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Commitments and Contingencies: Schedule of significant off-balance sheet commitments (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Mar. 31, 2015
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability $ 144,877 $ 100,178
Adjustable-rate    
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability 25,186 13,410
Fixed-rate    
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability 16,689 3,652
Standby letters of credit    
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability 1,379 1,105
Undisbursed loan funds and unused lines of credit    
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability $ 101,623 $ 82,011