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Allowance for Credit Losses, Credit Quality and Other - Additional Information (Detail)
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2025
USD ($)
loan
Mar. 31, 2024
USD ($)
loan
Dec. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
loan
Financing Receivable Allowance For Credit Losses [Line Items]        
Net recoveries $ 4,064,000 $ (3,440,000) $ (57,314,000)  
Provision for credit losses on loans 0 5,500,000    
Recovery of credit losses - unfunded commitments 0 (1,000,000)    
Financing receivable, modified specific reserve 4,200,000      
Nonaccrual 86,383,000   93,853,000 $ 93,853,000
Loans Past Due Over 90 Days Still Accruing 3,264,000   5,034,000 5,034,000
Nonaccrual loans with specific reserve 28,400,000   28,800,000 28,800,000
Interest income on nonaccrual loans 0 0    
Amortized cost 241,100,000   268,000,000.0 268,000,000.0
Financing receivable, individually evaluated for credit loss, interest income 3,000,000.0 685,000    
Amount of loan assessed for impairment on a quarterly basis 2,000,000.0      
Revolver loans converted to term loans $ 15,200,000 $ 10,300,000    
Number of revolving loans convert to term loans | loan 44 61    
Number of loans | loan 4 3    
Loans, ending balance $ 3,900,000 $ 656,000    
Postmodification balance 122,180,000     $ 122,675,000
Financing receivable, modifications, underwritten the interest rate basis points       0.0012
Loans payable 113,300,000      
Hurricane Deferred Loans        
Financing Receivable Allowance For Credit Losses [Line Items]        
Financing receivable, modified specific reserve 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 4,000,000.0 668,000    
Borrowers Experiencing Financial Difficulty        
Financing Receivable Allowance For Credit Losses [Line Items]        
Financial receivable, excluding accrued interest, modified in period, premodification $ 112,300,000      
Number of loans | loan 16      
Loans, ending balance $ 100,200,000      
Loan balance, nonaccrual $ 1,200,000      
Three Modified Loans        
Financing Receivable Allowance For Credit Losses [Line Items]        
Number of loans | loan       3
Postmodification balance       $ 95,000,000
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 $ 99,000,000      
Residential real estate loans        
Financing Receivable Allowance For Credit Losses [Line Items]        
Net recoveries (24,000) (140,000) (6,747,000)  
Provision for credit losses on loans 2,597,000      
Commercial and industrial        
Financing Receivable Allowance For Credit Losses [Line Items]        
Net recoveries 797,000 $ (1,645,000) (8,816,000)  
Provision for credit losses on loans 9,704,000      
Nonaccrual 7,619,000   10,931,000 10,931,000
Loans Past Due Over 90 Days Still Accruing 2,380,000   $ 2,263,000 2,263,000
Postmodification balance $ 65,936,000     $ 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%      
Minimum | Commercial and industrial | Loans Past Due 30-59 Days        
Financing Receivable Allowance For Credit Losses [Line Items]        
Accounts receivable financed percentage 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%      
Maximum | Commercial and industrial | Loans Past Due 30-59 Days        
Financing Receivable Allowance For Credit Losses [Line Items]        
Accounts receivable financed percentage 80.00%