CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 68,432	$ 45,925	$ 46,481
Other comprehensive (loss) income, net of tax:
Net change in fair value of securities available for sale	(9,228)	621	(7,876)
Net change in fair value of cash flow hedges	619	(52)	(257)
Net change in defined benefit pension plan obligations	3,810	(97)	(1,925)
Total other comprehensive (loss) income, net of tax	(4,799)	472	(10,058)
Total comprehensive income	$ 63,633	$ 46,397	$ 36,423