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Loans Held for Investment and Allowance for Loan Losses - Schedule of Past Due Loans (Detail) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due $ 18,395 $ 22,292 $ 21,373
Total Current 5,286,207 5,148,741 5,231,694
Total Loans 5,304,602 5,171,033 5,253,067
Total 90 Days Past Due Still Accruing 113 92
C&I [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 983,103 1,131,382  
Municipal [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 179,356 181,325  
Construction & Development [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 550,928 553,959  
Farm [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 185,288 152,237  
Non-Owner Occupied CRE [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 673,608 617,686  
Owner Occupied CRE [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 820,055 746,974  
Residential [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 1,328,474 1,248,409  
Auto [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 383,764 353,595  
Non-Auto [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 104,814 90,602  
Commercial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 6,025 4,629 5,166
Total Current 1,156,434 1,308,078 1,504,288
Total Loans 1,162,459 1,312,707 1,509,454
Total 90 Days Past Due Still Accruing   21  
Commercial [Member] | C&I [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 4,369 4,629  
Total Current 978,734 1,126,753  
Total Loans 983,103 1,131,382  
Total 90 Days Past Due Still Accruing   21  
Commercial [Member] | Municipal [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 1,656    
Total Current 177,700 181,325  
Total Loans 179,356 181,325  
Agriculture [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 238 288 1,095
Total Current 94,974 94,576 96,353
Total Loans 95,212 94,864 97,448
Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 11,667 16,353 14,514
Total Current 3,546,686 3,302,912 3,220,694
Total Loans 3,558,353 3,319,265 3,235,208
Total 90 Days Past Due Still Accruing   33  
Real Estate [Member] | Construction & Development [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 2,135 4,819  
Total Current 548,793 549,140  
Total Loans 550,928 553,959  
Real Estate [Member] | Farm [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 1,138 708  
Total Current 184,150 151,529  
Total Loans 185,288 152,237  
Real Estate [Member] | Non-Owner Occupied CRE [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 1,057 613  
Total Current 672,551 617,073  
Total Loans 673,608 617,686  
Real Estate [Member] | Owner Occupied CRE [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 918 1,848  
Total Current 819,137 745,126  
Total Loans 820,055 746,974  
Real Estate [Member] | Residential [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 6,419 8,365  
Total Current 1,322,055 1,240,044  
Total Loans 1,328,474 1,248,409  
Total 90 Days Past Due Still Accruing   33  
Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 465 1,022 598
Total Current 488,113 443,175 410,359
Total Loans 488,578 444,197 410,957
Total 90 Days Past Due Still Accruing   59 92
Consumer [Member] | Auto [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 410 784  
Total Current 383,354 352,811  
Total Loans 383,764 353,595  
Total 90 Days Past Due Still Accruing   59  
Consumer [Member] | Non-Auto [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 55 238  
Total Current 104,759 90,364  
Total Loans 104,814 90,602  
15-59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 15,705 20,166 19,731
15-59 Days Past Due [Member] | Commercial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 5,088 3,647 4,563
15-59 Days Past Due [Member] | Commercial [Member] | C&I [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 3,432 3,647  
15-59 Days Past Due [Member] | Commercial [Member] | Municipal [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 1,656    
15-59 Days Past Due [Member] | Agriculture [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 193 193 1,080
15-59 Days Past Due [Member] | Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 10,050 15,561 13,678
15-59 Days Past Due [Member] | Real Estate [Member] | Construction & Development [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 1,973 4,775  
15-59 Days Past Due [Member] | Real Estate [Member] | Farm [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 1,138 708  
15-59 Days Past Due [Member] | Real Estate [Member] | Non-Owner Occupied CRE [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 896 613  
15-59 Days Past Due [Member] | Real Estate [Member] | Owner Occupied CRE [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 97 1,393  
15-59 Days Past Due [Member] | Real Estate [Member] | Residential [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 5,946 8,072  
15-59 Days Past Due [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 374 765 410
15-59 Days Past Due [Member] | Consumer [Member] | Auto [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 330 551  
15-59 Days Past Due [Member] | Consumer [Member] | Non-Auto [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 44 214  
60-89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 2,138 1,067 682
60-89 Days Past Due [Member] | Commercial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 707 406 474
60-89 Days Past Due [Member] | Commercial [Member] | C&I [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 707 406  
60-89 Days Past Due [Member] | Agriculture [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 10 95 15
60-89 Days Past Due [Member] | Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 1,355 384 110
60-89 Days Past Due [Member] | Real Estate [Member] | Construction & Development [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due   44  
60-89 Days Past Due [Member] | Real Estate [Member] | Non-Owner Occupied CRE [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 161    
60-89 Days Past Due [Member] | Real Estate [Member] | Owner Occupied CRE [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 821 322  
60-89 Days Past Due [Member] | Real Estate [Member] | Residential [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 373 18  
60-89 Days Past Due [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 66 182 83
60-89 Days Past Due [Member] | Consumer [Member] | Auto [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 55 158  
60-89 Days Past Due [Member] | Consumer [Member] | Non-Auto [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 11 24  
Greater than 90 Days [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 552 1,059 960
Greater than 90 Days [Member] | Commercial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 230 576 129
Greater than 90 Days [Member] | Commercial [Member] | C&I [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 230 576  
Greater than 90 Days [Member] | Agriculture [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 35    
Greater than 90 Days [Member] | Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 262 408 726
Greater than 90 Days [Member] | Real Estate [Member] | Construction & Development [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 162    
Greater than 90 Days [Member] | Real Estate [Member] | Owner Occupied CRE [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due   133  
Greater than 90 Days [Member] | Real Estate [Member] | Residential [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 100 275  
Greater than 90 Days [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 25 75 $ 105
Greater than 90 Days [Member] | Consumer [Member] | Auto [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due $ 25 $ 75