Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2013

Regulatory Capital Requirements [Abstract]

Summary Of Actual Capital Amounts And Ratios For The Company And Its Three Largest Subsidiary Banks

	Actual				To be well capitalized
(Amounts in thousands)	Amount		Ratio		Amount		Ratio
As of December 31, 2013:
Total capital (to risk-weighted assets)
The Company	$	6,621,539	14.67	%	$	4,514,553	10.00	%
Zions First National Bank	1,997,525		14.52		1,375,347		10.00
California Bank & Trust	1,252,860		13.65		917,950		10.00
Amegy Bank N.A.	1,714,314		14.86		1,153,382		10.00
Tier 1 capital (to risk-weighted assets)
The Company	5,763,463		12.77		2,708,732		6.00
Zions First National Bank	1,831,720		13.32		825,208		6.00
California Bank & Trust	1,137,848		12.40		550,770		6.00
Amegy Bank N.A.	1,569,696		13.61		692,029		6.00
Tier 1 capital (to average assets)
The Company	5,763,463		10.48		na		na 1
Zions First National Bank	1,831,720		10.02		913,592		5.00
California Bank & Trust	1,137,848		10.75		529,067		5.00
Amegy Bank N.A.	1,569,696		12.09		649,387		5.00

As of December 31, 2012:
Total capital (to risk-weighted assets)
The Company	$	6,616,521	15.05	%	$	4,396,983	10.00	%
Zions First National Bank	2,034,662		14.17		1,435,690		10.00
California Bank & Trust	1,222,822		14.18		862,218		10.00
Amegy Bank N.A.	1,598,708		15.17		1,054,110		10.00
Tier 1 capital (to risk-weighted assets)
The Company	5,883,669		13.38		2,638,190		6.00
Zions First National Bank	1,861,218		12.96		861,414		6.00
California Bank & Trust	1,114,315		12.92		517,331		6.00
Amegy Bank N.A.	1,466,001		13.91		632,466		6.00
Tier 1 capital (to average assets)
The Company	5,883,669		10.96		na		na 1
Zions First National Bank	1,861,218		10.58		879,719		5.00
California Bank & Trust	1,114,315		10.37		537,534		5.00
Amegy Bank N.A.	1,466,001		12.03		609,319		5.00