Loans and Leases - Concessions Granted on Accruing and Nonaccrual Loans Restructured (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) loan	Mar. 31, 2018 USD ($) loan
Accrual Troubled Debt Restructuring Loans [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans | loan	0	0
Financing Receivable Modifications Recorded Investments | $	$ 0	$ 0
Accrual Troubled Debt Restructuring Loans [Member] | Amortization Period Extension [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans | loan	0	0
Financing Receivable Modifications Recorded Investments | $	$ 0	$ 0
Nonaccrual Troubled Debt Restructuring Loans [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans | loan	3	0
Financing Receivable Modifications Recorded Investments | $	$ 2,269	$ 0
Nonaccrual Troubled Debt Restructuring Loans [Member] | Amortization Period Extension [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans | loan	3	0
Financing Receivable Modifications Recorded Investments | $	$ 2,269	$ 0
Commercial, Financial and Agricultural [Member] | Nonaccrual Troubled Debt Restructuring Loans [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans | loan	2	0
Financing Receivable Modifications Recorded Investments | $	$ 956
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 | loan	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 | loan	1	0
Financing Receivable Modifications Recorded Investments | $	$ 1,313
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 | loan	1
Financing Receivable Modifications Recorded Investments | $	$ 1,313