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12) Mortgage Servicing Rights: Assumptions used in determining MSR value (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Details    
Prepayment Speeds 3.54% 3.86%
Average Life in Years of MSR 5.8 6.33
Discount Rate 9.51 9.51