Premises And Equipment - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Operating Leases, Rent Expense, Net	$ 7.4	$ 6.6	$ 5.9
Maximum
Property, Plant and Equipment [Line Items]
Lease Commitment Initial Term	15 years
Minimum
Property, Plant and Equipment [Line Items]
Lease Commitment Initial Term	3 years
Ground Lease | Maximum
Property, Plant and Equipment [Line Items]
Lease Commitment Initial Term	20 years
Premises and Equipment
Property, Plant and Equipment [Line Items]
Depreciation and amortization	$ 4.6	$ 4.5	$ 4.3