Debt Securities Available for Sale - Expected Maturities of Available-for-Sale Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Amortized Cost
One year or less	$ 50,854
More than one year to five years	122,038
More than five years to ten years	68,830
Available-for-sale debt securities, allocated and single maturity date, total	241,722
Mortgage-backed securities and collateralized mortgage obligations	1,009,508
Amortized Cost	1,251,230	$ 1,515,941
Fair Value
One year or less	50,924
More than one year to five years	119,556
More than five years to ten years	55,492
Available-for-sale debt securities, allocated and single maturity date, total	225,972
Mortgage-backed securities and collateralized mortgage obligations	867,585
Debt securities available for sale, at fair value	$ 1,093,557	$ 1,328,634

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