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Allowance for Loan Losses: Impaired Financing Receivables (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Mar. 31, 2016
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	$ 12,552	$ 13,003
Impaired Financing Receivable, with Related Allowance, Recorded Investment	1,185	1,201
Impaired Financing Receivable, Recorded Investment	13,737	14,204
Impaired Financing Receivable, Unpaid Principal Balance	15,083	15,473
Impaired Financing Receivable, Related Allowance	102	110
Commercial business
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	300	192
Impaired Financing Receivable, Recorded Investment	300	192
Impaired Financing Receivable, Unpaid Principal Balance	301	192
Commercial Real Estate
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	9,431	9,802
Impaired Financing Receivable, Recorded Investment	9,431	9,802
Impaired Financing Receivable, Unpaid Principal Balance	10,498	10,758
Land
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	801	801
Impaired Financing Receivable, Recorded Investment	801	801
Impaired Financing Receivable, Unpaid Principal Balance	807	807
Multi-Family
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1,709	1,731
Impaired Financing Receivable, Recorded Investment	1,709	1,731
Impaired Financing Receivable, Unpaid Principal Balance	1,847	1,871
Consumer Member
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	311	477
Impaired Financing Receivable, with Related Allowance, Recorded Investment	1,185	1,201
Impaired Financing Receivable, Recorded Investment	1,496	1,678
Impaired Financing Receivable, Unpaid Principal Balance	1,630	1,845
Impaired Financing Receivable, Related Allowance	$ 102	$ 110

X

- Definition

Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953550-111524

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X

- Definition

Amount of allowance for credit losses related to recorded investment.

+ 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 15
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

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- Definition

Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

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- Definition

Amount of investment in impaired financing receivables for which there is no related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953550-111524

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X

- Definition

Amount of investment in impaired financing receivables for which there is a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953550-111524

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