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Regulatory Capital Requirements (Details)
$ in Millions
9 Months Ended
Sep. 30, 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) 0.070  
Tier 1 Capital (to risk weighted assets), ratio (as a percent) 0.085  
Total Capital (to risk weighted assets), ratio (as a percent) 0.105  
Partners Bancorp    
Regulatory Capital Requirements    
Amount available for payment of dividends to stockholders without regulatory approval $ 17.6 $ 14.2
Subsidiaries    
Regulatory Capital Requirements    
Amount available for payment of dividends to stockholders without regulatory approval $ 21.0 $ 17.9