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Other Borrowings - Short-Term Borrowings (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
FHLB Advances      
Outstanding advances $ 0 $ 0 $ 700,000
Shot-term borrowings 0 $ 0 $ 700,000
Short term borrowings      
FHLB Advances      
Long-term Debt, Weighted Average Interest Rate, over Time   0.63%  
FHLB Advances      
FHLB Advances      
Loans pledged via a blanket lien to the FHLB for advances and letters of credit 3,600,000 $ 3,600,000  
Investment securities pledged 346,600 346,600  
Total borrowing capacity at FHLB 2,800,000 2,800,000  
Letter of credit borrowed 12,200 12,200  
Unused net credit available with the FHLB 2,800,000 2,800,000  
Long-term Debt, Weighted Average Interest Rate, at Point in Time     1.73%
Long-term Debt, Weighted Average Interest Rate, over Time     2.35%
Average amount of FHLB advances outstanding   745,900 $ 538,600
Payments of FHLB advances 700,000    
FHLB Advances | Interest rate swap      
FHLB Advances      
Non- interest expense 38,800    
FRB Borrowings      
FHLB Advances      
Letter of credit borrowed 0 0  
Maximum borrowing capacity 1,200,000 1,200,000  
Loans secured by blanket lien $ 2,000,000 $ 2,000,000