Loans and Allowance for Credit Losses - Allowance for Credit Losses Based on Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Allowance for loan losses [Abstract]
Allowance for credit losses, Beginning Balance	$ 58,719	$ 59,075	$ 59,093	$ 54,655	$ 54,655
Initial allowance on loans purchased with credit deterioration	3,791		3,791	863
Provision for credit loss expense	5,911	142	5,552	4,001	4,806
Loans charged off	521	833	1,581	2,178	2,950
Recoveries collected	341	393	1,386	1,436	1,719
Allowance for credit losses, Ending Balance	68,241	58,777	68,241	58,777	59,093
Cumulative Change in Accounting Principal, Adjustment | ASU 2016-13
Allowance for loan losses [Abstract]
Allowance for credit losses, Beginning Balance				863	863
Construction and Land Development | Real Estate Loan
Allowance for loan losses [Abstract]
Allowance for credit losses, Beginning Balance	2,208	2,042	2,250	1,743	1,743
Initial allowance on loans purchased with credit deterioration	308		308	272
Provision for credit loss expense	219	1	191	30	137
Loans charged off	0	0	14	2	2
Recoveries collected	0	100	0	100	100
Allowance for credit losses, Ending Balance	2,735	2,143	2,735	2,143	2,250
Construction and Land Development | Real Estate Loan | Cumulative Change in Accounting Principal, Adjustment | ASU 2016-13
Allowance for loan losses [Abstract]
Allowance for credit losses, Beginning Balance				272	272
Agricultural | Real Estate Loan
Allowance for loan losses [Abstract]
Allowance for credit losses, Beginning Balance	1,370	2,112	1,433	1,257	1,257
Initial allowance on loans purchased with credit deterioration	0		0	0
Provision for credit loss expense	27	(674)	(36)	181	176
Loans charged off	0	0	0	0	0
Recoveries collected	0	0	0	0	0
Allowance for credit losses, Ending Balance	1,397	1,438	1,397	1,438	1,433
Agricultural | Real Estate Loan | Cumulative Change in Accounting Principal, Adjustment | ASU 2016-13
Allowance for loan losses [Abstract]
Allowance for credit losses, Beginning Balance				0	0
Residential Properties | Real Estate Loan | 1-4 Family
Allowance for loan losses [Abstract]
Allowance for credit losses, Beginning Balance	3,247	3,523	3,742	2,330	2,330
Initial allowance on loans purchased with credit deterioration	124		124	3
Provision for credit loss expense	629	269	88	1,355	1,241
Loans charged off	21	45	77	186	191
Recoveries collected	91	19	193	264	359
Allowance for credit losses, Ending Balance	4,070	3,766	4,070	3,766	3,742
Residential Properties | Real Estate Loan | 1-4 Family | Cumulative Change in Accounting Principal, Adjustment | ASU 2016-13
Allowance for loan losses [Abstract]
Allowance for credit losses, Beginning Balance				3	3
Commercial | Real Estate Loan
Allowance for loan losses [Abstract]
Allowance for credit losses, Beginning Balance	28,014	28,856	28,157	26,246	26,246
Initial allowance on loans purchased with credit deterioration	1,066		1,066	478
Provision for credit loss expense	2,727	(796)	2,278	1,384	1,462
Loans charged off	0	7	25	414	414
Recoveries collected	16	8	347	367	385
Allowance for credit losses, Ending Balance	31,823	28,061	31,823	28,061	28,157
Commercial | Real Estate Loan | Cumulative Change in Accounting Principal, Adjustment | ASU 2016-13
Allowance for loan losses [Abstract]
Allowance for credit losses, Beginning Balance				478	478
Agricultural Loans
Allowance for loan losses [Abstract]
Allowance for credit losses, Beginning Balance	524	886	585	983	983
Initial allowance on loans purchased with credit deterioration	0		0	0
Provision for credit loss expense	245	(246)	450	(250)	(359)
Loans charged off	132	0	408	93	93
Recoveries collected	3	38	13	38	54
Allowance for credit losses, Ending Balance	640	678	640	678	585
Agricultural Loans | Cumulative Change in Accounting Principal, Adjustment | ASU 2016-13
Allowance for loan losses [Abstract]
Allowance for credit losses, Beginning Balance				0	0
Commercial and Industrial Loans
Allowance for loan losses [Abstract]
Allowance for credit losses, Beginning Balance	21,544	19,496	20,808	19,241	19,241
Initial allowance on loans purchased with credit deterioration	2,273		2,273	94
Provision for credit loss expense	1,697	1,271	2,202	1,343	2,135
Loans charged off	0	389	62	424	870
Recoveries collected	81	63	374	187	208
Allowance for credit losses, Ending Balance	25,595	20,441	25,595	20,441	20,808
Commercial and Industrial Loans | Cumulative Change in Accounting Principal, Adjustment | ASU 2016-13
Allowance for loan losses [Abstract]
Allowance for credit losses, Beginning Balance				94	94
Consumer Loans
Allowance for loan losses [Abstract]
Allowance for credit losses, Beginning Balance	1,812	2,160	2,118	2,855	2,855
Initial allowance on loans purchased with credit deterioration	20		20	16
Provision for credit loss expense	367	317	379	(42)	14
Loans charged off	368	392	995	1,059	1,380
Recoveries collected	150	165	459	480	613
Allowance for credit losses, Ending Balance	$ 1,981	$ 2,250	$ 1,981	2,250	2,118
Consumer Loans | Cumulative Change in Accounting Principal, Adjustment | ASU 2016-13
Allowance for loan losses [Abstract]
Allowance for credit losses, Beginning Balance				$ 16	$ 16