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Loans and Allowance - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans held for sale $ 8,295   $ 8,295     $ 7,235    
Loans 4,238,205   4,238,205     3,924,865    
Loans - allowance for loan losses 62,550 $ 68,367 62,550 $ 68,367 $ 62,801 63,964 $ 69,583 $ 67,870
Decrease in allowance for loan losses     1,414          
Allowance for impaired financing receivables change     319          
Impaired financing receivable, allowance 3,088   3,088     2,769    
Allowance for loan losses, write-offs (recoveries)     1,831 (497)        
Provision for loan losses 417 0 417 0        
Other commercial loans                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans 143,007   143,007     35,018    
Increase in loans     107,989          
Real estate loans - Residential                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans 689,621   689,621     647,315    
Loans - allowance for loan losses 12,311 14,928 12,311 14,928 $ 13,269 13,152 $ 13,908 $ 15,077
Impaired financing receivable, allowance 542   542     194    
Provision for loan losses (72) $ 1,622 462 $ 524        
Real estate loans - Commercial and farmland                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans 1,705,647   1,705,647     1,672,661    
Impaired financing receivable, allowance $ 488   $ 488     $ 1,120    
Percentage of troubled debt restructured loans     44.00%