Shareholders' Equity and Earnings Per Common Share - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Shareholders’ Equity and Earnings Per Common Share
Deferred taxes included in AOCI	$ 900	$ 620
Net unrealized gains on securities	4,260	3,491
Net unrecognized loss on cash flow hedges	(390)	(107)
Net unrecognized losses on defined benefit plan	(2,168)	(2,213)
Total accumulated other comprehensive income	$ 1,702	$ 1,171