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INVESTMENTS (Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity) (Details)
$ in Thousands
Sep. 30, 2019
USD ($)
Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]  
One year or less $ 24,715
Over one through five years 152,917
Over five through ten years 139,570
Over ten years 135,496
Amortized cost 452,698
Available-for-sale Securities, Debt maturities, Fair value:  
One year or less 24,761
Over one through five years 157,160
Over five through ten years 146,237
Over ten years 139,972
Fair value 468,130
Held-to-maturity Securities, Debt maturities, Amortized cost [Abstract]  
One year or less 206
Over one through five years 3,983
Over five through ten years 69
Over ten years 111
Amortized cost 4,369
Held-to-maturity Securities, Debt Maturities, Fair value:  
One year or less 207
Over one through five years 3,960
Over five through ten years 71
Over ten years 111
Fair value 4,349
Total Investments  
Amortized cost 457,067
Fair value $ 472,479