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LOANS RECEIVABLE: Loans receivable, excluding loans held for sale (Details) - USD ($) $ in Thousands		Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		$ 849,842		$ 811,376
Less: Allowance for loan losses		11,513	$ 11,349	10,766	$ 10,617	$ 10,597	$ 10,528
Loans receivable, net		838,329		800,610
Commercial and construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		751,540		706,270
Commercial and construction | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		155,487		137,672
Less: Allowance for loan losses		1,858	1,799	1,668	1,340	1,391	1,418
Commercial and construction | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		462,377		450,597
Less: Allowance for loan losses		5,361	5,139	4,914	5,116	5,176	5,084
Commercial and construction | Land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		15,939		15,337
Less: Allowance for loan losses		237	258	220	196	219	228
Commercial and construction | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		54,942		63,080
Less: Allowance for loan losses		696	781	822	504	502	297
Commercial and construction | Real estate construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		62,795		39,584
Less: Allowance for loan losses		1,007	855	618	840	668	714
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		98,302		105,106
Less: Allowance for loan losses		1,641	$ 1,788	1,809	$ 1,890	$ 1,932	$ 2,099
Consumer | Real estate one-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		86,950		90,109
Consumer | Other installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	[1]	$ 11,352		$ 14,997
[1] Consists primarily of purchased automobile loans totaling $8.9 million and $12.9 million at September 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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