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Related Party Transactions (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2015
Related Party Transaction [Line Items]      
Mortgage loan $ 487,304,000 $ 332,521,000  
Robert L. Moody, Jr.      
Related Party Transaction [Line Items]      
Commission paid under agency contracts 155,107 182,957  
RMS      
Related Party Transaction [Line Items]      
Management fees 2,000 0  
MNB      
Related Party Transaction [Line Items]      
Commission and service fees expense 536,101 582,150  
Payments for rent 32,101 32,101  
American National Insurance Company      
Related Party Transaction [Line Items]      
Premiums paid during the year 642,099 840,802  
Reimbursements for claim costs 3,021,197 2,635,164  
Premium received 3,147,080 2,744,962  
American National Registered Investment Advisory      
Related Party Transaction [Line Items]      
Professional fees $ 58,032 47,778  
The Company | Moody Bancshares, Inc.      
Related Party Transaction [Line Items]      
Percentage of ownership 9.40%    
RCC | RMS      
Related Party Transaction [Line Items]      
Percentage of ownership 1.00%    
Three R Trusts | RMS      
Related Party Transaction [Line Items]      
Percentage of ownership 99.00%    
Three R Trusts | RCC      
Related Party Transaction [Line Items]      
Percentage of ownership 100.00%    
Moody Bancshares, Inc. | Moody Bank Holding      
Related Party Transaction [Line Items]      
Percentage of ownership 100.00%    
Moody Bank Holding | MNB      
Related Party Transaction [Line Items]      
Percentage of ownership 98.50%    
The Westcap Corporation | American National Insurance Company      
Related Party Transaction [Line Items]      
Undivided participation in mortgage     24.93%
Mortgage loan $ 17,900,000 $ 18,500,000 $ 20,000,000
Percentage of commercial mortgage     24.93%