Loans - Average Recorded Investment - Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Credit Quality and Related Allowance for Loan Losses
Average Investment in Impaired Loans	$ 15,395	$ 18,167	$ 16,302	$ 18,087
Interest Income Recognized on an Accrual Basis on Impaired Loans	108	98	216	186
Interest Income Recognized on a Cash Basis on Impaired Loans	29	55	108	99
Commercial, financial, and agricultural
Credit Quality and Related Allowance for Loan Losses
Average Investment in Impaired Loans	513	1,064	498	1,080
Interest Income Recognized on an Accrual Basis on Impaired Loans	4	5	8	10
Interest Income Recognized on a Cash Basis on Impaired Loans	0	3	4	10
Residential
Credit Quality and Related Allowance for Loan Losses
Average Investment in Impaired Loans	2,985	1,922	3,208	1,741
Interest Income Recognized on an Accrual Basis on Impaired Loans	22	16	44	28
Interest Income Recognized on a Cash Basis on Impaired Loans	13	12	22	17
Commercial
Credit Quality and Related Allowance for Loan Losses
Average Investment in Impaired Loans	11,724	14,271	12,410	14,486
Interest Income Recognized on an Accrual Basis on Impaired Loans	82	77	164	148
Interest Income Recognized on a Cash Basis on Impaired Loans	16	11	82	36
Construction
Credit Quality and Related Allowance for Loan Losses
Average Investment in Impaired Loans	173	910	186	780
Interest Income Recognized on an Accrual Basis on Impaired Loans	0	0	0	0
Interest Income Recognized on a Cash Basis on Impaired Loans		$ 29		$ 36

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5258-111524

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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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