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Short-Term Borrowings and Long-Term Debt Long Term (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Federal Home Loan Bank advances and long-term debt $ (992,279) $ (1,038,346)
Short-term FHLB advances    
Debt Instrument [Line Items]    
Federal Home Loan Bank advances and long-term debt $ (601,978) (652,113)
Weighted average interest rate 2.40%  
Unused borrowing capacity $ 2,400,000  
Subordinated debt    
Debt Instrument [Line Items]    
Federal Home Loan Bank advances and long-term debt (250,000) (250,000)
Intercompany revolving line of credit 75,000  
Senior Subordinated Notes [Member]    
Debt Instrument [Line Items]    
Federal Home Loan Bank advances and long-term debt (125,000) (125,000)
Junior subordinated deferrable interest debentures    
Debt Instrument [Line Items]    
Federal Home Loan Bank advances and long-term debt (16,496) (16,496)
Unamortized discounts and issuance costs    
Debt Instrument [Line Items]    
Federal Home Loan Bank advances and long-term debt $ (1,195) $ (5,263)
Line of Credit    
Debt Instrument [Line Items]    
Basis spread on variable rate 2.00%