Annual report pursuant to Section 13 and 15(d)

Loans - Troubled Debt Restructuring, Disaggregated by Loan Class (Parenthetical) (Detail)

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Loans - Troubled Debt Restructuring, Disaggregated by Loan Class (Parenthetical) (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Retail [Member]
   
Financing Receivable, Modifications [Line Items]    
Loan modifications made through deferrals principal payments $ 357,000  
Amount of loan modification through extensions of maturity 175,000.0 1,300,000
Other [Member]
   
Financing Receivable, Modifications [Line Items]    
Loan modifications made through deferrals principal payments 527,000 2,400,000
Residential Property [Member]
   
Financing Receivable, Modifications [Line Items]    
Loan modifications made through deferrals principal payments   2,700,000
Unsecured [Member]
   
Financing Receivable, Modifications [Line Items]    
Loan modifications made through deferrals principal payments 909,000 1,600,000
Loan modifications made through reductions of principal or accrued interest payments 723,000 11,500,000
Amount of loan modification through extensions of maturity 3,600,000 1,500,000
Secured By Real Estate [Member]
   
Financing Receivable, Modifications [Line Items]    
Loan modifications made through deferrals principal payments 5,400,000 2,400,000
Loan modifications made through reductions of principal or accrued interest payments 318,000 9,100,000
Amount of loan modification through extensions of maturity 1,900,000 2,700,000
Commercial Lines of Credit [Member]
   
Financing Receivable, Modifications [Line Items]    
Loan modifications made through reductions of principal or accrued interest payments 188,000  
SBA Loans [Member]
   
Financing Receivable, Modifications [Line Items]    
Loan modifications made through deferrals principal payments 504,000 5,700,000
Loan modifications made through reductions of principal or accrued interest payments $ 447,000 $ 957,000