Premises and Equipment - Summary of Premises and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 49,211	$ 59,584
Less: accumulated depreciation and amortization	(34,108)	(35,589)
Premises and equipment, net	15,103	23,996
Land [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	1,085	2,589
Buildings [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	15,175	23,550
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	10,571	11,774
Furniture, Fixtures and Equipment [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	21,562	20,872
Automobiles [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 818	$ 800