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INVESTMENTS (Schedule of Unrealized Gross Losses and Estimated Fair values of Investment Securities) (Details)
$ in Thousands
Jun. 30, 2020
USD ($)
security
Dec. 31, 2019
USD ($)
security
Debt Securities, Available-for-sale [Line Items]    
Fair Value - Less Than 12 Months $ 48,996 $ 259,972
Unrealized Losses - Less Than 12 Months (373) (2,911)
Fair Value - 12 Months of More 1,602 132,247
Unrealized Losses - 12 Months or More (15) (2,500)
Fair Value 50,598 392,219
Unrealized losses $ (388) $ (5,411)
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security 19 105
Obligations of states and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Fair Value - Less Than 12 Months $ 8,249 $ 30,459
Unrealized Losses - Less Than 12 Months (193) (328)
Fair Value - 12 Months of More 0 0
Unrealized Losses - 12 Months or More 0 0
Fair Value 8,249 30,459
Unrealized losses $ (193) $ (328)
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security 4 11
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises    
Debt Securities, Available-for-sale [Line Items]    
Fair Value - Less Than 12 Months $ 16,635 $ 162,964
Unrealized Losses - Less Than 12 Months (27) (1,850)
Fair Value - 12 Months of More 1,602 63,633
Unrealized Losses - 12 Months or More (15) (755)
Fair Value 18,237 226,597
Unrealized losses $ (42) $ (2,605)
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security 8 59
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises    
Debt Securities, Available-for-sale [Line Items]    
Fair Value - Less Than 12 Months $ 22,156 $ 66,549
Unrealized Losses - Less Than 12 Months (109) (733)
Fair Value - 12 Months of More 0 68,614
Unrealized Losses - 12 Months or More 0 (1,745)
Fair Value 22,156 135,163
Unrealized losses $ (109) $ (2,478)
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security 5 35
Subordinated corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Fair Value - Less Than 12 Months $ 1,956  
Unrealized Losses - Less Than 12 Months (44)  
Fair Value - 12 Months of More 0  
Unrealized Losses - 12 Months or More 0  
Fair Value 1,956  
Unrealized losses $ (44)  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security 2