Quarterly report [Sections 13 or 15(d)]

Derivative Financial Instruments - Schedule of Non-hedging Derivative Financial Instruments (Details)

v3.26.3
Derivative Financial Instruments - Schedule of Non-hedging Derivative Financial Instruments (Details) - Not Designated as Hedging Instrument - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Derivative [Line Items]          
Notional or contractual amount $ 106,165   $ 106,165   $ 99,214
Asset derivatives 5,741   5,741   3,691
Liability derivatives 5,701   5,701   3,641
Derivatives, not designated as hedging instruments, gain (loss) (19) $ 153 77 $ 107  
Interest rate swap contracts          
Derivative [Line Items]          
Notional or contractual amount 103,786   103,786   96,275
Interest rate swap contracts | Location, Statement of Income, Balance [Axis]: fnwd:FeesAndServiceCharges          
Derivative [Line Items]          
Derivatives, not designated as hedging instruments, gain (loss) 5 170 86 140  
Interest rate swap contracts | Location, Statement of Financial Position, Balance [Axis]: us-gaap:AccruedLiabilitiesAndOtherLiabilities          
Derivative [Line Items]          
Liability derivatives 5,701   5,701   3,641
Interest rate swap contracts | Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAssets          
Derivative [Line Items]          
Asset derivatives 5,701   5,701   3,641
Interest rate lock commitments          
Derivative [Line Items]          
Notional or contractual amount 2,379   2,379   2,939
Interest rate lock commitments | Location, Statement of Income, Balance [Axis]: fnwd:GainLossOnSalesOfLoansIncludingDerivativesNet          
Derivative [Line Items]          
Derivatives, not designated as hedging instruments, gain (loss) (24) $ (17) (9) $ (33)  
Interest rate lock commitments | Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAssets          
Derivative [Line Items]          
Asset derivatives $ 40   $ 40   $ 50