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Investments - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Available for sale, Amortized Cost
Due in one year or less	$ 104,552
Due after one year through five years	361,488
Due after five years through ten years	103,873
Due after ten years	438,308
Agency mortgage-backed securities	713,896
Amortized Cost	1,722,117	$ 1,729,054
Available for sale, Estimated Fair Value
Due in one year or less	103,752
Due after one year through five years	334,362
Due after five years through ten years	87,087
Due after ten years	333,933
Agency mortgage-backed securities	627,970
Fair Value	1,487,104	1,535,807
Held to maturity, Amortized Cost
Due in one year or less	1,220
Due after one year through five years	65,625
Due after five years through ten years	194,325
Due after ten years	417,011
Agency mortgage-backed securities	53,259
Amortized Cost	731,440	710,650
Held to maturity, Estimated Fair Value
Due in one year or less	1,213
Due after one year through five years	60,259
Due after five years through ten years	176,400
Due after ten years	339,006
Agency mortgage-backed securities	45,782
Fair Value	$ 622,660	$ 628,517

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Fair value of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in next 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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Fair value of investment in debt security measured at amortized cost (held-to-maturity), without single maturity date and not allocated over maturity grouping.

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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