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Regulatory & Capital Matters (Details) - USD ($)
 1 Months Ended 6 Months Ended
Mar. 31, 2020
Jun. 30, 2020
Jan. 01, 2020
Dec. 31, 2019
Regulatory & Capital Matters        
Tier 1 capital leverage ratio (as a percent)   10.06%   11.93%
Risk-based capital ratio (as a percent)   13.63%   14.53%
Payments of Dividends $ 30,000,000.0      
Phase out of impact of allowance for credit loss     $ 3,800,000  
Deferment of impact on rretained earnings   $ 5,600,000    
Percentage of allowance for credit loss   25.00%    
Change in allowance for credit loss   $ 10,100,000    
Subsidiaries [Member]        
Regulatory & Capital Matters        
Tier 1 capital leverage ratio (as a percent)   10.86%   12.50%
Risk-based capital ratio (as a percent)   14.71%   15.23%
Tier One leverage ratio, basis point decrease (as a percent)   1.64%    
Risk-based capital ratio, basis point decrease (as a percent)   $ 0.52    
Minimum [Member] | Subsidiaries [Member]        
Regulatory & Capital Matters        
Tier 1 capital leverage ratio (as a percent)   8.00%    
Risk-based capital ratio (as a percent)   12.00%    
Tier 1 capital leverage ratio, board-designated threshold   8.00%    
Total Capital Ratio, board-designated threshold (as a percent)   12.00%