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INVESTMENTS (Schedule of Unrealized Gross Losses and Estimated Fair values of Investment Securities) (Details)
$ in Thousands
Sep. 30, 2020
USD ($)
security
Dec. 31, 2019
USD ($)
security
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, Securities in Unrealized Loss Positions, Number of Holdings | security 26 105
Fair Value - Less Than 12 Months $ 97,865 $ 259,972
Unrealized Losses - Less Than 12 Months (1,121) (2,911)
Fair Value - 12 Months of More 1,004 132,247
Unrealized Losses - 12 Months or More (6) (2,500)
Fair Value 98,869 392,219
Unrealized losses $ (1,127) $ (5,411)
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 1 11
Fair Value - Less Than 12 Months $ 2,441 $ 30,459
Unrealized Losses - Less Than 12 Months (78) (328)
Fair Value - 12 Months of More 0 0
Unrealized Losses - 12 Months or More 0 0
Fair Value 2,441 30,459
Unrealized losses $ (78) $ (328)
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 14 59
Fair Value - Less Than 12 Months $ 59,434 $ 162,964
Unrealized Losses - Less Than 12 Months (858) (1,850)
Fair Value - 12 Months of More 1,004 63,633
Unrealized Losses - 12 Months or More (6) (755)
Fair Value 60,438 226,597
Unrealized losses $ (864) $ (2,605)
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 8 35
Fair Value - Less Than 12 Months $ 33,046 $ 66,549
Unrealized Losses - Less Than 12 Months (129) (733)
Fair Value - 12 Months of More 0 68,614
Unrealized Losses - 12 Months or More 0 (1,745)
Fair Value 33,046 135,163
Unrealized losses $ (129) $ (2,478)
Subordinated corporate bonds    
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 $ 2,944  
Unrealized Losses - Less Than 12 Months (56)  
Fair Value - 12 Months of More 0  
Unrealized Losses - 12 Months or More 0  
Fair Value 2,944  
Unrealized losses $ (56)