Debt Securities Available for Sale - Expected Maturities of Available-for-Sale Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Amortized Cost
One year or less	$ 919
More than one year to five years	68,971
More than five years to ten years	89,864
Available-for-sale debt securities, allocated and single maturity date, total	159,754
Mortgage-backed securities and collateralized mortgage obligations	1,399,397
Amortized Cost	1,559,151	$ 1,701,379
Fair Value
One year or less	901
More than one year to five years	65,791
More than five years to ten years	81,377
Available-for-sale debt securities, allocated and single maturity date, total	148,069
Mortgage-backed securities and collateralized mortgage obligations	1,223,652
Fair Value	$ 1,371,721	$ 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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