Loans and Leases - Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Impaired Loans [Abstract]
Cash collected on non accrual and impaired loan			$ 3,600	$ 3,000
Amount credited to principal balance outstanding			2,700	2,600
Summary of impaired loans [Abstract]
Impaired loans with a valuation allowance	$ 1,579		1,579		$ 3,274
Impaired loans without a valuation allowance	9,680		9,680		12,804
Valuation allowance related to impaired loans	114		114		$ 1,041
Average recorded investment [Abstract]
Average investment in impaired loans and leases	13,270	$ 16,159	14,142	16,973
Interest income recognized on a cash basis on impaired loans and leases	$ 81	$ 95	$ 297	$ 196