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Investments - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Available for sale, Amortized Cost
Due in one year or less	$ 104,362
Due after one year through five years	345,957
Due after five years through ten years	67,667
Due after ten years	483,137
Agency mortgage-backed securities	727,931
Amortized Cost	1,729,054	$ 1,358,960
Available for sale, Estimated Fair Value
Due in one year or less	104,000
Due after one year through five years	318,556
Due after five years through ten years	60,425
Due after ten years	393,422
Agency mortgage-backed securities	659,404
Securities available-for-sale	1,535,807	1,366,006
Held to maturity, Amortized Cost
Due in one year or less	950
Due after one year through five years	41,312
Due after five years through ten years	179,013
Due after ten years	432,357
Agency mortgage-backed securities	57,018
Amortized Cost	710,650	430,295
Held to maturity, Estimated Fair Value
Due in one year or less	949
Due after one year through five years	38,210
Due after five years through ten years	165,304
Due after ten years	373,452
Agency mortgage-backed securities	50,602
Held to maturity, fair value	$ 628,517	$ 434,672

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