v3.26.3
OPERATING SEGMENT INFORMATION (Schedule Of Segment Information) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Segment Reporting [Line Items]        
Net interest income $ 684 $ 672 $ 2,023 $ 1,944
Provision for credit losses (8) 49 (12) 66
Net interest income after provision for credit losses 692 623 2,035 1,878
Noninterest income 197 189 844 550
Salaries and employee benefits 345 337 1,050 1,015
Technology, telecom, and information processing 76 70 222 205
Occupancy and equipment, net 43 42 128 123
Other direct expenses 89 78 266 249
Indirect/allocated expenses 0 0 0 0
Total noninterest expense 553 527 1,666 1,592
Income (loss) before income taxes 336 285 1,213 836
Total average loans 62,441 60,786 61,814 60,298
Total average deposits 77,979 74,303 76,568 74,494
Other        
Segment Reporting [Line Items]        
Net interest income (3) (3) (5) (10)
Provision for credit losses 0 1 0 1
Net interest income after provision for credit losses (3) (4) (5) (11)
Noninterest income 22 24 324 75
Salaries and employee benefits 211 203 640 608
Technology, telecom, and information processing 65 59 191 174
Occupancy and equipment, net 8 8 26 26
Other direct expenses 40 28 120 87
Indirect/allocated expenses (292) (275) (869) (809)
Total noninterest expense 32 23 108 86
Income (loss) before income taxes (13) (3) 211 (22)
Total average loans 893 866 885 903
Total average deposits 4,502 4,544 4,515 5,090
Zions Bank | Operating Segments        
Segment Reporting [Line Items]        
Net interest income 194 191 563 549
Provision for credit losses 0 2 (7) 15
Net interest income after provision for credit losses 194 189 570 534
Noninterest income 57 49 156 141
Salaries and employee benefits 36 35 107 105
Technology, telecom, and information processing 4 3 11 11
Occupancy and equipment, net 7 7 21 20
Other direct expenses 11 12 39 46
Indirect/allocated expenses 87 83 260 244
Total noninterest expense 145 140 438 426
Income (loss) before income taxes 106 98 288 249
Total average loans 15,576 15,230 15,331 15,026
Total average deposits 21,540 21,108 21,208 21,048
CB&T | Operating Segments        
Segment Reporting [Line Items]        
Net interest income 164 168 491 481
Provision for credit losses (5) 55 (12) 47
Net interest income after provision for credit losses 169 113 503 434
Noninterest income 33 31 109 91
Salaries and employee benefits 33 34 102 101
Technology, telecom, and information processing 1 1 4 4
Occupancy and equipment, net 9 9 27 25
Other direct expenses 11 10 33 31
Indirect/allocated expenses 60 56 178 162
Total noninterest expense 114 110 344 323
Income (loss) before income taxes 88 34 268 202
Total average loans 15,590 15,255 15,478 15,037
Total average deposits 16,289 15,656 16,067 15,166
Amegy | Operating Segments        
Segment Reporting [Line Items]        
Net interest income 150 143 442 412
Provision for credit losses 3 2 4 15
Net interest income after provision for credit losses 147 141 438 397
Noninterest income 50 49 147 140
Salaries and employee benefits 28 28 86 87
Technology, telecom, and information processing 2 2 6 6
Occupancy and equipment, net 9 8 26 25
Other direct expenses 14 12 35 37
Indirect/allocated expenses 69 66 205 193
Total noninterest expense 122 116 358 348
Income (loss) before income taxes 75 74 227 189
Total average loans 14,884 14,317 14,749 14,144
Total average deposits 16,027 14,559 15,501 14,647
NBAZ | Operating Segments        
Segment Reporting [Line Items]        
Net interest income 69 66 203 194
Provision for credit losses (2) (3) 7 (15)
Net interest income after provision for credit losses 71 69 196 209
Noninterest income 12 12 38 31
Salaries and employee benefits 12 13 40 40
Technology, telecom, and information processing 1 1 3 3
Occupancy and equipment, net 3 3 9 8
Other direct expenses 5 6 12 20
Indirect/allocated expenses 28 26 83 77
Total noninterest expense 49 49 147 148
Income (loss) before income taxes 34 32 87 92
Total average loans 5,710 5,545 5,677 5,606
Total average deposits 7,231 6,863 7,136 6,891
NSB | Operating Segments        
Segment Reporting [Line Items]        
Net interest income 57 54 167 160
Provision for credit losses (3) (6) 1 (2)
Net interest income after provision for credit losses 60 60 166 162
Noninterest income 13 13 39 38
Salaries and employee benefits 11 11 34 34
Technology, telecom, and information processing 2 2 4 4
Occupancy and equipment, net 3 3 9 8
Other direct expenses 4 5 13 14
Indirect/allocated expenses 25 24 74 71
Total noninterest expense 45 45 134 131
Income (loss) before income taxes 28 28 71 69
Total average loans 3,819 3,736 3,789 3,711
Total average deposits 7,631 7,038 7,502 7,112
Vectra | Operating Segments        
Segment Reporting [Line Items]        
Net interest income 34 35 102 106
Provision for credit losses 0 (6) (3) 3
Net interest income after provision for credit losses 34 41 105 103
Noninterest income 9 9 25 28
Salaries and employee benefits 11 10 32 30
Technology, telecom, and information processing 1 1 2 2
Occupancy and equipment, net 3 3 8 9
Other direct expenses 3 4 10 10
Indirect/allocated expenses 17 16 53 51
Total noninterest expense 35 34 105 102
Income (loss) before income taxes 8 16 25 29
Total average loans 3,771 3,825 3,748 3,872
Total average deposits 3,578 3,396 3,502 3,400
TCBNW | Operating Segments        
Segment Reporting [Line Items]        
Net interest income 19 18 60 52
Provision for credit losses (1) 4 (2) 2
Net interest income after provision for credit losses 20 14 62 50
Noninterest income 1 2 6 6
Salaries and employee benefits 3 3 9 10
Technology, telecom, and information processing 0 1 1 1
Occupancy and equipment, net 1 1 2 2
Other direct expenses 1 1 4 4
Indirect/allocated expenses 6 4 16 11
Total noninterest expense 11 10 32 28
Income (loss) before income taxes 10 6 36 28
Total average loans 2,198 2,012 2,157 1,999
Total average deposits $ 1,181 $ 1,139 $ 1,137 $ 1,140