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Investment Securities Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Schedule of Investments [Line Items] |  |  |
Marketable Securities, Unrealized Gain (Loss) |  | $ (400) |
Proceeds from sales of AFS securities | $ 108,961 | 59,342 |
Visa |  |  |
Schedule of Investments [Line Items] |  |  |
Gain on sale of shares |  | 34,000 |
Auction Rate Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Proceeds from sales of AFS securities |  | $ 24,600 |
Collateral Pledged [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Securities pledged as collateral | $ 2,300,000 |  | $ 2,500,000

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- Definition Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 210 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=120413173&loc=SL6242262-115580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 210 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120413209&loc=SL6242269-115581 + Details
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