Debt Securities Held to Maturity - Expected Maturities of Held-to-Maturity Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Amortized Cost
More than one year to five years	$ 29,875
More than five years to ten years	9,996
More than ten years	10,000
Held-to-maturity debt securities, allocated and single maturity date, total	49,871
Mortgage-backed securities and collateralized mortgage obligations	362,074
Amortized Cost	411,945	$ 421,523
Fair Value
More than one year to five years	26,783
More than five years to ten years	8,022
More than ten years	7,085
Held-to-maturity debt securities, allocated and single maturity date, total	41,890
Mortgage-backed securities and collateralized mortgage obligations	310,037
Debt securities held to maturity	$ 351,927	$ 370,391