Subsequent Event	12 Months Ended
Dec. 31, 2021
Subsequent Events [Abstract]
Subsequent Event	(24) SUBSEQUENT EVENT On January 10, 2022, the Company purchased United States Treasury Notes of $600 million par value with an average yield of 1.42% and an average maturity of 53 months. The effect of this purchase was included in the consolidated financial statements of the Company from the date of purchase forward. On February 8, 2022, BancFirst Corporation acquired Worthington National Bank (“Worthington”), for an aggregate cash purchase price of $77.7 million. Worthington is chartered and regulated by the Office of the Comptroller of the Currency (OCC), with one banking location in Arlington, Texas, one in Colleyville, Texas and two in Fort Worth, Texas. At acquisition, Worthington had approximately $470.3 million in total assets, $260.9 million in loans and $429.9 million in deposits. Worthington will continue to operate as “Worthington National Bank” and will remain a wholly-owned subsidiary of BancFirst Corporation. BancFirst Corporation intends to provide an appropriate amount of capital or other support to increase Worthington’s ability to approve larger loans and allow Worthington to continue to grow their assets. The initial accounting for the business combination is not complete due to limited time since the acquisition date. The acquisition did not have a material effect on the Company's consolidated financial statements.

Subsequent Event

12 Months Ended

Dec. 31, 2021

(24) SUBSEQUENT EVENT

On January 10, 2022, the Company purchased United States Treasury Notes of $600 million par value with an average yield of 1.42% and an average maturity of 53 months. The effect of this purchase was included in the consolidated financial statements of the Company from the date of purchase forward.

On February 8, 2022, BancFirst Corporation acquired Worthington National Bank (“Worthington”), for an aggregate cash purchase price of $77.7 million. Worthington is chartered and regulated by the Office of the Comptroller of the Currency (OCC), with one banking location in Arlington, Texas, one in Colleyville, Texas and two in Fort Worth, Texas. At acquisition, Worthington had approximately $470.3 million in total assets, $260.9 million in loans and $429.9 million in deposits. Worthington will continue to operate as “Worthington National Bank” and will remain a wholly-owned subsidiary of BancFirst Corporation. BancFirst Corporation intends to provide an appropriate amount of capital or other support to increase Worthington’s ability to approve larger loans and allow Worthington to continue to grow their assets. The initial accounting for the business combination is not complete due to limited time since the acquisition date. The acquisition did not have a material effect on the Company's consolidated financial statements.