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INVESTMENTS - (Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity) (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Available-for-sale Securities, Debt maturities, Amortized cost:  
One year or less $ 22,642
Over one through five years 210,100
Over five through ten years 135,374
Over ten years 144,529
Amortized cost 512,645
Available-for-sale Securities, Debt maturities, Fair value:  
One year or less 22,703
Over one through five years 214,405
Over five through ten years 141,094
Over ten years 148,063
Amortized cost 526,265
Held-to-maturity Securities, Debt maturities, Amortized cost [Abstract]  
One year or less 330
Over one through five years 3,833
Over five through ten years 69
Over ten years 105
Amortized cost 4,337
Held-to-maturity Securities, Debt Maturities, Fair value:  
One year or less 331
Over one through five years 3,824
Over five through ten years 71
Over ten years 105
Estimated fair value 4,331
Total Investments [Abstract]  
Amortized cost 516,982
Estimated fair value $ 530,596