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FAIR VALUE - (Financial Instruments Measured at Fair Value) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]      
Debt securities, available for sale, at fair value $ 428,641 $ 423,238  
Equity securities, available-for-sale, at fair value 17,758 15,434  
Total investments 446,399 438,672  
Fair value transfers 0   $ 0
United States Government Obligations and Authorities [Member]      
Investments, Debt and Equity Securities [Abstract]      
Debt securities, available for sale, at fair value 127,868 98,137  
Total investments 127,868 98,137  
Held-to-maturity securities, fair Value 3,928 4,063  
Obligations of States and Political Subdivisions [Member]      
Investments, Debt and Equity Securities [Abstract]      
Debt securities, available for sale, at fair value 9,767 66,266  
Total investments 9,767 66,266  
Corporate [Member]      
Investments, Debt and Equity Securities [Abstract]      
Debt securities, available for sale, at fair value 268,731 240,919  
Total investments 268,731 240,919  
Held-to-maturity securities, fair Value 982 1,144  
International [Member]      
Investments, Debt and Equity Securities [Abstract]      
Debt securities, available for sale, at fair value 22,275 17,916  
Total investments 22,275 17,916  
Held-to-maturity securities, fair Value 54 67  
Level 1 [Member]      
Investments, Debt and Equity Securities [Abstract]      
Debt securities, available for sale, at fair value 43,918 51,219  
Equity securities, available-for-sale, at fair value 16,037 15,434  
Total investments 59,955 66,653  
Fair value transfers   0  
Level 1 [Member] | United States Government Obligations and Authorities [Member]      
Investments, Debt and Equity Securities [Abstract]      
Debt securities, available for sale, at fair value 43,918 51,219  
Level 2 [Member]      
Investments, Debt and Equity Securities [Abstract]      
Debt securities, available for sale, at fair value 384,723 372,019  
Equity securities, available-for-sale, at fair value 1,721 0  
Total investments 386,444 372,019  
Level 2 [Member] | United States Government Obligations and Authorities [Member]      
Investments, Debt and Equity Securities [Abstract]      
Debt securities, available for sale, at fair value 83,950 46,918  
Level 2 [Member] | Obligations of States and Political Subdivisions [Member]      
Investments, Debt and Equity Securities [Abstract]      
Debt securities, available for sale, at fair value 9,767 66,266  
Level 2 [Member] | Corporate [Member]      
Investments, Debt and Equity Securities [Abstract]      
Debt securities, available for sale, at fair value 268,731 240,919  
Level 2 [Member] | International [Member]      
Investments, Debt and Equity Securities [Abstract]      
Debt securities, available for sale, at fair value $ 22,275 $ 17,916