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, 2012
Property
Sep. 30, 2011
Sep. 30, 2012
Property
Sep. 30, 2011
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Accrued interest on loans receivable $ 7,467,000   $ 7,467,000   $ 7,829,000
Loans receivable 517,000,000   517,000,000   797,100,000
Loans receivable reclassified as loans held for sale 25,321,000 31,353,000 89,792,000 72,037,000  
Sale of Loans Held for Sale 44,878,000 51,744,000 183,036,000 96,011,000  
Purchase of Loans Receivable 0 0 82,885,000     
Due period for considering loans as impaired     90 days or more    
Non-Accrual Loans 44,692,000   44,692,000   52,378,000
Delinquent loans (defined as 30 days or more past due), excluding loans held for sale 20,239,000   20,239,000   35,191,000
Other real estate owned with a combined net carrying value 364,000   364,000   180,000
Net of valuation adjustment 257,000   257,000    
Number of real estate properties 2,000,000   2,000,000    
Restructured payments net carrying value 12,900,000   12,900,000    
Loans held for sale excluded from TDR loans receivable 38,000,000   38,000,000   51,600,000
Principal and interest due     6 months    
Reserve relating to these loans was included in the allowance for loan losses 4,800,000   4,800,000   14,200,000
Serviced loans sold to unaffiliated parties 277,700,000 187,900,000 277,700,000 187,900,000  
Colorado [Member]
          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Other real estate owned with a combined net carrying value         180,000
Number of real estate properties         1,000,000
California [Member]
          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Transfer of net carrying value from loans receivable and loans held for sale to other real estate owned     2,600,000    
Number of real estate properties 5,000,000   5,000,000    
Commercial Property [Member]
          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Purchase of Loans Receivable     15,200,000    
Residential Property [Member]
          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Purchase of Loans Receivable     $ 67,400,000