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Investment Securities: Schedule of significant inputs utilized to measure management's estimate of the credit loss component on OTTI securities (Details)
Dec. 31, 2016
Dec. 31, 2015
Minimum    
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]    
OTTI significant inputs - Constant prepayment rate 6.00% 6.00%
OTTI significant inputs - Collateral default rate 0.34% 0.11%
OTTI significant inputs - Loss severity rate 5.00% 1.00%
Maximum    
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]    
OTTI significant inputs - Constant prepayment rate 15.00% 15.00%
OTTI significant inputs - Collateral default rate 13.35% 15.97%
OTTI significant inputs - Loss severity rate 81.00% 77.00%
Weighted Average    
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]    
OTTI significant inputs - Constant prepayment rate 12.28% 9.63%
OTTI significant inputs - Collateral default rate 5.66% 5.33%
OTTI significant inputs - Loss severity rate 46.05% 40.54%