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Short-Term Borrowings and Long-Term Debt Long Term (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Long-term borrowings $ 1,296,263 $ 881,769
Short-term FHLB advances    
Debt Instrument [Line Items]    
Long-term borrowings $ 535,973 491,024
Weighted average interest rate 1.78%  
Unused borrowing capacity $ 3,900,000  
Subordinated debt    
Debt Instrument [Line Items]    
Long-term borrowings 625,000 250,000
Intercompany revolving line of credit 75,000  
Senior Subordinated Notes    
Debt Instrument [Line Items]    
Long-term borrowings 125,000 125,000
Junior subordinated deferrable interest debentures    
Debt Instrument [Line Items]    
Long-term borrowings 16,496 16,496
Unamortized discounts and issuance costs    
Debt Instrument [Line Items]    
Long-term borrowings $ 6,206 $ 751
Line of Credit    
Debt Instrument [Line Items]    
Basis spread on variable rate 2.00%