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Short-Term Borrowings and Long-Term Debt Long Term (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Federal Home Loan Bank advances and long-term debt $ (1,038,346) $ (929,403)
Short-term FHLB advances    
Debt Instrument [Line Items]    
Federal Home Loan Bank advances and long-term debt $ (652,113) (567,240)
Weighted average interest rate 2.30%  
Unused borrowing capacity $ 3,600,000  
Subordinated debt    
Debt Instrument [Line Items]    
Federal Home Loan Bank advances and long-term debt (250,000) (350,000)
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) 0
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 $ (5,263) $ (4,333)
Line of Credit    
Debt Instrument [Line Items]    
Basis spread on variable rate 2.00%