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FEDERAL HOME LOAN BANK ADVANCES - FHLB ADVANCES (Details) - USD ($)
3 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
FHLB advances        
Total FHLB advances   $ 737,500,000 $ 802,500,000  
FHLB advances payoff $ 50,000,000      
Interest rate (as percent)   1.61%    
FHLB advance prepayment penalty   $ 0 846,000 $ 0
Additional collateralized advances available   347,000,000 378,000,000  
Overnight advance        
FHLB advances        
Total FHLB advances   330,000,000 285,000,000  
Variable interest rate advance indexed to 3-Month LIBOR plus 0.14% due in December 2018        
FHLB advances        
Total FHLB advances   $ 10,000,000 $ 10,000,000  
Variable interest rate advance indexed to 3-Month LIBOR plus 0.14% due in December 2018 | London Interbank Offered Rate (LIBOR)        
FHLB advances        
Interest rate (as percent)   0.14% 0.14%  
Fixed interest rate advances        
FHLB advances        
Total FHLB advances   $ 397,500,000 $ 457,500,000  
Putable fixed interest rate advances        
FHLB advances        
Total FHLB advances     50,000,000  
FHLB advances payoff     50,000,000  
Various other unsecured lines of credit        
FHLB advances        
Unsecured lines of credit   $ 125,000,000 $ 150,000,000