Regulatory Matters (Narrative) (Details)	12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Cash dividends paid to parent Company by consolidated subsidiaries	$ 52,000,000	$ 145,000,000	$ 253,000,000
Amount available to be paid as dividends without prior regulatory approval	$ 703,800,000
Minimum ratio of qualifying total capital to risk-weighted assets	0.080
Tier 1 common equity capital required for capital adequacy to risk weighted assets	0.0450
Tier 1 risk based capital required for capital adequacy to risk weighted assets	0.060
Tier 1 leverage capital required for capital adequacy to average assets	0.040
Ratio required for banks to be well capitalized, total capital to risk-weighted assets	0.100
Ratio required for banks to be well capitalized, Tier 1 capital to risk-weighted assets	0.080
Ratio required for banks to be well capitalized, Common Equity Tier 1 capital risk weighted assets	0.065
Ratio required for banks to be well capitalized, Tier 1 leverage ratio	0.050
Federal Reserve Bank
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Cash reserve requirement	$ 0	$ 0	$ 0