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Investment Securities Investment Securities: Investments with Unrealized Loss Positions (Details) - USD ($)		3 Months Ended		9 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Jun. 30, 2017
Principal payments from investment securities available for sale		$ 7,613,000	$ 3,536,000	$ 19,335,000	$ 10,832,000
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value						$ 83,709,000	$ 28,722,000
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss		893,000		893,000			77,000
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		893,000		893,000			77,000
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		0		0			0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value						$ 0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		83,709,000		83,709,000			28,722,000
U.S. government sponsored enterprise MBS
Proceeds from Sale of Available-for-sale Securities, Debt		0		0
Payments to Acquire Mortgage Backed Securities (MBS) categorized as Held-to-maturity		12,600,000	$ 11,000,000	51,100,000	$ 11,000,000
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		80,725,000		80,725,000			28,722,000
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value		80,725,000		80,725,000			28,722,000
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	[1]	875,000		875,000			77,000
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		875,000		875,000			77,000
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		0		0			0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		$ 0		$ 0			$ 0
[1] Mortgage-Backed Securities (“MBS”).

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- Definition

This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

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This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity that have been in a continuous loss position for twelve months or longer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity in a continuous loss position.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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This item represents the fair value of securities categorized as held-to-maturity which are in an unrealized loss position.

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-Publisher FASB
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Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity that have been in a continuous loss position for less than twelve months.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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The cash outflow for the purchase of securities issued by a governmental agency or corporation (for example, GNMA or FHLMC) or by private issuers (for example, banks and mortgage banking enterprises) secured by and repaid from underlying mortgages, which were designated as held to maturity when acquired.

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The cash inflow from the maturity (principal due), prepayment and call (request of early payment) of a loan financed by home mortgage payments classified as held to maturity.

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The cash inflow associated with the sale of debt securities classified as available-for-sale securities.

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