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Operating Segment Information
 12 Months Ended
Dec. 31, 2023
Segment Reporting [Abstract]  
OPERATING SEGMENT INFORMATION OPERATING SEGMENT INFORMATION
We manage our operations with a primary focus on geographic area. We conduct our operations primarily through seven separately managed affiliate banks, each with its own local branding and management team, including Zions Bank, Amegy Bank, California Bank & Trust, National Bank of Arizona, Nevada State Bank, Vectra Bank Colorado, and The Commerce Bank of Washington. These affiliate banks comprise our primary business segments. Performance assessment and resource allocation are based upon this geographic structure. Our affiliate banks are supported by an enterprise operating segment (referred to as the “Other” segment) that provides governance and risk management, allocates capital, establishes strategic objectives, and includes centralized technology, back-office functions, and certain lines of business not operated through our affiliate banks.
We allocate the cost of centrally provided services to the business segments based upon estimated or actual usage of those services. We also allocate capital based on the risk-weighted assets held at each business segment. We use an internal funds transfer pricing (“FTP”) allocation process to report results of operations for business segments. This process is subject to change and refinement over time. Total average loans and deposits presented for the business segments include insignificant intercompany amounts between business segments and may also include deposits with the “Other” segment.
At December 31, 2023, Zions Bank operated 95 branches in Utah, 25 branches in Idaho, and one branch in Wyoming. CB&T operated 75 branches in California. Amegy operated 75 branches in Texas. NBAZ operated 56 branches in Arizona. NSB operated 43 branches in Nevada. Vectra operated 33 branches in Colorado and one branch in New Mexico. TCBW operated two branches in Washington and one branch in Oregon.
In July 2022, NSB completed the purchase of three Northern Nevada City National Bank branches and their associated deposit, credit card, and loan accounts. We acquired approximately $430 million in deposits and $95 million in commercial and consumer loans at the time of the purchase.
Transactions between business segments are primarily conducted at fair value, resulting in profits that are eliminated for reporting consolidated results of operations. The following schedule presents average loans, average deposits, and income before income taxes because we use these metrics when evaluating performance and making decisions pertaining to the business segments. The condensed statement of income identifies the components of income and expense which affect the operating amounts presented in the “Other” segment.
The following schedule presents selected operating segment information:
(In millions)Zions BankCB&TAmegy
202320222021202320222021202320222021
SELECTED INCOME STATEMENT DATA
Net interest income$696 $741 $633 $598 $595 $536 $453 $513 $462 
Provision for credit losses20 43 (26)44 49 (78)15 5 (96)
Net interest income after provision for credit losses
676 698 659 554 546 614 438 508 558 
Noninterest income192 184 185 116 108 102 184 158 141 
Noninterest expense557 495 464 388 340 311 404 355 337 
Income (loss) before income taxes$311 $387 $380 $282 $314 $405 $218 $311 $362 
SELECTED AVERAGE BALANCE SHEET DATA
Total average loans$14,298 $13,277 $13,198 $14,128 $13,129 $12,892 $12,851 $12,110 $12,189 
Total average deposits20,233 24,317 23,588 14,253 16,160 15,796 13,569 15,735 15,496 
(In millions)NBAZNSBVectra
202320222021202320222021202320222021
SELECTED INCOME STATEMENT DATA
Net interest income$260 $241 $204 $191 $183 $146 $150 $153 $136 
Provision for credit losses4 11 (27)42 4 (35)7 9 (12)
Net interest income after provision for credit losses
256 230 231 149 179 181 143 144 148 
Noninterest income40 48 46 45 48 50 28 31 33 
Noninterest expense189 167 151 171 151 142 137 120 114 
Income (loss) before income taxes$107 $111 $126 $23 $76 $89 $34 $55 $67 
SELECTED AVERAGE BALANCE SHEET DATA
Total average loans$5,318 $4,911 $4,849 $3,392 $2,987 $3,015 $4,004 $3,632 $3,414 
Total average deposits7,008 8,035 7,288 6,964 7,436 6,691 3,482 4,109 4,386 
(In millions)TCBWOtherConsolidated Bank
202320222021202320222021202320222021
SELECTED INCOME STATEMENT DATA
Net interest income$60 $63 $53 $30 $31 $38 $2,438 $2,520 $2,208 
Provision for credit losses2 1 (3)(2)— 1 132 122 (276)
Net interest income after provision for credit losses
58 62 56 32 31 37 2,306 2,398 2,484 
Noninterest income7 7 6 65 48 140 677 632 703 
Noninterest expense27 24 21 224 226 201 2,097 1,878 1,741 
Income (loss) before income taxes$38 $45 $41 $(127)$(147)$(24)$886 $1,152 $1,446 
SELECTED AVERAGE BALANCE SHEET DATA
Total average loans$1,705 $1,630 $1,569 $1,044 $922 $857 $56,740 $52,598 $51,983 
Total average deposits1,196 1,571 1,537 6,161 1,166 1,475 72,866 78,529 76,257