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Other Borrowings - Short-term FHLB Advances (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2019
FHLB Advances          
Outstanding advances   $ 700,000 $ 150,000    
Notional Amount   2,051,663 $ 889,162    
Interest rate swap agreement one          
FHLB Advances          
Notional Amount $ 350,000        
Term of agreement 4 years        
Interest rate swap agreement two          
FHLB Advances          
Notional Amount $ 350,000        
Term of agreement 5 years        
FHLB Advances          
FHLB Advances          
Loans pledged via a blanket lien to the FHLB for advances and letters of credit   3,300,000      
Total borrowing capacity at FHLB   2,500,000      
Letter of credit borrowed   231,100      
Unused net credit available with the FHLB   $ 1,600,000      
Long-term Debt, Weighted Average Interest Rate, at Point in Time   1.73% 2.64% 1.48%  
Long-term Debt, Weighted Average Interest Rate, over Time   2.35% 1.57% 0.97%  
Average amount of FHLB advances outstanding   $ 538,600 $ 42,300    
Payments of FHLB advances $ 150,000        
FHLB advances borrowed $ 500,000       $ 200,000
Period of fixed rate FHLB advances 90 days