Quarterly report pursuant to Section 13 or 15(d)

Loans - Allowance for Loan Losses and Allowance for Off-Balance Sheet Items (Detail)

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Loans - Allowance for Loan Losses and Allowance for Off-Balance Sheet Items (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]        
Balance at beginning of period $ 56,593 $ 61,191 $ 57,555 $ 63,305
Charge-offs (2,547) (3,490) (4,151) (6,514)
Recoveries on loans previously charged off 1,741 1,867 5,992 2,581
(Negative provision) provision charged to operating expense 3,901 (308) 7,510 (504)
Balance at end of period 51,886 59,876 51,886 59,876
Allowance for loan losses [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Balance at beginning of period 56,593 61,191 57,555 63,305
Charge-offs (2,547) (3,490) (4,151) (6,514)
Recoveries on loans previously charged off 1,741 1,867 5,992 2,581
Net loan (charge-offs) recoveries (806) (1,623) 1,841 (3,933)
(Negative provision) provision charged to operating expense (3,901) 308 (7,510) 504
Balance at end of period 51,886 59,876 51,886 59,876
Allowance for off-balance sheet items [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Balance at beginning of period 1,557 1,628 1,248 1,822
(Negative provision) provision charged to operating expense 35 (308) 344 (502)
Balance at end of period $ 1,592 $ 1,320 $ 1,592 $ 1,320