Debt Securities - Maturity of Debt Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Amortized Cost
Due in one year or less	$ 176,516
Due after one year through five years	410,372
Due after five years through ten years	353,968
Due after ten years	1,934,992
Amortized Cost	2,875,848	$ 4,013,523
Fair Value
Due in one year or less	174,227
Due after one year through five years	379,095
Due after five years through ten years	319,381
Due after ten years	1,674,338
Fair Value	2,547,041	3,981,251
Amortized Cost
Due after one year through five years	46,961
Due after five years through ten years	65,516
Due after ten years	823,851
Amortized Cost	936,328	$ 0
Fair Value
Due after one year through five years	43,738
Due after five years through ten years	58,346
Due after ten years	706,801
Debt securities held to maturity	$ 808,885