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LOANS RECEIVABLE: Loans receivable, excluding loans held for sale (Details) - USD ($) $ in Thousands	Jun. 30, 2018		Mar. 31, 2018	Jun. 30, 2017	Mar. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 826,586		$ 811,376
Less: Allowance for loan losses	11,349		10,766	$ 10,597	$ 10,528
Loans receivable, net	815,237		800,610
Commercial and construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	725,530		706,270
Commercial and construction | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	148,257		137,672
Less: Allowance for loan losses	1,799		1,668	1,391	1,418
Commercial and construction | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	448,019		450,597
Less: Allowance for loan losses	5,139		4,914	5,176	5,084
Commercial and construction | Land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	17,304		15,337
Less: Allowance for loan losses	258		220	219	228
Commercial and construction | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	58,794		63,080
Less: Allowance for loan losses	781		822	502	297
Commercial and construction | Real estate construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	53,156		39,584
Less: Allowance for loan losses	855		618	668	714
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	101,056		105,106
Less: Allowance for loan losses	1,788		1,809	$ 1,932	$ 2,099
Consumer | Real estate one-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	88,212		90,109
Consumer | Other installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 12,844	[1]	$ 14,997
[1] Consists primarily of purchased automobile loans totaling $10.8 million and $12.9 million at June 30, 2018 and March 31, 2018, 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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