v3.26.1
Schedule of Assets (Held at End of Year) (Details) - EBP 002
12 Months Ended
Dec. 31, 2025
USD ($)
vote
EBP, Schedule of Asset Held for Investment [Line Items]  
EIN 23-2790930
Plan Number 002
Loans to participants $ 4,505,570
Total $ 276,470,716
Number of loans outstanding | vote 545
Minimum  
EBP, Schedule of Asset Held for Investment [Line Items]  
Loans to participants, interest rate 3.25%
Maximum  
EBP, Schedule of Asset Held for Investment [Line Items]  
Loans to participants, interest rate 9.50%
Investment, Identifier [Axis]: American Century | American Century In Retirement Trust Class III  
EBP, Schedule of Asset Held for Investment [Line Items]  
Investment $ 23,583,664
Investment, Identifier [Axis]: American Century | American Century Retirement Date 2030 Trust Class III  
EBP, Schedule of Asset Held for Investment [Line Items]  
Investment 24,064,829
Investment, Identifier [Axis]: American Century | American Century Retirement Date 2035 Trust Class III  
EBP, Schedule of Asset Held for Investment [Line Items]  
Investment 25,323,546
Investment, Identifier [Axis]: American Century | American Century Retirement Date 2040 Trust Class III  
EBP, Schedule of Asset Held for Investment [Line Items]  
Investment 15,027,760
Investment, Identifier [Axis]: American Century | American Century Retirement Date 2045 Trust Class III  
EBP, Schedule of Asset Held for Investment [Line Items]  
Investment 14,542,105
Investment, Identifier [Axis]: American Century | American Century Retirement Date 2050 Trust Class III  
EBP, Schedule of Asset Held for Investment [Line Items]  
Investment 13,445,088
Investment, Identifier [Axis]: American Century | American Century Retirement Date 2055 Trust Class III  
EBP, Schedule of Asset Held for Investment [Line Items]  
Investment 7,623,951
Investment, Identifier [Axis]: American Century | American Century Retirement Date 2060 Trust Class III  
EBP, Schedule of Asset Held for Investment [Line Items]  
Investment 3,490,984
Investment, Identifier [Axis]: American Century | American Century Retirement Date 2065 Trust Class III  
EBP, Schedule of Asset Held for Investment [Line Items]  
Investment 1,366,309
Investment, Identifier [Axis]: Diamond Hill | Diamond Hill Large Cap Fund Class Y  
EBP, Schedule of Asset Held for Investment [Line Items]  
Investment 3,535,171
Investment, Identifier [Axis]: Dimensional Fund Advisors | DFA International Core Equity Portfolio International Class  
EBP, Schedule of Asset Held for Investment [Line Items]  
Investment 2,907,248
Investment, Identifier [Axis]: Federal Investors, Inc. | Federated Hermes Total Return Bond Fund Institutional Shares  
EBP, Schedule of Asset Held for Investment [Line Items]  
Investment 5,355,974
Investment, Identifier [Axis]: Federated Investors, Inc. | Federated Hermes Prime Cash Obligation Fund Wealth  
EBP, Schedule of Asset Held for Investment [Line Items]  
Investment 11,667,019
Investment, Identifier [Axis]: Harding International | Harding Loevner International Equity Portfolio International Class  
EBP, Schedule of Asset Held for Investment [Line Items]  
Investment 1,854,086
Investment, Identifier [Axis]: JPMorgan | JPMorgan Emerging Markets Equity Fund Class L  
EBP, Schedule of Asset Held for Investment [Line Items]  
Investment 3,193,417
Investment, Identifier [Axis]: JPMorgan | Undiscovered Managers Behavioral Value Fund Class L  
EBP, Schedule of Asset Held for Investment [Line Items]  
Investment 1,631,229
Investment, Identifier [Axis]: Northwest Bancshares, Inc. | Northwest Bancshares, Inc. common stock  
EBP, Schedule of Asset Held for Investment [Line Items]  
Investment 44,010,120
Investment, Identifier [Axis]: T. Rowe Price | T. Rowe Price Blue Chip Growth Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
Investment 21,495,462
Investment, Identifier [Axis]: T. Rowe Price | T. Rowe Price Integrated U.S. Small-Cap Growth Equity Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
Investment 5,107,629
Investment, Identifier [Axis]: T. Rowe Price | T. Rowe Price Mid-Cap Growth Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
Investment 7,470,045
Investment, Identifier [Axis]: The Vanguard Group | Vanguard 500 Index Fund Admiral Shares  
EBP, Schedule of Asset Held for Investment [Line Items]  
Investment 20,464,250
Investment, Identifier [Axis]: The Vanguard Group | Vanguard Short Term Investment-Grade Fund Admiral Shares  
EBP, Schedule of Asset Held for Investment [Line Items]  
Investment 2,604,621
Investment, Identifier [Axis]: The Vanguard Group | Vanguard Total Stock Market Index Fund Admiral Shares  
EBP, Schedule of Asset Held for Investment [Line Items]  
Investment 9,291,937
Investment, Identifier [Axis]: Victory Capital | Victory Sycamore Established Fund Class R6  
EBP, Schedule of Asset Held for Investment [Line Items]  
Investment 2,908,702
Mutual funds  
EBP, Schedule of Asset Held for Investment [Line Items]  
Investment 87,819,771
Collective investment trusts  
EBP, Schedule of Asset Held for Investment [Line Items]  
Investment $ 128,468,236