Derivative Instruments and Hedging Activities - Amount of Gain or Loss Recognized in Income on Derivatives (Detail) (Not Designated as Hedging Instruments [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivative (Loss) Gain	$ (474)	$ 371	$ (518)
Interest Rate Swap Contracts-Commercial Loans [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivative (Loss) Gain	(174)	101	(38)
Interest Rate Lock Commitments-Mortgage Loans [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivative (Loss) Gain	(382)	223	27
Forward Sale Contracts-Mortgage Loans [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivative (Loss) Gain	$ 82	$ 47	$ (507)