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Allowance for Loan Losses - Allowance and Loans by Impairment Methodology (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Allowance balance attributable to loans:        
Individually evaluated for impairment $ 462 $ 428    
Collectively evaluated for impairment 32,756 33,595    
Total allowance 33,218 34,023 $ 34,959 $ 35,726
Loans:        
Individually evaluated for impairment 4,715 5,777    
Collectively evaluated for impairment 1,083,245 1,054,508    
Total loans 1,088,538 1,062,120    
Real estate - residential mortgage        
Allowance balance attributable to loans:        
Individually evaluated for impairment 81 92    
Collectively evaluated for impairment 2,054 2,154    
Total allowance 2,135 2,246 2,301 2,371
Loans:        
Individually evaluated for impairment 2,804 2,965    
Collectively evaluated for impairment 177,046 181,652    
Total loans 179,960 184,901    
Real estate - construction        
Allowance balance attributable to loans:        
Collectively evaluated for impairment 804 727    
Total allowance 804 727 779 605
Loans:        
Collectively evaluated for impairment 62,554 54,461    
Total loans 62,554 54,461    
Commercial, financial and agricultural        
Allowance balance attributable to loans:        
Individually evaluated for impairment 75 10    
Collectively evaluated for impairment 6,691 6,678    
Total allowance 6,766 6,688 6,897 7,478
Loans:        
Individually evaluated for impairment 1,571 2,450    
Collectively evaluated for impairment 464,345 452,024    
Total loans 466,349 455,935    
Equity lines        
Allowance balance attributable to loans:        
Individually evaluated for impairment 187 326    
Collectively evaluated for impairment 686 780    
Total allowance 873 1,106 1,138 688
Loans:        
Individually evaluated for impairment 217 357    
Collectively evaluated for impairment 52,159 55,213    
Total loans 52,411 55,660    
Consumer        
Allowance balance attributable to loans:        
Individually evaluated for impairment 119      
Collectively evaluated for impairment 279 257    
Total allowance 398 257 280 231
Loans:        
Individually evaluated for impairment 123 5    
Collectively evaluated for impairment 13,398 15,004    
Total loans 13,521 15,009    
Consumer finance        
Allowance balance attributable to loans:        
Collectively evaluated for impairment 22,242 22,999    
Total allowance 22,242 22,999 $ 23,564 $ 24,353
Loans:        
Collectively evaluated for impairment 313,743 296,154    
Total loans 313,743 296,154    
PCI        
Loans:        
Acquired loans - PCI 578 1,835    
PCI | Real estate - residential mortgage        
Loans:        
Acquired loans - PCI 110 284    
PCI | Commercial, financial and agricultural        
Loans:        
Acquired loans - PCI 433 1,461    
PCI | Equity lines        
Loans:        
Acquired loans - PCI $ 35 $ 90