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Regulatory & Capital Matters (Details)
$ in Millions
 6 Months Ended
Aug. 07, 2023
USD ($)
Jun. 30, 2023
USD ($)
Dec. 31, 2022
Regulatory & Capital Matters      
Tier 1 capital leverage ratio (as a percent)   0.0896 0.0814
Risk-based capital ratio (as a percent)   0.1316 0.1252
Payments of Dividends $ 2.2    
Deferment of impact on retained earnings   $ 1.9  
Subsidiaries [Member]      
Regulatory & Capital Matters      
Tier 1 capital leverage ratio (as a percent)   0.0970 0.0932
Risk-based capital ratio (as a percent)   0.1283 0.1275
Tier One leverage ratio, basis point increase (as a percent)   0.38%  
Risk-based capital ratio, basis point increase (as a percent)   0.08%  
Risk-based capital ratio, basis point decrease (as a percent)   0.08%  
Minimum | Subsidiaries [Member]      
Regulatory & Capital Matters      
Tier 1 capital leverage ratio (as a percent)   0.08  
Risk-based capital ratio (as a percent)   0.12  
Tier 1 capital leverage ratio, board-designated threshold   8.00%  
Total Capital Ratio, board-designated threshold (as a percent)   12.00%