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Acquisitions - Amounts Recorded on Consolidated Balance Sheet on Acquisition Date (Details) - USD ($)
$ in Thousands
12 Months Ended
Nov. 01, 2019
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2019
Fair value of liabilities assumed:        
Goodwill   $ 3,231,636 $ 3,231,636 $ 3,223,671
Legacy Texas [Member]        
Fair value of consideration paid:        
Common stock issued (26,228,148 shares)   1,810,267    
Payments to acquire businesses in cash $ 318,000 318,018    
Total consideration paid   2,128,285    
Fair value of assets acquired:        
Cash and due from banks   228,649    
Securities held to maturity   472,933    
Loans held for sale   60,818    
Loans held for investment   6,771,080    
Loans held for investment - Warehouse Purchase Program   1,693,049    
Bank premises and equipment   64,110    
Other real estate owned   4,876    
Core deposit intangibles   60,058    
Federal Home Loan Bank stock   117,826    
Bank owned life insurance and other assets   237,823    
Total assets acquired   9,711,222    
Fair value of liabilities assumed:        
Deposits   6,434,732    
Other borrowings   2,078,682    
Securities sold under repurchase agreements   57,670    
Junior subordinated debentures   15,376    
Subordinated notes   125,950    
Other liabilities   201,318    
Total liabilities assumed   8,913,728    
Fair value of net assets acquired   797,494    
Goodwill   1,330,791    
ASC 805 [Member] | Legacy Texas [Member]        
Fair value of consideration paid:        
Common stock issued (26,228,148 shares) 1,810,267      
Payments to acquire businesses in cash 318,018      
Total consideration paid 2,128,285      
Fair value of assets acquired:        
Cash and due from banks 228,649      
Securities held to maturity 472,933      
Loans held for sale 60,818      
Loans held for investment 6,771,080      
Loans held for investment - Warehouse Purchase Program 1,693,049      
Bank premises and equipment 67,347      
Other real estate owned 4,876      
Core deposit intangibles 60,058      
Federal Home Loan Bank stock 117,939      
Bank owned life insurance and other assets 242,592      
Total assets acquired 9,719,341      
Fair value of liabilities assumed:        
Deposits 6,434,732      
Other borrowings 2,078,682      
Securities sold under repurchase agreements 57,670      
Junior subordinated debentures 15,376      
Subordinated notes 125,950      
Other liabilities 201,472      
Total liabilities assumed 8,913,882      
Fair value of net assets acquired 805,459      
Goodwill $ 1,322,826      
Measurement Period Adjustments [Member] | ASC 805 [Member] | Legacy Texas [Member]        
Fair value of assets acquired:        
Bank premises and equipment   (3,237)    
Federal Home Loan Bank stock   (113)    
Bank owned life insurance and other assets   (4,769)    
Total assets acquired   (8,119)    
Fair value of liabilities assumed:        
Other liabilities   (154)    
Total liabilities assumed   (154)    
Fair value of net assets acquired   (7,965)    
Goodwill   $ 7,965