Borrowed Funds - Summary of Other Borrowed Funds (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2015
Line of Credit Facility [Line Items]
FHLB advances, Maturing date	Dec. 19, 2018
FHLB advances	$ 10,000	$ 10,000
Other borrowings	$ 13,752	$ 12,562
FHLB advances, Weighted Average Rate (as a percent)	2.33%	2.33%
Other borrowings, Weighted Average Rate (as a percent)	1.75%	1.90%
Repurchase agreements
Line of Credit Facility [Line Items]
Other borrowings	$ 3,569	$ 2,438
Other borrowings, Weighted Average Rate (as a percent)	0.10%	0.10%
Long term lease obligation
Line of Credit Facility [Line Items]
Other borrowings	$ 183	$ 124
Other borrowings, Weighted Average Rate (as a percent)	2.46%	2.46%