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Investment Securities - Visa Class B Restricted Shares (Details) - Visa $ in Thousands	9 Months Ended
	Sep. 30, 2021 USD ($) shares	Dec. 31, 2020 USD ($) shares
Common Class A
Securities
Investment shares owned, if converted	11,236	11,236
Common Class B
Securities
Conversion ratio	1.6228
Investment shares owned	6,924	6,924
Cost basis | $	$ 0	$ 0

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- Definition

Cost basis carrying value of equity security class shares.

+ References

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- Definition

Conversion ratio from Class B shares to Class A.

+ References

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- Definition

Balance of shares at end of period, if converted.

+ References

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- Definition

Balance held at close of period in number of shares.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section 50
-Paragraph 6
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=99383244&loc=d3e12121-115841

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-12B(Column B))
-URI http://asc.fasb.org/extlink&oid=120401592&loc=d3e611197-123010

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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