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Loans, Allowance for Credit Losses, and Asset Quality Information - Narrative (Details)
 9 Months Ended
Sep. 30, 2024
USD ($)
loan
Sep. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
loan
Jun. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Loans and Leases Receivable Disclosure [Line Items]            
Unamortized premium (discount) on acquired loans $ (17,300,000)     $ (24,000,000.0)    
Total loans, net of deferred loan costs/(fees) $ 8,013,538,000     $ 8,150,102,000    
Number of loans to debtors with nonperforming loans | loan 2     1    
Nonperforming loans, commitment to lend $ 0     $ 0    
Interest income on nonaccrual loans 0 $ 0        
Non accrual individually evaluated loan threshold 500,000          
Collateral dependent individually evaluated loan threshold 500,000          
Allowance for credit losses on loans 122,718,000 108,198,000 $ 110,058,000 109,853,000 $ 109,230,000 $ 90,967,000
Hurricane            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans 755,394,000          
Allowance for Loan and Lease Losses, Period Increase (Decrease) $ 13,000,000.0          
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent 1.53%          
Portions Of Western North And South Carolina | Hurricane            
Loans and Leases Receivable Disclosure [Line Items]            
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent 3.01%   1.29%      
Allowance for Loan and Lease Losses, Period Increase (Decrease), Percent 0.0016          
Asset Pledged as Collateral            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of deferred loan costs/(fees) $ 6,600,000,000     6,500,000,000    
Consumer loans            
Loans and Leases Receivable Disclosure [Line Items]            
Allowance for credit losses on loans 3,088,000 3,010,000 $ 3,329,000 2,992,000 2,688,000 2,900,000
Consumer loans | Hurricane            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans 0          
Commercial and industrial            
Loans and Leases Receivable Disclosure [Line Items]            
Allowance for credit losses on loans 18,143,000 22,444,000 19,837,000 21,227,000 23,442,000 17,718,000
Commercial and industrial | Hurricane            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans $ 10,481,000          
Real Estate | Receivable Benchmark | Collateral Type Concentration Risk            
Loans and Leases Receivable Disclosure [Line Items]            
Concentration risk percentage 88.00%          
Officers and Directors            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of deferred loan costs/(fees) $ 63,300,000     63,700,000    
Number of new loans | loan 1          
Financing receivable, excluding accrued interest, advances $ 1,300,000          
Repayments received from related parties 1,600,000          
Officers and Directors | Unused lines of Credit            
Loans and Leases Receivable Disclosure [Line Items]            
Financing receivable, excluding accrued interest, available credit 1,000,000.0     2,700,000    
Residential Mortgage Loans            
Loans and Leases Receivable Disclosure [Line Items]            
Presold mortgages in process of settlement 800,000     1,000,000    
Unfunded Loan Commitment            
Loans and Leases Receivable Disclosure [Line Items]            
Allowance for credit losses on loans 9,277,000 $ 11,819,000 $ 9,860,000 11,369,000 $ 13,019,000 $ 13,306,000
SBA Loans            
Loans and Leases Receivable Disclosure [Line Items]            
Unamortized premium (discount) on acquired loans $ (3,300,000)     $ (3,500,000)