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
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Allowance For Loan And Lease Losses [Line Items]      
Beginning Balance $ 63,305   $ 89,936
Actual Charge-Offs (3,024)   (12,321)
Recoveries on Loans Previously Charged Off 714   1,037
Provision Charged to Operating Expense 196   2,400
Ending Balance 61,191   81,052
Allowance for Loan Losses [Member]
     
Allowance For Loan And Lease Losses [Line Items]      
Beginning Balance 63,305 66,107 89,936
Actual Charge-Offs (3,024) (3,966) (12,321)
Recoveries on Loans Previously Charged Off 714 757 1,037
Net Loan Charge-Offs (2,310) (3,209) (11,284)
Provision Charged to Operating Expense 196 407 2,400
Ending Balance 61,191 63,305 81,052
Allowance for Off-Balance Sheet Items [Member]
     
Allowance For Loan And Lease Losses [Line Items]      
Beginning Balance 1,824 2,231 2,981
Provision Charged to Operating Expense (196) (407) (400)
Ending Balance $ 1,628 $ 1,824 $ 2,581