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]
Unrealized (loss) gain, available for sale, tax (benefit) expense	$ 88	$ (808)	$ (153)
Reclassification of realized gains, tax expense	61	155	171
Unrealized loss, transfer from available for sale to held to maturity, tax benefit	0	1	2
Change in fair value of interest rate swap designated as a cash flow hedge, tax expense (benefit)	$ 107	$ 206	$ (95)