Acquisition (Notes)

6 Months Ended

Jun. 30, 2013

Acquisition [Abstract]

Mergers, Acquisitions and Dispositions Disclosures [Text Block]

Acquisition

On May 15, 2013, the Company and Summit Bancshares Inc. (Summit) signed a definitive merger agreement in which the Company will acquire all outstanding shares of Summit. Immediately after the merger, Summit's wholly-owned subsidiary, Summit Bank, will merge into the Bank. The Company's acquisition of Summit will add approximately $257 million in assets (including $214 million in loans), $226 million in deposits, and two branch locations in Tulsa and Oklahoma City. Under the terms of the agreement, if the transaction closes, it is anticipated that the Company will issue approximately 1,000,000 shares of Company common stock. It is anticipated that the transaction will be completed in the third quarter of 2013, pending customary closing conditions, including regulatory approvals and Summit shareholder approval.