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LOANS - IMPAIRED LOANS AND EFFECT ON INTEREST INCOME (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Impaired Loans        
Number of days past due to be considered as nonperforming loans 90 days      
Recorded investment        
With no valuation reserve $ 5,793   $ 6,093  
With a valuation reserve 6,477   2,725  
Total 12,270   8,818  
Unpaid Principal Balance 16,221   18,312  
Related Allowance for Loan Losses 1,263   826  
Average investment        
Average Balance for the Period 11,652 $ 7,436 8,707 $ 5,137
Interest Income Recognized During Impairment        
Interest Income Recognized for the Period 424 371 656 281
Commercial real estate        
Recorded investment        
With no valuation reserve 2,189   2,777  
With a valuation reserve 2,474   2,148  
Total 4,663   4,925  
Unpaid Principal Balance 8,903   10,740  
Related Allowance for Loan Losses 490   486  
Average investment        
Average Balance for the Period 7,225 4,937 5,024 2,784
Interest Income Recognized During Impairment        
Interest Income Recognized for the Period 224 265 410 141
Commercial, financial, and agricultural        
Recorded investment        
With no valuation reserve 2,207   1,460  
With a valuation reserve 3,642   577  
Total 5,849   2,037  
Unpaid Principal Balance 3,819   2,249  
Related Allowance for Loan Losses 773   340  
Average investment        
Average Balance for the Period 379 768 374 246
Interest Income Recognized During Impairment        
Interest Income Recognized for the Period 1 2 26 1
Commercial construction        
Recorded investment        
With no valuation reserve 377   366  
With a valuation reserve 361      
Total 738   366  
Unpaid Principal Balance 374   1,132  
Average investment        
Average Balance for the Period 390 185 383  
Interest Income Recognized During Impairment        
Interest Income Recognized for the Period     13 3
One to four family residential real estate        
Recorded investment        
With no valuation reserve 991   1,231  
Total 991   1,231  
Unpaid Principal Balance 3,085   4,136  
Average investment        
Average Balance for the Period 3,611 1,499 2,879 2,057
Interest Income Recognized During Impairment        
Interest Income Recognized for the Period 198 100 203 134
Consumer construction        
Recorded investment        
With no valuation reserve     217  
Total     217  
Average investment        
Average Balance for the Period   9 9 37
Interest Income Recognized During Impairment        
Interest Income Recognized for the Period   3    
Consumer        
Recorded investment        
With no valuation reserve 29   42  
Total 29   42  
Unpaid Principal Balance 40   55  
Average investment        
Average Balance for the Period 47 38 38 13
Interest Income Recognized During Impairment        
Interest Income Recognized for the Period $ 1 $ 1 $ 4 $ 2