Loans And Allowance For Credit Losses - Loans Held-for-Investment by Portfolio Segment (Detail) - USD ($) $ in Thousands		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Loans And Leases Receivable Disclosure [Line Items]
Total Loans		$ 6,441,868	$ 5,388,972
Less - allowance for credit losses		(75,834)	(63,465)	$ (66,534)
Net loans held – for -investment		6,366,034	5,325,507
Commercial [Member]
Loans And Leases Receivable Disclosure [Line Items]
Total Loans		1,138,407	1,014,980
Agricultural [Member]
Loans And Leases Receivable Disclosure [Line Items]
Total Loans		76,947	98,089
Less - allowance for credit losses		(1,041)	(1,597)	(1,255)
Real Estate [Member]
Loans And Leases Receivable Disclosure [Line Items]
Total Loans		4,527,995	3,746,519
Consumer [Member]
Loans And Leases Receivable Disclosure [Line Items]
Total Loans		698,519	529,384
C&I [Member]
Loans And Leases Receivable Disclosure [Line Items]
Total Loans		917,317	837,075
Less - allowance for credit losses		(16,129)	(12,280)	(13,609)
C&I [Member] | Commercial [Member]
Loans And Leases Receivable Disclosure [Line Items]
Total Loans	[1]	917,317	837,075
Muncipal [Member]
Loans And Leases Receivable Disclosure [Line Items]
Total Loans		221,090	177,905
Less - allowance for credit losses		(1,026)	(348)	(1,552)
Muncipal [Member] | Commercial [Member]
Loans And Leases Receivable Disclosure [Line Items]
Total Loans		221,090	177,905
Construction & Development [Member]
Loans And Leases Receivable Disclosure [Line Items]
Total Loans		959,426	749,793
Less - allowance for credit losses		(26,443)	(17,627)	(13,512)
Construction & Development [Member] | Real Estate [Member]
Loans And Leases Receivable Disclosure [Line Items]
Total Loans		959,426	749,793
Farm [Member]
Loans And Leases Receivable Disclosure [Line Items]
Total Loans		306,322	217,220
Less - allowance for credit losses		(1,957)	(663)	(1,876)
Farm [Member] | Real Estate [Member]
Loans And Leases Receivable Disclosure [Line Items]
Total Loans		306,322	217,220
Non - Owner Occupied CRE [Member]
Loans And Leases Receivable Disclosure [Line Items]
Total Loans		732,089	623,434
Less - allowance for credit losses		(9,075)	(10,722)	(8,391)
Non - Owner Occupied CRE [Member] | Real Estate [Member]
Loans And Leases Receivable Disclosure [Line Items]
Total Loans		732,089	623,434
Owner Occupied CRE [Member]
Loans And Leases Receivable Disclosure [Line Items]
Total Loans		954,400	821,653
Less - allowance for credit losses		(9,928)	(10,828)	(12,347)
Owner Occupied CRE [Member] | Real Estate [Member]
Loans And Leases Receivable Disclosure [Line Items]
Total Loans		954,400	821,653
Residential [Member]
Loans And Leases Receivable Disclosure [Line Items]
Total Loans		1,575,758	1,334,419
Less - allowance for credit losses		(9,075)	(8,133)	(12,601)
Residential [Member] | Real Estate [Member]
Loans And Leases Receivable Disclosure [Line Items]
Total Loans		1,575,758	1,334,419
Auto [Member]
Loans And Leases Receivable Disclosure [Line Items]
Total Loans		550,635	405,416
Less - allowance for credit losses		(845)	(896)	(1,020)
Auto [Member] | Consumer [Member]
Loans And Leases Receivable Disclosure [Line Items]
Total Loans		550,635	405,416
Non - Auto [Member]
Loans And Leases Receivable Disclosure [Line Items]
Total Loans		147,884	123,968
Less - allowance for credit losses		(315)	(371)	$ (371)
Non - Auto [Member] | Consumer [Member]
Loans And Leases Receivable Disclosure [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.