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Investments - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Available for sale, Amortized Cost
Due in one year or less	$ 163,297
Due after one year through five years	303,371
Due after five years through ten years	160,265
Due after ten years	383,028
Agency mortgage-backed securities	767,508
Amortized Cost	1,777,469	$ 1,769,134
Available for sale, Estimated Fair Value
Due in one year or less	161,711
Due after one year through five years	284,316
Due after five years through ten years	141,132
Due after ten years	320,533
Agency mortgage-backed securities	704,191
Fair Value	1,611,883	1,618,273
Held to maturity, Amortized Cost
Due in one year or less	785
Due after one year through five years	103,383
Due after five years through ten years	176,180
Due after ten years	426,743
Agency mortgage-backed securities	51,276
Amortized Cost	758,367	751,219
Held to maturity, Estimated Fair Value
Due in one year or less	783
Due after one year through five years	96,428
Due after five years through ten years	169,432
Due after ten years	382,634
Agency mortgage-backed securities	45,497
Fair Value	$ 694,774	$ 696,647

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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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