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Loans and Allowance for Credit Losses - Summary of Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 5,852,630		$ 5,710,312
Less: loans held for sale	5,543		6,614
Total gross loans held for investment	5,847,087		5,703,698
Net deferred loan fees, premiums and discounts	28,592		37,850
Allowance for credit losses	72,925	$ 71,160	70,182	$ 68,774	$ 68,312	$ 68,675
Net loans	5,745,570		5,595,666
Real Estate Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	3,988,060		3,906,596
Construction and Land Development | Real Estate Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	336,925		236,258
Allowance for credit losses	4,686	4,066	3,275	2,674	2,646	2,918
Agricultural | Real Estate Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	368,062		391,436
Allowance for credit losses	1,265	1,322	1,361	1,342	1,372	1,366
Commercial | Real Estate Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	2,451,529		2,442,627
Allowance for credit losses	34,219	33,258	32,669	32,825	32,918	31,758
Agricultural Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	310,669		239,138
Allowance for credit losses	1,612	1,767	1,957	860	885	705
Commercial and Industrial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	1,353,613		1,340,865
Allowance for credit losses	25,964	25,618	25,602	25,569	24,931	25,450
Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	36,558		54,481
Allowance for credit losses	1,457	1,513	1,739	1,823	1,980	2,258
All Other Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	163,730		169,232
1-4 Family | Residential Properties | Real Estate Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	500,134		502,243
Allowance for credit losses	3,722	$ 3,616	3,579	$ 3,681	$ 3,580	$ 4,220
Multifamily | Residential Properties | Real Estate Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 331,410		$ 334,032

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