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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, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]        
Balance at beginning of the period $ 15,660 $ 19,565 $ 15,992 $ 18,270
Total loans charged-off 1,541 1,801 3,133 3,259
Total loan recoveries 300 387 1,221 1,056
Net loans charged-off (recovered) 1,241 1,414 1,912 2,203
Total provision charged to operating expense 1,741 104 2,080 2,917
Balance at the end of the period 16,160 18,880 16,160 18,880
Commercial [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off 1,093 825 1,415 1,242
Total loan recoveries 87 126 585 196
Total provision charged to operating expense 1,563 (940) 1,682 802
Commercial [Member] | Owner Occupied Real Estate [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off    6    138
Total loan recoveries 4 14 10 46
Commercial [Member] | Non Owner Occupied Real Estate [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off    45 22 191
Total loan recoveries 10 1 85 3
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       173   
Total loan recoveries 55    55   
Commercial [Member] | Commercial and Industrial [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off 1,093 774 1,220 913
Total loan recoveries 18 111 435 147
Real Estate [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off 31 416 225 559
Total loan recoveries 12 5 19 8
Total provision charged to operating expense 697 675 (290) 986
Real Estate [Member] | Residential Mortgage [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off 31 416 225 559
Total loan recoveries 12 5 19 8
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 Warehousing [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 417 560 1,493 1,458
Total loan recoveries 201 256 617 852
Total provision charged to operating expense (519) 994 688 1,025
Consumer [Member] | Direct Installment [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off 74 88 151 195
Total loan recoveries 10 54 49 448
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 306 271 874 624
Total loan recoveries 165 202 431 372
Consumer [Member] | Home Equity [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off 37 201 468 639
Total loan recoveries $ 26    $ 137 $ 32