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LOAN CREDIT QUALITY AND RELATED ALLOWANCE FOR LOAN LOSSES - Recorded Investment, Unpaid Principal Balance, and Related Allowance of Impaired Loans by Segment (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Credit Quality and Related Allowance for Loan Losses    
Recorded investment, with no related allowance recorded $ 3,926 $ 3,526
Unpaid principal balance, with no related allowance recorded 3,926 3,526
Recorded investment, with an allowance recorded 10,520 12,450
Unpaid principal balance, with an allowance recorded 10,619 12,545
Recorded Investment 14,446 15,976
Unpaid Principal Balance 14,545 16,071
Related Allowance 2,184 2,179
Commercial, Financial, and Agricultural    
Credit Quality and Related Allowance for Loan Losses    
Recorded investment, with no related allowance recorded 1,033 109
Unpaid principal balance, with no related allowance recorded 1,033 109
Recorded investment, with an allowance recorded 235 132
Unpaid principal balance, with an allowance recorded 235 132
Recorded Investment 1,268 241
Unpaid Principal Balance 1,268 241
Related Allowance 96 74
Residential Real Estate Mortgage    
Credit Quality and Related Allowance for Loan Losses    
Recorded investment, with no related allowance recorded 1,428 1,584
Unpaid principal balance, with no related allowance recorded 1,428 1,584
Recorded investment, with an allowance recorded 2,304 1,893
Unpaid principal balance, with an allowance recorded 2,353 1,893
Recorded Investment 3,732 3,477
Unpaid Principal Balance 3,781 3,477
Related Allowance 367 437
Commercial Real Estate Mortgage    
Credit Quality and Related Allowance for Loan Losses    
Recorded investment, with no related allowance recorded 1,465 1,833
Unpaid principal balance, with no related allowance recorded 1,465 1,833
Recorded investment, with an allowance recorded 7,981 10,425
Unpaid principal balance, with an allowance recorded 8,031 10,520
Recorded Investment 9,446 12,258
Unpaid Principal Balance 9,496 12,353
Related Allowance 1,721 1,668
Construction Real Estate Mortgage    
Credit Quality and Related Allowance for Loan Losses    
Recorded investment, with no related allowance recorded 0 0
Unpaid principal balance, with no related allowance recorded 0 0
Recorded investment, with an allowance recorded 0 0
Unpaid principal balance, with an allowance recorded 0 0
Recorded Investment 0 0
Unpaid Principal Balance 0 0
Related Allowance $ 0 $ 0