Loans and Leases - Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Impaired Loans [Abstract]
Cash collected on non accrual and impaired loan			$ 5,900	$ 5,000
Amount credited to principal balance outstanding			4,800	4,500
Summary of impaired loans [Abstract]
Impaired loans with a valuation allowance	$ 2,049		2,049		$ 3,274
Impaired loans without a valuation allowance	8,069		8,069		12,804
Valuation allowance related to impaired loans	322		322		$ 1,041
Average recorded investment [Abstract]
Average investment in impaired loans and leases	10,622	$ 15,531	13,077	16,602
Interest income recognized on a cash basis on impaired loans and leases	$ 174	$ 96	$ 471	$ 292