v3.26.1
OPERATING SEGMENT INFORMATION (Schedule Of Segment Information) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Segment Reporting Information [Line Items]    
Net interest income $ 662 $ 624
Provision for credit losses (7) 18
Net interest income after provision for credit losses 669 606
Noninterest income 187 171
Salaries and employee benefits 361 342
Technology, telecom, and information processing 74 70
Occupancy and equipment, net 41 41
Other direct expenses 86 85
Indirect/allocated expenses 0 0
Total noninterest expense 562 538
Income (loss) before income taxes 294 239
Total average loans 61,141 59,635
Total average deposits 75,459 74,919
Other    
Segment Reporting Information [Line Items]    
Net interest income (2) (5)
Provision for credit losses 1 2
Net interest income after provision for credit losses (3) (7)
Noninterest income 14 21
Salaries and employee benefits 219 203
Technology, telecom, and information processing 63 59
Occupancy and equipment, net 7 7
Other direct expenses 38 26
Indirect/allocated expenses (276) (261)
Total noninterest expense 51 34
Income (loss) before income taxes (40) (20)
Total average loans 876 930
Total average deposits 4,497 5,588
Zions Bank | Operating Segments    
Segment Reporting Information [Line Items]    
Net interest income 182 176
Provision for credit losses (12) 6
Net interest income after provision for credit losses 194 170
Noninterest income 52 42
Salaries and employee benefits 36 36
Technology, telecom, and information processing 4 4
Occupancy and equipment, net 7 7
Other direct expenses 14 18
Indirect/allocated expenses 83 79
Total noninterest expense 144 144
Income (loss) before income taxes 102 68
Total average loans 15,053 14,834
Total average deposits 20,949 21,211
CB&T | Operating Segments    
Segment Reporting Information [Line Items]    
Net interest income 163 152
Provision for credit losses 0 10
Net interest income after provision for credit losses 163 142
Noninterest income 38 28
Salaries and employee benefits 35 34
Technology, telecom, and information processing 1 1
Occupancy and equipment, net 9 8
Other direct expenses 11 10
Indirect/allocated expenses 57 51
Total noninterest expense 113 104
Income (loss) before income taxes 88 66
Total average loans 15,443 14,675
Total average deposits 16,015 14,621
Amegy | Operating Segments    
Segment Reporting Information [Line Items]    
Net interest income 144 132
Provision for credit losses (1) 3
Net interest income after provision for credit losses 145 129
Noninterest income 47 48
Salaries and employee benefits 31 30
Technology, telecom, and information processing 2 2
Occupancy and equipment, net 8 9
Other direct expenses 11 13
Indirect/allocated expenses 66 64
Total noninterest expense 118 118
Income (loss) before income taxes 74 59
Total average loans 14,620 13,953
Total average deposits 15,112 14,812
NBAZ | Operating Segments    
Segment Reporting Information [Line Items]    
Net interest income 67 64
Provision for credit losses 8 (8)
Net interest income after provision for credit losses 59 72
Noninterest income 12 10
Salaries and employee benefits 14 14
Technology, telecom, and information processing 1 1
Occupancy and equipment, net 3 3
Other direct expenses 4 9
Indirect/allocated expenses 26 25
Total noninterest expense 48 52
Income (loss) before income taxes 23 30
Total average loans 5,610 5,701
Total average deposits 6,964 6,947
NSB | Operating Segments    
Segment Reporting Information [Line Items]    
Net interest income 54 53
Provision for credit losses 4 0
Net interest income after provision for credit losses 50 53
Noninterest income 13 12
Salaries and employee benefits 12 12
Technology, telecom, and information processing 1 1
Occupancy and equipment, net 3 3
Other direct expenses 4 5
Indirect/allocated expenses 24 23
Total noninterest expense 44 44
Income (loss) before income taxes 19 21
Total average loans 3,745 3,657
Total average deposits 7,358 7,166
Vectra | Operating Segments    
Segment Reporting Information [Line Items]    
Net interest income 34 35
Provision for credit losses (3) 8
Net interest income after provision for credit losses 37 27
Noninterest income 9 8
Salaries and employee benefits 11 10
Technology, telecom, and information processing 1 1
Occupancy and equipment, net 3 3
Other direct expenses 3 3
Indirect/allocated expenses 16 16
Total noninterest expense 34 33
Income (loss) before income taxes 12 2
Total average loans 3,706 3,921
Total average deposits 3,449 3,440
TCBW | Operating Segments    
Segment Reporting Information [Line Items]    
Net interest income 20 17
Provision for credit losses (4) (3)
Net interest income after provision for credit losses 24 20
Noninterest income 2 2
Salaries and employee benefits 3 3
Technology, telecom, and information processing 1 1
Occupancy and equipment, net 1 1
Other direct expenses 1 1
Indirect/allocated expenses 4 3
Total noninterest expense 10 9
Income (loss) before income taxes 16 13
Total average loans 2,088 1,964
Total average deposits $ 1,115 $ 1,134