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Statement of Accounting Policies - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2021
USD ($)
county
Segment
Dec. 31, 2020
USD ($)
Summary Of Significant Accounting Policies [Line Items]    
Number of counties in which entity provides services | county 26  
Business segments | Segment 1  
Equity investments 20.00%  
Loans past due days 90 days  
Excess impaired credits $ 250,000  
Software purchases and developed are capitalized and amortized on straight-line basis 7 years  
Cumulative Effect Of New Accounting Principle In Period Of Adoption   $ 11,199,000
Retained Earnings [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Cumulative Effect Of New Accounting Principle In Period Of Adoption   11,199,000
Guaranteed Minimum Death Benefit [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Other liabilities $ 4,500,000 $ 4,600,000