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Loans receivable (Details 7) - USD ($) $ in Thousands | Dec. 31, 2016 | Jun. 30, 2016
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Receivable, Recorded Investment, Total Past Due | $ 10,135 | $ 10,836
Loans Receivable, Recorded Investment, Loans Not Past Due | 239,414 | 234,152
Loans Receivable, Recorded Investment, Total | 249,549 | 244,988
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Receivable, Recorded Investment, Total Past Due | 5,606 | 4,530
Financing Receivables 30 To 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Receivable, Recorded Investment, Total Past Due | 4,529 | 6,306
Residential Real Estate One To Four Family [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Receivable, Recorded Investment, Total Past Due | 9,436 | 10,089
Loans Receivable, Recorded Investment, Loans Not Past Due | 182,229 | 176,036
Loans Receivable, Recorded Investment, Total | 191,665 | 186,125
Residential Real Estate One To Four Family [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Receivable, Recorded Investment, Total Past Due | 5,477 | 4,377
Residential Real Estate One To Four Family [Member] | Financing Receivables 30 To 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Receivable, Recorded Investment, Total Past Due | 3,959 | 5,712
Residential Real Estate Multi Family [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Receivable, Recorded Investment, Total Past Due | 0 | 0
Loans Receivable, Recorded Investment, Loans Not Past Due | 16,033 | 15,559
Loans Receivable, Recorded Investment, Total | 16,033 | 15,559
Residential Real Estate Multi Family [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Receivable, Recorded Investment, Total Past Due | 0 | 0
Residential Real Estate Multi Family [Member] | Financing Receivables 30 To 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Receivable, Recorded Investment, Total Past Due | 0 | 0
Residential Real Estate Construction [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Receivable, Recorded Investment, Total Past Due | 0 | 548
Loans Receivable, Recorded Investment, Loans Not Past Due | 2,378 | 2,261
Loans Receivable, Recorded Investment, Total | 2,378 | 2,809
Residential Real Estate Construction [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Receivable, Recorded Investment, Total Past Due | 0 | 0
Residential Real Estate Construction [Member] | Financing Receivables 30 To 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Receivable, Recorded Investment, Total Past Due | 0 | 548
Land [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Receivable, Recorded Investment, Total Past Due | 0 | 0
Loans Receivable, Recorded Investment, Loans Not Past Due | 1,327 | 1,186
Loans Receivable, Recorded Investment, Total | 1,327 | 1,186
Land [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Receivable, Recorded Investment, Total Past Due | 0 | 0
Land [Member] | Financing Receivables 30 To 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Receivable, Recorded Investment, Total Past Due | 0 | 0
Farm [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Receivable, Recorded Investment, Total Past Due | 548 | 0
Loans Receivable, Recorded Investment, Loans Not Past Due | 1,407 | 1,735
Loans Receivable, Recorded Investment, Total | 1,955 | 1,735
Farm [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Receivable, Recorded Investment, Total Past Due | 0 | 0
Farm [Member] | Financing Receivables 30 To 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Receivable, Recorded Investment, Total Past Due | 548 | 0
Non residential real estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Receivable, Recorded Investment, Total Past Due | 129 | 153
Loans Receivable, Recorded Investment, Loans Not Past Due | 25,153 | 26,985
Loans Receivable, Recorded Investment, Total | 25,282 | 27,138
Non residential real estate [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Receivable, Recorded Investment, Total Past Due | 129 | 153
Non residential real estate [Member] | Financing Receivables 30 To 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Receivable, Recorded Investment, Total Past Due | 0 | 0
Commercial nonmortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Receivable, Recorded Investment, Total Past Due | 0 | 0
Loans Receivable, Recorded Investment, Loans Not Past Due | 2,308 | 1,847
Loans Receivable, Recorded Investment, Total | 2,308 | 1,847
Commercial nonmortgage [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Receivable, Recorded Investment, Total Past Due | 0 | 0
Commercial nonmortgage [Member] | Financing Receivables 30 To 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Receivable, Recorded Investment, Total Past Due | 0 | 0
Loans on deposits [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Receivable, Recorded Investment, Total Past Due | 0 | 0
Loans Receivable, Recorded Investment, Loans Not Past Due | 1,741 | 1,813
Loans Receivable, Recorded Investment, Total | 1,741 | 1,813
Loans on deposits [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Receivable, Recorded Investment, Total Past Due | 0 | 0
Loans on deposits [Member] | Financing Receivables 30 To 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Receivable, Recorded Investment, Total Past Due | 0 | 0
Home equity [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Receivable, Recorded Investment, Total Past Due | 17 | 37
Loans Receivable, Recorded Investment, Loans Not Past Due | 6,425 | 6,118
Loans Receivable, Recorded Investment, Total | 6,442 | 6,155
Home equity [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Receivable, Recorded Investment, Total Past Due | 0 | 0
Home equity [Member] | Financing Receivables 30 To 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Receivable, Recorded Investment, Total Past Due | 17 | 37
Unsecured [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Receivable, Recorded Investment, Total Past Due | 5 | 9
Loans Receivable, Recorded Investment, Loans Not Past Due | 367 | 543
Loans Receivable, Recorded Investment, Total | 372 | 552
Unsecured [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Receivable, Recorded Investment, Total Past Due | 0 | 0
Unsecured [Member] | Financing Receivables 30 To 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Receivable, Recorded Investment, Total Past Due | 5 | 9
Automobile [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Receivable, Recorded Investment, Total Past Due | 0 | 0
Loans Receivable, Recorded Investment, Loans Not Past Due | 46 | 69
Loans Receivable, Recorded Investment, Total | 46 | 69
Automobile [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Receivable, Recorded Investment, Total Past Due | 0 | 0
Automobile [Member] | Financing Receivables 30 To 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Receivable, Recorded Investment, Total Past Due | $ 0 | $ 0

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- Definition Financing receivables that are current. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953401-111524 + Details
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- Definition Recorded Investment in financing receivables that are past due at the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Recorded Investment -URI http://asc.fasb.org/extlink&oid=65880944 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953401-111524 + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65884687&loc=d3e4428-111522 + Details
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