Investment Securities - Contractual Maturities of Investments Debt Securities Held to Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Amortized Cost
Due in one year	$ 61,885
Due after one year through five years	140,907
Due after five years through ten years	85,773
Due after ten years	631,313
Residential mortgage-backed securities	2,909,106
Amortized Cost	3,828,984	$ 2,668,697
Fair Value
Due in one year	61,217
Due after one year through five years	138,074
Due after five years through ten years	80,934
Due after ten years	553,448
Residential mortgage-backed securities	2,495,797
Total	$ 3,329,470	$ 2,660,605