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ALLOWANCE FOR LOAN LOSSES: Schedule of TDRs by Interest Accrual Status (Details 6) - USD ($) $ in Thousands	Dec. 31, 2017	Mar. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrual	$ 5,627	$ 9,429
Nonaccrual	2,350	2,437
Total	7,977	11,866
Commercial Business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrual	831	0
Nonaccrual	289	294
Total	1,120	294
Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrual	1,699	6,262
Nonaccrual	1,291	1,342
Total	2,990	7,604
Land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrual	0	0
Nonaccrual	770	801
Total	770	801
Multi-Family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrual	1,657	1,692
Nonaccrual	0	0
Total	1,657	1,692
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrual	1,440	1,475
Nonaccrual	0	0
Total	$ 1,440	$ 1,475

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