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 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Sep. 25, 2023
Line of Credit Facility [Line Items]            
Guarantee obligations, maximum exposure $ 194,700   $ 194,700      
Maximum unpaid loan amount for which guarantee obligations granted 1,168,300   1,168,300      
Allowance for loss sharing obligations 1,039   1,039   $ 851  
Guarantor obligations, amount pledged 532   532   $ 283  
Other commitment amount 22,500   22,500      
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   3,000      
Standby letters of credit, utilized amount 1,050   $ 1,050      
Line of credit facility bearing interest rate     1.75%      
Credit agreement, unused capacity, commitment fee percentage     0.50%      
Interest expense 33 $ 26 $ 63 $ 51    
Credit agreement, amount outstanding 0   0      
Total liquidity, minimum requirement 100,000   100,000      
Average daily cash balance, minimum requirement 35,000   35,000      
Minimum average cash deposits $ 10,000   $ 10,000      
Credit agreement, pledge percentage     100.00%