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Loans, Allowance for Credit Losses, and Asset Quality Information - Narrative (Details)
$ in Thousands
12 Months Ended
Jan. 01, 2023
USD ($)
Dec. 31, 2023
USD ($)
loan
Dec. 31, 2022
USD ($)
loan
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Loans and Leases Receivable Disclosure [Line Items]          
Unamortized discount on acquired loans   $ 24,000 $ 11,600    
Loans   8,150,102 $ 6,665,145    
Number of loans to debtors with nonperforming loans | loan     1    
Net book balance of individually evaluated loans on nonaccrual, threshold amount for designation as collateral dependent loans   500      
Revolving, converted to term loan   25,900 $ 7,900    
Allowance for credit loss, fee, and loan in process   8,150,280 6,666,548    
Allowance for credit losses on loans   109,853 90,967 $ 78,789 $ 52,388
Interest income on nonaccrual loans   0 0    
Grand South          
Loans and Leases Receivable Disclosure [Line Items]          
Loans reclassified from fair value mark to ACL resulting from PCD loans $ 5,610        
Allowance for credit loss, increase from acquisition, non-purchase $ 12,200        
SBA Loans          
Loans and Leases Receivable Disclosure [Line Items]          
Unamortized discount on acquired loans   3,500 4,300    
Asset Pledged as Collateral without Right          
Loans and Leases Receivable Disclosure [Line Items]          
Loans   6,500,000 5,300,000    
Commercial and industrial          
Loans and Leases Receivable Disclosure [Line Items]          
Allowance for credit loss, fee, and loan in process   905,862 641,941    
Allowance for credit losses on loans   21,227 17,718 16,249 11,316
Consumer loans          
Loans and Leases Receivable Disclosure [Line Items]          
Allowance for credit loss, fee, and loan in process   68,443 60,659    
Allowance for credit losses on loans   2,992 2,900 2,656 $ 1,478
Special Mention Loans          
Loans and Leases Receivable Disclosure [Line Items]          
Allowance for credit loss, fee, and loan in process   44,100 39,000    
Special Mention Loans | Consumer loans          
Loans and Leases Receivable Disclosure [Line Items]          
Allowance for credit loss, fee, and loan in process   0 0    
Classified          
Loans and Leases Receivable Disclosure [Line Items]          
Allowance for credit loss, fee, and loan in process   54,200 48,500    
Classified | Consumer loans          
Loans and Leases Receivable Disclosure [Line Items]          
Allowance for credit loss, fee, and loan in process   $ 250 435    
Real Estate          
Loans and Leases Receivable Disclosure [Line Items]          
Threshold percentage to write-off nonaccrual loans   90.00%      
Real Estate | Receivable Benchmark | Collateral Type Concentration Risk          
Loans and Leases Receivable Disclosure [Line Items]          
Concentration risk percentage   88.00%      
Hotel | Minimum          
Loans and Leases Receivable Disclosure [Line Items]          
Threshold percentage to write-off nonaccrual loans   10.00%      
Hotel | Maximum          
Loans and Leases Receivable Disclosure [Line Items]          
Threshold percentage to write-off nonaccrual loans   25.00%      
Non Real Estate          
Loans and Leases Receivable Disclosure [Line Items]          
Threshold percentage to write-off nonaccrual loans   75.00%      
Management          
Loans and Leases Receivable Disclosure [Line Items]          
Loans   $ 63,700 6,000    
Number of new loans to related parties | loan   9      
New loans to related parties   $ 58,500      
Repayments received from related parties   800      
Management | Unused lines of Credit          
Loans and Leases Receivable Disclosure [Line Items]          
Financing receivable, excluding accrued interest, available credit   2,700 1,200    
Residential Mortgage Loans          
Loans and Leases Receivable Disclosure [Line Items]          
Presold mortgages in process of settlement   1,000 800    
Unfunded Loan Commitment          
Loans and Leases Receivable Disclosure [Line Items]          
Allowance for credit losses on loans   $ 11,369 $ 13,306 $ 13,506