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Derivative Financial Instruments (Fair Value of Derivatives by Balance Sheet Location) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Derivative Financial Instruments, Assets [Member]    
Derivatives, Fair Value [Line Items]    
Gross derivative positions $ 90,153 $ 29,218
Amounts offset in balance sheet [1] 244 354
Net amounts presented in balance sheet 89,909 28,864
Collateral pledged [2] 0 0
Net amounts 89,909 28,864
Derivative Financial Instruments, Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Gross derivative positions 91,390 29,735
Amounts offset in balance sheet [1] 244 354
Net amounts presented in balance sheet 91,146 29,381
Collateral pledged [2] 30,051 27,105
Net amounts 61,095 2,276
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 0
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 0 0
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 2,489 730
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 236 3
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 84,833 27,736
Not Designated as Hedging Instrument [Member] | Interest rate swaps with customers [Member] | Other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities not designated 9 358
Not Designated as Hedging Instrument [Member] | Mirror swaps with counterparties [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets not designated 8 351
Not Designated as Hedging Instrument [Member] | Mirror swaps with counterparties [Member] | Other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities not designated 85,108 27,819
Not Designated as Hedging Instrument [Member] | Risk participation agreements [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets not designated 11 1
Not Designated as Hedging Instrument [Member] | Risk participation agreements [Member] | Other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities not designated 3 1
Not Designated as Hedging Instrument [Member] | Interest rate lock commitments [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets not designated 4,937 1,097
Not Designated as Hedging Instrument [Member] | Interest rate lock commitments [Member] | Other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities not designated 105 0
Not Designated as Hedging Instrument [Member] | Forward sale commitments [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets not designated 128 30
Not Designated as Hedging Instrument [Member] | Forward sale commitments [Member] | Other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities not designated $ 3,676 $ 827
[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.