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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Balance at beginning of period $ 6,043,000 $ 55,993,000 $ 8,306,000 $ 22,587,000
Origination of loans held for sale 22,834,000 34,723,000 45,978,000 60,589,000
Reclassification from loans receivable to loans held for sale 4,637,000 26,990,000 8,010,000 64,471,000
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)   (1,779,000)
Sales of loans held for sale (30,956,000) (109,461,000) (59,721,000) (138,158,000)
Principal payoffs and amortization (5,000) (204,000) (20,000) (431,000)
Valuation adjustments   (1,124,000)   (1,781,000)
Balance at end of period 2,553,000 5,138,000 2,553,000 5,138,000
Real estate loans [Member]
        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Balance at beginning of period    10,879,000    11,068,000
Origination of loans held for sale            
Reclassification from loans receivable to loans held for sale 780,000 15,148,000 780,000 32,224,000
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)   (1,647,000)
Sales of loans held for sale    (21,909,000)    (38,703,000)
Principal payoffs and amortization    (58,000)    (169,000)
Valuation adjustments   (1,124,000)   (1,124,000)
Balance at end of period 780,000 1,289,000 780,000 1,289,000
Commercial and industrial loans [Member]
        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Balance at beginning of period 6,043,000 45,114,000 8,306,000 11,519,000
Origination of loans held for sale 22,834,000 34,723,000 45,978,000 60,589,000
Reclassification from loans receivable to loans held for sale 3,857,000 11,842,000 7,230,000 32,247,000
Reclassification from loans held for sale to other real estate owned         
Reclassification from loans held for sale to loans receivable   (132,000)   (132,000)
Sales of loans held for sale (30,956,000) (87,552,000) (59,721,000) (99,455,000)
Principal payoffs and amortization (5,000) (146,000) (20,000) (262,000)
Valuation adjustments        (657,000)
Balance at end of period 1,773,000 3,849,000 1,773,000 3,849,000
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