Debt Securities Held to Maturity - Expected Maturities of Held-to-Maturity Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Amortized Cost
More than one year to five years	$ 14,875
More than five years to ten years	19,996
More than ten years	10,000
Held-to-maturity debt securities, allocated and single maturity date, total	44,871
Mortgage-backed securities and collateralized mortgage obligations	374,162
Amortized Cost	419,033	$ 429,734
Fair Value
More than one year to five years	14,113
More than five years to ten years	18,381
More than ten years	9,019
Held-to-maturity debt securities, allocated and single maturity date, total	41,513
Mortgage-backed securities and collateralized mortgage obligations	357,511
Debt securities held to maturity	$ 399,024	$ 434,789

Amount excluding accrued interest, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

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