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Investment Securities - Unrealized losses On Debt Securities (Details) $ in Thousands	Dec. 31, 2020 USD ($)
U.S. treasury notes
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 268,839
Gross Unrealized Losses	1,113
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	336,777
Gross Unrealized Losses	3,289
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Fair Value	24,049
Gross Unrealized Losses	149
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	101,983
Gross Unrealized Losses	587
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	132,737
Gross Unrealized Losses	$ 1,341

X

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27337-111563

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456

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- Definition

Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455

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-Name Accounting Standards Codification
-Topic 320
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-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27337-111563

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