Investment Securities - Contractual Maturities of Debt Securities Held to Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Amortized Cost
Due in one year	$ 31,783
Due after one year through five years	195,679
Due after five years through ten years	86,011
Due after ten years	596,965
Residential mortgage-backed securities	2,811,582
Amortized Cost	3,722,020	$ 2,668,697
Fair Value
Due in one year	31,721
Due after one year through five years	191,824
Due after five years through ten years	79,844
Due after ten years	509,682
Residential mortgage-backed securities	2,373,581
Total	$ 3,186,652	$ 2,660,605

Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

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