Credit Quality - Schedule of Nonaccrual Loans, Segregated by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Non Accrual Loans Segregated By Class Of Loans [Line Items]
Loans on Nonaccrual Status	$ 62,789	$ 71,934
Owner-Occupied [Member]
Non Accrual Loans Segregated By Class Of Loans [Line Items]
Loans on Nonaccrual Status	3,154	12,653
Nonowner-Occupied [Member]
Non Accrual Loans Segregated By Class Of Loans [Line Items]
Loans on Nonaccrual Status	11,539	9,094
Other Commercial [Member]
Non Accrual Loans Segregated By Class Of Loans [Line Items]
Loans on Nonaccrual Status	10,898	19,121
Residential Real Estate [Member]
Non Accrual Loans Segregated By Class Of Loans [Line Items]
Loans on Nonaccrual Status	20,232	14,732
Construction & Land Development [Member]
Non Accrual Loans Segregated By Class Of Loans [Line Items]
Loans on Nonaccrual Status	16,880	16,264
Bankcard [Member]
Non Accrual Loans Segregated By Class Of Loans [Line Items]
Loans on Nonaccrual Status	0	0
Other Consumer [Member]
Non Accrual Loans Segregated By Class Of Loans [Line Items]
Loans on Nonaccrual Status	$ 86	$ 70