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, 2023	Dec. 31, 2022
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit losses		$ 176,213	$ 150,698
Loans collectively evaluated for credit losses		6,972,578	6,291,170
Total Loans		7,148,791	6,441,868
Agricultural [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit losses		1,459	679
Loans collectively evaluated for credit losses		83,431	76,268
Total Loans		84,890	76,947
Commercial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Total Loans		1,379,661	1,138,407
Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Total Loans		5,007,955	4,527,995
Consumer [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Total Loans		676,285	698,519
C&I [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit losses		22,765	29,382
Loans collectively evaluated for credit losses		1,142,046	887,935
Total Loans		1,164,811	917,317
C&I [Member] | Commercial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Total Loans	[1]	1,164,811	917,317
Muncipal [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit losses		733	58
Loans collectively evaluated for credit losses		214,117	221,032
Total Loans		214,850	221,090
Muncipal [Member] | Commercial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Total Loans		214,850	221,090
Construction & Development [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit losses		23,989	6,440
Loans collectively evaluated for credit losses		939,169	952,986
Total Loans		963,158	959,426
Construction & Development [Member] | Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Total Loans		963,158	959,426
Farm [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit losses		6,166	1,663
Loans collectively evaluated for credit losses		338,788	304,659
Total Loans		344,954	306,322
Farm [Member] | Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Total Loans		344,954	306,322
Non - Owner Occupied CRE [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit losses		37,139	38,358
Loans collectively evaluated for credit losses		790,830	693,731
Total Loans		827,969	732,089
Non - Owner Occupied CRE [Member] | Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Total Loans		827,969	732,089
Owner Occupied CRE [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit losses		42,568	36,206
Loans collectively evaluated for credit losses		994,713	918,194
Total Loans		1,037,281	954,400
Owner Occupied CRE [Member] | Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Total Loans		1,037,281	954,400
Residential [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit losses		37,906	35,983
Loans collectively evaluated for credit losses		1,796,687	1,539,775
Total Loans		1,834,593	1,575,758
Residential [Member] | Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Total Loans		1,834,593	1,575,758
Auto [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit losses		2,589	1,360
Loans collectively evaluated for credit losses		519,270	549,275
Total Loans		521,859	550,635
Auto [Member] | Consumer [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Total Loans		521,859	550,635
Non - Auto [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit losses		899	569
Loans collectively evaluated for credit losses		153,527	147,315
Total Loans		154,426	147,884
Non - Auto [Member] | Consumer [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Total Loans		$ 154,426	$ 147,884

[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.