Components of Premises and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Land	$ 9,954	$ 9,954
Buildings and leasehold improvements	60,939	61,456
Equipment	39,756	38,510
Total premises and equipment	110,649	109,920
Less: accumulated depreciation and amortization	(64,733)	(61,594)
Net premises and equipment	$ 45,916	$ 48,326