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Loans Held for Investment and Allowance for Loan Losses - Schedule of Past Due Loans (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due $ 18,777 $ 22,292 $ 34,283
Total Current 5,303,785 5,148,741 4,605,106
Total Loans 5,322,562 5,171,033 4,639,389
Total 90 Days Past Due Still Accruing 2 113 209
C&I [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 1,178,126 1,131,382  
Municipal [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 176,949 181,325  
Construction & Development [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 587,928 553,959  
Farm [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 162,046 152,237  
Non-Owner Occupied CRE [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 650,144 617,686  
Owner Occupied CRE [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 759,906 746,974  
Residential [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 1,254,727 1,248,409  
Auto [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 370,027 353,595  
Non-Auto [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 92,343 90,602  
Commercial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 4,074 4,629 5,577
Total Current 1,351,001 1,308,078 863,873
Total Loans 1,355,075 1,312,707 869,450
Total 90 Days Past Due Still Accruing 1 21 116
Commercial [Member] | C&I [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 4,055 4,629  
Total Current 1,174,071 1,126,753  
Total Loans 1,178,126 1,131,382  
Total 90 Days Past Due Still Accruing 1 21  
Commercial [Member] | Municipal [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 19    
Total Current 176,930 181,325  
Total Loans 176,949 181,325  
Agriculture [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 2,535 288 683
Total Current 87,831 94,576 98,899
Total Loans 90,366 94,864 99,582
Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 11,517 16,353 26,943
Total Current 3,403,234 3,302,912 3,222,306
Total Loans 3,414,751 3,319,265 3,249,249
Total 90 Days Past Due Still Accruing 1 33  
Real Estate [Member] | Construction & Development [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 1,917 4,819  
Total Current 586,011 549,140  
Total Loans 587,928 553,959  
Real Estate [Member] | Farm [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 71 708  
Total Current 161,975 151,529  
Total Loans 162,046 152,237  
Real Estate [Member] | Non-Owner Occupied CRE [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 695 613  
Total Current 649,449 617,073  
Total Loans 650,144 617,686  
Total 90 Days Past Due Still Accruing 0    
Real Estate [Member] | Owner Occupied CRE [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 1,847 1,848  
Total Current 758,059 745,126  
Total Loans 759,906 746,974  
Real Estate [Member] | Residential [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 6,987 8,365  
Total Current 1,247,740 1,240,044  
Total Loans 1,254,727 1,248,409  
Total 90 Days Past Due Still Accruing   33  
Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 651 1,022 1,080
Total Current 461,719 443,175 420,028
Total Loans 462,370 444,197 421,108
Total 90 Days Past Due Still Accruing   59 93
Consumer [Member] | Auto [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 511 784  
Total Current 369,516 352,811  
Total Loans 370,027 353,595  
Total 90 Days Past Due Still Accruing   59  
Consumer [Member] | Non-Auto [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 140 238  
Total Current 92,203 90,364  
Total Loans 92,343 90,602  
15-59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 17,965 20,166 32,078
15-59 Days Past Due [Member] | Commercial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 3,488 3,647 4,807
15-59 Days Past Due [Member] | Commercial [Member] | C&I [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 3,469 3,647  
15-59 Days Past Due [Member] | Commercial [Member] | Municipal [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 19    
15-59 Days Past Due [Member] | Agriculture [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 2,535 193 621
15-59 Days Past Due [Member] | Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 11,343 15,561 25,788
15-59 Days Past Due [Member] | Real Estate [Member] | Construction & Development [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 1,810 4,775  
15-59 Days Past Due [Member] | Real Estate [Member] | Farm [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 71 708  
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 695 613  
15-59 Days Past Due [Member] | Real Estate [Member] | Owner Occupied CRE [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 1,847 1,393  
15-59 Days Past Due [Member] | Real Estate [Member] | Residential [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 6,920 8,072  
15-59 Days Past Due [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 599 765 862
15-59 Days Past Due [Member] | Consumer [Member] | Auto [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 470 551  
15-59 Days Past Due [Member] | Consumer [Member] | Non-Auto [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 129 214  
60-89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 433 1,067 1,246
60-89 Days Past Due [Member] | Commercial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 283 406 388
60-89 Days Past Due [Member] | Commercial [Member] | C&I [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 283 406  
60-89 Days Past Due [Member] | Agriculture [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due   95  
60-89 Days Past Due [Member] | Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 108 384 742
60-89 Days Past Due [Member] | Real Estate [Member] | Construction & Development [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 41 44  
60-89 Days Past Due [Member] | Real Estate [Member] | Owner Occupied CRE [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due   322  
60-89 Days Past Due [Member] | Real Estate [Member] | Residential [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 67 18  
60-89 Days Past Due [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 42 182 116
60-89 Days Past Due [Member] | Consumer [Member] | Auto [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 31 158  
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 379 1,059 959
Greater than 90 Days [Member] | Commercial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 303 576 382
Greater than 90 Days [Member] | Commercial [Member] | C&I [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 303 576  
Greater than 90 Days [Member] | Agriculture [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due     62
Greater than 90 Days [Member] | Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 66 408 413
Greater than 90 Days [Member] | Real Estate [Member] | Construction & Development [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 66    
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   275  
Greater than 90 Days [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 10 75 $ 102
Greater than 90 Days [Member] | Consumer [Member] | Auto [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due $ 10 $ 75