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Loans - Recorded Investment in Nonaccrual Loans by Class of Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total over 90 days still on accrual loans      
Total nonaccrual and nonperforming loans 6,356 8,301
Total nonaccrual loans [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total nonaccrual and nonperforming loans 6,356 8,301
Real estate [Member] | Non-owner occupied [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total over 90 days still on accrual loans      
Total nonaccrual and nonperforming loans 2,195 1,910
Real estate [Member] | Owner occupied [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total nonaccrual and nonperforming loans 1,243 446
Consumer [Member] | Originated for portfolio [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total nonaccrual and nonperforming loans   157
Commercial [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total nonaccrual and nonperforming loans 714 47
Commercial [Member] | Real estate [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total over 90 days still on accrual loans      
Other consumer [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total over 90 days still on accrual loans      
Single-family residential [Member] | Real estate [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total nonaccrual and nonperforming loans 113 736
Multi-family residential [Member] | Real estate [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total nonaccrual and nonperforming loans 2,082 4,996
Home equity lines of credit [Member] | Consumer [Member] | Originated for portfolio [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total nonaccrual and nonperforming loans   157
Home equity lines of credit [Member] | Consumer [Member] | Purchased for portfolio [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total nonaccrual and nonperforming loans $ 9 $ 9