Quarterly report pursuant to Section 13 or 15(d)

Loans - Additional Information (Detail)

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Loans - Additional Information (Detail) (USD $)
 3 Months Ended
Mar. 31, 2013
Property
SecurityLoan
Mar. 31, 2012
Dec. 31, 2012
Property
Receivables [Abstract]      
Accrued interest on loans receivable $ 7,526,000   $ 7,581,000
Loans receivable 614,800,000   524,000,000
Loans receivable reclassified as loans held for sale 3,373,000 37,481,000  
Sale of Loans Held for Sale 28,765,000 28,697,000  
Due period for considering loans as impaired 90 days or more    
Non-Accrual Loans 32,893,000   37,279,000
Percentage decrease in loans on non-accrual status, excluding loans held for sale 11.80%    
Delinquent loans (defined as 30 days or more past due), excluding loans held for sale 18,397,000   16,467,000
Percentage increase in delinquent loans excluding loans held for sale 11.70%    
Number of properties 1    
Transfer of net carrying value from loans receivable and loans held for sale to other real estate owned 513,000    
Net valuation adjustment 126,000    
Net carrying value of other real estate property     774,000
Number of real estate properties     2
Restructured payments net carrying value 1,600,000    
Properties subject to restructured payments net carrying value 4    
Loans held for sale excluded from TDR loans receivable 31,700,000   35,700,000
Principal and interest due 6 months    
Reserve relating to these loans was included in the allowance for loan losses 3,700,000   3,600,000
Serviced loans sold to unaffiliated parties $ 316,200,000   $ 211,100,000