DOCUMENT AND ENTITY INFORMATION - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2019

Feb. 19, 2020

Jun. 30, 2019

Document And Entity Information [Abstract]

Document Type

10-K

Document Annual Report

true

Amendment Flag

false

Document Period End Date

Dec. 31, 2019

Document Fiscal Year Focus

2019

Document Fiscal Period Focus

FY

Entity File Number

0-19065

Entity Registrant Name

SANDY SPRING BANCORP, INC.

Entity Incorporation State Country Code

MD

Entity Tax Identification Number

52-1532952

Entity Address, Address Line One

17801 Georgia Avenue

Entity Address, City or Town

Olney

Entity Address, State or Province

MD

Entity Address, Postal Zip Code

20832

City Area Code

301

Local Phone Number

774-6400

Title of 12(b) Security

Common Stock, par value $1.00 per share

Trading Symbol

SASR

Security Exchange Name

NASDAQ

Entity Well-known Seasoned Issuer

No

Entity Voluntary Filers

No

Entity Current Reporting Status

Yes

Entity Interactive Data Current

Yes

Entity Filer Category

Large Accelerated Filer

Document Transition Report

false

Entity Central Index Key

0000824410

Current Fiscal Year End Date

--12-31

Entity Emerging Growth Company

false

Entity Shell Company

false

Entity Small Business

false

Entity Public Float

$ 1,210

Documents Incorporated by Reference [Text Block]

Documents Incorporated By Reference

Part III: Portions of the definitive proxy statement for the Annual Meeting of Shareholders to be held on June 4, 2020 (the "Proxy Statement").

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The registrant is required to file reports pursuant to Section 13 of the Act.

Entity Common Stock, Shares Outstanding

34,928,509