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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

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