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INVESTMENTS (Schedule of Unrealized Gross Losses and Estimated Fair values of Investment Securities) (Details)
$ in Thousands
Mar. 31, 2020
USD ($)
security
Dec. 31, 2019
USD ($)
security
Debt Securities, Available-for-sale [Line Items]    
Fair Value - Less Than 12 Months $ 37,760 $ 259,972
Unrealized Losses - Less Than 12 Months (458) (2,911)
Fair Value - 12 Months of More 1,638 132,247
Unrealized Losses - 12 Months or More (43) (2,500)
Fair Value 39,398 392,219
Unrealized losses $ (501) $ (5,411)
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security 406 105
Obligations of states and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Fair Value - Less Than 12 Months $ 20,029 $ 30,459
Unrealized Losses - Less Than 12 Months (337) (328)
Fair Value - 12 Months of More 0 0
Unrealized Losses - 12 Months or More 0 0
Fair Value 20,029 30,459
Unrealized losses $ (337) $ (328)
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security 168 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 $ 7,626 $ 162,964
Unrealized Losses - Less Than 12 Months (34) (1,850)
Fair Value - 12 Months of More 1,638 63,633
Unrealized Losses - 12 Months or More (43) (755)
Fair Value 9,264 226,597
Unrealized losses $ (77) $ (2,605)
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security 144 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 $ 5,180 $ 66,549
Unrealized Losses - Less Than 12 Months (12) (733)
Fair Value - 12 Months of More 0 68,614
Unrealized Losses - 12 Months or More 0 (1,745)
Fair Value 5,180 135,163
Unrealized losses $ (12) $ (2,478)
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security 86 35
Subordinated corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Fair Value - Less Than 12 Months $ 4,925  
Unrealized Losses - Less Than 12 Months (75)  
Fair Value - 12 Months of More 0  
Unrealized Losses - 12 Months or More 0  
Fair Value 4,925  
Unrealized losses $ (75)  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security 8