Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash Flows From Operating Activities: [Abstract]
Net income	$ 75,094us-gaap_ProfitLoss	$ 77,043us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Provision for credit losses	0	0
Change in fair value of mortgage servicing rights	8,522	4,461
Unrealized losses (gains) from derivative contracts	641us-gaap_UnrealizedGainLossOnDerivatives	563us-gaap_UnrealizedGainLossOnDerivatives
Tax effect from equity compensation, net	(215)	(1,732)
Change in bank-owned life insurance	(2,198)us-gaap_BankOwnedLifeInsuranceIncome	(2,106)us-gaap_BankOwnedLifeInsuranceIncome
Share-based compensation	1,865us-gaap_ShareBasedCompensation	2,863us-gaap_ShareBasedCompensation
Depreciation and amortization	16,800	12,362
Net amortization of securities discounts and premiums	14,511	14,560
Net realized losses (gains) on financial instruments and other assets	(5,956)us-gaap_RealizedInvestmentGainsLosses	(1,202)us-gaap_RealizedInvestmentGainsLosses
Net gain on mortgage loans held for sale	(20,702)bokf_Netgainonmortgageloansheldforsale	(11,968)bokf_Netgainonmortgageloansheldforsale
Mortgage loans originated for sale	(1,565,016)	(727,516)
Proceeds from sale of mortgage loans held for sale	1,382,042	713,002
Capitalized mortgage servicing rights	(19,150)bokf_Capitalizedmortgageservicingrights	(8,644)bokf_Capitalizedmortgageservicingrights
Change in trading and fair value option securities	(52,479)	10,890
Change in receivables	(16,008)us-gaap_IncreaseDecreaseInReceivables	3,246us-gaap_IncreaseDecreaseInReceivables
Change in other assets	(6,293)	14,111
Change in accrued interest, taxes and expense	5,521	(41,114)
Change in other liabilities	8,173	1,555
Net cash provided by (used in) operating activities	(174,848)	60,374
Cash Flows From Investing Activities: [Abstract]
Proceeds from maturities or redemptions of investment securities	19,378	13,019
Proceeds from maturities or redemptions of available for sale securities	513,939	403,191
Purchases of investment securities	(3,363)	(5,834)
Purchases of available for sale securities	(980,768)	(679,171)
Proceeds from sales of available for sale securities	334,825	531,385
Change in amount receivable on unsettled securities transactions	64,661	(1,025)
Loans originated net of principal collected	(458,118)	(271,214)
Net payments on derivative asset contracts	(83,354)	40,220
Acquisitions, net of cash acquired	0	(12,624)
Proceeds from disposition of assets	66,111	20,071
Purchases of assets	(108,579)	(20,945)
Net cash provided by (used in) investing activities	(635,268)	17,073
Cash Flows From Financing Activities: [Abstract]
Net change in demand deposits, transaction deposits and savings accounts	(30,574)	154,205
Net change in time deposits	43,062us-gaap_IncreaseDecreaseInTimeDeposits	(33,819)us-gaap_IncreaseDecreaseInTimeDeposits
Net change in other borrowed funds	1,283,330us-gaap_ProceedsFromRepaymentsOfDebt	221,650us-gaap_ProceedsFromRepaymentsOfDebt
Net proceeds on derivative liability contracts	70,377	(40,228)
Net change in derivative margin accounts	(101,290)	(84,368)
Change in amount due on unsettled security transactions	(264,605)	(6,099)
Issuance of common and treasury stock, net	2,640	3,655
Tax effect from equity compensation, net	215	1,732
Repurchase of common stock	(29,484)	0
Dividends paid	(28,727)us-gaap_PaymentsOfDividendsCommonStock	(27,382)us-gaap_PaymentsOfDividendsCommonStock
Net cash provided by financing activities	944,944	189,346
Net increase in cash and cash equivalents	134,828	266,793
Cash and cash equivalents at beginning of period	2,475,842	1,087,213
Cash and cash equivalents at end of period	2,610,670	1,354,006
Supplemental Cash Flow Information [Abstract]
Cash paid for interest	15,380us-gaap_InterestPaidNet	14,394us-gaap_InterestPaidNet
Cash paid for taxes	3,232us-gaap_IncomeTaxesPaidNet	56us-gaap_IncomeTaxesPaidNet
Net loans and bank premises transferred to repossessed real estate and other assets	2,768us-gaap_TransferToOtherRealEstate	19,577us-gaap_TransferToOtherRealEstate
Residential mortgage loans guaranteed by U.S. government agencies that became eligible for repurchase during the period	29,409	31,441
Conveyance of other real estate owned guaranteed by U.S. government agencies	$ 66,912	$ 9,100

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Change in amount receivable on unsettled security transactions. This is an investing cash flow.

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Represents non-cash conveyance of other real estate owned guaranteed by U.S. government agencies during period.

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Represents the non-cash increase in loans related to the right but not the obligation to repurchases loans previously sold into Ginnie Mae pools based on certain criteria and as such has effectively regained control of the asset and must recognize the loan on the balance sheet.

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Net change in demand deposits, transaction deposits and savings accounts

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The net change in derivative margin accounts.

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Represents the combined realized net gain from sale of residential mortgage loans and the change in the unrealized net gain on mortgage loans held for sale during the period.

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The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method.

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Earnings on or other increases in the value of the cash surrender value of bank owned life insurance policies.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes.

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The aggregate net amount of depreciation, amortization, and accretion recognized during an accounting period. As a noncash item, the net amount is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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The increase (decrease) during the reporting period in other obligations or expenses incurred but not yet paid.

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The increase (decrease) during the reporting period in other assets used in operating activities not separately disclosed in the statement of cash flows. May include changes in other current assets, other noncurrent assets, or a combination of other current and noncurrent assets.

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The increase (decrease) during the reporting period in other liabilities used in operating activities not separately disclosed in the statement of cash flows. May include changes in other current liabilities, other noncurrent liabilities, or a combination of other current and noncurrent liabilities.

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The increase (decrease) during the reporting period in the total amount due within one year (or one operating cycle) from all parties, associated with underlying transactions that are classified as operating activities.

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Net cash inflow (outflow) of time deposits.

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Amount of increase (decrease) in the fair value of equity or debt securities classified as trading.

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The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.

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The adjustment to the carrying value of the rights retained or purchased to service mortgages. These adjustments are made when the estimate of the fair value is changed. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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The amount of cash paid for the origination of mortgages that are held for sale.

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The net cash outflow or inflow from derivative instruments during the period, which are classified as financing activities, excluding those designated as hedging instruments.

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The net cash outflow or inflow from derivative instruments during the period, which are classified as investing activities, excluding those designated as hedging instruments.

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The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity.

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Amount of cash outflow through purchase of long-term held-to-maturity securities.

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The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

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The cash inflow from the additional capital contribution to the entity.

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The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

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The cash inflow associated with the maturity, prepayments and calls (requests for early payments) of debt securities designated as held-to-maturity.

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The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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The net cash inflow or outflow in aggregate debt due to repayments and proceeds from additional borrowings.

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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The cash inflow from sales of loans that are secured with real estate mortgages and are held with the intention to resell in the near future.

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The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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Value transferred from mortgage loans to real estate owned (REO) in noncash transactions.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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