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ALLOWANCE FOR LOAN LOSSES: Impaired Loans, Average Recorded Investment and Interest Recognized (Details 6) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Average Recorded Investment | $ 9,016 | $ 13,118 | $ 18,262
Interest Recognized on Impaired Loans | 294 | 502 | 644
Commercial and construction | Commercial business |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Average Recorded Investment | 930 | 255 | 542
Interest Recognized on Impaired Loans | 41 | 10 | 17
Commercial and construction | Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Average Recorded Investment | 4,185 | 8,823 | 13,130
Interest Recognized on Impaired Loans | 101 | 337 | 456
Commercial and construction | Land |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Average Recorded Investment | 781 | 801 | 801
Interest Recognized on Impaired Loans | 0 | 0 | 0
Commercial and construction | Multi-family |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Average Recorded Investment | 1,668 | 1,710 | 1,842
Interest Recognized on Impaired Loans | 90 | 93 | 99
Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Average Recorded Investment | 1,452 | 1,529 | 1,947
Interest Recognized on Impaired Loans | $ 62 | $ 62 | $ 72

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