Loan And Allowance For Credit Losses - Schedule of Investment in Loans Related to Balance in Allowance for Loan Losses on Basis of Company's Impairment Methodology (Detail) - USD ($) $ in Thousands		Dec. 31, 2022	Dec. 31, 2021
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit losses		$ 150,698	$ 161,185
Loans collectively evaluated for credit losses		6,291,170	5,227,787
Total Loans		6,441,868	5,388,972
Agricultural [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit losses		679	5,398
Loans collectively evaluated for credit losses		76,268	92,691
Total Loans		76,947	98,089
Commercial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Total Loans		1,138,407	1,014,980
Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Total Loans		4,527,995	3,746,519
Consumer [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Total Loans		698,519	529,384
C&I [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit losses		29,382	24,391
Loans collectively evaluated for credit losses		887,935	812,684
Total Loans		917,317	837,075
C&I [Member] | Commercial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Total Loans	[1]	917,317	837,075
Muncipal [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit losses		58	109
Loans collectively evaluated for credit losses		221,032	177,796
Total Loans		221,090	177,905
Muncipal [Member] | Commercial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Total Loans		221,090	177,905
Construction & Development [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit losses		6,440	5,473
Loans collectively evaluated for credit losses		952,986	744,320
Total Loans		959,426	749,793
Construction & Development [Member] | Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Total Loans		959,426	749,793
Farm [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit losses		1,663	3,142
Loans collectively evaluated for credit losses		304,659	214,078
Total Loans		306,322	217,220
Farm [Member] | Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Total Loans		306,322	217,220
Non - Owner Occupied CRE [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit losses		38,358	34,468
Loans collectively evaluated for credit losses		693,731	588,966
Total Loans		732,089	623,434
Non - Owner Occupied CRE [Member] | Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Total Loans		732,089	623,434
Owner Occupied CRE [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit losses		36,206	48,504
Loans collectively evaluated for credit losses		918,194	773,149
Total Loans		954,400	821,653
Owner Occupied CRE [Member] | Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Total Loans		954,400	821,653
Residential [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit losses		35,983	37,570
Loans collectively evaluated for credit losses		1,539,775	1,296,849
Total Loans		1,575,758	1,334,419
Residential [Member] | Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Total Loans		1,575,758	1,334,419
Auto [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit losses		1,360	1,675
Loans collectively evaluated for credit losses		549,275	403,741
Total Loans		550,635	405,416
Auto [Member] | Consumer [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Total Loans		550,635	405,416
Non - Auto [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit losses		569	455
Loans collectively evaluated for credit losses		147,315	123,513
Total Loans		147,884	123,968
Non - Auto [Member] | Consumer [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Total Loans		$ 147,884	$ 123,968

[1] All disclosures for the C&I loan segment include PPP loan balances, net of deferred fees, as disclosed on the face of the consolidated balance sheet.