Loans and Leases - Impaired Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Impaired Loans [Abstract]
Cash collected on non accrual and impaired loan	$ 1,800	$ 9,600
Amount credited to principal balance outstanding	1,700	8,400
Summary of impaired loans [Abstract]
Impaired loans with a valuation allowance	2,509	2,414
Impaired loans without a valuation allowance	4,446	4,777
Valuation allowance related to impaired loans	$ 368	398
Average recorded investment [Abstract]
Interest income recognized on a cash basis on impaired loans and leases		$ 234