v3.25.3
OPERATING SEGMENT INFORMATION (Schedule Of Segment Information) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]        
Net interest income $ 672 $ 620 $ 1,944 $ 1,803
Provision for credit losses 49 13 66 31
Net interest income after provision for credit losses 623 607 1,878 1,772
Noninterest income 189 172 550 507
Salaries and employee benefits 337 317 1,015 966
Technology, telecom, and information processing 70 66 205 194
Occupancy and equipment, net 42 40 123 119
Other direct expenses 78 79 249 258
Indirect/allocated expenses 0 0 0 0
Total noninterest expense 527 502 1,592 1,537
Income (loss) before income taxes 285 277 836 742
Total average loans 60,786 58,665 60,298 58,289
Total average deposits 74,303 75,029 74,494 74,208
Other        
Segment Reporting Information [Line Items]        
Net interest income (3) (6) (10) 5
Provision for credit losses 1 0 1 (2)
Net interest income after provision for credit losses (4) (6) (11) 7
Noninterest income 24 19 75 59
Salaries and employee benefits 203 188 608 570
Technology, telecom, and information processing 59 56 174 163
Occupancy and equipment, net 8 8 26 24
Other direct expenses 28 25 87 77
Indirect/allocated expenses (275) (260) (809) (786)
Total noninterest expense 23 17 86 48
Income (loss) before income taxes (3) (4) (22) 18
Total average loans 866 951 903 957
Total average deposits 4,544 5,628 5,090 5,267
Zions Bank | Operating Segments        
Segment Reporting Information [Line Items]        
Net interest income 191 174 549 506
Provision for credit losses 2 11 15 (7)
Net interest income after provision for credit losses 189 163 534 513
Noninterest income 49 46 141 136
Salaries and employee benefits 35 34 105 105
Technology, telecom, and information processing 3 4 11 11
Occupancy and equipment, net 7 6 20 20
Other direct expenses 12 16 46 55
Indirect/allocated expenses 83 80 244 245
Total noninterest expense 140 140 426 436
Income (loss) before income taxes 98 69 249 213
Total average loans 15,230 14,762 15,026 14,792
Total average deposits 21,108 21,386 21,048 21,010
CB&T | Operating Segments        
Segment Reporting Information [Line Items]        
Net interest income 168 155 481 448
Provision for credit losses 55 0 47 17
Net interest income after provision for credit losses 113 155 434 431
Noninterest income 31 31 91 87
Salaries and employee benefits 34 31 101 95
Technology, telecom, and information processing 1 1 4 4
Occupancy and equipment, net 9 8 25 24
Other direct expenses 10 9 31 32
Indirect/allocated expenses 56 50 162 149
Total noninterest expense 110 99 323 304
Income (loss) before income taxes 34 87 202 214
Total average loans 15,255 14,315 15,037 14,203
Total average deposits 15,656 14,643 15,166 14,530
Amegy | Operating Segments        
Segment Reporting Information [Line Items]        
Net interest income 143 128 412 355
Provision for credit losses 2 4 15 22
Net interest income after provision for credit losses 141 124 397 333
Noninterest income 49 44 140 128
Salaries and employee benefits 28 27 87 82
Technology, telecom, and information processing 2 2 6 6
Occupancy and equipment, net 8 8 25 24
Other direct expenses 12 12 37 42
Indirect/allocated expenses 66 62 193 186
Total noninterest expense 116 111 348 340
Income (loss) before income taxes 74 57 189 121
Total average loans 14,317 13,531 14,144 13,331
Total average deposits 14,559 14,633 14,647 14,705
NBAZ | Operating Segments        
Segment Reporting Information [Line Items]        
Net interest income 66 63 194 185
Provision for credit losses (3) 7 (15) 11
Net interest income after provision for credit losses 69 56 209 174
Noninterest income 12 11 31 31
Salaries and employee benefits 13 13 40 40
Technology, telecom, and information processing 1 1 3 3
Occupancy and equipment, net 3 3 8 8
Other direct expenses 6 7 20 21
Indirect/allocated expenses 26 25 77 76
Total noninterest expense 49 49 148 148
Income (loss) before income taxes 32 18 92 57
Total average loans 5,545 5,647 5,606 5,631
Total average deposits 6,863 6,904 6,891 6,897
NSB | Operating Segments        
Segment Reporting Information [Line Items]        
Net interest income 54 52 160 150
Provision for credit losses (6) (14) (2) (12)
Net interest income after provision for credit losses 60 66 162 162
Noninterest income 13 12 38 40
Salaries and employee benefits 11 11 34 35
Technology, telecom, and information processing 2 1 4 4
Occupancy and equipment, net 3 3 8 8
Other direct expenses 5 6 14 16
Indirect/allocated expenses 24 23 71 70
Total noninterest expense 45 44 131 133
Income (loss) before income taxes 28 34 69 69
Total average loans 3,736 3,520 3,711 3,525
Total average deposits 7,038 7,156 7,112 7,187
Vectra | Operating Segments        
Segment Reporting Information [Line Items]        
Net interest income 35 38 106 109
Provision for credit losses (6) 2 3 (4)
Net interest income after provision for credit losses 41 36 103 113
Noninterest income 9 7 28 20
Salaries and employee benefits 10 10 30 30
Technology, telecom, and information processing 1 1 2 2
Occupancy and equipment, net 3 3 9 9
Other direct expenses 4 3 10 11
Indirect/allocated expenses 16 17 51 52
Total noninterest expense 34 34 102 104
Income (loss) before income taxes 16 9 29 29
Total average loans 3,825 4,106 3,872 4,078
Total average deposits 3,396 3,531 3,400 3,486
TCBW | Operating Segments        
Segment Reporting Information [Line Items]        
Net interest income 18 16 52 45
Provision for credit losses 4 3 2 6
Net interest income after provision for credit losses 14 13 50 39
Noninterest income 2 2 6 6
Salaries and employee benefits 3 3 10 9
Technology, telecom, and information processing 1 0 1 1
Occupancy and equipment, net 1 1 2 2
Other direct expenses 1 1 4 4
Indirect/allocated expenses 4 3 11 8
Total noninterest expense 10 8 28 24
Income (loss) before income taxes 6 7 28 21
Total average loans 2,012 1,833 1,999 1,772
Total average deposits $ 1,139 $ 1,148 $ 1,140 $ 1,126