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Derivatives and Hedging Activities (Narrative) (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2020
USD ($)
counterparty
instrument
Dec. 31, 2019
USD ($)
instrument
Derivative [Line Items]    
Derivative instruments in accumulated other comprehensive income reclassified to interest expense $ 3,500  
Derivative liability, notional amount $ 640,000  
Number of counterparties | counterparty 4  
Counterparty in liability position | counterparty 4  
Derivative liabilities $ 135,500  
Collateral against obligations 136,100  
Derivatives Not Designated as a Hedging Instruments    
Derivative [Line Items]    
Credit derivatives, fair value $ 540 $ 47
Derivatives Not Designated as a Hedging Instruments | Interest rate products    
Derivative [Line Items]    
Number of derivative instruments held (in instrument) | instrument 158 92
Derivative notional amount $ 2,440,000 $ 1,610,000
Derivatives Not Designated as a Hedging Instruments | Credit contracts    
Derivative [Line Items]    
Number of derivative instruments held (in instrument) | instrument 13  
Derivative notional amount $ 111,800 $ 106,000
Amount of collateral $ 650  
Designated as Hedging Instrument    
Derivative [Line Items]    
Number of outstanding derivatives | instrument 15