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 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Line of Credit Facility [Line Items]          
Interest expense $ 241 $ 229 $ 672 $ 547  
Guarantee obligations, maximum exposure 138,500   138,500    
Maximum unpaid loan amount for which guarantee obligations granted 831,200   831,200    
Allowance for loss sharing obligations 778   778   $ 275
Guarantor obligations, amount pledged 180   180   $ 16
Other commitment amount 15,200   15,200    
Revolving Credit Facility | Credit Facility | Line of Credit          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity 10,000   10,000    
Standby letters of credit borrowing capacity 3,000   3,000    
Standby letters of credit, utilized amount 1,050   $ 1,050    
Credit agreement, unused capacity, commitment fee percentage     0.50%    
Interest expense 50 $ 94 $ 101 $ 141  
Credit agreement, amount outstanding 0   0    
Total liquidity, minimum requirement 100,000   100,000    
Average daily cash balance, minimum requirement $ 35,000   $ 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%