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Non-performing Loans and Impaired Loans - Commercial Loans Individually Evaluated for Impairment by Class of Loans (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
Schedule Of Financial Receivables [Line Items]        
Unpaid Principal Balance total $ 7,887 $ 12,865 $ 7,887 $ 12,865
Total ending loans balance 7,919 12,904 7,919 12,904
Allowance For Loan Loss Allocated 1,316 2,403 1,316 2,403
Average Balance in Impaired Loans total 10,136 12,044 9,794 9,346
Cash/Accrual Interest Income Recognized, Total 24 70 87 82
Commercial [Member]
        
Schedule Of Financial Receivables [Line Items]        
Unpaid Principal Balance With no recorded allowance 5,063 7,565 5,063 7,565
Recorded Investment With no recorded allowance 5,083 7,604 5,083 7,604
Allowance For Loan Loss Allocated With no recorded allowance            
Average Balance in Impaired Loans With no recorded allowance 7,094 6,730 7,319 4,064
Cash/Accrual Interest Income Recognized, With no recorded allowance 24 70 64 75
Unpaid Principal Balance With an allowance recorded 2,824 5,300 2,824 5,300
Recorded Investment With an allowance recorded 2,836 5,300 2,836 5,300
Allowance For Loan Loss Allocated 1,316 2,403 1,316 2,403
Average Balance in Impaired Loans With an allowance recorded 3,042 5,314 2,475 5,282
Cash/Accrual Interest Income Recognized, With an allowance recorded       23 7
Commercial [Member] | Owner Occupied Real Estate [Member]
        
Schedule Of Financial Receivables [Line Items]        
Unpaid Principal Balance With no recorded allowance 1,329 4,457 1,329 4,457
Recorded Investment With no recorded allowance 1,331 4,460 1,331 4,460
Allowance For Loan Loss Allocated With no recorded allowance            
Average Balance in Impaired Loans With no recorded allowance 1,959 3,810 2,685 1,978
Cash/Accrual Interest Income Recognized, With no recorded allowance 16    43 3
Unpaid Principal Balance With an allowance recorded    903    903
Recorded Investment With an allowance recorded    903    903
Allowance For Loan Loss Allocated    450    450
Average Balance in Impaired Loans With an allowance recorded (1) 910    1,109
Cash/Accrual Interest Income Recognized, With an allowance recorded          1
Commercial [Member] | Non Owner Occupied Real Estate [Member]
        
Schedule Of Financial Receivables [Line Items]        
Unpaid Principal Balance With no recorded allowance 3,167 2,521 3,167 2,521
Recorded Investment With no recorded allowance 3,170 2,542 3,170 2,542
Allowance For Loan Loss Allocated With no recorded allowance            
Average Balance in Impaired Loans With no recorded allowance 3,814 2,429 3,298 1,920
Cash/Accrual Interest Income Recognized, With no recorded allowance 8 70 21 72
Unpaid Principal Balance With an allowance recorded 487 2,938 487 2,938
Recorded Investment With an allowance recorded 487 2,938 487 2,938
Allowance For Loan Loss Allocated 302 1,065 302 1,065
Average Balance in Impaired Loans With an allowance recorded 491 2,943 502 2,843
Cash/Accrual Interest Income Recognized, With an allowance recorded          
Commercial [Member] | Residential Development [Member]
        
Schedule Of Financial Receivables [Line Items]        
Unpaid Principal Balance With no recorded allowance            
Recorded Investment With no recorded allowance            
Allowance For Loan Loss Allocated With no recorded allowance            
Average Balance in Impaired Loans With no recorded allowance            
Cash/Accrual Interest Income Recognized, With no recorded allowance            
Unpaid Principal Balance With an allowance recorded          
Recorded Investment With an allowance recorded          
Allowance For Loan Loss Allocated          
Average Balance in Impaired Loans With an allowance recorded          
Cash/Accrual Interest Income Recognized, With an allowance recorded          
Commercial [Member] | Development & Spec Land Loans [Member]
        
Schedule Of Financial Receivables [Line Items]        
Unpaid Principal Balance With no recorded allowance 21 131 21 131
Recorded Investment With no recorded allowance 21 131 21 131
Allowance For Loan Loss Allocated With no recorded allowance            
Average Balance in Impaired Loans With no recorded allowance 24 109 25 37
Cash/Accrual Interest Income Recognized, With no recorded allowance            
Unpaid Principal Balance With an allowance recorded 149 658 149 658
Recorded Investment With an allowance recorded 149 658 149 658
Allowance For Loan Loss Allocated 48 615 48 615
Average Balance in Impaired Loans With an allowance recorded 173 660 165 523
Cash/Accrual Interest Income Recognized, With an allowance recorded         6
Commercial [Member] | Commercial and Industrial [Member]
        
Schedule Of Financial Receivables [Line Items]        
Unpaid Principal Balance With no recorded allowance 546 456 546 456
Recorded Investment With no recorded allowance 561 471 561 471
Allowance For Loan Loss Allocated With no recorded allowance            
Average Balance in Impaired Loans With no recorded allowance 1,297 382 1,311 129
Cash/Accrual Interest Income Recognized, With no recorded allowance            
Unpaid Principal Balance With an allowance recorded 2,188 801 2,188 801
Recorded Investment With an allowance recorded 2,200 801 2,200 801
Allowance For Loan Loss Allocated 966 273 966 273
Average Balance in Impaired Loans With an allowance recorded 2,379 801 1,808 807
Cash/Accrual Interest Income Recognized, With an allowance recorded      $ 23