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Business Combinations - Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 01, 2022
Dec. 31, 2023
Dec. 31, 2022
Jun. 30, 2022
Dec. 31, 2021
Business Acquisition [Line Items]          
Carrying amount of Company's goodwill   $ 1,398,253 $ 1,398,253   $ 973,025
Goodwill   $ 0 425,228    
Happy Bancshares, Inc.          
Business Acquisition [Line Items]          
Cash and due from banks $ 112,999     $ 112,553  
Measurement Period Adjustments, Cash and due from banks (446)        
Interest-bearing deposits with other banks 746,031     746,031  
Measurement Period Adjustments, Interest-bearing deposits with other banks 0        
Cash and cash equivalents 859,030     858,584  
Measurement Period Adjustments, Cash and cash equivalents (446)        
Investment securities - available-for-sale, net of allowance for credit losses 1,773,540     1,782,025  
Measurement Period Adjustments, Investment securities - available-for-sale, net of allowance for credit losses 8,485        
Total investment securities 1,773,540     1,782,025  
Measurement Period Adjustments, Total investment securities 8,485        
Loans receivable 3,657,009     3,652,620  
Measurement Period Adjustments, Loans receivable (4,389)        
Allowance for credit losses (42,224)   $ (16,800) (16,816)  
Measurement Period Adjustments, Allowance for credit losses 25,408        
Loans receivable, net 3,614,785     3,635,804  
Measurement Period Adjustments, Loans receivable, net 21,019        
Bank premises and equipment, net 153,642     141,372  
Measurement Period Adjustments, Bank premises and equipment, net 12,270        
Foreclosed assets held for sale 193     116  
Measurement Period Adjustments, Foreclosed assets held for sale (77)        
Cash value of life insurance 105,049     105,052  
Measurement Period Adjustments, Cash value of life insurance 3        
Accrued interest receivable 31,575     31,575  
Measurement Period Adjustments, Accrued interest receivable 0        
Deferred tax asset, net 32,908     31,816  
Measurement Period Adjustments, Deferred tax asset, net (1,092)        
Carrying amount of Company's goodwill 130,428     0  
Measurement Period Adjustments, Goodwill (130,428)        
Core deposit and other intangibles 10,672     42,263  
Measurement Period Adjustments, Core deposit and other intangibles 31,591        
Other assets 43,330     58,897  
Measurement Period Adjustments, Other assets 15,567        
Total assets acquired 6,755,152     6,687,504  
Measurement Period Adjustments, Total assets acquired (67,648)        
Demand and non-interest-bearing 1,932,756     1,932,823  
Measurement Period Adjustments, Demand and non-interest-bearing 67        
Savings and interest-bearing transaction accounts 3,519,652     3,519,652  
Measurement Period Adjustments, Savings and interest-bearing transaction accounts 0        
Time deposits 401,899     402,802  
Adjustment to market value - time deposits 903        
Total deposits 5,854,307     5,855,277  
Measurement Period Adjustments, Total deposits 970        
FHLB and other borrowed funds 74,212     78,330  
Measurement Period Adjustments, FHLB and other borrowed funds 4,118        
Accrued interest payable and other liabilities 50,889     48,997  
Measurement Period Adjustments, Accrued interest payable and other liabilities (1,892)        
Subordinated debentures 159,965     167,590  
Measurement Period Adjustments, Subordinated Debt 7,625        
Total liabilities assumed 6,139,373     6,150,194  
Measurement Period Adjustments, Total liabilities assumed 10,821        
Total equity assumed 615,779     0  
Measurement Period Adjustments, Total equity assumed (615,779)        
Total liabilities and equity assumed 6,755,152     6,150,194  
Measurement Period Adjustments, Total liabilities and equity assumed (604,958)        
Net assets acquired       $ 537,310  
Purchase price 962,538        
Goodwill $ 425,228