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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
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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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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 + Details
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