Loan And Allowance For Credit Losses - Schedule of Allowance for Loan Losses by Portfolio Segment (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit losses	$ 14,541	$ 17,870
Loans collectively evaluated for credit losses	61,293	45,595
Total allowance for loan losses	75,834	63,465	$ 66,534
Agricultural [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit losses	398	1,445
Loans collectively evaluated for credit losses	643	152
Total allowance for loan losses	1,041	1,597	1,255
C&I [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit losses	8,398	6,627
Loans collectively evaluated for credit losses	7,731	5,653
Total allowance for loan losses	16,129	12,280	13,609
Muncipal [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit losses	0	0
Loans collectively evaluated for credit losses	1,026	348
Total allowance for loan losses	1,026	348	1,552
Construction & Development [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit losses	305	225
Loans collectively evaluated for credit losses	26,138	17,402
Total allowance for loan losses	26,443	17,627	13,512
Farm [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit losses	36	2
Loans collectively evaluated for credit losses	1,921	661
Total allowance for loan losses	1,957	663	1,876
Non - Owner Occupied CRE [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit losses	2,357	4,059
Loans collectively evaluated for credit losses	6,718	6,663
Total allowance for loan losses	9,075	10,722	8,391
Owner Occupied CRE [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit losses	1,600	3,481
Loans collectively evaluated for credit losses	8,328	7,347
Total allowance for loan losses	9,928	10,828	12,347
Residential [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit losses	1,444	2,026
Loans collectively evaluated for credit losses	7,631	6,107
Total allowance for loan losses	9,075	8,133	12,601
Auto [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit losses	2	4
Loans collectively evaluated for credit losses	843	892
Total allowance for loan losses	845	896	1,020
Non - Auto [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit losses	1	1
Loans collectively evaluated for credit losses	314	370
Total allowance for loan losses	$ 315	$ 371	$ 371