Related Parties Related Parties (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Loans and Leases Receivable, Related Parties [Roll Forward]
Lease payments on office space in facilities owned by related party afffiliates	$ 23,500,000	$ 21,700,000	$ 20,600,000
Management [Member]
Loans and Leases Receivable, Related Parties [Roll Forward]
Beginning balance	49,943,000	99,340,000
Advances	292,393,000	644,715,000
Payments	(253,645,000)	(684,942,000)
Adjustments	0	(9,170,000)
Ending balance	88,691,000	49,943,000
Board of Directors Chairman [Member]
Loans and Leases Receivable, Related Parties [Roll Forward]
Lease payments on office space in facilities owned by related party afffiliates	952,000	1,100,000	1,100,000
Executive Officer [Member]
Loans and Leases Receivable, Related Parties [Roll Forward]
Loan commitment secured by tax-exempt bonds purchased from a trust of which the related party is chairman of the trust	25,000,000
Percentage of investment funds' assets held by clients	99.00%
Assets Held in Cavanal Hill Funds	$ 2,800,000,000.0