Loans and Allowance for Loan Losses - Average Recorded Investment and Interest Income (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
With no related allowance recorded:
With no related allowance recorded, Average Recorded Investment	$ 2,542	$ 1,825
With no related allowance recorded, Interest Recognized For The Period Ended	0	3
With an allowance recorded:
With an allowance recorded, Average Recorded Investment	6,614	8,402
With an allowance recorded, Interest Recognized For The Period Ended	46	55
Total average recorded investment	9,156	10,227
Total interest income recognized For the Period Ended	46	58
Commercial, financial, and agricultural
With no related allowance recorded:
With no related allowance recorded, Average Recorded Investment	1,330	906
With no related allowance recorded, Interest Recognized For The Period Ended	0	0
With an allowance recorded:
With an allowance recorded, Average Recorded Investment	1,276	1,857
With an allowance recorded, Interest Recognized For The Period Ended	11	8
Residential real estate
With no related allowance recorded:
With no related allowance recorded, Average Recorded Investment	850	919
With no related allowance recorded, Interest Recognized For The Period Ended	0	3
With an allowance recorded:
With an allowance recorded, Average Recorded Investment	4,160	4,379
With an allowance recorded, Interest Recognized For The Period Ended	25	32
Residential real estate \| Construction
With an allowance recorded:
With an allowance recorded, Average Recorded Investment	0	15
With an allowance recorded, Interest Recognized For The Period Ended	0	0
Commercial real estate
With no related allowance recorded:
With no related allowance recorded, Average Recorded Investment	170	0
With no related allowance recorded, Interest Recognized For The Period Ended	0	0
With an allowance recorded:
With an allowance recorded, Average Recorded Investment	946	2,012
With an allowance recorded, Interest Recognized For The Period Ended	9	15
Commercial real estate \| Construction
With no related allowance recorded:
With no related allowance recorded, Average Recorded Investment	158	0
With no related allowance recorded, Interest Recognized For The Period Ended	0	0
Installment and other consumer
With no related allowance recorded:
With no related allowance recorded, Average Recorded Investment	34	0
With no related allowance recorded, Interest Recognized For The Period Ended	0	0
With an allowance recorded:
With an allowance recorded, Average Recorded Investment	232	139
With an allowance recorded, Interest Recognized For The Period Ended	$ 1	$ 0

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+ References

No definition available.

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- Definition

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524

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- Definition

Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

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Amount of average investment of impaired financing receivables for which there is no related allowance for credit losses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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Amount of interest income, recognized on accrual basis, on financing receivables that are recognized as impaired, for which there is no related allowance for credit losses.

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