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Accumulated Other Comprehensive Income (Loss) - AOCI Components Pre Post & Tax Effect (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Other Comprehensive Income (Loss), Before Tax:
Net Unrealized Gains (Losses) Arising During the Period	$ 46,623	$ (38,035)	$ 64,049	$ (36,702)
Loss on Sale		4,582		4,582
Amortization of Unrealized Holding Losses on HTM Securities	6,207	6,787	18,703	20,500
Net Unrealized Gains (Losses) on Investment Securities	52,830	(26,666)	82,752	(11,620)
Amortization of Net Actuarial Losses	291	177	873	528
Amortization of Prior Service Credit	(62)	(62)	(184)	(184)
Defined Benefit Plans, Net	229	115	689	344
Other Comprehensive Income (Loss)	53,059	(26,551)	83,441	(11,276)
Other Comprehensive Income (Loss), Tax Effect:
Net Unrealized Gains (Losses) Arising During the Period	12,352	(11,439)	16,971	(11,086)
Loss on Sale		1,237		1,237
Amortization of Unrealized Holding Losses on HTM Securities	1,645	1,800	4,958	5,434
Net Unrealized Gains on Investment Securities	13,997	(8,402)	21,929	(4,415)
Amortization of Net Actuarial Losses	77	46	232	140
Amortization of Prior Service Credit	(16)	(15)	(48)	(48)
Defined Benefit Plans, Net	61	31	184	92
Other Comprehensive Income (Loss)	14,058	(8,371)	22,113	(4,323)
Other Comprehensive Income (Loss), Net of Tax:
Net Unrealized Gains (Losses) Arising During the Period	34,271	(26,596)	47,078	(25,616)
Loss on Sale		3,345		3,345
Amortization of Unrealized Holding Losses on HTM Securities	4,562	4,987	13,745	15,066
Net Unrealized Gains (Losses) on Investment Securities	38,833	(18,264)	60,823	(7,205)
Amortization of Net Actuarial Losses	214	131	641	388
Amortization of Prior Service Credit	(46)	(47)	(136)	(136)
Defined Benefit Plans, Net	168	84	505	252
Total Other Comprehensive Income (Loss)	$ 39,001	$ (18,180)	$ 61,328	$ (6,953)

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Amount, after tax and before adjustment, of unrealized holding gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Excludes unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-9

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 10A
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482790/220-10-45-11

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X

- Definition

Amount, before adjustment, of tax expense (benefit) for unrealized holding gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Excludes tax expense (benefit) for unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 12
-SubTopic 10
-Topic 220
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482790/220-10-45-12

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 10A
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A

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