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Loans and Allowance for Loan Losses (Details 4) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	$ 2,989	$ 2,433
Unpaid Principal Balance, With no related allowance recorded	3,420	2,528
Recorded Investment, With an allowance recorded	6,316	7,923
Unpaid Principal Balance, With an allowance recorded	6,581	8,370
Specific Reserves, With an allowance recorded	1,225	1,333
Total impaired loans, Recorded Investment	9,305	10,356
Total impaired loans, Unpaid Principal Balance	10,001	10,898
Commercial, financial, and agricultural
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	1,570	1,393
Unpaid Principal Balance, With no related allowance recorded	1,910	1,445
Recorded Investment, With an allowance recorded	1,161	1,614
Unpaid Principal Balance, With an allowance recorded	1,229	1,834
Specific Reserves, With an allowance recorded	381	500
Residential Real Estate
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	1,142	674
Unpaid Principal Balance, With no related allowance recorded	1,206	688
Recorded Investment, With an allowance recorded	909	4,398
Unpaid Principal Balance, With an allowance recorded	994	4,500
Specific Reserves, With an allowance recorded	166	521
Real estate - commercial
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	119	366
Unpaid Principal Balance, With no related allowance recorded	121	395
Recorded Investment, With an allowance recorded	243	1,638
Unpaid Principal Balance, With an allowance recorded	269	1,743
Specific Reserves, With an allowance recorded	21	243
Real estate - commercial | Construction
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	158
Unpaid Principal Balance, With no related allowance recorded	183
Recorded Investment, With an allowance recorded	4,003	97
Unpaid Principal Balance, With an allowance recorded	4,089	97
Specific Reserves, With an allowance recorded	$ 657	48
Consumer
Financing Receivable, Impaired [Line Items]
Recorded Investment, With an allowance recorded		176
Unpaid Principal Balance, With an allowance recorded		196
Specific Reserves, With an allowance recorded		$ 21

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