Cover - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2022

Feb. 17, 2023

Jun. 30, 2022

Cover [Abstract]

Document Type

10-K

Document Annual Report

true

Document Period End Date

Dec. 31, 2022

Current Fiscal Year End Date

--12-31

Document Transition Report

false

Entity File Number

001-34582

Entity Registrant Name

NORTHWEST BANCSHARES, INC.

Entity Incorporation, State or Country Code

MD

Entity Tax Identification Number

27-0950358

Entity Address, Address Line One

3 Easton Oval,

Entity Address, City or Town

Columbus,

Entity Address, State or Province

OH

Entity Address, Postal Zip Code

43219

City Area Code

814

Local Phone Number

726-2140

Title of 12(b) Security

Common Stock, $0.01 Par Value

Trading Symbol

NWBI

Security Exchange Name

NASDAQ

Entity Well-known Seasoned Issuer

Yes

Entity Voluntary Filers

No

Entity Current Reporting Status

Yes

Entity Interactive Data Current

Yes

Entity Filer Category

Large Accelerated Filer

Entity Small Business

false

Entity Emerging Growth Company

false

ICFR Auditor Attestation Flag

true

Entity Shell Company

false

Entity Common Stock, Shares Outstanding

127,047,704

Entity Public Float

$ 1,624

Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE 

Proxy Statement for the 2023 Annual Meeting of Stockholders of the Registrant (Part III).

Entity Central Index Key

0001471265

Document Fiscal Year Focus

2022

Document Fiscal Period Focus

FY

Amendment Flag

false