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Investments - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Available for sale, Amortized Cost
Due in one year or less	$ 168,521
Due after one year through five years	293,374
Due after five years through ten years	182,181
Due after ten years	362,352
Agency mortgage-backed securities	782,236
Amortized Cost	1,788,664	$ 1,769,134
Available for sale, Estimated Fair Value
Due in one year or less	166,950
Due after one year through five years	275,862
Due after five years through ten years	156,953
Due after ten years	297,157
Agency mortgage-backed securities	719,008
Fair Value	1,615,930	1,618,273
Held to maturity, Amortized Cost
Due in one year or less	5,322
Due after one year through five years	124,793
Due after five years through ten years	159,925
Due after ten years	432,696
Agency mortgage-backed securities	50,226
Amortized Cost	772,962	751,219
Held to maturity, Estimated Fair Value
Due in one year or less	5,205
Due after one year through five years	115,538
Due after five years through ten years	154,200
Due after ten years	383,981
Agency mortgage-backed securities	44,596
Total securities held to maturity	$ 703,520	$ 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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