Line of Credit - Additional Information (Detail)	Dec. 31, 2023 USD ($)
Debt Instrument [Line Items]
Maximum drawing capacity	$ 793,300,000
FHLB stock holdings	658,300
Advances outstanding	0
Federal reserve discount window capacity	26,300,000
Brokered certificate of deposit capacity	72,100,000
BancFirst [Member]
Debt Instrument [Line Items]
Advances outstanding	0
Worthington [Member]
Debt Instrument [Line Items]
Advances outstanding	0
Residential Mortgage [Member]
Debt Instrument [Line Items]
Line of credit assets pledged as collateral	1,100,000,000
Federal Home Loan Bank [Member]
Debt Instrument [Line Items]
Maximum drawing capacity	75,200,000
Revolving Line of Credit Member] | BancFirst [Member]
Debt Instrument [Line Items]
Maximum drawing capacity	25,000,000
Revolving Line of Credit Member] | Worthington [Member]
Debt Instrument [Line Items]
Maximum drawing capacity	$ 10,500,000