Quarterly report pursuant to Section 13 or 15(d)

SECURITIES (Amortized Cost of AFS Securities by Security Type and Credit Rating) (Details)

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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
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