Regulatory Matters (Capital Ratios) (Details)	Dec. 31, 2023	Dec. 31, 2022
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]
CETI to risk-weighted assets, Minimum capital requirement	0.045
CETI to risk-weighted assets, Capital conservation buffer	0.025
CETI to risk-weighted assets, Minimum capital ratio requirement with capital conservation buffer	0.070
CETI to risk-weighted assets, Capital ratio	0.103	0.098
Tier 1 capital CETI plus additional Tier 1 capital) to risk-weighted assets, Minimum capital requirement	0.060
Tier 1 capital CETI plus additional Tier 1 capital) to risk-weighted assets, Capital conservation buffer	0.025
Tier 1 capital CETI plus additional Tier 1 capital) to risk-weighted assets, Minimum capital ratio requirement with capital conservation buffer	0.085
Tier 1 capital CETI plus additional Tier 1 capital) to risk-weighted assets, Capital ratio	0.109	0.105
Total capital (Tier 1 capital plus Tier 2 capital) to risk-weighted assets, Minimum capital requirements	0.080
Total capital (Tier 1 capital plus Tier 2 capital) to risk-weighted assets, Capital conversion buffer	0.025
Total capital (Tier 1 capital plus Tier 2 capital) to risk-weighted assets, Minimum capital ratio requirement with capital conservation buffer	0.105
Total capital (Tier 1 capital plus Tier 2 capital) to risk-weighted assets, Capital ratio	0.128	0.122
Tier 1 capital to average consolidated assets, Minimum capital requirement	0.040
Tier 1 capital to average consolidated assets, Minimum capital requirement with buffer	4.00%
Tier 1 capital to average consolidated assets, Capital ratio	0.083	0.077