Consideration Paid and Fair Value of Identifiable Assets Acquired and Liabilities Assumed, First Bank of Delaware (Detail) (USD $) In Thousands, unless otherwise specified			1 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Nov. 17, 2012 First Bank Of Delaware
Business Acquisition [Line Items]
Cash			$ 10,559
Value of consideration			10,559
Cash and due from banks			525
Loans			76,556
Premises and equipment			460
Core deposit intangible			320
Other assets			256
Total assets			78,117
Nonmaturity deposits			27,080
Time deposits			43,257
Unfavorable lease			140
Other liabilities			390
Total liabilities			70,867
Net assets acquired			7,250
Goodwill resulting from the FBD Transaction	$ 32,843	$ 32,897	$ 3,309