ALLOWANCE FOR LOAN LOSSES: TDRs by Interest Accrual Status (Details 7) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrual	$ 5,581	$ 9,429
Nonaccrual	2,141	2,437
Total	7,722	11,866
Commercial and construction | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrual	826	0
Nonaccrual	178	294
Total	1,004	294
Commercial and construction | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrual	1,683	6,262
Nonaccrual	1,200	1,342
Total	2,883	7,604
Commercial and construction | Land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrual	0	0
Nonaccrual	763	801
Total	763	801
Commercial and construction | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrual	1,644	1,692
Nonaccrual	0	0
Total	1,644	1,692
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrual	1,428	1,475
Nonaccrual	0	0
Total	$ 1,428	$ 1,475