Debt Securities Available for Sale - Expected Maturities of Available-for-Sale Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Amortized Cost
One year or less	$ 920
More than one year to five years	54,891
More than five years to ten years	63,862
Available-for-sale debt securities, allocated and single maturity date, total	119,673
Mortgage-backed securities and collateralized mortgage obligations	1,054,116
Amortized Cost	1,173,789	$ 1,515,941
Fair Value
One year or less	917
More than one year to five years	50,578
More than five years to ten years	49,145
Available-for-sale debt securities, allocated and single maturity date, total	100,640
Mortgage-backed securities and collateralized mortgage obligations	896,819
Fair Value	$ 997,459	$ 1,328,634

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