Loans Receivable and Allowance for Credit Losses - Allowance for Credit Losses Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022 USD ($) qtr	Dec. 31, 2021 USD ($)
Financing Receivable, Allowance for Credit Losses
Life time loss rate, period span | qtr		11
Financing receivable and off balance sheet credit loss allowance		$ 621.9	$ 569.1
Decrease in allowance for credit losses		$ 52.8
Annual GDP growth rate (in percent)		1.90%
Average increase in the unemployment rate (in percent)		3.70%
Credit Derivative, Term		10 years
Forecast
Financing Receivable, Allowance for Credit Losses
Annual GDP growth rate (in percent)	0.90%
Average increase in the unemployment rate (in percent)	4.00%
Average decline of annual GDP rate (in percent)	1.30%
Average rising of unemployment rate (in percent)	6.80%
Higher GDP growth rate (in percent)	2.60%
Improving of unemployment rate and no recession (in percent)	3.50%