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INVESTMENTS (Schedule of Unrealized Gross Losses and Estimated Fair values of Investment Securities) (Details)
$ in Thousands
Mar. 31, 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 87 30
Fair Value - Less Than 12 Months $ 384,901 $ 107,635
Unrealized Losses - Less Than 12 Months (7,924) (916)
Fair Value - 12 Months of More 2,518 980
Unrealized Losses - 12 Months or More (350) (6)
Fair Value 387,419 108,615
Unrealized losses $ (8,274) $ (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 3 1
Fair Value - Less Than 12 Months $ 2,445 $ 2,404
Unrealized Losses - Less Than 12 Months (116) (115)
Fair Value - 12 Months of More 2,171 0
Unrealized Losses - 12 Months or More (347) 0
Fair Value 4,616 2,404
Unrealized losses $ (463) $ (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 51 15
Fair Value - Less Than 12 Months $ 234,124 $ 61,222
Unrealized Losses - Less Than 12 Months (5,410) (568)
Fair Value - 12 Months of More 347 980
Unrealized Losses - 12 Months or More (3) (6)
Fair Value 234,471 62,202
Unrealized losses $ (5,413) $ (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 30 9
Fair Value - Less Than 12 Months $ 142,364 $ 39,107
Unrealized Losses - Less Than 12 Months (2,166) (135)
Fair Value - 12 Months of More 0 0
Unrealized Losses - 12 Months or More 0 0
Fair Value 142,364 39,107
Unrealized losses $ (2,166) $ (135)
Subordinated corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, Securities in Unrealized Loss Positions, Number of Holdings | security 1 5
Fair Value - Less Than 12 Months $ 985 $ 4,902
Unrealized Losses - Less Than 12 Months (15) (98)
Fair Value - 12 Months of More 0 0
Unrealized Losses - 12 Months or More 0 0
Fair Value 985 4,902
Unrealized losses $ (15) $ (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 2  
Fair Value - Less Than 12 Months $ 4,983  
Unrealized Losses - Less Than 12 Months (217)  
Fair Value - 12 Months of More 0  
Unrealized Losses - 12 Months or More 0  
Fair Value 4,983  
Unrealized losses $ (217)