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 6 Months Ended
Jun. 30, 2013
Quarters
Property
SecurityLoan
Jun. 30, 2012
Mar. 31, 2010
Quarters
Jun. 30, 2013
Property
SecurityLoan
Jun. 30, 2012
Dec. 31, 2012
Property
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Accrued interest on loans receivable $ 7,441,000     $ 7,441,000   $ 7,581,000
Loans receivable 691,600,000     691,600,000   524,000,000
Loans receivable reclassified as loans held for sale 4,637,000 26,990,000   8,010,000 64,471,000  
Sale of loans held for sale 30,956,000 109,461,000   59,721,000 138,158,000  
Look-back period 12   12      
Revised look-back period     8      
Allowance for loan losses, provision recognized       (5,900,000)    
Due period for considering loans as impaired       90 days or more    
Non-accrual loans 27,975,000     27,975,000   37,279,000
Percentage decrease in loans on non-accrual status, excluding loans held for sale       25.00%    
Delinquent loans (defined as 30 days or more past due), excluding loans held for sale 14,909,000     14,909,000   16,467,000
Percentage decrease in delinquent loans excluding loans held for sale       9.50%    
Number of real estate properties 2     2   2
Net valuation adjustment 126,000     126,000    
Net carrying value of other real estate property 900,000     900,000   774,000
Restructured payments net carrying value 787,000 2,791,000   2,268,000 7,696,000  
Properties subject to restructured payments net carrying value 9     9    
Loans held for sale excluded from TDR loans receivable 29,000,000     29,000,000   35,700,000
Principal and interest due       6 months    
Reserve relating to these loans was included in the allowance for loan losses 3,300,000     3,300,000   3,600,000
Serviced loans sold to unaffiliated parties $ 330,400,000 $ 268,800,000   $ 330,400,000 $ 268,800,000  
Most recent four quarters [Member]
            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Percentage of weighted look-back period 50.00%   60.00%      
Oldest four quarters [Member]
            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Percentage of weighted look-back period 17.00%   40.00%      
Next four quarters [Member]
            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Percentage of weighted look-back period 33.00%