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INVESTMENTS (Summary of Amortized Cost and Fair Value of Debt and Equity Securities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Schedule of Investments [Line Items]    
Debt securities, available-for-sale, at amortized cost $ 536,896 $ 512,645
Debt securities - available-for-sale, at fair value: 555,961 526,265
Held-to-maturity securities, Amortized Cost or Cost 0 4,337
Held-to-maturity securities, fair value 4,300  
Total investments, Amortized Cost or Cost   516,982
Total investments, Gross Unrealized Gain   14,245
Total investments, Gross Unrealized Loss   631
Total investments, Fair Value   530,596
Debt Securities    
Schedule of Investments [Line Items]    
Debt securities, available-for-sale, at amortized cost 536,896 512,645
Debt securities, available-for-sale securities, Gross Unrealized Gain 19,911 14,212
Debt securities, available-for-sale securities, Gross Unrealized Losses 846 592
Debt securities - available-for-sale, at fair value: 555,961 526,265
Held-to-maturity securities, Amortized Cost or Cost   4,337
Held-to-maturity securities, Gross Unrealized Gains   33
Held-to-maturity securities, Gross Unrealized Losses   39
Held-to-maturity securities, fair value   4,331
United States Government Obligations and Authorities    
Schedule of Investments [Line Items]    
Debt securities, available-for-sale, at amortized cost 192,968 191,546
Debt securities, available-for-sale securities, Gross Unrealized Gain 2,860 3,073
Debt securities, available-for-sale securities, Gross Unrealized Losses 200 426
Debt securities - available-for-sale, at fair value: 195,628 194,193
Held-to-maturity securities, Amortized Cost or Cost   3,585
Held-to-maturity securities, Gross Unrealized Gains   12
Held-to-maturity securities, Gross Unrealized Losses   39
Held-to-maturity securities, fair value   3,558
Obligations of States and Political Subdivisions    
Schedule of Investments [Line Items]    
Debt securities, available-for-sale, at amortized cost 22,414 23,748
Debt securities, available-for-sale securities, Gross Unrealized Gain 799 294
Debt securities, available-for-sale securities, Gross Unrealized Losses 0 22
Debt securities - available-for-sale, at fair value: 23,213 24,020
Corporate    
Schedule of Investments [Line Items]    
Debt securities, available-for-sale, at amortized cost 294,159 268,182
Debt securities, available-for-sale securities, Gross Unrealized Gain 15,163 10,252
Debt securities, available-for-sale securities, Gross Unrealized Losses 585 132
Debt securities - available-for-sale, at fair value: 308,737 278,302
Held-to-maturity securities, Amortized Cost or Cost   697
Held-to-maturity securities, Gross Unrealized Gains   20
Held-to-maturity securities, Gross Unrealized Losses   0
Held-to-maturity securities, fair value   717
International    
Schedule of Investments [Line Items]    
Debt securities, available-for-sale, at amortized cost 27,355 29,169
Debt securities, available-for-sale securities, Gross Unrealized Gain 1,089 593
Debt securities, available-for-sale securities, Gross Unrealized Losses 61 12
Debt securities - available-for-sale, at fair value: $ 28,383 29,750
Held-to-maturity securities, Amortized Cost or Cost   55
Held-to-maturity securities, Gross Unrealized Gains   1
Held-to-maturity securities, Gross Unrealized Losses   0
Held-to-maturity securities, fair value   $ 56