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Non-performing Loans and Impaired Loans - Non-accrual, Loans Past Due Over 90 Days Still on Accrual, and Troubled Debt Restructured ("TDRs") by Class of Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual $ 10,828 $ 9,748
Loans Past Due Over 90 Days Still Accruing 62 49
Non Performing TDRs    3,426
Performing TDRs 3,469 5,054
Total Non-Performing Loans 14,359 18,277
Commercial [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 5,853 4,014
Loans Past Due Over 90 Days Still Accruing    45
Non Performing TDRs    2,116
Performing TDRs 3,469 1,296
Total Non-Performing Loans 9,322 7,471
Commercial [Member] | Owner Occupied Real Estate [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 2,715 293
Loans Past Due Over 90 Days Still Accruing      
Non Performing TDRs    222
Performing TDRs 781 778
Total Non-Performing Loans 3,496 1,293
Commercial [Member] | Non Owner Occupied Real Estate [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 2,591 2,289
Loans Past Due Over 90 Days Still Accruing    45
Non Performing TDRs    1,117
Performing TDRs 1,563 518
Total Non-Performing Loans 4,154 3,969
Commercial [Member] | Residential Development [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual      
Loans Past Due Over 90 Days Still Accruing      
Non Performing TDRs      
Performing TDRs      
Total Non-Performing Loans      
Commercial [Member] | Development & Spec Land Loans [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual    182
Loans Past Due Over 90 Days Still Accruing      
Non Performing TDRs      
Performing TDRs      
Total Non-Performing Loans    182
Commercial [Member] | Commercial and Industrial [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 547 1,250
Loans Past Due Over 90 Days Still Accruing      
Non Performing TDRs    777
Performing TDRs 1,125   
Total Non-Performing Loans 1,672 2,027
Real Estate [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 2,471 2,459
Loans Past Due Over 90 Days Still Accruing    2
Non Performing TDRs    999
Performing TDRs    2,686
Total Non-Performing Loans 2,471 6,146
Real Estate [Member] | Residential Mortgage [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 2,471 2,459
Loans Past Due Over 90 Days Still Accruing    2
Non Performing TDRs    719
Performing TDRs    2,686
Total Non-Performing Loans 2,471 5,866
Real Estate [Member] | Residential Construction [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual      
Loans Past Due Over 90 Days Still Accruing      
Non Performing TDRs    280
Performing TDRs      
Total Non-Performing Loans    280
Real Estate [Member] | Mortgage Warehousing [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual      
Loans Past Due Over 90 Days Still Accruing      
Non Performing TDRs      
Performing TDRs      
Total Non-Performing Loans      
Consumer [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 2,504 3,275
Loans Past Due Over 90 Days Still Accruing 62 2
Non Performing TDRs    311
Performing TDRs    1,072
Total Non-Performing Loans 2,566 4,660
Consumer [Member] | Direct Installment [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 259 202
Loans Past Due Over 90 Days Still Accruing 3   
Non Performing TDRs      
Performing TDRs      
Total Non-Performing Loans 262 202
Consumer [Member] | Direct Installment Purchased [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual      
Loans Past Due Over 90 Days Still Accruing      
Non Performing TDRs      
Performing TDRs      
Total Non-Performing Loans      
Consumer [Member] | Indirect Installment [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 539 531
Loans Past Due Over 90 Days Still Accruing 59 2
Non Performing TDRs      
Performing TDRs      
Total Non-Performing Loans 598 533
Consumer [Member] | Home Equity [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 1,706 2,542
Loans Past Due Over 90 Days Still Accruing      
Non Performing TDRs    311
Performing TDRs    1,072
Total Non-Performing Loans $ 1,706 $ 3,925