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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Statement of Comprehensive Income [Abstract]        
Net income $ 89,311 $ 76,467 $ 260,485 $ 214,555
Less: Net income (loss) attributable to noncontrolling interest 15 18 (36) (116)
Net income attributable to WSFS 89,296 76,449 260,521 214,671
Net change in unrealized (losses) gains on investment securities available-for-sale        
Net unrealized (losses) gains arising during the period, net of tax (benefit) expense of $(39,346), $14,019, $(44,834), and $43,301, respectively (124,595) 44,395 (141,975) 137,120
Net change in securities held-to-maturity        
Amortization of net unrealized losses on available-for-sale securities reclassified to held-to-maturity, net of tax expense of $957, $1,063, $2,779, and $3,103, respectively 3,028 3,370 8,799 9,825
Net change in unfunded post-retirement liability        
Change in unfunded post-retirement liability related to unrealized gain and prior service cost, net of tax benefit of $27, $20, $237, and $58, respectively (87) (62) (750) (184)
Net change in cash flow hedge        
Net unrealized (loss) gain arising during the period, net of tax (benefit) expense of $(3,025), $(68), $(5,656), and $1,295, respectively (9,579) (215) (17,912) 4,100
Net change in equity method investments        
Net change in other comprehensive loss of equity method investments, net of tax benefit of $3, $7, $26, and $213, respectively (9) (21) (81) (673)
Total other comprehensive (loss) income (131,242) 47,467 (151,919) 150,188
Total comprehensive (loss) income $ (41,946) $ 123,916 $ 108,602 $ 364,859