CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 76,870	$ 69,829	$ 69,118
Other comprehensive (loss) income, net of tax:
Net change in fair value of available for sale debt securities	(16,676)	6,655	19,988
Net change in fair value of cash flow hedges	(2,566)	(654)	(984)
Net change in defined benefit plan obligations	6,652	(2,155)	(1,932)
Total other comprehensive (loss) income, net of tax	(12,590)	3,846	17,072
Total comprehensive income	$ 64,280	$ 73,675	$ 86,190