Related Party Transactions (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) trust	Dec. 31, 2021 USD ($)	Dec. 31, 2015 USD ($)
Related Party Transaction [Line Items]
Mortgage loan	$ 505,730,000	$ 487,304,000
Robert L. Moody, Jr.
Related Party Transaction [Line Items]
Commission paid under agency contracts	$ 46,507	155,107
Moody Bancshares, Inc. | The Company
Related Party Transaction [Line Items]
Percentage of ownership	9.40%
Number of separate trusts | trust	4
Moody Bank Holding | Moody Bancshares, Inc.
Related Party Transaction [Line Items]
Percentage of ownership	100.00%
MNB
Related Party Transaction [Line Items]
Commission and service fees expense	$ 486,813	536,101
Payments for rent	$ 32,101	32,101
MNB | Moody Bank Holding
Related Party Transaction [Line Items]
Percentage of ownership	98.50%
American National Insurance Company
Related Party Transaction [Line Items]
Premiums paid during the year	$ 116,314	642,099
Reimbursements for claim costs	1,506,422	3,021,197
Premium received	1,569,190	3,147,080
American National Insurance Company | The Westcap Corporation
Related Party Transaction [Line Items]
Undivided participation in mortgage			24.93%
Mortgage loan		17,900,000	$ 20,000,000
Percentage of commercial mortgage			24.93%
American National Registered Investment Advisory
Related Party Transaction [Line Items]
Professional fees	29,753	$ 58,032
Todd M. Wallace | Jones, Lang, LaSalle Brokerage, Inc. (JLL) | Leasing Agent Agreement
Related Party Transaction [Line Items]
Payments under agreements	180,208
Todd M. Wallace | Jones, Lang, LaSalle Brokerage, Inc. (JLL) | Services Agreement
Related Party Transaction [Line Items]
Payments under agreements	$ 0