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Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Statement of Financial Position [Abstract] |  |
Allowance for credit losses on HTM | $ 1,279 | $ 2,915
Available-for-sale, allowance for credit loss | 0 | 312
Available-for-sale, amortized cost | $ 7,130,861 | $ 3,397,043
Preferred stock, Series D, shares authorized (in shares) |  | 40,040,000
Preferred stock, Series D, par value (in dollars per share) |  | $ 0.01
Preferred stock, Series D, liquidation value (in dollars per share) |  | $ 1,000
Preferred stock, Series D, shares issued (in shares) |  | 767
Preferred stock, Series D, shares outstanding (in shares) |  | 767
Common stock, Class A, par value (in dollars per share) | $ 0.01 | $ 0.01
Common stock, Class A, shares authorized (in shares) | 175,000,000 | 175,000,000
Common stock, Class A, shares issued (in shares) | 112,715,444 | 108,077,662
Common stock, Class A, shares outstanding (in shares) | 112,715,444 | 108,077,662

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- Definition Amortized cost of 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 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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