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LOANS, LEASES, AND ALLOWANCE FOR CREDIT LOSSES (Summary of Outstanding Loan Balances (Accruing and Nonaccruing) Categorized by Credit Quality Indicators - Current Year) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Total loans
2025	$ 7,130		$ 7,130		$ 8,437
2024	7,626		7,626		6,729
2023	5,773		5,773		11,321
2022	9,505		9,505		7,007
2021	6,036		6,036		3,912
Prior	9,720		9,720		7,759
Revolving loans amortized cost basis	13,866		13,866		13,581
Revolving loans converted to term loans amortized cost basis	646		646		664
Total loans	60,302		60,302		59,410
Gross charge-offs by year of loan origination
2025	0	$ 0	1	$ 0
2024	1	1	2	10
2023	3	5	5	13
2022	1	0	2	2
2021	3	0	7	0
Prior	2	1	15	6
Revolving loans gross charge-offs	57	7	75	17
Revolving loans converted to term loans gross charge-offs	0	1	0	2
Total	67	15	107	50
Commercial:
Total loans
2025	3,730		3,730		4,715
2024	4,338		4,338		3,552
2023	2,786		2,786		4,551
2022	3,670		3,670		3,558
2021	2,987		2,987		1,911
Prior	4,764		4,764		3,796
Revolving loans amortized cost basis	8,617		8,617		8,630
Revolving loans converted to term loans amortized cost basis	287		287		252
Total loans	31,179		31,179		30,965
Gross charge-offs by year of loan origination
2025	0	0	0	0
2024	1	1	2	3
2023	0	5	2	9
2022	1	0	2	2
2021	3	0	6	0
Prior	1	1	12	4
Revolving loans gross charge-offs	55	4	68	10
Revolving loans converted to term loans gross charge-offs	0	1	0	2
Total	61	12	92	30
Commercial real estate:
Total loans
2025	2,599		2,599		2,451
2024	1,954		1,954		2,078
2023	1,931		1,931		3,361
2022	2,504		2,504		1,521
2021	1,181		1,181		1,067
Prior	2,025		2,025		1,734
Revolving loans amortized cost basis	1,034		1,034		961
Revolving loans converted to term loans amortized cost basis	249		249		304
Total loans	13,477		13,477		13,477
Gross charge-offs by year of loan origination
Total	3	0	4	11
Consumer:
Total loans
2025	801		801		1,271
2024	1,334		1,334		1,099
2023	1,056		1,056		3,409
2022	3,331		3,331		1,928
2021	1,868		1,868		934
Prior	2,931		2,931		2,229
Revolving loans amortized cost basis	4,215		4,215		3,990
Revolving loans converted to term loans amortized cost basis	110		110		108
Total loans	15,646		15,646		14,968
Gross charge-offs by year of loan origination
2025	0	0	0	0
2024	0	0	0	0
2023	0	0	0	0
2022	0	0	0	0
2021	0	0	1	0
Prior	1	0	3	2
Revolving loans gross charge-offs	2	3	7	7
Revolving loans converted to term loans gross charge-offs	0	0	0	0
Total	3	3	11	9
Commercial and industrial | Commercial:
Total loans
2025	2,506		2,506		2,576
2024	2,258		2,258		2,031
2023	1,522		1,522		1,782
2022	1,125		1,125		810
2021	467		467		418
Prior	800		800		738
Revolving loans amortized cost basis	8,352		8,352		8,366
Revolving loans converted to term loans amortized cost basis	192		192		170
Total loans	17,222		17,222		16,891
Gross charge-offs by year of loan origination
2025	0	0	0	0
2024	1	1	2	3
2023	0	4	2	8
2022	1	0	2	2
2021	0	0	3	0
Prior	1	1	12	4
Revolving loans gross charge-offs	55	4	68	10
Revolving loans converted to term loans gross charge-offs	0	1	0	2
Total	58	11	89	29
Owner-occupied | Commercial:
Total loans
2025	828		828		1,412
2024	1,356		1,356		936
2023	776		776		1,723
2022	1,586		1,586		1,755
2021	1,613		1,613		927
Prior	2,791		2,791		2,263
Revolving loans amortized cost basis	263		263		264
Revolving loans converted to term loans amortized cost basis	54		54		53
Total loans	9,267		9,267		9,333
Gross charge-offs by year of loan origination
2025		0		0
2024		0		0
2023		1		1
2022		0		0
2021		0		0
Prior		0		0
Revolving loans gross charge-offs		0		0
Revolving loans converted to term loans gross charge-offs		0		0
Total		1		1
Municipal | Commercial:
Total loans
2025	350		350		617
2024	627		627		502
2023	422		422		939
2022	869		869		965
2021	888		888		553
Prior	1,142		1,142		759
Revolving loans amortized cost basis	2		2		0
Revolving loans converted to term loans amortized cost basis	41		41		29
Total loans	4,341		4,341		4,364
Gross charge-offs by year of loan origination
2025	0		0
2024	0		0
2023	0		0
2022	0		0
2021	3		3
Prior	0		0
Revolving loans gross charge-offs	0		0
Revolving loans converted to term loans gross charge-offs	0		0
Total	3		3
Leasing | Commercial:
Total loans
2025	46		46		110
2024	97		97		83
2023	66		66		107
2022	90		90		28
2021	19		19		13
Prior	31		31		36
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans amortized cost basis	0		0		0
Total loans	349		349		377
Gross charge-offs by year of loan origination
2025			0
2024			0
2023			0
2022			0
2021			0
Prior			0
Revolving loans gross charge-offs			0
Revolving loans converted to term loans gross charge-offs			0
Total			0
Term | Commercial real estate:
Total loans
2025	2,255		2,255		2,033
2024	1,415		1,415		1,303
2023	1,335		1,335		2,646
2022	2,297		2,297		1,422
2021	1,180		1,180		1,066
Prior	2,023		2,023		1,725
Revolving loans amortized cost basis	295		295		281
Revolving loans converted to term loans amortized cost basis	208		208		227
Total loans	11,008		11,008		10,703
Gross charge-offs by year of loan origination
2025	0		1	0
2024	0		0	7
2023	3		3	4
2022	0		0	0
2021	0		0	0
Prior	0		0	0
Revolving loans gross charge-offs	0		0	0
Revolving loans converted to term loans gross charge-offs	0		0	0
Total	3		4	11
Construction and land development | Commercial real estate:
Total loans
2025	344		344		418
2024	539		539		775
2023	596		596		715
2022	207		207		99
2021	1		1		1
Prior	2		2		9
Revolving loans amortized cost basis	739		739		680
Revolving loans converted to term loans amortized cost basis	41		41		77
Total loans	2,469		2,469		2,774
1-4 family residential | Consumer:
Total loans
2025	596		596		1,062
2024	968		968		873
2023	926		926		2,967
2022	3,148		3,148		1,886
2021	1,858		1,858		927
Prior	2,927		2,927		2,224
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans amortized cost basis	0		0		0
Total loans	10,423		10,423		9,939
Gross charge-offs by year of loan origination
2025			0	0
2024			0	0
2023			0	0
2022			0	0
2021			1	0
Prior			2	1
Revolving loans gross charge-offs			0	0
Revolving loans converted to term loans gross charge-offs			0	0
Total			3	1
Home equity credit line | Consumer:
Total loans
2025	0		0		0
2024	0		0		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	3,738		3,738		3,534
Revolving loans converted to term loans amortized cost basis	110		110		107
Total loans	3,848		3,848		3,641
Gross charge-offs by year of loan origination
2025		0	0	0
2024		0	0	0
2023		0	0	0
2022		0	0	0
2021		0	0	0
Prior		0	0	0
Revolving loans gross charge-offs		1	1	1
Revolving loans converted to term loans gross charge-offs		0	0	0
Total		1	1	1
Construction and other consumer real estate | Consumer:
Total loans
2025	147		147		157
2024	336		336		191
2023	108		108		420
2022	170		170		34
2021	6		6		5
Prior	2		2		3
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans amortized cost basis	0		0		0
Total loans	769		769		810
Bankcard and other revolving plans | Consumer:
Total loans
2025	0		0		0
2024	0		0		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	477		477		456
Revolving loans converted to term loans amortized cost basis	0		0		1
Total loans	477		477		457
Gross charge-offs by year of loan origination
2025	0	0	0	0
2024	0	0	0	0
2023	0	0	0	0
2022	0	0	0	0
2021	0	0	0	0
Prior	0	0	0	0
Revolving loans gross charge-offs	2	2	6	6
Revolving loans converted to term loans gross charge-offs	0	0	0	0
Total	2	$ 2	6	6
Other | Consumer:
Total loans
2025	58		58		52
2024	30		30		35
2023	22		22		22
2022	13		13		8
2021	4		4		2
Prior	2		2		2
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans amortized cost basis	0		0		0
Total loans	129		129		121
Gross charge-offs by year of loan origination
2025	0		0	0
2024	0		0	0
2023	0		0	0
2022	0		0	0
2021	0		0	0
Prior	1		1	1
Revolving loans gross charge-offs	0		0	0
Revolving loans converted to term loans gross charge-offs	0		0	0
Total	1		1	$ 1
Pass | Commercial and industrial | Commercial:
Total loans
2025	2,491		2,491		2,479
2024	2,136		2,136		1,951
2023	1,453		1,453		1,504
2022	1,014		1,014		759
2021	434		434		387
Prior	749		749		679
Revolving loans amortized cost basis	8,082		8,082		8,043
Revolving loans converted to term loans amortized cost basis	149		149		150
Total loans	16,508		16,508		15,952
Pass | Owner-occupied | Commercial:
Total loans
2025	809		809		1,346
2024	1,323		1,323		907
2023	757		757		1,606
2022	1,457		1,457		1,657
2021	1,506		1,506		900
Prior	2,651		2,651		2,097
Revolving loans amortized cost basis	237		237		234
Revolving loans converted to term loans amortized cost basis	50		50		47
Total loans	8,790		8,790		8,794
Pass | Municipal | Commercial:
Total loans
2025	350		350		604
2024	624		624		498
2023	422		422		939
2022	869		869		960
2021	886		886		553
Prior	1,124		1,124		753
Revolving loans amortized cost basis	2		2		0
Revolving loans converted to term loans amortized cost basis	41		41		29
Total loans	4,318		4,318		4,336
Pass | Leasing | Commercial:
Total loans
2025	46		46		109
2024	95		95		79
2023	63		63		94
2022	78		78		26
2021	18		18		12
Prior	30		30		36
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans amortized cost basis	0		0		0
Total loans	330		330		356
Pass | Term | Commercial real estate:
Total loans
2025	1,954		1,954		1,687
2024	1,301		1,301		1,198
2023	1,174		1,174		2,093
2022	1,788		1,788		1,278
2021	1,102		1,102		1,053
Prior	1,951		1,951		1,608
Revolving loans amortized cost basis	268		268		254
Revolving loans converted to term loans amortized cost basis	154		154		175
Total loans	9,692		9,692		9,346
Pass | Construction and land development | Commercial real estate:
Total loans
2025	293		293		361
2024	530		530		701
2023	513		513		445
2022	127		127		4
2021	1		1		1
Prior	2		2		9
Revolving loans amortized cost basis	739		739		680
Revolving loans converted to term loans amortized cost basis	41		41		52
Total loans	2,246		2,246		2,253
Pass | 1-4 family residential | Consumer:
Total loans
2025	595		595		1,062
2024	966		966		870
2023	921		921		2,959
2022	3,135		3,135		1,877
2021	1,844		1,844		925
Prior	2,898		2,898		2,197
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans amortized cost basis	0		0		0
Total loans	10,359		10,359		9,890
Pass | Home equity credit line | Consumer:
Total loans
2025	0		0		0
2024	0		0		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	3,702		3,702		3,506
Revolving loans converted to term loans amortized cost basis	106		106		99
Total loans	3,808		3,808		3,605
Pass | Construction and other consumer real estate | Consumer:
Total loans
2025	147		147		157
2024	336		336		191
2023	108		108		420
2022	170		170		34
2021	6		6		5
Prior	2		2		3
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans amortized cost basis	0		0		0
Total loans	769		769		810
Pass | Bankcard and other revolving plans | Consumer:
Total loans
2025	0		0		0
2024	0		0		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	474		474		453
Revolving loans converted to term loans amortized cost basis	0		0		1
Total loans	474		474		454
Pass | Other | Consumer:
Total loans
2025	58		58		52
2024	30		30		35
2023	22		22		22
2022	13		13		8
2021	4		4		2
Prior	2		2		2
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans amortized cost basis	0		0		0
Total loans	129		129		121
Special Mention | Commercial and industrial | Commercial:
Total loans
2025	10		10		37
2024	58		58		24
2023	7		7		47
2022	2		2		8
2021	11		11		2
Prior	14		14		34
Revolving loans amortized cost basis	87		87		85
Revolving loans converted to term loans amortized cost basis	5		5		5
Total loans	194		194		242
Special Mention | Owner-occupied | Commercial:
Total loans
2025	2		2		38
2024	2		2		0
2023	0		0		38
2022	11		11		31
2021	12		12		2
Prior	24		24		18
Revolving loans amortized cost basis	0		0		18
Revolving loans converted to term loans amortized cost basis	1		1		1
Total loans	52		52		146
Special Mention | Municipal | Commercial:
Total loans
2025	0		0		0
2024	3		3		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans amortized cost basis	0		0		0
Total loans	3		3		0
Special Mention | Leasing | Commercial:
Total loans
2025	0		0		0
2024	0		0		0
2023	0		0		2
2022	0		0		0
2021	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans amortized cost basis	0		0		0
Total loans	0		0		2
Special Mention | Term | Commercial real estate:
Total loans
2025	9		9		48
2024	13		13		0
2023	10		10		87
2022	99		99		0
2021	0		0		0
Prior	1		1		5
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans amortized cost basis	0		0		0
Total loans	132		132		140
Special Mention | Construction and land development | Commercial real estate:
Total loans
2025	0		0		0
2024	1		1		22
2023	36		36		21
2022	32		32		17
2021	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans amortized cost basis	0		0		25
Total loans	69		69		85
Special Mention | 1-4 family residential | Consumer:
Total loans
2025	0		0		0
2024	0		0		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans amortized cost basis	0		0		0
Total loans	0		0		0
Special Mention | Home equity credit line | Consumer:
Total loans
2025	0		0		0
2024	0		0		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans amortized cost basis	0		0		0
Total loans	0		0		0
Special Mention | Construction and other consumer real estate | Consumer:
Total loans
2025	0		0		0
2024	0		0		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans amortized cost basis	0		0		0
Total loans	0		0		0
Special Mention | Bankcard and other revolving plans | Consumer:
Total loans
2025	0		0		0
2024	0		0		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans amortized cost basis	0		0		0
Total loans	0		0		0
Special Mention | Other | Consumer:
Total loans
2025	0		0		0
2024	0		0		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans amortized cost basis	0		0		0
Total loans	0		0		0
Accruing Substandard | Commercial and industrial | Commercial:
Total loans
2025	1		1		53
2024	60		60		43
2023	59		59		200
2022	70		70		26
2021	19		19		28
Prior	31		31		21
Revolving loans amortized cost basis	162		162		200
Revolving loans converted to term loans amortized cost basis	11		11		12
Total loans	413		413		583
Accruing Substandard | Owner-occupied | Commercial:
Total loans
2025	11		11		23
2024	24		24		28
2023	17		17		75
2022	112		112		66
2021	93		93		25
Prior	101		101		133
Revolving loans amortized cost basis	24		24		7
Revolving loans converted to term loans amortized cost basis	3		3		5
Total loans	385		385		362
Accruing Substandard | Municipal | Commercial:
Total loans
2025	0		0		10
2024	0		0		4
2023	0		0		0
2022	0		0		0
2021	0		0		0
Prior	18		18		3
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans amortized cost basis	0		0		0
Total loans	18		18		17
Accruing Substandard | Leasing | Commercial:
Total loans
2025	0		0		1
2024	1		1		3
2023	2		2		10
2022	10		10		2
2021	1		1		1
Prior	1		1		0
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans amortized cost basis	0		0		0
Total loans	15		15		17
Accruing Substandard | Term | Commercial real estate:
Total loans
2025	270		270		298
2024	101		101		105
2023	135		135		443
2022	388		388		144
2021	78		78		13
Prior	61		61		102
Revolving loans amortized cost basis	27		27		27
Revolving loans converted to term loans amortized cost basis	54		54		26
Total loans	1,114		1,114		1,158
Accruing Substandard | Construction and land development | Commercial real estate:
Total loans
2025	51		51		57
2024	8		8		52
2023	47		47		249
2022	48		48		78
2021	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans amortized cost basis	0		0		0
Total loans	154		154		436
Accruing Substandard | 1-4 family residential | Consumer:
Total loans
2025	0		0		0
2024	0		0		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
Prior	1		1		0
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans amortized cost basis	0		0		0
Total loans	1		1		0
Accruing Substandard | Home equity credit line | Consumer:
Total loans
2025	0		0		0
2024	0		0		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	8		8		6
Revolving loans converted to term loans amortized cost basis	0		0		0
Total loans	8		8		6
Accruing Substandard | Construction and other consumer real estate | Consumer:
Total loans
2025	0		0		0
2024	0		0		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans amortized cost basis	0		0		0
Total loans	0		0		0
Accruing Substandard | Bankcard and other revolving plans | Consumer:
Total loans
2025	0		0		0
2024	0		0		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	2		2		2
Revolving loans converted to term loans amortized cost basis	0		0		0
Total loans	2		2		2
Accruing Substandard | Other | Consumer:
Total loans
2025	0		0		0
2024	0		0		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans amortized cost basis	0		0		0
Total loans	0		0		0
Nonaccrual | Commercial and industrial | Commercial:
Total loans
2025	4		4		7
2024	4		4		13
2023	3		3		31
2022	39		39		17
2021	3		3		1
Prior	6		6		4
Revolving loans amortized cost basis	21		21		38
Revolving loans converted to term loans amortized cost basis	27		27		3
Total loans	107		107		114
Nonaccrual | Owner-occupied | Commercial:
Total loans
2025	6		6		5
2024	7		7		1
2023	2		2		4
2022	6		6		1
2021	2		2		0
Prior	15		15		15
Revolving loans amortized cost basis	2		2		5
Revolving loans converted to term loans amortized cost basis	0		0		0
Total loans	40		40		31
Nonaccrual | Municipal | Commercial:
Total loans
2025	0		0		3
2024	0		0		0
2023	0		0		0
2022	0		0		5
2021	2		2		0
Prior	0		0		3
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans amortized cost basis	0		0		0
Total loans	2		2		11
Nonaccrual | Leasing | Commercial:
Total loans
2025	0		0		0
2024	1		1		1
2023	1		1		1
2022	2		2		0
2021	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans amortized cost basis	0		0		0
Total loans	4		4		2
Nonaccrual | Term | Commercial real estate:
Total loans
2025	22		22		0
2024	0		0		0
2023	16		16		23
2022	22		22		0
2021	0		0		0
Prior	10		10		10
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans amortized cost basis	0		0		26
Total loans	70		70		59
Nonaccrual | Construction and land development | Commercial real estate:
Total loans
2025	0		0		0
2024	0		0		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans amortized cost basis	0		0		0
Total loans	0		0		0
Nonaccrual | 1-4 family residential | Consumer:
Total loans
2025	1		1		0
2024	2		2		3
2023	5		5		8
2022	13		13		9
2021	14		14		2
Prior	28		28		27
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans amortized cost basis	0		0		0
Total loans	63		63		49
Nonaccrual | Home equity credit line | Consumer:
Total loans
2025	0		0		0
2024	0		0		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	28		28		22
Revolving loans converted to term loans amortized cost basis	4		4		8
Total loans	32		32		30
Nonaccrual | Construction and other consumer real estate | Consumer:
Total loans
2025	0		0		0
2024	0		0		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans amortized cost basis	0		0		0
Total loans	0		0		0
Nonaccrual | Bankcard and other revolving plans | Consumer:
Total loans
2025	0		0		0
2024	0		0		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	1		1		1
Revolving loans converted to term loans amortized cost basis	0		0		0
Total loans	1		1		1
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2025	0		0		0
2024	0		0		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	0		0		0
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