Regulatory Capital Requirements - Capital Conservation Buffer (Details)	Sep. 30, 2023	Dec. 31, 2022
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Effective CET1 capital to risk-weighted assets (as a percent)	0.1221	0.1182
Effective Tier 1 capital to risk-weighted assets (as a percent)	0.1221	0.1182
Effective total capital to risk-weighted assets (as a percent)	0.1338	0.1292
Capital conservation buffer
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Effective CET1 capital to risk-weighted assets (as a percent)	0.07
Effective Tier 1 capital to risk-weighted assets (as a percent)	0.085
Effective total capital to risk-weighted assets (as a percent)	0.105
Capital requirements above regulatory rate (as a percent)	0.025