Loans and Leases - Concessions Granted on Accruing and Nonaccrual Loans Restructured (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) loan	Mar. 31, 2016 USD ($) loan
Accrual Troubled Debt Restructuring Loans [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans | loan	0	1
Amount | $	$ 0	$ 1,545
Accrual Troubled Debt Restructuring Loans [Member] | Amortization Period Extension [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans | loan	0	1
Amount | $	$ 0	$ 1,545
Nonaccrual Troubled Debt Restructuring Loans [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans | loan	0	0
Amount | $	$ 0	$ 0
Nonaccrual Troubled Debt Restructuring Loans [Member] | Amortization Period Extension [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans | loan	0	0
Amount | $	$ 0	$ 0
Commercial, Financial and Agricultural [Member] | Accrual Troubled Debt Restructuring Loans [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans | loan	0	1
Amount | $		$ 1,545
Commercial, Financial and Agricultural [Member] | Accrual Troubled Debt Restructuring Loans [Member] | Amortization Period Extension [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans | loan		1
Amount | $		$ 1,545