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INVESTMENTS - (Summary of Amortized Cost and Fair Value of Debt and Equity Securities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]    
Debt securities, available-for-sale, at amortized cost $ 512,645 $ 433,664
Debt securities, at fair value 526,265 428,641
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities, Amortized Cost or Cost 4,337 5,126
Total investments, Amortized Cost or Cost 516,982 438,790
Investments, Accumulated Unrealized Gain 14,245 1,643
Investments, Accumulated Unrealized Loss 631 6,828
Total investments, Fair Value 530,596 433,605
United States Government Obligations and Authorities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Debt securities, available-for-sale, at amortized cost 191,546 127,928
Debt securities, available-for-sale, Gross Unrealized Gains 3,073 1,091
Debt securities, available-for-sale, Gross Unrealized Losses 426 1,151
Debt securities, at fair value 194,193 127,868
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities, Amortized Cost or Cost 3,585 4,085
Held-to-maturity securities, Gross Unrealized Gains 12 1
Held-to-maturity securities, Gross Unrealized Losses 39 158
Held-to-maturity securities, fair Value 3,558 3,928
Obligations of States and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Debt securities, available-for-sale, at amortized cost 23,748 9,870
Debt securities, available-for-sale, Gross Unrealized Gains 294 27
Debt securities, available-for-sale, Gross Unrealized Losses 22 130
Debt securities, at fair value 24,020 9,767
Corporate [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Debt securities, available-for-sale, at amortized cost 268,182 273,192
Debt securities, available-for-sale, Gross Unrealized Gains 10,252 510
Debt securities, available-for-sale, Gross Unrealized Losses 132 4,971
Debt securities, at fair value 278,302 268,731
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities, Amortized Cost or Cost 697 986
Held-to-maturity securities, Gross Unrealized Gains 20 2
Held-to-maturity securities, Gross Unrealized Losses 0 6
Held-to-maturity securities, fair Value 717 982
International [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Debt securities, available-for-sale, at amortized cost 29,169 22,674
Debt securities, available-for-sale, Gross Unrealized Gains 593 12
Debt securities, available-for-sale, Gross Unrealized Losses 12 411
Debt securities, at fair value 29,750 22,275
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities, Amortized Cost or Cost 55 55
Held-to-maturity securities, Gross Unrealized Gains 1 0
Held-to-maturity securities, Gross Unrealized Losses 0 1
Held-to-maturity securities, fair Value 56 54
Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Debt securities, available-for-sale, at amortized cost 512,645 433,664
Debt securities, available-for-sale, Gross Unrealized Gains 14,212 1,640
Debt securities, available-for-sale, Gross Unrealized Losses 592 6,663
Debt securities, at fair value 526,265 428,641
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities, Amortized Cost or Cost 4,337 5,126
Held-to-maturity securities, Gross Unrealized Gains 33 3
Held-to-maturity securities, Gross Unrealized Losses 39 165
Held-to-maturity securities, fair Value $ 4,331 $ 4,964