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Derivative Financial Instruments (Fair Value of Derivatives by Balance Sheet Location) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Interest rate caps [Member] | Designated as Hedging Instrument [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Interest rate cash flow hedge asset at fair value $ 0 $ 0
Interest rate caps [Member] | Designated as Hedging Instrument [Member] | Other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Interest rate cash flow hedge liability at fair value 0 0
Interest rate swaps [Member] | Designated as Hedging Instrument [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Interest rate cash flow hedge asset at fair value 0 0
Interest rate swaps [Member] | Designated as Hedging Instrument [Member] | Other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Interest rate cash flow hedge liability at fair value 1,958 730
Interest rate floors [Member] | Designated as Hedging Instrument [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Interest rate cash flow hedge asset at fair value 0 3
Interest rate floors [Member] | Designated as Hedging Instrument [Member] | Other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Interest rate cash flow hedge liability at fair value 0 0
Interest rate swaps with customers [Member] | Not Designated as Hedging Instrument [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative asset not designated as hedging instruments 75,804 27,736
Interest rate swaps with customers [Member] | Not Designated as Hedging Instrument [Member] | Other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liability not designated as hedging instruments 68 358
Mirror swaps with counterparties [Member] | Not Designated as Hedging Instrument [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative asset not designated as hedging instruments 67 351
Mirror swaps with counterparties [Member] | Not Designated as Hedging Instrument [Member] | Other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liability not designated as hedging instruments 76,248 27,819
Risk participation agreements [Member] | Not Designated as Hedging Instrument [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative asset not designated as hedging instruments 22 1
Risk participation agreements [Member] | Not Designated as Hedging Instrument [Member] | Other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liability not designated as hedging instruments 2 1
Interest rate lock commitments [Member] | Not Designated as Hedging Instrument [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative asset not designated as hedging instruments 7,202 1,097
Interest rate lock commitments [Member] | Not Designated as Hedging Instrument [Member] | Other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liability not designated as hedging instruments 0 0
Forward sale commitments [Member] | Not Designated as Hedging Instrument [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative asset not designated as hedging instruments 0 30
Forward sale commitments [Member] | Not Designated as Hedging Instrument [Member] | Other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liability not designated as hedging instruments 2,914 827
Derivative assets [Member]    
Derivatives, Fair Value [Line Items]    
Gross derivative assets 83,095 29,218
Less amounts offset in Consolidated Balance Sheets, derivative liabilities [1] 67 354
Net amounts presented in Consolidated Balance Sheets, derivative assets 83,028 28,864
Less collateral pledged, derivatives assets [2] 0 0
Net amounts 83,028 28,864
Derivative liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Gross derivative liabilities 81,190 29,735
Less amounts offset in Consolidated Balance Sheets, derivative assets [1] 67 354
Net amounts presented in Consolidated Balance Sheets, derivative liabilities 81,123 29,381
Less collateral pledged, derivative liabilities [2] 74,698 27,105
Net amounts $ 6,425 $ 2,276
[1] Interest rate risk management contracts and loan related derivative contracts with counterparties are subject to master netting arrangements.
[2] Collateral 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.