CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 11,901	$ 17,495
Other comprehensive income (loss), net of tax:
Net change in fair value of available for sale debt securities	12,806	11,021
Net change in fair value of cash flow hedges	(1,050)	(442)
Net change in defined benefit plan obligations	410	227
Total other comprehensive income (loss), net of tax	12,166	10,806
Total comprehensive income	$ 24,067	$ 28,301