Loans and Leases - Nonperforming Loans and Leases (Details) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($) borrowers	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Nonperforming Loans and Leases [Line Items]
Nonaccrual Loans and Leases	$ 15,949			$ 15,949		$ 17,916
Accruing Troubled Debt Restructured Loans And Lease Modifications	11,468			11,468		3,252
Recorded Investment 90 Days or more Past Due and Accruing Interest	1,595			1,595		987
Total Nonperforming Loans and Leases	29,012			29,012		22,155
Nonaccrual Troubled Debt Restructured Loans And Lease Modifications	1,700			1,700		1,800
Number of Borrowers | borrowers		1
Commercial, Financial and Agricultural [Member]
Nonperforming Loans and Leases [Line Items]
Nonaccrual Loans and Leases	5,143			5,143		5,746
Accruing Troubled Debt Restructured Loans And Lease Modifications	929			929		967
Recorded Investment 90 Days or more Past Due and Accruing Interest	0			0		0
Total Nonperforming Loans and Leases	6,072			6,072		6,713
Real Estate-Commercial [Member]
Nonperforming Loans and Leases [Line Items]
Nonaccrual Loans and Leases	4,514			4,514		5,651
Accruing Troubled Debt Restructured Loans And Lease Modifications	10,279			10,279		1,519
Recorded Investment 90 Days or more Past Due and Accruing Interest	164			164		0
Total Nonperforming Loans and Leases	14,957			14,957		7,170
Real Estate-Construction [Member]
Nonperforming Loans and Leases [Line Items]
Nonaccrual Loans and Leases	365			365		0
Accruing Troubled Debt Restructured Loans And Lease Modifications	0			0		0
Recorded Investment 90 Days or more Past Due and Accruing Interest	0			0		0
Total Nonperforming Loans and Leases	365			365		0
Real Estate-Residential Secured for Business Purpose [Member]
Nonperforming Loans and Leases [Line Items]
Nonaccrual Loans and Leases	3,333			3,333		4,898
Accruing Troubled Debt Restructured Loans And Lease Modifications	218			218		766
Recorded Investment 90 Days or more Past Due and Accruing Interest	0			0		0
Total Nonperforming Loans and Leases	3,551			3,551		5,664
Real Estate-Residential Secured for Personal Purpose [Member]
Nonperforming Loans and Leases [Line Items]
Nonaccrual Loans and Leases	530			530		560
Accruing Troubled Debt Restructured Loans And Lease Modifications	42			42		0
Recorded Investment 90 Days or more Past Due and Accruing Interest	423			423		481
Total Nonperforming Loans and Leases	995			995		1,041
Real Estate-Home Equity Secured for Personal Purpose [Member]
Nonperforming Loans and Leases [Line Items]
Nonaccrual Loans and Leases	361			361		525
Accruing Troubled Debt Restructured Loans And Lease Modifications	0			0		0
Recorded Investment 90 Days or more Past Due and Accruing Interest	282			282		171
Total Nonperforming Loans and Leases	643			643		696
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
Recorded Investment 90 Days or more Past Due and Accruing Interest	198			198		142
Total Nonperforming Loans and Leases	198			198		142
Lease Financings [Member]
Nonperforming Loans and Leases [Line Items]
Nonaccrual Loans and Leases	1,703			1,703		536
Accruing Troubled Debt Restructured Loans And Lease Modifications	0			0		0
Recorded Investment 90 Days or more Past Due and Accruing Interest	528			528		193
Total Nonperforming Loans and Leases	2,231			2,231		$ 729
Accrual Troubled Debt Restructuring Loans [Member]
Nonperforming Loans and Leases [Line Items]
Pre- Restructuring Outstanding Recorded Investment	$ 0		$ 0	9,206	$ 1,960
Accrual Troubled Debt Restructuring Loans [Member] | Commercial, Financial and Agricultural [Member]
Nonperforming Loans and Leases [Line Items]
Pre- Restructuring Outstanding Recorded Investment				0	1,545
Accrual Troubled Debt Restructuring Loans [Member] | Real Estate-Commercial [Member]
Nonperforming Loans and Leases [Line Items]
Pre- Restructuring Outstanding Recorded Investment				9,206	0
Accrual Troubled Debt Restructuring Loans [Member] | Real Estate-Residential Secured for Business Purpose [Member]
Nonperforming Loans and Leases [Line Items]
Pre- Restructuring Outstanding Recorded Investment				$ 0	$ 415
Amortization Period Extension [Member] | Accrual Troubled Debt Restructuring Loans [Member]
Nonperforming Loans and Leases [Line Items]
Pre- Restructuring Outstanding Recorded Investment		$ 9,200