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Basis of Accounting and Consolidation - Additional Information (Details) - USD ($)
 12 Months Ended
Feb. 14, 2022
Feb. 22, 2021
Jan. 02, 2020
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Jul. 28, 2021
Jan. 01, 2020
Dec. 31, 2019
Jan. 01, 2019
Summary Of Significant Accounting Policies [Line Items]                    
Common stock, par value (in dollars per share)       $ 4 $ 4          
Assets       $ 6,744,215,000 $ 5,986,582,000          
Loans       4,766,781,000 3,938,120,000          
Deposits       $ 5,257,001,000 $ 4,956,486,000          
Amortization period         10 years          
Loans acquired         $ 208,000,000          
Customer deposits assumed         219,000,000          
Core deposit intangible asset         4,900,000          
Federal funds selling period       1 day            
Intangible assets amortization period       15 years            
Captive maximum gross premiums       $ 2,450,000            
Value of trust accounts       $ 5,300,000,000 $ 5,100,000,000          
Stock plans, term       10 years            
Maximum number of shares to be issued in stock incentive plan (in shares)       149,983            
RSA/RSU, grants in period, gross       63,150 48,575 25,950        
Employee discount for employee stock purchase plan       15.00%            
Employee stock purchase plan, number of shares authorized       600,000            
Stock issued during period, shares, employee stock purchase plans       23,055 11,748 11,037        
Right of use lease assets       $ 15,774,000 $ 15,116,000          
Lease liability       16,035,000 15,322,000          
Cumulative change in accounting principal       633,155,000 633,894,000 $ 568,228,000     $ 526,609,000  
Allowance for credit losses on loans       $ 59,093,000 $ 54,655,000 $ 41,910,000     26,911,000  
Cumulative Effect, Period of Adoption, Adjustment                    
Summary Of Significant Accounting Policies [Line Items]                    
Cumulative change in accounting principal                 (717,000)  
Accounting Standards Update 2016-02                    
Summary Of Significant Accounting Policies [Line Items]                    
Change in accounting principle, accounting standards update, adopted [true false]       true            
Change in accounting principle, accounting standards update, adoption date       Jan. 01, 2019            
Right of use lease assets                   $ 14,100,000
Lease liability                   $ 14,100,000
ASU 2016-13                    
Summary Of Significant Accounting Policies [Line Items]                    
Allowance for credit losses on loans               $ 28,583,000    
Off-balance sheet, credit loss, liability               69,000    
Allowance for credit losses, held-to-maturity debt securities               0    
Amortized cost of PCD assets reflected the addition to allowance for credit losses     $ 833,000,000              
ASU 2016-13 | Revision of Prior Period, Adjustment                    
Summary Of Significant Accounting Policies [Line Items]                    
Allowance for credit losses on loans               1,672,000    
Off-balance sheet, credit loss, liability               69,000    
ASU 2016-13 | Cumulative Effect, Period of Adoption, Adjustment                    
Summary Of Significant Accounting Policies [Line Items]                    
Cumulative change in accounting principal               $ (717,000)    
Allowance for credit losses on loans                 $ 1,672,000  
Minimum                    
Summary Of Significant Accounting Policies [Line Items]                    
Certificates of deposit investments original maturities period       3 years            
Maximum                    
Summary Of Significant Accounting Policies [Line Items]                    
Certificates of deposit investments original maturities period       5 years            
Delta Bancshare Company                    
Summary Of Significant Accounting Policies [Line Items]                    
Percentage of issued and outstanding shares acquired 100.00%                  
Common stock, par value (in dollars per share) $ 10.00           $ 10.00      
Share Price $ 4.00                  
Consideration payable in cash $ 15,150,000                  
Consideration payable in shares 2,292,270                  
LINCO Bancshares, Inc.                    
Summary Of Significant Accounting Policies [Line Items]                    
Percentage of issued and outstanding shares acquired   100.00%                
Common stock, par value (in dollars per share)   $ 1.00                
Share Price   $ 4.00                
Consideration payable in cash   $ 103,500,000                
Consideration payable in shares   1,262,246                
Consideration payable in shares   1,262,246                
Dividends   $ 13,000,000