Loans and Leases - Impaired Loans (Details) - USD ($)	3 Months Ended		15 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Dec. 31, 2016
Impaired Loans [Abstract]
Cash collected on non accrual and impaired loan	$ 133,000	$ 257,000
Amount credited to principal balance outstanding	109,000	257,000
Summary of impaired loans [Abstract]
Impaired loans with a valuation allowance	2,771,000		$ 2,771,000	$ 2,509,000
Impaired loans without a valuation allowance	4,168,000		4,168,000	4,446,000
Valuation allowance related to impaired loans	251,000		251,000	$ 368,000
Average recorded investment [Abstract]
Average investment in impaired loans and leases	7,052,000	6,884,000
Interest income recognized on a cash basis on impaired loans and leases	$ 0	$ 0	$ 0