Borrowed Funds (Detail) - Narrative - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
FHLB advances	$ 9,900	$ 0
Floating interest rate	0.40%
Repayments of debt		114,600
Net losses on early extinguishment of debt	$ 0	2,059	$ 1,034
Notes Payable to Banks
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity	$ 0	35,000
Federal Home Loan Bank Advances
Debt Instrument [Line Items]
Net losses on early extinguishment of debt		$ 2,100