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LOANS RECEIVABLE: Loans receivable, excluding loans held for sale (Details) - USD ($) $ in Thousands		Dec. 31, 2018	Sep. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Mar. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		$ 868,636		$ 811,376
Less: Allowance for loan losses		11,502	$ 11,513	10,766	$ 10,867	$ 10,617	$ 10,528
Loans receivable, net		857,134		800,610
Commercial and construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		772,675		706,270
Commercial and construction | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		154,360		137,672
Less: Allowance for loan losses		1,942	1,858	1,668	1,374	1,340	1,418
Commercial and construction | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		468,361		450,597
Less: Allowance for loan losses		5,281	5,361	4,914	5,155	5,116	5,084
Commercial and construction | Land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		18,506		15,337
Less: Allowance for loan losses		268	237	220	177	196	228
Commercial and construction | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		54,930		63,080
Less: Allowance for loan losses		715	696	822	799	504	297
Commercial and construction | Real estate construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		76,518		39,584
Less: Allowance for loan losses		1,193	1,007	618	634	840	714
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		95,961		105,106
Less: Allowance for loan losses		1,453	$ 1,641	1,809	$ 1,936	$ 1,890	$ 2,099
Consumer | Real estate one-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		86,240		90,109
Consumer | Other installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	[1]	$ 9,721		$ 14,997
[1] Consists primarily of purchased automobile loans totaling $7.2 million and $12.9 million at December 31, 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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