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LOANS RECEIVABLE: Loans receivable, excluding loans held for sale (Details) - USD ($) $ in Thousands		Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		$ 887,977	$ 876,116
Less: Allowance for loan losses		11,442	11,457	$ 11,349	$ 10,766
Loans receivable, net		876,535	864,659
Commercial and construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		797,525	783,707
Commercial and construction | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		164,400	162,796
Less: Allowance for loan losses		2,113	1,808	1,799	1,668
Commercial and construction | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		472,373	461,432
Less: Allowance for loan losses		4,889	5,053	5,139	4,914
Commercial and construction | Land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		16,362	17,027
Less: Allowance for loan losses		244	254	258	220
Commercial and construction | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		50,674	51,570
Less: Allowance for loan losses		699	728	781	822
Commercial and construction | Real estate construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		93,716	90,882
Less: Allowance for loan losses		1,506	1,457	855	618
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		90,452	92,409
Less: Allowance for loan losses		1,346	1,447	$ 1,788	$ 1,809
Consumer | Real estate one-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		83,256	84,053
Consumer | Other installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	[1]	$ 7,196	$ 8,356
[1] Consists primarily of purchased automobile loans totaling $4.5 million and $5.8 million at June 30, 2019 and March 31, 2019, respectively.

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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.

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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.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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