Loans and Leases - Impaired Loans (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Impaired Loans [Abstract]
Cash collected on non accrual and impaired loan			$ 1,400,000	$ 5,900,000
Amount credited to principal balance outstanding			1,300,000	4,800,000
Summary of impaired loans [Abstract]
Impaired loans with a valuation allowance	$ 1,390,000		1,390,000		$ 2,414,000
Impaired loans without a valuation allowance	3,945,000		3,945,000		4,777,000
Valuation allowance related to impaired loans	186,000		186,000		$ 398,000
Average recorded investment [Abstract]
Average investment in impaired loans and leases	5,835,000	$ 10,622,000	6,332,000	13,077,000
Interest income recognized on a cash basis on impaired loans and leases	$ 0	$ 97,000	$ 0	$ 232,000