Subsequent Event	3 Months Ended
Mar. 31, 2019
Subsequent Events [Abstract]
Subsequent Event	(12) SUBSEQUENT EVENT On April 23, 2019 BancFirst Corporation entered into an agreement to acquire Pegasus Bank (“Pegasus”), for an aggregate cash purchase price of $122.0 million. Pegasus is a Texas chartered bank with three banking locations in Dallas, Texas. As of December 31, 2018, Pegasus had approximately $639.1 million in total assets, $367.4 million in loans and $595.3 million in deposits. The acquisition is expected to be completed during the third quarter of 2019 and is subject to regulatory approval. Upon acquisition, Pegasus will continue to operate as “Pegasus Bank” under a separate Texas charter and remain an independent subsidiary of BancFirst Corporation governed by its existing board of directors. BancFirst Corporation intends to provide an appropriate amount of capital or other support to increase Pegasus’ ability to approve larger loans and allow Pegasus to continue to grow their assets.

Subsequent Event

3 Months Ended

Mar. 31, 2019

(12) SUBSEQUENT EVENT

On April 23, 2019 BancFirst Corporation entered into an agreement to acquire Pegasus Bank (“Pegasus”), for an aggregate cash purchase price of $122.0 million. Pegasus is a Texas chartered bank with three banking locations in Dallas, Texas. As of December 31, 2018, Pegasus had approximately $639.1 million in total assets, $367.4 million in loans and $595.3 million in deposits. The acquisition is expected to be completed during the third quarter of 2019 and is subject to regulatory approval. Upon acquisition, Pegasus will continue to operate as “Pegasus Bank” under a separate Texas charter and remain an independent subsidiary of BancFirst Corporation governed by its existing board of directors. BancFirst Corporation intends to provide an appropriate amount of capital or other support to increase Pegasus’ ability to approve larger loans and allow Pegasus to continue to grow their assets.