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Derivative Instruments (Narrative) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Derivative [Line Items]        
Net unrealized gains (losses) arising during the period   $ 99,193,000 $ (8,570,000) $ 0
Unrealized gain, after tax   73,502,000 (6,350,000) $ 0
Pre-tax income   2,800,000    
Unamortized deferred net loss balance from previously terminated cash flow hedges   40,000,000    
Pre-tax gains included in interest income on cash flow hedges   5,000,000    
Collateral   155,400,000 84,600,000  
Variation margin, amount reducing derivative liability   162,700,000 113,700,000  
Foreign Exchange Forward        
Derivative [Line Items]        
Notional amount   $ 24,100,000 $ 32,900,000  
Cash Flow Hedging        
Derivative [Line Items]        
Net unrealized gains (losses) arising during the period $ 9,800,000      
Unrealized gain, after tax $ 7,300,000