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Loans and Allowance for Credit Losses - Additional Information (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
Asset
contract
Dec. 31, 2018
USD ($)
Asset
contract
Dec. 31, 2017
USD ($)
Asset
Accounts Notes And Loans Receivable [Line Items]      
Loan purchase discounts $ 277,500,000    
Loans held for sale 81,000,000.0    
Loans $ 18,757,877,000 $ 10,283,873,000  
Percentage of Loans Related to Single Industry on Loans 10.00% 10.00%  
Percentage of real estate loans aggregating to company loan portfolio 68.60%    
Loans and Leases Receivable, Related Parties $ 4,152,000 $ 1,923,000 $ 2,694,000
Loans held for investment $ 17,211,625,000 $ 10,340,946,000 $ 9,989,384,000
Financing Receivable Ratio of Nonperforming Loans to All Loans and Other Real Estate 0.33% 0.18% 0.37%
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans $ 2,900,000 $ 1,700,000 $ 2,700,000
Loans and leases receivable, nonaccrual loans $ 55,200,000 13,100,000 25,300,000
Change in discounted cash-flow 10.00%    
Financing Receivable, Allowance for Credit Losses $ 87,500,000 $ 86,400,000 $ 84,000,000.0
Allowance for Credit Losses as Percentage of Loans 0.46% 0.83% 0.84%
Allowance for credit losses, Period decrease   $ 1,100,000  
Allowance for credit losses, Period decrease percent   1.20%  
Nonaccrual loans $ 55,243,000 $ 13,147,000  
Troubled debt restructurings, number of loans | contract 3 2  
Troubled debt restructurings, recorded investment at date of restructure $ 15,252,000 $ 198,000  
Financing receivable, modifications, recorded investment $ 13,600,000 $ 12,000  
Financing receivable, number of loans with default | contract 0 0  
Loan to be Considered as Payment Default in Period 90 days    
Restructured loans charge-off $ 0 $ 0  
Troubled Debt Restructuring [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Nonaccrual loans 13,600 51,000  
Nonperforming Financial Instruments [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Loans held for investment $ 62,900,000 $ 19,000,000.0 $ 37,500,000
Nonperforming assets, number of credits or other real estate properties | Asset 232 83 99
Warehouse Purchase Program [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Participation interest in mortgage loans acquired percentage 100.00%    
Loans held for investment $ 1,550,000,000    
Residential Mortgage Loans [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Loans held for sale 81,000,000.0 $ 29,400,000 $ 31,400,000
Warehouse Purchase Program [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Loans 1,550,000,000    
Loans held for investment $ 1,552,762,000    
Real Estate [Member] | 1-4 Family Residential (Includes Home Equity) [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Loan collateralized 89.00%    
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Loans held for investment $ 6,556,285,000 3,538,557,000 $ 3,315,627,000
Nonaccrual loans $ 12,714,000 $ 2,727,000  
Real Estate [Member] | FHA and VA Loans [Member] | 1-4 Family Residential (Includes Home Equity) [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Debt instrument, term 30 years    
Minimum [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Loan evaluation by loan concurrence officers $ 1,000,000.0    
Minimum [Member] | Consumer Portfolio Segment [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Debt instrument, term 12 months    
Minimum [Member] | Real Estate [Member] | 1-4 Family Residential (Includes Home Equity) [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Debt instrument, term 5 years    
Minimum [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Debt instrument, term 15 years    
Maximum [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Loan evaluation by loan concurrence officers $ 5,000,000.0    
Maximum [Member] | Consumer Portfolio Segment [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Debt instrument, term 180 months    
Maximum [Member] | Real Estate [Member] | 1-4 Family Residential (Includes Home Equity) [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Debt instrument, term 30 years    
Maximum [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Period of fixed interest 5 years    
Debt instrument, term 25 years