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Allowance for Credit Losses, Credit Quality and Other - Additional Information (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Mar. 31, 2024
USD ($)
Sep. 30, 2025
USD ($)
loan
Sep. 30, 2024
USD ($)
loan
Dec. 31, 2024
USD ($)
loan
Financing Receivable Allowance For Credit Losses [Line Items]            
Provision for credit losses on loans $ 6,700,000 $ 18,200,000   $ 9,700,000 $ 31,700,000  
Recovery of credit losses - unfunded commitments (1,000,000) 1,000,000   (1,000,000) 0  
Recording (recovery) of provision for unfunded commitments of credit losses   1,000,000.0 $ (1,000,000)      
Financing receivable, modified specific reserve 3,400,000     3,400,000    
Nonaccrual 81,087,000     81,087,000   $ 93,853,000
Loans Past Due Over 90 Days Still Accruing 4,125,000     4,125,000   5,034,000
Nonaccrual loans with specific reserve 32,000,000.0     32,000,000.0   28,800,000
Interest income on nonaccrual loans       0 0  
Amortized cost 225,900,000     225,900,000   268,000,000.0
Financing receivable, individually evaluated for credit loss, interest income 2,800,000 1,300,000   8,400,000 3,700,000  
Amount of loan assessed for impairment on a quarterly basis       2,000,000.0    
Revolver loans converted to term loans       $ 49,800,000 $ 45,300,000  
Number of revolving loans convert to term loans | loan       186 180  
Number of loans | loan       7 8  
Loans, ending balance 4,200,000 $ 1,100,000   $ 4,200,000 $ 1,100,000  
Postmodification balance       115,554,000   $ 122,675,000
Financing receivable, modifications, underwritten the interest rate basis points           0.0012
Loans payable 109,300,000     109,300,000    
Hurricane Deferred Loans            
Financing Receivable Allowance For Credit Losses [Line Items]            
Financing receivable, modified specific reserve 6,000,000     6,000,000   $ 33,400,000
13 Modified Loan Borrowers            
Financing Receivable Allowance For Credit Losses [Line Items]            
Financial receivable, excluding accrued interest, modified in period, premodification       4,300,000 $ 1,200,000  
Borrowers Experiencing Financial Difficulty            
Financing Receivable Allowance For Credit Losses [Line Items]            
Financial receivable, excluding accrued interest, modified in period, premodification       $ 112,100,000    
Number of loans | loan       11    
Loans, ending balance 95,800,000     $ 95,800,000    
Loan balance, nonaccrual 85,656     $ 85,656    
Three Modified Loans            
Financing Receivable Allowance For Credit Losses [Line Items]            
Number of loans | loan           3
Postmodification balance           $ 91,400,000
Three New Loans Underwritten            
Financing Receivable Allowance For Credit Losses [Line Items]            
Number of loans | loan           3
One Loan Charged-Off            
Financing Receivable Allowance For Credit Losses [Line Items]            
Number of loans | loan           1
Financing receivable, modified ,one of loans charged off           $ 26,100,000
Modified Loans Collateral Dependent            
Financing Receivable Allowance For Credit Losses [Line Items]            
Number of loans | loan       6    
Hurricane            
Financing Receivable Allowance For Credit Losses [Line Items]            
Provision for credit losses on loans           16,700,000
Total Past Due | Borrowers Experiencing Financial Difficulty            
Financing Receivable Allowance For Credit Losses [Line Items]            
Loans, ending balance 95,700,000     $ 95,700,000    
Residential real estate loans            
Financing Receivable Allowance For Credit Losses [Line Items]            
Provision for credit losses on loans 4,903,000     12,106,000    
Commercial and industrial            
Financing Receivable Allowance For Credit Losses [Line Items]            
Provision for credit losses on loans 2,632,000     14,549,000    
Nonaccrual 4,349,000     4,349,000   10,931,000
Loans Past Due Over 90 Days Still Accruing $ 1,456,000     1,456,000   2,263,000
Postmodification balance       $ 59,990,000   $ 69,871,000
Minimum | Construction / Land Development and Other Commercial Real Estate Loans            
Financing Receivable Allowance For Credit Losses [Line Items]            
Loans collateralized by first liens on real estate amortized period       15 years    
Loans collateralized by first liens on real estate balloon payments due period       1 year    
Minimum | Commercial and industrial            
Financing Receivable Allowance For Credit Losses [Line Items]            
Commercial loans terms       1 year    
Inventory financing percentage 50.00%     50.00%    
Minimum | Commercial and industrial | Loans Past Due 30-59 Days            
Financing Receivable Allowance For Credit Losses [Line Items]            
Accounts receivable financed percentage 50.00%     50.00%    
Maximum | Construction / Land Development and Other Commercial Real Estate Loans            
Financing Receivable Allowance For Credit Losses [Line Items]            
Loans collateralized by first liens on real estate amortized period       30 years    
Loans collateralized by first liens on real estate balloon payments due period       5 years    
Percentage of loan value of improved property       85.00%    
Percentage of loan value of raw land       65.00%    
Percentage of loan value of land to be acquired and developed       75.00%    
Maximum | Residential real estate loans            
Financing Receivable Allowance For Credit Losses [Line Items]            
Loan-to-value ratio       90.00%    
Maximum | Commercial and industrial            
Financing Receivable Allowance For Credit Losses [Line Items]            
Commercial loans terms       7 years    
Inventory financing percentage 80.00%     80.00%    
Maximum | Commercial and industrial | Loans Past Due 30-59 Days            
Financing Receivable Allowance For Credit Losses [Line Items]            
Accounts receivable financed percentage 80.00%     80.00%