Loans and Allowance for Loan Losses Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Deferred loan fee income	$ 89,000,000		$ 77,000,000
Loans modified in TDRs	22,433,000		34,328,000
Unfunded commitments available for funding	100,000
Loans modified in TDRs during the period	13,848,000	[1]	28,723,000	[1]	13,599,000	[1]
Forgiveness Of Principal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in TDRs during the period			9,000,000
Payment Deferrals Granted
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in TDRs during the period			$ 19,000,000

[1] During 2013 , 2012, and 2011 we had partial charge-offs of $11.1 million, $14.3 million, and $2.8 million respectively, on loans classified as TDRs.