Loans And Allowance For Credit Losses - Schedule of Past Due Loans (Detail) - USD ($) $ in Thousands		Dec. 31, 2021	Dec. 31, 2020
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		$ 5,389,000	$ 5,171,000
Total Loans		5,388,972	5,171,033
Total 90 Days Past Due Still Accruing		8	113
Financing Receivables15 To59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	[1]	14,005	20,166
Financial Asset, 60 to 89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		665	1,067
Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		915	1,059
Financial Asset, Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		15,585	22,292
Financial Asset, Not Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		5,373,387	5,148,741
C&I [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		837,000	1,131,000
Total Loans		837,075	1,131,382
Muncipal [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		178,000	181,000
Total Loans		177,905	181,325
Construction & Development [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		750,000	554,000
Total Loans		749,793	553,959
Farm [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		217,000	152,000
Total Loans		217,220	152,237
Non - Owner Occupied CRE [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		624,000	618,000
Total Loans		623,434	617,686
Owner Occupied CRE [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		822,000	747,000
Total Loans		821,653	746,974
Residential [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		1,334,000	1,248,000
Total Loans		1,334,419	1,248,409
Auto [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		405,000	354,000
Total Loans		405,416	353,595
Non - Auto [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		124,000	91,000
Total Loans		123,968	90,602
Commercial [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans		1,014,980	1,312,707
Total 90 Days Past Due Still Accruing		5	21
Commercial [Member] | Financing Receivables15 To59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	[1]	3,701
Total Loans	[1]		3,647
Commercial [Member] | Financial Asset, 60 to 89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		34	406
Commercial [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		222	576
Commercial [Member] | Financial Asset, Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		3,957	4,629
Commercial [Member] | Financial Asset, Not Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		1,011,023	1,308,078
Commercial [Member] | C&I [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans		837,075	1,131,382
Total 90 Days Past Due Still Accruing		5	21
Commercial [Member] | C&I [Member] | Financing Receivables15 To59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	[1]	3,638	3,647
Commercial [Member] | C&I [Member] | Financial Asset, 60 to 89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		34	406
Commercial [Member] | C&I [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		222	576
Commercial [Member] | C&I [Member] | Financial Asset, Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		3,894	4,629
Commercial [Member] | C&I [Member] | Financial Asset, Not Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		833,181	1,126,753
Commercial [Member] | Muncipal [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans		177,905	181,325
Total 90 Days Past Due Still Accruing
Commercial [Member] | Muncipal [Member] | Financing Receivables15 To59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	[1]	63	0
Commercial [Member] | Muncipal [Member] | Financial Asset, 60 to 89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due
Commercial [Member] | Muncipal [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due
Commercial [Member] | Muncipal [Member] | Financial Asset, Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		63
Commercial [Member] | Muncipal [Member] | Financial Asset, Not Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		177,842	181,325
Agricultural [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		98,000	95,000
Total Loans		98,089	94,864
Total 90 Days Past Due Still Accruing
Agricultural [Member] | Financing Receivables15 To59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	[1]	181	193
Agricultural [Member] | Financial Asset, 60 to 89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due			95
Agricultural [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due
Agricultural [Member] | Financial Asset, Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		181	288
Agricultural [Member] | Financial Asset, Not Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		97,908	94,576
Real Estate [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans		3,746,519	3,319,265
Total 90 Days Past Due Still Accruing			33
Real Estate [Member] | Financing Receivables15 To59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	[1]	9,585	15,561
Real Estate [Member] | Financial Asset, 60 to 89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		581	384
Real Estate [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		690	408
Real Estate [Member] | Financial Asset, Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		10,856	16,353
Real Estate [Member] | Financial Asset, Not Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		3,735,663	3,302,912
Real Estate [Member] | Construction & Development [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans		749,793	553,959
Total 90 Days Past Due Still Accruing
Real Estate [Member] | Construction & Development [Member] | Financing Receivables15 To59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	[1]	2,953	4,775
Real Estate [Member] | Construction & Development [Member] | Financial Asset, 60 to 89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		39	44
Real Estate [Member] | Construction & Development [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due
Real Estate [Member] | Construction & Development [Member] | Financial Asset, Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due			4,819
Total Loans		2,992
Real Estate [Member] | Construction & Development [Member] | Financial Asset, Not Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		746,801	549,140
Real Estate [Member] | Farm [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans		217,220	152,237
Total 90 Days Past Due Still Accruing
Real Estate [Member] | Farm [Member] | Financing Receivables15 To59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	[1]	600	708
Real Estate [Member] | Farm [Member] | Financial Asset, 60 to 89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		215
Real Estate [Member] | Farm [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due
Total Loans
Real Estate [Member] | Farm [Member] | Financial Asset, Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		815	708
Real Estate [Member] | Farm [Member] | Financial Asset, Not Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		216,405	151,529
Real Estate [Member] | Non - Owner Occupied CRE [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans		623,434	617,686
Total 90 Days Past Due Still Accruing
Real Estate [Member] | Non - Owner Occupied CRE [Member] | Financing Receivables15 To59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	[1]	235	613
Real Estate [Member] | Non - Owner Occupied CRE [Member] | Financial Asset, 60 to 89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due
Real Estate [Member] | Non - Owner Occupied CRE [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due
Real Estate [Member] | Non - Owner Occupied CRE [Member] | Financial Asset, Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		235	613
Real Estate [Member] | Non - Owner Occupied CRE [Member] | Financial Asset, Not Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		623,199	617,073
Real Estate [Member] | Owner Occupied CRE [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans		821,653	746,974
Total 90 Days Past Due Still Accruing
Real Estate [Member] | Owner Occupied CRE [Member] | Financing Receivables15 To59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	[1]		1,393
Total Loans	[1]	813
Real Estate [Member] | Owner Occupied CRE [Member] | Financial Asset, 60 to 89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due			322
Real Estate [Member] | Owner Occupied CRE [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		280	133
Real Estate [Member] | Owner Occupied CRE [Member] | Financial Asset, Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		1,093	1,848
Real Estate [Member] | Owner Occupied CRE [Member] | Financial Asset, Not Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		820,560	745,126
Real Estate [Member] | Residential [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans		1,334,419	1,248,409
Total 90 Days Past Due Still Accruing			33
Real Estate [Member] | Residential [Member] | Financing Receivables15 To59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	[1]	4,984	8,072
Real Estate [Member] | Residential [Member] | Financial Asset, 60 to 89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		327	18
Real Estate [Member] | Residential [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		410	275
Real Estate [Member] | Residential [Member] | Financial Asset, Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		5,721	8,365
Real Estate [Member] | Residential [Member] | Financial Asset, Not Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		1,328,698	1,240,044
Consumer [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans		529,384	444,197
Total 90 Days Past Due Still Accruing		3	59
Consumer [Member] | Financing Receivables15 To59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	[1]	538	765
Consumer [Member] | Financial Asset, 60 to 89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		50	182
Consumer [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		3	75
Consumer [Member] | Financial Asset, Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		591	1,022
Consumer [Member] | Financial Asset, Not Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		528,793	443,175
Consumer [Member] | Auto [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans		405,416	353,595
Total 90 Days Past Due Still Accruing			59
Consumer [Member] | Auto [Member] | Financing Receivables15 To59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	[1]	393	551
Consumer [Member] | Auto [Member] | Financial Asset, 60 to 89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		26	158
Consumer [Member] | Auto [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due			75
Consumer [Member] | Auto [Member] | Financial Asset, Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		419	784
Consumer [Member] | Auto [Member] | Financial Asset, Not Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		404,997	352,811
Consumer [Member] | Non - Auto [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans		123,968	90,602
Total 90 Days Past Due Still Accruing		3
Consumer [Member] | Non - Auto [Member] | Financing Receivables15 To59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	[1]	145	214
Consumer [Member] | Non - Auto [Member] | Financial Asset, 60 to 89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		24	24
Consumer [Member] | Non - Auto [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		3
Consumer [Member] | Non - Auto [Member] | Financial Asset, Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		172	238
Consumer [Member] | Non - Auto [Member] | Financial Asset, Not Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		$ 123,796	$ 90,364

[1] The Company monitors commercial, agricultural and real estate loans after such loans are 15 days past due. Consumer loans are monitored after such loans are 30 days past due.