XML 46 R40.htm IDEA: XBRL DOCUMENT v3.24.1.u1
Loans Held for Investment and Allowance for Credit Losses on Loans - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Financing Receivable Recorded Investment [Line Items]      
Gains (losses) on sale of property held in other real estate owned $ 177,000 $ 98,000  
Interest income recognized on nonaccrual loans 0 0  
Interest income that would have been recognized 696,000 $ 358,000  
Balance of modifies loans 1,100,000   $ 5,300,000
Commercial Real Estate      
Financing Receivable Recorded Investment [Line Items]      
Other real estate 30,400,000   29,400,000
U.S. Federal Agencies [Member]      
Financing Receivable Recorded Investment [Line Items]      
Nonaccrual loans guaranteed by government agencies $ 6,600,000   $ 6,700,000
Parent Company [Member]      
Financing Receivable Recorded Investment [Line Items]      
Percentage of loans secured by real estate 70.00%    
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%