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 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Balance at beginning of period $ 2,553,000 $ 5,138,000 $ 8,306,000 $ 22,587,000
Origination of loans held for sale 17,135,000 25,722,000 63,113,000 86,311,000
Reclassification from loans receivable to loans held for sale 0 25,321,000 8,010,000 89,792,000
Reclassification from loans held for sale to other real estate owned       (360,000)
Reclassification from loans held for sale to loan receivables (2,534,000)   (2,534,000) (1,779,000)
Sales of loans held for sale (11,906,000) (44,878,000) (71,627,000) (183,036,000)
Principal payoffs and amortization (20,000) (48,000) (40,000) (479,000)
Valuation adjustments   (519,000)   (2,300,000)
Balance at end of period 5,228,000 10,736,000 5,228,000 10,736,000
Real estate loans [Member]
        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Balance at beginning of period 780,000 1,289,000   11,068,000
Origination of loans held for sale         
Reclassification from loans receivable to loans held for sale   8,917,000 780,000 41,141,000
Reclassification from loans held for sale to other real estate owned       (360,000)
Reclassification from loans held for sale to loan receivables (774,000)   (774,000) (1,647,000)
Sales of loans held for sale   (8,828,000)   (47,531,000)
Principal payoffs and amortization (6,000) (21,000) (6,000) (190,000)
Valuation adjustments       (1,124,000)
Balance at end of period   1,357,000   1,357,000
Commercial and Industrial loans [Member]
        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Balance at beginning of period 1,773,000 3,849,000 8,306,000 11,519,000
Origination of loans held for sale 17,135,000 25,722,000 63,113,000 86,311,000
Reclassification from loans receivable to loans held for sale   16,404,000 7,230,000 48,651,000
Reclassification from loans held for sale to loan receivables (1,760,000)   (1,760,000) (132,000)
Sales of loans held for sale (11,906,000) (36,050,000) (71,627,000) (135,505,000)
Principal payoffs and amortization (14,000) (27,000) (34,000) (289,000)
Valuation adjustments   (519,000)   (1,176,000)
Balance at end of period 5,228,000 9,379,000 5,228,000 9,379,000
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 loan receivables         
Sales of loans held for sale          
Principal payoffs and amortization          
Valuation adjustments          
Balance at end of period