INVESTMENTS - Schedule of Held To Maturity Credit Quality Indicator (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Investment securities held-to-maturity, net	$ 113,616	$ 133,601
State and political subdivisions
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Investment securities held-to-maturity, net	113,115	$ 131,600
State and political subdivisions | A+ rated or higher
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Investment securities held-to-maturity, net	112,826
State and political subdivisions | Not rated
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Investment securities held-to-maturity, net	289
Foreign bonds
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Investment securities held-to-maturity, net	501
Foreign bonds | A+ rated or higher
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Investment securities held-to-maturity, net	501
Foreign bonds | Not rated
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Investment securities held-to-maturity, net	$ 0