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Allowance for Loan Losses - Allowance for Loan Losses (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]        
Balance at beginning of the period $ 18,880 $ 18,374 $ 18,270 $ 18,882
Total loans charged-off 1,520 1,167 4,780 3,396
Total loan recoveries 384 320 1,440 1,273
Net loans charged-off 1,136 847 3,340 2,123
Total provision charged to operating expense 104 1,041 2,917 1,809
Balance at the end of the period 17,848 18,568 17,848 18,568
Commercial [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off 756 394 1,998 752
Total loan recoveries 151 61 347 473
Total provision charged to operating expense 741 625 1,543 320
Commercial [Member] | Owner Occupied Real Estate [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off    92 138 95
Total loan recoveries 15   61 352
Commercial [Member] | Non Owner Occupied Real Estate [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off 539 81 730 109
Total loan recoveries 35   38 7
Commercial [Member] | Residential Development [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off          
Total loan recoveries          
Commercial [Member] | Development & Spec Land Loans [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off 182   182  
Total loan recoveries          
Commercial [Member] | Commercial and Industrial [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off 35 221 948 548
Total loan recoveries 101 61 248 114
Real Estate [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off 43 247 602 451
Total loan recoveries 3 42 11 74
Total provision charged to operating expense (381) 254 606 900
Real Estate [Member] | Residential mortgage [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off 43 247 602 451
Total loan recoveries 3 42 11 74
Real Estate [Member] | Residential Construction [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off          
Total loan recoveries          
Real Estate [Member] | Mortgage Warehouse [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off          
Total loan recoveries          
Consumer [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off 722 526 2,180 2,193
Total loan recoveries 230 217 1,082 726
Total provision charged to operating expense (256) 162 769 589
Consumer [Member] | Direct Installment [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off 87 90 282 261
Total loan recoveries 10 28 458 63
Consumer [Member] | Direct Installment Purchased [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off          
Total loan recoveries          
Consumer [Member] | Indirect Installment [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off 329 313 953 922
Total loan recoveries 157 173 529 563
Consumer [Member] | Home Equity [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off 306 123 945 1,010
Total loan recoveries $ 63 $ 16 $ 95 $ 100