Securities (Details) - USD ($)	9 Months Ended
Mar. 31, 2017	Mar. 31, 2016	Jun. 30, 2016
Amortized cost and estimated fair value of investments in debt and equity securities
Investment securities available-for-sale, amortized cost	$ 1,461,337
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(27,621)
Securities available-for-sale	1,433,716		$ 664,755
Investment securities held-to-maturity, amortized cost	744,640		781,740
Investment securities held-to-maturity , gross unrealized gains	11,208		19,374
Investment securities held-to-maturity , gross unrealized losses	(155)
Investment securities held-to-maturity, estimated fair value	755,693		801,114
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	475,031		658,579
Investment securities available-for-sale , gross unrealized gain			6,176
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(347)
Securities available-for-sale	474,684		664,755
Investment securities held-to-maturity, amortized cost	144,501		180,035
Investment securities held-to-maturity , gross unrealized gains	11,208		15,281
Investment securities held-to-maturity, estimated fair value	155,709		195,316
Municipal securities
Amortized cost and estimated fair value of investments in debt and equity securities
Investment securities held-to-maturity, amortized cost	600,139		601,705
Investment securities held-to-maturity , gross unrealized gains			4,093
Investment securities held-to-maturity , gross unrealized losses	(155)
Investment securities held-to-maturity, estimated fair value	599,984		$ 605,798
Available-for-sale Securities, Debt Maturities, Single Maturity Date [Abstract]
Held-to-maturity securities maturing in the year ending June 30, 2020	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	986,306
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(27,274)
Securities available-for-sale	959,032
Available-for-sale Securities, Debt Maturities, Single Maturity Date [Abstract]
Bonds maturing in the year ending June 30, 2023	$ 985,000

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Fair value of available-for-sale debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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The aggregate value of securities held, which were categorized neither as trading nor held-to-maturity, for which the interest rate reset through an auction process, that failed to be liquidated through auction, and which were sold at par value during the period.

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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Fair value of held-to-maturity debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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