Annual report pursuant to Section 13 and 15(d)

Loans - Additional Information (Detail)

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Loans - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Property
Dec. 31, 2012
Property
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accrued interest receivable $ 7,055,000 $ 7,581,000  
Loans receivable 2,177,498,000 1,986,051,000  
Loans receivable reclassified as loans held for sale 8,010,000 95,611,000 110,290,000
Sale of loans held for sale 96,754,000 220,232,000  
Allowance for off-balance sheet items 1,200,000 1,800,000  
Loans on non-accrual status 25,877,000 37,279,000  
Percentage decrease in loans on non-accrual status, excluding loans held for sale 30.60%    
Delinquent loans (defined as 30 days or more past due) 16,274,000 16,467,000  
Percentage decrease in delinquent loans excluding loans held for sale 1.20%    
Number of real estate properties 3 2  
Net carrying value of other real estate property 756,000 774,000  
Net valuation adjustment 56,000 0  
TDR loans receivable 30,000,000 35,700,000 51,400,000
Principal and interest due 6 months    
Reserves relating to loans included in allowance for loan losses 2,800,000 3,600,000 14,200,000
Net carrying value 8,600,000    
Serviced loans sold to unaffiliated parties 350,000,000 297,200,000  
Loans and Finance Receivables [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accrued interest receivable 7,055,000 7,581,000  
Minimum [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Due period for considering loans as impaired 90 days    
Securities Pledged as Collateral [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable $ 568,700,000 $ 524,000,000