Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash Flows From Operating Activities: [Abstract]
Net income	$ 295,479us-gaap_ProfitLoss	$ 318,931us-gaap_ProfitLoss	$ 354,124us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by (used in) operating activities: [Abstract]
Provision for credit losses	0	(27,900)	(22,000)
Change in fair value of mortgage servicing rights	16,445	(22,720)	9,210
Net unrealized losses (gains) from derivatives	(6,495)us-gaap_UnrealizedGainLossOnDerivatives	16,256us-gaap_UnrealizedGainLossOnDerivatives	(984)us-gaap_UnrealizedGainLossOnDerivatives
Tax effect from equity compensation, net	(8,258)	(2,210)	(120)
Change in bank-owned life insurance	(9,086)us-gaap_BankOwnedLifeInsuranceIncome	(10,155)us-gaap_BankOwnedLifeInsuranceIncome	(11,089)us-gaap_BankOwnedLifeInsuranceIncome
Share-based compensation	9,680us-gaap_ShareBasedCompensation	7,069us-gaap_ShareBasedCompensation	8,030us-gaap_ShareBasedCompensation
Depreciation and amortization	56,032	53,261	54,935
Net amortization of securities discounts and premiums	57,202	62,274	87,769
Net realized losses (gains) on financial instruments and other assets	(1,362)us-gaap_RealizedInvestmentGainsLosses	(12,586)us-gaap_RealizedInvestmentGainsLosses	(15,097)us-gaap_RealizedInvestmentGainsLosses
Net gain on mortgage loans held for sale	(62,053)bokf_Netgainonmortgageloansheldforsale	(84,403)bokf_Netgainonmortgageloansheldforsale	(120,599)bokf_Netgainonmortgageloansheldforsale
Mortgage loans originated for resale	(4,484,394)	(4,081,390)	(3,708,350)
Proceeds from sale of mortgage loans held for resale	4,441,819	4,254,151	3,731,830
Capitalized mortgage servicing rights	(54,413)bokf_Capitalizedmortgageservicingrights	(49,431)bokf_Capitalizedmortgageservicingrights	(42,191)bokf_Capitalizedmortgageservicingrights
Change in trading and fair value option securities	(243,265)	237,581	226,144
Change in receivables	(7,103)us-gaap_IncreaseDecreaseInReceivables	(3,122)us-gaap_IncreaseDecreaseInReceivables	9,244us-gaap_IncreaseDecreaseInReceivables
Change in other assets	77,907	76,257	10,999
Change in accrued interest, taxes and expense	(115,772)	18,192	23,424
Change in other liabilities	1,007	(13,735)	(3,729)
Net cash provided by (used in) operating activities	(36,630)	736,320	591,550
Cash Flows From Investing Activities: [Abstract]
Proceeds from maturities or redemptions of investment securities	63,258	143,445	111,511
Proceeds from maturities or redemptions of available for sale securities	1,635,533	2,650,045	4,456,363
Purchases of investment securities	(44,723)	(326,815)	(172,327)
Purchases of available for sale securities	(3,045,077)	(4,287,146)	(7,334,843)
Proceeds from sales of available for sale securities	2,664,740	2,436,093	1,744,662
Change in receivables on unsettled securities sales	(57,085)	193,878	(135,901)
Loans originated net of principal collected	(1,346,995)	(441,474)	(1,077,075)
Net proceeds from (payments on) derivative asset contracts	(247,726)	59,390	(13,273)
Acquisitions, net of cash acquired	(21,898)	(7,500)	(23,615)
Proceeds from disposition of assets	273,271	229,405	170,907
Purchases of assets	(307,318)	(212,292)	(94,756)
Net cash provided by (used in) investing activities	(434,020)	437,029	(2,368,347)
Cash Flows From Financing Activities: [Abstract]
Net change in demand deposits, transaction deposits and savings accounts	958,809	(637,734)	2,830,470
Net change in time deposits	(87,277)us-gaap_IncreaseDecreaseInTimeDeposits	(271,999)us-gaap_IncreaseDecreaseInTimeDeposits	(413,990)us-gaap_IncreaseDecreaseInTimeDeposits
Net change in other borrowings	511,776us-gaap_ProceedsFromRepaymentsOfDebt	(111,905)us-gaap_ProceedsFromRepaymentsOfDebt	210,607us-gaap_ProceedsFromRepaymentsOfDebt
Repayment of subordinated debentures	0	0	(53,705)
Net payments or proceeds on derivaive liability contracts	257,439	(64,724)	(7,560)
Net change in derivative margin accounts	84,365	51,646	39,237
Change in amount due on unsettled security purchases	244,800	(251,713)	(355,918)
Issuance of common and treasury stock, net	4,472	16,566	14,650
Sale of non-controlling interest	0	0	300
Tax effect from equity compensation, net	8,258	2,210	120
Repurchase of common stock	(12,337)	0	(20,558)
Dividends paid	(111,026)us-gaap_PaymentsOfDividendsCommonStock	(104,722)us-gaap_PaymentsOfDividendsCommonStock	(166,982)us-gaap_PaymentsOfDividendsCommonStock
Net cash provided by (used in) financing activities	1,859,279	(1,372,375)	2,076,671
Net increase (decrease) in cash and cash equivalents	1,388,629	(199,026)	299,874
Cash and cash equivalents at beginning of period	1,087,213	1,286,239	986,365
Cash and cash equivalents at end of period	2,475,842	1,087,213	1,286,239
Cash paid for interest	65,721us-gaap_InterestPaidNet	69,830us-gaap_InterestPaidNet	90,137us-gaap_InterestPaidNet
Cash paid for taxes	67,199us-gaap_IncomeTaxesPaidNet	132,176us-gaap_IncomeTaxesPaidNet	158,703us-gaap_IncomeTaxesPaidNet
Net loans transferred to real estate and other repossessed assets	79,464us-gaap_TransferToOtherRealEstate	86,868us-gaap_TransferToOtherRealEstate	133,502us-gaap_TransferToOtherRealEstate
Residential mortgage loans guaranteed by U.S. government agencies that became elgible fo repurchase during the year	144,630	127,572	121,432
Conveyance of other real estate owned guaranteed by U.S. government agencies	44,963	43,901	89,223
Issuance of shares in settlement of deferred compensation, net	$ 8,352	$ 0	$ 0

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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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Represents the non-cash issuance of common shares in settlement of deferred compensation, net of treasury shares received for payment of withholding taxes.

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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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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 increase (decrease) during the reporting period in the amounts payable to vendors for goods and services received and the amount of obligations and expenses incurred but not 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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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 investing activities, excluding those designated as hedging instruments.

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No definition available.

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The net cash outflow or inflow for the increase (decrease) in the beginning and end of period of loan and lease balances which are not originated or purchased specifically for resale. Includes cash payments and proceeds associated with (a) loans held-for-investment, (b) leases held-for-investment, and (c) both.

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-Section 45

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The cash outflow to reacquire common stock during the period.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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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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-Publisher FASB

-Name Accounting Standards Codification

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-Paragraph 13

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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

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-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562

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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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-Paragraph 12

-Subparagraph (a),(b)

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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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-Publisher FASB

-Name Accounting Standards Codification

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Amount of cash inflow from a noncontrolling interest. Includes, but is not limited to, purchase of additional shares or other increase in noncontrolling interest ownership.

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-URI http://asc.fasb.org/extlink&oid=6513228

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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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-Publisher FASB

-Name Accounting Standards Codification

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-Paragraph 9

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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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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

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- Definition

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

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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-Publisher FASB

-Name Accounting Standards Codification

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-Paragraph 12

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

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-Paragraph 25

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

+ References

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- Definition

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

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-Publisher FASB

-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591551-111686

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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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-Paragraph 11B

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-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524

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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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-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 3

-Subparagraph a

-Article 7

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- Definition

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.

+ References

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

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-Name Accounting Standards Codification

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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.

+ References

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