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Loans Held for Investment and Allowance for Credit Losses on Loans - Summary of Amounts Included in Nonaccrual Loans Segregated by Portfolio Segment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans, Total $ 20,892 $ 37,545
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans, Total 2,900 1,404
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans, Total 407 4,719
Real Estate [Member] | Construction and Development Less than 60 Months [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans, Total 80 95
Real Estate [Member] | Residential Real Estate First Lien [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans, Total 2,763 3,615
Real Estate [Member] | Residential Real Estate All Other [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans, Total 280 1,362
Real Estate [Member] | Farmland [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans, Total 4,224 7,901
Commercial and Agricultural Non-Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans, Total 7,569 12,782
Consumer Non-real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans, Total 148 268
Oil and Gas [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans, Total 1,070  
Other Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans, Total $ 1,451 $ 5,399