Long-Term Borrowings and Subordinated Debt - Schedule of Junior Subordinated Debt Securities and Interest Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Junior Subordinated Debentures [Line Items]
Balance	$ 45,619	$ 45,619	$ 45,619
Interest Expense	1,327	1,222	2,070
2006 Junior Subordinated Debt
Junior Subordinated Debentures [Line Items]
Balance	25,000	25,000	25,000
Interest Expense	554	463	475
2008 Junior Subordinated Debt-Trust Preferred Securities
Junior Subordinated Debentures [Line Items]
Balance	20,619	20,619	20,619
Interest Expense	773	759	770
2008 Junior Subordinated Debt
Junior Subordinated Debentures [Line Items]
Balance	0	0	0
Interest Expense	0	0	422
2008 Junior Subordinated Debt
Junior Subordinated Debentures [Line Items]
Balance	0	0	0
Interest Expense	$ 0	$ 0	$ 403