Fair Value Measurements, Measured On Recurring Basis Significant Unobservable Inputs (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]
Charitable contributions to BOKF Foundation	$ 2,420,000	$ 0
Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member] | Municipal and other tax-exempt securities [Member]
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]
Balance at beginning of period	17,805,000	40,702,000
Transfer to Level 3 from Level 2	0	0
Purchases and capital calls	0	0
Redemptions and distributions	(2,322,000)	(98,000)
Other comprehensive gain (loss)	118,000	(1,597,000)
Balance at end of period	15,523,000	39,007,000
Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member] | Municipal and other tax-exempt securities [Member] | Gain (loss) on assets [Member]
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]
Gain (loss) recognized in earnings	0	0
Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member] | Municipal and other tax-exempt securities [Member] | Gain on available for sale securities, net [Member]
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]
Gain (loss) recognized in earnings	(78,000)	0
Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member] | Municipal and other tax-exempt securities [Member] | Other-than-temporary impairment losses [Member]
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]
Gain (loss) recognized in earnings	0	0
Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member] | Municipal and other tax-exempt securities [Member] | Charitable Contributions to BOKF Foundation [Member]
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]
Gain (loss) recognized in earnings	0
Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member] | Other debt securities [Member]
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]
Balance at beginning of period	4,712,000	5,399,000
Transfer to Level 3 from Level 2	0	0
Purchases and capital calls	0	0
Redemptions and distributions	0	0
Other comprehensive gain (loss)	0	(206,000)
Balance at end of period	4,712,000	5,193,000
Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member] | Other debt securities [Member] | Gain (loss) on assets [Member]
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]
Gain (loss) recognized in earnings	0	0
Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member] | Other debt securities [Member] | Gain on available for sale securities, net [Member]
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]
Gain (loss) recognized in earnings	0	0
Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member] | Other debt securities [Member] | Other-than-temporary impairment losses [Member]
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]
Gain (loss) recognized in earnings	0	0
Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member] | Other debt securities [Member] | Charitable Contributions to BOKF Foundation [Member]
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]
Gain (loss) recognized in earnings	0
Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member] | Equity securities and mutual funds [Member]
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]
Balance at beginning of period	4,207,000	2,161,000
Transfer to Level 3 from Level 2	0	0
Purchases and capital calls	0	0
Redemptions and distributions	0	0
Other comprehensive gain (loss)	(1,787,000)	311,000
Balance at end of period	0	2,472,000
Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member] | Equity securities and mutual funds [Member] | Gain (loss) on assets [Member]
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]
Gain (loss) recognized in earnings	0	0
Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member] | Equity securities and mutual funds [Member] | Gain on available for sale securities, net [Member]
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]
Gain (loss) recognized in earnings	0	0
Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member] | Equity securities and mutual funds [Member] | Other-than-temporary impairment losses [Member]
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]
Gain (loss) recognized in earnings	0	0
Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member] | Equity securities and mutual funds [Member] | Charitable Contributions to BOKF Foundation [Member]
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]
Gain (loss) recognized in earnings	(2,420,000)
Fair Value, Inputs, Level 3 [Member] | Other Assets [Member] | Private equity funds [Member]
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]
Balance at beginning of period	27,341,000	28,169,000
Transfer to Level 3 from Level 2	0	0
Purchases and capital calls	205,000	492,000
Redemptions and distributions	(1,105,000)	(830,000)
Other comprehensive gain (loss)	0	0
Balance at end of period	27,466,000	29,216,000
Fair Value, Inputs, Level 3 [Member] | Other Assets [Member] | Private equity funds [Member] | Gain (loss) on assets [Member]
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]
Gain (loss) recognized in earnings	1,025,000	1,385,000
Fair Value, Inputs, Level 3 [Member] | Other Assets [Member] | Private equity funds [Member] | Gain on available for sale securities, net [Member]
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]
Gain (loss) recognized in earnings	0	0
Fair Value, Inputs, Level 3 [Member] | Other Assets [Member] | Private equity funds [Member] | Other-than-temporary impairment losses [Member]
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]
Gain (loss) recognized in earnings	0	0
Fair Value, Inputs, Level 3 [Member] | Other Assets [Member] | Private equity funds [Member] | Charitable Contributions to BOKF Foundation [Member]
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]
Gain (loss) recognized in earnings	$ 0