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INVESTMENTS (Schedule of Unrealized Gross Losses and Estimated Fair values of Investment Securities) (Details)
$ in Thousands
Jun. 30, 2021
USD ($)
security
Dec. 31, 2020
USD ($)
security
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, Securities in Unrealized Loss Positions, Number of Holdings | security 103 30
Fair Value - Less Than 12 Months $ 550,272 $ 107,635
Unrealized Losses - Less Than 12 Months (7,162) (916)
Fair Value - 12 Months of More 6,625 980
Unrealized Losses - 12 Months or More (314) (6)
Fair Value 556,897 108,615
Unrealized losses $ (7,476) $ (922)
Obligations of states and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, Securities in Unrealized Loss Positions, Number of Holdings | security 2 1
Fair Value - Less Than 12 Months $ 1,294 $ 2,404
Unrealized Losses - Less Than 12 Months (2) (115)
Fair Value - 12 Months of More 2,265 0
Unrealized Losses - 12 Months or More (253) 0
Fair Value 3,559 2,404
Unrealized losses $ (255) $ (115)
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, Securities in Unrealized Loss Positions, Number of Holdings | security 54 15
Fair Value - Less Than 12 Months $ 329,607 $ 61,222
Unrealized Losses - Less Than 12 Months (3,358) (568)
Fair Value - 12 Months of More 297 980
Unrealized Losses - 12 Months or More (2) (6)
Fair Value 329,904 62,202
Unrealized losses $ (3,360) $ (574)
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, Securities in Unrealized Loss Positions, Number of Holdings | security 42 9
Fair Value - Less Than 12 Months $ 211,308 $ 39,107
Unrealized Losses - Less Than 12 Months (3,665) (135)
Fair Value - 12 Months of More 4,063 0
Unrealized Losses - 12 Months or More (59) 0
Fair Value 215,371 39,107
Unrealized losses $ (3,724) $ (135)
Subordinated corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, Securities in Unrealized Loss Positions, Number of Holdings | security 2 5
Fair Value - Less Than 12 Months $ 1,982 $ 4,902
Unrealized Losses - Less Than 12 Months (18) (98)
Fair Value - 12 Months of More 0 0
Unrealized Losses - 12 Months or More 0 0
Fair Value 1,982 4,902
Unrealized losses $ (18) $ (98)
Obligations of U.S. government sponsored enterprises    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, Securities in Unrealized Loss Positions, Number of Holdings | security 3  
Fair Value - Less Than 12 Months $ 6,081  
Unrealized Losses - Less Than 12 Months (119)  
Fair Value - 12 Months of More 0  
Unrealized Losses - 12 Months or More 0  
Fair Value 6,081  
Unrealized losses $ (119)