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Operating Segment Information
 9 Months Ended
Sep. 30, 2019
Operating Segment Information [Abstract]  
Operating Segment Information OPERATING SEGMENT INFORMATION
We manage our operations and prepare management reports and other information with a primary focus on geographical area. Our banking operations are managed under their own individual brand names, including Zions Bank, Amegy Bank, California Bank & Trust, National Bank of Arizona, Nevada State Bank, Vectra Bank Colorado, and The Commerce Bank of Washington. Performance assessment and resource allocation are based upon this geographical structure. We use an internal funds transfer pricing (“FTP”) allocation system to report results of operations for business segments. This process is continually refined. In the third quarter of 2019, we made changes to the FTP process to more accurately reflect the cost of funds for loans. Prior period amounts have been revised to reflect the impact of these changes had they been instituted for the periods presented. Total average loans and deposits presented for the banking segments include insignificant intercompany amounts between banking segments and may also include deposits with the Other segment.
As of September 30, 2019, our banking business is conducted through 7 locally managed and branded segments in distinct geographical areas. Zions Bank operates 98 branches in Utah, 24 branches in Idaho, and one branch in Wyoming. Amegy operates 75 branches in Texas. CB&T operates 87 branches in California. NBAZ operates 58 branches in Arizona. NSB operates 50 branches in Nevada. Vectra operates 36 branches in Colorado and one branch in New Mexico. TCBW operates two branches in Washington and one branch in Oregon.
The operating segment identified as “Other” includes certain non-bank financial service subsidiaries, centralized back-office functions, and eliminations of transactions between segments. The major components of net interest income at the Bank’s back-office include the revenue associated with the investments securities portfolio and the offset of the FTP costs and benefits provided to the business segments.
The following schedule does not present total assets or income tax expense for each operating segment, but instead presents average loans, average deposits and income before income taxes because these are the metrics that management uses when evaluating performance and making decisions pertaining to the operating segments. The Bank’s net interest income includes interest expense on borrowed funds. The condensed statement of income identifies the components of income and expense which affect the operating amounts presented in the Other segment.
The accounting policies of the individual operating segments are the same as those of the Bank. Transactions between operating segments are primarily conducted at fair value, resulting in profits that are eliminated for reporting consolidated results of operations.
The following schedule presents selected operating segment information for the three months ended September 30, 2019 and 2018:
Zions BankAmegyCB&T
(In millions)201920182019201820192018
SELECTED INCOME STATEMENT DATA
Net interest income$177  $171  $126  $126  $130  $132  
Provision for credit losses1  2  18  (18) (6) 3  
Net interest income after provision for credit losses
176  169  108  144  136  129  
Noninterest income40  38  37  31  23  19  
Noninterest expense114  118  84  86  75  77  
Income (loss) before income taxes
$102  $89  $61  $89  $84  $71  
SELECTED AVERAGE BALANCE SHEET DATA
Total average loans$13,229  $12,607  $12,438  $11,328  $10,819  $9,985  
Total average deposits15,983  15,385  11,842  11,185  11,565  11,335  
NBAZ  NSBVectra
(In millions)201920182019201820192018
SELECTED INCOME STATEMENT DATA
Net interest income$57  $56  $39  $37  $34  $33  
Provision for credit losses—  (1) 1  1  (3) 1  
Net interest income after provision for credit losses
57  57  38  36  37  32  
Noninterest income10  10  11  10  7  6  
Noninterest expense39  39  35  35  27  26  
Income (loss) before income taxes
$28  $28  $14  $11  $17  $12  
SELECTED AVERAGE BALANCE SHEET DATA
Total average loans$4,769  $4,591  $2,708  $2,408  $3,161  $2,969  
Total average deposits5,028  5,008  4,547  4,302  2,866  2,789  
TCBW  OtherConsolidated Bank
(In millions)201920182019201820192018
SELECTED INCOME STATEMENT DATA
Net interest income$13  $13  $(9) $(3) $567  $565  
Provision for credit losses(2) —  1  1  10  (11) 
Net interest income after provision for credit losses
15  13  (10) (4) 557  576  
Noninterest income1  1  17  21  146  136  
Noninterest expense5  5  36  34  415  420  
Income (loss) before income taxes
$11  $9  $(29) $(17) $288  $292  
SELECTED AVERAGE BALANCE SHEET DATA
Total average loans$1,235  $1,136  $469  $344  $48,828  $45,368  
Total average deposits1,097  1,086  2,356  2,485  55,284  53,575  
The following schedule presents selected operating segment information for the nine months ended September 30, 2019 and 2018:
Zions BankAmegyCB&T
(In millions)201920182019201820192018
SELECTED INCOME STATEMENT DATA
Net interest income$528  $496  $375  $366  $395  $381  
Provision for credit losses27  5  (5) (77) 6  8  
Net interest income after provision for credit losses
501  491  380  443  389  373  
Noninterest income112  111  105  95  63  59  
Noninterest expense351  348  258  258  239  230  
Income (loss) before income taxes
$262  $254  $227  $280  $213  $202  
SELECTED AVERAGE BALANCE SHEET DATA
Total average loans$13,079  $12,565  $12,186  $11,362  $10,745  $9,941  
Total average deposits15,656  15,847  11,549  11,022  11,408  11,213  
NBAZ  NSBVectra
(In millions)201920182019201820192018
SELECTED INCOME STATEMENT DATA
Net interest income$173  $161  $115  $106  $103  $96  
Provision for credit losses5  8  —  1  3  6  
Net interest income after provision for credit losses
168  153  115  105  100  90  
Noninterest income31  29  32  30  19  18  
Noninterest expense116  114  109  107  82  78  
Income (loss) before income taxes
$83  $68  $38  $28  $37  $30  
SELECTED AVERAGE BALANCE SHEET DATA
Total average loans$4,788  $4,591  $2,594  $2,369  $3,107  $2,882  
Total average deposits4,990  4,912  4,428  4,280  2,833  2,762  
TCBW  OtherConsolidated Bank
(In millions)201920182019201820192018
SELECTED INCOME STATEMENT DATA
Net interest income$41  $36  $(17) $12  $1,713  $1,654  
Provision for credit losses—  2  (1) 1  35  (46) 
Net interest income after provision for credit losses
41  34  (16) 11  1,678  1,700  
Noninterest income4  4  44  66  410  412  
Noninterest expense17  16  98  108  1,270  1,259  
Income (loss) before income taxes
$28  $22  $(70) $(31) $818  $853  
SELECTED AVERAGE BALANCE SHEET DATA
Total average loans$1,183  $1,113  $432  $336  $48,114  $45,159  
Total average deposits1,075  1,069  2,582  1,722  54,521  52,827