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Employee Benefits
6 Months Ended
Jun. 30, 2011
Compensation And Retirment Disclosure [Abstract]  
Employee Benefits
(6) Employee Benefits

BOK Financial has sponsored a defined benefit Pension Plan for all employees who satisfied certain age and service requirements.  Pension Plan benefits were curtailed as of April 1, 2006.  The Company recognized periodic pension expense of $1.2 million and $955 thousand for the three months ended June 30, 2011 and 2010, respectively and $1.9 million and $1.6 million for the six months ended June 30, 2011 and 2010, respectively.  The Company made no Pension Plan contributions during the six months ended June 30, 2011 and 2010.

Management has been advised that the maximum allowable contribution for 2011 is $28 million.  No minimum contribution is required for 2011.