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Regulatory Capital Requirements (Details)
$ in Millions
3 Months Ended
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Minimum | FDIC    
Regulatory Capital Requirements    
Common Equity Tier 1 Capital (to risk weighted assets), ratio (as a percent) 0.045  
Tier 1 Capital (to risk weighted assets), ratio (as a percent) 0.060  
Total Capital (to risk weighted assets), ratio (as a percent) 0.080  
Tier 1 Leverage ratio (as a percent) 0.040  
Basel III Capital Rules | FDIC    
Regulatory Capital Requirements    
Capital conservation buffer ratio 2.50%  
Basel III Capital Rules | Minimum | FDIC    
Regulatory Capital Requirements    
Common Equity Tier 1 Capital (to risk weighted assets), ratio (as a percent) 7.0  
Tier 1 Capital (to risk weighted assets), ratio (as a percent) 8.5  
Total Capital (to risk weighted assets), ratio (as a percent) 10.5  
Partners Bancorp    
Regulatory Capital Requirements    
Amount available for payment of dividends to stockholders without regulatory approval $ 11.2 $ 14.2
Subsidiaries    
Regulatory Capital Requirements    
Amount available for payment of dividends to stockholders without regulatory approval $ 14.0 $ 17.9