CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 17,460	$ 21,040	$ 37,931	$ 32,941
Other comprehensive income (loss), net of tax:
Net change in fair value of available for sale debt securities	4,134	(1,808)	(9,185)	10,998
Net change in fair value of cash flow hedges	70	8	367	(1,042)
Net change in defined benefit plan obligations	674	409	1,081	819
Total other comprehensive income (loss), net of tax	4,878	(1,391)	(7,737)	10,775
Total comprehensive income	$ 22,338	$ 19,649	$ 30,194	$ 43,716