Securities (Details) - USD ($)	6 Months Ended
Securities (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016	Jun. 30, 2017
Amortized cost and estimated fair value of investments in debt and equity securities
Investment securities available-for-sale, amortized cost	$ 1,365,138		$ 1,426,989
Investment securities available-for-sale , gross unrealized gains	1,085		1,973
Investment securities available-for-sale , gross unrealized losses	(21,856)		(18,007)
Securities available-for-sale	1,344,367		1,410,955
Investment securities held-to-maturity, amortized cost	718,955		735,978
Investment securities held-to-maturity , gross unrealized gains	7,228		10,279
Investment securities held-to-maturity , gross unrealized losses	(2,564)		(384)
Investment securities held-to-maturity, estimated fair value	723,619		745,873
Available-for-sale Securities, Debt Maturities, Single Maturity Date [Abstract]
Securities sold	0	$ 0
Residential mortgage-backed securities
Amortized cost and estimated fair value of investments in debt and equity securities
Investment securities available-for-sale, amortized cost	376,992		440,070
Investment securities available-for-sale , gross unrealized gains	1,085		1,973
Investment securities available-for-sale , gross unrealized losses	(1,604)		(33)
Securities available-for-sale	376,473		442,010
Investment securities held-to-maturity, amortized cost	118,955		135,978
Investment securities held-to-maturity , gross unrealized gains	7,228		10,279
Investment securities held-to-maturity, estimated fair value	126,183		146,257
Municipal securities
Amortized cost and estimated fair value of investments in debt and equity securities
Investment securities held-to-maturity, amortized cost	600,000		600,000
Investment securities held-to-maturity , gross unrealized losses	(2,564)		(384)
Investment securities held-to-maturity, estimated fair value	597,436		599,616
Available-for-sale Securities, Debt Maturities, Single Maturity Date [Abstract]
Held-to-maturity securities maturing June 30, 2019	400,000
U.S. Government-sponsored agencies securities
Amortized cost and estimated fair value of investments in debt and equity securities
Investment securities available-for-sale, amortized cost	988,146		986,919
Investment securities available-for-sale , gross unrealized losses	(20,252)		(17,974)
Securities available-for-sale	967,894		$ 968,945
Available-for-sale Securities, Debt Maturities, Single Maturity Date [Abstract]
Securities maturing in the year ending June 30, 2023	$ 981,000

Equitable Financial Corp. 10-Q