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 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]        
Balance at beginning of period $ 51,886 $ 59,876 $ 57,555 $ 63,305
Charge-offs (1,418) (4,610) (5,569) (11,124)
Recoveries on loans previously charged off 663 2,383 6,656 4,964
(Negative provision) provision charged to operating expense (48) 10 7,463 (494)
Balance at end of period 51,179 57,639 51,179 57,639
Allowance for loan losses [Member]
       
Financing Receivable, Allowance for Credit Losses [Line Items]        
Balance at beginning of period 51,886 59,876 57,555 63,305
Charge-offs (1,418) (4,610) (5,569) (11,124)
Recoveries on loans previously charged off 663 2,383 6,656 4,964
Net loan (charge-offs) recoveries (755) (2,227) 1,087 (6,160)
(Negative provision) provision charged to operating expense 48 (10) (7,463) 494
Balance at end of period 51,179 57,639 51,179 57,639
Allowance for off-balance sheet items [Member]
       
Financing Receivable, Allowance for Credit Losses [Line Items]        
Balance at beginning of period 1,592 1,320 1,247 1,824
(Negative provision) provision charged to operating expense (48) 10 297 (494)
Balance at end of period $ 1,544 $ 1,330 $ 1,544 $ 1,330