Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 28,222	$ 27,422	$ 28,362	$ 33,649	$ 23,657	$ 17,606	$ 7,430	$ 16,121	$ 117,655	$ 64,814	$ 92,072
Other comprehensive income (loss), net of tax:
Unrealized gains (losses) on available for sale securities arising during the period, after reclassifications									(13,788)	11,126	17,159
Change in minimum pension liability, after reclassifications									2,602	6,972	(4,502)
Change in joint beneficiary agreement liability									(113)	(596)	0
Other comprehensive income (loss)									(11,299)	17,502	12,657
Comprehensive income									$ 106,356	$ 82,316	$ 104,729