ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY INFORMATION - Schedule of Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans with no allowance	$ 35,042	$ 103,578
Property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of non accruing collateral-dependent loans	53,722	101,477
Equipment and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of non accruing collateral-dependent loans	8,080	20,704
Commercial \| Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans with no allowance	14,842	43,206
Commercial \| Commercial and industrial \| Discontinued Operations, Held-for-Sale
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans with no allowance	10,300
Commercial \| Commercial and industrial \| Property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of non accruing collateral-dependent loans	6,788	41,105
Commercial \| Commercial and industrial \| Equipment and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of non accruing collateral-dependent loans	8,054	20,704
Commercial \| Owner-occupied commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans with no allowance	6,502	4,710
Commercial \| Owner-occupied commercial \| Property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of non accruing collateral-dependent loans	6,502	4,710
Commercial \| Owner-occupied commercial \| Equipment and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of non accruing collateral-dependent loans	0	0
Commercial \| Commercial mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans with no allowance	3,145	22,223
Commercial \| Commercial mortgages \| Property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of non accruing collateral-dependent loans	3,145	22,223
Commercial \| Commercial mortgages \| Equipment and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of non accruing collateral-dependent loans	0	0
Commercial \| Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans with no allowance	2,621	25,600
Commercial \| Construction \| Property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of non accruing collateral-dependent loans	29,381	25,600
Commercial \| Construction \| Equipment and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of non accruing collateral-dependent loans	0	0
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans with no allowance	4,892	5,011
Residential \| Property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of non accruing collateral-dependent loans	4,892	5,011
Residential \| Equipment and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of non accruing collateral-dependent loans	0	0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans with no allowance	3,040	2,828
Consumer \| Property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of non accruing collateral-dependent loans	3,014	2,828
Consumer \| Equipment and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of non accruing collateral-dependent loans	$ 26	$ 0

WSFS FINANCIAL CORP 10-Q