Allowance for Loan Losses and Reserve for Unfunded Loan Commitments - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Allowance for loan losses	$ 12,685	$ 12,758	$ 12,759	$ 12,421	$ 12,404	$ 12,551
Other commitment	183		138
Unallocated
Allowance for loan losses	$ 263	$ 149	$ 162	$ 51	$ 167	$ 105