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Derivatives and Balance Sheet Offsetting (Narative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Balance Sheet Offsetting [Line Items]          
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net $ 10,700   $ 10,700    
Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement 26,966   26,966    
Not Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member]          
Balance Sheet Offsetting [Line Items]          
Derivative, Notional Amount 575,400   575,400   $ 428,600
Gain (Loss) on Derivative Instruments, Net, Pretax (2) $ 0 (475) $ (2)  
Designated as Hedging Instrument [Member] | Interest rate collar [Domain]          
Balance Sheet Offsetting [Line Items]          
Derivative, Notional Amount 500,000   500,000    
U.S. Government Agency and Government-Sponsored Enterprise Mortgage-Backed Securities and Collateralized Mortgage Obligations [Member]          
Balance Sheet Offsetting [Line Items]          
Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement $ 26,966   $ 26,966