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Long- Term Debt to Affiliated Trust Long-Term Debt to Affiliated Trust (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2000
Dec. 31, 1997
Debt Instrument [Line Items]      
Proceeds From The Issuance of Common Trust Securities     $ 1.5
Payments for Repurchase of Trust Preferred Securities   $ 10.0  
Equity Method Investment, Ownership Percentage 100.00%    
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust $ 51.5   51.5
Trust Preferred Securities Subject to Mandatory Redemption [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Description of Variable Rate Basis LIBOR    
Debt Instrument, Basis Spread on Variable Rate 0.875%    
Proceeds from (Repurchase of) Trust Preferred Securities     $ 50.0