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Consolidated Balance Sheets (Parenthetical) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
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Statement of Financial Position [Abstract] |  |
Mortgages Held-for-sale, Fair Value Disclosure | $ 39,396,000 | $ 9,181,000
Debt Securities, Available-for-sale, Amortized Cost | 12,097,533,000 | 8,435,531,000
Debt Securities, Available-for-sale, Allowance for Credit Loss | $ 0 | $ 0
Preferred stock, par value | $ 1 | $ 1
Preferred stock, shares authorized | 2,000,000 | 2,000,000
Preferred stock, shares issued | 0 | 6,000
Common stock, par value | $ 5 | $ 5
Common stock, shares authorized | 140,000,000 | 140,000,000
Common stock, shares issued | 117,870,372 | 112,795,605
Treasury stock, shares | 497,413 | 445,952

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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=121645371&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=121558606&loc=SL82898722-210454 + Details
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