Loans and Leases - Nonperforming Loans and Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Nonperforming Loans and Leases [Line Items]
Nonaccrual Loans and Leases	$ 25,952	$ 26,208
Accruing Troubled Debt Restructured Loans And Lease Modifications	270	542
Loans and Leases 90 Days or more Past Due and Accruing Interest	636	192
Total Nonperforming Loans and Leases	26,858	26,942
Nonaccrual Troubled Debt Restructured Loans And Lease Modifications	3,200	1,300
Commercial, Financial and Agricultural [Member]
Nonperforming Loans and Leases [Line Items]
Nonaccrual Loans and Leases	2,904	3,365
Accruing Troubled Debt Restructured Loans And Lease Modifications	270	382
Loans and Leases 90 Days or more Past Due and Accruing Interest	0	0
Total Nonperforming Loans and Leases	3,174	3,747
Real Estate-Commercial [Member]
Nonperforming Loans and Leases [Line Items]
Nonaccrual Loans and Leases	18,361	18,214
Accruing Troubled Debt Restructured Loans And Lease Modifications	0	0
Loans and Leases 90 Days or more Past Due and Accruing Interest	0	0
Total Nonperforming Loans and Leases	18,361	18,214
Real Estate-Construction [Member]
Nonperforming Loans and Leases [Line Items]
Nonaccrual Loans and Leases	106	106
Accruing Troubled Debt Restructured Loans And Lease Modifications	0	0
Loans and Leases 90 Days or more Past Due and Accruing Interest	0	0
Total Nonperforming Loans and Leases	106	106
Real Estate-Residential Secured for Business Purpose [Member]
Nonperforming Loans and Leases [Line Items]
Nonaccrual Loans and Leases	1,232	1,318
Accruing Troubled Debt Restructured Loans And Lease Modifications	0	160
Loans and Leases 90 Days or more Past Due and Accruing Interest	0	0
Total Nonperforming Loans and Leases	1,232	1,478
Real Estate-Residential Secured for Personal Purpose [Member]
Nonperforming Loans and Leases [Line Items]
Nonaccrual Loans and Leases	1,636	1,587
Accruing Troubled Debt Restructured Loans And Lease Modifications	0	0
Loans and Leases 90 Days or more Past Due and Accruing Interest	325	0
Total Nonperforming Loans and Leases	1,961	1,587
Real Estate-Home Equity Secured for Personal Purpose [Member]
Nonperforming Loans and Leases [Line Items]
Nonaccrual Loans and Leases	1,493	1,448
Accruing Troubled Debt Restructured Loans And Lease Modifications	0	0
Loans and Leases 90 Days or more Past Due and Accruing Interest	0	0
Total Nonperforming Loans and Leases	1,493	1,448
Loans to Individuals [Member]
Nonperforming Loans and Leases [Line Items]
Nonaccrual Loans and Leases	0	0
Accruing Troubled Debt Restructured Loans And Lease Modifications	0	0
Loans and Leases 90 Days or more Past Due and Accruing Interest	54	55
Total Nonperforming Loans and Leases	54	55
Lease Financings [Member]
Nonperforming Loans and Leases [Line Items]
Nonaccrual Loans and Leases	220	170
Accruing Troubled Debt Restructured Loans And Lease Modifications	0	0
Loans and Leases 90 Days or more Past Due and Accruing Interest	257	137
Total Nonperforming Loans and Leases	$ 477	$ 307