Premises and Equipment - Schedule of Premises and Equipment (Detail) (USD $) In Thousands, unless otherwise specified							12 Months Ended				12 Months Ended				12 Months Ended				12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Land [Member]	Dec. 31, 2012 Land [Member]	Dec. 31, 2013 Buildings and improvements [Member]	Dec. 31, 2012 Buildings and improvements [Member]	Dec. 31, 2013 Buildings and improvements [Member] Minimum [Member]	Dec. 31, 2013 Buildings and improvements [Member] Maximum [Member]	Dec. 31, 2013 Leasehold improvements [Member]	Dec. 31, 2012 Leasehold improvements [Member]	Dec. 31, 2013 Leasehold improvements [Member] Minimum [Member]	Dec. 31, 2013 Leasehold improvements [Member] Maximum [Member]	Dec. 31, 2013 Furniture and equipment [Member]	Dec. 31, 2012 Furniture and equipment [Member]	Dec. 31, 2013 Furniture and equipment [Member] Minimum [Member]	Dec. 31, 2013 Furniture and equipment [Member] Maximum [Member]	Dec. 31, 2013 Software [Member]	Dec. 31, 2012 Software [Member]	Dec. 31, 2013 Software [Member] Minimum [Member]	Dec. 31, 2013 Software [Member] Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life							10 years	50 years			5 years	40 years			3 years	10 years			3 years	10 years
Property plant and equipment, gross	$ 234,878	$ 227,828	$ 12,431	$ 12,503	$ 81,829	$ 81,328			$ 14,354	$ 14,617			$ 80,131	$ 79,181			$ 46,133	$ 40,199
Less accumulated depreciation and amortization	166,938	158,858
Total premises and equipment	$ 67,940	$ 68,970