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DISCLOSURES ABOUT FAIR VALUE OF ASSETS AND LIABILITIES - Fair Value Measurements of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale $ 1,983,972 $ 2,344,551
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 2,067 999
Significant Other Observable Inputs (Level 2)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 1,976,398 2,338,061
Significant Unobservable Inputs (Level 3)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 5,507 5,491
Recurring | Derivative liabilities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative liabilities 98,809 41,968
Recurring | U.S. Treasury    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 2,067 999
Recurring | U.S. Government-sponsored agency securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 105,766 95,136
Recurring | State and municipal    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 1,344,956 1,576,532
Recurring | U.S. Government-sponsored mortgage-backed securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 518,789 667,605
Recurring | Corporate obligations    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 12,394 4,279
Recurring | Derivative assets    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative assets 99,086 41,133
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivative liabilities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative liabilities 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasury    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 2,067 999
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Government-sponsored agency securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | State and municipal    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Government-sponsored mortgage-backed securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate obligations    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivative assets    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative assets 0 0
Recurring | Significant Other Observable Inputs (Level 2) | Derivative liabilities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative liabilities 98,809 41,968
Recurring | Significant Other Observable Inputs (Level 2) | U.S. Treasury    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 0 0
Recurring | Significant Other Observable Inputs (Level 2) | U.S. Government-sponsored agency securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 105,766 95,136
Recurring | Significant Other Observable Inputs (Level 2) | State and municipal    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 1,339,484 1,571,076
Recurring | Significant Other Observable Inputs (Level 2) | U.S. Government-sponsored mortgage-backed securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 518,785 667,601
Recurring | Significant Other Observable Inputs (Level 2) | Corporate obligations    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 12,363 4,248
Recurring | Significant Other Observable Inputs (Level 2) | Derivative assets    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative assets 99,086 41,133
Recurring | Significant Unobservable Inputs (Level 3) | Derivative liabilities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative liabilities 0 0
Recurring | Significant Unobservable Inputs (Level 3) | U.S. Treasury    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 0 0
Recurring | Significant Unobservable Inputs (Level 3) | U.S. Government-sponsored agency securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 0 0
Recurring | Significant Unobservable Inputs (Level 3) | State and municipal    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 5,472 5,456
Recurring | Significant Unobservable Inputs (Level 3) | U.S. Government-sponsored mortgage-backed securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 4 4
Recurring | Significant Unobservable Inputs (Level 3) | Corporate obligations    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 31 31
Recurring | Significant Unobservable Inputs (Level 3) | Derivative assets    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative assets $ 0 $ 0