Quarterly report pursuant to Section 13 or 15(d)

Loans - Loans Receivable to Loans Held for Sale (Detail)

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Loans - Loans Receivable to Loans Held for Sale (Detail) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Real Estate Loans [Member]
Mar. 31, 2012
Real Estate Loans [Member]
Mar. 31, 2013
Commercial and Industrial Loans [Member]
Mar. 31, 2012
Commercial and Industrial Loans [Member]
Dec. 31, 2012
Consumer Loans [Member]
Dec. 31, 2011
Consumer Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]                
Balance at Beginning of Period $ 8,306,000 $ 22,587,000   $ 11,068,000 $ 8,306,000 $ 11,519,000      
Origination of Loans Held For Sale 23,144,000 25,866,000       23,144,000 25,866,000    
Reclassification from Loans Receivable to Loans Held for Sale 3,373,000 37,481,000   17,076,000 3,373,000 20,405,000    
Reclassification from Loans Receivable to Other Real Estate Owned   (360,000)   (360,000)        
Sales of Loans Held for Sale (28,765,000) (28,697,000)   (16,794,000) (28,765,000) (11,903,000)    
Principal Payoffs and Amortization (15,000) (227,000)   (111,000) (15,000) (116,000)    
Valuation Adjustments   (657,000)       (657,000)    
Balance at End of Period $ 6,043,000 $ 55,993,000   $ 10,879,000 $ 6,043,000 $ 45,114,000