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FAIR VALUE MEASUREMENTS (Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
ASSETS    
Securities available for sale, at fair value $ 2,540,419 $ 1,945,445
Loans held for sale, at fair value 96,742 55,405
Fair value hedges   182
LIABILITIES    
Cash flow hedges   1,147
Fair value hedges 12,483 6,256
Quoted Prices in Active Markets for Identical Assets Level 1    
ASSETS    
Securities available for sale, at fair value 0 0
Loans held for sale, at fair value 0 0
Fair value hedges   0
LIABILITIES    
Cash flow hedges   0
Fair value hedges 0 0
Significant Other Observable Inputs Level 2    
ASSETS    
Securities available for sale, at fair value 2,540,419 1,945,445
Loans held for sale, at fair value 96,742 55,405
Fair value hedges   182
LIABILITIES    
Cash flow hedges   1,147
Fair value hedges 12,483 6,256
Significant Unobservable Inputs Level 3    
ASSETS    
Securities available for sale, at fair value 0 0
Loans held for sale, at fair value 0 0
Fair value hedges   0
LIABILITIES    
Cash flow hedges   0
Fair value hedges 0 0
Recurring    
ASSETS    
Loans held for sale, at fair value 96,742 55,405
Interest rate swap 163,360 54,345
Fair value hedges   182
LIABILITIES    
Interest rate swap 163,360 54,345
Cash flow hedges   1,147
Fair value hedges 12,483 6,256
Recurring | Quoted Prices in Active Markets for Identical Assets Level 1    
ASSETS    
Loans held for sale, at fair value 0 0
Interest rate swap 0 0
Fair value hedges   0
LIABILITIES    
Interest rate swap 0 0
Cash flow hedges   0
Fair value hedges 0 0
Recurring | Significant Other Observable Inputs Level 2    
ASSETS    
Loans held for sale, at fair value 96,742 55,405
Interest rate swap 163,360 54,345
Fair value hedges   182
LIABILITIES    
Interest rate swap 163,360 54,345
Cash flow hedges   1,147
Fair value hedges 12,483 6,256
Recurring | Significant Unobservable Inputs Level 3    
ASSETS    
Loans held for sale, at fair value 0 0
Interest rate swap 0 0
Fair value hedges   0
LIABILITIES    
Interest rate swap 0 0
Cash flow hedges   0
Fair value hedges 0 0
U.S. government and agency securities    
ASSETS    
Securities available for sale, at fair value 13,394 21,320
U.S. government and agency securities | Recurring    
ASSETS    
Securities available for sale, at fair value 13,394 21,320
U.S. government and agency securities | Recurring | Quoted Prices in Active Markets for Identical Assets Level 1    
ASSETS    
Securities available for sale, at fair value 0 0
U.S. government and agency securities | Recurring | Significant Other Observable Inputs Level 2    
ASSETS    
Securities available for sale, at fair value 13,394 21,320
U.S. government and agency securities | Recurring | Significant Unobservable Inputs Level 3    
ASSETS    
Securities available for sale, at fair value 0 0
Obligations of states and political subdivisions    
ASSETS    
Securities available for sale, at fair value 837,326 447,091
Obligations of states and political subdivisions | Recurring    
ASSETS    
Securities available for sale, at fair value 837,326 447,091
Obligations of states and political subdivisions | Recurring | Quoted Prices in Active Markets for Identical Assets Level 1    
ASSETS    
Securities available for sale, at fair value 0 0
Obligations of states and political subdivisions | Recurring | Significant Other Observable Inputs Level 2    
ASSETS    
Securities available for sale, at fair value 837,326 447,091
Obligations of states and political subdivisions | Recurring | Significant Unobservable Inputs Level 3    
ASSETS    
Securities available for sale, at fair value 0 0
Corporate and other bonds    
ASSETS    
Securities available for sale, at fair value 151,078 135,959
Corporate and other bonds | Recurring    
ASSETS    
Securities available for sale, at fair value 151,078 135,959
Corporate and other bonds | Recurring | Quoted Prices in Active Markets for Identical Assets Level 1    
ASSETS    
Securities available for sale, at fair value 0 0
Corporate and other bonds | Recurring | Significant Other Observable Inputs Level 2    
ASSETS    
Securities available for sale, at fair value 151,078 135,959
Corporate and other bonds | Recurring | Significant Unobservable Inputs Level 3    
ASSETS    
Securities available for sale, at fair value 0 0
Total mortgage-back securities | Recurring    
ASSETS    
Securities available for sale, at fair value 1,536,996 1,337,996
Total mortgage-back securities | Recurring | Quoted Prices in Active Markets for Identical Assets Level 1    
ASSETS    
Securities available for sale, at fair value 0 0
Total mortgage-back securities | Recurring | Significant Other Observable Inputs Level 2    
ASSETS    
Securities available for sale, at fair value 1,536,996 1,337,996
Total mortgage-back securities | Recurring | Significant Unobservable Inputs Level 3    
ASSETS    
Securities available for sale, at fair value 0 0
Other securities    
ASSETS    
Securities available for sale, at fair value 1,625 3,079
Other securities | Recurring    
ASSETS    
Securities available for sale, at fair value 1,625 3,079
Other securities | Recurring | Quoted Prices in Active Markets for Identical Assets Level 1    
ASSETS    
Securities available for sale, at fair value 0 0
Other securities | Recurring | Significant Other Observable Inputs Level 2    
ASSETS    
Securities available for sale, at fair value 1,625 3,079
Other securities | Recurring | Significant Unobservable Inputs Level 3    
ASSETS    
Securities available for sale, at fair value 0 0
Interest Rate Swap    
ASSETS    
Interest rate swap 163,360 54,345
LIABILITIES    
Interest rate swap 163,360 54,345
Interest Rate Swap | Quoted Prices in Active Markets for Identical Assets Level 1    
ASSETS    
Interest rate swap 0 0
LIABILITIES    
Interest rate swap 0 0
Interest Rate Swap | Significant Other Observable Inputs Level 2    
ASSETS    
Interest rate swap 163,360 54,345
LIABILITIES    
Interest rate swap 163,360 54,345
Interest Rate Swap | Significant Unobservable Inputs Level 3    
ASSETS    
Interest rate swap 0 0
LIABILITIES    
Interest rate swap $ 0 $ 0