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OTHER BORROWINGS - Schedule of Other Borrowings (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Other Borrowings [Line Items]    
Subordinated deferrable interest debentures $ 125,830 $ 124,345
Other borrowings 425,375 425,155
Fixed Rate Advance due March 3, 2025; fixed interest rate of 1.208%    
Other Borrowings [Line Items]    
Advance from correspondent bank $ 15,000 15,000
Debt instrument, interest rate, effective percentage 1.208%  
Fixed Rate Advance due March 2, 2027; fixed interest rate of 1.445%    
Other Borrowings [Line Items]    
Advance from correspondent bank $ 15,000 15,000
Debt instrument, interest rate, effective percentage 1.445%  
Fixed Rate Advance due March 4, 2030; fixed interest rate of 1.606%    
Other Borrowings [Line Items]    
Advance from correspondent bank $ 15,000 15,000
Debt instrument, interest rate, effective percentage 1.606%  
Fixed Rate Advance due December 9, 2030; fixed interest rate of 4.55%    
Other Borrowings [Line Items]    
Advance from correspondent bank $ 1,403 1,411
Debt instrument, interest rate, effective percentage 4.55%  
Fixed Rate Advance due December 9, 2030; fixed interest rate of 4.55%    
Other Borrowings [Line Items]    
Advance from correspondent bank $ 971 977
Debt instrument, interest rate, effective percentage 4.55%  
Principal Reducing Advance due September 29, 2031; fixed interest rate of 3.095%    
Other Borrowings [Line Items]    
Advance from correspondent bank $ 1,457 1,567
Debt instrument, interest rate, effective percentage 3.095%  
Subordinated notes payable due March 15, 2027 net of unamortized debt issuance cost of $714 and $812, respectively; fixed interest rate of 5.75% through March 14, 2022; variable interest rate thereafter at three-month LIBOR plus 3.616%    
Other Borrowings [Line Items]    
Subordinated deferrable interest debentures $ 74,286 74,188
Debt instrument, interest rate, effective percentage 5.75%  
Unamortized debt issuance expense $ 714 812
Subordinated notes payable due March 15, 2027 net of unamortized debt issuance cost of $714 and $812, respectively; fixed interest rate of 5.75% through March 14, 2022; variable interest rate thereafter at three-month LIBOR plus 3.616% | London Interbank Offered Rate (LIBOR)    
Other Borrowings [Line Items]    
Basis spread on variable rate 3.616%  
Subordinated notes payable due December 15, 2029 net of unamortized debt issuance cost of $1,983 and $2,165, respectively; fixed interest rate of 4.25% through December 14, 2024; variable interest rate thereafter at three-month SOFR plus 2.94%    
Other Borrowings [Line Items]    
Subordinated deferrable interest debentures $ 118,017 117,835
Debt instrument, interest rate, effective percentage 4.25%  
Unamortized debt issuance expense $ 1,983 2,165
Subordinated notes payable due December 15, 2029 net of unamortized debt issuance cost of $1,983 and $2,165, respectively; fixed interest rate of 4.25% through December 14, 2024; variable interest rate thereafter at three-month SOFR plus 2.94% | Secured Overnight Financing Rate (SOFR)    
Other Borrowings [Line Items]    
Basis spread on variable rate 2.94%  
Subordinated notes payable due May 31, 2030 net of unaccreted purchase accounting fair value adjustment of $1,058 and $1,150, respectively; fixed interest rate of 5.875% through May 31, 2025; variable interest rate thereafter at three-month LIBOR plus 3.63%    
Other Borrowings [Line Items]    
Subordinated deferrable interest debentures $ 76,058 76,150
Debt instrument, interest rate, effective percentage 5.875%  
Unaccreted purchase accounting fair value adjustment $ (1,058) (1,150)
Subordinated notes payable due May 31, 2030 net of unaccreted purchase accounting fair value adjustment of $1,058 and $1,150, respectively; fixed interest rate of 5.875% through May 31, 2025; variable interest rate thereafter at three-month LIBOR plus 3.63% | London Interbank Offered Rate (LIBOR)    
Other Borrowings [Line Items]    
Basis spread on variable rate 3.63%  
Subordinated notes payable due October 1, 2030 net of unamortized debt issuance cost of $1,817 and $1,973, respectively; fixed interest rate of 3.875% through September 30, 2025; variable interest rate thereafter at three-month SOFR plus 3.753%    
Other Borrowings [Line Items]    
Subordinated deferrable interest debentures $ 108,183 108,027
Debt instrument, interest rate, effective percentage 3.875%  
Unamortized debt issuance expense $ 1,817 $ 1,973
Subordinated notes payable due October 1, 2030 net of unamortized debt issuance cost of $1,817 and $1,973, respectively; fixed interest rate of 3.875% through September 30, 2025; variable interest rate thereafter at three-month SOFR plus 3.753% | Secured Overnight Financing Rate (SOFR)    
Other Borrowings [Line Items]    
Basis spread on variable rate 3.753%