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SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Summary of securities sold under agreements to repurchase [Abstract]      
Securities sold under agreements to repurchase $ 0 $ 10,000 $ 27,606
Maximum month-end balance 10,000 25,718 30,497
Average balance during year $ 3,644 $ 14,207 $ 29,120
Weighted-average interest rate at December 31 0.00% 3.72% 3.02%
Average interest rate paid during year 3.77% 3.37% 2.92%
Mortgage-backed securities, residential   $ 11,798  
Excess collateral held   (1,798)  
Securities sold under agreements to repurchase $ 0 10,000 $ 27,606
Overnight and Continuous      
Summary of securities sold under agreements to repurchase [Abstract]      
Securities sold under agreements to repurchase   0  
Excess collateral held   0  
Securities sold under agreements to repurchase   0  
Up to 1 Year      
Summary of securities sold under agreements to repurchase [Abstract]      
Securities sold under agreements to repurchase   10,000  
Excess collateral held   (1,798)  
Securities sold under agreements to repurchase   10,000  
1 - 3 Years      
Summary of securities sold under agreements to repurchase [Abstract]      
Securities sold under agreements to repurchase   0  
Excess collateral held   0  
Securities sold under agreements to repurchase   0  
3 Years      
Summary of securities sold under agreements to repurchase [Abstract]      
Securities sold under agreements to repurchase   0  
Excess collateral held   0  
Securities sold under agreements to repurchase   0  
Mortgage-backed securities, residential | Overnight and Continuous      
Summary of securities sold under agreements to repurchase [Abstract]      
Mortgage-backed securities, residential   0  
Mortgage-backed securities, residential | Up to 1 Year      
Summary of securities sold under agreements to repurchase [Abstract]      
Mortgage-backed securities, residential   11,798  
Mortgage-backed securities, residential | 1 - 3 Years      
Summary of securities sold under agreements to repurchase [Abstract]      
Mortgage-backed securities, residential   0  
Mortgage-backed securities, residential | 3 Years      
Summary of securities sold under agreements to repurchase [Abstract]      
Mortgage-backed securities, residential   $ 0