INVESTMENTS - Schedule of Held To Maturity Credit Quality Indicator (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Investment securities held-to-maturity, net	$ 134,055	$ 133,601
State and political subdivisions
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Investment securities held-to-maturity, net	133,554	$ 131,600
State and political subdivisions | AA-rated or higher
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Investment securities held-to-maturity, net	133,129
State and political subdivisions | BBB-
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Investment securities held-to-maturity, net	425
Foreign bonds
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Investment securities held-to-maturity, net	501
Foreign bonds | AA-rated or higher
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Investment securities held-to-maturity, net	501
Foreign bonds | BBB-
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Investment securities held-to-maturity, net	$ 0