Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net unrealized gain (loss) on cashflow hedge	$ 2,556	$ 459	$ (2,160)
Net unrealized gain (loss) on cashflow hedge, deferred taxes	946	170	(799)
Net unrealized gain (loss) on available for sale debt securities	4,378	(4,913)	(1,852)
Net unrealized gain (loss) on available for sale debt securities, deferred taxes	1,620	(1,818)	(685)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax	(14)	1,127	1,444
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax	(5)	417	534
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax	521	0	0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Tax	$ 193	$ 0	$ 0