Premises and Equipment - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013 Option Y Office Bank	Dec. 31, 2012	Dec. 31, 2011
Property Plant And Equipment Useful Life And Values [Abstract]
Estimated cost of construction projects in progress	$ 1,000,000	$ 1,000,000
Depreciation expense	4,800,000	5,300,000	4,500,000
Lease initial term	10
Number of renewal option	2
Number of bank offices	12
Number of mortgage offices	8
Rental expenses	$ 1,777,000	$ 1,708,000	$ 1,697,000