Quarterly report [Sections 13 or 15(d)]

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

v3.26.1
Derivative Financial Instruments - Schedule of Non-hedging Derivative Financial Instruments (Details) - Not Designated as Hedging Instrument - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Derivative [Line Items]          
Notional or contractual amount $ 102,194   $ 102,194   $ 99,214
Asset derivatives 3,468   3,468   3,691
Liability derivatives 3,403   3,403   3,641
Derivatives, not designated as hedging instruments, gain (loss) 34 $ 19 96 $ (46)  
Interest rate swap contracts          
Derivative [Line Items]          
Notional or contractual amount 98,361   98,361   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) 0 0 81 (30)  
Interest rate swap contracts | Location, Statement of Financial Position, Balance [Axis]: us-gaap:AccruedLiabilitiesAndOtherLiabilities          
Derivative [Line Items]          
Liability derivatives 3,403   3,403   3,641
Interest rate swap contracts | Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAssets          
Derivative [Line Items]          
Asset derivatives 3,403   3,403   3,641
Interest rate lock commitments          
Derivative [Line Items]          
Notional or contractual amount 3,833   3,833   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) 34 $ 19 15 $ (16)  
Interest rate lock commitments | Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAssets          
Derivative [Line Items]          
Asset derivatives $ 65   $ 65   $ 50