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Derivative Financial Instruments (Fair Value of Derivatives by Balance Sheet Location) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Derivative Financial Instruments, Assets [Member]    
Derivatives, Fair Value [Line Items]    
Gross derivative positions $ 40,078 $ 14,698
Amounts offset in balance sheet [1] 157 10,732
Net amounts presented in balance sheet 39,921 3,966
Collateral pledged [2] 0 0
Net amounts 39,921 3,966
Derivative Financial Instruments, Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Gross derivative positions 39,974 13,934
Amounts offset in balance sheet [1] 157 10,732
Net amounts presented in balance sheet 39,817 3,202
Collateral pledged [2] 37,695 1,460
Net amounts 2,122 1,742
Derivatives Designated as Cash Flow Hedging Instruments [Member] | Interest rate caps [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets designated as a cash flow hedge 0 20
Derivatives Designated as Cash Flow Hedging Instruments [Member] | Interest rate caps [Member] | Other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities designated as a cash flow hedge 0 0
Derivatives Designated as Cash Flow Hedging Instruments [Member] | Interest rate swaps [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets designated as a cash flow hedge 2 903
Derivatives Designated as Cash Flow Hedging Instruments [Member] | Interest rate swaps [Member] | Other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities designated as a cash flow hedge 1,000 0
Derivatives Designated as Cash Flow Hedging Instruments [Member] | Interest rate floors [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets designated as a cash flow hedge 69 37
Derivatives Designated as Cash Flow Hedging Instruments [Member] | Interest rate floors [Member] | Other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities designated as a cash flow hedge 0 0
Not Designated as Hedging Instrument [Member] | Interest rate swaps with customers [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets not designated 37,765 5,340
Not Designated as Hedging Instrument [Member] | Interest rate swaps with customers [Member] | Other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities not designated 80 7,719
Not Designated as Hedging Instrument [Member] | Mirror swaps with counterparties [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets not designated 80 7,592
Not Designated as Hedging Instrument [Member] | Mirror swaps with counterparties [Member] | Other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities not designated 37,913 5,392
Not Designated as Hedging Instrument [Member] | Risk participation agreements [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets not designated 1 0
Not Designated as Hedging Instrument [Member] | Risk participation agreements [Member] | Other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities not designated 3 0
Not Designated as Hedging Instrument [Member] | Foreign exchange contracts [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets not designated 6 0
Not Designated as Hedging Instrument [Member] | Foreign exchange contracts [Member] | Other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities not designated 0 7
Not Designated as Hedging Instrument [Member] | Interest rate lock commitments [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets not designated 1,762 806
Not Designated as Hedging Instrument [Member] | Interest rate lock commitments [Member] | Other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities not designated 1 0
Not Designated as Hedging Instrument [Member] | Forward sale commitments [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets not designated 393 0
Not Designated as Hedging Instrument [Member] | Forward sale commitments [Member] | Other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities not designated $ 977 $ 816
[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.