Accumulated Other Comprehensive Income (Loss) - AOCI Components Pre Post & Tax Effect (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Other Comprehensive Income (Loss), Before Tax:
Net Unrealized Gains (Losses) Arising During the Period	$ (166,878)		$ 3,129		$ (412,026)	$ (65,097)
(Gain) Loss on Sale			(3,675)			(3,675)
Amortization of Unrealized Holding (Gains) Losses on HTM Securities	(3)		380		63	506
Net Unrealized Gains (Losses) on Investment Securities	(166,881)		(166)		(411,963)	(68,266)
Amortization of Net Actuarial Losses (Gains)	542		661		1,084	1,323
Amortization of Prior Service Credit	(61)		(62)		(123)	(123)
Defined Benefit Plans, Net	481		599		961	1,200
Other Comprehensive Income (Loss)	(166,400)		433		(411,002)	(67,066)
Other Comprehensive Income (Loss), Tax Effect:
Net Unrealized Gains (Losses) Arising During the Period	(44,233)		848		(109,208)	(17,235)
(Gain) Loss on Sale			(992)			(992)
Amortization of Unrealized Holding (Gains) Losses on HTM Securities	(1)		101		16	134
Net Unrealized Gains (Losses) on Investment Securities	(44,234)		(43)		(109,192)	(18,093)
Amortization of Net Actuarial Losses (Gains)	145		174		288	350
Amortization of Prior Service Credit	(16)		(17)		(32)	(33)
Defined Benefit Plans, Net	129		157		256	317
Other Comprehensive Income (Loss)	(44,105)		114		(108,936)	(17,776)
Other Comprehensive Income (Loss), Net of Tax:
Net Unrealized Gains (Losses) Arising During the Period	(122,645)		2,281		(302,818)	(47,862)
(Gain) Loss on Sale			(2,683)			(2,683)
Amortization of Unrealized Holding (Gains) Losses on HTM Securities	(2)		279		47	372
Net Unrealized Gains (Losses) on Investment Securities	(122,647)		(123)		(302,771)	(50,173)
Amortization of Net Actuarial Losses (Gains)	397		487		796	973
Amortization of Prior Service Credit	(45)		(45)		(91)	(90)
Defined Benefit Plans, Net	352		442		705	883
Total Other Comprehensive Income (Loss)	$ (122,295)	$ (179,771)	$ 319	$ (49,609)	$ (302,066)	$ (49,290)

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