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, 2012
SecurityLoan
Property
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accrued interest on loans receivable $ 7,581,000 $ 7,829,000
Loans receivable 524,000,000 797,100,000
Loans receivable reclassified as loans held for sale 95,611,000 110,290,000
Sale of Loans Held for Sale 220,232,000 180,494,000
Purchase of Loans Receivable 82,885,000  
Allowance for off-balance sheet items 1,800,000 3,000,000
Due period for considering loans as impaired 90 days or more  
Non-Accrual Loans 37,279,000 52,378,000
Percentage decrease in loans on non-accrual status, excluding loans held for sale 28.80%  
Delinquent loans (defined as 30 days or more past due), excluding loans held for sale 16,467,000 35,191,000
Percentage decrease in delinquent loans excluding loans held for sale 53.10%  
Number of real estate properties 2  
Net carrying value of other real estate property 774,000  
Number of properties 6  
Transfer of net carrying value from loans receivable and loans held for sale to other real estate owned 3,100,000  
Net valuation adjustment 433,000  
Restructured payments net carrying value 15,000,000  
Properties subject to restructured payments net carrying value 59  
Loans held for sale excluded from TDR loans receivable 35,700,000 51,600,000
Principal and interest due 6 months  
Reserve relating to these loans was included in the allowance for loan losses 3,600,000 14,200,000
Serviced loans sold to unaffiliated parties 297,200,000 218,500,000
Commercial Property [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Purchase of Loans Receivable 15,200,000 0
Residential Property [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Purchase of Loans Receivable 67,400,000 0
Colorado [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of real estate properties   1
Net carrying value of other real estate property   $ 180,000