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ALLOWANCE FOR LOAN LOSSES: Credit Quality Indicators (Details 3) - USD ($) $ in Thousands	Sep. 30, 2018	Mar. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	$ 849,842	$ 811,376
Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	829,416	792,298
Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	14,269	11,655
Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	6,157	7,423
Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	0	0
Loss
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	0	0
Commercial and construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	751,540	706,270
Commercial and construction | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	155,487	137,672
Commercial and construction | Commercial business | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	151,080	132,309
Commercial and construction | Commercial business | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	2,141	1,976
Commercial and construction | Commercial business | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	2,266	3,387
Commercial and construction | Commercial business | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	0	0
Commercial and construction | Commercial business | Loss
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	0	0
Commercial and construction | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	462,377	450,597
Commercial and construction | Commercial real estate | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	449,511	440,123
Commercial and construction | Commercial real estate | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	9,976	7,489
Commercial and construction | Commercial real estate | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	2,890	2,985
Commercial and construction | Commercial real estate | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	0	0
Commercial and construction | Commercial real estate | Loss
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	0	0
Commercial and construction | Land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	15,939	15,337
Commercial and construction | Land | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	15,199	14,574
Commercial and construction | Land | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	0	0
Commercial and construction | Land | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	740	763
Commercial and construction | Land | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	0	0
Commercial and construction | Land | Loss
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	0	0
Commercial and construction | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	54,942	63,080
Commercial and construction | Multi-family | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	52,769	60,879
Commercial and construction | Multi-family | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	2,152	2,190
Commercial and construction | Multi-family | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	21	11
Commercial and construction | Multi-family | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	0	0
Commercial and construction | Multi-family | Loss
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	0	0
Commercial and construction | Real estate construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	62,795	39,584
Commercial and construction | Real estate construction | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	62,795	39,584
Commercial and construction | Real estate construction | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	0	0
Commercial and construction | Real estate construction | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	0	0
Commercial and construction | Real estate construction | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	0	0
Commercial and construction | Real estate construction | Loss
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	0	0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	98,302	105,106
Consumer | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	98,062	104,829
Consumer | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	0	0
Consumer | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	240	277
Consumer | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	0	0
Consumer | Loss
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	$ 0	$ 0

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

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