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 9 Months Ended
Sep. 30, 2013
Property
Jun. 30, 2013
Quarters
Sep. 30, 2012
Mar. 31, 2010
Quarters
Sep. 30, 2013
Property
Sep. 30, 2012
Dec. 31, 2012
Property
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Accrued interest on loans receivable $ 6,957,000       $ 6,957,000   $ 7,581,000
Loans receivable 629,700,000       629,700,000   524,000,000
Loans receivable reclassified as loans held for sale 0   25,321,000   8,010,000 89,792,000  
Sale of loans held for sale 11,906,000   44,878,000   71,627,000 183,036,000  
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 22,776,000       22,776,000   37,279,000
Percentage decrease in loans on non-accrual status, excluding loans held for sale         38.90%    
Delinquent loans (defined as 30 days or more past due) 15,998,000       15,998,000   16,467,000
Percentage decrease in delinquent loans excluding loans held for sale         2.80%    
Number of real estate properties 1       1   2
Net carrying value of other real estate property 290,000       290,000   774,000
TDR loans receivable 28,000,000       28,000,000   35,700,000
Principal and interest due         6 months    
Reserve relating to these loans was included in the allowance for loan losses 944,000.0       944,000.0   3,600,000
Net carrying value of other real estate property 3,100,000       3,100,000    
Serviced loans sold to unaffiliated parties $ 332,900,000   $ 277,700,000   $ 332,900,000 $ 277,700,000  
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%