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Investments - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Available for sale, Amortized Cost
Due in one year or less	$ 81,809
Due after one year through five years	166,470
Due after five years through ten years	40,130
Due after ten years	561,308
Agency mortgage-backed securities	509,243
Amortized Cost	1,358,960	$ 882,682
Available for sale, Estimated Fair Value
Due in one year or less	81,797
Due after one year through five years	165,161
Due after five years through ten years	40,568
Due after ten years	564,621
Agency mortgage-backed securities	513,859
Securities available-for-sale	1,366,006	912,429
Held to maturity, Amortized Cost
Due in one year or less	211
Due after one year through five years	13,793
Due after five years through ten years	143,900
Due after ten years	204,286
Agency mortgage-backed securities	68,105
Amortized Cost	430,295	488,059
Held to maturity, Estimated Fair Value
Due in one year or less	214
Due after one year through five years	13,998
Due after five years through ten years	146,933
Due after ten years	205,148
Agency mortgage-backed securities	68,379
Held to maturity, fair value	$ 434,672	$ 501,523

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