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Investments - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Available for sale, Amortized Cost
Due in one year or less	$ 11,176
Due after one year through five years	23,972
Due after five years through ten years	32,875
Due after ten years	385,280
Agency mortgage-backed securities	477,151
Amortized Cost	930,454	$ 882,682
Available for sale, Estimated Fair Value
Due in one year or less	11,316
Due after one year through five years	24,517
Due after five years through ten years	33,175
Due after ten years	384,571
Agency mortgage-backed securities	492,081
Available for sale, fair value	945,660	912,429
Held to maturity, Amortized Cost
Due in one year or less	0
Due after one year through five years	12,733
Due after five years through ten years	132,553
Due after ten years	225,445
Agency mortgage-backed securities	96,777
Amortized Cost	467,508	488,059
Held to maturity, Estimated Fair Value
Due in one year or less	0
Due after one year through five years	13,109
Due after five years through ten years	135,497
Due after ten years	223,742
Agency mortgage-backed securities	97,751
Held to maturity, fair value	$ 470,099	$ 501,523

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-Section 50
-Paragraph 5
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563

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- Definition

Fair value of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563

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