v3.25.2
Loans and Lease Finance Receivables and Allowance for Credit Losses - Additional Information (Detail) - USD ($)
6 Months Ended 12 Months Ended 30 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2026
Jun. 30, 2026
Dec. 31, 2024
Dec. 31, 2027
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross $ 8,358,501,000       $ 8,536,432,000  
Loans pledged as collateral 4,480,000,000       4,440,000,000  
Carrying value of loans 6,310,000,000       6,310,000,000  
Loans held-for-sale 0       0  
Allowance for Credit Losses   $ 78,000,000     80,100,000  
Allowance for charge-offs 100,000          
Reserve for credit risk for undisbursed commitments 6,800,000       6,300,000  
Increase in reserve for unfunded loan commitments 500,000 $ 500,000        
Allowance For Credit Losses Increase Decrease         2,100,000  
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease), Total         2,100,000  
Allowance For Credit Losses Write Offs 6,800,000          
Financing Receivable, Modified, Accumulated 9,529,000       6,467,000  
Recapture of provision for credit losses $ 2,000,000          
Unemployment [Member] | Forecast [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Percentage of Increase Decrease In Macro Economic Factors     5.00%      
Commercial Real Estate Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Percentage of total gross loan portfolio (excluding PCI loans) 81.64%          
Notes receivable gross $ 6,517,415,000       6,507,452,000  
Construction [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Percentage of total gross loan portfolio (excluding PCI loans) 78.00%          
Notes receivable gross $ 17,658,000       16,082,000  
Modifications Of Loans To Borrowers Experiencing Financial Difficulty [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Modified, Accumulated 6,100,000          
Modifications Of Loans To Borrowers Experiencing Financial Difficulty [Member] | Commercial Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Modified, Accumulated 5,700,000          
Loans Secured by Dairy & Livestock Land [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Modified, Accumulated 400,000          
Loans, Excluding PCI Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 233,800,000       419,900,000  
Loans, Excluding PCI Loans [Member] | Dairy & Livestock Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 199,400,000       385,300,000  
Loans, Excluding PCI Loans [Member] | Agribusiness Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross $ 34,400,000       $ 34,600,000  
Loans, Excluding PCI Loans [Member] | Loans Secured by Farmland [Member] | Commercial Real Estate Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Percentage of total gross loan portfolio (excluding PCI loans) 6.40%       6.91%  
Notes receivable gross $ 417,200,000       $ 449,800,000  
Loans, Excluding PCI Loans [Member] | Loans Secured by Farmland [Member] | Dairy & Livestock Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 104,600,000       109,100,000  
Loans, Excluding PCI Loans [Member] | Loans Secured by Farmland [Member] | Loans Secured by Agricultural Land [Member] | Commercial Real Estate Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross $ 312,600,000       $ 340,700,000  
Maximum [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Percentage of total gross loan portfolio (excluding PCI loans)         0.94%  
Maximum [Member] | GDP [Member] | Forecast [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Percentage of Increase Decrease In Macro Economic Factors           2.00%
Minimum [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Percentage of total gross loan portfolio (excluding PCI loans) 0.93%          
Minimum [Member] | GDP [Member] | Forecast [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Percentage of Increase Decrease In Macro Economic Factors       1.00%