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Employee Benefits - Additional information (Detail) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 01, 2022
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Defined Benefit Plan, Plan Assets, Contributions by Employer   $ 48,000 $ 44,000 $ 104,000 $ 99,000  
Pension Cost (Reversal of Cost)       $ (14,000)   $ 1,300,000
Funded percentage   100.00%   100.00%    
Withdrawal liability amount           1,500,000
Withdrawal Liability Paid           200,000
Deferred Compensation Liability, Current and Noncurrent   $ 1,970,000   $ 1,970,000   1,830,000
Pension Plan [Member]            
Percentage of funding status 96.24%          
Pentegra DB Plan [Member]            
Pension Cost (Reversal of Cost)   (14,000) 50,000 (14,000) 100,000  
Salary Continuation Plan [Member] | Supplemental Employee Retirement Plan [Member]            
Liability, Defined Benefit Plan   $ 698,000   $ 698,000   660,000
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate   5.00%   5.00%    
Employee salary incremental percent       3.00%    
Defined Contribution Plan, Cost   $ 33,000 20,000 $ 66,000 41,000  
Deferred Directors Supplemental Retirement Plan [Member] | Supplemental Employee Retirement Plan [Member]            
Pension Cost (Reversal of Cost)   19,000 $ 13,000 38,000 $ 32,000  
Liability, Defined Benefit Plan   $ 544,000   $ 544,000   $ 537,000
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate   6.25%   6.25%   6.25%
Defined Contribution Plan, Cost       $ 20,000    
Previous final base fee, percentage       70.00%    
Revised fixed annual retirement benefits, payable       $ 200,000    
Deferred Compensation Liability, Current and Noncurrent   $ 694,000   $ 694,000   $ 553,000