Loans - Summary of Loans Past Due More than 90 Days and Still Accruing Interest (Detail) - USD ($)	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans past due more than 90 days and still accruing interest	$ 2,679,000	$ 0	$ 0
One-to-Four Family Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans past due more than 90 days and still accruing interest	283,000
Non-Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans past due more than 90 days and still accruing interest	1,160,000
Land [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans past due more than 90 days and still accruing interest	$ 1,236,000