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Capital Ratios (Details)
Jun. 30, 2019
Dec. 31, 2018
Capital Requirements    
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 19.67% 19.74%
CET 1 ratio 17.82% 17.55%
Tier 1 capital (to Average Assets), Actual Ratio (as a percent) 16.03% 15.87%
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent) 19.04% 19.06%