Loans and Leases - Nonperforming Loans and Leases (Details) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($) borrowers
Nonperforming Loans and Leases [Line Items]
Impaired loans with no related reserve, Recorded Investment	$ 16,953		$ 16,953		$ 27,454
Nonaccrual Loans and Leases	30,148		30,148		14,517
Accruing Troubled Debt Restructured Loans And Lease Modifications	790		790		11,435
Loans and Leases 90 Days or more Past Due and Accruing Interest	150		150		761
Total Nonperforming Loans and Leases	31,088		31,088		26,713
Nonaccrual Troubled Debt Restructured Loans And Lease Modifications	1,800		1,800		$ 2,500
Number of Borrowers \| borrowers					1
Impaired Financing Receivable, Related Reserve	1,524		1,524		$ 131
Commercial, Financial and Agricultural [Member]
Nonperforming Loans and Leases [Line Items]
Impaired loans with no related reserve, Recorded Investment	4,122		4,122		7,019
Nonaccrual Loans and Leases	4,084		4,084		4,448
Accruing Troubled Debt Restructured Loans And Lease Modifications	607		607		921
Loans and Leases 90 Days or more Past Due and Accruing Interest	0		0		0
Total Nonperforming Loans and Leases	4,691		4,691		5,369
Impaired Financing Receivable, Related Reserve	646		646		31
Real Estate-Commercial [Member]
Nonperforming Loans and Leases [Line Items]
Impaired loans with no related reserve, Recorded Investment	7,489		7,489		15,621
Nonaccrual Loans and Leases	19,584		19,584		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	0		0		0
Total Nonperforming Loans and Leases	19,584		19,584		14,551
Impaired Financing Receivable, Related Reserve	866		866		99
Real Estate-Construction [Member]
Nonperforming Loans and Leases [Line Items]
Impaired loans with no related reserve, Recorded Investment	110		110		365
Nonaccrual Loans and Leases	110		110		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	110		110		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	1,926		1,926		3,430
Nonaccrual Loans and Leases	1,538		1,538		2,843
Accruing Troubled Debt Restructured Loans And Lease Modifications	183		183		206
Loans and Leases 90 Days or more Past Due and Accruing Interest	0		0		162
Total Nonperforming Loans and Leases	1,721		1,721		3,211
Impaired Financing Receivable, Related Reserve	12		12		1
Real Estate-Residential Secured for Personal Purpose [Member]
Nonperforming Loans and Leases [Line Items]
Impaired loans with no related reserve, Recorded Investment	1,741		1,741		508
Nonaccrual Loans and Leases	1,741		1,741		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	1,741		1,741		508
Impaired Financing Receivable, Related Reserve	0		0		0
Real Estate-Home Equity Secured for Personal Purpose [Member]
Nonperforming Loans and Leases [Line Items]
Impaired loans with no related reserve, Recorded Investment	1,565		1,565		511
Nonaccrual Loans and Leases	1,565		1,565		511
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		148
Total Nonperforming Loans and Leases	1,565		1,565		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	101		101		195
Total Nonperforming Loans and Leases	101		101		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	1,526		1,526		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	49		49		256
Total Nonperforming Loans and Leases	1,575		1,575		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	$ 9,206	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	0	$ 9,206
Non-Accrual [Member] \| Real Estate-Commercial [Member]
Nonperforming Loans and Leases [Line Items]
Nonaccrual Loans and Leases	12,000		12,000
Impaired Financing Receivable, Related Reserve	$ 650		$ 650
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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