate construction and other land loans
Nonrecurring
Impaired loans
Sep. 30, 2013
Maximum
Real estate construction and other land loans
Nonrecurring
Impaired loans
Sep. 30, 2013
Weighted Average
Commercial and industrial
Nonrecurring
Impaired loans
Sep. 30, 2013
Weighted Average
Real estate construction and other land loans
Nonrecurring
Impaired loans
Sep. 30, 2013
Weighted Average
Equity loans and lines of credit
Nonrecurring
Impaired loans
Fair Value Inputs, Assets, Quantitative Information [Line Items]                          
Loans receivable $ 509,109,000 $ 388,834,000 $ 509,109,000 $ 388,834,000 $ 671,000 $ 5,290,000 $ 671,000 $ 5,290,000          
Adjustments for lack of sales activity                     (40.00%)    
Adjustments for absorption rate, discount rate and lot value appreciation/depreciation                 0.00% (30.00%)   (25.00%)  
Fair Value Inputs, Discount for Adjustments in Home Values and Selling Costs                         (15.00%)