Regulatory & Capital Matters (Details) $ in Millions	Dec. 31, 2022 USD ($)	Dec. 31, 2021
Regulatory & Capital Matters
Tier 1 capital leverage ratio (as a percent)	0.0814	0.0781
Risk-based capital ratio (as a percent)	0.1252	0.1255
Phase out of impact of allowance for credit loss	$ 3.8
Deferment of impact on retained earnings	$ 2.9
Subsidiaries [Member]
Regulatory & Capital Matters
Tier 1 capital leverage ratio (as a percent)	0.0932	0.0958
Risk-based capital ratio (as a percent)	0.1275	0.1346
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