Debt Securities Held to Maturity - Expected Maturities of Held-to-Maturity Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Amortized cost
More than one year to five years	$ 14,875
More than five years to ten years	19,995
More than ten years	10,000
Held-to-maturity debt securities, allocated and single maturity date, total	44,870
Mortgage-backed securities and collateralized mortgage obligations	384,864
Amortized Cost	429,734
Fair value
More than one year to five years	14,754
More than five years to ten years	19,539
More than ten years	9,818
Held-to-maturity debt securities, allocated and single maturity date, total	44,111
Mortgage-backed securities and collateralized mortgage obligations	390,678
Debt securities held to maturity	434,789	$ 277,091
Mortgage-backed securities and collateralized mortgage obligations
Fair value
Debt securities held to maturity	390,678	272,090
U.S. government and agency obligations
Fair value
Debt securities held to maturity	$ 44,111	$ 5,001

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

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