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Derivative Financial Instruments (Fair Value of Derivatives by Balance Sheet Location) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
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 $ 20
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 0 903
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 730 0
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 3 37
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 27,736 5,340
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 358 7,719
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 351 7,592
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 27,819 5,392
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 1 0
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 1 0
Foreign exchange contracts [Member] | Not Designated as Hedging Instrument [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative asset not designated as hedging instruments 0 0
Foreign exchange contracts [Member] | Not Designated as Hedging Instrument [Member] | Other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liability not designated as hedging instruments 0 7
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 1,097 806
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 30 0
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 827 816
Derivative assets [Member]    
Derivatives, Fair Value [Line Items]    
Gross derivative assets 29,218 14,698
Less amounts offset in Consolidated Balance Sheets, derivative liabilities [1] 354 10,732
Net amounts presented in Consolidated Balance Sheets, derivative assets 28,864 3,966
Less collateral pledged, derivatives assets [2] 0 0
Net amounts 28,864 3,966
Derivative liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Gross derivative liabilities 29,735 13,934
Less amounts offset in Consolidated Balance Sheets, derivative assets [1] 354 10,732
Net amounts presented in Consolidated Balance Sheets, derivative liabilities 29,381 3,202
Less collateral pledged, derivative liabilities [2] 27,105 1,460
Net amounts $ 2,276 $ 1,742
[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.