Annual report pursuant to Section 13 and 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 $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Balance at Beginning of Period $ 22,587,000 $ 36,620,000
Origination of Loans Held for Sale 116,829,000 60,238,000
Reclassification from Loans Receivable to Loans Held for Sale 95,611,000 110,290,000
Reclassification from Loans Held for Sale to Other Real Estate Owned (360,000)  
Reclassification from Loans Held for Sale to Loans Receivable (1,779,000)  
Sales of Loans Held for Sale (220,232,000) (180,494,000)
Principal Payoffs and Amortization (604,000) (1,164,000)
Valuation Adjustments (3,746,000) (2,903,000)
Balance at End of Period 8,306,000 22,587,000
Real Estate Loans [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Balance at Beginning of Period 11,068,000 3,666,000
Origination of Loans Held for Sale      
Reclassification from Loans Receivable to Loans Held for Sale 46,960,000 56,428,000
Reclassification from Loans Held for Sale to Other Real Estate Owned (360,000)  
Reclassification from Loans Held for Sale to Loans Receivable (1,647,000)  
Sales of Loans Held for Sale (54,669,000) (48,841,000)
Principal Payoffs and Amortization (228,000) (52,000)
Valuation Adjustments (1,124,000) (133,000)
Balance at End of Period    11,068,000
Commercial and Industrial Loans [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Balance at Beginning of Period 11,519,000 32,954,000
Origination of Loans Held for Sale 116,829,000 60,238,000
Reclassification from Loans Receivable to Loans Held for Sale 48,651,000 53,862,000
Reclassification from Loans Held for Sale to Other Real Estate Owned     
Reclassification from Loans Held for Sale to Loans Receivable (132,000)  
Sales of Loans Held for Sale (165,563,000) (131,653,000)
Principal Payoffs and Amortization (376,000) (1,112,000)
Valuation Adjustments (2,622,000) (2,770,000)
Balance at End of Period 8,306,000 11,519,000
Consumer Loans [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Balance at Beginning of Period      
Origination of Loans Held for Sale      
Reclassification from Loans Receivable to Loans Held for Sale      
Reclassification from Loans Held for Sale to Other Real Estate Owned     
Reclassification from Loans Held for Sale to Loans Receivable     
Sales of Loans Held for Sale      
Principal Payoffs and Amortization      
Valuation Adjustments      
Balance at End of Period