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Fair Value (Details 2) (USD $)
0 Months Ended 3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2011
Apr. 02, 2013
Private placement bond
Subsequent Event
Dec. 13, 2012
Recurring basis
Significant Unobservable Inputs (Level 3)
Private placement bond
Maximum
Mar. 31, 2013
Nonrecurring basis
Fair Value
OREO
Dec. 31, 2012
Nonrecurring basis
Fair Value
OREO
Mar. 31, 2012
Nonrecurring basis
Fair Value
OREO
Mar. 31, 2013
Nonrecurring basis
Fair Value
Non-acquired impaired loans
Dec. 31, 2012
Nonrecurring basis
Fair Value
Non-acquired impaired loans
Mar. 31, 2012
Nonrecurring basis
Fair Value
Non-acquired impaired loans
Mar. 31, 2013
Nonrecurring basis
Significant Unobservable Inputs (Level 3)
OREO
Dec. 31, 2012
Nonrecurring basis
Significant Unobservable Inputs (Level 3)
OREO
Mar. 31, 2012
Nonrecurring basis
Significant Unobservable Inputs (Level 3)
OREO
Mar. 31, 2013
Nonrecurring basis
Significant Unobservable Inputs (Level 3)
Non-acquired impaired loans
Dec. 31, 2012
Nonrecurring basis
Significant Unobservable Inputs (Level 3)
Non-acquired impaired loans
Mar. 31, 2012
Nonrecurring basis
Significant Unobservable Inputs (Level 3)
Non-acquired impaired loans
Mar. 31, 2013
Nonrecurring basis
Significant Unobservable Inputs (Level 3)
Discounted appraisals
OREO
Minimum
Mar. 31, 2013
Nonrecurring basis
Significant Unobservable Inputs (Level 3)
Discounted appraisals
OREO
Maximum
Mar. 31, 2013
Nonrecurring basis
Significant Unobservable Inputs (Level 3)
Discounted appraisals
Impaired loans
Minimum
Mar. 31, 2013
Nonrecurring basis
Significant Unobservable Inputs (Level 3)
Discounted appraisals
Impaired loans
Maximum
Fair Value                                            
Other Real Estate $ 70,690,000 $ 66,505,000 $ 83,169,000 $ 83,871,000     $ 29,508,000 $ 66,505,000 $ 37,961,000 $ 4,418,000 $ 42,356,000 $ 5,491,000 $ 29,508,000 $ 66,505,000 $ 37,961,000 $ 4,418,000 $ 42,356,000 $ 5,491,000        
Fair value discount (as a percent)           1.00%                                
Securities paid off by the issuer         3,800,000                                  
Realized gain on the payoff of the security         $ 31,000                                  
Quantitative Information about Level 3 Fair Value Measurements                                            
Collateral discounts                                         0.00% 25.00%
Collateral discounts and estimated costs to sell                                     0.00% 25.00%