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Investments - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Available for sale, Amortized Cost
Due in one year or less	$ 207,822
Due after one year through five years	141,250
Due after five years through ten years	317,131
Due after ten years	314,421
Agency mortgage-backed securities	1,473,138
Amortized Cost	2,453,762	$ 2,025,483
Available for sale, Estimated Fair Value
Due in one year or less	205,486
Due after one year through five years	138,032
Due after five years through ten years	282,830
Due after ten years	280,593
Agency mortgage-backed securities	1,444,552
Fair Value	2,351,493	1,862,270
Held to maturity, Amortized Cost
Due in one year or less	5,226
Due after one year through five years	125,772
Due after five years through ten years	240,152
Due after ten years	666,030
Agency mortgage-backed securities	44,837
Amortized Cost	1,082,017	929,192
Held to maturity, Estimated Fair Value
Due in one year or less	5,226
Due after one year through five years	122,173
Due after five years through ten years	238,874
Due after ten years	624,760
Agency mortgage-backed securities	41,328
Total securities held-to-maturity	$ 1,032,361	$ 858,871

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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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