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ALLOWANCE FOR LOAN LOSSES: Credit Quality Indicators (Details 3) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	$ 887,977	$ 876,116
Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	875,257	864,483
Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	6,686	5,327
Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	6,034	6,306
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	797,525	783,707
Commercial and construction | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	164,400	162,796
Commercial and construction | Commercial business | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	159,101	159,997
Commercial and construction | Commercial business | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	3,453	840
Commercial and construction | Commercial business | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	1,846	1,959
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	472,373	461,432
Commercial and construction | Commercial real estate | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	466,308	454,013
Commercial and construction | Commercial real estate | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	2,729	4,030
Commercial and construction | Commercial real estate | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	3,336	3,389
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	16,362	17,027
Commercial and construction | Land | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	15,638	16,299
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	724	728
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	50,674	51,570
Commercial and construction | Multi-family | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	50,150	51,093
Commercial and construction | Multi-family | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	504	457
Commercial and construction | Multi-family | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	20	20
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	93,716	90,882
Commercial and construction | Real estate construction | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	93,716	90,882
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	90,452	92,409
Consumer | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	90,344	92,199
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	108	210
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
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