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Investments - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Available for sale, Amortized Cost
Due in one year or less	$ 12,048
Due after one year through five years	21,977
Due after five years through ten years	19,711
Due after ten years	322,243
Agency mortgage-backed securities	506,703
Amortized Cost	882,682	$ 1,115,323
Available for sale, Estimated Fair Value
Due in one year or less	12,240
Due after one year through five years	22,629
Due after five years through ten years	20,105
Due after ten years	330,883
Agency mortgage-backed securities	526,572
Securities available-for-sale	912,429	1,135,317
Held to maturity, Amortized Cost
Due in one year or less	0
Due after one year through five years	11,589
Due after five years through ten years	132,613
Due after ten years	231,115
Agency mortgage-backed securities	112,742
Amortized Cost	488,059	181,166
Held to maturity, Estimated Fair Value
Due in one year or less	0
Due after one year through five years	12,040
Due after five years through ten years	141,252
Due after ten years	233,690
Agency mortgage-backed securities	114,541
Held to maturity, fair value	$ 501,523	$ 181,939

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-SubTopic 10
-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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