Schedule II - Condensed Financial Information of Registrant (Balance Sheet II) (Details) - $ / shares	Dec. 31, 2017	Dec. 31, 2016
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	10,000,000	0
Common stock, shares issued (in shares)	3,500,000	0
Common stock, shares outstanding (in shares)	3,171,878	0
Unearned ESOP shares (in shares)	328,122	0
Parent Company [Member]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	10,000,000	0
Common stock, shares issued (in shares)	3,500,000	0
Common stock, shares outstanding (in shares)	3,171,878	0
Unearned ESOP shares (in shares)	328,122	0