Accumulated Other Comprehensive Income/(Loss) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Net unrealized gain on investment securities available-for-sale	$ 5,332	$ 713
Cash flow hedge	(717)	(77)
Unamortized component of securities transferred from available-for-sale to held-to-maturity		(1,173)
Defined benefit pension and post-retirement plans	(3,891)	(4,072)
Total accumulated other comprehensive income (loss)	$ 724	$ (4,609)