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Loans and Allowance for Credit Losses - Additional Information (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
contract
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Accounts Notes And Loans Receivable [Line Items]        
Percentage of Loans Related to Single Industry on Loans 10.00%   10.00%  
Percentage of real estate loans aggregating to company loan portfolio 75.70%      
Loans and Leases Receivable, Related Parties $ 1,807   $ 1,923 $ 2,694
Loans held for investment $ 10,389,624 $ 9,976,865 $ 10,340,946  
Financing Receivable Ratio of Nonperforming Loans to All Loans and Other Real Estate 0.39%   0.18%  
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans $ 602 526    
Loans and leases receivable, nonaccrual loans 37,500 22,600    
Financing Receivable, Allowance for Credit Losses $ 86,100   $ 86,400  
Allowance for Credit Losses as Percentage of Loans 0.83%   0.83%  
Loans held for sale $ 24,400 34,600 $ 29,400  
Nonaccrual loans $ 37,491   13,147  
Troubled debt restructurings, number of loans | contract 1      
Financing receivable, number of loans with default | contract 0      
Financing receivable, modifications, recorded investment $ 14,800      
Troubled debt restructurings, recorded investment at date of restructure $ 14,783      
Loan to be Considered as Payment Default in Period 90 days      
Troubled Debt Restructuring [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Nonaccrual loans $ 14,800 $ 50    
Nonperforming Financial Instruments [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Loans held for investment $ 40,900   $ 19,000