Fair Value of Financial Instruments - Measurement (Details) - Nonrecurring [Member] - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans and leases	$ 1,760	$ 6,102
Other real estate owned	864	1,471
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans and leases	1,760	6,102
Other real estate owned	$ 864	$ 1,471