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Allowance for Loan Losses - Allowance for Loan Losses (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Balance at beginning of the period       $ 18,270       $ 18,882 $ 18,270 $ 18,882 $ 19,064
Total loans charged-off                 6,250 5,943 6,680
Total loan recoveries                 (2,052) (1,807) (1,216)
Net loans charged-off                 4,198 4,136 5,464
Total provision charged to operating expense (997) 104 729 2,084 1,715 1,041 209 559 1,920 3,524 5,282
Balance at the end of the period 15,992       18,270       15,992 18,270 18,882
Commercial [Member]
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Total loans charged-off                 2,532 2,388 967
Total loan recoveries                 668 782 163
Total provision charged to operating expense                 (756) (1,360) (1,267)
Commercial [Member] | Owner Occupied Real Estate [Member]
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Total loans charged-off                 138 418 190
Total loan recoveries                 65 547 26
Commercial [Member] | Non-owner Occupied Real Estate [Member]
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Total loans charged-off                 937 1,196 401
Total loan recoveries                 71 98 113
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    
Total loan recoveries                       
Commercial [Member] | Commercial and Industrial [Member]
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Total loans charged-off                 1,275 774 376
Total loan recoveries                 532 137 24
Real Estate [Member]
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Total loans charged-off                 1,055 597 956
Total loan recoveries                 114 77 10
Total provision charged to operating expense                 (1,132) (1,262) (1,299)
Real Estate [Member] | Residential Mortgage [Member]
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Total loans charged-off                 1,055 597 956
Total loan recoveries                 114 77 10
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                 2,663 2,958 4,757
Total loan recoveries                 1,270 948 1,043
Total provision charged to operating expense                 (32) (902) (2,716)
Consumer [Member] | Direct Installment [Member]
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Total loans charged-off                 333 327 661
Total loan recoveries                 488 84 96
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                 1,178 1,294 1,676
Total loan recoveries                 658 737 803
Consumer [Member] | Home Equity [Member]
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Total loans charged-off                 1,152 1,337 2,420
Total loan recoveries                 $ 124 $ 127 $ 144