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Short-Term Borrowings and Long-Term Debt Long Term (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Federal Home Loan Bank advances and long-term debt $ 881,769 $ 992,279
Short-term FHLB advances    
Debt Instrument [Line Items]    
Federal Home Loan Bank advances and long-term debt $ 491,024 601,978
Weighted average interest rate 1.94%  
Unused borrowing capacity $ 3,700,000  
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    
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 $ 751 $ 1,195
Line of Credit    
Debt Instrument [Line Items]    
Basis spread on variable rate 2.00%