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Loans Held for Investment and Allowance for Loan Losses - Schedule of loans that are individually evaluated for credit losses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Jun. 30, 2021
Dec. 31, 2020
Financing Receivable, Impaired [Line Items]        
Unpaid Contractual Principal Balance $ 53,588 $ 53,588    
Recorded Investment With No Allowance 21,638 21,638    
Recorded Investment With Allowance 17,682 17,682    
Total Recorded Investment 39,320 39,320 $ 174,994 $ 197,451
Related Allowance 3,046 3,046 17,186 20,637
Average Recorded Investment 41,410 42,681    
Collateral Pledged [Member]        
Financing Receivable, Impaired [Line Items]        
Recorded Investment With No Allowance     20,209 21,439
Recorded Investment With Allowance     9,577 21,180
Related Allowance     1,669 3,419
Uncollateralized [Member]        
Financing Receivable, Impaired [Line Items]        
Total Recorded Investment     145,208 154,832
Related Allowance     15,517 17,218
Commercial [Member]        
Financing Receivable, Impaired [Line Items]        
Unpaid Contractual Principal Balance 6,013 6,013    
Recorded Investment With No Allowance 739 739    
Recorded Investment With Allowance 3,879 3,879    
Total Recorded Investment 4,618 4,618 25,310 40,083
Related Allowance 1,250 1,250 4,863 6,826
Average Recorded Investment 23,572 24,270    
Commercial [Member] | Collateral Pledged [Member]        
Financing Receivable, Impaired [Line Items]        
Recorded Investment With No Allowance     1,091 1,544
Recorded Investment With Allowance     2,496 3,471
Related Allowance     723 799
Commercial [Member] | Uncollateralized [Member]        
Financing Receivable, Impaired [Line Items]        
Total Recorded Investment     21,723 35,068
Related Allowance     4,140 6,027
Commercial [Member] | C&I [Member]        
Financing Receivable, Impaired [Line Items]        
Total Recorded Investment     24,425 30,644
Related Allowance     4,588 5,391
Commercial [Member] | C&I [Member] | Collateral Pledged [Member]        
Financing Receivable, Impaired [Line Items]        
Recorded Investment With No Allowance     1,091 1,544
Recorded Investment With Allowance     2,496 3,471
Related Allowance     723 799
Commercial [Member] | C&I [Member] | Uncollateralized [Member]        
Financing Receivable, Impaired [Line Items]        
Total Recorded Investment     20,838 25,629
Related Allowance     3,865 4,592
Commercial [Member] | Municipal [Member]        
Financing Receivable, Impaired [Line Items]        
Total Recorded Investment     885 9,439
Related Allowance     275 1,435
Commercial [Member] | Municipal [Member] | Uncollateralized [Member]        
Financing Receivable, Impaired [Line Items]        
Total Recorded Investment     885 9,439
Related Allowance     275 1,435
Agriculture [Member]        
Financing Receivable, Impaired [Line Items]        
Unpaid Contractual Principal Balance 1,287 1,287    
Recorded Investment With No Allowance 529 529    
Recorded Investment With Allowance 527 527    
Total Recorded Investment 1,056 1,056 6,250 6,648
Related Allowance 83 83 1,255 982
Average Recorded Investment 179 219    
Agriculture [Member] | Collateral Pledged [Member]        
Financing Receivable, Impaired [Line Items]        
Recorded Investment With No Allowance     328 470
Recorded Investment With Allowance     727 606
Related Allowance     171 96
Agriculture [Member] | Uncollateralized [Member]        
Financing Receivable, Impaired [Line Items]        
Total Recorded Investment     5,195 5,572
Related Allowance     1,084 886
Real Estate [Member]        
Financing Receivable, Impaired [Line Items]        
Unpaid Contractual Principal Balance 45,703 45,703    
Recorded Investment With No Allowance 20,370 20,370    
Recorded Investment With Allowance 12,800 12,800    
Total Recorded Investment 33,170 33,170 141,367 148,256
Related Allowance 1,711 1,711 11,061 12,821
Average Recorded Investment 17,107 17,586    
Real Estate [Member] | Collateral Pledged [Member]        
Financing Receivable, Impaired [Line Items]        
Recorded Investment With No Allowance     18,790 19,425
Recorded Investment With Allowance     5,982 16,602
Related Allowance     774 2,522
Real Estate [Member] | Uncollateralized [Member]        
Financing Receivable, Impaired [Line Items]        
Total Recorded Investment     116,595 112,229
Related Allowance     10,287 10,299
Real Estate [Member] | Construction & Development [Member]        
Financing Receivable, Impaired [Line Items]        
Total Recorded Investment     10,721 15,205
Related Allowance     1,099 652
Real Estate [Member] | Construction & Development [Member] | Collateral Pledged [Member]        
Financing Receivable, Impaired [Line Items]        
Recorded Investment With No Allowance     1,282 1,176
Recorded Investment With Allowance     238 2,661
Related Allowance     24 35
Real Estate [Member] | Construction & Development [Member] | Uncollateralized [Member]        
Financing Receivable, Impaired [Line Items]        
Total Recorded Investment     9,201 11,368
Related Allowance     1,075 617
Real Estate [Member] | Farm [Member]        
Financing Receivable, Impaired [Line Items]        
Total Recorded Investment     4,536 10,648
Related Allowance     9 1,312
Real Estate [Member] | Farm [Member] | Collateral Pledged [Member]        
Financing Receivable, Impaired [Line Items]        
Recorded Investment With No Allowance     1,697 2,614
Recorded Investment With Allowance     94 4,685
Related Allowance     0 654
Real Estate [Member] | Farm [Member] | Uncollateralized [Member]        
Financing Receivable, Impaired [Line Items]        
Total Recorded Investment     2,745 3,349
Related Allowance     9 658
Real Estate [Member] | Non-Owner Occupied CRE [Member]        
Financing Receivable, Impaired [Line Items]        
Total Recorded Investment     40,291 22,626
Related Allowance     4,200 1,921
Real Estate [Member] | Non-Owner Occupied CRE [Member] | Collateral Pledged [Member]        
Financing Receivable, Impaired [Line Items]        
Recorded Investment With No Allowance     6,444 4,009
Recorded Investment With Allowance     140 1,234
Related Allowance     15 500
Real Estate [Member] | Non-Owner Occupied CRE [Member] | Uncollateralized [Member]        
Financing Receivable, Impaired [Line Items]        
Total Recorded Investment     33,707 17,383
Related Allowance     4,185 1,421
Real Estate [Member] | Owner Occupied CRE [Member]        
Financing Receivable, Impaired [Line Items]        
Total Recorded Investment     51,808 62,730
Related Allowance     3,144 5,829
Real Estate [Member] | Owner Occupied CRE [Member] | Collateral Pledged [Member]        
Financing Receivable, Impaired [Line Items]        
Recorded Investment With No Allowance     5,605 7,279
Recorded Investment With Allowance     3,371 3,518
Related Allowance     544 657
Real Estate [Member] | Owner Occupied CRE [Member] | Uncollateralized [Member]        
Financing Receivable, Impaired [Line Items]        
Total Recorded Investment     42,832 51,933
Related Allowance     2,600 5,172
Real Estate [Member] | Residential [Member]        
Financing Receivable, Impaired [Line Items]        
Total Recorded Investment     34,011 37,047
Related Allowance     2,609 3,107
Real Estate [Member] | Residential [Member] | Collateral Pledged [Member]        
Financing Receivable, Impaired [Line Items]        
Recorded Investment With No Allowance     3,762 4,347
Recorded Investment With Allowance     2,139 4,504
Related Allowance     191 676
Real Estate [Member] | Residential [Member] | Uncollateralized [Member]        
Financing Receivable, Impaired [Line Items]        
Total Recorded Investment     28,110 28,196
Related Allowance     2,418 2,431
Consumer [Member]        
Financing Receivable, Impaired [Line Items]        
Unpaid Contractual Principal Balance 585 585    
Recorded Investment With Allowance 476 476    
Total Recorded Investment 476 476 2,067 2,464
Related Allowance 2 2 7 8
Average Recorded Investment $ 552 $ 606    
Consumer [Member] | Collateral Pledged [Member]        
Financing Receivable, Impaired [Line Items]        
Recorded Investment With Allowance     372 501
Related Allowance     1 2
Consumer [Member] | Uncollateralized [Member]        
Financing Receivable, Impaired [Line Items]        
Total Recorded Investment     1,695 1,963
Related Allowance     6 6
Consumer [Member] | Auto [Member]        
Financing Receivable, Impaired [Line Items]        
Total Recorded Investment     1,671 1,930
Related Allowance     5 6
Consumer [Member] | Auto [Member] | Collateral Pledged [Member]        
Financing Receivable, Impaired [Line Items]        
Recorded Investment With Allowance     329 407
Related Allowance     1 1
Consumer [Member] | Auto [Member] | Uncollateralized [Member]        
Financing Receivable, Impaired [Line Items]        
Total Recorded Investment     1,342 1,523
Related Allowance     4 5
Consumer [Member] | Non-Auto [Member]        
Financing Receivable, Impaired [Line Items]        
Total Recorded Investment     396 534
Related Allowance     2 2
Consumer [Member] | Non-Auto [Member] | Collateral Pledged [Member]        
Financing Receivable, Impaired [Line Items]        
Recorded Investment With Allowance     43 94
Related Allowance       1
Consumer [Member] | Non-Auto [Member] | Uncollateralized [Member]        
Financing Receivable, Impaired [Line Items]        
Total Recorded Investment     353 440
Related Allowance     $ 2 $ 1