CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 18,751	$ 18,322	$ 56,682	$ 51,263
Other comprehensive income (loss), net of tax:
Net change in fair value of available for sale debt securities	(3,137)	(3,505)	(12,322)	7,493
Net change in fair value of cash flow hedges, net of tax	(403)	154	(36)	(888)
Net change in defined benefit plan obligations	540	410	1,621	1,229
Total other comprehensive income (loss), net of tax	(3,000)	(2,941)	(10,737)	7,834
Total comprehensive income	$ 15,751	$ 15,381	$ 45,945	$ 59,097