Investment Securities - Investments in Debt and Equity Securities Reported Less than Historical Cost (Details) - Investments reported at less than historical cost - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Schedule of Investments [Line Items]
Historical cost	$ 2,271,810	$ 658,858
Fair value	2,022,665	645,218
Gross unrealized losses	$ 249,145	$ 13,640
Percent of the Corporation's investments available for sale	88.10%	27.50%