Loans and Leases - Impaired Loans (Details) - USD ($)	3 Months Ended		6 Months Ended		15 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Dec. 31, 2015
Impaired Loans [Abstract]
Cash collected on non accrual and impaired loan			$ 1,100,000	$ 3,600,000
Amount credited to principal balance outstanding			994,000	2,700,000
Summary of impaired loans [Abstract]
Impaired loans with a valuation allowance	$ 1,860,000		1,860,000		$ 1,860,000	$ 2,414,000
Impaired loans without a valuation allowance	4,345,000		4,345,000		4,345,000	4,777,000
Valuation allowance related to impaired loans	337,000		337,000		337,000	$ 398,000
Average recorded investment [Abstract]
Average investment in impaired loans and leases	6,278,000	$ 13,270,000	6,598,000	14,142,000
Interest income recognized on a cash basis on impaired loans and leases	$ 0	$ 0	$ 0	$ 135,000	$ 0