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Derivative Financial Instruments (Fair Value of Derivatives by Balance Sheet Location) (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Derivatives, Fair Value [Line Items]    
Accrued interest receivable $ 19,400 $ 20,100
Interest rate swaps | Derivatives Designated as Hedging Instruments    
Derivatives, Fair Value [Line Items]    
Accrued interest receivable 23 35
Accrued interest payable 53 23
Interest rate swaps | Derivatives Designated as Hedging Instruments | Cash Flow Hedging Instruments    
Derivatives, Fair Value [Line Items]    
Notional amount 120,000 120,000
Interest rate cash flow hedge asset at fair value [1] 770 126
Interest rate cash flow hedge liability at fair value [1] 170 979
Notional amount of interest rate collar that matured 120,000 120,000
Interest rate swaps | Derivatives Designated as Hedging Instruments | Fair Value Hedging Instruments    
Derivatives, Fair Value [Line Items]    
Notional amount 100,000 100,000
Interest rate fair value hedge asset at fair value 1,503 335
Interest rate fair value hedge liability at fair value 0 0
Notional amount of interest rate collar that matured 100,000 100,000
Interest rate collars | Cash Flow Hedging Instruments    
Derivatives, Fair Value [Line Items]    
Notional amount 50,000  
Notional amount of interest rate collar that matured 50,000  
Interest rate collars | Derivatives Designated as Hedging Instruments | Cash Flow Hedging Instruments    
Derivatives, Fair Value [Line Items]    
Notional amount 50,000 100,000
Interest rate cash flow hedge asset at fair value 20 0
Interest rate cash flow hedge liability at fair value 0 17
Notional amount of interest rate collar that matured 50,000 100,000
Interest rate floors | Derivatives Designated as Hedging Instruments | Cash Flow Hedging Instruments    
Derivatives, Fair Value [Line Items]    
Notional amount 200,000 200,000
Interest rate cash flow hedge asset at fair value 33 125
Interest rate cash flow hedge liability at fair value 0 0
Notional amount of interest rate collar that matured 200,000 200,000
Interest rate contracts with customers | Derivatives Not Designated as Hedging Instruments    
Derivatives, Fair Value [Line Items]    
Notional amount 897,320 882,941
Derivative assets not designated as hedging instruments 3,053 6,326
Derivative liabilities not designated as hedging instruments 32,189 27,959
Notional amount of interest rate collar that matured 897,320 882,941
Mirror interest rate contracts with counterparties | Derivatives Not Designated as Hedging Instruments    
Derivatives, Fair Value [Line Items]    
Notional amount 897,320 882,941
Derivative assets not designated as hedging instruments 32,090 27,857
Derivative liabilities not designated as hedging instruments 3,118 6,392
Notional amount of interest rate collar that matured 897,320 882,941
Risk participation agreements | Derivatives Not Designated as Hedging Instruments    
Derivatives, Fair Value [Line Items]    
Notional amount 311,701 304,854
Derivative assets not designated as hedging instruments 50 28
Derivative liabilities not designated as hedging instruments 0 1
Notional amount of interest rate collar that matured 311,701 304,854
Interest rate lock commitments | Derivatives Not Designated as Hedging Instruments    
Derivatives, Fair Value [Line Items]    
Notional amount 57,294 30,373
Derivative assets not designated as hedging instruments 1,102 603
Derivative liabilities not designated as hedging instruments 12 12
Notional amount of interest rate collar that matured 57,294 30,373
Forward sale commitments | Derivatives Not Designated as Hedging Instruments    
Derivatives, Fair Value [Line Items]    
Notional amount 93,612 90,813
Derivative assets not designated as hedging instruments 62 13
Derivative liabilities not designated as hedging instruments 921 828
Notional amount of interest rate collar that matured 93,612 90,813
Derivative assets    
Derivatives, Fair Value [Line Items]    
Gross derivative assets 38,683 35,413
Less: derivative asset amounts offset [2] 3,288 6,643
Derivative asset balances, net of offset 35,395 28,770
Less: collateral pledged, derivative assets [3] 0 0
Net amounts 35,395 28,770
Derivative liabilities    
Derivatives, Fair Value [Line Items]    
Gross derivative liabilities 36,410 36,188
Less: derivative liability amounts offset [2] 3,288 6,643
Derivative liability balances, net of offset 33,122 29,545
Less: collateral pledged, derivative liabilities [3] 0 0
Net amounts $ 33,122 $ 29,545
[1] The fair value of derivative assets includes accrued interest receivable of $23 thousand and $35 thousand, respectively, at June 30, 2026 and December 31, 2025. The fair value of derivative liabilities includes accrued interest payable of $53 thousand and $23 thousand, respectively, at June 30, 2026 and December 31, 2025.
[2] Interest rate risk management contracts and loan related derivative contracts with counterparties are subject to master netting arrangements.
[3] Collateral contractually required to be pledged to derivative counterparties is in the form of cash. Washington Trust may need to post additional collateral in the future in proportion to potential increases in unrealized loss positions.