FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Condensed Financial Information Disclosure [Abstract]
Reserve for unfunded commitments	$ 1.3	$ 4.4

Concentration Risk, Credit Risk, Financial Instrument Commitments To Extend Credit, Reserve For Unfunded Amounts

No definition available.

Name:	sasr_ConcentrationRiskCreditRiskFinancialInstrumentCommitmentsToExtendCreditReserveForUnfundedAmounts
Namespace Prefix:	sasr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant