Investment Securities - Contractual Maturities of Debt Securities Held to Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Amortized Cost
Due in one year	$ 63,872
Due after one year through five years	169,205
Due after five years through ten years	96,385
Due after ten years	624,245
Residential mortgage-backed securities	2,893,505
Amortized Cost	3,847,212	$ 3,828,984
Fair Value
Due in one year	63,355
Due after one year through five years	165,906
Due after five years through ten years	92,034
Due after ten years	553,621
Residential mortgage-backed securities	2,525,568
Total	$ 3,400,484	$ 3,329,470

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

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