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SECURITIES (Amortized Cost of AFS Securities by Security Type and Credit Rating) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |
AFS Securities, Amortized Cost | $ 2,352,916 | $ 1,893,427
U.S. government and agency securities |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |
AFS Securities, Amortized Cost | 13,463 | 21,149
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |
AFS Securities, Amortized Cost | 759,936 | 421,344
Corporate and other bonds |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |
AFS Securities, Amortized Cost | 147,438 | 134,342
Other securities |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |
AFS Securities, Amortized Cost | $ 1,621 | $ 3,079

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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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