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Mergers and Acquisitions - Additional Information (Detail)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Jan. 10, 2025
USD ($)
shares
Sep. 05, 2024
Offices
May 09, 2024
$ / shares
Dec. 31, 2025
USD ($)
$ / shares
Sep. 30, 2025
USD ($)
 [1]
Jun. 30, 2025
USD ($)
 [1]
Mar. 31, 2025
USD ($)
 [1]
Dec. 31, 2024
USD ($)
$ / shares
Sep. 30, 2024
USD ($)
 [1]
Jun. 30, 2024
USD ($)
 [1]
Mar. 31, 2024
USD ($)
 [1]
Dec. 31, 2025
USD ($)
$ / shares
Dec. 31, 2024
USD ($)
$ / shares
Dec. 31, 2023
USD ($)
Business Acquisition [Line Items]                            
Par value of Share | $ / shares       $ 2.5       $ 2.5       $ 2.5 $ 2.5  
Assets       $ 33,660,281       $ 30,023,545       $ 33,660,281 $ 30,023,545  
Business combination intangible assets acquired goodwill                       129,959 0 $ 0
Financing receivable, purchased with credit deterioration, discount (premium)                       20,906    
Business acquisition allowances for loans and lease losses including reserve for unfunded commitments for assets with credit deterioration                       17,518 0 0
Net income (loss)       128,828 [1] $ 130,748 $ 120,721 $ 84,306 94,408 [1] $ 95,267 $ 96,507 $ 86,814 464,603 372,996 366,313
Contract with Customer, Asset, Allowance for Credit Loss       297,518       271,844       $ 297,518 271,844 $ 259,237
Business combination separately recognized transaction acquisition related cost expensed statement of income or comprehensive income extensible enumeration not disclosed flag                       true    
Loans at consummation       24,720,620       $ 21,680,498       $ 24,720,620 $ 21,680,498  
Piedmont Bancorp [Member] | Merger Agreement [Member]                            
Business Acquisition [Line Items]                            
Par value of Share | $ / shares     $ 0.025                      
Business combination aggregate purchase consideration                       280,967    
Business combination purchase consideration equity shares issued or issuable value                       280,946    
Business combination intangible assets acquired goodwill                       129,959    
Net income (loss) $ 102,675                          
Revenues 151,925                          
Business combination, recognized identifiable assets acquired and liabilities assumed, noncurrent liabilities, other       1,024               1,024    
Business combination, recognized identifiable assets acquired and liabilities assumed, deferred tax liabilities       5,910               5,910    
Business combination, recognized identifiable assets acquired and liabilities assumed, net       4,756               4,756    
Accounts and Financing Receivable, Allowance for Credit Loss $ 18,726                          
Acquired Loan Commitments Reserve                       4,058    
Contract with Customer, Asset, Allowance for Credit Loss       $ 36,244               36,244    
Fair value premiums of interest bearing time deposit                       408    
Fair value premiums of building acquired                       1,469    
Fair value discounts of land acquired                       3,492    
Fair Value Discounts Of Available For Sale Of Securities                       24,977    
Fair value discounts of loans and leases acquired                       64,065    
Business combination consideration transferred for fractional shares                       21    
Stock issued during period, shares, acquisitions | shares 7,860,831                          
Core deposit intangible acquired                       32,764    
Deposit Assets $ 2,105,402                          
Loans at consummation 2,079,933                          
Number of trading days for determining the consideration for options and warrants   10 days                        
Stockholders equity stock split conversion ratio     0.003                      
Number of Businesses Acquired | Offices   16                        
PCD Loan [Member] | Piedmont Bancorp [Member] | Merger Agreement [Member]                            
Business Acquisition [Line Items]                            
Financing receivable, purchased with credit deterioration, discount (premium)                       20,906    
Business acquisition allowances for loans and lease losses including reserve for unfunded commitments for assets with credit deterioration                       17,518    
Non PDC Loans [Member] | Piedmont Bancorp [Member] | Merger Agreement [Member]                            
Business Acquisition [Line Items]                            
Business acquisition allowances for loans and lease losses including reserve for unfunded commitments for assets with credit deterioration                       $ 18,726    
Fair value financing receivable purchased with credit deterioration at acquisition date 43,159                          
Business combination unamortized discount on debt useful life                       4 years 9 months 18 days    
Provision for other credit losses                       $ 18,726    
Business combination, separately recognized transactions, additional disclosures, acquisition cost expensed 31,407                          
Piedmont Bank [Member] | Merger Agreement [Member]                            
Business Acquisition [Line Items]                            
Assets $ 2,356,883                          
Piedmont Bank [Member] | Piedmont Bancorp [Member] | Merger Agreement [Member]                            
Business Acquisition [Line Items]                            
Business Acquisition, Share Price | $ / shares       $ 35.74               $ 35.74    
Piedmont Bank [Member] | PCD Loan [Member] | Merger Agreement [Member]                            
Business Acquisition [Line Items]                            
Business combination unamortized discount on debt useful life                       5 years 6 months    
Piedmont Bank [Member] | Trust Preferred Securities Subject to Mandatory Redemption [Member]                            
Business Acquisition [Line Items]                            
Business combination unamortized discount on debt useful life                       30 years 6 months    
[1] For further information, see the related discussion “Quarterly Results” included in Management’s Discussion and Analysis.