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Loans receivable (Details 2) - USD ($) $ in Thousands | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015
--- | --- | --- | --- | --- | --- | ---
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans individually evaluated for impairment, Individually evaluated |  |  | $ 3,400 |  |  |
Loans individually evaluated for impairment, Acquired with deteriorated credit quality |  |  | 2,310 |  |  |
Loans individually evaluated for impairment, Total allowance |  |  | 0 |  |  |
Loans collectively evaluated for impairment, Ending loans balance | $ 1,473 |  | 1,515 |  |  |
Allowance for loan losses | 1,473 | $ 1,476 | 1,515 | $ 1,568 | $ 1,568 | $ 1,568
Ending allowance attributed to loans [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans individually evaluated for impairment, Ending loans balance |  |  | 0 |  |  |
Loans collectively evaluated for impairment, Ending loans balance | 1,273 |  | 1,315 |  |  |
Allowance for loan losses | 1,273 |  | 1,315 |  |  |
Ending loans balance [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans individually evaluated for impairment, Ending loans balance |  |  | 5,710 |  |  |
Loans collectively evaluated for impairment, Ending loans balance | 243,790 |  | 239,278 |  |  |
Allowance for loan losses | 249,549 |  | 244,988 |  |  |
Unallocated Allowance [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans individually evaluated for impairment, Total allowance |  |  | 0 |  |  |
Loans collectively evaluated for impairment, Ending loans balance | 200 |  | 200 |  |  |
Allowance for loan losses | 200 |  | 200 |  |  |
Residential Real Estate One To Four Family [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans individually evaluated for impairment, Individually evaluated | 3,941 |  | 3,400 |  |  |
Loans individually evaluated for impairment, Acquired with deteriorated credit quality | 1,818 |  | 2,146 |  |  |
Loans individually evaluated for impairment, Ending loans balance | 0 |  |  | 0 |  |
Loans individually evaluated for impairment, Total allowance | 0 |  | 0 |  |  |
Loans collectively evaluated for impairment, Total allowance | 801 |  | 862 |  |  |
Allowance for loan losses | 801 | 803 | 862 | 1,045 | 1,060 | 1,059
Residential Real Estate One To Four Family [Member] | Ending allowance attributed to loans [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans individually evaluated for impairment, Ending loans balance | 0 |  | 0 |  |  |
Loans collectively evaluated for impairment, Ending loans balance | 801 |  | 862 |  |  |
Residential Real Estate One To Four Family [Member] | Ending loans balance [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans individually evaluated for impairment, Ending loans balance | 5,759 |  | 5,546 |  |  |
Loans collectively evaluated for impairment, Ending loans balance | 185,906 |  | 180,579 |  |  |
Residential Real Estate One To Four Family [Member] | Unallocated Allowance [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans individually evaluated for impairment, Total allowance | 0 |  | 0 |  |  |
Loans collectively evaluated for impairment, Total allowance | 0 |  | 0 |  |  |
Residential Real Estate Multi Family [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans collectively evaluated for impairment, Total allowance | 211 |  | 192 |  |  |
Allowance for loan losses | 211 | 208 | 192 | 96 | 97 | 94
Residential Real Estate Multi Family [Member] | Ending allowance attributed to loans [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans collectively evaluated for impairment, Ending loans balance | 211 |  | 192 |  |  |
Residential Real Estate Multi Family [Member] | Ending loans balance [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans collectively evaluated for impairment, Ending loans balance | 16,033 |  | 15,559 |  |  |
Residential Real Estate Multi Family [Member] | Unallocated Allowance [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans collectively evaluated for impairment, Total allowance | 0 |  | 0 |  |  |
Residential Real Estate Construction [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans collectively evaluated for impairment, Total allowance | 4 |  | 5 |  |  |
Allowance for loan losses | 4 | 5 | 5 | 14 | 16 | 21
Residential Real Estate Construction [Member] | Ending allowance attributed to loans [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans collectively evaluated for impairment, Ending loans balance | 4 |  | 5 |  |  |
Residential Real Estate Construction [Member] | Ending loans balance [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans collectively evaluated for impairment, Ending loans balance | 2,378 |  | 2,809 |  |  |
Residential Real Estate Construction [Member] | Unallocated Allowance [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans collectively evaluated for impairment, Total allowance | 0 |  | 0 |  |  |
Land [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans collectively evaluated for impairment, Total allowance | 3 |  | 2 |  |  |
Allowance for loan losses | 3 | 2 | 2 | 8 | 8 | 7
Land [Member] | Ending allowance attributed to loans [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans collectively evaluated for impairment, Ending loans balance | 3 |  | 2 |  |  |
Land [Member] | Ending loans balance [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans collectively evaluated for impairment, Ending loans balance | 1,327 |  | 1,186 |  |  |
Land [Member] | Unallocated Allowance [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans collectively evaluated for impairment, Total allowance | 0 |  | 0 |  |  |
Farm [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans collectively evaluated for impairment, Total allowance | 4 |  | 3 |  |  |
Allowance for loan losses | 4 | 4 | 3 | 9 | 9 | 9
Farm [Member] | Ending allowance attributed to loans [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans collectively evaluated for impairment, Ending loans balance | 4 |  | 3 |  |  |
Farm [Member] | Ending loans balance [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans collectively evaluated for impairment, Ending loans balance | 1,955 |  | 1,735 |  |  |
Farm [Member] | Unallocated Allowance [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans collectively evaluated for impairment, Total allowance | 0 |  | 0 |  |  |
Non residential real estate [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans individually evaluated for impairment, Individually evaluated |  |  | 0 |  |  |
Loans individually evaluated for impairment, Acquired with deteriorated credit quality |  |  | 164 |  |  |
Loans individually evaluated for impairment, Total allowance |  |  | 0 |  |  |
Loans collectively evaluated for impairment, Ending loans balance | 230 |  |  |  |  |
Loans collectively evaluated for impairment, Total allowance |  |  | 217 |  |  |
Non residential real estate [Member] | Ending allowance attributed to loans [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans individually evaluated for impairment, Ending loans balance |  |  | 0 |  |  |
Loans collectively evaluated for impairment, Ending loans balance | 230 |  | 217 |  |  |
Non residential real estate [Member] | Ending loans balance [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans individually evaluated for impairment, Ending loans balance |  |  | 164 |  |  |
Loans collectively evaluated for impairment, Ending loans balance | 25,282 |  | 26,974 |  |  |
Non residential real estate [Member] | Unallocated Allowance [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans individually evaluated for impairment, Total allowance |  |  | 0 |  |  |
Loans collectively evaluated for impairment, Ending loans balance | 0 |  |  |  |  |
Loans collectively evaluated for impairment, Total allowance |  |  | 0 |  |  |
Commercial Non-mortgage [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans collectively evaluated for impairment, Total allowance | 4 |  | 18 |  |  |
Commercial Non-mortgage [Member] | Ending allowance attributed to loans [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans collectively evaluated for impairment, Ending loans balance | 4 |  | 18 |  |  |
Commercial Non-mortgage [Member] | Ending loans balance [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans collectively evaluated for impairment, Ending loans balance | 2,308 |  | 1,847 |  |  |
Commercial Non-mortgage [Member] | Unallocated Allowance [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans collectively evaluated for impairment, Total allowance | 0 |  | 0 |  |  |
Loans on deposits [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans collectively evaluated for impairment, Total allowance | 3 |  | 4 |  |  |
Allowance for loan losses | 3 | 4 | 4 | 11 | 13 | 13
Loans on deposits [Member] | Ending allowance attributed to loans [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans collectively evaluated for impairment, Ending loans balance | 3 |  | 4 |  |  |
Loans on deposits [Member] | Ending loans balance [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans collectively evaluated for impairment, Ending loans balance | 1,741 |  | 1,813 |  |  |
Loans on deposits [Member] | Unallocated Allowance [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans collectively evaluated for impairment, Total allowance | 0 |  | 0 |  |  |
Home equity [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans collectively evaluated for impairment, Total allowance | 12 |  | 11 |  |  |
Allowance for loan losses | 12 | 12 | 11 | 30 | 31 | 31
Home equity [Member] | Ending allowance attributed to loans [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans collectively evaluated for impairment, Ending loans balance | 12 |  | 11 |  |  |
Home equity [Member] | Ending loans balance [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans collectively evaluated for impairment, Ending loans balance | 6,442 |  | 6,155 |  |  |
Home equity [Member] | Unallocated Allowance [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans collectively evaluated for impairment, Total allowance | 0 |  | 0 |  |  |
Unsecured [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans collectively evaluated for impairment, Total allowance | 1 |  | 1 |  |  |
Allowance for loan losses | 1 | 1 | 1 | 2 | 2 | 3
Unsecured [Member] | Ending allowance attributed to loans [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans collectively evaluated for impairment, Ending loans balance | 1 |  | 1 |  |  |
Unsecured [Member] | Ending loans balance [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans collectively evaluated for impairment, Ending loans balance | 372 |  | 552 |  |  |
Unsecured [Member] | Unallocated Allowance [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans collectively evaluated for impairment, Total allowance | 0 |  | 0 |  |  |
Unallocated [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans collectively evaluated for impairment, Total allowance | 200 |  | 200 |  |  |
Allowance for loan losses | 200 | 200 | 200 | 200 | 200 | 200
Unallocated [Member] | Ending allowance attributed to loans [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans collectively evaluated for impairment, Ending loans balance | 0 |  | 0 |  |  |
Unallocated [Member] | Ending loans balance [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans collectively evaluated for impairment, Ending loans balance | 0 |  | 0 |  |  |
Unallocated [Member] | Unallocated Allowance [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans collectively evaluated for impairment, Total allowance | 200 |  | 200 |  |  |
Automobile [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans collectively evaluated for impairment, Total allowance | 0 |  | 0 |  |  |
Allowance for loan losses | 0 | $ 0 | 0 | $ 0 | $ 0 | $ 0
Automobile [Member] | Ending allowance attributed to loans [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans collectively evaluated for impairment, Ending loans balance | 0 |  | 0 |  |  |
Automobile [Member] | Ending loans balance [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans collectively evaluated for impairment, Ending loans balance | 46 |  | 69 |  |  |
Automobile [Member] | Unallocated Allowance [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans collectively evaluated for impairment, Total allowance | $ 0 |  | $ 0 |  |  |

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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for 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 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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