Loans and Leases - Nonperforming Loans and Leases (Details) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($) borrowers
Nonperforming Loans and Leases [Line Items]
Impaired loans with no related reserve, Recorded Investment	$ 15,313		$ 15,313		$ 27,454
Nonaccrual Loans and Leases	27,559		27,559		14,517
Accruing Troubled Debt Restructured Loans And Lease Modifications	766		766		11,435
Loans and Leases 90 Days or more Past Due and Accruing Interest	1,224		1,224		761
Total Nonperforming Loans and Leases	29,549		29,549		26,713
Nonaccrual Troubled Debt Restructured Loans And Lease Modifications	1,300		1,300		$ 2,500
Number of Borrowers \| borrowers					1
Impaired Financing Receivable, Related Reserve	1,048		1,048		$ 131
Commercial, Financial and Agricultural [Member]
Nonperforming Loans and Leases [Line Items]
Impaired loans with no related reserve, Recorded Investment	3,958		3,958		7,019
Nonaccrual Loans and Leases	2,795		2,795		4,448
Accruing Troubled Debt Restructured Loans And Lease Modifications	595		595		921
Loans and Leases 90 Days or more Past Due and Accruing Interest	0		0		0
Total Nonperforming Loans and Leases	3,390		3,390		5,369
Impaired Financing Receivable, Related Reserve	211		211		31
Real Estate-Commercial [Member]
Nonperforming Loans and Leases [Line Items]
Impaired loans with no related reserve, Recorded Investment	7,110		7,110		15,621
Nonaccrual Loans and Leases	18,425		18,425		4,285
Accruing Troubled Debt Restructured Loans And Lease Modifications	0		0		10,266
Loans and Leases 90 Days or more Past Due and Accruing Interest	83		83		0
Total Nonperforming Loans and Leases	18,508		18,508		14,551
Impaired Financing Receivable, Related Reserve	645		645		99
Real Estate-Construction [Member]
Nonperforming Loans and Leases [Line Items]
Impaired loans with no related reserve, Recorded Investment	106		106		365
Nonaccrual Loans and Leases	106		106		365
Accruing Troubled Debt Restructured Loans And Lease Modifications	0		0		0
Loans and Leases 90 Days or more Past Due and Accruing Interest	0		0		0
Total Nonperforming Loans and Leases	106		106		365
Impaired Financing Receivable, Related Reserve	0		0		0
Real Estate-Residential Secured for Business Purpose [Member]
Nonperforming Loans and Leases [Line Items]
Impaired loans with no related reserve, Recorded Investment	1,588		1,588		3,430
Nonaccrual Loans and Leases	1,416		1,416		2,843
Accruing Troubled Debt Restructured Loans And Lease Modifications	171		171		206
Loans and Leases 90 Days or more Past Due and Accruing Interest	0		0		162
Total Nonperforming Loans and Leases	1,587		1,587		3,211
Impaired Financing Receivable, Related Reserve	0		0		1
Real Estate-Residential Secured for Personal Purpose [Member]
Nonperforming Loans and Leases [Line Items]
Impaired loans with no related reserve, Recorded Investment	1,091		1,091		508
Nonaccrual Loans and Leases	1,815		1,815		466
Accruing Troubled Debt Restructured Loans And Lease Modifications	0		0		42
Loans and Leases 90 Days or more Past Due and Accruing Interest	0		0		0
Total Nonperforming Loans and Leases	1,815		1,815		508
Impaired Financing Receivable, Related Reserve	192		192		0
Real Estate-Home Equity Secured for Personal Purpose [Member]
Nonperforming Loans and Leases [Line Items]
Impaired loans with no related reserve, Recorded Investment	1,460		1,460		511
Nonaccrual Loans and Leases	1,460		1,460		511
Accruing Troubled Debt Restructured Loans And Lease Modifications	0		0		0
Loans and Leases 90 Days or more Past Due and Accruing Interest	128		128		148
Total Nonperforming Loans and Leases	1,588		1,588		659
Impaired Financing Receivable, Related Reserve	0		0		0
Loans to Individuals [Member]
Nonperforming Loans and Leases [Line Items]
Nonaccrual Loans and Leases	0		0		0
Accruing Troubled Debt Restructured Loans And Lease Modifications	0		0		0
Loans and Leases 90 Days or more Past Due and Accruing Interest	165		165		195
Total Nonperforming Loans and Leases	165		165		195
Lease Financings [Member]
Nonperforming Loans and Leases [Line Items]
Impaired loans with no related reserve, Recorded Investment	1,300		1,300		1,300
Nonaccrual Loans and Leases	1,542		1,542		1,599
Accruing Troubled Debt Restructured Loans And Lease Modifications	0		0		0
Loans and Leases 90 Days or more Past Due and Accruing Interest	848		848		256
Total Nonperforming Loans and Leases	2,390		2,390		1,855
Impaired Financing Receivable, Related Reserve	0		0		0
Accrual Troubled Debt Restructuring Loans [Member]
Nonperforming Loans and Leases [Line Items]
Pre- Restructuring Outstanding Recorded Investment	0	$ 0	0	$ 9,206
Accrual Troubled Debt Restructuring Loans [Member] \| Real Estate-Commercial [Member]
Nonperforming Loans and Leases [Line Items]
Pre- Restructuring Outstanding Recorded Investment			0	$ 9,206
Non-Accrual [Member] \| Real Estate-Commercial [Member]
Nonperforming Loans and Leases [Line Items]
Nonaccrual Loans and Leases	11,800		11,800
Impaired Financing Receivable, Related Reserve	$ 645		$ 645
Amortization Period Extension [Member] \| Accrual Troubled Debt Restructuring Loans [Member]
Nonperforming Loans and Leases [Line Items]
Pre- Restructuring Outstanding Recorded Investment					$ 10,300

Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

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