Debt Securities Available for Sale - Expected Maturities of Available-for-Sale Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Amortized Cost
One year or less	$ 921
More than one year to five years	84,351
More than five years to ten years	78,740
Available-for-sale debt securities, allocated and single maturity date, total	164,012
Mortgage-backed securities and collateralized mortgage obligations	1,351,929
Amortized Cost	1,515,941	$ 1,701,379
Fair Value
One year or less	906
More than one year to five years	79,080
More than five years to ten years	66,921
Available-for-sale debt securities, allocated and single maturity date, total	146,907
Mortgage-backed securities and collateralized mortgage obligations	1,181,727
Debt securities available for sale, at fair value	$ 1,328,634	$ 1,703,847

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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