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Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Jan. 01, 2019
Cash Transactions:            
Interest paid     $ 216,261 $ 136,154    
Income taxes paid, net     61,238 55,525    
Noncash Transactions:            
Loans charged-off to the allowance for loan losses $ 6,780 $ 6,949 21,328 22,316    
Loans foreclosed upon and transferred to other real estate owned     16,870 2,066    
Loans foreclosed upon and transferred to other assets     93 1,580    
Other Real Estate Sales Financed     0 276    
Fixed assets transferred to other real estate owned     5,126 0    
Available-for-sale securities transferred to Held-to-Maturity     0 179,763 $ 179,800  
Transfer of Loans Held-for-sale to Portfolio Loans     0 44,980    
Right of use assets recognized during the period     $ 82,856 $ 0    
Accounting Standards Update 2016-02            
Noncash Transactions:            
Recognized upon initial adoption of ASU           $ 79,900