Deposits - Summary of Deposit Balances by Type (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deposits [Abstract]
Demand deposits	$ 59,646	$ 43,478
NOW accounts	49,112	41,109
Money market deposits	50,956	46,527
Regular and other savings	101,575	94,690
Total non-certificate accounts	261,289	225,804
Term certificates less than $250,000	83,410	75,853
Term certificates of $250,000 or more	6,480	7,538
Total certificate accounts	89,890	83,391
Total deposits	$ 351,179	$ 309,195