Loans and Leases - Concessions Granted on Accruing and Nonaccrual Loans Restructured (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($) loan	Jun. 30, 2016 USD ($) loan	Jun. 30, 2017 USD ($) loan	Jun. 30, 2016 USD ($) loan
Accrual Troubled Debt Restructuring Loans [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans | loan	3	1	3	2
Amount | $	$ 9,206	$ 415	$ 9,206	$ 1,960
Accrual Troubled Debt Restructuring Loans [Member] | Interest Only Terms Extension [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans | loan	0	1	0	1
Amount | $	$ 0	$ 415	$ 0	$ 415
Accrual Troubled Debt Restructuring Loans [Member] | Extended Maturity [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans | loan	0	0	0	0
Amount | $	$ 0	$ 0	$ 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	3	0	3	1
Amount | $	$ 9,206	$ 0	$ 9,206	$ 1,545
Nonaccrual Troubled Debt Restructuring Loans [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans | loan	1	0	1	0
Amount | $	$ 328	$ 0	$ 328	$ 0
Nonaccrual Troubled Debt Restructuring Loans [Member] | Interest Only Terms Extension [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans | loan	0	0	0	0
Amount | $	$ 0	$ 0	$ 0	$ 0
Nonaccrual Troubled Debt Restructuring Loans [Member] | Extended Maturity [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans | loan	1	0	1	0
Amount | $	$ 328	$ 0	$ 328	$ 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	0	0
Amount | $	$ 0	$ 0	$ 0	$ 0
Real Estate-Commercial [Member] | Accrual Troubled Debt Restructuring Loans [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans | loan	3	0	3	0
Amount | $	$ 9,206		$ 9,206
Real Estate-Commercial [Member] | Accrual Troubled Debt Restructuring Loans [Member] | Interest Only Terms Extension [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans | loan	0		0
Amount | $	$ 0		$ 0
Real Estate-Commercial [Member] | Accrual Troubled Debt Restructuring Loans [Member] | Extended Maturity [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans | loan	0		0
Amount | $	$ 0		$ 0
Real Estate-Commercial [Member] | Accrual Troubled Debt Restructuring Loans [Member] | Amortization Period Extension [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans | loan	3		3
Amount | $	$ 9,206		$ 9,206
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	1	0
Amount | $	$ 328		$ 328
Real Estate-Commercial [Member] | Nonaccrual Troubled Debt Restructuring Loans [Member] | Interest Only Terms Extension [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans | loan	0		0
Amount | $	$ 0		$ 0
Real Estate-Commercial [Member] | Nonaccrual Troubled Debt Restructuring Loans [Member] | Extended Maturity [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans | loan	1		1
Amount | $	$ 328		$ 328
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	0		0
Amount | $	$ 0		$ 0
Real Estate-Residential Secured for Business Purpose [Member] | Accrual Troubled Debt Restructuring Loans [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans | loan	0	1	0	1
Amount | $		$ 415		$ 415
Real Estate-Residential Secured for Business Purpose [Member] | Accrual Troubled Debt Restructuring Loans [Member] | Interest Only Terms Extension [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans | loan		1		1
Amount | $		$ 415		$ 415
Real Estate-Residential Secured for Business Purpose [Member] | Accrual Troubled Debt Restructuring Loans [Member] | Extended Maturity [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans | loan		0		0
Amount | $		$ 0		$ 0
Real Estate-Residential Secured for Business Purpose [Member] | 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
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] | Interest Only Terms Extension [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans | loan				0
Amount | $				$ 0
Commercial, Financial and Agricultural [Member] | Accrual Troubled Debt Restructuring Loans [Member] | Extended Maturity [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans | loan				0
Amount | $				$ 0
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
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 | loan	0
Amount | $	$ 0
Real Estate Residential Secured For Personal Purpose [Member] | Nonaccrual Troubled Debt Restructuring Loans [Member] | Interest Only Terms Extension [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans | loan	0
Amount | $	$ 0
Real Estate Residential Secured For Personal Purpose [Member] | Nonaccrual Troubled Debt Restructuring Loans [Member] | Extended Maturity [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans | loan	0
Amount | $	$ 0
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 | loan	0
Amount | $	$ 0