Loans and Leases - Concessions Granted on Accruing and Nonaccrual Loans Restructured (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($) loan	Jun. 30, 2018 USD ($) loan	Jun. 30, 2019 USD ($) loan		Jun. 30, 2018 USD ($) loan
Accrual Troubled Debt Restructuring Loans [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans	1	0	1		0
Accrual Troubled Debt Restructuring Loans [Member] | Amortization Period Extension [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans	1	0	1		0
Financing Receivable Modifications Recorded Investments | $	$ 55	$ 0	$ 55		$ 0
Nonaccrual Troubled Debt Restructuring Loans [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans	0	1	3		1
Nonaccrual Troubled Debt Restructuring Loans [Member] | Amortization Period Extension [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans	0	1	3		1
Financing Receivable Modifications Recorded Investments | $	$ 0	$ 66	$ 2,269		$ 66
Real Estate-Home Equity Secured for Personal Purpose [Member] | Accrual Troubled Debt Restructuring Loans [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans	1	0	1		0
Real Estate-Home Equity Secured for Personal Purpose [Member] | Accrual Troubled Debt Restructuring Loans [Member] | Amortization Period Extension [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans	1		1
Financing Receivable Modifications Recorded Investments | $	$ 55		$ 55
Real Estate Residential Secured For Personal Purpose [Member] | Nonaccrual Troubled Debt Restructuring Loans [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans	0	1	0		1
Real Estate Residential Secured For Personal Purpose [Member] | Nonaccrual Troubled Debt Restructuring Loans [Member] | Amortization Period Extension [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans		1			1
Financing Receivable Modifications Recorded Investments | $		$ 66			$ 66
Commercial, Financial and Agricultural [Member] | Nonaccrual Troubled Debt Restructuring Loans [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans			2	[1]	0
Commercial, Financial and Agricultural [Member] | Nonaccrual Troubled Debt Restructuring Loans [Member] | Amortization Period Extension [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans			2
Financing Receivable Modifications Recorded Investments | $			$ 956
Real Estate-Commercial [Member] | Nonaccrual Troubled Debt Restructuring Loans [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans			1	[1]	0
Real Estate-Commercial [Member] | Nonaccrual Troubled Debt Restructuring Loans [Member] | Amortization Period Extension [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans			1
Financing Receivable Modifications Recorded Investments | $			$ 1,313

[1] * The three nonaccrual troubled debt restructured loans during the six months ended June 30, 2019 in the above table were modified via the execution of a forbearance agreement. These loans relate to one borrower and were on nonaccrual status at the time of modification.