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FAIR VALUE MEASUREMENTS (Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
ASSETS |  |
Securities available for sale, at fair value | $ 3,195,176 | $ 2,540,419
Loans held for sale, at fair value | 35,417 | 96,742
LIABILITIES |  |
Fair value hedges | 6,769 | 12,483
Quoted Prices in Active Markets for Identical Assets Level 1 |  |
ASSETS |  |
Securities available for sale, at fair value | 64,955 | 0
Loans held for sale, at fair value | 0 | 0
LIABILITIES |  |
Fair value hedges | 0 | 0
Significant Other Observable Inputs Level 2 |  |
ASSETS |  |
Securities available for sale, at fair value | 3,130,221 | 2,540,419
Loans held for sale, at fair value | 35,417 | 96,742
LIABILITIES |  |
Fair value hedges | 6,769 | 12,483
Significant Unobservable Inputs Level 3 |  |
ASSETS |  |
Securities available for sale, at fair value | 0 | 0
Loans held for sale, at fair value | 0 | 0
LIABILITIES |  |
Fair value hedges | 0 | 0
Recurring |  |
ASSETS |  |
Loans held for sale, at fair value | 35,417 | 96,742
LIABILITIES |  |
Fair value hedges | 6,769 | 12,483
Recurring | Quoted Prices in Active Markets for Identical Assets Level 1 |  |
ASSETS |  |
Loans held for sale, at fair value | 0 | 0
LIABILITIES |  |
Fair value hedges | 0 | 0
Recurring | Significant Other Observable Inputs Level 2 |  |
ASSETS |  |
Loans held for sale, at fair value | 35,417 | 96,742
LIABILITIES |  |
Fair value hedges | 6,769 | 12,483
Recurring | Significant Unobservable Inputs Level 3 |  |
ASSETS |  |
Loans held for sale, at fair value | 0 | 0
LIABILITIES |  |
Fair value hedges | 0 | 0
U.S. government and agency securities |  |
ASSETS |  |
Securities available for sale, at fair value | 74,818 | 13,394
U.S. government and agency securities | Recurring |  |
ASSETS |  |
Securities available for sale, at fair value | 74,818 | 13,394
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 | 64,955 | 0
U.S. government and agency securities | Recurring | Significant Other Observable Inputs Level 2 |  |
ASSETS |  |
Securities available for sale, at fair value | 9,863 | 13,394
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 | 998,881 | 837,326
Obligations of states and political subdivisions | Recurring |  |
ASSETS |  |
Securities available for sale, at fair value | 998,881 | 837,326
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 | 998,881 | 837,326
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 | 149,028 | 151,078
Corporate and other bonds | Recurring |  |
ASSETS |  |
Securities available for sale, at fair value | 149,028 | 151,078
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 | 149,028 | 151,078
Corporate and other bonds | Recurring | Significant Unobservable Inputs Level 3 |  |
ASSETS |  |
Securities available for sale, at fair value | 0 | 0
Mortgage-backed securities | Recurring |  |
ASSETS |  |
Securities available for sale, at fair value | 1,970,813 | 1,536,996
Mortgage-backed securities | Recurring | Quoted Prices in Active Markets for Identical Assets Level 1 |  |
ASSETS |  |
Securities available for sale, at fair value | 0 | 0
Mortgage-backed securities | Recurring | Significant Other Observable Inputs Level 2 |  |
ASSETS |  |
Securities available for sale, at fair value | 1,970,813 | 1,536,996
Mortgage-backed 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 | 1,636 | 1,625
Other securities | Recurring |  |
ASSETS |  |
Securities available for sale, at fair value | 1,636 | 1,625
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 | 1,636 | 1,625
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 | 90,246 | 163,360
LIABILITIES |  |
Interest rate swap | 52,096 | 163,360
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 | 90,246 | 163,360
LIABILITIES |  |
Interest rate swap | 52,096 | 163,360
Interest Rate Swap | Significant Unobservable Inputs Level 3 |  |
ASSETS |  |
Interest rate swap | 0 | 0
LIABILITIES |  |
Interest rate swap | 0 | 0
Interest Rate Swap | Recurring |  |
ASSETS |  |
Interest rate swap | 90,246 | 163,360
LIABILITIES |  |
Interest rate swap | 52,096 | 163,360
Interest Rate Swap | Recurring | 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 | Recurring | Significant Other Observable Inputs Level 2 |  |
ASSETS |  |
Interest rate swap | 90,246 | 163,360
LIABILITIES |  |
Interest rate swap | 52,096 | 163,360
Interest Rate Swap | Recurring | Significant Unobservable Inputs Level 3 |  |
ASSETS |  |
Interest rate swap | 0 | 0
LIABILITIES |  |
Interest rate swap | $ 0 | $ 0

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