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Allowance for Credit Losses, Credit Quality and Other - Additional Information (Detail)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
loan
Dec. 31, 2024
USD ($)
Jun. 30, 2024
USD ($)
loan
Dec. 31, 2024
USD ($)
loan
Financing Receivable Allowance For Credit Losses [Line Items]            
Net recoveries $ (1,075,000) $ (2,438,000) $ 2,989,000 $ (54,876,000) $ (5,878,000)  
Provision for credit losses on loans 3,000,000 8,000,000 3,000,000   13,500,000  
Recovery of credit losses - unfunded commitments 0 0 0   1,000,000  
Financing receivable, modified specific reserve 4,000,000   4,000,000      
Nonaccrual 89,261,000   89,261,000 93,853,000   $ 93,853,000
Loans Past Due Over 90 Days Still Accruing 7,031,000   7,031,000 5,034,000   5,034,000
Nonaccrual loans with specific reserve 32,900,000   32,900,000 28,800,000   28,800,000
Interest income on nonaccrual loans     0   0  
Amortized cost 246,200,000   246,200,000 268,000,000.0   268,000,000.0
Financing receivable, individually evaluated for credit loss, interest income 3,000,000.0 368,000 6,000,000.0   737,000  
Amount of loan assessed for impairment on a quarterly basis     2,000,000.0      
Revolver loans converted to term loans     $ 35,700,000   $ 27,300,000  
Number of revolving loans convert to term loans | loan     103   114  
Number of loans | loan     6   8  
Loans, ending balance 4,100,000 968,000 $ 4,100,000   $ 968,000  
Postmodification balance     123,146,000     $ 122,675,000
Financing receivable, modifications, underwritten the interest rate basis points           0.0012
Loans payable 116,800,000   116,800,000      
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   $ 33,400,000
13 Modified Loan Borrowers            
Financing Receivable Allowance For Credit Losses [Line Items]            
Financial receivable, excluding accrued interest, modified in period, premodification     4,200,000   1,000,000.0  
Borrowers Experiencing Financial Difficulty            
Financing Receivable Allowance For Credit Losses [Line Items]            
Financial receivable, excluding accrued interest, modified in period, premodification     $ 112,200,000      
Number of loans | loan     12      
Loans, ending balance 100,800,000   $ 100,800,000      
Loan balance, nonaccrual 1,200,000   $ 1,200,000      
Three Modified Loans            
Financing Receivable Allowance For Credit Losses [Line Items]            
Number of loans | loan           3
Postmodification balance           $ 96,300,000
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      
Total Past Due | Borrowers Experiencing Financial Difficulty            
Financing Receivable Allowance For Credit Losses [Line Items]            
Loans, ending balance 99,600,000   $ 99,600,000      
Residential real estate loans            
Financing Receivable Allowance For Credit Losses [Line Items]            
Net recoveries (42,000) 17,000 (66,000) (6,764,000) (123,000)  
Provision for credit losses on loans 4,606,000   7,203,000      
Commercial and industrial            
Financing Receivable Allowance For Credit Losses [Line Items]            
Net recoveries (1,754,000) $ (1,754,000) (957,000) (7,062,000) $ (3,399,000)  
Provision for credit losses on loans 2,213,000   11,917,000      
Nonaccrual 4,030,000   4,030,000 10,931,000   10,931,000
Loans Past Due Over 90 Days Still Accruing $ 1,672,000   1,672,000 $ 2,263,000   2,263,000
Postmodification balance     $ 67,245,000     $ 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%