Operating Segment Information (Tables)

12 Months Ended

Dec. 31, 2019

Operating Segment Information [Abstract]

Schedule of Segment Reporting Information, by Segment

(In millions)	Zions Bank						Amegy						CB&T
	2019		2018		2017		2019		2018		2017		2019		2018		2017
SELECTED INCOME STATEMENT DATA
Net interest income	$	703	$	673	$	605	$	497	$	491	$	453	$	522	$	513	$	455
Provision for credit losses	18		8		20		9		(80)		20		7		15		(5)
Net interest income after provision for credit losses	685		665		585		488		571		433		515		498		460
Noninterest income	150		150		148		138		126		116		88		82		75
Noninterest expense	471		462		432		344		344		340		316		308		299
Income before income taxes	$	364	$	353	$	301	$	282	$	353	$	209	$	287	$	272	$	236
SELECTED AVERAGE BALANCE SHEET DATA
Total average loans	$	13,109	$	12,643	$	12,481	$	12,235	$	11,358	$	11,021	$	10,763	$	10,033	$	9,539
Total average deposits	15,870		15,410		15,986		11,627		11,160		11,096		11,522		11,268		11,030
(In millions)	NBAZ						NSB						Vectra
	2019		2018		2017		2019		2018		2017		2019		2018		2017
SELECTED INCOME STATEMENT DATA
Net interest income	$	227	$	218	$	191	$	153	$	144	$	123	$	137	$	131	$	121
Provision for credit losses	2		8		(8)		(1)		1		(11)		3		6		1
Net interest income after provision for credit losses	225		210		199		154		143		134		134		125		120
Noninterest income	42		39		39		43		41		39		26		24		25
Noninterest expense	156		152		148		145		143		138		108		105		101
Income before income taxes	$	111	$	97	$	90	$	52	$	41	$	35	$	52	$	44	$	44
SELECTED AVERAGE BALANCE SHEET DATA
Total average loans	$	4,774	$	4,608	$	4,267	$	2,630	$	2,394	$	2,357	$	3,109	$	2,924	$	2,644
Total average deposits	5,002		4,931		4,762		4,512		4,286		4,254		2,853		2,761		2,756

(In millions)	TCBW						Other						Consolidated Bank
	2019		2018		2017		2019		2018		2017		2019		2018		2017
SELECTED INCOME STATEMENT DATA
Net interest income	$	54	$	53	$	44	$	(21)	$	7	$	73	$	2,272	$	2,230	$	2,065
Provision for credit losses	(1)		2		2		2		—		(2)		39		(40)		17
Net interest income after provision for credit losses	55		51		42		(23)		7		75		2,233		2,270		2,048
Noninterest income	5		5		5		70		85		97		562		552		544
Noninterest expense	22		22		20		180		143		178		1,742		1,679		1,656
Income (loss) before income taxes	$	38	$	34	$	27	$	(133)	$	(51)	$	(6)	$	1,053	$	1,143	$	936
SELECTED AVERAGE BALANCE SHEET DATA
Total average loans	$	1,194	$	1,118	$	926	$	451	$	347	$	266	$	48,265	$	45,425	$	43,501
Total average deposits	1,094		1,092		1,107		2,600		2,275		1,209		55,080		53,183		52,200