Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Narrative (Detail)

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Commitments and Contingencies - Narrative (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Line of Credit Facility [Line Items]      
Interest expense $ 199 $ 215  
Guarantee obligations, maximum exposure 186,800    
Maximum unpaid loan amount for which guarantee obligations granted 1,120,700    
Allowance for loss sharing obligations 986   $ 851
Guarantor obligations, amount pledged 402   $ 283
Other commitment amount 18,300    
Revolving Credit Facility | Credit Facility | Line of Credit      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity 10,000    
Standby letters of credit borrowing capacity 3,000    
Standby letters of credit, utilized amount $ 1,050    
Credit agreement, unused capacity, commitment fee percentage 0.50%    
Interest expense $ 30 $ 25  
Credit agreement, amount outstanding 0    
Total liquidity, minimum requirement 100,000    
Average daily cash balance, minimum requirement $ 35,000    
Credit agreement, pledge percentage 100.00%    
Revolving Credit Facility | Secured Overnight Financing Rate (SOFR) | Credit Facility | Line of Credit      
Line of Credit Facility [Line Items]      
Line of credit facility bearing interest rate 1.75%