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Capital Ratio (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Capital Requirements    
CET 1 ratio 18.23% 18.58%
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 20.36% 20.46%
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent) 19.45% 19.80%
Tier 1 capital (to Average Assets), Actual Ratio (as a percent) 16.03% 16.65%
Percentage of capital securities issued by trust qualifying as Tier I capital, maximum 25.00%  
Percentage of capital securities issued by trust qualifying as Tier II capital, minimum 25.00%  
Capital securities issued by the trust, qualifying as Tier I capital $ 134,642