Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Other Comprehensive Income (Loss)
Pre-Tax Amount	$ (22,097)	$ (25,514)	$ (2,432)	$ (76,388)
Tax Benefit	4,712	5,386	514	16,307
Net of Tax Amount	(17,385)	(20,128)	(1,918)	(60,081)
Change in net unrealized gains (losses) on available-for-sale debt securities
Other Comprehensive Income (Loss)
Pre-Tax Amount	(14,190)	(23,009)	(130)	(71,270)
Tax Benefit	3,013	4,872	12	15,204
Net of Tax Amount	(11,177)	(18,137)	(118)	(56,066)
Change in interest rate swap
Other Comprehensive Income (Loss)
Pre-Tax Amount	(8,308)	(3,271)	(2,228)	(5,872)
Tax Benefit	1,774	696	476	1,253
Net of Tax Amount	(6,534)	(2,575)	(1,752)	(4,619)
Adjustment to funded status of employee benefit plans
Other Comprehensive Income (Loss)
Pre-Tax Amount	401	766	(74)	754
Tax Benefit	(75)	(182)	26	(150)
Net of Tax Amount	$ 326	$ 584	$ (48)	$ 604