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OTHER BORROWINGS - Schedule of Other Borrowings (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Net carrying value of subordinated debt $ 89,187 $ 85,550
Other borrowings 151,774 $ 250,554
Daily Rate Credit with a variable interest rate (1.59% at December 31, 2017)    
Debt Instrument [Line Items]    
Effective interest rate   1.59%
Advance from correspondent bank $ 0 $ 25,000
Convertible Flipper Advance due May 22, 2019; current interest rate of 4.68%    
Debt Instrument [Line Items]    
Effective interest rate 4.68%  
Advance from correspondent bank $ 1,514 0
Principal Reducing Advance due June 20, 2019; fixed interest rate of 1.274%    
Debt Instrument [Line Items]    
Effective interest rate 1.274%  
Advance from correspondent bank $ 500 0
Fixed Rate Advance due December 9, 2030; fixed interest rate of 4.55%    
Debt Instrument [Line Items]    
Effective interest rate 4.55%  
Advance from correspondent bank $ 1,434 0
Fixed Rate Advance due December 9, 2030; fixed interest rate of 4.55%    
Debt Instrument [Line Items]    
Effective interest rate 4.55%  
Advance from correspondent bank $ 993 0
Principal Reducing Advance due September 29, 2031; fixed interest rate of 3.095%    
Debt Instrument [Line Items]    
Effective interest rate 3.095%  
Advance from correspondent bank $ 1,858 $ 0
Fixed Rate Advance due January 8, 2018; fixed interest rate of 1.39%    
Debt Instrument [Line Items]    
Effective interest rate   1.39%
Advance from correspondent bank $ 0 $ 150,000
Subordinated notes payable due March 15, 2027 net of unamortized debt issuance cost of $1,074 and $1,205, respectively; fixed interest rate of 5.75% through March 14, 2022; variable interest rate thereafter at three-month LIBOR plus 3.616%    
Debt Instrument [Line Items]    
Effective interest rate 5.75%  
Unamortized debt issuance expense $ 1,074 1,205
Net carrying value of subordinated debt $ 73,926 73,795
Advance from correspondent bank due October 5, 2019; fixed interest rate of 4.25%    
Debt Instrument [Line Items]    
Effective interest rate 4.25%  
Other borrowings $ 20 49
Advance from correspondent bank due September 5, 2026; secured by a loan receivable; fixed interest rate of 2.09%    
Debt Instrument [Line Items]    
Other borrowings $ 1,529 1,710
Advances under revolving credit agreement with a regional bank due September 26, 2020; secured by subsidiary bank stock; variable interest rate at 90-day LIBOR plus 3.50% (6.24% at December 31, 2018)    
Debt Instrument [Line Items]    
Basis spread on variable rate 3.50%  
Long-term line of credit $ 70,000 $ 0
London Interbank Offered Rate (LIBOR)    
Debt Instrument [Line Items]    
Basis spread on variable rate 3.50%  
London Interbank Offered Rate (LIBOR) | Subordinated notes payable due March 15, 2027 net of unamortized debt issuance cost of $1,074 and $1,205, respectively; fixed interest rate of 5.75% through March 14, 2022; variable interest rate thereafter at three-month LIBOR plus 3.616%    
Debt Instrument [Line Items]    
Basis spread on variable rate 3.616%