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Non-performing Loans and Impaired Loans - Nonaccrual, 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
Jun. 30, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual $ 9,844 $ 9,748
Loans Past Due Over 90 Days Still Accruing 42 49
Non Performing TDRs 3,178 3,426
Performing TDRs 5,614 5,054
Total Non-Performing Loans 18,678 18,277
Commercial [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 4,708 4,014
Loans Past Due Over 90 Days Still Accruing 17 45
Non Performing TDRs 1,591 2,116
Performing TDRs 1,927 1,296
Total Non-Performing Loans 8,243 7,471
Commercial [Member] | Owner Occupied Real Estate [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 1,578 293
Loans Past Due Over 90 Days Still Accruing      
Non Performing TDRs 46 222
Performing TDRs 755 778
Total Non-Performing Loans 2,379 1,293
Commercial [Member] | Non-owner Occupied Real Estate [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 2,299 2,289
Loans Past Due Over 90 Days Still Accruing    45
Non Performing TDRs 406 1,117
Performing TDRs 1,172 518
Total Non-Performing Loans 3,877 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 49 182
Loans Past Due Over 90 Days Still Accruing      
Non Performing TDRs      
Performing TDRs      
Total Non-Performing Loans 49 182
Commercial [Member] | Commercial and Industrial [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 782 1,250
Loans Past Due Over 90 Days Still Accruing 17   
Non Performing TDRs 1,139 777
Performing TDRs      
Total Non-Performing Loans 1,938 2,027
Real Estate [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 2,830 2,459
Loans Past Due Over 90 Days Still Accruing 2 2
Non Performing TDRs 1,351 999
Performing TDRs 2,489 2,686
Total Non-Performing Loans 6,672 6,146
Real Estate [Member] | Residential Mortgage [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 2,830 2,459
Loans Past Due Over 90 Days Still Accruing 2 2
Non Performing TDRs 1,077 719
Performing TDRs 2,489 2,686
Total Non-Performing Loans 6,398 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 274 280
Performing TDRs      
Total Non-Performing Loans 274 280
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 2,306 3,275
Loans Past Due Over 90 Days Still Accruing 23 2
Non Performing TDRs 236 311
Performing TDRs 1,198 1,072
Total Non-Performing Loans 3,763 4,660
Consumer [Member] | Direct Installment [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 371 202
Loans Past Due Over 90 Days Still Accruing      
Non Performing TDRs      
Performing TDRs      
Total Non-Performing Loans 371 202
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 537 531
Loans Past Due Over 90 Days Still Accruing 23 2
Non Performing TDRs      
Performing TDRs      
Total Non-Performing Loans 560 533
Consumer [Member] | Home Equity [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 1,398 2,542
Loans Past Due Over 90 Days Still Accruing      
Non Performing TDRs 236 311
Performing TDRs 1,198 1,072
Total Non-Performing Loans $ 2,832 $ 3,925