Investment Securities - Contractual Maturities of Debt Securities Held to Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Amortized Cost
Due in one year	$ 68,033
Due after one year through five years	126,908
Due after five years through ten years	95,472
Due after ten years	615,198
Residential mortgage-backed securities	2,861,227
Amortized Cost	3,766,838	$ 3,828,984
Fair Value
Due in one year	67,619
Due after one year through five years	123,033
Due after five years through ten years	87,948
Due after ten years	538,829
Residential mortgage-backed securities	2,461,519
Total	$ 3,278,948	$ 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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