Investment Securities - Allowance for Credit Losses AFS (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 0
Provision for credit loss expense	12,800
Reduction due to sales	(2,078)
Securities charged-off	(7,000)
Net decrease in allowance on previously impaired securities	(3,722)
Ending balance	0
State and political subdivisions
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Beginning balance	0
Provision for credit loss expense	0
Reduction due to sales	0
Securities charged-off	0
Net decrease in allowance on previously impaired securities	0
Ending balance	0
Other securities
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Beginning balance	0
Provision for credit loss expense	12,800
Reduction due to sales	(2,078)
Securities charged-off	(7,000)
Net decrease in allowance on previously impaired securities	(3,722)
Ending balance	$ 0