Operating Segment Information (Tables)

12 Months Ended

Dec. 31, 2023

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

The following schedule presents selected operating segment information:

(In millions)	Zions Bank						CB&T						Amegy
	2023		2022		2021		2023		2022		2021		2023		2022		2021
SELECTED INCOME STATEMENT DATA
Net interest income	$	696	$	741	$	633	$	598	$	595	$	536	$	453	$	513	$	462
Provision for credit losses	20		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 income	192		184		185		116		108		102		184		158		141
Noninterest expense	557		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 deposits	20,233		24,317		23,588		14,253		16,160		15,796		13,569		15,735		15,496
(In millions)	NBAZ						NSB						Vectra
	2023		2022		2021		2023		2022		2021		2023		2022		2021
SELECTED INCOME STATEMENT DATA
Net interest income	$	260	$	241	$	204	$	191	$	183	$	146	$	150	$	153	$	136
Provision for credit losses	4		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 income	40		48		46		45		48		50		28		31		33
Noninterest expense	189		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 deposits	7,008		8,035		7,288		6,964		7,436		6,691		3,482		4,109		4,386
(In millions)	TCBW						Other						Consolidated Bank
	2023		2022		2021		2023		2022		2021		2023		2022		2021
SELECTED INCOME STATEMENT DATA
Net interest income	$	60	$	63	$	53	$	30	$	31	$	38	$	2,438	$	2,520	$	2,208
Provision for credit losses	2		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 income	7		7		6		65		48		140		677		632		703
Noninterest expense	27		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 deposits	1,196		1,571		1,537		6,161		1,166		1,475		72,866		78,529		76,257