XML 52 R43.htm IDEA: XBRL DOCUMENT v3.22.1
Loans Held for Investment and Allowance for Credit Losses on Loans - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Financing Receivable Recorded Investment [Line Items]      
Paycheck protection program amortized processing fees recognized as interest income $ 1,700,000 $ 9,800,000  
Gains (losses) on sale of property held in other real estate owned 726,000 (55,000)  
Interest income that would have been recognized 376,000 $ 521,000  
U.S. Federal Agencies [Member]      
Financing Receivable Recorded Investment [Line Items]      
Nonaccrual loans guaranteed by government agencies 3,400,000   $ 3,300,000
Other Real Estate Owned [Member] | Commercial Real Estate      
Financing Receivable Recorded Investment [Line Items]      
Other real estate 29,500,000   $ 29,500,000
Previous Corporate Headquarters [Member] | Other Real Estate Owned [Member]      
Financing Receivable Recorded Investment [Line Items]      
Other real estate $ 2,400,000    
Parent Company [Member]      
Financing Receivable Recorded Investment [Line Items]      
Percentage of loans secured by real estate 64.00%    
BancFirst [Member]      
Financing Receivable Recorded Investment [Line Items]      
Loan percentage 84.00%    
Pegasus and Worthington [Member]      
Financing Receivable Recorded Investment [Line Items]      
Loan percentage 16.00%