Investment Securities - Contractual Maturities of Debt Securities Held to Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Amortized Cost
Due in one year	$ 33,206
Due after one year through five years	220,521
Due after five years through ten years	73,729
Due after ten years	616,593
Residential mortgage-backed securities	2,775,928
Amortized Cost	3,719,977	$ 2,668,697
Fair Value
Due in one year	33,186
Due after one year through five years	219,462
Due after five years through ten years	72,398
Due after ten years	575,932
Residential mortgage-backed securities	2,492,737
Total	$ 3,393,715	$ 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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