BOK Financial (BOKF) 10-K 23 Feb 22 2021 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2021	Jan. 31, 2022	Jun. 30, 2021
Document and Entity Information [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2021
Document Transition Report	false
Entity File Number	001-37811
Entity Registrant Name	BOK FINANCIAL CORP
Entity Incorporation, State or Country Code	OK
Entity Tax Identification Number	73-1373454
Entity Address, Address Line One	Boston Avenue at Second Street
Entity Address, City or Town	Tulsa,
Entity Address, State or Province	OK
Entity Address, Postal Zip Code	74172
City Area Code	918
Local Phone Number	588-6000
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
ICFR Auditor Attestation Flag	true
Entity Common Stock, Shares Outstanding		68,322,916
Entity Central Index Key	0000875357
Current Fiscal Year End Date	--12-31
Entity Public Float			$ 2,600,000,000
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Amendment Flag	false
Auditor Firm ID	42
Auditor Name	Ernst & Young LLP
Auditor Location	Tulsa, Oklahoma

Consolidated Statements of Earn

Consolidated Statements of Earnings - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Interest and dividend revenue [Abstract]
Loans	$ 769,357	$ 889,507	$ 1,123,791
Residential mortgage loans held for sale	5,465	6,397	7,105
Trading securities	155,989	67,689	61,595
Investment securities	10,430	11,943	13,426
Available for sale securities	230,383	261,196	254,031
Fair value option securities	1,542	18,475	32,936
Restricted equity securities	5,703	10,963	26,860
Interest-bearing cash and cash equivalents	1,060	2,830	12,214
Total interest revenue	1,179,929	1,269,000	1,531,958
Interest Expense [Abstract]
Deposits	33,484	89,996	175,538
Borrowed funds	17,877	56,616	228,428
Subordinated debentures	10,535	13,944	15,113
Total interest expense	61,896	160,556	419,079
Net interest and dividend revenue	1,118,033	1,108,444	1,112,879
Provision for credit losses	(100,000)	222,592	44,000
Net interest and dividend revenue after provision for credit losses	1,218,033	885,852	1,068,879
Total fees and commissions	668,309	810,320	702,201
Other gains, net	63,742	6,046	10,214
Gain (loss) on derivatives, net	(19,378)	42,320	14,951
Gain (loss) on fair value option securities, net	(2,239)	53,248	15,787
Change in fair value of mortgage servicing rights	41,637	(79,524)	(53,517)
Gain on available for sale securities, net	3,704	9,910	5,597
Total other operating revenue	755,775	842,320	695,233
Other operating expense [Abstract]
Personnel	695,382	688,474	660,565
Business promotion	16,289	14,511	35,662
Charitable contributions to BOKF Foundation	9,000	9,000	3,000
Professional fees and services	50,906	53,437	54,861
Net occupancy and equipment	108,587	112,722	110,275
Insurance	15,881	19,990	20,906
Data processing and communications	151,614	135,497	124,983
Printing, postage and supplies	14,218	15,061	16,517
Amortization of intangible assets	18,311	20,443	20,618
Mortgage banking costs	42,698	56,711	50,685
Other expense	54,822	38,462	35,172
Total other operating expense	1,177,708	1,164,308	1,133,244
Net income before taxes	796,100	563,864	630,868
Federal and state income taxes	179,775	128,793	130,183
Net income	616,325	435,071	500,685
Net income (loss) attributable to Non-controlling interests	(1,796)	41	(73)
Net income attributable to BOK Financial Corporation shareholders	$ 618,121	$ 435,030	$ 500,758
Earnings per share: [Abstract]
Basic (in dollars per share)	$ 8.95	$ 6.19	$ 7.03
Diluted (in dollars per share)	$ 8.95	$ 6.19	$ 7.03
Average shares used in computation: [Abstract]
Basic (in shares)	68,591,920	69,840,977	70,787,700
Diluted (in shares)	68,594,322	69,844,172	70,802,612
Dividends declared per share (in dollars per share)	$ 2.09	$ 2.05	$ 2.01
Brokerage and trading revenue [Member]
Total fees and commissions	$ 112,989	$ 221,833	$ 159,826
Transaction card revenue [Member]
Total fees and commissions	96,983	90,182	87,216
Fiduciary and asset management revenue [Member]
Total fees and commissions	178,274	167,445	177,025
Deposit service charges and fees [Member]
Total fees and commissions	104,217	96,805	112,485
Mortgage banking revenue [Member]
Total fees and commissions	105,896	182,360	107,541
Other revenue [Member]
Total fees and commissions	$ 69,950	$ 51,695	$ 58,108

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 616,325	$ 435,071	$ 500,685
Other comprehensive income (loss), before income taxes: [Abstract]
Net change in unrealized gain (loss)	(341,369)	313,796	241,047
Reclassification adjustments included in earnings: [Abstract]
Gain on available for sale securities, net	(3,704)	(9,910)	(5,597)
Other comprehensive gain (loss), before income taxes	(345,073)	303,886	235,450
Federal and state income taxes	(81,576)	72,941	57,942
Other comprehensive gain (loss), net of income taxes	(263,497)	230,945	177,508
Comprehensive income	352,828	666,016	678,193
Comprehensive income (loss) attributable to non-controlling interests	(1,796)	41	(73)
Comprehensive income attributable to BOK Financial Corp. shareholders	$ 354,624	$ 665,975	$ 678,266

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Assets [Abstract]
Cash and due from banks	$ 712,067	$ 798,757
Interest-bearing cash and cash equivalents	2,125,343	381,816
Trading securities	9,136,813	4,707,975
Investment securities	210,444	244,843
Available for sale securities	13,157,817	13,050,665
Fair value option securities	43,770	114,982
Restricted equity securities	83,113	171,391
Residential mortgage loans held for sale	192,295	252,316
Loans	20,205,680	23,007,520
Allowance for loan losses	(256,421)	(388,640)
Loans, net of allowance	19,949,259	22,618,880
Premises and equipment, net	574,148	551,308
Receivables	223,021	245,880
Goodwill	1,044,749	1,048,091
Intangible assets, net	91,778	113,436
Mortgage servicing rights	163,198	101,172
Real estate and other repossessed assets, net of allowance	24,589	90,526
Derivative contracts, net	1,097,297	810,688
Cash surrender value of bank-owned life insurance	405,607	398,758
Receivable on unsettled securities sales	56,172	62,386
Other assets	957,951	907,218
Total assets	50,249,431	46,671,088
Deposits [Abstract]
Noninterest-bearing demand deposits	15,344,423	12,266,338
Interest-bearing Deposit Liabilities [Abstract]
Transaction	23,268,573	21,158,422
Savings	924,735	751,992
Time	1,704,328	1,967,128
Total deposits	41,242,059	36,143,880
Funds purchased and repurchase agreements	2,326,449	1,662,386
Other borrowings	36,753	1,882,970
Subordinated debentures	131,226	276,005
Accrued interest, taxes and expense	273,041	323,667
Derivative contracts, net	275,625	405,779
Due on unsettled securities purchases	160,686	257,627
Other liabilities	435,221	427,213
Total liabilities	44,881,060	41,379,527
Shareholders' equity: [Abstract]
Common stock	5	5
Capital surplus	1,378,794	1,368,062
Retained earnings	4,447,691	3,973,675
Treasury stock	(535,129)	(411,344)
Accumulated other comprehensive income (loss)	72,371	335,868
Total shareholders’ equity	5,363,732	5,266,266
Non-controlling interests	4,639	25,295
Total equity	5,368,371	5,291,561
Total liabilities and equity	$ 50,249,431	$ 46,671,088

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Investment securities [Abstract]
Investment securities, fair value	$ 231,395	$ 272,431
Real estate and other repossessed assets, allowance	$ 6,083	$ 15,060
Shareholders' equity: [Abstract]
Common stock, par value (in dollars per share)	$ 0.00006	$ 0.00006
Common stock, shares authorized (in shares)	2,500,000,000	2,500,000,000
Common stock, shares issued (in shares)	76,254,029	75,995,205
Common stock, shares outstanding (in shares)	76,254,029	75,995,205
Treasury stock, shares at cost (in shares)	7,786,257	6,357,605

Consolidated Statements of Chan

Consolidated Statements of Changes in Equity - USD ($) shares in Thousands, $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjusted Balance	Common Stock [Member]	Common Stock [Member]Cumulative Effect, Period of Adoption, Adjusted Balance	Capital Surplus [Member]	Capital Surplus [Member]Cumulative Effect, Period of Adoption, Adjusted Balance	Retained Earnings [Member]	Retained Earnings [Member]Cumulative Effect, Period of Adoption, Adjustment	Retained Earnings [Member]Cumulative Effect, Period of Adoption, Adjusted Balance	Treasury Stock [Member]	Treasury Stock [Member]Cumulative Effect, Period of Adoption, Adjusted Balance	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Other Comprehensive Income (Loss) [Member]Cumulative Effect, Period of Adoption, Adjusted Balance	Total Shareholders' Equity [Member]	Total Shareholders' Equity [Member]Cumulative Effect, Period of Adoption, Adjustment	Total Shareholders' Equity [Member]Cumulative Effect, Period of Adoption, Adjusted Balance	Non-Controlling Interests [Member]	Non-Controlling Interests [Member]Cumulative Effect, Period of Adoption, Adjusted Balance
Balance, beginning of period (in shares) at Dec. 31, 2018				75,711	75,711						3,589	3,589
Balance, beginning of period at Dec. 31, 2018	$ 4,443,045		$ 4,445,907	$ 5	$ 5	$ 1,334,030	$ 1,334,030	$ 3,369,654		$ 3,372,516	$ (198,995)	$ (198,995)	$ (72,585)	$ (72,585)	$ 4,432,109		$ 4,434,971	$ 10,936	$ 10,936
Balance, beginning of period (Accounting Standards Update 2016-02) at Dec. 31, 2018		$ 2,862							$ 2,862							$ 2,862
Net income	500,685							500,758							500,758			(73)
Other comprehensive income (loss), net	177,508												177,508		177,508
Repurchase of common stock (in shares)											1,572
Repurchase of common stock	(129,483)										$ (129,483)				(129,483)
Stock options exercised (in shares)				27
Stock options exercised	1,421					1,421									1,421
Non-vested shares awarded, net (in shares)				21
Vesting of non-vested shares (in shares)											18
Vesting of non-vested shares	(1,428)										$ (1,428)				(1,428)
Share-based compensation	15,544					15,544									15,544
Cash dividends on common stock	(143,496)							(143,496)							(143,496)
Capital calls and distributions, net	2,739																	2,739
Balance, end of period (in shares) at Dec. 31, 2019				75,759	75,759						5,179	5,179
Balance, end of period at Dec. 31, 2019	4,863,919		4,817,223	$ 5	$ 5	1,350,995	1,350,995	3,729,778		3,683,082	$ (329,906)	$ (329,906)	104,923	104,923	4,855,795		4,809,099	8,124	8,124
Balance, end of period (Accounting Standards Update 2016-13) at Dec. 31, 2019		$ (46,696)							$ (46,696)							$ (46,696)
Net income	435,071							435,030							435,030			41
Other comprehensive income (loss), net	230,945												230,945		230,945
Repurchase of common stock (in shares)											1,107
Repurchase of common stock	(75,830)										$ (75,830)				(75,830)
Stock options exercised (in shares)				12
Stock options exercised	675					675									675
Non-vested shares awarded, net (in shares)				224
Vesting of non-vested shares (in shares)											72
Vesting of non-vested shares	(5,608)										$ (5,608)				(5,608)
Share-based compensation	16,392					16,392									16,392
Cash dividends on common stock	(144,437)							(144,437)							(144,437)
Capital calls and distributions, net	17,130																	17,130
Balance, end of period (in shares) at Dec. 31, 2020				75,995	75,995						6,358	6,358
Balance, end of period at Dec. 31, 2020	5,291,561		$ 5,291,561	$ 5	$ 5	1,368,062	$ 1,368,062	3,973,675		$ 3,973,675	$ (411,344)	$ (411,344)	335,868	$ 335,868	5,266,266		$ 5,266,266	25,295	$ 25,295
Net income	616,325							618,121							618,121			(1,796)
Other comprehensive income (loss), net	(263,497)												(263,497)		(263,497)
Repurchase of common stock (in shares)											1,360
Repurchase of common stock	(117,938)										$ (117,938)				(117,938)
Stock options exercised (in shares)				17
Stock options exercised	973					973									973
Non-vested shares awarded, net (in shares)				242
Vesting of non-vested shares (in shares)											68
Vesting of non-vested shares	(5,847)										$ (5,847)				(5,847)
Share-based compensation	9,759					9,759									9,759
Cash dividends on common stock	(144,105)							(144,105)							(144,105)
Capital calls and distributions, net	18,860																	18,860
Balance, end of period (in shares) at Dec. 31, 2021				76,254							7,786
Balance, end of period at Dec. 31, 2021	$ 5,368,371			$ 5		$ 1,378,794		$ 4,447,691			$ (535,129)		$ 72,371		$ 5,363,732			$ 4,639

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash Flows From Operating Activities: [Abstract]
Net income	$ 616,325	$ 435,071	$ 500,685
Adjustments to reconcile net income to net cash provided by (used in) operating activities: [Abstract]
Provision for credit losses	(100,000)	222,592	44,000
Change in fair value of mortgage servicing rights due to market changes	(41,637)	79,524	53,517
Change in fair value of mortgage servicing rights due to principal payments	38,761	41,598	38,979
Net unrealized losses (gains) from derivative contracts	30,201	(59,253)	(25,936)
Share-based compensation	9,759	16,392	15,544
Depreciation and amortization	102,468	99,013	95,416
Net amortization of discounts and premiums	18,293	5,357	(16,984)
Net losses (gains) on financial instruments and other losses (gains), net	(67,446)	(15,949)	(583)
Net gain on mortgage loans held for sale	(70,464)	(114,545)	(40,402)
Mortgage loans originated for sale	(2,818,789)	(3,764,112)	(3,025,930)
Proceeds from sale of mortgage loans held for sale	2,939,522	3,817,475	3,035,600
Capitalized mortgage servicing rights	(31,132)	(31,209)	(35,128)
Change in trading and fair value option securities	(4,357,950)	(2,103,931)	(483,007)
Change in receivables	39,183	945,087	(740,868)
Change in other assets	(12,568)	1,739	18,955
Change in other liabilities	12,897	8,895	92,463
Net cash provided by (used in) operating activities	(3,692,577)	(416,256)	(473,679)
Cash Flows From Investing Activities: [Abstract]
Proceeds from maturities or redemptions of investment securities	33,865	46,992	60,128
Proceeds from maturities or redemptions of available for sale securities	3,500,081	2,695,067	1,841,069
Purchases of available for sale securities	(4,607,199)	(4,575,324)	(5,245,256)
Proceeds from sales of available for sale securities	622,881	384,507	1,211,718
Change in amount receivable on unsettled available for sale securities transactions	(10,406)	(6,357)	25,410
Loans originated, net of principal collected	2,853,326	(1,103,752)	(44,414)
Net payments or proceeds on derivative asset contracts	161,093	(121,130)	33,566
Net change in restricted equity securities	88,278	289,161	116,105
Proceeds from disposition of assets	165,040	73,135	62,576
Purchases of assets	(204,287)	(141,134)	(384,639)
Net cash provided by (used in) investing activities	2,602,672	(2,458,835)	(2,323,737)
Cash Flows From Financing Activities: [Abstract]
Net change in demand deposits, transaction deposits and savings accounts	5,360,979	8,773,433	2,252,936
Net change in time deposits	(262,800)	(250,721)	104,288
Net change in other borrowed funds	(1,269,241)	(5,091,026)	1,110,970
Repayment of subordinated debentures	(150,000)	0	0
Change in amount due on unsettled security purchases	(117,452)	63,521	(41,651)
Issuance of common and treasury stock, net	(4,874)	(4,933)	(7)
Net change in derivative margin accounts	(467,865)	(600,218)	(207,122)
Net payments or proceeds on derivative liability contracts	(79,962)	127,054	(33,622)
Repurchase of common stock	(117,938)	(75,830)	(129,483)
Dividends paid	(144,105)	(144,437)	(143,496)
Net cash provided by (used in) financing activities	2,746,742	2,796,843	2,912,813
Net increase (decrease) in cash and cash equivalents	1,656,837	(78,248)	115,397
Cash and cash equivalents at beginning of period	1,180,573	1,258,821	1,143,424
Cash and cash equivalents at end of period	2,837,410	1,180,573	1,258,821
Supplemental Cash Flow Information: [Abstract]
Cash paid for interest	68,775	160,288	417,070
Cash paid for taxes	135,331	136,181	87,361
Net loans and bank premises transferred to repossessed real estate and other assets	8,320	85,323	10,665
Increase in U.S. government guaranteed loans eligible for repurchase	87,087	290,977	91,634
Increase in receivables from conveyance of GNMA OREO	6,376	11,322	28,669
Right-of-use assets obtained in exchange for operating lease liabilities	$ 40,798	$ 16,177	$ 62,755

Mortgage Banking Activities Mor

Mortgage Banking Activities Mortgage Banking Activities	12 Months Ended
	Dec. 31, 2021
Mortgage Banking [Abstract]
Mortgage Banking Activities [Text Block]	Mortgage Banking Activities Residential Mortgage Loan Production The Company originates, markets and services conventional and government-sponsored residential mortgage loans. Generally, conforming fixed rate residential mortgage loans are held for sale in the secondary market and non-conforming and adjustable-rate residential mortgage loans are held for investment. The volume of mortgage loans originated for sale and secondary market prices are the primary drivers of originating and marketing revenue. Residential mortgage loan commitments are generally outstanding for 60 to 90 days, which represents the typical period from commitment to originate a residential mortgage loan to when the closed loan is sold to an investor. Residential mortgage loan commitments are subject to both credit and interest rate risk. Credit risk is managed through underwriting policies and procedures, including collateral requirements, which are generally accepted by the secondary loan markets. Exposure to interest rate fluctuations is partially managed through forward sales of residential mortgage-backed securities and forward sales contracts. These latter contracts set the price for loans that will be delivered in the next 60 to 90 days. The unpaid principal balance of residential mortgage loans held for sale, notional amounts of derivative contracts related to residential mortgage loan commitments and forward contract sales and their related fair values included in Mortgage loans held for sale on the Consolidated Balance Sheets were (in thousands): December 31, 2021 December 31, 2020 Unpaid Principal Balance/ Fair Value Unpaid Principal Balance/ Fair Value Residential mortgage loans held for sale $ 182,710 $ 186,175 $ 227,161 $ 236,444 Residential mortgage loan commitments 171,412 6,167 380,637 20,435 Forward sales contracts 328,433 (47) 549,414 (4,563) $ 192,295 $ 252,316 No residential mortgage loans held for sale were 90 days or more past due or considered impaired as of December 31, 2021 or December 31, 2020. No credit losses were recognized on residential mortgage loans held for sale for the years ended December 31, 2021, 2020 and 2019. Mortgage banking revenue was as follows (in thousands): Year Ended 2021 2020 2019 Production revenue: Net realized gains on sales of mortgage loans $ 76,282 $ 107,847 $ 39,730 Net change in unrealized gain on mortgage loans held for sale (5,818) 6,697 672 Net change in the fair value of mortgage loan commitments (14,268) 15,202 (145) Net change in the fair value of forward sales contracts 4,516 (3,898) 2,463 Total mortgage production revenue 60,712 125,848 42,720 Servicing revenue 45,184 56,512 64,821 Total mortgage banking revenue $ 105,896 $ 182,360 $ 107,541 Mortgage production revenue includes gain (loss) on residential mortgage loans held for sale and changes in the fair value of derivative contracts not designated as hedging instruments related to residential mortgage loan commitments and forward sales contracts. Servicing revenue includes servicing fee income and late charges on loans serviced for others. Residential Mortgage Servicing The Company generally retains the right to service residential mortgage loans sold and may purchase mortgage servicing rights. The unpaid principal balance of loans serviced for others is the primary driver of servicing revenue. The following represents a summary of mortgage servicing rights (Dollars in thousands): December 31, 2021 2020 2019 Number of residential mortgage loans serviced for others 102,008 106,201 126,828 Outstanding principal balance of residential mortgage loans serviced for others $ 16,442,446 $ 16,228,449 $ 20,727,106 Weighted average interest rate 3.58 % 3.84 % 3.98 % Remaining contractual term (in months) 281 280 289 Activity in capitalized mortgage servicing rights during the three years ended December 31, 2021 is as follows (in thousands): Balance, December 31, 2018 $ 259,254 Additions 35,128 Change in fair value due to loan runoff (38,979) Change in fair value due to market changes (53,517) Balance, December 31, 2019 201,886 Additions 31,209 Disposals (10,801) Change in fair value due to loan runoff (41,598) Change in fair value due to market changes (79,524) Balance, December 31, 2020 101,172 Additions 31,132 Acquisitions 28,018 Change in fair value due to loan runoff (38,761) Change in fair value due to market changes 41,637 Balance, December 31, 2021 $ 163,198 Changes in the fair value of mortgage servicing rights due to market changes are included in Other operating revenue in the Consolidated Statements of Earnings. Changes in fair value due to loan runoff are included in Mortgage banking costs. Mortgage servicing rights are not traded in active markets. Fair value is determined by discounting the projected net cash flows. Significant assumptions used to determine fair value considered to be significant unobservable inputs were as follows: December 31, 2021 2020 Discount rate – risk-free rate plus a market premium 8.39% 9.14% Prepayment rate - based upon loan interest rate, original term and loan type 12.11% 19.73% Loan servicing costs – annually per loan based upon loan type: Performing loans $69 - $94 $69 - $94 Delinquent loans $150 - $500 $150 - $500 Loans in foreclosure $1,000 - $4,000 $1,000 - $4,000 Primary/secondary mortgage rate spread 105 bps 105 bps Escrow earnings rate – indexed to rates paid on deposit accounts with comparable average life 1.32% 0.43% Delinquency rate 2.05% 3.54%

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2021
Accounting Policies [Abstract]
Significant Accounting Policies [Text Block]	Significant Accounting Policies Basis of Presentation The Consolidated Financial Statements of BOK Financial Corporation (“BOK Financial” or “the Company”) have been prepared in conformity with accounting principles generally accepted in the United States ("U.S. GAAP"), including interpretations of U.S. GAAP issued by federal banking regulators and general practices of the banking industry. The Consolidated Financial Statements include the accounts of BOK Financial and its subsidiaries, principally BOKF, NA, BOK Financial Securities, Inc., BOK Financial Private Wealth, Inc., BOK Financial Insurance, Inc. and Cavanal Hill Distributors, Inc. All significant intercompany transactions are eliminated in consolidation. The Consolidated Financial Statements include the assets, liabilities, non-controlling interests and results of operations of variable interest entities (“VIEs”) when BOK Financial is determined to be the primary beneficiary. Variable interest entities are generally defined as entities that either do not have sufficient equity to finance their activities without support from other parties or whose equity investors lack a controlling financial interest. Determination that the Company is the primary beneficiary considers the power to direct the activities that most significantly impact the variable interest's economic performance and the obligation to absorb losses of the variable interest or the right to receive benefits of the variable interest that could be significant to the variable interest. Certain prior year amounts have been reclassified to conform to current year presentation. Nature of Operations BOK Financial, through its subsidiaries, provides a wide range of financial services to commercial and industrial customers, other financial institutions, municipalities, and consumers. These services include depository and cash management; lending and lease financing; mortgage banking; securities brokerage, trading and underwriting; and personal and corporate trust. BOKF, NA operates as Bank of Oklahoma primarily in the Tulsa and Oklahoma City metropolitan areas of the state of Oklahoma and Bank of Texas primarily in the Dallas, Fort Worth and Houston metropolitan areas of the state of Texas. In addition, BOKF, NA does business as BOK Financial in the metropolitan areas of Phoenix, Arizona; Northwest Arkansas; Denver, Colorado; Kansas City, Missouri/Kansas; and as Bank of Albuquerque in Albuquerque, New Mexico. BOKF, NA also operates the TransFund electronic funds network, Cavanal Hill Investment Management, and BOK Financial Asset Management, Inc. Use of Estimates Preparation of BOK Financial's Consolidated Financial Statements requires management to make estimates of future economic activities, including loan collectability, loss contingencies, prepayments and cash flows from customer accounts. These estimates are based upon current conditions and information available to management. Actual results may differ significantly from these estimates. Acquisitions Assets and liabilities acquired, including identifiable intangible assets, are recorded at fair value on the acquisition date. The purchase price includes consideration paid at closing and the estimated fair value of contingent consideration that will be paid in the future, subject to achieving defined performance criteria. Premiums and discounts assigned to interest-earning assets and interest-bearing liabilities are amortized over the lives of the acquired assets and liabilities on either an individual instrument or pool basis. Goodwill is recognized as the excess of the purchase price over the net fair value of assets acquired and liabilities assumed. Acquired loans with more than an insignificant credit deterioration since inception are recorded at fair value plus a gross-up amount which is offset by an allowance for credit losses. Acquired loans without a more than insignificant credit deterioration since inception are recorded at fair value. An allowance for credit losses is recognized through a provision for credit losses, similar to origination loans. The Consolidated Statements of Earnings include the results of operations from the acquisition date. Goodwill and Intangible Assets Goodwill for each reporting unit is evaluated for impairment annually as of October 1st or more frequently if conditions indicate that impairment may have occurred. The evaluation of possible goodwill impairment involves significant judgment based upon short-term and long-term projections of future performance. Reporting units are defined by the Company as significant lines of business within each operating segment. This definition is consistent with the manner in which the chief operating decision maker assesses the performance of the Company and makes decisions concerning the allocation of resources. During the evaluation for impairment, management qualitatively assesses whether it is more likely than not that the fair value of the reporting units is less than their carrying value. Reporting unit carrying value includes sufficient capital to exceed regulatory requirements plus goodwill. This assessment includes consideration of relevant events and circumstances including, but not limited to, macroeconomic conditions, industry and market conditions, the financial and stock performance of the Company and other relevant factors. Specifically, the analysis may include: • General economic conditions including overall economic activity, consumer spending and mobility, unemployment rates, consumer confidence, and duration and severity of any current market moving instability. • Global health concerns including ongoing pandemics or potential for widespread health issues, the future course of a pandemic and the potential for medical advances. • Regional economic conditions including demand for oil and price stability of oil, other overarching conditions that may be affecting any of the Company's primary states such as weather or other catastrophes, pandemics and health related lockdowns, or other state mandates. • Industry conditions including federal funds rate movement by the Federal Reserve, the interest rate environment and the resulting effect on net interest revenue and operating revenue, and regulatory mandates that hinder or provide relief to the financial services industry. • Company specific conditions including current and forecasted income, changes in stock price, the Company's stock price compared to peers and other indexes, book value per share compared to fair value per share, goodwill compared to total shareholders' equity, current capital and liquidity position, demand for products and services, health of the loan portfolio and other credit related factors, and current credit ratings with the ratings agencies, and regulatory ratings. • Reporting unit performance and forecasts including any event that may significantly impact a reporting unit. If management concludes based on the qualitative assessment that goodwill may be impaired, a quantitative impairment test will be applied to goodwill at all reporting units. The quantitative analysis compares the fair value of the reporting unit with its carrying value. The fair value of each reporting unit is estimated by the discounted future earnings method. Goodwill is considered impaired if the fair value of the reporting unit is less than the carrying value of the reporting unit, including goodwill. Both the qualitative assessment and quantitative analysis require significant management judgment, including estimates of changes in future economic conditions and their underlying causes and duration, the reasonableness and effectiveness of management's responses to those changes, changes in governmental fiscal and monetary policies, and fair value measurements based largely on significant unobservable inputs. The results of these judgments may have a significant impact on the Company's reported results of operations. See Note 6, "Goodwill and Intangible Assets" for breakout of goodwill by reporting unit. Intangible assets are generally composed of customer relationships, naming rights, non-compete agreements and core deposit premiums. They are amortized using accelerated or straight-line methods, as appropriate, over the estimated benefit periods. These periods range from 3 years to 20 years. The net book values of identifiable intangible assets are evaluated for impairment when economic conditions indicate impairment may exist. Cash Equivalents Due from banks, funds sold (generally federal funds sold for one day), resell agreements (which generally mature within one day to 30 days) and investments in money market funds are considered cash equivalents. Securities Securities are identified as trading, investment (held to maturity) or available for sale at the time of purchase based upon the intent of management, liquidity and capital requirements, regulatory limitations and other relevant factors. Trading securities, which are acquired for profit through resale, are carried at fair value with unrealized gains and losses included in current period earnings. Investment securities are carried at amortized cost. Amortization is computed by methods that approximate level yield and is adjusted for changes in prepayment estimates. Securities identified as available for sale are carried at fair value. Unrealized gains and losses are recorded, net of deferred income taxes, as accumulated other comprehensive income in shareholders' equity. Available for sale securities are separately identified as pledged to creditors if the creditor has the right to sell or re-pledge the collateral. The purchase or sale of securities is recognized on a trade date basis. Realized gains and losses on sales of securities are based upon specific identification of the security sold. A receivable or payable is recognized for subsequent transaction settlement. On a quarterly basis, the Company performs separate evaluations of debt investment and available for sale securities for the presence of impairment. We assess whether impairment is present on an individual security basis when the fair value of a debt security is less than the amortized cost. Management determines whether it intends to sell or if it is more likely than not that it will be required to sell impaired securities. This determination considers current and forecasted liquidity requirements and securities portfolio management. If the Company intends to sell or it is more likely than not that it will be required to sell the impaired debt security, a charge is recognized against earnings for the entire unrealized loss. For all impaired debt securities for which there is no intent or expected requirement to sell, the evaluation considers all available evidence to assess whether it is more likely than not that all amounts due would not be collected according to the security's contractual terms and whether there is any impairment attributable to credit-related factors. If an impairment exists, the amount attributed to credit-related factors is measured and an allowance for credit loss is recognized. Declines in fair value that are not recorded in the allowance are recorded in other comprehensive income, net of taxes. BOK Financial may elect to carry certain securities that are not held for trading purposes at fair value with changes in fair value recognized in current period income. These securities are held with the intent that gains or losses will offset changes in the fair value of mortgage servicing rights or other financial instruments. Restricted equity securities represent equity interests the Company is required to hold in the Federal Reserve Banks and Federal Home Loan Banks. Restricted equity securities are carried at cost as these securities do not have a readily determined fair value because ownership of these shares is restricted and they lack a market. The fair value of our securities portfolio is generally based on a single price for each financial instrument provided to us by a third-party pricing service determined by one or more of the following: • Quoted prices for similar, but not identical, assets or liabilities in active markets; • Quoted prices for identical or similar assets or liabilities in inactive markets; • Inputs other than quoted prices that are observable, such as interest rate and yield curves, volatilities, prepayment speeds, loss severities, credit risks and default rates; and • Other inputs derived from or corroborated by observable market inputs. The underlying methods used by the third-party pricing services are considered in determining the primary inputs used to determine fair values. We evaluate the methodologies employed by the third-party pricing services by comparing the price provided by the pricing service with other sources, including brokers' quotes, sales or purchases of similar instruments and discounted cash flows to establish a basis for reliance on the pricing service values. Significant differences between the pricing service provided value and other sources are discussed with the pricing service to understand the basis for their values. Based on all observable inputs, management may adjust prices obtained from third-party pricing services to more appropriately reflect the prices that would be received to sell assets or paid to transfer liabilities in orderly transactions in the current market. Derivative Instruments Derivative instruments may be used by the Company as part of its internal risk management programs or may be offered to customers. All derivative instruments are carried at fair value and changes in fair value are generally reported in income as they occur. The determination of fair value of derivative instruments considers changes in interest rates, commodity prices and foreign exchange rates. Fair values for exchange-traded contracts are based on quoted prices in an active market for identical instruments. Fair values for over-the-counter contracts are generated internally using third-party valuation models. Inputs used in third-party valuation models to determine fair values are considered significant other observable inputs. Credit risk is also considered in determining fair value. Deterioration in the credit rating of customers or other counterparties reduces the fair value of asset contracts. Deterioration of our credit rating could decrease the fair value of our derivative liabilities. When bilateral netting agreements or similar agreements exist between the Company and its counterparties that create a single legal claim or obligation to pay or receive the net amount in settlement of the individual derivative contracts, the Company reports derivative assets and liabilities on a net by derivative contract by counterparty basis. Derivative contracts may also require the Company to provide or receive cash margin as collateral for derivative assets and liabilities. Derivative assets and liabilities are reported net of cash margin when certain conditions are met. In addition, derivative contracts executed with customers under Customer Risk Management Programs may be secured by non-cash collateral in conjunction with a credit agreement with that customer. Access to collateral in the event of default is reasonably assured. BOK Financial offers programs that permit its customers to manage various risks, including fluctuations in energy, cattle and other agricultural products, interest rates and foreign exchange rates with derivative contracts. Customers may also manage interest rate risk through interest rate swaps used by the borrower to modify interest rate terms of their loans. Derivative contracts are executed between the customers and BOK Financial. Offsetting contracts are executed between BOK Financial and other selected counterparties to minimize market risk from changes in commodity prices, interest rates or foreign exchange rates. The counterparty contracts are identical to customer contracts, except for a fixed pricing spread or fee paid to BOK Financial as profit and compensation for administrative costs and credit risk which is recognized over the life of the contracts and included in Other Operating Revenue - Brokerage and trading revenue in the Consolidated Statements of Earnings. BOK Financial may offer derivative instruments such as to-be-announced U.S. agency residential mortgage-backed securities to mortgage banking customers to enable them to manage their market risk or to mitigate the Company's market risk of holding trading securities. Changes in the fair value of derivative instruments for trading purposes or used to mitigate the market risk of holding trading securities are included in Other Operating Revenue - Brokerage and trading revenue. BOK Financial may use derivative instruments in managing its interest rate sensitivity, as part of its economic hedge of the changes in the fair value of mortgage servicing rights. Changes in the fair value of derivative instruments used in managing interest rate sensitivity and as part of its economic hedge of changes in the fair value of mortgage servicing rights are included in Other Operating Revenue - Gain (loss) on derivatives, net in the Consolidated Statements of Earnings. BOK Financial also enters into mortgage loan commitments that are considered derivative contracts. Forward sales contracts that have not been designated as hedging instruments are used to economically hedge these mortgage loan commitments as well as mortgage loans held for sale. Mortgage loan commitments, forward sales contracts, and residential mortgage loans held for sale are carried at fair value. Changes in the fair value are reported in Other Operating Revenue - Mortgage banking revenue. Loans Loans are either secured or unsecured based on the type of loan and the financial condition of the borrower. Repayment is generally expected from cash flow or proceeds from the sale of selected assets of the borrower. BOK Financial is exposed to risk of loss on loans due to the borrower's financial difficulties, which may arise from any number of factors, including problems within the respective industry or local economic conditions. Access to collateral, in the event of borrower default, is reasonably assured through adherence to applicable lending laws and through sound lending standards and credit review procedures. Accounting policies for all loans, excluding residential mortgage loans guaranteed by U.S. government agencies, are as follows. Interest is accrued at the applicable interest rate on the outstanding principal amount. Loans are placed on nonaccruing status when, in the opinion of management, full collection of principal or interest is uncertain. Internally risk graded loans are individually evaluated for nonaccruing status quarterly. Non-risk graded loans are generally placed on nonaccruing status when 90 days or more past due or within 60 days of being notified of the borrower's bankruptcy filing. Interest previously accrued but not collected is charged against interest income when the loan is placed on nonaccruing status. Payments received on nonaccruing loans are applied to principal or recognized as interest income, according to management's judgment as to the collectability of principal. Loans may be returned to accruing status when, in the opinion of management, full collection of principal and interest, including principal previously charged off, is probable based on improvements in the borrower's financial condition or a sustained period of performance. For loans acquired with no evidence of credit deterioration, discounts are accreted on either an individual basis for loans with unique characteristics or on a pool basis for groups of homogeneous loans. Accretion is discontinued when a loan with an individually attributed discount is placed on nonaccruing status. Loans to borrowers experiencing financial difficulties may be modified in troubled debt restructurings ("TDRs"). TDRs are generally classified as nonaccruing, excluding loans guaranteed by U.S. government agencies. Modifications generally consist of extension of payment terms or interest rate concessions and may result either voluntarily through negotiations with the borrower or involuntarily through court order. Payment deferrals of up to six months are generally considered to be short-term modifications. Generally, principal and accrued but unpaid interest is not voluntarily forgiven. Performing loans may be renewed under the then current collateral, debt service ratio and other underwriting standards. Nonaccruing loans may also be renewed and will remain classified as nonaccruing. Occasionally, loans, other than residential mortgage loans, may be held for sale in order to manage credit concentration. These loans are carried at the lower of cost or fair value with gains or losses recognized in gain (loss) on assets. All loans are charged-off when the loan balance or a portion of the loan balance is no longer supported by the paying capacity of the borrower or when the required cash flow is reduced in a TDR. The charge-off amount is determined through an evaluation of available cash resources and collateral value. Internally risk graded loans are evaluated quarterly and charge-offs are taken in the quarter in which the loss is identified. Non-risk graded loans that are past due between 60 days and 180 days, based on the loan product type, are charged off. Loans to borrowers whose personal obligation has been discharged through Chapter 7 bankruptcy proceedings are charged off within 60 days of notice of the bankruptcy filing, regardless of payment status. Loan origination and commitment fees and direct loan acquisition and origination costs are deferred and amortized as an adjustment to yield over the life of the loan or over the commitment period, as applicable. Amortization does not anticipate loan prepayments. Net unamortized fees are recognized in full at time of payoff. Qualifying residential mortgage loans guaranteed by U.S. government agencies have been sold into GNMA pools. Under certain performance conditions specified in government programs, the Company has the right, but not the obligation to repurchase loans from GNMA pools. These loans no longer qualify for sale accounting and are recognized in the Consolidated Balance Sheets. Guaranteed loans are considered to be impaired because we do not expect to receive all principal and interest based on the loan's contractual terms. A portion of the principal balance continues to be guaranteed; however, interest accrues at a curtailed rate as specified in the programs. The carrying value of these loans is reduced based on an estimate of expected cash flows discounted at the original note rate plus a liquidity spread. Guaranteed loans may be modified in TDRs in accordance with U.S. government agency guidelines. Interest continues to accrue at the modified rate. Guaranteed loans may either be resold into GNMA pools after a performance period specified by the programs or foreclosed and conveyed to the guarantors. Loans are disaggregated into portfolio segments and further disaggregated into classes. The portfolio segment is the level at which the Company develops and documents a systematic method for determining its Allowance for Credit Losses. Classes are based on the risk characteristics of the loans and the Company's method for monitoring and assessing credit risk. Allowances for Credit Losses and Accrual for Off-balance Sheet Credit Risk from Unfunded Loans Commitments BOK Financial’s accounting policies have changed significantly with the adoption of CECL as of January 1, 2020. Prior periods are not restated. Prior to January 1, 2020, general allowances and nonspecific allowances were based on incurred credit losses in accordance with accounting policies disclosed in Note 1 of the Consolidated Financial Statements included in the 2019 Form 10-K. The allowance for loan losses and accrual for off-balance sheet credit risk from unfunded loan commitments represent the portion of the amortized cost basis of loans that we do not expect to collect over the asset’s contractual life, considering past events, current conditions, and reasonable and supportable forecasts of future economic conditions. The appropriateness of the allowance for credit losses, including industry and product adjustments, is assessed quarterly by a senior management Allowance Committee. This review is based on an on-going evaluation of the estimated expected credit losses in the portfolio and on unused commitments to provide financing. A well-documented methodology has been developed and is applied by an independent Credit Administration department to assure consistency across the Company. The allowance for loan losses consists of specific allowances attributed to certain individual loans, generally nonaccruing loans, with dissimilar risk characteristics that have not yet been charged down to amounts we expect to recover and general allowances for estimated credit losses on pools of loans that share similar risk characteristics. When full collection of principal or interest is uncertain, the loan’s risk characteristics have changed, and we exclude the loan from the general allowance pool, typically designating it as nonaccruing. For these loans, a specific allowance reflects the expected credit loss. We measure specific allowances for loans excluded from the general allowance pool by an evaluation of estimated future cash flows discounted at the loan's initial effective interest rate or the fair value of collateral for certain collateral dependent loans. For a non-collateral dependent loan, the specific allowance is the amount by which the loan’s amortized cost basis exceeds its net realizable value. We measure the specific allowance for collateral dependent loans as the amount by which the loan’s amortized cost basis exceeds its fair value. When repayment is expected to be provided substantially through the sale of collateral, we deduct estimated selling costs from the collateral’s fair value. Generally, third party appraisals that conform to Uniform Standards of Professional Appraisal Practice serve as the basis for the fair value of real property held as collateral. These appraised values are on an “as-is” basis and generally are not adjusted by the Company. We obtain updated appraisals at least annually or more frequently if market conditions indicate collateral values may have declined. For energy loans, our internal staff of engineers generally determines collateral value of mineral rights based on projected cash flows from proven oil and gas reserves under existing economic and operating conditions. For real property held as collateral for other loans, third party appraisals that conform to Uniform Standards of Professional Appraisal Practice generally serve as the basis for the fair value. These appraised values are on an “as-is” basis and generally are not adjusted by the Company. We obtain updated appraisals at least annually or more frequently if market conditions indicate collateral values may have declined. Our special assets staff generally determines the value of other collateral based on projected liquidation cash flows under current market conditions. We evaluate collateral values and available cash resources quarterly. Historical statistics may be used to estimate specific allowances in limited situations, such as when a collateral dependent loan is removed from the general allowance pool near the end of a reporting period until an appraisal of collateral value is received or a full assessment of future cash flows is completed. General allowances estimate expected credit losses on pools of loans sharing similar risk characteristics that are expected to occur over the loan’s estimated remaining life. The loan’s estimated remaining life represents the contractual term adjusted for amortization, estimates of prepayments, and borrower-owned extension options. Approximately 90 percent of the committed dollars in the loan portfolio is risk graded loans with general allowance model inputs that include probability of default, loss given default, and exposure at default. Probability of default is based on the migration of loans from performing to nonperforming using historical life of loan analysis periods. Loss given default is based on the aggregate losses incurred, net of estimated recoveries. Exposure at default represents an estimate of the outstanding amount of credit exposure at the time a default may occur. Charge-off migration is used to calculate the general allowance for the majority of non-risk graded loans to individuals. The expected credit loss on less than 10% of the committed dollars in the portfolio is calculated using charge-off migration. The expected credit loss on approximately 1% of the committed dollars in the portfolio is calculated using a non-modeled approach. Specifically, the calculation applies a long-term net charge-off rate to the loan balances, adjusted for the weighted average remaining maturity of each portfolio. In estimating the expected credit losses for general allowances on performing risk-graded loans, each portfolio class is assigned relevant economic loss drivers which best explain variations in portfolio net loss rates. The probability of default estimates for each portfolio class are adjusted for current and forecasted economic conditions. The result is applied to the exposure at default and loss given default to calculate the lifetime expected credit loss estimate. Selection of relevant economic loss drivers is re-evaluated periodically and involves statistical analysis as well as management judgment. The unemployment rate factors significantly in the allowance for loan losses calculation, affecting commercial and loans to individuals segments. Other primary factors impacting the commercial portfolio include BBB corporate spreads, real gross domestic product growth rate, and energy commodity prices. The primary commercial real estate variables are vacancy rate and BBB corporate spreads. In addition to the unemployment rate, the forecast for loans to individuals is tied to home price index. The forecasts may include regional economic factors when localized conditions diverge from national conditions. An Economic Forecast Committee, consisting of senior management with members largely independent of the allowance process develops a twelve-month forward-looking forecast for the relevant economic loss drivers. Management develops these forecasts based on external data as well as a view of future economic conditions, which may include adjustments for regional conditions. The forecast includes three economic scenarios and probability weights for each scenario. The base forecast represents management's view of the most likely outcome, while the downside forecast reflects reasonably possible worsening economic conditions, and the upside forecast projects reasonably possible improving conditions. At the end of the one-year reasonable and supportable forecast period, we transition from shorter-term expected losses to long-term loss averages for the loan’s estimated remaining life. The difference between short-term loss forecasts and long-term loss averages is run-off over the reversion horizon, up to three years, depending on the forecasted economic scenarios. General allowances also consider the estimated impact of factors that are not captured in the modeled results or historical experience. These factors may increase or decrease modeled results by amounts determined by the Allowance Committee. Factors not captured in modeled results or historical experience may include for example, new lines of business, market conditions that have not been previously encountered, observed changes in credit risk that are not yet reflected in macro-economic factors, or economic conditions that impact loss given default assumptions. The accrual for off-balance sheet credit risk is maintained at a level that is appropriate to cover estimated losses associated with credit instruments that are not currently recognized as assets such as loan commitments, standby letters of credit or guarantees that are not unconditionally cancellable by the bank. This accrual is included in other liabilities in the Consolidated Balance Sheets. The appropriateness of the accrual is determined in the same manner as the allowance for loan losses, with the added consideration of commitment usage over the remaining life for those loans that the bank can not unconditionally cancel. A provision for credit losses is charged against or credited to earnings in amounts necessary to maintain an appropriate All

Securities

Securities	12 Months Ended
	Dec. 31, 2021
Marketable Securities [Abstract]
Securities [Text Block]	Securities Trading Securities The fair value and net unrealized gain (loss) included in trading securities is as follows (in thousands): December 31, 2021 December 31, 2020 Fair Value Net Unrealized Gain (Loss) Fair Value Net Unrealized Gain (Loss) U.S. government securities $ 23,610 $ 40 $ 9,183 $ — Residential agency mortgage-backed securities 9,068,900 (9,338) 4,669,148 (3,624) Municipal securities 25,783 34 19,172 42 Other debt securities 18,520 (26) 10,472 22 Total trading securities $ 9,136,813 $ (9,290) $ 4,707,975 $ (3,560) Investment Securities The amortized cost and fair values of investment securities are as follows (in thousands): December 31, 2021 Amortized Fair Gross Unrealized Cost Value Gain Loss Municipal securities $ 203,772 $ 223,609 $ 19,851 $ (14) Residential agency mortgage-backed securities 6,939 7,500 561 — Other debt securities 288 286 — (2) Total investment securities $ 210,999 $ 231,395 $ 20,412 $ (16) Allowance for credit losses 1 (555) Investment securities, net of allowance $ 210,444 $ 231,395 $ 20,412 $ (16) 1 Effective with the adoption of FASB ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326) on January 1, 2020. December 31, 2020 Amortized Fair Gross Unrealized Cost Value Gain Loss Municipal securities $ 229,245 $ 255,270 $ 26,169 $ (144) Residential agency mortgage-backed securities 8,913 9,790 877 — Other debt securities 7,373 7,371 — (2) Total investment securities $ 245,531 $ 272,431 $ 27,046 $ (146) Allowance for credit losses 1 (688) Investment securities, net of allowance $ 244,843 $ 272,431 $ 27,046 $ (146) 1 Effective with the adoption of FASB ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326) on January 1, 2020. The amortized cost and fair values of investment securities at December 31, 2021, by contractual maturity, are as shown in the following table (dollars in thousands): Less than One to Six to Over Total Weighted Average Maturity 1 Fixed maturity debt securities: Amortized cost $ 21,800 $ 103,923 $ 72,262 $ 6,075 $ 204,060 4.45 Fair value 21,960 117,750 78,053 6,132 223,895 Residential mortgage-backed securities: Amortized cost $ 6,939 2 Fair value 7,500 Total investment securities: Amortized cost $ 210,999 Fair value 231,395 1 Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without penalty. 2 The average expected lives of residential mortgage-backed securities were 4.1 years based upon current prepayment assumptions. Temporarily Impaired Investment Securities (in thousands): December 31, 2021 Number of Securities Less Than 12 Months 12 Months or Longer Total Fair Unrealized Fair Unrealized Fair Unrealized Investment: Municipal securities 1 $ — $ — $ 587 $ 14 $ 587 $ 14 Other debt securities 2 $ 273 $ 2 $ — $ — $ 273 $ 2 Total investment securities 3 $ 273 $ 2 $ 587 $ 14 $ 860 $ 16 December 31, 2020 Number of Securities Less Than 12 Months 12 Months or Longer Total Fair Unrealized Fair Unrealized Fair Unrealized Investment: Municipal securities 6 $ 2,451 $ 40 $ 2,043 $ 104 $ 4,494 $ 144 Other debt securities 2 250 1 25 1 275 2 Total investment securities 8 $ 2,701 $ 41 $ 2,068 $ 105 $ 4,769 $ 146 Available for Sale Securities The amortized cost and fair value of available for sale securities are as follows (in thousands): December 31, 2021 Amortized Fair Gross Unrealized Cost Value Gain Loss U.S. Treasury $ 1,001 $ 1,000 $ — $ (1) Municipal securities 515,551 508,365 1,302 (8,488) Mortgage-backed securities: Residential agency 7,908,587 8,006,616 155,477 (57,448) Residential non-agency 10,625 24,339 13,714 — Commercial agency 4,628,172 4,617,025 36,868 (48,015) Other debt securities 500 472 — (28) Total available for sale securities $ 13,064,436 $ 13,157,817 $ 207,361 $ (113,980) December 31, 2020 Amortized Fair Gross Unrealized Cost Value Gain Loss U.S. Treasury $ 500 $ 508 $ 8 $ — Municipal securities 165,318 167,979 2,666 (5) Mortgage-backed securities: Residential agency 9,019,013 9,340,471 328,183 (6,725) Residential non-agency 17,563 32,770 15,207 — Commercial agency 3,406,956 3,508,465 103,590 (2,081) Other debt securities 500 472 — (28) Total available for sale securities $ 12,609,850 $ 13,050,665 $ 449,654 $ (8,839) The amortized cost and fair values of available for sale securities at December 31, 2021, by contractual maturity, are as shown in the following table (dollars in thousands): Less than One to Six to Over Total Weighted Average Maturity 1 Fixed maturity debt securities: Amortized cost $ 74,454 $ 1,881,944 $ 2,695,022 $ 493,804 $ 5,145,224 6.76 Fair value 74,874 1,898,237 2,657,759 495,992 5,126,862 Residential mortgage-backed securities: Amortized cost $ 7,919,212 2 Fair value 8,030,955 Total available-for-sale securities: Amortized cost $ 13,064,436 Fair value 13,157,817 1 Expected maturities may differ from contractual maturities, because borrowers may have the right to call or prepay obligations with or without penalty. 2 The average expected lives of residential mortgage-backed securities were 3.7 years based upon current prepayment assumptions. Sales of available for sale securities resulted in gains and losses as follows (in thousands): Year Ended December 31, 2021 2020 2019 Proceeds $ 622,881 $ 384,507 $ 1,211,718 Gross realized gains 5,702 9,976 14,996 Gross realized losses (1,998) (66) (9,399) Related federal and state income tax expense 889 2,524 1,425 The fair value of debt securities pledged as collateral for repurchase agreements, public trust funds on deposit and for other purposes, as required by law was $10.2 billion at December 31, 2021 and $11.6 billion at December 31, 2020. The secured parties do not have the right to sell or re-pledge these securities. Temporarily Impaired Available for Sale Securities (In thousands) December 31, 2021 Number of Securities Less Than 12 Months 12 Months or Longer Total Fair Unrealized Fair Unrealized Fair Unrealized Available for sale: U.S. Treasury 1 $ 1,000 $ 1 $ — $ — $ 1,000 $ 1 Municipal securities 175 423,575 7,762 22,476 726 446,051 8,488 Mortgage-backed securities: Residential agency 120 $ 2,382,094 $ 37,121 $ 750,044 $ 20,327 $ 3,132,138 $ 57,448 Commercial agency 165 2,104,689 35,488 703,216 12,527 2,807,905 48,015 Other debt securities 1 — — 472 28 472 28 Total available for sale securities 462 $ 4,911,358 $ 80,372 $ 1,476,208 $ 33,608 $ 6,387,566 $ 113,980 December 31, 2020 Number of Securities Less Than 12 Months 12 Months or Longer Total Fair Unrealized Fair Unrealized Fair Unrealized Available for sale: Municipal securities 1 6,166 5 — — 6,166 5 Mortgage-backed securities: Residential agency 38 $ 786,890 $ 6,605 $ 160,747 $ 120 $ 947,637 $ 6,725 Commercial agency 37 350,506 1,587 277,627 494 628,133 2,081 Other debt securities 1 — — 472 28 472 28 Total available for sale securities 77 $ 1,143,562 $ 8,197 $ 438,846 $ 642 $ 1,582,408 $ 8,839 No credit impairment of available for sale securities was identified in 2021. Unrealized losses related to changes in interest rates subsequent to purchase and are not attributable to credit. Based on evaluations of impaired securities as of December 31, 2021, the Company does not intend to sell any impaired available for sale securities before fair value recovers to the current amortized cost and it is more-likely-than-not that the Company will not be required to sell impaired securities before fair value recovers, which may be maturity. Fair Value Option Securities Fair value option securities represent securities which the Company has elected to carry at fair value and are separately identified on the Consolidated Balance Sheets with changes in the fair value recognized in earnings as they occur. Certain residential mortgage-backed securities issued by U.S. government agencies and derivative contracts are held as an economic hedge of the mortgage servicing rights. The fair value and net unrealized gain (loss) included in fair value option securities is as follows (in thousands): December 31, 2021 December 31, 2020 Fair Value Net Unrealized Gain (Loss) Fair Value Net Unrealized Gain (Loss) Residential agency mortgage-backed securities 43,770 1,591 114,982 4,463

Derivatives

Derivatives	12 Months Ended
	Dec. 31, 2021
Derivative Instrument Detail [Abstract]
Derivatives [Text Block]	Derivatives The following table summarizes the fair values of derivative contracts recorded as “derivative contracts” assets and liabilities in the balance sheet at December 31, 2021 (in thousands): Assets Notional 1 Gross Fair Value Netting Adjustments Net Fair Value Before Cash Collateral Cash Collateral Fair Value Net of Cash Collateral Customer risk management programs: Interest rate contracts $ 2,614,162 $ 53,881 $ (10,101) $ 43,780 $ — $ 43,780 Energy contracts 6,360,095 1,168,363 (375,624) 792,739 — 792,739 Agricultural contracts — — — — — — Foreign exchange contracts 216,272 215,148 — 215,148 — 215,148 Equity option contracts 42,136 755 — 755 (242) 513 Total customer risk management programs 9,232,665 1,438,147 (385,725) 1,052,422 (242) 1,052,180 Trading 35,592,751 139,694 (104,326) 35,368 (721) 34,647 Interest rate risk management programs 869,506 10,687 (217) 10,470 — 10,470 Total derivative contracts $ 45,694,922 $ 1,588,528 $ (490,268) $ 1,098,260 $ (963) $ 1,097,297 Liabilities Notional¹ Gross Fair Value Netting Adjustments Net Fair Value Before Cash Collateral Cash Collateral Fair Value Net of Cash Collateral Customer risk management programs: Interest rate contracts $ 2,614,162 $ 54,062 $ (10,101) $ 43,961 $ (33,870) $ 10,091 Energy contracts 6,480,840 1,210,946 (375,624) 835,322 (803,102) 32,220 Agricultural contracts — — — — — — Foreign exchange contracts 208,381 207,119 — 207,119 (447) 206,672 Equity option contracts 42,136 755 — 755 — 755 Total customer risk management programs 9,345,519 1,472,882 (385,725) 1,087,157 (837,419) 249,738 Trading 41,285,649 152,947 (104,326) 48,621 (24,074) 24,547 Interest rate risk management programs 298,832 1,557 (217) 1,340 — 1,340 Total derivative contracts $ 50,930,000 $ 1,627,386 $ (490,268) $ 1,137,118 $ (861,493) $ 275,625 1 Notional amounts for commodity contracts are converted into dollar-equivalent amounts based on dollar prices at the inception of the contract. The following table summarizes the fair values of derivative contracts recorded as “derivative contracts” assets and liabilities in the balance sheet at December 31, 2020 (in thousands): Assets Notional 1 Gross Fair Value Netting Adjustments Net Fair Value Before Cash Collateral Cash Collateral Fair Value Net of Cash Collateral Customer risk management programs: Interest rate contracts $ 3,212,469 $ 113,524 $ (144) $ 113,380 $ — $ 113,380 Energy contracts 3,791,565 386,008 (211,468) 174,540 — 174,540 Agricultural contracts 14,765 3,859 — 3,859 — 3,859 Foreign exchange contracts 337,001 332,257 — 332,257 (420) 331,837 Equity option contracts 70,199 1,222 — 1,222 (285) 937 Total customer risk management programs 7,425,999 836,870 (211,612) 625,258 (705) 624,553 Trading 84,997,593 440,627 (240,655) 199,972 (26,958) 173,014 Internal risk management programs 995,123 17,352 (4,231) 13,121 — 13,121 Total derivative contracts $ 93,418,715 $ 1,294,849 $ (456,498) $ 838,351 $ (27,663) $ 810,688 Liabilities Notional¹ Gross Fair Value Netting Adjustments Net Fair Value Before Cash Collateral Cash Collateral Fair Value Net of Cash Collateral Customer risk management programs: Interest rate contracts $ 3,212,469 $ 113,900 $ (144) $ 113,756 $ (104,202) $ 9,554 Energy contracts 3,617,678 361,334 (211,468) 149,866 (114,070) 35,796 Agricultural contracts 14,781 3,844 — 3,844 (3,844) — Foreign exchange contracts 336,223 331,035 — 331,035 (1,165) 329,870 Equity option contracts 70,199 1,222 — 1,222 — 1,222 Total customer risk management programs 7,251,350 811,335 (211,612) 599,723 (223,281) 376,442 Trading 88,929,916 414,801 (240,655) 174,146 (145,692) 28,454 Internal risk management programs 145,256 5,529 (4,231) 1,298 (415) 883 Total derivative contracts $ 96,326,522 $ 1,231,665 $ (456,498) $ 775,167 $ (369,388) $ 405,779 1 Notional amounts for commodity contracts are converted into dollar-equivalent amounts based on dollar prices at the inception of the contract. The following summarizes the pre-tax net gains (losses) on derivative instruments and where they are recorded in the Consolidated Statements of Earnings (in thousands): Year Ended December 31, 2021 2020 2019 Brokerage Gain (Loss) Brokerage Gain (Loss) Brokerage Gain (Loss) Customer risk management programs: Interest rate contracts To-be-announced U.S. agency residential mortgage-backed securities 1 $ — $ — $ — $ — $ 9,579 $ — Interest rate swaps 5,503 — 4,507 — 3,647 — Energy contracts 14,190 — 17,287 — 5,064 — Agricultural contracts 27 — 34 — 28 — Foreign exchange contracts 712 — 921 — 623 — Equity option contracts — — — — — — Total customer risk management programs 20,432 — 22,749 — 18,941 — Trading 2 (11,453) — 8,255 — 13,999 — Internal risk management programs — (19,378) — 42,320 — 14,951 Total derivative contracts $ 8,979 $ (19,378) $ 31,004 $ 42,320 $ 32,940 $ 14,951 1 To-be-announced U.S. agency residential mortgage-backed securities customer hedging program transitioned to trading program during 2019. 2 Includes changes in fair value of to-be-announced U.S. agency residential mortgage-backed securities and other derivative instruments offered to mortgage banking customers to manage their market risk or held to mitigate market risk of trading securities portfolio, which is offset by changes in fair value of trading securities also included in Brokerage and trading revenue in the Consolidated Statement of Earnings. As discussed in Note 7, certain derivative contracts not designated as hedging instruments related to mortgage loan commitments and forward sales contracts are included in Residential mortgage loans held for sale on the Consolidated Balance Sheets. See Note 7 for additional discussion of notional, fair value and impact on earnings of these contracts. No derivative contracts have been designated as hedging instruments for financial reporting purposes.

Loans and Allowances for Credit

Loans and Allowances for Credit Losses	12 Months Ended
	Dec. 31, 2021
Loans and Leases Receivable, Net Amount [Abstract]
Loans [Text Block]	The portfolio segments of the loan portfolio are as follows (in thousands): December 31, 2021 December 31, 2020 Fixed Variable Non-accrual Total Fixed Variable Non-accrual Total Commercial $ 3,360,117 $ 9,072,244 $ 74,104 $ 12,506,465 $ 3,174,203 $ 9,736,173 $ 167,159 $ 13,077,535 Commercial real estate 929,015 2,888,048 14,262 3,831,325 1,047,486 3,623,806 27,246 4,698,538 Paycheck protection program 276,341 — — 276,341 1,682,310 — — 1,682,310 Loans to individuals 2,037,792 1,508,064 45,693 3,591,549 2,174,874 1,333,975 40,288 3,549,137 Total $ 6,603,265 $ 13,468,356 $ 134,059 $ 20,205,680 $ 8,078,873 $ 14,693,954 $ 234,693 $ 23,007,520 Foregone interest on nonaccrual loans $ 14,102 $ 22,870 At December 31, 2021, loans to businesses and individuals with collateral primarily located in Texas totaled $6.8 billion or 34% of the total loan portfolio. Loans to businesses and individuals with collateral primarily located in Oklahoma totaled $3.2 billion or 16% of our total loan portfolio. Loans to businesses and individuals with collateral primarily located in Colorado totaled $2.5 billion or 12% of our total loan portfolio. Loans for which the collateral location is not relevant, such as unsecured loans and reserve-based energy loans, are distributed by the borrower’s primary operating location. These geographic concentrations subject the loan portfolio to the general economic conditions within these areas. At December 31, 2020, loans to businesses and individuals with collateral primarily located in Texas totaled $7.2 billion or 31% of the loan portfolio, loans to businesses and individuals with collateral primarily located in Oklahoma totaled $3.8 billion or 17% of the loan portfolio and loans to businesses and individuals with collateral primarily located in Colorado totaled $2.8 billion or 12% of the loan portfolio. Commercial Commercial loans represent loans for working capital, facilities acquisition or expansion, purchases of equipment and other needs of commercial customers primarily located within our geographical footprint. Commercial loans are underwritten individually and represent on-going relationships based on a thorough knowledge of the customer, the customer’s industry and market. While commercial loans are generally secured by the customer’s assets including real property, inventory, accounts receivable, operating equipment, interest in mineral rights and other property and may also include personal guarantees of the owners and related parties, the primary source of repayment of the loans is the on-going cash flow from operations of the customer’s business. Inherent lending risk is centrally monitored on a continuous basis from underwriting throughout the life of the loan for compliance with commercial lending policies. At December 31, 2021, commercial loans with collateral primarily located in Texas totaled $4.4 billion or 35% of the commercial loan portfolio segment. Commercial loans with collateral primarily located in Oklahoma totaled $1.7 billion or 13% of the commercial loan portfolio segment. Commercial loans with collateral primarily located in Colorado totaled $1.6 billion or 13% of the commercial loan portfolio segment. The commercial loan portfolio segment is further divided into loan classes. The services loan class totaled $3.4 billion or 17% of total loans. Approximately $1.7 billion of loans in the services class consisted of loans with individual balances of less than $10 million. Businesses included in the services class include Native American tribal and state and local municipal government entities, Native American tribal casino operations, educational services, foundations and not-for-profit organizations and specialty trade contractors. The energy loan class totaled $3.0 billion or 15% of total loans, including $2.2 billion of outstanding loans to energy producers. Approximately 67% of the committed production loans are secured by properties primarily producing oil and 33% of the committed production loans are secured by properties primarily producing natural gas. The healthcare loan class totaled $3.4 billion or 17% of total loans. The healthcare loan class consists primarily of loans for the development and operation of senior housing and care facilities, including independent living, assisted living and skilled nursing. Healthcare also includes loans to hospitals and other medical service providers. At December 31, 2020, commercial loans with collateral primarily located in Texas totaled $4.3 billion or 33% of the commercial loan portfolio segment, commercial loans with collateral primarily located in Oklahoma totaled $1.8 billion or 14% of the commercial loan portfolio segment and commercial loans with collateral primarily located in Colorado totaled $1.7 billion or 13% of the commercial loan portfolio segment. The energy loan class totaled $3.5 billion or 15% of total loans, including $2.6 billion of outstanding loans to energy producers. At December 31, 2020, approximately 58% of committed production loans were secured by properties primarily producing oil and 42% were secured by properties producing natural gas. The services loan class totaled $3.5 billion or 15% of total loans. Approximately $1.5 billion of loans in the services category consisted of loans with individual balances of less than $10 million. The healthcare loan class totaled $3.3 billion or 14% of total loans. Commercial Real Estate Commercial real estate loans are for the construction of buildings or other improvements to real estate and property held by borrowers for investment purposes primarily within our geographical footprint. We require collateral values in excess of the loan amounts, demonstrated cash flows in excess of expected debt service requirements, equity investment in the project and a portion of the project already sold, leased or permanent financing already secured. The expected cash flows from all significant new or renewed income producing property commitments are stress tested to reflect the risks in varying interest rates, vacancy rates and rental rates. As with commercial loans, inherent lending risks are centrally monitored on a continuous basis from underwriting throughout the life of the loan for compliance with applicable lending policies. At December 31, 2021, 30% of commercial real estate loans were secured by properties primarily located in the Dallas and Houston metropolitan areas of Texas and 12% of commercial real estate loans were secured by properties located primarily in the Tulsa and Oklahoma City metropolitan areas of Oklahoma. At December 31, 2020, 27% of commercial real estate loans are secured by properties primarily located in the Dallas and Houston metropolitan areas of Texas and 10% of commercial real estate loans were secured by properties located primarily in the Tulsa and Oklahoma City metropolitan areas of Oklahoma. Paycheck Protection Program BOK Financial is actively participating in programs initiated by the Coronavirus Aid, Relief and Economic Security Act ("CARES Act"), including the Small Business Administration's ("SBA") Paycheck Protection Program ("PPP") that began on April 3, 2020. PPP provided fully forgivable loans when utilized for qualified expenditures, including to help small business maintain payrolls during the COVID-19 pandemic. These loans generally have a contractual term of two years, though most are expected to be forgiven prior to maturity after completion of a compliance period. Loans are guaranteed and amounts forgiven will be reimbursed to the Company by the SBA. The loans carry a rate of 1%. Interest plus loan fees, which vary depending on loan size, are accrued over the contractual life of the loan. Any unaccreted origination fees will be recognized when the loan is paid. Loans to Individuals Loans to individuals include residential mortgage and personal loans. Residential mortgage loans provide funds for our customers to purchase or refinance their primary residence or to borrow against the equity in their home. These loans are secured by a first or second mortgage on the customer's primary residence. These loans are made in accordance with underwriting policies we believe to be conservative and are fully documented. Loans may be individually underwritten or credit scored based on size and other criteria. Credit scoring is assessed based on significant credit characteristics including credit history, residential and employment stability. In general, we sell the majority of our conforming fixed rate loan originations in the secondary market and retain the majority of our non-conforming and adjustable-rate mortgage loans. Our mortgage loan portfolio does not include payment option adjustable rate mortgage loans or adjustable rate mortgage loans with initial rates that are below market. Home equity loans are primarily first-lien and fully amortizing. Residential mortgage, which includes home equity loans, and personal loans are made in accordance with underwriting policies we believe to be conservative and are fully documented. Loans may be individually underwritten or credit scored based on size and other criteria. Credit scoring is assessed based on significant credit characteristics including credit history, residential and employment stability. Personal loans consist primarily of loans to Wealth Management clients secured by the cash surrender value of insurance policies and marketable securities. It also includes direct loans secured by and for the purchase of automobiles, recreational and marine equipment as well as unsecured loans. Approximately 91% of the loans in this segment are secured by collateral located within our geographical footprint. Loans for which the collateral location is less relevant, such as unsecured loans are categorized by the borrower’s primary operating location. Residential mortgage loans guaranteed by U.S. government agencies have limited credit exposure because of the agency guarantee. This amount includes residential mortgage loans previously sold into GNMA mortgage pools that the Company may repurchase when certain defined delinquency criteria are met. Because of this repurchase right, the Company is deemed to have regained effective control over these loans and must include them on the Consolidated Balance Sheet. Credit Commitments Commitments to extend credit are agreements to lend to a customer as long as there is no violation of conditions established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. At December 31, 2021, outstanding commitments totaled $12.5 billion. Because some commitments are expected to expire before being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. BOK Financial uses the same credit policies in making commitments as it does loans. The amount of collateral obtained, if deemed necessary, is based upon management’s credit evaluation of the borrower. Standby letters of credit are conditional commitments issued to guarantee the performance of a customer to a third party. Because the credit risk involved in issuing standby letters of credit is essentially the same as that involved in extending loan commitments, BOK Financial uses the same credit policies in evaluating the creditworthiness of the customer. Additionally, BOK Financial uses the same evaluation process in obtaining collateral on standby letters of credit as it does for loan commitments. The term of these standby letters of credit is defined in each commitment and typically corresponds with the underlying loan commitment. At December 31, 2021, outstanding standby letters of credit totaled $700 million. Allowances for Credit Losses and Accrual for Off-balance Sheet Credit Risk from Unfunded Loans Commitments BOK Financial maintains an allowance for loan losses and accrual for off-balance sheet credit risk from unfunded commitments. The allowance consists of specific allowances attributed to certain individual loans, generally nonaccruing loans, with dissimilar risk characteristics that have not yet been charged down to amounts we expect to recover and general allowances for estimated credit losses on pools of loans that share similar risk characteristics based on probability of default, loss given default and exposure at default for each loan class developed based on current and forecasted relevant economic loss drivers. The accrual for off-balance sheet credit risk is maintained at a level that is appropriate to cover estimated losses associated with credit instruments that are not currently recognized as assets such as loan commitments, standby letters of credit or guarantees that are not unconditionally cancellable by the bank. The activity in the allowance for loan losses and the allowance for off-balance sheet credit losses related to loan commitments and standby letters of credit for the year ended December 31, 2021 is summarized as follows (in thousands): Commercial Commercial Real Estate Paycheck Loans to Nonspecific Allowance Total Allowance for loan losses: Beginning balance, adjusted 254,934 86,558 — 47,148 — 388,640 Provision for loan losses (59,326) (26,522) — (9,354) — (95,202) Loans charged off (43,956) (2,485) — (4,910) — (51,351) Recoveries of loans previously charged off 10,404 1,002 — 2,928 — 14,334 Ending balance $ 162,056 $ 58,553 $ — $ 35,812 $ — $ 256,421 Allowance for off-balance sheet credit risk from unfunded loan commitments: Beginning balance, adjusted 14,422 20,571 — 1,928 — 36,921 Provision for off-balance sheet credit risk (610) (3,129) — (205) — (3,944) Ending balance $ 13,812 $ 17,442 $ — $ 1,723 $ — $ 32,977 Changes in our reasonable and supportable forecasts of macroeconomic variables, primarily due to the anticipated impact of the on-going COVID-19 pandemic, and other assumptions, resulted in a $90.1 million decrease in the allowance for lending activities during the year ended December 31, 2021. Changes in the loan portfolio characteristics, including specific impairment and losses, loan balances and risk grading resulted in a $9.0 million decrease in the allowance for lending activities. The activity in the allowance for loan losses and the allowance for off-balance sheet credit losses related to loan commitments and standby letters of credit for the year ended December 31, 2020 is summarized as follows (in thousands): Commercial Commercial Real Estate Paycheck Loans to Nonspecific Allowance Total Allowance for loan losses: Beginning balance $ 118,187 $ 51,805 $ — $ 23,572 $ 17,195 $ 210,759 Transition adjustment 33,681 (4,620) — 13,943 (17,195) 25,809 Beginning balance, adjusted 151,868 47,185 — 37,515 — 236,568 Provision for loan losses 171,800 40,407 — 10,253 — 222,460 Loans charged off (73,370) (1,300) — (4,729) — (79,399) Recoveries of loans previously charged off 4,636 266 — 4,109 — 9,011 Ending balance $ 254,934 $ 86,558 $ — $ 47,148 $ — $ 388,640 Allowance for off-balance sheet credit risk from unfunded loan commitments: Beginning balance $ 1,434 $ 107 $ — $ 44 $ — $ 1,585 Transition adjustment 10,144 11,660 — 1,748 — 23,552 Beginning balance, adjusted 11,578 11,767 — 1,792 — 25,137 Provision for off-balance sheet credit risk 2,844 8,804 — 136 — 11,784 Ending balance $ 14,422 $ 20,571 $ — $ 1,928 $ — $ 36,921 The allowance for loan losses and recorded investment of the related loans by portfolio segment for each impairment measurement method at December 31, 2021 is as follows (in thousands): Collectively Measured Individually Measured Total Recorded Investment Related Allowance Recorded Investment Related Allowance Recorded Investment Related Commercial $ 12,432,361 $ 158,063 $ 74,104 $ 3,993 $ 12,506,465 $ 162,056 Commercial real estate 3,817,063 56,204 14,262 2,349 3,831,325 58,553 Paycheck protection program 276,341 — — — 276,341 — Loans to individuals 3,545,856 35,812 45,693 — 3,591,549 35,812 Total $ 20,071,621 $ 250,079 $ 134,059 $ 6,342 $ 20,205,680 $ 256,421 The allowance for loan losses and recorded investment of the related loans by portfolio segment for each impairment measurement method at December 31, 2020 is as follows (in thousands): Collectively Measured Individually Measured Total Recorded Investment Related Allowance Recorded Investment Related Allowance Recorded Investment Related Commercial $ 12,910,376 $ 235,882 $ 167,159 $ 19,052 $ 13,077,535 $ 254,934 Commercial real estate 4,671,292 83,169 27,246 3,389 4,698,538 86,558 Paycheck protection program 1,682,310 — — — 1,682,310 — Loans to individuals 3,508,849 47,148 40,288 — 3,549,137 47,148 Total $ 22,772,827 $ 366,199 $ 234,693 $ 22,441 $ 23,007,520 $ 388,640 Credit Quality Indicators The Company utilizes risk grading as primary credit quality indicators as it influences the probability of default which is a key attribute in the expected credit losses calculation. Substantially all commercial as well as commercial real estate loans and certain loans to individuals are risk graded based on a quarterly evaluation of the borrowers’ ability to repay the loans. Certain commercial loans and most loans to individuals are small, homogeneous pools that are not risk-graded. The credit quality of these loans is based on past due days in accordance with regulatory guidelines. We have included in the credit quality indicator “pass” loans that are in compliance with the original terms of the agreement and currently exhibit no factors that cause management to have doubts about the borrowers’ ability to remain in compliance with the original terms of the agreement, which is consistent with the regulatory guideline of “pass.” This also includes past due residential mortgages that are guaranteed by agencies of the U.S. government that continue to accrue interest based on criteria of the guarantors’ programs. Other loans especially mentioned ("Special Mention") are currently performing in compliance with the original terms of the agreement but may have a potential weakness that deserves management’s close attention, consistent with regulatory guidelines. Non-graded loans 30 to 59 days past due are categorized as Special Mention. The risk grading process identified certain loans that have a well-defined weakness (for example, inadequate debt service coverage or liquidity or marginal capitalization; repayment may depend on collateral or other risk mitigation) that may jeopardize liquidation of the debt and represent a greater risk due to deterioration in the financial condition of the borrower. This is consistent with the regulatory guideline for “substandard.” Because the borrowers are still performing in accordance with the original terms of the loan agreements, these loans remain on accruing status. Non-graded loans 60 to 89 days past due are categorized as Accruing Substandard. Nonaccruing loans represent loans for which full collection of principal and interest is uncertain. This includes certain loans considered “substandard” and all loans considered “doubtful” by regulatory guidelines. Non-graded loans 90 or more days past due are categorized as Nonaccrual. Probability of default is lowest for pass graded loans and increases for each credit quality indicator, Special Mention, and Accruing Substandard. Vintage represents the year of origination, except for revolving loans which are considered in aggregate. Loans that were once revolving but have converted to term loans without additional underwriting appear in a separate vintage column. The following table summarizes the Company's loan portfolio at December 31, 2021 by the risk grade categories and vintage (in thousands): Origination Year 2021 2020 2019 2018 2017 Prior Revolving Loans Revolving Loans Converted to Term Loans Total Commercial: Energy Pass $ 252,133 $ 29,556 $ 15,914 $ 13,548 $ 4,741 $ 6,765 $ 2,540,525 $ — $ 2,863,182 Special Mention 558 771 — — — — 750 — 2,079 Accruing Substandard 10,650 22,611 1,185 814 — 716 74,556 — 110,532 Nonaccrual — 20,487 — — — 714 9,890 — 31,091 Total energy 263,341 73,425 17,099 14,362 4,741 8,195 2,625,721 — 3,006,884 Healthcare Pass 563,800 589,193 516,558 498,998 319,096 688,136 160,154 26 3,335,961 Special Mention 6,835 — 15,583 — 11,135 — 5 — 33,558 Accruing Substandard — — 27,135 543 — 1,981 — — 29,659 Nonaccrual — — — 6,542 — 8,711 509 — 15,762 Total healthcare 570,635 589,193 559,276 506,083 330,231 698,828 160,668 26 3,414,940 Services Pass 696,149 405,057 289,375 275,010 225,404 795,029 607,958 375 3,294,357 Special Mention 434 405 1,830 1,047 3,290 47 17,210 192 24,455 Accruing Substandard 43 530 4,166 10,714 1,785 2,366 11,607 — 31,211 Nonaccrual — — — 230 13,918 2,519 503 — 17,170 Total services 696,626 405,992 295,371 287,001 244,397 799,961 637,278 567 3,367,193 General business Pass 584,438 211,892 264,462 177,384 168,977 215,014 1,047,420 2,284 2,671,871 Special Mention 218 223 60 1,435 3,842 — 5,875 — 11,653 Accruing Substandard 265 1,066 1,634 7,697 8,336 3,024 1,821 — 23,843 Nonaccrual — 2,444 4,562 1,046 762 518 730 19 10,081 Total general business 584,921 215,625 270,718 187,562 181,917 218,556 1,055,846 2,303 2,717,448 Total commercial 2,115,523 1,284,235 1,142,464 995,008 761,286 1,725,540 4,479,513 2,896 12,506,465 Commercial real estate: Pass 717,400 711,231 871,283 403,115 279,058 664,684 117,847 31 3,764,649 Special Mention — — — 6,660 10,898 9,244 — — 26,802 Accruing Substandard — — — 13,352 4,480 7,780 — — 25,612 Nonaccrual — — 8,076 — — 6,186 — — 14,262 Total commercial real estate 717,400 711,231 879,359 423,127 294,436 687,894 117,847 31 3,831,325 Origination Year 2021 2020 2019 2018 2017 Prior Revolving Loans Revolving Loans Converted to Term Loans Total Paycheck protection program: Pass 237,357 38,984 — — — — — — 276,341 Total paycheck protection program 237,357 38,984 — — — — — — 276,341 Loans to individuals: Residential mortgage Pass 386,092 452,537 84,001 60,390 68,150 295,632 320,638 21,463 1,688,903 Special Mention — — 156 — 19 411 282 159 1,027 Accruing Substandard 98 — — — 127 41 400 — 666 Nonaccrual 1,516 1,809 383 1,968 629 22,289 2,177 803 31,574 Total residential mortgage 387,706 454,346 84,540 62,358 68,925 318,373 323,497 22,425 1,722,170 Residential mortgage guaranteed by U.S. government agencies Pass 699 11,380 20,650 27,970 32,742 246,871 — — 340,312 Nonaccrual — — 1,259 821 635 11,146 — — 13,861 Total residential mortgage guaranteed by U.S. government agencies 699 11,380 21,909 28,791 33,377 258,017 — — 354,173 Personal: Pass 218,960 180,577 177,389 70,249 92,592 135,041 638,713 728 1,514,249 Special Mention — 9 34 3 — 47 — — 93 Accruing Substandard 435 5 165 — — 1 — — 606 Nonaccrual 110 14 10 24 35 40 25 — 258 Total personal 219,505 180,605 177,598 70,276 92,627 135,129 638,738 728 1,515,206 Total loans to individuals 607,910 646,331 284,047 161,425 194,929 711,519 962,235 23,153 3,591,549 Total loans $ 3,678,190 $ 2,680,781 $ 2,305,870 $ 1,579,560 $ 1,250,651 $ 3,124,953 $ 5,559,595 $ 26,080 $ 20,205,680 The following table summarizes the Company's loan portfolio at December 31, 2020 by the risk grade categories and vintage (in thousands): Origination Year 2020 2019 2018 2017 2016 Prior Revolving Loans Revolving Loans Converted to Term Loans Total Commercial: Energy Pass $ 112,614 $ 51,863 $ 89,346 $ 7,178 $ 1,148 $ 7,956 $ 2,548,663 $ — $ 2,818,768 Special Mention — — — — — — 202,590 — 202,590 Accruing Substandard 24,000 1,363 1,453 — 12,667 — 283,294 — 322,777 Nonaccrual 21,076 2,607 — — — 21,064 80,312 — 125,059 Total energy 157,690 55,833 90,799 7,178 13,815 29,020 3,114,859 — 3,469,194 Healthcare Pass 536,745 615,221 638,302 422,834 234,399 658,286 147,132 — 3,252,919 Special Mention — 27,500 — — — 8,282 5 — 35,787 Accruing Substandard — — 1,191 929 132 11,387 — — 13,639 Nonaccrual — 18 183 — — 2,935 509 — 3,645 Total healthcare 536,745 642,739 639,676 423,763 234,531 680,890 147,646 — 3,305,990 Services Pass 534,853 436,384 372,867 307,374 373,785 683,936 665,491 682 3,375,372 Special Mention 150 9,057 389 291 2,038 2,000 3,063 — 16,988 Accruing Substandard 429 6,380 26,008 6,027 5,030 7,954 38,797 — 90,625 Nonaccrual 4,833 448 — 12,590 1,049 6,138 540 — 25,598 Total services 540,265 452,269 399,264 326,282 381,902 700,028 707,891 682 3,508,583 General business Pass 419,756 394,985 310,273 236,222 103,987 186,600 1,055,878 2,316 2,710,017 Special Mention 197 4,519 9,713 7,803 2,511 3,159 2,483 19 30,404 Accruing Substandard 1,432 3,069 6,694 10,935 10,042 3,729 4,449 140 40,490 Nonaccrual 1,675 3,728 4,863 1,436 530 107 477 41 12,857 Total general business 423,060 406,301 331,543 256,396 117,070 193,595 1,063,287 2,516 2,793,768 Total commercial 1,657,760 1,557,142 1,461,282 1,013,619 747,318 1,603,533 5,033,683 3,198 13,077,535 Commercial real estate: Pass 725,577 1,211,338 954,226 489,193 314,899 722,475 223,131 38 4,640,877 Special Mention — — 259 12,311 2,725 5,831 — — 21,126 Accruing Substandard — — — 4,410 — 4,852 27 — 9,289 Nonaccrual — 8,300 — 232 7,468 11,246 — — 27,246 Total commercial real estate 725,577 1,219,638 954,485 506,146 325,092 744,404 223,158 38 4,698,538 Origination Year 2020 2019 2018 2017 2016 Prior Revolving Loans Revolving Loans Converted to Term Loans Total Paycheck protection program: Pass 1,682,310 — — — — — — — 1,682,310 Total paycheck protection program 1,682,310 — — — — — — — 1,682,310 Loans to individuals: Residential mortgage Pass 564,325 149,832 120,875 124,930 158,801 348,292 335,259 24,553 1,826,867 Special Mention 33 11 2,094 — 59 318 950 10 3,475 Accruing Substandard — — 51 — — 34 272 76 433 Nonaccrual 648 104 1,658 784 2,010 22,415 3,835 774 32,228 Total residential mortgage 565,006 149,947 124,678 125,714 160,870 371,059 340,316 25,413 1,863,003 Residential mortgage guaranteed by U.S. government agencies Pass 4,859 33,880 34,464 43,099 58,264 226,380 — — 400,946 Nonaccrual — — 545 — 309 6,887 — — 7,741 Total residential mortgage guaranteed by U.S. government agencies 4,859 33,880 35,009 43,099 58,573 233,267 — — 408,687 Personal: Pass 219,873 200,580 76,246 100,229 64,104 102,126 510,571 1,510 1,275,239 Special Mention 39 55 66 — 469 31 965 — 1,625 Accruing Substandard 11 214 10 — — — 29 — 264 Nonaccrual 28 17 57 73 50 49 45 — 319 Total personal 219,951 200,866 76,379 100,302 64,623 102,206 511,610 1,510 1,277,447 Total loans to individuals 789,816 384,693 236,066 269,115 284,066 706,532 851,926 26,923 3,549,137 Total loans $ 4,855,463 $ 3,161,473 $ 2,651,833 $ 1,788,880 $ 1,356,476 $ 3,054,469 $ 6,108,767 $ 30,159 $ 23,007,520 Nonaccruing Loans A summary of nonaccruing loans as of December 31, 2021 follows (in thousands): Total With No With Allowance Related Allowance Commercial: Energy $ 31,091 $ 31,091 $ — $ — Healthcare 15,762 9,679 6,083 53 Services 17,170 13,686 3,484 2,584 General business 10,081 7,690 2,391 1,357 Total commercial 74,104 62,146 11,958 3,994 Commercial real estate 14,262 6,186 8,076 2,349 Loans to individuals: Residential mortgage 31,574 31,574 — — Residential mortgage guaranteed by U.S. government agencies 13,861 13,861 — — Personal 258 258 — — Total loans to individuals 45,693 45,693 — — Total $ 134,059 $ 114,025 $ 20,034 $ 6,343 A summary of nonaccruing loans as of December 31, 2020 follows (in thousands): Total With No With Allowance Related Allowance Commercial: Energy $ 125,059 $ 76,633 $ 48,426 $ 16,478 Healthcare 3,645 3,645 — — Services 25,598 20,810 4,788 2,574 General business 12,857 12,857 — — Total commercial 167,159 113,945 53,214 19,052 Commercial real estate 27,246 13,645 13,601 3,389 Loans to individuals: Residential mortgage 32,228 32,228 — — Residential mortgage guaranteed by U.S. government agencies 7,741 7,741 — — Personal 319 319 — — Total loans to individuals 40,288 40,288 — — Total $ 234,693 $ 167,878 $ 66,815 $ 22,441 Troubled Debt Restructurings At December 31, 2021 the Company has $273 million in troubled debt restructurings (TDRs), of which $211 million are accruing residential mortgage loans guaranteed by U.S. government agencies. Of the approximately $141 million TDRs that are performing in accordance with the modified terms, $97 million are government guaranteed loans. The loans designated as TDRs had $994 thousand in charge offs during the year ended December 31, 2021. At December 31, 2020, TDRs totaled $187 million, of which $152 million were accruing residential mortgage loans guaranteed by U.S. government agencies. Approximately $95 million of TDRs were performing. The loans designated as TDRs had $20.9 million in charge offs during the year ended December 31, 2020. TDRs generally consist of interest rate concessions, payment stream concessions or a combination of concessions to distressed borrowers. During the year ended December 31, 2021, $121 million of loans were restructured. During the year ended December 31, 2020, $83 million of loans were restructured. Past Due Loans Past due status for all loan classes is based on the actual number of days since the last payment was due according to the contractual terms of the loans, as modified for short-term payment deferral forbearance. A summary of loans currently performing and past due as of December 31, 2021 is as follows (in thousands): Past Due Current 30 to 59 60 to 89 90 Days Total Past Due 90 Days or More and Accruing Commercial: Energy $ 3,002,623 $ 545 3,716 $ — $ 3,006,884 $ — Healthcare 3,412,072 2,359 — 509 3,414,940 — Services 3,352,639 920 4,620 9,014 3,367,193 — General business 2,705,596 6,080 997 4,775 2,717,448 199 Total commercial 12,472,930 9,904 9,333 14,298 12,506,465 199 Commercial real estate 3,827,962 — 206 3,157 3,831,325 — Paycheck protection program 276,341 — — — 276,341 74 Loans to individuals Permanent mortgage 1,707,654 6,263 1,556 6,697 1,722,170 — Permanent mortgages guaranteed by U.S. government agencies 181,022 26,869 16,751 129,531 354,173 118,819 Personal 1,514,938 66 24 178 1,515,206 40 Total loans to individuals 3,403,614 33,198 18,331 136,406 3,591,549 118,859 Total $ 19,980,847 $ 43,102 $ 27,870 $ 153,861 $ 20,205,680 $ 119,132 A summary of loans currently performing and past due as of December 31, 2020 is as follows (in thousands): Past Due Current 30 to 59 60 to 89 90 Days Total Past Due 90 Days or More and Accruing Commercial: Energy $ 3,410,995 $ 12,735 4,050 $ 41,414 $ 3,469,194 $ — Healthcare 3,302,345 — — 3,645 3,305,990 — Services 3,489,423 3,278 177 15,705 3,508,583 326 General business 2,776,038 1,206 6,277 10,247 2,793,768 4,495 Total commercial 12,978,801 17,219 10,504 71,011 13,077,535 4,821 Commercial real estate 4,672,279 276 5,310 20,673 4,698,538 5,126 Paycheck protection program 1,682,310 — — — 1,682,310 — Loans to individuals Permanent mortgage 1,849,304 5,812 837 7,050 1,863,003 181 Permanent mortgages guaranteed by U.S. government agencies 262,102 41,389 22,041 83,155 408,687 78,349 Personal 1,273,702 3,317 90 338 1,277,447 241 Total loans to individuals 3,385,108 50,518 22,968 90,543 3,549,137 78,771 Total $ 22,718,498 $ 68,013 $ 38,782 $ 182,227 $ 23,007,520 $ 88,718 Following is disclosure of loans and the combined allowance for loan losses and accrual for off-balance sheet credit losses under the previous incurred loss model. The activity in the allowance for loan losses and the allowance for off-balance sheet credit losses related to loan commitments and standby letters of credit is for the year ended December 31, 2019 summarized as follows (in thousands): Commercial Commercial Real Estate Residential Mortgage Personal Nonspecific Allowance Total Allowance for loan losses: Beginning balance $ 102,226 $ 60,026 $ 17,964 $ 9,473 $ 17,768 $ 207,457 Provision for loan losses 57,125 (12,046) (3,838) 3,537 (573) 44,205 Loans charged off (43,185) (1,161) (288) (6,343) — (50,977) Recoveries 2,021 4,986 562 2,505 — 10,074 Ending balance $ 118,187 $ 51,805 $ 14,400 $ 9,172 $ 17,195 $ 210,759 Allowance for off-balance sheet credit losses: Beginning balance 1,655 52 52 31 — 1,790 Provision for off-balance sheet credit losses (221) 55 (8) (31) — (205) Ending balance $ 1,434 $ 107 $ 44 $ — $ — $ 1,585 Total provision for credit losses $ 56,904 $ (11,991) $ (3,846) $ 3,506 $ (573) $ 44,000

Premises and Equipment and Leas

Premises and Equipment and Leases	12 Months Ended
	Dec. 31, 2021
Property, Plant and Equipment [Abstract]
Premises and Equipment Disclosure [Text Block]	Premises and Equipment and Leases Premises and equipment at December 31 are summarized as follows (in thousands): December 31, 2021 2020 Land $ 69,776 $ 69,776 Buildings and improvements 472,450 440,528 Software and related integration 159,063 120,444 Furniture and equipment 186,092 165,344 Construction in progress 36,917 46,949 Premises and equipment 924,298 843,041 Less accumulated depreciation 350,150 291,733 Premises and equipment, net of accumulated depreciation $ 574,148 $ 551,308 Depreciation expense of premises and equipment was $63.4 million, $54.3 million and $51.6 million for the years ended December 31, 2021, 2020 and 2019, respectively. Premises and equipment included right-of-use assets for leased office space and facilities. Leases are at market rates at inception and may contain escalations based on consumer price index or similar benchmarks and options to renew at then market rates. Right-of-use assets of $181 million at December 31, 2021 and $166 million at December 31, 2020 are included in buildings and improvements and related right-of-use liabilities are included in other liabilities. At December 31, 2021, the weighted-average remaining lease term was 10.9 years and the weighted average discount rate on operating leases was 2.9%. At December 31, 2021, un-discounted operating lease liabilities are scheduled to mature as follows: $23.8 million in 2022, $24.7 million in 2023, $24.3 million in 2024, $23.6 million in 2025, $22.6 million in 2026 and $130 million thereafter. Total lease expense for BOK Financial was $35.8 million in 2021, $42.0 million in 2020 and $43.0 million in 2019. Rent expense and right of use asset amortization recognized as occupancy and equipment expense was $23.4 million in 2021, $25.0 million in 2020 and $24.2 million in 2019. Operating cash flows from operating leases were $25.3 million and $25.6 million for the years ended December 31, 2021 and December 31, 2020, respectively. Operating expenses related to leased assets and short term lease costs totaled $11.5 million, $13.4 million and $12.6 million for the years ended December 31, 2021, 2020 and 2019, respectively. BOKF, NA is obligated under a long-term lease for its bank premises in downtown Tulsa. The original lease dated November 1, 1976 was renegotiated on July 1, 2019. The new lease will terminate on December 31, 2034. The Company has the option to renew for an additional 10 years. Premises leases may include options to renew at then current market rates and may include escalation provisions based upon changes in consumer price index or similar benchmarks.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets [Text Block]	Goodwill and Intangible Assets The following table presents the original cost and accumulated amortization of intangible assets (in thousands): Dec. 31, 2021 2020 Core deposit premiums $ 103,200 $ 103,200 Less accumulated amortization 44,149 32,256 Net core deposit premiums 59,051 70,944 Other identifiable intangible assets 78,154 82,731 Less accumulated amortization 45,427 40,239 Net other identifiable intangible assets 32,727 42,492 Total intangible assets, net $ 91,778 $ 113,436 Expected amortization expense for intangible assets that will continue to be amortized (in thousands): Core Other Total 2022 $ 10,981 $ 4,665 $ 15,646 2023 10,145 3,625 13,770 2024 9,379 2,611 11,990 2025 8,675 2,201 10,876 2026 7,986 1,828 9,814 Thereafter 11,885 17,797 29,682 $ 59,051 $ 32,727 $ 91,778 The changes in the carrying value of goodwill by operating segment are as follows (in thousands): Commercial Banking Consumer Banking Wealth Funds Management and Other Total Balance, December 31, 2019 $ 913,931 $ 43,458 $ 90,702 $ — $ 1,048,091 Balance, December 31, 2020 913,931 43,458 90,702 — 1,048,091 Sale of consolidated merchant banking investment during 2021 (3,342) — — — (3,342) Balance, December 31, 2021 $ 910,589 $ 43,458 $ 90,702 $ — $ 1,044,749 At October 1, 2021, the Company performed a qualitative impairment assessment of goodwill based on factors including, but not limited to, general economic conditions, financial services industry considerations, regional economic conditions, global health concerns and related medical developments, general BOKF Financial performance and reporting unit performance. No impairment was indicated for any reporting unit.

Deposits

Deposits	12 Months Ended
	Dec. 31, 2021
Deposits [Abstract]
Deposits [Text Block]	Interest expense on deposits is summarized as follows (in thousands): Year Ended December 31, 2021 2020 2019 Transaction deposits $ 21,961 $ 60,424 $ 132,854 Savings 374 385 677 Time: Certificates of deposits under $100,000 2,961 6,741 8,299 Certificates of deposits $100,000 and over 4,719 18,270 29,288 Other time deposits 3,469 4,176 4,420 Total time 11,149 29,187 42,007 Total $ 33,484 $ 89,996 $ 175,538 The aggregate amounts of time deposits in denominations of $250,000 or more at December 31, 2021 and 2020 were $828 million and $815 million, respectively. Time deposit maturities are as follows: 2022 – $1.3 billion, 2023 – $156 million, 2024 – $54 million, 2025 – $39 million, 2026 – $82 million and $25 million thereafter. The aggregate amount of overdrawn customer transaction deposits that have been reclassified as loan balances was $3.4 million at December 31, 2021 and $3.1 million at December 31, 2020.

Other Borrowed Funds

Other Borrowed Funds	12 Months Ended
	Dec. 31, 2021
Debt Disclosure [Abstract]
Other Borrowed Funds [Text Block]	Other Borrowed Funds Information relating to other borrowings is summarized as follows (dollars in thousands): As of Year Ended December 31, 2021 December 31, 2021 Balance Rate Average Balance Rate Maximum Funds purchased $ 199,513 0.05 % $ 543,183 0.46 % $ 542,465 Repurchase agreements 2,126,936 0.08 % 1,695,519 0.33 % 2,920,728 Other borrowings: Federal Home Loan Bank advances — — % 1,679,315 0.27 % 2,600,000 GNMA repurchase liability 7,420 4.36 % 11,956 4.06 % 23,856 Paycheck protection program liquidity facility — — % 879,145 0.35 % 1,662,598 Other 29,333 3.23 % 29,445 4.18 % 31,875 Total other borrowings 36,753 2,599,861 0.38 % Subordinated debentures 1 131,226 3.95 % 224,058 4.70 % 276,049 Total other borrowed funds $ 2,494,428 $ 5,062,621 0.56 % As of Year Ended December 31, 2020 December 31, 2020 Balance Rate Average Balance Rate Maximum Funds purchased $ 769,365 0.05 % $ 2,045,795 0.58 % $ 3,311,938 Repurchase agreements 893,021 0.09 % 1,589,746 0.24 % 3,230,097 Other borrowings: Federal Home Loan Bank advances 200,000 0.29 % 3,393,989 1.00 % 7,500,000 GNMA repurchase liability 19,500 4.35 % 42,771 4.18 % 126,569 Federal Reserve Bank advances — — % 42,464 0.26 % — Paycheck protection program liquidity facility 1,635,963 0.35 % 1,152,073 0.35 % 2,013,414 Other 27,507 5.24 % 28,156 5.12 % 49,376 Total other borrowings 1,882,970 4,659,453 0.88 % Subordinated debentures 1 276,005 4.72 % 275,965 5.05 % 276,005 Total other borrowed funds $ 3,821,361 $ 8,570,959 0.82 % As of Year Ended December 31, 2019 December 31, 2019 Balance Rate Average Balance Rate Maximum Funds purchased $ 3,390,528 1.53 % $ 2,438,376 2.08 % $ 3,390,528 Repurchase agreements 427,822 0.50 % 399,785 0.57 % 427,822 Other borrowings: Federal Home Loan Bank advances 4,500,000 1.79 % 7,122,466 2.44 % 8,000,000 GNMA repurchase liability 15,417 4.32 % 13,746 4.47 % 19,581 Other 11,638 5.09 % 11,144 5.30 % 34,676 Total other borrowings 4,527,055 7,147,356 2.45 % Subordinated debentures 1 275,923 5.15 % 276,075 5.47 % 275,923 Total other borrowed funds $ 8,621,328 $ 10,261,592 2.37 % 1 Parent Company only. Aggregate annual principal repayments at December 31, 2021 are as follows (in thousands): 2022 $ 2,343,341 2023 3,378 2024 3,498 2025 3,622 2026 3,752 Thereafter 136,837 Total $ 2,494,428 Funds purchased are unsecured and generally mature within one day to ninety days from the transaction date. Securities repurchase agreements are recorded as secured borrowings that generally mature within ninety days and are secured by certain available for sale securities. Additional information relating to securities sold under agreements to repurchase and related liabilities at December 31, 2021 and 2020 is as follows (dollars in thousands): December 31, 2021 Amortized Fair Repurchase Security Sold/Maturity Cost Value Liability 1 Rate U.S. government agency mortgage-backed securities: Overnight 1 $ 907,154 $ 902,507 $ 884,936 0.08 % Less than 30 days 2 N/A 1,242,000 1,242,000 1.50 % Total Agency Securities $ 907,154 $ 2,144,507 $ 2,126,936 1.58 % December 31, 2020 Amortized Fair Repurchase Security Sold/Maturity Cost Value Liability 1 Rate U.S. government agency mortgage-backed securities: Overnight 1 $ 893,069 $ 910,885 $ 893,021 0.09 % Less than 30 days — — — — % Total Agency Securities $ 893,069 $ 910,885 $ 893,021 0.09 % 1 BOK Financial maintains control over the securities underlying overnight repurchase agreements and generally transfers control over securities underlying longer-term dealer repurchase agreements to the respective counterparty. 2 Trading position. Borrowings from the Federal Home Loan Banks are used for funding purposes. In accordance with policies of the Federal Home Loan Banks, BOK Financial has granted a blanket pledge of eligible assets (generally unencumbered U.S. Treasury and residential mortgage-backed securities, 1-4 family loans and multifamily loans) as collateral for these advances. The Federal Home Loan Banks have issued letters of credit totaling $500 million to secure BOK Financial’s obligations to depositors of public funds. The unused credit available to BOK Financial at December 31, 2021 pursuant to the Federal Home Loan Bank’s collateral policies is $5.9 billion. In 2016, BOK Financial issued $150 million of subordinated debt set to mature on June 30, 2056. This debt bore an interest rate of 5.375%, payable quarterly. On August 23, 2021, BOK Financial exercised its option to redeem the debt at the principal amount plus accrued interest and realized a $5.2 million loss on extinguishment of debt. As a result of the acquisition of CoBiz Financial, we obtained $60 million of subordinated debt issued in June 2015 that will mature on June 25, 2030. This debt bears interest at the rate of 5.625% through June 2025 and thereafter, the notes will bear interest at an annual floating rate equal to three-month LIBOR plus 3.17%. The debt contains a call option that allows for repayment prior to contractual maturity. The call option is available on June 25, 2025 and quarterly thereafter at 100% of the principal amount. Also through CoBiz Financial, we acquired junior subordinated debentures split across three issuance tranches. Junior subordinated debentures of $21 million will mature September 17, 2033 and bear an interest rate of three-month LIBOR plus 2.95% that resets quarterly. Junior subordinated debentures of $31 million will mature on July 23, 2034 and bear an interest rate of three-month LIBOR plus 2.60% that resets quarterly. Junior subordinated debentures of $20 million will mature on September 30, 2035 and bear an interest rate of three-month LIBOR plus 1.45% that resets quarterly. The junior subordinated debentures are subject to early redemption prior to maturity. BOK Financial Securities, Inc. may borrow funds from Pershing, LLC ("Pershing"), a clearing broker/dealer and a wholly owned subsidiary of Bank of New York Mellon, for the purposes of financing securities purchases or to facilitate funding of investment banking activities, on terms to be negotiated at the time of the borrowing. BOK Financial Securities, Inc. had no borrowings outstanding at December 31, 2021 and December 31, 2020. The Company has a liability related to the repurchase of certain delinquent residential mortgage loans previously sold into GNMA mortgage pools. Interest is payable at rates contractually due to investors.

Federal and State Income Taxes

Federal and State Income Taxes	12 Months Ended
	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Federal and State Income Taxes [Text Block]	Federal and State Income Taxes Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. Significant components of deferred tax assets and liabilities are as follows (in thousands): December 31, 2021 2020 Deferred tax assets: Credit loss reserves $ 67,339 $ 101,265 Lease liability 48,457 44,794 Deferred compensation 33,945 29,504 Unearned fees 11,368 14,584 Purchased loan discount 7,498 11,537 Share-based compensation 5,989 6,525 Valuation adjustments 1,883 3,834 Other 28,958 29,963 Total deferred tax assets 205,437 242,006 Deferred tax liabilities: Available for sale securities mark to market 21,841 105,769 Right-of-use asset 41,291 38,635 Mortgage servicing rights 31,703 24,182 Acquired identifiable intangible 14,307 18,138 Depreciation 10,939 13,754 Lease financing 11,120 11,828 Other 39,698 39,210 Total deferred tax liabilities 170,899 251,516 Net deferred tax assets (liabilities) $ 34,538 $ (9,510) No valuation allowance was necessary on deferred tax assets as of December 31, 2021 and 2020. The significant components of the provision for income taxes attributable to continuing operations for BOK Financial are shown below (in thousands): Year Ended December 31, 2021 2020 2019 Current income tax expense: Federal $ 121,196 $ 173,888 $ 110,887 State 21,065 29,889 15,088 Total current income tax expense 142,261 203,777 125,975 Deferred income tax expense (benefit): Federal 29,777 (65,989) 3,416 State 7,737 (8,995) 792 Total deferred income tax expense (benefit) 37,514 (74,984) 4,208 Total income tax expense $ 179,775 $ 128,793 $ 130,183 The reconciliations of income attributable to continuing operations at the U.S. federal statutory tax rate to income tax expense are as follows (in thousands): Year Ended December 31, 2021 2020 2019 Amount: Federal statutory tax $ 167,181 $ 118,412 $ 132,482 Tax exempt revenue (6,084) (7,035) (12,227) Effect of state income taxes, net of federal benefit 22,489 14,251 12,715 Utilization of tax credits, net of proportional amortization of low-income housing limited partnership investments (8,801) (6,994) (5,127) Other, net 4,990 10,159 2,340 Total income tax expense $ 179,775 $ 128,793 $ 130,183 Year Ended December 31, 2021 2020 2019 Percent of pretax income: Federal statutory tax 21.0 % 21.0 % 21.0 % Tax exempt revenue (0.7) (1.2) (1.9) Effect of state income taxes, net of federal benefit 2.8 2.5 2.0 Utilization of tax credits, net of proportional amortization of low-income housing limited partnership investments (1.1) (1.2) (0.8) Other, net 0.6 1.7 0.3 Total 22.6 % 22.8 % 20.6 % A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands): 2021 2020 2019 Balance as of January 1 $ 22,902 $ 20,465 $ 18,869 Additions for tax for current year positions 3,961 6,384 5,649 Settlements during the period (1,754) — — Lapses of applicable statute of limitations (4,017) (3,947) (4,053) Balance as of December 31 $ 21,092 $ 22,902 $ 20,465 Of the above unrecognized tax benefits, $16.4 million, if recognized, would have affected the effective tax rate.

Employee Benefits

Employee Benefits	12 Months Ended
	Dec. 31, 2021
Retirement Benefits [Abstract]
Employee Benefits [Text Block]	Employee Benefits BOK Financial sponsors a defined benefit cash balance Pension Plan for all employees who satisfy certain age and service requirements. Pension Plan benefits were curtailed as of April 1, 2006. No participants may be added to the plan and no additional service benefits will be accrued. Interest continues to accrue on employees' account balances at a variable rate tied to the five-year trailing average of five-year U.S. Treasury securities plus 1.5%. The rate has a floor of 3.0% and a ceiling of 5.0%. The 2021 quarterly variable rates ranged from 3.13% to 3.22%. The projected benefit obligation and fair value of plan assets, respectively, were $20 million and $39 million at December 31, 2021 and $24 million and $38 million at December 31, 2020. The net periodic benefit credit was $2.2 million for December 31, 2021, $1.3 million for December 31, 2020 and $815 thousand for December 31, 2019, and is included in Personnel expense in the Consolidated Statements of Earnings. Total expected future benefit payments related to the Pension Plan were $22.4 million at December 31, 2021. The following table presents the weighted-average assumptions used in the measurement of the Company's net periodic benefit cost as of December 31: 2021 2020 Discount rate 1.73 % 2.69 % Expected return on plan assets 5.50 % 5.50 % Assets of the Pension Plan consist primarily of shares in the Cavanal Hill Active Core Fund. The stated objective of this fund is to provide an attractive total return with a well-balanced mix of equities and bonds. The typical portfolio mix is approximately 60% equities and 40% bonds. The net asset value of shares in the Cavanal Hill Funds is reported daily based on market quotations for the Fund’s securities. Management considers the Fund's recent and long-term performance as indicators when setting the expected return on plan assets. No minimum contribution was required for 2021, 2020 or 2019. On November 2, 2021, the Board of Directors approved a plan to terminate the Pension Plan and management is currently in the process of executing the termination strategy. Employee contributions to the Thrift Plan are eligible for Company matching equal to 6% of base compensation, as defined in the plan. The Company-provided matching contribution rates range from 50% for employees with less than 4 years of service to 200% for employees with 15 or more years of service. Additionally, a maximum Company-provided, non-elective annual contribution of up to $750 per participant is provided for employees whose annual base compensation is less than $40,000. Participants may direct investments in their accounts to a variety of options, including a BOK Financial common stock fund and Cavanal Hill funds. Employer contributions, which are invested in accordance with the participant’s investment options, vest over five years. Thrift Plan expenses were $30.5 million for 2021, $29.9 million for 2020 and $27.6 million for 2019.

Share-Based Compensation Plans

Share-Based Compensation Plans	12 Months Ended
	Dec. 31, 2021
Share-based Payment Arrangement [Abstract]
Share-Based Compensation Plans [Text Block]	Share-Based Compensation Plans The shareholders and Board of Directors of BOK Financial have approved various share-based compensation plans. An independent compensation committee of the Board of Directors determines the number of awards granted to the Chief Executive Officer and other senior executives. Share-based compensation is granted to other officers and employees as determined by the Chief Executive Officer. No options have been awarded since 2013. At December 31, 2021, the number of options outstanding and the weighted average remaining contractual life of options outstanding was not significant. The aggregate intrinsic value of options exercised was $496 thousand for 2021, $318 thousand for 2020 and $761 thousand for 2019. The Company also awards restricted stock to certain officers and employees and restricted stock units ("RSUs") to certain executives, (collectively "non-vested shares"). Vesting of all non-vested shares is subject to service requirements. Additionally, vesting of certain non-vested shares is subject to performance criteria based on changes in the Company's earnings per share relative to defined peers. The following represents a summary of the non-vested shares for the three years ended December 31, 2021 (in thousands): Restricted Stock Restricted Stock Units Shares Weighted Units Weighted Non-vested at January 1, 2019 527,607 — Granted 145,724 $ 76.74 46,689 $ 87.40 Vested (114,201) 61.28 — — Forfeited (131,952) 83.69 — — Non-vested at December 31, 2019 427,178 46,689 Granted 236,750 $ 83.49 22,980 $ 77.36 Vested (225,527) 83.50 — — Forfeited (18,167) 83.10 — — Non-vested at December 31, 2020 420,234 69,669 Granted 247,917 $ 73.01 17,570 $ 88.25 Vested (166,965) 94.96 — — Forfeited (11,632) 75.83 — — Non-vested at December 31, 2021 489,554 87,239 Compensation expense recognized on non-vested shares totaled $9.3 million for 2021, $16.0 million for 2020 and $15.1 million for 2019. Unrecognized compensation cost of non-vested shares totaled $12.6 million at December 31, 2021. We expect to recognize compensation expense of $8.3 million in 2022, $4.1 million in 2023, and $224 thousand in 2024.

Related Parties

Related Parties	12 Months Ended
	Dec. 31, 2021
Related Party Transactions [Abstract]
Related Parties [Text Block]	Related Parties In compliance with applicable banking regulations, the Company may extend credit to certain executive officers, directors, principal shareholders and their affiliates (collectively referred to as “related parties”) in the ordinary course of business. The Company’s loans to related parties do not involve more than the normal credit risk. Activity in loans to related parties is summarized as follows (in thousands): Year Ended December 31, 2021 2020 Beginning balance $ 92,940 $ 75,189 Advances 588,252 498,425 Payments (583,040) (484,958) Adjustments 1 (2,933) 4,284 Ending balance $ 95,219 $ 92,940 1 Adjustments generally consist of changes in status as a related party. As defined by banking regulations, loan commitments and equity investments from the subsidiary banks to a single affiliate may not exceed 10% of unimpaired capital and surplus while loan commitments and equity investments to all affiliates may not exceed 20% of unimpaired capital and surplus. All loans to affiliates must be fully secured by eligible collateral. At December 31, 2021, loan commitments and equity investments were limited to $416 million to a single affiliate and $833 million to all affiliates. The largest loan commitment and equity investment to a single affiliate was $264 million and the aggregate loan commitments and equity investments to all affiliates were $324 million. The largest outstanding amount to a single affiliate at December 31, 2021 was $4.0 million and the total outstanding amounts to all affiliates were $5.0 million. At December 31, 2020, total loan commitments and equity investments to all affiliates were $324 million and the total outstanding amounts to all affiliates were $5.3 million. Certain related parties are customers of the Company for services other than loans, including consumer banking, corporate banking, risk management, wealth management, brokerage and trading, or fiduciary/trust services. The Company engages in transactions with related parties in the ordinary course of business in compliance with applicable regulations. QuikTrip Corporation has entered into a fee sharing agreement with TransFund, BOKF’s electronic funds transfer network (“TransFund”), respecting transactions completed at TransFund automated teller machines placed in QuikTrip locations. Pursuant to this agreement, BOKF paid QuikTrip approximately $10.4 million in 2021, $10.0 million in 2020 and $10.0 million in 2019. A BOK Financial director is Chief Executive Officer, Chairman, and a significant shareholder of QuikTrip Corporation. Cavanal Hill Investment Management, Inc., a wholly-owned subsidiary of BOKF, NA, is the administrator to and investment advisor for the Cavanal Hill Funds (the "Funds"), a diversified, open-ended investment company established as a business trust under the Investment Company Act of 1940 (the "1940 Act"). BOKF, NA is custodian and Cavanal Hill Distributors, Inc. is distributor for the Funds. The Funds’ products are offered to customers, employee benefit plans, trusts and the general public in the ordinary course of business. Approximately 81% of the Funds’ assets of $4.0 billion are held for the Company's clients. A Company executive officer serves on the Funds' board of trustees and officers of BOKF, NA serve as president and secretary of the Funds. A majority of the members of the Funds’ board of trustees are, however, independent of the Company and the Funds are managed by its board of trustees.

Commitments and Contingent Liab

Commitments and Contingent Liabilities	12 Months Ended
	Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingent Liabilities [Text Block]	Commitments and Contingent Liabilities Litigation Contingencies As a member of Visa, BOK Financial is obligated for a proportionate share of certain covered litigation losses incurred by Visa under a retrospective responsibility plan. A contingent liability was recognized for the Company’s share of Visa’s covered litigation liabilities. Visa funded an escrow account to cover litigation claims, including covered litigation losses under the retrospective responsibility plan, with proceeds from its initial public offering in 2008 and from available cash. BOK Financial currently owns 252,533 Visa Class B shares which are convertible into 408,624 shares of Visa Class A shares after the final settlement of all covered litigation. Class B shares may be diluted in the future if the escrow fund is not adequate to cover future covered litigation costs. No value has been currently assigned to the Class B shares. On June 24, 2015, BOKF, NA received a complaint that an employee had colluded with a bond issuer and an individual in misusing revenues pledged to municipal bonds for which BOKF, NA served as trustee under the bond indenture. The Company conducted an investigation and concluded that employees in one of its Corporate Trust offices had, with respect to a single group of affiliated bond issuances, violated Company policies and procedures. The relationship manager was terminated. The Company reported the circumstances to, and cooperated with an investigation by, the Securities and Exchange Commission ("SEC"). On September 7, 2016, BOKF, NA agreed, and the SEC entered, a consent order finding that BOKF, NA had violated Section 17(a) of the Securities Act of 1933 and Section 10(b) of the Securities Exchange Act and requiring BOKF, NA to disgorge $1,067,721 of fees and pay a civil penalty of $600,000. BOKF, NA disgorged the fees and paid the penalty. On August 26, 2016, BOKF, NA was sued in the United States District Court for New Jersey by two bondholders in a putative class action alleging BOKF, NA participated in the fraudulent sale of securities by the principals. The action remains stayed with no current deadlines pending. On September 14, 2016, BOKF, NA was sued in the District Court of Tulsa County, Oklahoma by 19 bondholders also alleging BOKF, NA participated in the fraudulent sale of securities by the principals. The Tulsa County District Court action is pending on BOKF, NA’s motion to dismiss the plaintiff's Third Amended Petition. On December 28, 2015, in an action brought by the SEC, the New Jersey District Court entered a judgment against the principals involved in issuing the bonds. On January 8, 2020, the Court entered judgment against the principal individual and his wife for $36,805,051 in principal amount and $10,937,831 in pre-judgment interest. The SEC continues to aggressively pursue collection of the judgment. If the individual principal and his wife cannot pay the bonds, a bondholder loss could become probable. Management has been advised by counsel that BOKF, NA has valid defenses to claims of bondholders and that no loss to the Company is probable. No provision for losses has been made at this time. BOKF, NA estimates that, upon sale of all remaining collateral securing payment of the bonds, approximately $20 million will remain outstanding. A reasonable estimate cannot be made of the amount of any bondholder loss, though the amount of bondholder loss could be material to the Company in the event a loss to the Company becomes probable. On September 29, 2021, The United States Court of Appeals for the Fifth Circuit affirmed the dismissal of the previously reported putative class action in the United States District Court for the Northern District of Texas alleging an extended overdraft fee charged by BOKF, NA was interest. The dismissal by the United States District Court for New Mexico of a second putative class action in which the plaintiff made the same allegations as were made in the Texas action remains on appeal to the United States Court of Appeals for the Tenth Circuit. Management is advised by counsel that a loss is not probable and that the loss, if any, cannot be reasonably estimated. On March 7, 2020, three former employees sued BOKF, NA, the Plan Committee of the BOKF, NA 401k Plan, and Cavanal Hill Investment Management, Inc., a subsidiary of BOKF, NA, alleging that the defendants included proprietary investment products as investment options in the BOKF, NA 401k Plan, whose fees were too high and performance too low, for the purpose of earning fees. The action is brought as a putative class action on behalf of all Plan Participants. The action is pending on the defendants' motion to dismiss. Management is advised by counsel that a loss is not probable and that the loss, if any, cannot be reasonably estimated. In 2019, a limited liability partnership sued BOKF, NA in Colorado District Court alleging that the Bank breached various fiduciary duties as trustee of a trust that was a co-general partner of the partnership and claiming in excess of $60 million in damages. From 2000 to 2009, BOKF was serving as personal representative of the estate of the creator of the trust. In 2009, BOKF moved to close the probate of the estate in the Colorado Probate Court. The members of the partnership who now sue BOKF objected to the closing of the estate and made the same allegations in the 2009 probate hearing as they now make in the 2019 Colorado District Court action. In 2009, the Colorado Probate Court entered summary judgment against the beneficiaries and the estate was closed. In the 2019 action, the Colorado District Court denied BOKF’s motions for summary judgment and the matter is proceeding to trial. Management is advised by counsel that a loss is not probable and that the loss, if any, cannot be reasonably estimated. In the ordinary course of business, BOK Financial and its subsidiaries are subject to legal actions and complaints. Management believes, based upon the opinion of counsel, that the actions and liability or loss, if any, resulting from the final outcomes of the proceedings, will not have a material effect on the Company’s financial condition, results of operations or cash flows. Alternative Investment Commitments The Company sponsors a private equity fund and invests in several tax credit entities and other funds as permitted by banking regulations. Consolidation of these investments is based on the variable interest model. At December 31, 2021, the Company has $352 million in interests in various alternative investments generally consisting of unconsolidated limited partnership interests in entities for which investment return is in the form of low income housing tax credits or other investments in merchant banking activities. The investment balance also includes $106 million in unfunded commitments included in Other liabilities on the Consolidated Balance Sheets. At December 31, 2020, the Company had $290 million in interests in various alternative investments and included $94 million in unfunded commitments in Other liabilities. Other Commitments and Contingencies Cavanal Hill Funds’ assets include U.S. Treasury and government securities money market funds. Assets of these funds consist of highly-rated, short-term obligations of the U.S. Treasury and Agencies. The net asset value of units in these funds was $1.00 at December 31, 2021. An investment in these funds is not insured by the Federal Deposit Insurance Corporation or guaranteed by BOK Financial or any of its subsidiaries. BOK Financial may, but is not obligated to purchase assets from these funds to maintain the net asset value at $1.00. No assets were purchased from the funds in 2021 or 2020. The Federal Reserve Bank requires member banks to maintain certain minimum average cash balances. Member banks may satisfy reserve balance requirements through holdings of vault cash and balances maintained directly with a Federal Reserve Bank. The combined average balance of vault cash and balances held at the Federal Reserve Bank was $905 million for the year ended December 31, 2021 and $727 million for the year ended December 31, 2020.

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2021
Earnings Per Share [Abstract]
Earnings Per Share [Text Block]	Earnings Per Share The following table presents the computation of basic and diluted earnings per share (dollars in thousands, except per share data): Year Ended 2021 2020 2019 Numerator: Net income attributable to BOK Financial Corp. shareholders $ 618,121 $ 435,030 $ 500,758 Less: Earnings allocated to participating securities 4,299 2,612 3,227 Numerator for basic earnings per share – income available to common shareholders 613,822 432,418 497,531 Effect of reallocating undistributed earnings of participating securities — — — Numerator for diluted earnings per share – income available to common shareholders $ 613,822 $ 432,418 $ 497,531 Denominator: Weighted average shares outstanding 69,071,511 70,259,553 71,250,081 Less: Participating securities included in weighted average shares outstanding 479,591 418,576 462,381 Denominator for basic earnings per common share 68,591,920 69,840,977 70,787,700 Dilutive effect of employee stock compensation plans 2,402 3,195 14,912 Denominator for diluted earnings per common share 68,594,322 69,844,172 70,802,612 Basic earnings per share $ 8.95 $ 6.19 $ 7.03 Diluted earnings per share $ 8.95 $ 6.19 $ 7.03

Shareholders' Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2021
Stockholders' Equity Note [Abstract]
Shareholders' Equity [Text Block]	Shareholders Equity Preferred Stock One billion shares of preferred stock with a par value of $0.00005 per share are authorized. The Series A Preferred Stock has no voting rights except as otherwise provided by Oklahoma corporate law and may be converted into one share of Common Stock for each 36 shares of Series A Preferred Stock at the option of the holder. Dividends are cumulative at an annual rate of ten percent of the $0.06 per share liquidation preference value when declared and are payable in cash. Aggregate liquidation preference is $15 million. No Series A Preferred Stock was outstanding in 2021, 2020 or 2019. Common Stock Common stock consists of 2.5 billion authorized shares with a $0.00006 par value. Holders of common shares are entitled to one vote per share at the election of the Board of Directors and on any question arising at any shareholders’ meeting and to receive dividends when and as declared. Additionally, regulations restrict the ability of national banks and bank holding companies to pay dividends. Subsidiary Bank The amounts of dividends that BOK Financial’s subsidiary bank can declare and the amounts of loans the subsidiary bank can extend to affiliates are limited by various federal banking regulations and state corporate law. Generally, dividends declared during a calendar year are limited to net profits, as defined, for the year plus retained profits for the preceding two years. Dividends are further restricted by minimum capital requirements. Regulatory Capital BOK Financial and the subsidiary bank is subject to various capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory and additional discretionary actions by regulators that could have a material effect on BOK Financial's operations. These capital requirements include quantitative measures of assets, liabilities and certain off-balance sheet items. The capital standards are also subject to qualitative judgments by the regulators. A bank falling below the minimum capital requirements, including the capital conservation buffer, would be subject to regulatory restrictions on capital distributions (including but not limited to dividends and share repurchases) and executive bonus payments. For a banking institution to qualify as well capitalized, Common Equity Tier 1, Tier I, Total and Leverage capital ratios must be at least 6.5%, 8%, 10% and 5%, respectively. Tier I capital consists primarily of common stockholders' equity, excluding unrealized gains or losses on available for sale securities, less goodwill, core deposit premiums and certain other intangible assets. Total capital consists primarily of Tier I capital plus preferred stock, subordinated debt and allowances for credit losses, subject to certain limitations. The subsidiary bank exceeded the regulatory definition of well capitalized as of December 31, 2021 and December 31, 2020. A summary of regulatory capital minimum requirements and levels follows (dollars in thousands): Minimum Capital Requirement Capital Conservation Buffer Minimum Capital Requirement Including Capital Conservation Buffer Well Capitalized Bank Requirement December 31, 2021 December 31, 2020 Common Equity Tier 1 Capital (to Risk Weighted Assets): Consolidated 4.50% 2.50% 7.00% N/A $ 4,230,626 12.24 % $ 3,881,912 11.95 % BOKF, NA 4.50% N/A 4.50% 6.50% 3,869,454 11.27 % 3,756,950 11.66 % Tier I Capital (to Risk Weighted Assets): Consolidated 6.00% 2.50% 8.50% N/A $ 4,235,265 12.25 % $ 3,881,912 11.95 % BOKF, NA 6.00% N/A 6.00% 8.00% 3,871,457 11.28 % 3,756,950 11.66 % Total Capital (to Risk Weighted Assets): Consolidated 8.00% 2.50% 10.50% N/A $ 4,594,787 13.29 % $ 4,489,110 13.82 % BOKF, NA 8.00% N/A 8.00% 10.00% 4,164,940 12.13 % 4,153,347 12.89 % Leverage (Tier I Capital to Average Assets): Consolidated 4.00% N/A 4.00% N/A $ 4,235,265 8.55 % $ 3,881,912 8.28 % BOKF, NA 4.00% N/A 4.00% 5.00% 3,871,457 7.84 % 3,756,950 8.04 % Accumulated Other Comprehensive Income (Loss) AOCI includes unrealized gains and losses on available for sale ("AFS") securities and non-credit related unrealized losses on AFS securities for which an other-than-temporary impairment has been recorded in earnings. Unrealized losses on employee benefit plans will be reclassified into income as pension plan costs are recognized over the remaining service period of plan participants. Gains and losses in AOCI are net of deferred income taxes. A rollforward of the components of accumulated other comprehensive income (loss) is included as follows (in thousands): Unrealized Gain (Loss) on Available for Sale Securities Employee Benefit Plans Total Balance, December 31, 2018 $ (70,999) $ (1,586) $ (72,585) Net change in unrealized gain (loss) 239,017 2,030 241,047 Reclassification adjustments included in earnings: Gain on available for sale securities, net (5,597) — (5,597) Other comprehensive income (loss), before income taxes 233,420 2,030 235,450 Federal and state income tax 57,425 517 57,942 Other comprehensive income (loss), net of income taxes 175,995 1,513 177,508 Balance, December 31, 2019 104,996 (73) 104,923 Net change in unrealized gain (loss) 312,576 1,220 313,796 Reclassification adjustments included in earnings: Gain on available for sale securities, net (9,910) — (9,910) Other comprehensive income (loss), before income taxes 302,666 1,220 303,886 Federal and state income tax 72,630 311 72,941 Other comprehensive income (loss), net of income taxes 230,036 909 230,945 Balance, December 31, 2020 335,032 836 335,868 Net change in unrealized gain (loss) (343,730) 2,361 (341,369) Reclassification adjustments included in earnings: Gain on available for sale securities, net (3,704) — (3,704) Other comprehensive income (loss), before income taxes (347,434) 2,361 (345,073) Federal and state income tax (82,177) 601 (81,576) Other comprehensive income (loss), net of income taxes (265,257) 1,760 (263,497) Balance, December 31, 2021 $ 69,775 $ 2,596 $ 72,371

Reportable Segments

Reportable Segments	12 Months Ended
	Dec. 31, 2021
Segment Reporting [Abstract]
Reportable Segments [Text Block]	Reportable Segments BOK Financial operates three principal lines of business: Commercial Banking, Consumer Banking and Wealth Management. Commercial Banking includes lending, treasury and cash management services and customer risk management products to small businesses, middle market and larger commercial customers. Commercial Banking also includes the TransFund EFT network. Consumer Banking includes retail lending and deposit services, lending and deposit services to small business customers served through the consumer branch network and all mortgage banking activities. Wealth Management provides fiduciary services, private bank services, insurance and investment advisory services in all markets. Wealth Management also underwrites state and municipal securities and engages in brokerage and trading activities. In addition to its lines of business, BOK Financial has a Funds Management unit. The primary purpose of this unit is to manage overall liquidity needs and interest rate risk. Each line of business borrows funds from and provides funds to the Funds Management unit as needed to support their operations. Operating results for Funds Management and Other include the effect of interest rate risk positions and risk management activities, securities gains and losses including impairment charges, the provision for credit losses in excess of net loans charged off, tax planning strategies and certain executive compensation costs that are not attributed to the lines of business. BOK Financial allocates resources and evaluates performance of its lines of business after allocation of funds and capital costs. Credit costs are attributed to the lines of business based on net loans charged off or recovered. In addition, we measure the performance of our business lines after allocation of certain indirect expenses and taxes on statutory rates. The allocation for the prior comparable periods have been revised on a comparable basis. The cost of funds borrowed from the Funds Management unit by the operating lines of business is transfer priced at rates that approximate market rates for funds with similar duration. Market rates are generally based on the applicable wholesale borrowing rates or interest rate swap rates, adjusted for prepayment risk. This method of transfer-pricing funds that support assets of the operating lines of business tends to insulate them from interest rate risk. The value of funds provided by the operating lines of business to the Funds Management unit is based on rates which approximate the wholesale market rates for funds with similar duration and re-pricing characteristics. Market rates are generally based on a proxy of wholesale borrowing rates or interest rate swap rates. The funds credit formula applied to deposit products with indeterminate maturities is established based on their re-pricing characteristics reflected in a combination of the short-term wholesale funding rate and a moving average of an intermediate term swap rate, with an appropriate spread applied to both. Shorter duration products are weighted towards the short-term wholesale funding rates and longer duration products are weighted towards intermediate swap rates. The expected duration ranges from 30 days for certain rate-sensitive deposits to five years. Substantially all revenue is from domestic customers. No single external customer accounts for more than 10% of total revenue. Net loans charged off and provision for credit losses represents net loans charged off or recovered as attributed to the lines of business. The provision for credit losses in excess of net charge-offs or recoveries is attributed to Funds Management and Other. The operations of CoBiz, acquired on October 1, 2018 were allocated to the operating segments in the second quarter of 2019. Prior to April 1, 2019, CoBiz operations were included in Funds Management and other. Reportable segments reconciliation to the Consolidated Financial Statements for the year ended December 31, 2021 is as follows (in thousands): Commercial Consumer Wealth Funds Management and Other BOK Net interest and dividend revenue from external sources $ 606,902 $ 67,856 $ 214,458 $ 228,817 $ 1,118,033 Net interest revenue (expense) from internal sources (71,167) 35,671 (386) 35,882 — Net interest and dividend revenue 535,735 103,527 214,072 264,699 1,118,033 Net loans charged off and provision for credit losses 31,128 4,009 (223) (134,914) (100,000) Net interest and dividend revenue after provision for credit losses 504,607 99,518 214,295 399,613 1,218,033 Other operating revenue 262,402 173,341 298,962 21,070 755,775 Other operating expense 281,089 209,596 320,357 366,666 1,177,708 Net direct contribution 485,920 63,263 192,900 54,017 796,100 Gain (loss) on financial instruments, net 154 (21,871) — 21,717 — Change in fair value of mortgage servicing rights — 41,637 — (41,637) — Gain (loss) on repossessed assets, net 13,001 85 — (13,086) — Corporate expense allocations 49,941 46,010 40,301 (136,252) — Net income before taxes 449,134 37,104 152,599 157,263 796,100 Federal and state income taxes 120,618 9,461 39,049 10,647 179,775 Net income 328,516 27,643 113,550 146,616 616,325 Net income attributable to non-controlling interests — — — (1,796) (1,796) Net income attributable to BOK Financial Corp. shareholders $ 328,516 $ 27,643 $ 113,550 $ 148,412 $ 618,121 Average assets $ 28,536,881 $ 10,029,687 $ 19,425,475 $ (7,840,340) $ 50,151,703 Reportable segments reconciliation to the Consolidated Financial Statements for the year ended December 31, 2020 is as follows (in thousands): Commercial Consumer Wealth Funds Management and Other BOK Net interest and dividend revenue from external sources $ 714,932 $ 78,004 $ 130,818 $ 184,690 $ 1,108,444 Net interest revenue (expense) from internal sources (126,444) 69,000 (13,528) 70,972 — Net interest and dividend revenue 588,488 147,004 117,290 255,662 1,108,444 Net loans charged off and provision for credit losses 69,475 2,805 (209) 150,521 222,592 Net interest and dividend revenue after provision for credit losses 519,013 144,199 117,499 105,141 885,852 Other operating revenue 187,361 243,719 398,834 12,406 842,320 Other operating expense 258,903 230,402 325,627 349,376 1,164,308 Net direct contribution 447,471 157,516 190,706 (231,829) 563,864 Gain (loss) on financial instruments, net 193 95,344 4 (95,541) — Change in fair value of mortgage servicing rights — (79,524) — 79,524 — Gain (loss) on repossessed assets, net (2,677) 276 — 2,401 — Corporate expense allocations 24,862 42,155 35,331 (102,348) — Net income before taxes 420,125 131,457 155,379 (143,097) 563,864 Federal and state income taxes 114,120 33,483 39,765 (58,575) 128,793 Net income 306,005 97,974 115,614 (84,522) 435,071 Net loss attributable to non-controlling interests — — — 41 41 Net income attributable to BOK Financial Corp. shareholders $ 306,005 $ 97,974 $ 115,614 $ (84,563) $ 435,030 Average assets $ 26,994,075 $ 9,842,114 $ 15,695,646 $ (3,827,445) $ 48,704,390 Reportable segments reconciliation to the Consolidated Financial Statements for the year ended December 31, 2019 is as follows (in thousands): Commercial Consumer Wealth Funds Management and Other BOK Net interest and dividend revenue from external sources $ 919,148 $ 99,679 $ 61,277 $ 32,775 $ 1,112,879 Net interest revenue (expense) from internal sources (242,907) 95,775 38,815 108,317 — Net interest and dividend revenue 676,241 195,454 100,092 141,092 1,112,879 Net loans charged off and provision for credit losses 39,011 6,271 (308) (974) 44,000 Net interest and dividend revenue after provision for credit losses 637,230 189,183 100,400 142,066 1,068,879 Other operating revenue 170,412 187,500 341,389 (4,068) 695,233 Other operating expense 252,459 226,346 277,267 377,172 1,133,244 Net direct contribution 555,183 150,337 164,522 (239,174) 630,868 Gain (loss) on financial instruments, net 106 30,375 2 (30,483) — Change in fair value of mortgage servicing rights — (53,517) — 53,517 — Gain (loss) on repossessed assets, net 331 496 — (827) — Corporate expense allocations 43,055 46,926 36,239 (126,220) — Net income before taxes 512,565 80,765 128,285 (90,747) 630,868 Federal and state income taxes 137,759 20,572 32,954 (61,102) 130,183 Net income 374,806 60,193 95,331 (29,645) 500,685 Net income attributable to non-controlling interests — — — (73) (73) Net income attributable to BOK Financial Corp. shareholders $ 374,806 $ 60,193 $ 95,331 $ (29,572) $ 500,758 Average assets $ 22,807,589 $ 9,301,341 $ 10,204,426 $ (219,009) $ 42,094,347

Fees and Commission Revenue (No

Fees and Commission Revenue (Notes)	12 Months Ended
	Dec. 31, 2021
Revenue from Contract with Customer [Abstract]
Fees and Commissions Revenue [Text Block]	Fees and Commissions Revenue Fees and commissions revenue by reportable segment and primary service line is as follows for the year ended December 31, 2021. Commercial Consumer Wealth Management Funds Management and Other Consolidated Out of Scope 1 In Scope 2 Trading revenue $ — $ — $ 27,595 $ — $ 27,595 $ 27,595 $ — Customer hedging revenue 23,424 — 300 (3,292) 20,432 20,432 — Retail brokerage revenue — — 18,762 — 18,762 — 18,762 Insurance brokerage revenue — — 11,765 — 11,765 — 11,765 Investment banking revenue 19,129 — 16,742 (1,436) 34,435 16,272 18,163 Brokerage and trading revenue 42,553 — 75,164 (4,728) 112,989 64,299 48,690 TransFund EFT network revenue 76,603 3,591 (67) 6 80,133 — 80,133 Merchant services revenue 11,806 55 — — 11,861 — 11,861 Corporate card revenue 4,502 — 169 318 4,989 — 4,989 Transaction card revenue 92,911 3,646 102 324 96,983 — 96,983 Personal trust revenue — — 97,582 — 97,582 — 97,582 Corporate trust revenue — — 14,805 — 14,805 — 14,805 Institutional trust & retirement plan services revenue — — 50,765 — 50,765 — 50,765 Investment management services and other — — 15,300 (178) 15,122 — 15,122 Fiduciary and asset management revenue — — 178,452 (178) 178,274 — 178,274 Commercial account service charge revenue 50,213 1,821 2,326 — 54,360 — 54,360 Overdraft fee revenue 104 21,439 70 9 21,622 — 21,622 Check card revenue — 23,714 — — 23,714 — 23,714 Automated service charge and other deposit fee revenue 94 4,340 87 — 4,521 — 4,521 Deposit service charges and fees 50,411 51,314 2,483 9 104,217 — 104,217 Mortgage production revenue — 60,712 — — 60,712 60,712 — Mortgage servicing revenue — 47,055 — (1,871) 45,184 45,184 — Mortgage banking revenue — 107,767 — (1,871) 105,896 105,896 — Other revenue 41,206 10,637 42,564 (24,457) 69,950 54,349 15,601 Total fees and commissions revenue $ 227,081 $ 173,364 $ 298,765 $ (30,901) $ 668,309 $ 224,544 $ 443,765 1 Out of scope revenue generally relates to financial instruments or contractual rights and obligations within the scope of other applicable accounting guidance. 2 In scope revenue represents revenue subject to FASB ASC Topic 606, Revenue from Contracts with Customers. Fees and commissions revenue by reportable segment and primary service line is as follows for the year ended December 31, 2020. Commercial Consumer Wealth Management Funds Management and Other Consolidated Out of Scope 1 In Scope 2 Trading revenue $ — $ — $ 144,299 $ — $ 144,299 $ 144,299 $ — Customer hedging revenue 22,767 — 395 (413) 22,749 22,749 — Retail brokerage revenue — — 15,690 — 15,690 — 15,690 Insurance brokerage revenue — — 12,702 — 12,702 — 12,702 Investment banking revenue 9,183 — 17,391 (181) 26,393 8,530 17,863 Brokerage and trading revenue 31,950 — 190,477 (594) 221,833 175,578 46,255 TransFund EFT network revenue 75,363 3,058 (56) 5 78,370 — 78,370 Merchant services revenue 9,172 60 — — 9,232 — 9,232 Corporate card revenue 2,362 — 75 143 2,580 — 2,580 Transaction card revenue 86,897 3,118 19 148 90,182 — 90,182 Personal trust revenue — — 84,759 — 84,759 — 84,759 Corporate trust revenue — — 19,308 — 19,308 — 19,308 Institutional trust & retirement plan services revenue — — 46,253 — 46,253 — 46,253 Investment management services and other — — 17,290 (165) 17,125 — 17,125 Fiduciary and asset management revenue — — 167,610 (165) 167,445 — 167,445 Commercial account service charge revenue 44,489 1,654 2,282 (4) 48,421 — 48,421 Overdraft fee revenue 132 21,679 74 7 21,892 — 21,892 Check card revenue — 21,355 — — 21,355 — 21,355 Automated service charge and other deposit fee revenue 311 4,749 74 3 5,137 — 5,137 Deposit service charges and fees 44,932 49,437 2,430 6 96,805 — 96,805 Mortgage production revenue — 125,848 — — 125,848 125,848 — Mortgage servicing revenue — 58,249 — (1,737) 56,512 56,512 — Mortgage banking revenue — 184,097 — (1,737) 182,360 182,360 — Other revenue 23,340 8,902 38,693 (19,240) 51,695 39,092 12,603 Total fees and commissions revenue $ 187,119 $ 245,554 $ 399,229 $ (21,582) $ 810,320 $ 397,030 $ 413,290 1 Out of scope revenue generally relates to financial instruments or contractual rights and obligations within the scope of other applicable accounting guidance. 2 In scope revenue represents revenue subject to FASB ASC Topic 606, Revenue from Contracts with Customers. Fees and commissions revenue by reportable segment and primary service line is as follows for the year ended December 31, 2019. Commercial Consumer Wealth Management Funds Management and Other Consolidated Out of Scope 1 In Scope 2 Trading revenue $ — $ — $ 88,558 $ — $ 88,558 $ 88,558 $ — Customer hedging revenue 8,422 — 9,667 852 18,941 18,941 — Retail brokerage revenue — — 16,251 (115) 16,136 — 16,136 Insurance brokerage revenue — — 10,131 3,730 13,861 — 13,861 Investment banking revenue 10,136 — 12,194 — 22,330 8,678 13,652 Brokerage and trading revenue 18,558 — 136,801 4,467 159,826 116,177 43,649 TransFund EFT network revenue 73,479 3,924 (82) 3 77,324 — 77,324 Merchant services revenue 8,607 56 — 123 8,786 — 8,786 Corporate card revenue 1,072 — 32 2 1,106 — 1,106 Transaction card revenue 83,158 3,980 (50) 128 87,216 — 87,216 Personal trust revenue — — 81,763 — 81,763 — 81,763 Corporate trust revenue — — 24,635 — 24,635 — 24,635 Institutional trust & retirement plan services revenue — — 45,084 — 45,084 — 45,084 Investment management services and other — — 23,993 1,550 25,543 — 25,543 Fiduciary and asset management revenue — — 175,475 1,550 177,025 — 177,025 Commercial account service charge revenue 42,251 1,713 2,137 1,804 47,905 — 47,905 Overdraft fee revenue 313 35,134 138 (229) 35,356 — 35,356 Check card revenue — 21,865 — 165 22,030 — 22,030 Automated service charge and other deposit fee revenue 823 6,155 168 48 7,194 — 7,194 Deposit service charges and fees 43,387 64,867 2,443 1,788 112,485 — 112,485 Mortgage production revenue — 42,724 — (4) 42,720 42,720 — Mortgage servicing revenue — 66,692 — (1,871) 64,821 64,821 — Mortgage banking revenue — 109,416 — (1,875) 107,541 107,541 — Other revenue 23,564 9,733 26,664 (1,853) 58,108 39,428 18,680 Total fees and commissions revenue $ 168,667 $ 187,996 $ 341,333 $ 4,205 $ 702,201 $ 263,146 $ 439,055 1 Out of scope revenue generally relates to financial instruments or contractual rights and obligations within the scope of other applicable accounting guidance. 2 In scope revenue represents revenue subject to FASB ASC Topic 606, Revenue from Contracts with Customers.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2021
Fair Value Disclosures [Abstract]
Fair Value Measurements [Text Block]	Fair Value Measurements Fair value is defined by applicable accounting guidance as the price to sell an asset or transfer a liability in an orderly transaction between market participants in the principal market for the given asset or liability at the measurement date based on market conditions at that date. An orderly transaction assumes exposure to the market for a customary period for marketing activities prior to the measurement date and not a forced liquidation or distressed sale. Certain assets and liabilities are recorded in the Company’s financial statements at fair value. Some are recorded on a recurring basis and some on a non-recurring basis. For some assets and liabilities, observable market transactions and market information might be available. For other assets and liabilities, observable market transactions and market information might not be available. A hierarchy for fair value has been established which categorizes into three levels the inputs to valuation techniques used to measure fair value. The three levels are as follows: Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) - fair value is based on unadjusted quoted prices in active markets for identical assets or liabilities. Significant Other Observable Inputs (Level 2) - fair value is based on significant other observable inputs which are generally determined based on a single price for each financial instrument provided to us by an applicable third-party pricing service and is based on one or more of the following: • Quoted prices for similar, but not identical, assets or liabilities in active markets; • Quoted prices for identical or similar assets or liabilities in inactive markets; • Inputs other than quoted prices that are observable, such as interest rate and yield curves, volatilities, prepayment speeds, loss severities, credit risks and default rates; • Other inputs derived from or corroborated by observable market inputs. Significant Unobservable Inputs (Level 3) - fair value is based upon model-based valuation techniques for which at least one significant assumption is not observable in the market. Transfers between levels are recognized as of the end of the reporting period. There were no transfers in or out of quoted prices in active markets for identical instruments to significant other observable inputs or significant unobservable inputs during the year ended December 31, 2021 and 2020, respectively. Transfers between significant other observable inputs and significant unobservable inputs during the year ended December 31, 2021 and 2020 are included in the summary of changes in recurring fair values measured using unobservable inputs. The underlying methods used by the third-party pricing services are considered in determining the primary inputs used to determine fair values. Management has evaluated the methodologies employed by the third-party pricing services by comparing the price provided by the pricing service with other sources, including brokers' quotes, sales or purchases of similar instruments and discounted cash flows to establish a basis for reliance on the pricing service values. Significant differences between the pricing service provided value and other sources are discussed with the pricing service to understand the basis for their values. Based on all observable inputs, management may adjust prices obtained from third-party pricing services to more appropriately reflect the prices that would be received to sell assets or paid to transfer liabilities in orderly transactions in the current market. No significant adjustments were made to prices provided by third-party pricing services at December 31, 2021 and 2020. Assets and Liabilities Measured at Fair Value on a Recurring Basis The fair value of financial assets and liabilities that are measured on a recurring basis is as follows as of December 31, 2021 (in thousands): Total Quoted Prices in Active Markets for Identical Instruments Significant Other Observable Inputs Significant Unobservable Inputs Assets: Trading securities: U.S. government securities $ 23,610 $ 4,999 $ 18,611 $ — Residential agency mortgage-backed securities 9,068,900 — 9,068,900 — Municipal securities 25,783 — 25,783 — Other trading securities 18,520 — 18,520 — Total trading securities 9,136,813 4,999 9,131,814 — Available for sale securities: U.S. Treasury 1,000 1,000 — — Municipal securities 508,365 — 508,365 — Residential agency mortgage-backed securities 8,006,616 — 8,006,616 — Residential non-agency mortgage-backed securities 24,339 — 24,339 — Commercial agency mortgage-backed securities 4,617,025 — 4,617,025 — Other debt securities 472 — — 472 Total available for sale securities 13,157,817 1,000 13,156,345 472 Fair value option securities — Residential agency mortgage-backed securities 43,770 — 43,770 — Residential mortgage loans held for sale 1 192,295 — 185,969 6,326 Mortgage servicing rights, net 2 163,198 — — 163,198 Derivative contracts, net of cash margin 3 1,097,297 8,331 1,088,966 — Liabilities: Derivative contracts, net of cash margin 3 275,625 — 275,625 — 1 Residential mortgage loans held for sale measured at fair value on a recurring basis using significant unobservable inputs (Level 3) consist of residential mortgage loans intended for sale to U.S. government agencies that fail to meet conforming standards and are valued at 95.07% of the unpaid principal balance. 2 A reconciliation of the beginning and ending fair value of mortgage servicing rights and disclosures of significant assumptions used to determine fair value are presented in Note 7, Mortgage Banking Activities. 3 See Note 3 for detail of fair value of derivative contracts by contract type. Derivative contracts in asset positions that were valued based on quoted prices in active markets for identical instruments (Level 1) are primarily exchange-traded interest rate derivative contracts. Derivative contracts in liability positions that were valued using quoted prices in active markets for identical instruments are exchange-traded energy derivative contracts, fully offset by cash margin. The fair value of financial assets and liabilities that are measured on a recurring basis is as follows as of December 31, 2020 (in thousands): Total Quoted Prices in Active Markets for Identical Instruments Significant Other Observable Inputs Significant Unobservable Inputs Assets: Trading securities: U.S. government securities $ 9,183 $ 4,999 $ 4,184 $ — Residential agency mortgage-backed securities 4,669,148 — 4,669,148 — Municipal securities 19,172 — 19,172 — Other trading securities 10,472 — 10,472 — Total trading securities 4,707,975 4,999 4,702,976 — Available for sale securities: U.S. Treasury 508 508 — — Municipal securities 167,979 — 167,979 — Residential agency mortgage-backed securities 9,340,471 — 9,340,471 — Residential non-agency mortgage-backed securities 32,770 — 32,770 — Commercial agency mortgage-backed securities 3,508,465 — 3,508,465 — Other debt securities 472 — — 472 Total available for sale securities 13,050,665 508 13,049,685 472 Fair value option securities — Residential agency mortgage-backed securities 114,982 — 114,982 — Residential mortgage loans held for sale 1 252,316 — 245,299 7,017 Mortgage servicing rights, net 2 101,172 — — 101,172 Derivative contracts, net of cash margin 3 810,688 10,780 799,908 — Liabilities: Derivative contracts, net of cash margin 3 405,779 — 405,779 — 1 Residential mortgage loans held for sale measured at fair value on a recurring basis using significant unobservable inputs (Level 3) consist of residential mortgage loans intended for sale to U.S. government agencies that fail to meet conforming standards and are valued at 94.57% of the unpaid principal balance. 2 A reconciliation of the beginning and ending fair value of mortgage servicing rights and disclosures of significant assumptions used to determine fair value are presented in Note 7, Mortgage Banking Activities. 3 See Note 3 for detail of fair value of derivative contracts by contract type. Derivative contracts based on quoted prices in active markets for identical instruments (Level 1) are exchange-traded interest rate derivative contracts, net of cash margin. Derivative contracts in liability positions that were valued using quoted prices in active markets for identical instruments (Level 1) are exchange-traded interest rate, energy and agricultural contracts, fully offset by cash margin. Following is a description of the Company's valuation methodologies used for assets and liabilities measured on a recurring basis: Securities The fair values of trading, available for sale and fair value option securities are based on quoted prices for identical instruments in active markets, when available. If quoted prices for identical instruments are not available, fair values are based on significant other observable inputs such as quoted prices of comparable instruments or interest rates and credit spreads, yield curves, volatilities, prepayment speeds and loss severities. The fair value of certain available for sale and held-to-maturity municipal and other debt securities may be based on significant unobservable inputs. These significant unobservable inputs include limited observed trades, projected cash flows, current credit rating of the issuers and, when applicable, the insurers of the debt and observed trades of similar debt. Discount rates are primarily based on reference to interest rate spreads on comparable securities of similar duration and credit rating as determined by the nationally-recognized rating agencies adjusted for a lack of trading volume. Significant unobservable inputs are developed by investment securities professionals involved in the active trading of similar securities. A summary of significant inputs used to value these securities follows. A management committee composed of senior members from the Company's Capital Markets, Risk Management and Finance departments assess the appropriateness of these inputs quarterly. Derivatives All derivative instruments are carried on the balance sheet at fair value. Fair values for exchange-traded contracts are based on quoted prices. Fair values for over-the-counter interest rate, commodity and foreign exchange contracts are based on valuations provided either by third-party dealers in the contracts, quotes provided by independent pricing services, or a third-party provided pricing model that uses significant other observable market inputs. Credit risk is considered in determining the fair value of derivative instruments. Management determines fair value adjustments based on various risk factors including but not limited to counterparty credit rating or equivalent loan grading, derivative contract notional size, price volatility of the underlying commodity, duration of the derivative contracts and expected loss severity. Expected loss severity is based on historical losses for similarly risk graded commercial loan customers. Decreases in counterparty credit rating or grading and increases in price volatility and expected loss severity all tend to increase the credit quality adjustment which reduces the fair value of asset contracts. We also consider our own credit risk in determining the fair value of derivative contracts. Changes in our credit rating would affect the fair value of our derivative liabilities. In the event of a credit downgrade, the fair value of our derivative liabilities would increase. Residential Mortgage Loans Held for Sale Residential mortgage loans held for sale are carried on the balance sheet at fair value. The fair values of conforming residential mortgage loans held for sale are based upon quoted market prices of such loans sold in securitization transactions, including related unfunded loan commitments. The fair value of mortgage loans that are unable to be sold to U.S. government agencies is determined using quoted prices of loans that are sold in securitization transactions with a liquidity discount applied. Fair Value of Assets and Liabilities Measured on a Non-Recurring Basis Assets measured at fair value on a non-recurring basis include pension plan assets, which are based on quoted prices in active markets for identical instruments, collateral for certain nonaccruing loans and real property and other assets acquired to satisfy loans, which are based primarily on comparisons to completed sales of similar assets. The following represents the carrying value of assets measured at fair value on a non-recurring basis and related losses recorded during the year. The carrying value represents only those assets with the balance sheet date for which the fair value was adjusted during the year: Carrying Value at December 31, 2021 Fair Value Adjustments for the Year Ended December 31, 2021 Recognized In: Quoted Prices Significant Significant Gross charge-offs against allowance for loan losses Other gains (losses), net Nonaccruing loans $ — $ 808 $ 1,990 $ 2,087 $ — Real estate and other repossessed assets — 1,706 — — (150) Carrying Value at December 31, 2020 Fair Value Adjustments for the Year Ended December 31, 2020 Recognized In: Quoted Prices Significant Significant Gross charge-offs against allowance for loan losses Other gains (losses), net Nonaccruing loans $ — $ 801 $ 20,423 $ 39,299 $ — Real estate and other repossessed assets — 18,188 2,842 — 4,602 The fair value of collateral-dependent nonaccruing loans and real estate and other repossessed assets and the related fair value adjustments are generally based on unadjusted third-party appraisals. Our appraisal review policies require appraised values to be supported by observed inputs derived principally from or corroborated by observable market data. Appraisals that are not based on observable inputs or that require significant adjustments or fair value measurements that are not based on third-party appraisals are considered to be based on significant unobservable inputs. Non-recurring fair value measurements of collateral-dependent nonaccruing loans and real estate and other repossessed assets based on significant unobservable inputs are generally due to estimates of current fair values between appraisal dates. Significant unobservable inputs include listing prices for comparable assets, uncorroborated expert opinions or management's knowledge of the collateral or industry. Non-recurring fair value measurements of collateral dependent loans secured by mineral rights are generally determined by our internal staff of engineers on projected cash flows under current market conditions and are based on significant unobservable inputs. Projected cash flows are discounted according to risk characteristics of the underlying oil and gas properties. Assets are evaluated to demonstrate with reasonable certainty that crude oil, natural gas and natural gas liquids can be recovered from known oil and gas reservoirs under existing economic and operating conditions at current prices with existing conventional equipment, operating methods and costs. Significant unobservable inputs are developed by asset management and workout professionals and approved by senior Credit Administration executives. A summary of quantitative information about Non-recurring Fair Value Measurements based on Significant Unobservable Inputs (Level 3) as of December 31, 2021 follows (in thousands): Quantitative Information about Level 3 Non-recurring Fair Value Measurements Fair Value Valuation Technique(s) Significant Unobservable Input Range Nonaccruing loans $ 1,990 Discounted cash flows Management knowledge of industry and non-real estate collateral including but not limited to recoverable oil & gas reserves, forward looking commodity prices, and estimated operating costs 16% - 97% (37%) 1 1 Represents fair value as a percentage of the unpaid principal balance. A summary of quantitative information about Non-recurring Fair Value Measurements based on Significant Unobservable Inputs (Level 3) as of December 31, 2020 follows (in thousands): Quantitative Information about Level 3 Non-recurring Fair Value Measurements Fair Value Valuation Technique(s) Significant Unobservable Input Range Nonaccruing loans $ 20,423 Discounted cash flows Management knowledge of industry and non-real estate collateral including but not limited to recoverable oil & gas reserves, forward looking commodity prices, and estimated operating costs 1% - 91% (23%) 1 Real estate and other repossessed assets 2,842 Discounted cash flows Management knowledge of industry and non-real estate collateral including but not limited to recoverable oil & gas reserves, forward looking commodity prices, and estimated operating costs N/A 1 Represents fair value as a percentage of the unpaid principal balance. The fair value of pension plan assets was approximately $39 million at December 31, 2021 and $38 million at December 31, 2020, determined by significant other observable inputs. Fair value adjustments of pension plan assets along with changes in the projected benefit obligation are recognized in other comprehensive income. Fair Value of Financial Instruments The following table presents the carrying values and estimated fair values of all financial instruments, including those financial assets and liabilities that are not measured and reported at fair value on a recurring basis or non-recurring (dollars in thousands): December 31, 2021 Carrying Estimated Fair Value Quoted Prices in Active Markets for Identical Instruments (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Cash and due from banks $ 712,067 $ 712,067 $ 712,067 $ — $ — Interest-bearing cash and cash equivalents 2,125,343 2,125,343 2,125,343 — — Trading securities: U.S. government securities 23,610 23,610 4,999 18,611 — Residential agency mortgage-backed securities 9,068,900 9,068,900 — 9,068,900 — Municipal securities 25,783 25,783 — 25,783 — Other trading securities 18,520 18,520 — 18,520 — Total trading securities 9,136,813 9,136,813 4,999 9,131,814 — Investment securities: Municipal securities 203,772 223,609 — 57,698 165,911 Residential agency mortgage-backed securities 6,939 7,500 — 7,500 — Other debt securities 288 286 — 286 — Total investment securities 210,999 231,395 — 65,484 165,911 Allowance for credit losses (555) — — — — Investment securities, net of allowance 210,444 231,395 — 65,484 165,911 Available for sale securities: U.S. Treasury 1,000 1,000 1,000 — — Municipal securities 508,365 508,365 — 508,365 — Residential agency mortgage-backed securities 8,006,616 8,006,616 — 8,006,616 — Residential non-agency mortgage-backed securities 24,339 24,339 — 24,339 — Commercial agency mortgage-backed securities 4,617,025 4,617,025 — 4,617,025 — Other debt securities 472 472 — — 472 Total available for sale securities 13,157,817 13,157,817 1,000 13,156,345 472 Fair value option securities — Residential agency mortgage-backed securities 43,770 43,770 — 43,770 — Residential mortgage loans held for sale 192,295 192,295 — 185,969 6,326 Loans: Commercial 12,506,465 12,395,664 — — 12,395,664 Commercial real estate 3,831,325 3,786,767 — — 3,786,767 Paycheck protection program 276,341 269,912 — — 269,912 Loans to individuals 3,591,549 3,586,878 — — 3,586,878 Total loans 20,205,680 20,039,221 — — 20,039,221 Allowance for loan losses (256,421) — — — — Loans, net of allowance 19,949,259 20,039,221 — — 20,039,221 Mortgage servicing rights 163,198 163,198 — — 163,198 Derivative instruments with positive fair value, net of cash margin 1,097,297 1,097,297 8,331 1,088,966 — Deposits with no stated maturity 39,537,731 39,537,731 — — 39,537,731 Time deposits 1,704,328 1,703,886 — — 1,703,886 Other borrowed funds 2,363,202 2,360,746 — — 2,360,746 Subordinated debentures 131,226 141,761 — 141,761 — Derivative instruments with negative fair value, net of cash margin 275,625 275,625 — 275,625 — December 31, 2020 Carrying Estimated Fair Value Quoted Prices in Active Markets for Identical Instruments (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Cash and due from banks $ 798,757 $ 798,757 $ 798,757 $ — $ — Interest-bearing cash and cash equivalents 381,816 381,816 381,816 — — Trading securities: U.S. government securities 9,183 9,183 4,999 4,184 — Residential agency mortgage-backed securities 4,669,148 4,669,148 — 4,669,148 — Municipal securities 19,172 19,172 — 19,172 — Other trading securities 10,472 10,472 — 10,472 — Total trading securities 4,707,975 4,707,975 4,999 4,702,976 — Investment securities: Municipal securities 229,245 255,270 — 69,404 185,866 Residential agency mortgage-backed securities 8,913 9,790 — 9,790 — Other debt securities 7,373 7,371 — 7,371 — Total investment securities 245,531 272,431 — 86,565 185,866 Allowance for credit losses (688) — — — — Investment securities, net of allowance 244,843 272,431 — 86,565 185,866 Available for sale securities: U.S. Treasury securities 508 508 508 — — Municipal securities 167,979 167,979 — 167,979 — Residential agency mortgage-backed securities 9,340,471 9,340,471 — 9,340,471 — Residential non-agency mortgage-backed securities 32,770 32,770 — 32,770 — Commercial agency mortgage-backed securities 3,508,465 3,508,465 — 3,508,465 — Other debt securities 472 472 — — 472 Total available for sale securities 13,050,665 13,050,665 508 13,049,685 472 Fair value option securities — Residential agency mortgage-backed securities 114,982 114,982 — 114,982 — Residential mortgage loans held for sale 252,316 252,316 — 245,299 7,017 Loans: Commercial 13,077,535 13,003,383 — — 13,003,383 Commercial real estate 4,698,538 4,649,763 — — 4,649,763 Paycheck protection program 1,682,310 1,669,461 — — 1,669,461 Loans to individuals 3,549,137 3,563,199 — — 3,563,199 Total loans 23,007,520 22,885,806 — — 22,885,806 Allowance for loan losses (388,640) — — — — Loans, net of allowance 22,618,880 22,885,806 — — 22,885,806 Mortgage servicing rights 101,172 101,172 — — 101,172 Derivative instruments with positive fair value, net of cash margin 810,688 810,688 10,780 799,908 — Deposits with no stated maturity 34,176,752 34,176,752 — — 34,176,752 Time deposits 1,967,128 1,976,936 — — 1,976,936 Other borrowed funds 3,545,356 3,542,489 — — 3,542,489 Subordinated debentures 276,005 269,544 — 269,544 — Derivative instruments with negative fair value, net of cash margin 405,779 405,779 — 405,779 — Because no market exists for certain of these financial instruments and management does not intend to sell these financial instruments, the fair values shown in the tables above may not represent values at which the respective financial instruments could be sold individually or in the aggregate at the given reporting date. Fair Value Election As more fully disclosed in Note 2 and Note 7 to the Consolidated Financial Statements, the Company has elected to carry all securities held as economic hedges against changes in the fair value of mortgage servicing rights and all residential mortgage loans originated for sale at fair value. Changes in the fair value of these financial instruments are recognized in earnings.

Parent Company Only Financial S

Parent Company Only Financial Statements Parent Company Only Financial Statements	12 Months Ended
	Dec. 31, 2021
Condensed Financial Information Disclosure [Abstract]
Condensed Financial Information of Parent Company Only Disclosure [Text Block]	Parent Company Only Financial Statements Summarized financial information for BOK Financial – Parent Company Only follows: Balance Sheets (In thousands) December 31, 2021 2020 Assets Cash and cash equivalents $ 230,647 $ 183,805 Loan to bank subsidiary 65,187 65,204 Investment in bank subsidiary 4,951,405 5,079,336 Investment in non-bank subsidiaries 228,447 195,768 Other assets 22,011 24,338 Total assets $ 5,497,697 $ 5,548,451 Liabilities and Shareholders’ Equity Liabilities: Other liabilities $ 2,739 $ 6,180 Subordinated debentures 131,226 276,005 Total liabilities 133,965 282,185 Shareholders’ equity: Common stock 5 5 Capital surplus 1,378,794 1,368,062 Retained earnings 4,447,691 3,973,675 Treasury stock (535,129) (411,344) Accumulated other comprehensive income 72,371 335,868 Total shareholders’ equity 5,363,732 5,266,266 Total liabilities and shareholders’ equity $ 5,497,697 $ 5,548,451 Statements of Earnings (In thousands) Year Ended December 31, 2021 2020 2019 Dividends, interest and fees received from bank subsidiary $ 483,868 $ 179,140 $ 344,007 Dividends, interest and fees received from non-bank subsidiaries 8,030 25,050 9,325 Other revenue 767 907 1,036 Total revenue 492,665 205,097 354,368 Interest expense 10,535 13,944 15,113 Other operating expense 2,914 2,697 2,352 Total expense 13,449 16,641 17,465 Net income before taxes, other losses, net, and equity in undistributed income of subsidiaries 479,216 188,456 336,903 Other gains (losses), net (3,415) 1,465 3,310 Net income before taxes and equity in undistributed income of subsidiaries 475,801 189,921 340,213 Federal and state income taxes (4,202) (4,502) (4,516) Net income before equity in undistributed income of subsidiaries 480,003 194,423 344,729 Equity in undistributed income of bank subsidiaries 126,380 276,217 166,797 Equity in undistributed income of non-bank subsidiaries 11,738 (35,610) (10,768) Net income attributable to BOK Financial Corp. shareholders $ 618,121 $ 435,030 $ 500,758 Statements of Cash Flows (In thousands) Year Ended December 31, 2021 2020 2019 Cash Flows From Operating Activities: Net income $ 618,121 $ 435,030 $ 500,758 Adjustments to reconcile net income to net cash provided by operating activities: Equity in undistributed income of bank subsidiaries (126,380) (276,217) (166,797) Equity in undistributed income of non-bank subsidiaries (11,738) 35,610 10,768 Other losses (gains), net 3,415 (1,465) (3,310) Change in other assets 1,160 15,225 (1,765) Change in other liabilities 389 850 855 Net cash provided by operating activities 484,967 209,033 340,509 Cash Flows From Investing Activities: Investment in subsidiaries (25,665) (14,807) (19,837) Dissolution of subsidiaries 4,457 — — Net cash used in investing activities (21,208) (14,807) (19,837) Cash Flows From Financing Activities: Repayment of subordinated debentures (150,000) — — Issuance of common and treasury stock, net (4,874) (4,933) (7) Dividends paid (144,105) (144,437) (143,496) Repurchase of common stock (117,938) (75,830) (129,483) Net cash used in financing activities (416,917) (225,200) (272,986) Net increase (decrease) in cash and cash equivalents 46,842 (30,974) 47,686 Cash and cash equivalents at beginning of period 183,805 214,779 167,093 Cash and cash equivalents at end of period $ 230,647 $ 183,805 $ 214,779 Cash paid for interest $ 10,559 $ 14,064 $ 15,099

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2021
Subsequent Events [Abstract]
Subsequent Events [Text Block]	Subsequent Events The Company evaluated events from the date of the Consolidated Financial Statements on December 31, 2021 through the issuance of those consolidated financial statements included in this Annual Report on Form 10-K. No events were identified requiring recognition in and/or disclosure in the Consolidated Financial Statements.

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2021
Accounting Policies [Abstract]
Basis of Presentation [Policy Text Block]	The Consolidated Financial Statements of BOK Financial Corporation (“BOK Financial” or “the Company”) have been prepared in conformity with accounting principles generally accepted in the United States ("U.S. GAAP"), including interpretations of U.S. GAAP issued by federal banking regulators and general practices of the banking industry.
Consolidation [Policy Text Block]	The Consolidated Financial Statements include the accounts of BOK Financial and its subsidiaries, principally BOKF, NA, BOK Financial Securities, Inc., BOK Financial Private Wealth, Inc., BOK Financial Insurance, Inc. and Cavanal Hill Distributors, Inc. All significant intercompany transactions are eliminated in consolidation. The Consolidated Financial Statements include the assets, liabilities, non-controlling interests and results of operations of variable interest entities (“VIEs”) when BOK Financial is determined to be the primary beneficiary. Variable interest entities are generally defined as entities that either do not have sufficient equity to finance their activities without support from other parties or whose equity investors lack a controlling financial interest. Determination that the Company is the primary beneficiary considers the power to direct the activities that most significantly impact the variable interest's economic performance and the obligation to absorb losses of the variable interest or the right to receive benefits of the variable interest that could be significant to the variable interest.
Reclassifications [Text Block]	Certain prior year amounts have been reclassified to conform to current year presentation.
Nature of Operations [Text Block]	Nature of Operations BOK Financial, through its subsidiaries, provides a wide range of financial services to commercial and industrial customers, other financial institutions, municipalities, and consumers. These services include depository and cash management; lending and lease financing; mortgage banking; securities brokerage, trading and underwriting; and personal and corporate trust. BOKF, NA operates as Bank of Oklahoma primarily in the Tulsa and Oklahoma City metropolitan areas of the state of Oklahoma and Bank of Texas primarily in the Dallas, Fort Worth and Houston metropolitan areas of the state of Texas. In addition, BOKF, NA does business as BOK Financial in the metropolitan areas of Phoenix, Arizona; Northwest Arkansas; Denver, Colorado; Kansas City, Missouri/Kansas; and as Bank of Albuquerque in Albuquerque, New Mexico. BOKF, NA also operates the TransFund electronic funds network, Cavanal Hill Investment Management, and BOK Financial Asset Management, Inc.
Use of Estimates [Policy Text Block]	Use of Estimates Preparation of BOK Financial's Consolidated Financial Statements requires management to make estimates of future economic activities, including loan collectability, loss contingencies, prepayments and cash flows from customer accounts. These estimates are based upon current conditions and information available to management. Actual results may differ significantly from these estimates.
Acquisitions [Policy Text Block]	Acquisitions Assets and liabilities acquired, including identifiable intangible assets, are recorded at fair value on the acquisition date. The purchase price includes consideration paid at closing and the estimated fair value of contingent consideration that will be paid in the future, subject to achieving defined performance criteria. Premiums and discounts assigned to interest-earning assets and interest-bearing liabilities are amortized over the lives of the acquired assets and liabilities on either an individual instrument or pool basis. Goodwill is recognized as the excess of the purchase price over the net fair value of assets acquired and liabilities assumed. Acquired loans with more than an insignificant credit deterioration since inception are recorded at fair value plus a gross-up amount which is offset by an allowance for credit losses. Acquired loans without a more than insignificant credit deterioration since inception are recorded at fair value. An allowance for credit losses is recognized through a provision for credit losses, similar to origination loans. The Consolidated Statements of Earnings include the results of operations from the acquisition date.
Goodwill and Intangible Assets [Policy Text Block]	Goodwill and Intangible Assets Goodwill for each reporting unit is evaluated for impairment annually as of October 1st or more frequently if conditions indicate that impairment may have occurred. The evaluation of possible goodwill impairment involves significant judgment based upon short-term and long-term projections of future performance. Reporting units are defined by the Company as significant lines of business within each operating segment. This definition is consistent with the manner in which the chief operating decision maker assesses the performance of the Company and makes decisions concerning the allocation of resources. During the evaluation for impairment, management qualitatively assesses whether it is more likely than not that the fair value of the reporting units is less than their carrying value. Reporting unit carrying value includes sufficient capital to exceed regulatory requirements plus goodwill. This assessment includes consideration of relevant events and circumstances including, but not limited to, macroeconomic conditions, industry and market conditions, the financial and stock performance of the Company and other relevant factors. Specifically, the analysis may include: • General economic conditions including overall economic activity, consumer spending and mobility, unemployment rates, consumer confidence, and duration and severity of any current market moving instability. • Global health concerns including ongoing pandemics or potential for widespread health issues, the future course of a pandemic and the potential for medical advances. • Regional economic conditions including demand for oil and price stability of oil, other overarching conditions that may be affecting any of the Company's primary states such as weather or other catastrophes, pandemics and health related lockdowns, or other state mandates. • Industry conditions including federal funds rate movement by the Federal Reserve, the interest rate environment and the resulting effect on net interest revenue and operating revenue, and regulatory mandates that hinder or provide relief to the financial services industry. • Company specific conditions including current and forecasted income, changes in stock price, the Company's stock price compared to peers and other indexes, book value per share compared to fair value per share, goodwill compared to total shareholders' equity, current capital and liquidity position, demand for products and services, health of the loan portfolio and other credit related factors, and current credit ratings with the ratings agencies, and regulatory ratings. • Reporting unit performance and forecasts including any event that may significantly impact a reporting unit. If management concludes based on the qualitative assessment that goodwill may be impaired, a quantitative impairment test will be applied to goodwill at all reporting units. The quantitative analysis compares the fair value of the reporting unit with its carrying value. The fair value of each reporting unit is estimated by the discounted future earnings method. Goodwill is considered impaired if the fair value of the reporting unit is less than the carrying value of the reporting unit, including goodwill. Both the qualitative assessment and quantitative analysis require significant management judgment, including estimates of changes in future economic conditions and their underlying causes and duration, the reasonableness and effectiveness of management's responses to those changes, changes in governmental fiscal and monetary policies, and fair value measurements based largely on significant unobservable inputs. The results of these judgments may have a significant impact on the Company's reported results of operations. See Note 6, "Goodwill and Intangible Assets" for breakout of goodwill by reporting unit. Intangible assets are generally composed of customer relationships, naming rights, non-compete agreements and core deposit premiums. They are amortized using accelerated or straight-line methods, as appropriate, over the estimated benefit periods. These periods range from 3 years to 20 years. The net book values of identifiable intangible assets are evaluated for impairment when economic conditions indicate impairment may exist.
Cash Equivalents [Policy Text Block]	Cash Equivalents Due from banks, funds sold (generally federal funds sold for one day), resell agreements (which generally mature within one day to 30 days) and investments in money market funds are considered cash equivalents.
Securities [Policy Text Block]	Securities Securities are identified as trading, investment (held to maturity) or available for sale at the time of purchase based upon the intent of management, liquidity and capital requirements, regulatory limitations and other relevant factors. Trading securities, which are acquired for profit through resale, are carried at fair value with unrealized gains and losses included in current period earnings. Investment securities are carried at amortized cost. Amortization is computed by methods that approximate level yield and is adjusted for changes in prepayment estimates. Securities identified as available for sale are carried at fair value. Unrealized gains and losses are recorded, net of deferred income taxes, as accumulated other comprehensive income in shareholders' equity. Available for sale securities are separately identified as pledged to creditors if the creditor has the right to sell or re-pledge the collateral. The purchase or sale of securities is recognized on a trade date basis. Realized gains and losses on sales of securities are based upon specific identification of the security sold. A receivable or payable is recognized for subsequent transaction settlement. On a quarterly basis, the Company performs separate evaluations of debt investment and available for sale securities for the presence of impairment. We assess whether impairment is present on an individual security basis when the fair value of a debt security is less than the amortized cost. Management determines whether it intends to sell or if it is more likely than not that it will be required to sell impaired securities. This determination considers current and forecasted liquidity requirements and securities portfolio management. If the Company intends to sell or it is more likely than not that it will be required to sell the impaired debt security, a charge is recognized against earnings for the entire unrealized loss. For all impaired debt securities for which there is no intent or expected requirement to sell, the evaluation considers all available evidence to assess whether it is more likely than not that all amounts due would not be collected according to the security's contractual terms and whether there is any impairment attributable to credit-related factors. If an impairment exists, the amount attributed to credit-related factors is measured and an allowance for credit loss is recognized. Declines in fair value that are not recorded in the allowance are recorded in other comprehensive income, net of taxes. BOK Financial may elect to carry certain securities that are not held for trading purposes at fair value with changes in fair value recognized in current period income. These securities are held with the intent that gains or losses will offset changes in the fair value of mortgage servicing rights or other financial instruments. Restricted equity securities represent equity interests the Company is required to hold in the Federal Reserve Banks and Federal Home Loan Banks. Restricted equity securities are carried at cost as these securities do not have a readily determined fair value because ownership of these shares is restricted and they lack a market. The fair value of our securities portfolio is generally based on a single price for each financial instrument provided to us by a third-party pricing service determined by one or more of the following: • Quoted prices for similar, but not identical, assets or liabilities in active markets; • Quoted prices for identical or similar assets or liabilities in inactive markets; • Inputs other than quoted prices that are observable, such as interest rate and yield curves, volatilities, prepayment speeds, loss severities, credit risks and default rates; and • Other inputs derived from or corroborated by observable market inputs.
Derivatives Instruments [Policy Text Block]	Derivative Instruments Derivative instruments may be used by the Company as part of its internal risk management programs or may be offered to customers. All derivative instruments are carried at fair value and changes in fair value are generally reported in income as they occur. The determination of fair value of derivative instruments considers changes in interest rates, commodity prices and foreign exchange rates. Fair values for exchange-traded contracts are based on quoted prices in an active market for identical instruments. Fair values for over-the-counter contracts are generated internally using third-party valuation models. Inputs used in third-party valuation models to determine fair values are considered significant other observable inputs. Credit risk is also considered in determining fair value. Deterioration in the credit rating of customers or other counterparties reduces the fair value of asset contracts. Deterioration of our credit rating could decrease the fair value of our derivative liabilities. When bilateral netting agreements or similar agreements exist between the Company and its counterparties that create a single legal claim or obligation to pay or receive the net amount in settlement of the individual derivative contracts, the Company reports derivative assets and liabilities on a net by derivative contract by counterparty basis. Derivative contracts may also require the Company to provide or receive cash margin as collateral for derivative assets and liabilities. Derivative assets and liabilities are reported net of cash margin when certain conditions are met. In addition, derivative contracts executed with customers under Customer Risk Management Programs may be secured by non-cash collateral in conjunction with a credit agreement with that customer. Access to collateral in the event of default is reasonably assured. BOK Financial offers programs that permit its customers to manage various risks, including fluctuations in energy, cattle and other agricultural products, interest rates and foreign exchange rates with derivative contracts. Customers may also manage interest rate risk through interest rate swaps used by the borrower to modify interest rate terms of their loans. Derivative contracts are executed between the customers and BOK Financial. Offsetting contracts are executed between BOK Financial and other selected counterparties to minimize market risk from changes in commodity prices, interest rates or foreign exchange rates. The counterparty contracts are identical to customer contracts, except for a fixed pricing spread or fee paid to BOK Financial as profit and compensation for administrative costs and credit risk which is recognized over the life of the contracts and included in Other Operating Revenue - Brokerage and trading revenue in the Consolidated Statements of Earnings. BOK Financial may offer derivative instruments such as to-be-announced U.S. agency residential mortgage-backed securities to mortgage banking customers to enable them to manage their market risk or to mitigate the Company's market risk of holding trading securities. Changes in the fair value of derivative instruments for trading purposes or used to mitigate the market risk of holding trading securities are included in Other Operating Revenue - Brokerage and trading revenue. BOK Financial may use derivative instruments in managing its interest rate sensitivity, as part of its economic hedge of the changes in the fair value of mortgage servicing rights. Changes in the fair value of derivative instruments used in managing interest rate sensitivity and as part of its economic hedge of changes in the fair value of mortgage servicing rights are included in Other Operating Revenue - Gain (loss) on derivatives, net in the Consolidated Statements of Earnings. BOK Financial also enters into mortgage loan commitments that are considered derivative contracts. Forward sales contracts that have not been designated as hedging instruments are used to economically hedge these mortgage loan commitments as well as mortgage loans held for sale. Mortgage loan commitments, forward sales contracts, and residential mortgage loans held for sale are carried at fair value. Changes in the fair value are reported in Other Operating Revenue - Mortgage banking revenue.
Loans [Policy Text Block]	Loans Loans are either secured or unsecured based on the type of loan and the financial condition of the borrower. Repayment is generally expected from cash flow or proceeds from the sale of selected assets of the borrower. BOK Financial is exposed to risk of loss on loans due to the borrower's financial difficulties, which may arise from any number of factors, including problems within the respective industry or local economic conditions. Access to collateral, in the event of borrower default, is reasonably assured through adherence to applicable lending laws and through sound lending standards and credit review procedures. Accounting policies for all loans, excluding residential mortgage loans guaranteed by U.S. government agencies, are as follows. Interest is accrued at the applicable interest rate on the outstanding principal amount. Loans are placed on nonaccruing status when, in the opinion of management, full collection of principal or interest is uncertain. Internally risk graded loans are individually evaluated for nonaccruing status quarterly. Non-risk graded loans are generally placed on nonaccruing status when 90 days or more past due or within 60 days of being notified of the borrower's bankruptcy filing. Interest previously accrued but not collected is charged against interest income when the loan is placed on nonaccruing status. Payments received on nonaccruing loans are applied to principal or recognized as interest income, according to management's judgment as to the collectability of principal. Loans may be returned to accruing status when, in the opinion of management, full collection of principal and interest, including principal previously charged off, is probable based on improvements in the borrower's financial condition or a sustained period of performance. For loans acquired with no evidence of credit deterioration, discounts are accreted on either an individual basis for loans with unique characteristics or on a pool basis for groups of homogeneous loans. Accretion is discontinued when a loan with an individually attributed discount is placed on nonaccruing status. Loans to borrowers experiencing financial difficulties may be modified in troubled debt restructurings ("TDRs"). TDRs are generally classified as nonaccruing, excluding loans guaranteed by U.S. government agencies. Modifications generally consist of extension of payment terms or interest rate concessions and may result either voluntarily through negotiations with the borrower or involuntarily through court order. Payment deferrals of up to six months are generally considered to be short-term modifications. Generally, principal and accrued but unpaid interest is not voluntarily forgiven. Performing loans may be renewed under the then current collateral, debt service ratio and other underwriting standards. Nonaccruing loans may also be renewed and will remain classified as nonaccruing. Occasionally, loans, other than residential mortgage loans, may be held for sale in order to manage credit concentration. These loans are carried at the lower of cost or fair value with gains or losses recognized in gain (loss) on assets. All loans are charged-off when the loan balance or a portion of the loan balance is no longer supported by the paying capacity of the borrower or when the required cash flow is reduced in a TDR. The charge-off amount is determined through an evaluation of available cash resources and collateral value. Internally risk graded loans are evaluated quarterly and charge-offs are taken in the quarter in which the loss is identified. Non-risk graded loans that are past due between 60 days and 180 days, based on the loan product type, are charged off. Loans to borrowers whose personal obligation has been discharged through Chapter 7 bankruptcy proceedings are charged off within 60 days of notice of the bankruptcy filing, regardless of payment status. Loan origination and commitment fees and direct loan acquisition and origination costs are deferred and amortized as an adjustment to yield over the life of the loan or over the commitment period, as applicable. Amortization does not anticipate loan prepayments. Net unamortized fees are recognized in full at time of payoff. Qualifying residential mortgage loans guaranteed by U.S. government agencies have been sold into GNMA pools. Under certain performance conditions specified in government programs, the Company has the right, but not the obligation to repurchase loans from GNMA pools. These loans no longer qualify for sale accounting and are recognized in the Consolidated Balance Sheets. Guaranteed loans are considered to be impaired because we do not expect to receive all principal and interest based on the loan's contractual terms. A portion of the principal balance continues to be guaranteed; however, interest accrues at a curtailed rate as specified in the programs. The carrying value of these loans is reduced based on an estimate of expected cash flows discounted at the original note rate plus a liquidity spread. Guaranteed loans may be modified in TDRs in accordance with U.S. government agency guidelines. Interest continues to accrue at the modified rate. Guaranteed loans may either be resold into GNMA pools after a performance period specified by the programs or foreclosed and conveyed to the guarantors. Loans are disaggregated into portfolio segments and further disaggregated into classes. The portfolio segment is the level at which the Company develops and documents a systematic method for determining its Allowance for Credit Losses. Classes are based on the risk characteristics of the loans and the Company's method for monitoring and assessing credit risk.
Allowance for Loan Losses and Accrual for Off-Balance Sheet Credit Losses [Policy Text Block]	Allowances for Credit Losses and Accrual for Off-balance Sheet Credit Risk from Unfunded Loans Commitments BOK Financial’s accounting policies have changed significantly with the adoption of CECL as of January 1, 2020. Prior periods are not restated. Prior to January 1, 2020, general allowances and nonspecific allowances were based on incurred credit losses in accordance with accounting policies disclosed in Note 1 of the Consolidated Financial Statements included in the 2019 Form 10-K. The allowance for loan losses and accrual for off-balance sheet credit risk from unfunded loan commitments represent the portion of the amortized cost basis of loans that we do not expect to collect over the asset’s contractual life, considering past events, current conditions, and reasonable and supportable forecasts of future economic conditions. The appropriateness of the allowance for credit losses, including industry and product adjustments, is assessed quarterly by a senior management Allowance Committee. This review is based on an on-going evaluation of the estimated expected credit losses in the portfolio and on unused commitments to provide financing. A well-documented methodology has been developed and is applied by an independent Credit Administration department to assure consistency across the Company. The allowance for loan losses consists of specific allowances attributed to certain individual loans, generally nonaccruing loans, with dissimilar risk characteristics that have not yet been charged down to amounts we expect to recover and general allowances for estimated credit losses on pools of loans that share similar risk characteristics. When full collection of principal or interest is uncertain, the loan’s risk characteristics have changed, and we exclude the loan from the general allowance pool, typically designating it as nonaccruing. For these loans, a specific allowance reflects the expected credit loss. We measure specific allowances for loans excluded from the general allowance pool by an evaluation of estimated future cash flows discounted at the loan's initial effective interest rate or the fair value of collateral for certain collateral dependent loans. For a non-collateral dependent loan, the specific allowance is the amount by which the loan’s amortized cost basis exceeds its net realizable value. We measure the specific allowance for collateral dependent loans as the amount by which the loan’s amortized cost basis exceeds its fair value. When repayment is expected to be provided substantially through the sale of collateral, we deduct estimated selling costs from the collateral’s fair value. Generally, third party appraisals that conform to Uniform Standards of Professional Appraisal Practice serve as the basis for the fair value of real property held as collateral. These appraised values are on an “as-is” basis and generally are not adjusted by the Company. We obtain updated appraisals at least annually or more frequently if market conditions indicate collateral values may have declined. For energy loans, our internal staff of engineers generally determines collateral value of mineral rights based on projected cash flows from proven oil and gas reserves under existing economic and operating conditions. For real property held as collateral for other loans, third party appraisals that conform to Uniform Standards of Professional Appraisal Practice generally serve as the basis for the fair value. These appraised values are on an “as-is” basis and generally are not adjusted by the Company. We obtain updated appraisals at least annually or more frequently if market conditions indicate collateral values may have declined. Our special assets staff generally determines the value of other collateral based on projected liquidation cash flows under current market conditions. We evaluate collateral values and available cash resources quarterly. Historical statistics may be used to estimate specific allowances in limited situations, such as when a collateral dependent loan is removed from the general allowance pool near the end of a reporting period until an appraisal of collateral value is received or a full assessment of future cash flows is completed. General allowances estimate expected credit losses on pools of loans sharing similar risk characteristics that are expected to occur over the loan’s estimated remaining life. The loan’s estimated remaining life represents the contractual term adjusted for amortization, estimates of prepayments, and borrower-owned extension options. Approximately 90 percent of the committed dollars in the loan portfolio is risk graded loans with general allowance model inputs that include probability of default, loss given default, and exposure at default. Probability of default is based on the migration of loans from performing to nonperforming using historical life of loan analysis periods. Loss given default is based on the aggregate losses incurred, net of estimated recoveries. Exposure at default represents an estimate of the outstanding amount of credit exposure at the time a default may occur. Charge-off migration is used to calculate the general allowance for the majority of non-risk graded loans to individuals. The expected credit loss on less than 10% of the committed dollars in the portfolio is calculated using charge-off migration. The expected credit loss on approximately 1% of the committed dollars in the portfolio is calculated using a non-modeled approach. Specifically, the calculation applies a long-term net charge-off rate to the loan balances, adjusted for the weighted average remaining maturity of each portfolio. In estimating the expected credit losses for general allowances on performing risk-graded loans, each portfolio class is assigned relevant economic loss drivers which best explain variations in portfolio net loss rates. The probability of default estimates for each portfolio class are adjusted for current and forecasted economic conditions. The result is applied to the exposure at default and loss given default to calculate the lifetime expected credit loss estimate. Selection of relevant economic loss drivers is re-evaluated periodically and involves statistical analysis as well as management judgment. The unemployment rate factors significantly in the allowance for loan losses calculation, affecting commercial and loans to individuals segments. Other primary factors impacting the commercial portfolio include BBB corporate spreads, real gross domestic product growth rate, and energy commodity prices. The primary commercial real estate variables are vacancy rate and BBB corporate spreads. In addition to the unemployment rate, the forecast for loans to individuals is tied to home price index. The forecasts may include regional economic factors when localized conditions diverge from national conditions. An Economic Forecast Committee, consisting of senior management with members largely independent of the allowance process develops a twelve-month forward-looking forecast for the relevant economic loss drivers. Management develops these forecasts based on external data as well as a view of future economic conditions, which may include adjustments for regional conditions. The forecast includes three economic scenarios and probability weights for each scenario. The base forecast represents management's view of the most likely outcome, while the downside forecast reflects reasonably possible worsening economic conditions, and the upside forecast projects reasonably possible improving conditions. At the end of the one-year reasonable and supportable forecast period, we transition from shorter-term expected losses to long-term loss averages for the loan’s estimated remaining life. The difference between short-term loss forecasts and long-term loss averages is run-off over the reversion horizon, up to three years, depending on the forecasted economic scenarios. General allowances also consider the estimated impact of factors that are not captured in the modeled results or historical experience. These factors may increase or decrease modeled results by amounts determined by the Allowance Committee. Factors not captured in modeled results or historical experience may include for example, new lines of business, market conditions that have not been previously encountered, observed changes in credit risk that are not yet reflected in macro-economic factors, or economic conditions that impact loss given default assumptions. The accrual for off-balance sheet credit risk is maintained at a level that is appropriate to cover estimated losses associated with credit instruments that are not currently recognized as assets such as loan commitments, standby letters of credit or guarantees that are not unconditionally cancellable by the bank. This accrual is included in other liabilities in the Consolidated Balance Sheets. The appropriateness of the accrual is determined in the same manner as the allowance for loan losses, with the added consideration of commitment usage over the remaining life for those loans that the bank can not unconditionally cancel.
Real Estate and Other Repossessed Assets [Policy Text Block]	Real Estate and Other Repossessed Assets Real estate and other repossessed assets are acquired in partial or total forgiveness of loans. These assets are initially recognized at cost, which is determined by fair value at date of foreclosure less estimated disposal costs. They are subsequently carried at the lower of cost or current fair value less estimated disposal costs. Decreases in fair value below cost are recognized as asset-specific valuation allowances which may be reversed when supported by future increases in fair value. Subsequent increases in fair value may be used to reduce the valuation allowance but not below zero. Fair values of real estate are based on “as is” appraisals which are updated at least annually or more frequently for certain asset types or assets located in certain distressed markets. Fair values based on appraisals are generally considered to be based on significant other observable inputs. The Company also considers decreases in listing price and other relevant information in quarterly evaluations and reduces the carrying value of real estate and other repossessed assets when necessary. Fair values based on list prices and other relevant information are generally considered to be based on significant unobservable inputs. Additional costs incurred to complete real estate and other repossessed assets may increase the carrying value, up to current fair value based on “as completed” appraisals. The fair value of mineral rights included in repossessed assets is generally determined by our internal staff of engineers based on projected cash flows from proven oil and gas reserves under existing economic and operating conditions. Proven oil and gas reserves are estimated quantities that geological and engineering data demonstrate, with reasonable certainty, to be recoverable in future years from known reservoirs using existing prices and costs. Projected cash flows incorporate assumptions related to a number of factors including production, sales prices, operating expenses, severance, ad valorem taxes, capital costs and appropriate discount rate. Fair values determined through this process are considered to be based on Level 3 inputs. The value of other repossessed assets is generally determined by our special assets staff based on projected liquidation cash flows under current market conditions. Income generated by these assets is recognized as received. Operating expenses are recognized as incurred. Gains or losses on sales of real estate and other repossessed assets are based on the cash proceeds received less the cost basis of the asset, net of any valuation allowances. The estimated disposal costs of real estate and other repossessed assets are evaluated by the Company on an annual basis based on actual results.
Transfers of Financial Assets [Policy Text Block]	Transfers of Financial Assets BOK Financial regularly transfers financial assets as part of its mortgage banking activities and periodically may transfer other financial assets. Transfers are recorded as sales when the criteria for surrender of control are met. The Company has elected to carry certain residential mortgage loans held for sale at fair value under the fair value option. Changes in fair value are recognized in net income as they occur. These loans are reported separately in the Consolidated Balance Sheets and changes in fair value are recorded in Other Operating Revenue - Mortgage banking revenue in the Consolidated Statements of Earnings. Fair value of conforming residential mortgage loans that will be sold to U.S. government agencies is based on sales commitments or market quotes considered Level 2 inputs. Fair value of mortgage loans that are unable to be sold to U.S. government agencies is based on Level 3 inputs using quoted prices of loans that are sold in securitization transactions with a liquidity discount applied. The fair value is corroborated with an independent third party on at least an annual basis. BOK Financial retains a repurchase obligation under underwriting representations and warranties related to residential mortgage loans transferred and generally retains the right to service the loans. These are not credit obligations. The Company may incur a recourse obligation in limited circumstances. Separate accruals are recognized in Other liabilities in the Consolidated Balance Sheets for repurchase and recourse obligations. These reserves reflect the estimated amount of probable loss the Company will incur as a result of repurchasing a loan, indemnifications, and other settlement resolutions. Repurchases of loans with an origination defect that are also credit impaired are considered collateral dependent and are initially recognized at net realizable value (appraised value less the cost to sell). The difference between unpaid principal balance and net realizable value is not accreted. Repurchases of loans with an origination defect that are not credit impaired are carried at fair value as of the repurchase date. Interest income continues to accrue on these loans and the discount is accreted over the estimated life of the loan. The Company may also choose to purchase GNMA loans once certain mandated delinquency criteria are met. The loans that are eligible and are chosen to be repurchased are initially recognized at fair value based on expected cash flows discounted using the average agency guaranteed debenture rates, average actual principal loss rates and liquidity premium.
Mortgage Servicing Rights [Policy Text Block]	Mortgage Servicing Rights Mortgage servicing rights may be purchased or may be recognized when mortgage loans are originated and sold with servicing rights retained. All mortgage servicing rights are carried at fair value. Changes in the fair value are recognized in earnings as they occur. Mortgage servicing rights are not traded in active markets. A cash flow model is used to determine fair value. Key assumptions and estimates, including projected prepayment speeds and assumed servicing costs, earnings on escrow deposits, ancillary income and discount rates, used by this model are based on current market sources. Assumptions used to value mortgage servicing rights are considered significant unobservable inputs. A separate third-party model is used to estimate prepayment speeds based on interest rates, housing turnover rates, estimated loan curtailment, anticipated defaults and other relevant factors. The prepayment model is updated daily for changes in market conditions and adjusted to better correlate with actual performance of BOK Financial's servicing portfolio. Fair value estimates from outside sources are received at least annually to corroborate the results of the valuation model.
Premises and Equipment [Policy Text Block]	Premises and Equipment Premises and equipment are carried at cost, including capitalized interest when appropriate, less accumulated depreciation and amortization. Depreciation and amortization are computed on a straight-line basis over the estimated useful lives of the assets or, for leasehold improvements, over the shorter of the estimated useful lives or remaining lease terms. Useful lives range from 5 years to 40 years for buildings and improvements, 3 years to 10 years for software and related implementation costs, and 3 years to 10 years for furniture and equipment. Construction in progress represents facilities construction and data processing systems projects underway that have not yet been placed into service. Depreciation and amortization begin once the assets are placed into service. Repair and maintenance costs, including software maintenance and enhancement costs, are charged to expense as incurred. Software licensing costs are generally charged to expense as incurred. Software licensing costs are capitalized if the contractual right to take possession of the software exists and it is feasible to take possession without significant penalty. Capitalized costs are amortized over the shorter of the estimated useful life of the software or remaining contractual life of the license. Premises no longer used by the Company are transferred to real estate and other repossessed assets. The transferred amount is the lower of cost less accumulated depreciation or fair value less estimated disposal costs as of the transfer date. Premises and equipment includes rights to use leased facilities and equipment. Right of use assets are initially measured by the present value of future rent payments over lease terms, adjusted for rent concessions. Rent payments exclude both payments made for non-lease components such as services and variable lease payments other than payments dependent on an index at lease commencement. Lease term includes options reasonably certain to be exercised. The right of use assets and lease liabilities are amortized to achieve straight-line expense over the lease term. Upon lease modification, the right of use asset and liability are reassessed and remeasured. Right of use assets are evaluated for impairment when facts and circumstances change that indicate an impairment may be necessary. Leases less than twelve months are excluded from capitalization. Ongoing technology projects of significant size or length are reviewed at least annually for impairment. Accumulated costs are reviewed for projects or components of projects that do not support the value of the asset being developed. Findings of obsolescence, duplicate effort or other conditions that do not support the recorded value are impaired, with the cost of the impaired components being charged to current-year earnings.
Federal and State Income Taxes [Policy Text Block]	Federal and State Income Taxes Determination of income tax expense and related assets and liabilities is complex and requires estimates and judgments when applying tax laws, rules, regulations and interpretations. It also requires judgments as to future earnings and the timing of future events. Accrued income taxes represent an estimate of net amounts due to or from taxing jurisdictions based upon these estimates, interpretations and judgments. BOK Financial and its subsidiaries file consolidated tax returns. The subsidiaries provide for income taxes on a separate return basis and remit to BOK Financial amounts determined to be currently payable. BOK Financial is an agent for its subsidiaries under the Company's tax sharing agreements and has no ownership rights to any refunds received for the benefit of its subsidiaries. Management evaluates the Company's current tax expense or benefit based upon estimates of taxable income, tax credits and statutory federal and state income tax rates. The amount of current income tax expense or benefit recognized in any period may differ from amounts reported to taxing authorities. Annually, we file tax returns with each jurisdiction where we conduct business and adjust recognized income tax expense or benefit to filed tax returns. We recognize deferred tax assets and liabilities based upon the differences between the values of assets and liabilities as recognized in the financial statements and their related tax basis using enacted tax rates in effect for the year in which the differences are expected to be recovered or settled. The effect of changes in statutory tax rates on the measurement of deferred tax assets and liabilities is recognized through income tax expense in the period the change is enacted. A valuation allowance is provided when it is more likely than not that some portion of the entire deferred tax asset may not be realized. We also recognize the benefit of uncertain tax positions when based upon all relevant evidence, it is more-likely-than-not that our position would prevail upon examination, including resolution of related appeals or litigation, based upon the technical merits of the position. Unrecognized tax benefits, including estimated interest and penalties, are assessed quarterly and are part of our current accrued income tax liability. These may be adjusted through current income tax expense in future periods based on changing facts and circumstances, completion of examinations by taxing authorities or expiration of a statute of limitations.
Employee Benefit Plans [Policy Text Block]	Employee Benefit Plans BOK Financial sponsors a defined contribution plan (“Thrift Plan”) and a defined benefit cash balance pension plan (“Pension Plan”). Employer contributions to the Thrift Plan, which matches employee contributions subject to percentage and years of service limits, are expensed when incurred. Pension Plan costs, which are based upon actuarial computations of current costs, are expensed annually. Pension Plan benefits were curtailed as of April 1, 2006. No participants may be added to the Pension Plan and no additional service benefits will be accrued. BOK Financial recognizes the funded status of its employee benefit plans. Adjustments required to recognize the Pension Plan's net funded status are made through accumulated other comprehensive income, net of deferred income taxes.
Shared-Based Compensation Plans [Policy Text Block]	Share-Based Compensation Plans BOK Financial awards non-vested common shares and stock options as compensation to certain officers. The grant date fair value of non-vested shares is based on the then-current market value of BOK Financial common stock. Non-vested shares generally cliff vest in 3 years and are subject to a holding period after vesting of 2 years. The grant date fair value of stock options is based on the Black-Scholes option pricing model. Stock options generally have graded vesting over 7 years. Each tranche is considered a separate award for valuation and compensation cost recognition. Compensation cost is initially based on the grant date fair value of the award and recognized as expense over the service period, which is generally the vesting period. Expense is reduced for estimated forfeitures over the vesting period and adjusted for actual forfeitures as they occur. Share-based compensation awarded to certain officers has performance conditions that affect the number of awards granted. Compensation cost is adjusted based on the probable outcome of the performance conditions. Restricted stock units ("RSUs") may also be awarded for certain executives who have elected to defer income recognition upon vesting of their awards. RSUs are subject to the same vesting criteria as non-vested shares. Upon vesting and meeting other relevant conditions, RSUs are settled through cash distributions. The value of the awards will vary in amounts equal to changes in the fair value of an equal number of BOK Financial common shares.
Other Operating Revenue [Policy Text Block]	Other Operating Revenue Fees and commissions revenue is generated through the sales of products, consisting primarily of financial instruments, and the performance of services for customers under contractual obligations. Revenue from providing services for customers is recognized at the time services are provided in an amount that reflects the consideration we expect to be entitled to for those services. Revenue is recognized based on the application of five steps: • Identify the contract with a customer • Identify the performance obligations in the contract • Determine the transaction price • Allocate the transaction price to the performance obligations in the contract • Recognize revenue when (or as) the Company satisfies a performance obligation For contracts with multiple performance obligations, individual performance obligations are accounted for separately if the customer can benefit from the good or service on its own or with other resources readily available to the customer and the promise to transfer goods and services to the customer is separately identifiable in the contract. The transaction price is allocated to the performance obligations based on relative standalone selling prices. Revenue is recognized on a gross basis whenever we have primary responsibility and risk in providing the services or products to our customers and have discretion in establishing the price for the services or products. Revenue is recognized on a net basis whenever we act as an agent for products or services of others. Brokerage and trading revenue includes revenues from trading, customer hedging, retail brokerage, investment banking and insurance brokerage. Trading revenue includes net realized and unrealized gains primarily related to sales of securities to institutional customers and related derivative contracts. Customer hedging revenue includes realized and unrealized changes in the fair value of derivative contracts held for customer risk management programs including credit valuation adjustments, as necessary. We offer commodity, interest rate, foreign exchange and equity derivatives to our customers. These customer contracts are offset with contracts with selected counterparties and exchanges to minimize changes in market risk from changes in commodity prices, interest rates or foreign exchange rates. Retail brokerage revenue represents fees and commissions earned on sales of fixed income securities, annuities, mutual funds and other financial instruments to retail customers. Investment banking revenue includes fees earned upon completion of underwriting and financial advisory services. Investment banking revenue also includes fees earned in conjunction with loan syndications. Insurance brokerage revenues represent fees and commissions earned on placement of insurance products with carriers for property and casualty and health coverage Transaction card revenue includes merchant discount fees and electronic funds transfer network fees, net of interchange fees paid to card issuers and assessments paid to card networks. Merchant discount fees represent fees paid by customers for account management and electronic processing of card transactions. Merchant discount fees are recognized at the time the customer’s transactions are processed or other services are performed. The Company also maintains the TransFund electronic funds transfer network for the benefit of its members, which includes BOKF, NA. Electronic funds transfer fees are recognized as electronic transactions are processed on behalf of its members. Fiduciary and asset management revenue includes fees from asset management, custody, recordkeeping, investment advisory and administration services. Revenue is recognized on an accrual basis at the time the services are performed and may be based on either the fair value of the account or the service provided. Deposit service charges and fees include commercial account service charges, overdraft fees, check card fee revenue and automated service charges and other deposit service fees. Fees are recognized at least quarterly in accordance with published deposit account agreements and disclosure statements for retail accounts or contractual agreements for commercial accounts. Item charges for overdraft or non-sufficient funds items are recognized as items are presented for payment. Account balance charges and activity fees are accrued monthly and collected in arrears. Commercial account activity fees may be offset by an earnings credit based on account balances. Check card fees represent interchange fees paid by a merchant bank for transactions processed from cards issued by the Company. Check card fees are recognized when transactions are processed.
Newly Adopted and Pending Accounting Pronouncements [Policy Text Block]	Newly Adopted and Pending Accounting Pronouncements The following is a summary of newly adopted and pending accounting pronouncements that may have a more than insignificant effect on the Company's financial statements. Financial Accounting Standards Board ("FASB") FASB Accounting Standards Update No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Assets Measured at Amortized Cost ("ASU 2016-13") On June 16, 2016, the FASB issued ASU 2016-13 to provide more timely recording of credit losses on loans and other financial assets measured at amortized cost. The Company adopted the new standard January 1, 2020, through a cumulative effect adjustment to retained earnings. Prior periods were not restated. Under ASU 2016-13, acquired loans must be reserved in a manner consistent with originated loans while the incurred loss model excluded purchased loans because the loans had been marked to fair value at acquisition. Under ASU 2016-13, the fair value discount will remain in place and be accreted into interest income over the life of any acquired loans in the portfolio. Another transition adjustment component is related to expected credit losses for residential mortgage loans sold that exceed amounts guaranteed by the U.S. Department of Veterans Affairs as we retain the credit risk for any amounts exceeding the guarantee as well as for recourse loans. Prior to ASU 2016-13, held-to-maturity non-agency securities carried no reserve for credit losses. Note 4 disaggregates the transition adjustment for loans and unfunded loan commitments among portfolio segments as well as on-and off-balance sheet reserves. FASB Accounting Standards Update No. 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting ("ASU 2020-04") On March 12, 2020, the FASB issued ASU 2020-04 which provides optional expedients and exceptions for applying U.S. GAAP to contract modifications and hedging relationships that reference LIBOR or another reference rate expected to be discontinued, subject to meeting certain criteria. Under the new guidance, an entity can elect by accounting topic or industry subtopic to account for the modification of a contract affected by reference rate reform as a continuation of the existing contract, if certain conditions are met. In addition, the new guidance allows an entity to elect on a hedge-by-hedge basis to continue to apply hedge accounting for hedging relationships in which the critical terms change due to reference rate reform, if certain conditions are met. A one-time election to sell and/or transfer held-to-maturity debt securities that reference a rate affected by reference rate reform is also allowed. ASU 2020-04 became effective for all entities as of March 12, 2020 and will apply to all LIBOR reference rate modifications through December 31, 2022. Adoption of ASU 2020-04 did not have a material impact on the Company's financial statements. FASB Accounting Standards Update No. 2021-01, Reference Rate Reform (Topic 848): Scope ("ASU 2021-01") On January 7, 2021, the FASB issued ASU 2021-01 which clarifies that certain optional expedients and exceptions in Topic 848 for contract modifications and hedge accounting apply to derivatives that are affected by the discounting transition. The amendments in this update are elective and apply to all entities that have derivative instruments that use an interest rate for margining, discounting, or contract price alignment that is modified as a result of reference rate reform. The amendments also optionally apply to all entities that designate receive-variable-rate, pay-variable-rate cross-currency interest rate swaps as hedging instruments in net investment hedges that are modified as a result of reference rate reform. ASU 2021-01 is effective immediately for all entities and amendments may be applied on a full retrospective basis as of any date from the beginning of an interim period that includes or is subsequent to March 12, 2020. Adoption of ASU 2021-01 did not have a material impact on the Company's financial statements.

Reclassifications (Policies)

Reclassifications (Policies)	12 Months Ended
	Dec. 31, 2021
Accounting Policies [Abstract]
Reclassifications [Text Block]	Certain prior year amounts have been reclassified to conform to current year presentation.

Securities (Tables)

Securities (Tables)	12 Months Ended
	Dec. 31, 2021
Marketable Securities [Abstract]
Trading Securities [Table Text Block]	The fair value and net unrealized gain (loss) included in trading securities is as follows (in thousands): December 31, 2021 December 31, 2020 Fair Value Net Unrealized Gain (Loss) Fair Value Net Unrealized Gain (Loss) U.S. government securities $ 23,610 $ 40 $ 9,183 $ — Residential agency mortgage-backed securities 9,068,900 (9,338) 4,669,148 (3,624) Municipal securities 25,783 34 19,172 42 Other debt securities 18,520 (26) 10,472 22 Total trading securities $ 9,136,813 $ (9,290) $ 4,707,975 $ (3,560)
Investment Securities (Held-to-Maturity) [Table Text Block]	The amortized cost and fair values of investment securities are as follows (in thousands): December 31, 2021 Amortized Fair Gross Unrealized Cost Value Gain Loss Municipal securities $ 203,772 $ 223,609 $ 19,851 $ (14) Residential agency mortgage-backed securities 6,939 7,500 561 — Other debt securities 288 286 — (2) Total investment securities $ 210,999 $ 231,395 $ 20,412 $ (16) Allowance for credit losses 1 (555) Investment securities, net of allowance $ 210,444 $ 231,395 $ 20,412 $ (16) 1 Effective with the adoption of FASB ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326) on January 1, 2020. December 31, 2020 Amortized Fair Gross Unrealized Cost Value Gain Loss Municipal securities $ 229,245 $ 255,270 $ 26,169 $ (144) Residential agency mortgage-backed securities 8,913 9,790 877 — Other debt securities 7,373 7,371 — (2) Total investment securities $ 245,531 $ 272,431 $ 27,046 $ (146) Allowance for credit losses 1 (688) Investment securities, net of allowance $ 244,843 $ 272,431 $ 27,046 $ (146) 1 Effective with the adoption of FASB ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326) on January 1, 2020. The amortized cost and fair values of investment securities at December 31, 2021, by contractual maturity, are as shown in the following table (dollars in thousands): Less than One to Six to Over Total Weighted Average Maturity 1 Fixed maturity debt securities: Amortized cost $ 21,800 $ 103,923 $ 72,262 $ 6,075 $ 204,060 4.45 Fair value 21,960 117,750 78,053 6,132 223,895 Residential mortgage-backed securities: Amortized cost $ 6,939 2 Fair value 7,500 Total investment securities: Amortized cost $ 210,999 Fair value 231,395 1 Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without penalty. 2 The average expected lives of residential mortgage-backed securities were 4.1 years based upon current prepayment assumptions. Temporarily Impaired Investment Securities (in thousands): December 31, 2021 Number of Securities Less Than 12 Months 12 Months or Longer Total Fair Unrealized Fair Unrealized Fair Unrealized Investment: Municipal securities 1 $ — $ — $ 587 $ 14 $ 587 $ 14 Other debt securities 2 $ 273 $ 2 $ — $ — $ 273 $ 2 Total investment securities 3 $ 273 $ 2 $ 587 $ 14 $ 860 $ 16 December 31, 2020 Number of Securities Less Than 12 Months 12 Months or Longer Total Fair Unrealized Fair Unrealized Fair Unrealized Investment: Municipal securities 6 $ 2,451 $ 40 $ 2,043 $ 104 $ 4,494 $ 144 Other debt securities 2 250 1 25 1 275 2 Total investment securities 8 $ 2,701 $ 41 $ 2,068 $ 105 $ 4,769 $ 146
Available for Sale Securities [Table Text Block]	The amortized cost and fair value of available for sale securities are as follows (in thousands): December 31, 2021 Amortized Fair Gross Unrealized Cost Value Gain Loss U.S. Treasury $ 1,001 $ 1,000 $ — $ (1) Municipal securities 515,551 508,365 1,302 (8,488) Mortgage-backed securities: Residential agency 7,908,587 8,006,616 155,477 (57,448) Residential non-agency 10,625 24,339 13,714 — Commercial agency 4,628,172 4,617,025 36,868 (48,015) Other debt securities 500 472 — (28) Total available for sale securities $ 13,064,436 $ 13,157,817 $ 207,361 $ (113,980) December 31, 2020 Amortized Fair Gross Unrealized Cost Value Gain Loss U.S. Treasury $ 500 $ 508 $ 8 $ — Municipal securities 165,318 167,979 2,666 (5) Mortgage-backed securities: Residential agency 9,019,013 9,340,471 328,183 (6,725) Residential non-agency 17,563 32,770 15,207 — Commercial agency 3,406,956 3,508,465 103,590 (2,081) Other debt securities 500 472 — (28) Total available for sale securities $ 12,609,850 $ 13,050,665 $ 449,654 $ (8,839) The amortized cost and fair values of available for sale securities at December 31, 2021, by contractual maturity, are as shown in the following table (dollars in thousands): Less than One to Six to Over Total Weighted Average Maturity 1 Fixed maturity debt securities: Amortized cost $ 74,454 $ 1,881,944 $ 2,695,022 $ 493,804 $ 5,145,224 6.76 Fair value 74,874 1,898,237 2,657,759 495,992 5,126,862 Residential mortgage-backed securities: Amortized cost $ 7,919,212 2 Fair value 8,030,955 Total available-for-sale securities: Amortized cost $ 13,064,436 Fair value 13,157,817 1 Expected maturities may differ from contractual maturities, because borrowers may have the right to call or prepay obligations with or without penalty. 2 The average expected lives of residential mortgage-backed securities were 3.7 years based upon current prepayment assumptions. Sales of available for sale securities resulted in gains and losses as follows (in thousands): Year Ended December 31, 2021 2020 2019 Proceeds $ 622,881 $ 384,507 $ 1,211,718 Gross realized gains 5,702 9,976 14,996 Gross realized losses (1,998) (66) (9,399) Related federal and state income tax expense 889 2,524 1,425
Debt Securities, Available for Sale, Unrealized Loss Position [Table Text Block]	Temporarily Impaired Available for Sale Securities (In thousands) December 31, 2021 Number of Securities Less Than 12 Months 12 Months or Longer Total Fair Unrealized Fair Unrealized Fair Unrealized Available for sale: U.S. Treasury 1 $ 1,000 $ 1 $ — $ — $ 1,000 $ 1 Municipal securities 175 423,575 7,762 22,476 726 446,051 8,488 Mortgage-backed securities: Residential agency 120 $ 2,382,094 $ 37,121 $ 750,044 $ 20,327 $ 3,132,138 $ 57,448 Commercial agency 165 2,104,689 35,488 703,216 12,527 2,807,905 48,015 Other debt securities 1 — — 472 28 472 28 Total available for sale securities 462 $ 4,911,358 $ 80,372 $ 1,476,208 $ 33,608 $ 6,387,566 $ 113,980 December 31, 2020 Number of Securities Less Than 12 Months 12 Months or Longer Total Fair Unrealized Fair Unrealized Fair Unrealized Available for sale: Municipal securities 1 6,166 5 — — 6,166 5 Mortgage-backed securities: Residential agency 38 $ 786,890 $ 6,605 $ 160,747 $ 120 $ 947,637 $ 6,725 Commercial agency 37 350,506 1,587 277,627 494 628,133 2,081 Other debt securities 1 — — 472 28 472 28 Total available for sale securities 77 $ 1,143,562 $ 8,197 $ 438,846 $ 642 $ 1,582,408 $ 8,839
Fair Value Option Securities [Table Text Block]	The fair value and net unrealized gain (loss) included in fair value option securities is as follows (in thousands): December 31, 2021 December 31, 2020 Fair Value Net Unrealized Gain (Loss) Fair Value Net Unrealized Gain (Loss) Residential agency mortgage-backed securities 43,770 1,591 114,982 4,463

Derivatives (Tables)

Derivatives (Tables)	12 Months Ended
	Dec. 31, 2021
Derivative Instrument Detail [Abstract]
Derivative Contracts [Table Text Block]	The following table summarizes the fair values of derivative contracts recorded as “derivative contracts” assets and liabilities in the balance sheet at December 31, 2021 (in thousands): Assets Notional 1 Gross Fair Value Netting Adjustments Net Fair Value Before Cash Collateral Cash Collateral Fair Value Net of Cash Collateral Customer risk management programs: Interest rate contracts $ 2,614,162 $ 53,881 $ (10,101) $ 43,780 $ — $ 43,780 Energy contracts 6,360,095 1,168,363 (375,624) 792,739 — 792,739 Agricultural contracts — — — — — — Foreign exchange contracts 216,272 215,148 — 215,148 — 215,148 Equity option contracts 42,136 755 — 755 (242) 513 Total customer risk management programs 9,232,665 1,438,147 (385,725) 1,052,422 (242) 1,052,180 Trading 35,592,751 139,694 (104,326) 35,368 (721) 34,647 Interest rate risk management programs 869,506 10,687 (217) 10,470 — 10,470 Total derivative contracts $ 45,694,922 $ 1,588,528 $ (490,268) $ 1,098,260 $ (963) $ 1,097,297 Liabilities Notional¹ Gross Fair Value Netting Adjustments Net Fair Value Before Cash Collateral Cash Collateral Fair Value Net of Cash Collateral Customer risk management programs: Interest rate contracts $ 2,614,162 $ 54,062 $ (10,101) $ 43,961 $ (33,870) $ 10,091 Energy contracts 6,480,840 1,210,946 (375,624) 835,322 (803,102) 32,220 Agricultural contracts — — — — — — Foreign exchange contracts 208,381 207,119 — 207,119 (447) 206,672 Equity option contracts 42,136 755 — 755 — 755 Total customer risk management programs 9,345,519 1,472,882 (385,725) 1,087,157 (837,419) 249,738 Trading 41,285,649 152,947 (104,326) 48,621 (24,074) 24,547 Interest rate risk management programs 298,832 1,557 (217) 1,340 — 1,340 Total derivative contracts $ 50,930,000 $ 1,627,386 $ (490,268) $ 1,137,118 $ (861,493) $ 275,625 1 Notional amounts for commodity contracts are converted into dollar-equivalent amounts based on dollar prices at the inception of the contract. The following table summarizes the fair values of derivative contracts recorded as “derivative contracts” assets and liabilities in the balance sheet at December 31, 2020 (in thousands): Assets Notional 1 Gross Fair Value Netting Adjustments Net Fair Value Before Cash Collateral Cash Collateral Fair Value Net of Cash Collateral Customer risk management programs: Interest rate contracts $ 3,212,469 $ 113,524 $ (144) $ 113,380 $ — $ 113,380 Energy contracts 3,791,565 386,008 (211,468) 174,540 — 174,540 Agricultural contracts 14,765 3,859 — 3,859 — 3,859 Foreign exchange contracts 337,001 332,257 — 332,257 (420) 331,837 Equity option contracts 70,199 1,222 — 1,222 (285) 937 Total customer risk management programs 7,425,999 836,870 (211,612) 625,258 (705) 624,553 Trading 84,997,593 440,627 (240,655) 199,972 (26,958) 173,014 Internal risk management programs 995,123 17,352 (4,231) 13,121 — 13,121 Total derivative contracts $ 93,418,715 $ 1,294,849 $ (456,498) $ 838,351 $ (27,663) $ 810,688 Liabilities Notional¹ Gross Fair Value Netting Adjustments Net Fair Value Before Cash Collateral Cash Collateral Fair Value Net of Cash Collateral Customer risk management programs: Interest rate contracts $ 3,212,469 $ 113,900 $ (144) $ 113,756 $ (104,202) $ 9,554 Energy contracts 3,617,678 361,334 (211,468) 149,866 (114,070) 35,796 Agricultural contracts 14,781 3,844 — 3,844 (3,844) — Foreign exchange contracts 336,223 331,035 — 331,035 (1,165) 329,870 Equity option contracts 70,199 1,222 — 1,222 — 1,222 Total customer risk management programs 7,251,350 811,335 (211,612) 599,723 (223,281) 376,442 Trading 88,929,916 414,801 (240,655) 174,146 (145,692) 28,454 Internal risk management programs 145,256 5,529 (4,231) 1,298 (415) 883 Total derivative contracts $ 96,326,522 $ 1,231,665 $ (456,498) $ 775,167 $ (369,388) $ 405,779 1 Notional amounts for commodity contracts are converted into dollar-equivalent amounts based on dollar prices at the inception of the contract.
Derivative Instruments, Gain (Loss) in Statement of Earnings [Table Text Block]	The following summarizes the pre-tax net gains (losses) on derivative instruments and where they are recorded in the Consolidated Statements of Earnings (in thousands): Year Ended December 31, 2021 2020 2019 Brokerage Gain (Loss) Brokerage Gain (Loss) Brokerage Gain (Loss) Customer risk management programs: Interest rate contracts To-be-announced U.S. agency residential mortgage-backed securities 1 $ — $ — $ — $ — $ 9,579 $ — Interest rate swaps 5,503 — 4,507 — 3,647 — Energy contracts 14,190 — 17,287 — 5,064 — Agricultural contracts 27 — 34 — 28 — Foreign exchange contracts 712 — 921 — 623 — Equity option contracts — — — — — — Total customer risk management programs 20,432 — 22,749 — 18,941 — Trading 2 (11,453) — 8,255 — 13,999 — Internal risk management programs — (19,378) — 42,320 — 14,951 Total derivative contracts $ 8,979 $ (19,378) $ 31,004 $ 42,320 $ 32,940 $ 14,951

Loans and Allowances for Cred_2

Loans and Allowances for Credit Losses (Tables)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Loans and Leases Receivable, Net Amount [Abstract]
Schedule of the Loans by Portfolio Segment [Table Text Block]	The portfolio segments of the loan portfolio are as follows (in thousands): December 31, 2021 December 31, 2020 Fixed Variable Non-accrual Total Fixed Variable Non-accrual Total Commercial $ 3,360,117 $ 9,072,244 $ 74,104 $ 12,506,465 $ 3,174,203 $ 9,736,173 $ 167,159 $ 13,077,535 Commercial real estate 929,015 2,888,048 14,262 3,831,325 1,047,486 3,623,806 27,246 4,698,538 Paycheck protection program 276,341 — — 276,341 1,682,310 — — 1,682,310 Loans to individuals 2,037,792 1,508,064 45,693 3,591,549 2,174,874 1,333,975 40,288 3,549,137 Total $ 6,603,265 $ 13,468,356 $ 134,059 $ 20,205,680 $ 8,078,873 $ 14,693,954 $ 234,693 $ 23,007,520 Foregone interest on nonaccrual loans $ 14,102 $ 22,870
Rollforward of Allowance For Loan Losses And Accrual for Off-Balnace Sheet Credit Losses [Table Text Block]	The activity in the allowance for loan losses and the allowance for off-balance sheet credit losses related to loan commitments and standby letters of credit for the year ended December 31, 2021 is summarized as follows (in thousands): Commercial Commercial Real Estate Paycheck Loans to Nonspecific Allowance Total Allowance for loan losses: Beginning balance, adjusted 254,934 86,558 — 47,148 — 388,640 Provision for loan losses (59,326) (26,522) — (9,354) — (95,202) Loans charged off (43,956) (2,485) — (4,910) — (51,351) Recoveries of loans previously charged off 10,404 1,002 — 2,928 — 14,334 Ending balance $ 162,056 $ 58,553 $ — $ 35,812 $ — $ 256,421 Allowance for off-balance sheet credit risk from unfunded loan commitments: Beginning balance, adjusted 14,422 20,571 — 1,928 — 36,921 Provision for off-balance sheet credit risk (610) (3,129) — (205) — (3,944) Ending balance $ 13,812 $ 17,442 $ — $ 1,723 $ — $ 32,977 Changes in our reasonable and supportable forecasts of macroeconomic variables, primarily due to the anticipated impact of the on-going COVID-19 pandemic, and other assumptions, resulted in a $90.1 million decrease in the allowance for lending activities during the year ended December 31, 2021. Changes in the loan portfolio characteristics, including specific impairment and losses, loan balances and risk grading resulted in a $9.0 million decrease in the allowance for lending activities. The activity in the allowance for loan losses and the allowance for off-balance sheet credit losses related to loan commitments and standby letters of credit for the year ended December 31, 2020 is summarized as follows (in thousands): Commercial Commercial Real Estate Paycheck Loans to Nonspecific Allowance Total Allowance for loan losses: Beginning balance $ 118,187 $ 51,805 $ — $ 23,572 $ 17,195 $ 210,759 Transition adjustment 33,681 (4,620) — 13,943 (17,195) 25,809 Beginning balance, adjusted 151,868 47,185 — 37,515 — 236,568 Provision for loan losses 171,800 40,407 — 10,253 — 222,460 Loans charged off (73,370) (1,300) — (4,729) — (79,399) Recoveries of loans previously charged off 4,636 266 — 4,109 — 9,011 Ending balance $ 254,934 $ 86,558 $ — $ 47,148 $ — $ 388,640 Allowance for off-balance sheet credit risk from unfunded loan commitments: Beginning balance $ 1,434 $ 107 $ — $ 44 $ — $ 1,585 Transition adjustment 10,144 11,660 — 1,748 — 23,552 Beginning balance, adjusted 11,578 11,767 — 1,792 — 25,137 Provision for off-balance sheet credit risk 2,844 8,804 — 136 — 11,784 Ending balance $ 14,422 $ 20,571 $ — $ 1,928 $ — $ 36,921 The allowance for loan losses and recorded investment of the related loans by portfolio segment for each impairment measurement method at December 31, 2021 is as follows (in thousands): Collectively Measured Individually Measured Total Recorded Investment Related Allowance Recorded Investment Related Allowance Recorded Investment Related Commercial $ 12,432,361 $ 158,063 $ 74,104 $ 3,993 $ 12,506,465 $ 162,056 Commercial real estate 3,817,063 56,204 14,262 2,349 3,831,325 58,553 Paycheck protection program 276,341 — — — 276,341 — Loans to individuals 3,545,856 35,812 45,693 — 3,591,549 35,812 Total $ 20,071,621 $ 250,079 $ 134,059 $ 6,342 $ 20,205,680 $ 256,421 The allowance for loan losses and recorded investment of the related loans by portfolio segment for each impairment measurement method at December 31, 2020 is as follows (in thousands): Collectively Measured Individually Measured Total Recorded Investment Related Allowance Recorded Investment Related Allowance Recorded Investment Related Commercial $ 12,910,376 $ 235,882 $ 167,159 $ 19,052 $ 13,077,535 $ 254,934 Commercial real estate 4,671,292 83,169 27,246 3,389 4,698,538 86,558 Paycheck protection program 1,682,310 — — — 1,682,310 — Loans to individuals 3,508,849 47,148 40,288 — 3,549,137 47,148 Total $ 22,772,827 $ 366,199 $ 234,693 $ 22,441 $ 23,007,520 $ 388,640	The activity in the allowance for loan losses and the allowance for off-balance sheet credit losses related to loan commitments and standby letters of credit is for the year ended December 31, 2019 summarized as follows (in thousands): Commercial Commercial Real Estate Residential Mortgage Personal Nonspecific Allowance Total Allowance for loan losses: Beginning balance $ 102,226 $ 60,026 $ 17,964 $ 9,473 $ 17,768 $ 207,457 Provision for loan losses 57,125 (12,046) (3,838) 3,537 (573) 44,205 Loans charged off (43,185) (1,161) (288) (6,343) — (50,977) Recoveries 2,021 4,986 562 2,505 — 10,074 Ending balance $ 118,187 $ 51,805 $ 14,400 $ 9,172 $ 17,195 $ 210,759 Allowance for off-balance sheet credit losses: Beginning balance 1,655 52 52 31 — 1,790 Provision for off-balance sheet credit losses (221) 55 (8) (31) — (205) Ending balance $ 1,434 $ 107 $ 44 $ — $ — $ 1,585 Total provision for credit losses $ 56,904 $ (11,991) $ (3,846) $ 3,506 $ (573) $ 44,000
Schedule of Credit Quality Indicators [Table Text Block]	Origination Year 2021 2020 2019 2018 2017 Prior Revolving Loans Revolving Loans Converted to Term Loans Total Commercial: Energy Pass $ 252,133 $ 29,556 $ 15,914 $ 13,548 $ 4,741 $ 6,765 $ 2,540,525 $ — $ 2,863,182 Special Mention 558 771 — — — — 750 — 2,079 Accruing Substandard 10,650 22,611 1,185 814 — 716 74,556 — 110,532 Nonaccrual — 20,487 — — — 714 9,890 — 31,091 Total energy 263,341 73,425 17,099 14,362 4,741 8,195 2,625,721 — 3,006,884 Healthcare Pass 563,800 589,193 516,558 498,998 319,096 688,136 160,154 26 3,335,961 Special Mention 6,835 — 15,583 — 11,135 — 5 — 33,558 Accruing Substandard — — 27,135 543 — 1,981 — — 29,659 Nonaccrual — — — 6,542 — 8,711 509 — 15,762 Total healthcare 570,635 589,193 559,276 506,083 330,231 698,828 160,668 26 3,414,940 Services Pass 696,149 405,057 289,375 275,010 225,404 795,029 607,958 375 3,294,357 Special Mention 434 405 1,830 1,047 3,290 47 17,210 192 24,455 Accruing Substandard 43 530 4,166 10,714 1,785 2,366 11,607 — 31,211 Nonaccrual — — — 230 13,918 2,519 503 — 17,170 Total services 696,626 405,992 295,371 287,001 244,397 799,961 637,278 567 3,367,193 General business Pass 584,438 211,892 264,462 177,384 168,977 215,014 1,047,420 2,284 2,671,871 Special Mention 218 223 60 1,435 3,842 — 5,875 — 11,653 Accruing Substandard 265 1,066 1,634 7,697 8,336 3,024 1,821 — 23,843 Nonaccrual — 2,444 4,562 1,046 762 518 730 19 10,081 Total general business 584,921 215,625 270,718 187,562 181,917 218,556 1,055,846 2,303 2,717,448 Total commercial 2,115,523 1,284,235 1,142,464 995,008 761,286 1,725,540 4,479,513 2,896 12,506,465 Commercial real estate: Pass 717,400 711,231 871,283 403,115 279,058 664,684 117,847 31 3,764,649 Special Mention — — — 6,660 10,898 9,244 — — 26,802 Accruing Substandard — — — 13,352 4,480 7,780 — — 25,612 Nonaccrual — — 8,076 — — 6,186 — — 14,262 Total commercial real estate 717,400 711,231 879,359 423,127 294,436 687,894 117,847 31 3,831,325 Origination Year 2021 2020 2019 2018 2017 Prior Revolving Loans Revolving Loans Converted to Term Loans Total Paycheck protection program: Pass 237,357 38,984 — — — — — — 276,341 Total paycheck protection program 237,357 38,984 — — — — — — 276,341 Loans to individuals: Residential mortgage Pass 386,092 452,537 84,001 60,390 68,150 295,632 320,638 21,463 1,688,903 Special Mention — — 156 — 19 411 282 159 1,027 Accruing Substandard 98 — — — 127 41 400 — 666 Nonaccrual 1,516 1,809 383 1,968 629 22,289 2,177 803 31,574 Total residential mortgage 387,706 454,346 84,540 62,358 68,925 318,373 323,497 22,425 1,722,170 Residential mortgage guaranteed by U.S. government agencies Pass 699 11,380 20,650 27,970 32,742 246,871 — — 340,312 Nonaccrual — — 1,259 821 635 11,146 — — 13,861 Total residential mortgage guaranteed by U.S. government agencies 699 11,380 21,909 28,791 33,377 258,017 — — 354,173 Personal: Pass 218,960 180,577 177,389 70,249 92,592 135,041 638,713 728 1,514,249 Special Mention — 9 34 3 — 47 — — 93 Accruing Substandard 435 5 165 — — 1 — — 606 Nonaccrual 110 14 10 24 35 40 25 — 258 Total personal 219,505 180,605 177,598 70,276 92,627 135,129 638,738 728 1,515,206 Total loans to individuals 607,910 646,331 284,047 161,425 194,929 711,519 962,235 23,153 3,591,549 Total loans $ 3,678,190 $ 2,680,781 $ 2,305,870 $ 1,579,560 $ 1,250,651 $ 3,124,953 $ 5,559,595 $ 26,080 $ 20,205,680 The following table summarizes the Company's loan portfolio at December 31, 2020 by the risk grade categories and vintage (in thousands): Origination Year 2020 2019 2018 2017 2016 Prior Revolving Loans Revolving Loans Converted to Term Loans Total Commercial: Energy Pass $ 112,614 $ 51,863 $ 89,346 $ 7,178 $ 1,148 $ 7,956 $ 2,548,663 $ — $ 2,818,768 Special Mention — — — — — — 202,590 — 202,590 Accruing Substandard 24,000 1,363 1,453 — 12,667 — 283,294 — 322,777 Nonaccrual 21,076 2,607 — — — 21,064 80,312 — 125,059 Total energy 157,690 55,833 90,799 7,178 13,815 29,020 3,114,859 — 3,469,194 Healthcare Pass 536,745 615,221 638,302 422,834 234,399 658,286 147,132 — 3,252,919 Special Mention — 27,500 — — — 8,282 5 — 35,787 Accruing Substandard — — 1,191 929 132 11,387 — — 13,639 Nonaccrual — 18 183 — — 2,935 509 — 3,645 Total healthcare 536,745 642,739 639,676 423,763 234,531 680,890 147,646 — 3,305,990 Services Pass 534,853 436,384 372,867 307,374 373,785 683,936 665,491 682 3,375,372 Special Mention 150 9,057 389 291 2,038 2,000 3,063 — 16,988 Accruing Substandard 429 6,380 26,008 6,027 5,030 7,954 38,797 — 90,625 Nonaccrual 4,833 448 — 12,590 1,049 6,138 540 — 25,598 Total services 540,265 452,269 399,264 326,282 381,902 700,028 707,891 682 3,508,583 General business Pass 419,756 394,985 310,273 236,222 103,987 186,600 1,055,878 2,316 2,710,017 Special Mention 197 4,519 9,713 7,803 2,511 3,159 2,483 19 30,404 Accruing Substandard 1,432 3,069 6,694 10,935 10,042 3,729 4,449 140 40,490 Nonaccrual 1,675 3,728 4,863 1,436 530 107 477 41 12,857 Total general business 423,060 406,301 331,543 256,396 117,070 193,595 1,063,287 2,516 2,793,768 Total commercial 1,657,760 1,557,142 1,461,282 1,013,619 747,318 1,603,533 5,033,683 3,198 13,077,535 Commercial real estate: Pass 725,577 1,211,338 954,226 489,193 314,899 722,475 223,131 38 4,640,877 Special Mention — — 259 12,311 2,725 5,831 — — 21,126 Accruing Substandard — — — 4,410 — 4,852 27 — 9,289 Nonaccrual — 8,300 — 232 7,468 11,246 — — 27,246 Total commercial real estate 725,577 1,219,638 954,485 506,146 325,092 744,404 223,158 38 4,698,538 Origination Year 2020 2019 2018 2017 2016 Prior Revolving Loans Revolving Loans Converted to Term Loans Total Paycheck protection program: Pass 1,682,310 — — — — — — — 1,682,310 Total paycheck protection program 1,682,310 — — — — — — — 1,682,310 Loans to individuals: Residential mortgage Pass 564,325 149,832 120,875 124,930 158,801 348,292 335,259 24,553 1,826,867 Special Mention 33 11 2,094 — 59 318 950 10 3,475 Accruing Substandard — — 51 — — 34 272 76 433 Nonaccrual 648 104 1,658 784 2,010 22,415 3,835 774 32,228 Total residential mortgage 565,006 149,947 124,678 125,714 160,870 371,059 340,316 25,413 1,863,003 Residential mortgage guaranteed by U.S. government agencies Pass 4,859 33,880 34,464 43,099 58,264 226,380 — — 400,946 Nonaccrual — — 545 — 309 6,887 — — 7,741 Total residential mortgage guaranteed by U.S. government agencies 4,859 33,880 35,009 43,099 58,573 233,267 — — 408,687 Personal: Pass 219,873 200,580 76,246 100,229 64,104 102,126 510,571 1,510 1,275,239 Special Mention 39 55 66 — 469 31 965 — 1,625 Accruing Substandard 11 214 10 — — — 29 — 264 Nonaccrual 28 17 57 73 50 49 45 — 319 Total personal 219,951 200,866 76,379 100,302 64,623 102,206 511,610 1,510 1,277,447 Total loans to individuals 789,816 384,693 236,066 269,115 284,066 706,532 851,926 26,923 3,549,137 Total loans $ 4,855,463 $ 3,161,473 $ 2,651,833 $ 1,788,880 $ 1,356,476 $ 3,054,469 $ 6,108,767 $ 30,159 $ 23,007,520
Financing Receivable, Nonaccrual [Table Text Block]	A summary of nonaccruing loans as of December 31, 2021 follows (in thousands): Total With No With Allowance Related Allowance Commercial: Energy $ 31,091 $ 31,091 $ — $ — Healthcare 15,762 9,679 6,083 53 Services 17,170 13,686 3,484 2,584 General business 10,081 7,690 2,391 1,357 Total commercial 74,104 62,146 11,958 3,994 Commercial real estate 14,262 6,186 8,076 2,349 Loans to individuals: Residential mortgage 31,574 31,574 — — Residential mortgage guaranteed by U.S. government agencies 13,861 13,861 — — Personal 258 258 — — Total loans to individuals 45,693 45,693 — — Total $ 134,059 $ 114,025 $ 20,034 $ 6,343 A summary of nonaccruing loans as of December 31, 2020 follows (in thousands): Total With No With Allowance Related Allowance Commercial: Energy $ 125,059 $ 76,633 $ 48,426 $ 16,478 Healthcare 3,645 3,645 — — Services 25,598 20,810 4,788 2,574 General business 12,857 12,857 — — Total commercial 167,159 113,945 53,214 19,052 Commercial real estate 27,246 13,645 13,601 3,389 Loans to individuals: Residential mortgage 32,228 32,228 — — Residential mortgage guaranteed by U.S. government agencies 7,741 7,741 — — Personal 319 319 — — Total loans to individuals 40,288 40,288 — — Total $ 234,693 $ 167,878 $ 66,815 $ 22,441
Summary of Loans by Aging Status [Table Text Block]	A summary of loans currently performing and past due as of December 31, 2021 is as follows (in thousands): Past Due Current 30 to 59 60 to 89 90 Days Total Past Due 90 Days or More and Accruing Commercial: Energy $ 3,002,623 $ 545 3,716 $ — $ 3,006,884 $ — Healthcare 3,412,072 2,359 — 509 3,414,940 — Services 3,352,639 920 4,620 9,014 3,367,193 — General business 2,705,596 6,080 997 4,775 2,717,448 199 Total commercial 12,472,930 9,904 9,333 14,298 12,506,465 199 Commercial real estate 3,827,962 — 206 3,157 3,831,325 — Paycheck protection program 276,341 — — — 276,341 74 Loans to individuals Permanent mortgage 1,707,654 6,263 1,556 6,697 1,722,170 — Permanent mortgages guaranteed by U.S. government agencies 181,022 26,869 16,751 129,531 354,173 118,819 Personal 1,514,938 66 24 178 1,515,206 40 Total loans to individuals 3,403,614 33,198 18,331 136,406 3,591,549 118,859 Total $ 19,980,847 $ 43,102 $ 27,870 $ 153,861 $ 20,205,680 $ 119,132 A summary of loans currently performing and past due as of December 31, 2020 is as follows (in thousands): Past Due Current 30 to 59 60 to 89 90 Days Total Past Due 90 Days or More and Accruing Commercial: Energy $ 3,410,995 $ 12,735 4,050 $ 41,414 $ 3,469,194 $ — Healthcare 3,302,345 — — 3,645 3,305,990 — Services 3,489,423 3,278 177 15,705 3,508,583 326 General business 2,776,038 1,206 6,277 10,247 2,793,768 4,495 Total commercial 12,978,801 17,219 10,504 71,011 13,077,535 4,821 Commercial real estate 4,672,279 276 5,310 20,673 4,698,538 5,126 Paycheck protection program 1,682,310 — — — 1,682,310 — Loans to individuals Permanent mortgage 1,849,304 5,812 837 7,050 1,863,003 181 Permanent mortgages guaranteed by U.S. government agencies 262,102 41,389 22,041 83,155 408,687 78,349 Personal 1,273,702 3,317 90 338 1,277,447 241 Total loans to individuals 3,385,108 50,518 22,968 90,543 3,549,137 78,771 Total $ 22,718,498 $ 68,013 $ 38,782 $ 182,227 $ 23,007,520 $ 88,718

Premises and Equipment and Le_2

Premises and Equipment and Leases Premises and Equipment and Leases (Tables)	12 Months Ended
	Dec. 31, 2021
Property, Plant and Equipment [Abstract]
Premises and Equipment [Table Text Block]	Premises and equipment at December 31 are summarized as follows (in thousands): December 31, 2021 2020 Land $ 69,776 $ 69,776 Buildings and improvements 472,450 440,528 Software and related integration 159,063 120,444 Furniture and equipment 186,092 165,344 Construction in progress 36,917 46,949 Premises and equipment 924,298 843,041 Less accumulated depreciation 350,150 291,733 Premises and equipment, net of accumulated depreciation $ 574,148 $ 551,308

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Finite-Lived Intangible Assets [Table Text Block]	The following table presents the original cost and accumulated amortization of intangible assets (in thousands): Dec. 31, 2021 2020 Core deposit premiums $ 103,200 $ 103,200 Less accumulated amortization 44,149 32,256 Net core deposit premiums 59,051 70,944 Other identifiable intangible assets 78,154 82,731 Less accumulated amortization 45,427 40,239 Net other identifiable intangible assets 32,727 42,492 Total intangible assets, net $ 91,778 $ 113,436
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	Expected amortization expense for intangible assets that will continue to be amortized (in thousands): Core Other Total 2022 $ 10,981 $ 4,665 $ 15,646 2023 10,145 3,625 13,770 2024 9,379 2,611 11,990 2025 8,675 2,201 10,876 2026 7,986 1,828 9,814 Thereafter 11,885 17,797 29,682 $ 59,051 $ 32,727 $ 91,778
Schedule of Goodwill [Table Text Block]	The changes in the carrying value of goodwill by operating segment are as follows (in thousands): Commercial Banking Consumer Banking Wealth Funds Management and Other Total Balance, December 31, 2019 $ 913,931 $ 43,458 $ 90,702 $ — $ 1,048,091 Balance, December 31, 2020 913,931 43,458 90,702 — 1,048,091 Sale of consolidated merchant banking investment during 2021 (3,342) — — — (3,342) Balance, December 31, 2021 $ 910,589 $ 43,458 $ 90,702 $ — $ 1,044,749

Mortgage Banking Activities (Ta

Mortgage Banking Activities (Tables)	12 Months Ended
	Dec. 31, 2021
Mortgage Banking [Abstract]
Components of Residential Mortgage Loans Held For Sale [Table Text Block]	The unpaid principal balance of residential mortgage loans held for sale, notional amounts of derivative contracts related to residential mortgage loan commitments and forward contract sales and their related fair values included in Mortgage loans held for sale on the Consolidated Balance Sheets were (in thousands): December 31, 2021 December 31, 2020 Unpaid Principal Balance/ Fair Value Unpaid Principal Balance/ Fair Value Residential mortgage loans held for sale $ 182,710 $ 186,175 $ 227,161 $ 236,444 Residential mortgage loan commitments 171,412 6,167 380,637 20,435 Forward sales contracts 328,433 (47) 549,414 (4,563) $ 192,295 $ 252,316 No residential mortgage loans held for sale were 90 days or more past due or considered impaired as of December 31, 2021 or December 31, 2020. No credit losses were recognized on residential mortgage loans held for sale for the years ended December 31, 2021, 2020 and 2019.
Mortgage Banking Revenue [Table Text Block]	Mortgage banking revenue was as follows (in thousands): Year Ended 2021 2020 2019 Production revenue: Net realized gains on sales of mortgage loans $ 76,282 $ 107,847 $ 39,730 Net change in unrealized gain on mortgage loans held for sale (5,818) 6,697 672 Net change in the fair value of mortgage loan commitments (14,268) 15,202 (145) Net change in the fair value of forward sales contracts 4,516 (3,898) 2,463 Total mortgage production revenue 60,712 125,848 42,720 Servicing revenue 45,184 56,512 64,821 Total mortgage banking revenue $ 105,896 $ 182,360 $ 107,541
Summary of Mortgage Servicing Rights [Table Text Block]	The following represents a summary of mortgage servicing rights (Dollars in thousands): December 31, 2021 2020 2019 Number of residential mortgage loans serviced for others 102,008 106,201 126,828 Outstanding principal balance of residential mortgage loans serviced for others $ 16,442,446 $ 16,228,449 $ 20,727,106 Weighted average interest rate 3.58 % 3.84 % 3.98 % Remaining contractual term (in months) 281 280 289
Activity in Capitalized Mortgage Servicing Rights [Table Text Block]	Activity in capitalized mortgage servicing rights during the three years ended December 31, 2021 is as follows (in thousands): Balance, December 31, 2018 $ 259,254 Additions 35,128 Change in fair value due to loan runoff (38,979) Change in fair value due to market changes (53,517) Balance, December 31, 2019 201,886 Additions 31,209 Disposals (10,801) Change in fair value due to loan runoff (41,598) Change in fair value due to market changes (79,524) Balance, December 31, 2020 101,172 Additions 31,132 Acquisitions 28,018 Change in fair value due to loan runoff (38,761) Change in fair value due to market changes 41,637 Balance, December 31, 2021 $ 163,198
Assumptions to Value Mortgage Servicing Rights [Table Text Block]	Significant assumptions used to determine fair value considered to be significant unobservable inputs were as follows: December 31, 2021 2020 Discount rate – risk-free rate plus a market premium 8.39% 9.14% Prepayment rate - based upon loan interest rate, original term and loan type 12.11% 19.73% Loan servicing costs – annually per loan based upon loan type: Performing loans $69 - $94 $69 - $94 Delinquent loans $150 - $500 $150 - $500 Loans in foreclosure $1,000 - $4,000 $1,000 - $4,000 Primary/secondary mortgage rate spread 105 bps 105 bps Escrow earnings rate – indexed to rates paid on deposit accounts with comparable average life 1.32% 0.43% Delinquency rate 2.05% 3.54%

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2021
Deposits [Abstract]
Interest Expense on Deposits Disclosure [Table Text Block]	Interest expense on deposits is summarized as follows (in thousands): Year Ended December 31, 2021 2020 2019 Transaction deposits $ 21,961 $ 60,424 $ 132,854 Savings 374 385 677 Time: Certificates of deposits under $100,000 2,961 6,741 8,299 Certificates of deposits $100,000 and over 4,719 18,270 29,288 Other time deposits 3,469 4,176 4,420 Total time 11,149 29,187 42,007 Total $ 33,484 $ 89,996 $ 175,538

Other Borrowed Funds Other Borr

Other Borrowed Funds Other Borrowed Funds (Tables)	12 Months Ended
	Dec. 31, 2021
Debt Disclosure [Abstract]
Schedule of Other Borrowed Funds [Table Text Block]	Information relating to other borrowings is summarized as follows (dollars in thousands): As of Year Ended December 31, 2021 December 31, 2021 Balance Rate Average Balance Rate Maximum Funds purchased $ 199,513 0.05 % $ 543,183 0.46 % $ 542,465 Repurchase agreements 2,126,936 0.08 % 1,695,519 0.33 % 2,920,728 Other borrowings: Federal Home Loan Bank advances — — % 1,679,315 0.27 % 2,600,000 GNMA repurchase liability 7,420 4.36 % 11,956 4.06 % 23,856 Paycheck protection program liquidity facility — — % 879,145 0.35 % 1,662,598 Other 29,333 3.23 % 29,445 4.18 % 31,875 Total other borrowings 36,753 2,599,861 0.38 % Subordinated debentures 1 131,226 3.95 % 224,058 4.70 % 276,049 Total other borrowed funds $ 2,494,428 $ 5,062,621 0.56 % As of Year Ended December 31, 2020 December 31, 2020 Balance Rate Average Balance Rate Maximum Funds purchased $ 769,365 0.05 % $ 2,045,795 0.58 % $ 3,311,938 Repurchase agreements 893,021 0.09 % 1,589,746 0.24 % 3,230,097 Other borrowings: Federal Home Loan Bank advances 200,000 0.29 % 3,393,989 1.00 % 7,500,000 GNMA repurchase liability 19,500 4.35 % 42,771 4.18 % 126,569 Federal Reserve Bank advances — — % 42,464 0.26 % — Paycheck protection program liquidity facility 1,635,963 0.35 % 1,152,073 0.35 % 2,013,414 Other 27,507 5.24 % 28,156 5.12 % 49,376 Total other borrowings 1,882,970 4,659,453 0.88 % Subordinated debentures 1 276,005 4.72 % 275,965 5.05 % 276,005 Total other borrowed funds $ 3,821,361 $ 8,570,959 0.82 % As of Year Ended December 31, 2019 December 31, 2019 Balance Rate Average Balance Rate Maximum Funds purchased $ 3,390,528 1.53 % $ 2,438,376 2.08 % $ 3,390,528 Repurchase agreements 427,822 0.50 % 399,785 0.57 % 427,822 Other borrowings: Federal Home Loan Bank advances 4,500,000 1.79 % 7,122,466 2.44 % 8,000,000 GNMA repurchase liability 15,417 4.32 % 13,746 4.47 % 19,581 Other 11,638 5.09 % 11,144 5.30 % 34,676 Total other borrowings 4,527,055 7,147,356 2.45 % Subordinated debentures 1 275,923 5.15 % 276,075 5.47 % 275,923 Total other borrowed funds $ 8,621,328 $ 10,261,592 2.37 %
Schedule of Maturities of Other Borrowed Funds [Table Text Block]	Aggregate annual principal repayments at December 31, 2021 are as follows (in thousands): 2022 $ 2,343,341 2023 3,378 2024 3,498 2025 3,622 2026 3,752 Thereafter 136,837 Total $ 2,494,428
Schedule of Repurchase Agreements [Table Text Block]	Additional information relating to securities sold under agreements to repurchase and related liabilities at December 31, 2021 and 2020 is as follows (dollars in thousands): December 31, 2021 Amortized Fair Repurchase Security Sold/Maturity Cost Value Liability 1 Rate U.S. government agency mortgage-backed securities: Overnight 1 $ 907,154 $ 902,507 $ 884,936 0.08 % Less than 30 days 2 N/A 1,242,000 1,242,000 1.50 % Total Agency Securities $ 907,154 $ 2,144,507 $ 2,126,936 1.58 % December 31, 2020 Amortized Fair Repurchase Security Sold/Maturity Cost Value Liability 1 Rate U.S. government agency mortgage-backed securities: Overnight 1 $ 893,069 $ 910,885 $ 893,021 0.09 % Less than 30 days — — — — % Total Agency Securities $ 893,069 $ 910,885 $ 893,021 0.09 % 1 BOK Financial maintains control over the securities underlying overnight repurchase agreements and generally transfers control over securities underlying longer-term dealer repurchase agreements to the respective counterparty. 2 Trading position.

Federal and State Income Taxes

Federal and State Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. Significant components of deferred tax assets and liabilities are as follows (in thousands): December 31, 2021 2020 Deferred tax assets: Credit loss reserves $ 67,339 $ 101,265 Lease liability 48,457 44,794 Deferred compensation 33,945 29,504 Unearned fees 11,368 14,584 Purchased loan discount 7,498 11,537 Share-based compensation 5,989 6,525 Valuation adjustments 1,883 3,834 Other 28,958 29,963 Total deferred tax assets 205,437 242,006 Deferred tax liabilities: Available for sale securities mark to market 21,841 105,769 Right-of-use asset 41,291 38,635 Mortgage servicing rights 31,703 24,182 Acquired identifiable intangible 14,307 18,138 Depreciation 10,939 13,754 Lease financing 11,120 11,828 Other 39,698 39,210 Total deferred tax liabilities 170,899 251,516 Net deferred tax assets (liabilities) $ 34,538 $ (9,510)
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	The significant components of the provision for income taxes attributable to continuing operations for BOK Financial are shown below (in thousands): Year Ended December 31, 2021 2020 2019 Current income tax expense: Federal $ 121,196 $ 173,888 $ 110,887 State 21,065 29,889 15,088 Total current income tax expense 142,261 203,777 125,975 Deferred income tax expense (benefit): Federal 29,777 (65,989) 3,416 State 7,737 (8,995) 792 Total deferred income tax expense (benefit) 37,514 (74,984) 4,208 Total income tax expense $ 179,775 $ 128,793 $ 130,183
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	The reconciliations of income attributable to continuing operations at the U.S. federal statutory tax rate to income tax expense are as follows (in thousands): Year Ended December 31, 2021 2020 2019 Amount: Federal statutory tax $ 167,181 $ 118,412 $ 132,482 Tax exempt revenue (6,084) (7,035) (12,227) Effect of state income taxes, net of federal benefit 22,489 14,251 12,715 Utilization of tax credits, net of proportional amortization of low-income housing limited partnership investments (8,801) (6,994) (5,127) Other, net 4,990 10,159 2,340 Total income tax expense $ 179,775 $ 128,793 $ 130,183 Year Ended December 31, 2021 2020 2019 Percent of pretax income: Federal statutory tax 21.0 % 21.0 % 21.0 % Tax exempt revenue (0.7) (1.2) (1.9) Effect of state income taxes, net of federal benefit 2.8 2.5 2.0 Utilization of tax credits, net of proportional amortization of low-income housing limited partnership investments (1.1) (1.2) (0.8) Other, net 0.6 1.7 0.3 Total 22.6 % 22.8 % 20.6 %
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]	A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands): 2021 2020 2019 Balance as of January 1 $ 22,902 $ 20,465 $ 18,869 Additions for tax for current year positions 3,961 6,384 5,649 Settlements during the period (1,754) — — Lapses of applicable statute of limitations (4,017) (3,947) (4,053) Balance as of December 31 $ 21,092 $ 22,902 $ 20,465

Employee Benefits (Tables)

Employee Benefits (Tables)	12 Months Ended
	Dec. 31, 2021
Retirement Benefits [Abstract]
Valuation assumptions used [Table Text Block]	2021 2020 Discount rate 1.73 % 2.69 % Expected return on plan assets 5.50 % 5.50 %

Share-Based Compensation Plans

Share-Based Compensation Plans (Tables)	12 Months Ended
	Dec. 31, 2021
Share-based Payment Arrangement [Abstract]
Schedule of Nonvested Share Activity [Table Text Block]	The following represents a summary of the non-vested shares for the three years ended December 31, 2021 (in thousands): Restricted Stock Restricted Stock Units Shares Weighted Units Weighted Non-vested at January 1, 2019 527,607 — Granted 145,724 $ 76.74 46,689 $ 87.40 Vested (114,201) 61.28 — — Forfeited (131,952) 83.69 — — Non-vested at December 31, 2019 427,178 46,689 Granted 236,750 $ 83.49 22,980 $ 77.36 Vested (225,527) 83.50 — — Forfeited (18,167) 83.10 — — Non-vested at December 31, 2020 420,234 69,669 Granted 247,917 $ 73.01 17,570 $ 88.25 Vested (166,965) 94.96 — — Forfeited (11,632) 75.83 — — Non-vested at December 31, 2021 489,554 87,239

Related Parties Related Parties

Related Parties Related Parties (Tables)	12 Months Ended
	Dec. 31, 2021
Related Party Transactions [Abstract]
Schedule of Related Party Transactions [Table Text Block]	Activity in loans to related parties is summarized as follows (in thousands): Year Ended December 31, 2021 2020 Beginning balance $ 92,940 $ 75,189 Advances 588,252 498,425 Payments (583,040) (484,958) Adjustments 1 (2,933) 4,284 Ending balance $ 95,219 $ 92,940

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2021
Earnings Per Share [Abstract]
Earnings Per Share [Table Text Block]	The following table presents the computation of basic and diluted earnings per share (dollars in thousands, except per share data): Year Ended 2021 2020 2019 Numerator: Net income attributable to BOK Financial Corp. shareholders $ 618,121 $ 435,030 $ 500,758 Less: Earnings allocated to participating securities 4,299 2,612 3,227 Numerator for basic earnings per share – income available to common shareholders 613,822 432,418 497,531 Effect of reallocating undistributed earnings of participating securities — — — Numerator for diluted earnings per share – income available to common shareholders $ 613,822 $ 432,418 $ 497,531 Denominator: Weighted average shares outstanding 69,071,511 70,259,553 71,250,081 Less: Participating securities included in weighted average shares outstanding 479,591 418,576 462,381 Denominator for basic earnings per common share 68,591,920 69,840,977 70,787,700 Dilutive effect of employee stock compensation plans 2,402 3,195 14,912 Denominator for diluted earnings per common share 68,594,322 69,844,172 70,802,612 Basic earnings per share $ 8.95 $ 6.19 $ 7.03 Diluted earnings per share $ 8.95 $ 6.19 $ 7.03

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2021
Stockholders' Equity Note [Abstract]
Summary of Regulatory Capital Levels [Table Text Block]	A summary of regulatory capital minimum requirements and levels follows (dollars in thousands): Minimum Capital Requirement Capital Conservation Buffer Minimum Capital Requirement Including Capital Conservation Buffer Well Capitalized Bank Requirement December 31, 2021 December 31, 2020 Common Equity Tier 1 Capital (to Risk Weighted Assets): Consolidated 4.50% 2.50% 7.00% N/A $ 4,230,626 12.24 % $ 3,881,912 11.95 % BOKF, NA 4.50% N/A 4.50% 6.50% 3,869,454 11.27 % 3,756,950 11.66 % Tier I Capital (to Risk Weighted Assets): Consolidated 6.00% 2.50% 8.50% N/A $ 4,235,265 12.25 % $ 3,881,912 11.95 % BOKF, NA 6.00% N/A 6.00% 8.00% 3,871,457 11.28 % 3,756,950 11.66 % Total Capital (to Risk Weighted Assets): Consolidated 8.00% 2.50% 10.50% N/A $ 4,594,787 13.29 % $ 4,489,110 13.82 % BOKF, NA 8.00% N/A 8.00% 10.00% 4,164,940 12.13 % 4,153,347 12.89 % Leverage (Tier I Capital to Average Assets): Consolidated 4.00% N/A 4.00% N/A $ 4,235,265 8.55 % $ 3,881,912 8.28 % BOKF, NA 4.00% N/A 4.00% 5.00% 3,871,457 7.84 % 3,756,950 8.04 %
Accumulated Other Comprehensive Income (Loss) [Table Text Block]	A rollforward of the components of accumulated other comprehensive income (loss) is included as follows (in thousands): Unrealized Gain (Loss) on Available for Sale Securities Employee Benefit Plans Total Balance, December 31, 2018 $ (70,999) $ (1,586) $ (72,585) Net change in unrealized gain (loss) 239,017 2,030 241,047 Reclassification adjustments included in earnings: Gain on available for sale securities, net (5,597) — (5,597) Other comprehensive income (loss), before income taxes 233,420 2,030 235,450 Federal and state income tax 57,425 517 57,942 Other comprehensive income (loss), net of income taxes 175,995 1,513 177,508 Balance, December 31, 2019 104,996 (73) 104,923 Net change in unrealized gain (loss) 312,576 1,220 313,796 Reclassification adjustments included in earnings: Gain on available for sale securities, net (9,910) — (9,910) Other comprehensive income (loss), before income taxes 302,666 1,220 303,886 Federal and state income tax 72,630 311 72,941 Other comprehensive income (loss), net of income taxes 230,036 909 230,945 Balance, December 31, 2020 335,032 836 335,868 Net change in unrealized gain (loss) (343,730) 2,361 (341,369) Reclassification adjustments included in earnings: Gain on available for sale securities, net (3,704) — (3,704) Other comprehensive income (loss), before income taxes (347,434) 2,361 (345,073) Federal and state income tax (82,177) 601 (81,576) Other comprehensive income (loss), net of income taxes (265,257) 1,760 (263,497) Balance, December 31, 2021 $ 69,775 $ 2,596 $ 72,371

Reportable Segments (Tables)

Reportable Segments (Tables)	12 Months Ended
	Dec. 31, 2021
Segment Reporting [Abstract]
Reportable Segments [Table Text Block]	Reportable segments reconciliation to the Consolidated Financial Statements for the year ended December 31, 2021 is as follows (in thousands): Commercial Consumer Wealth Funds Management and Other BOK Net interest and dividend revenue from external sources $ 606,902 $ 67,856 $ 214,458 $ 228,817 $ 1,118,033 Net interest revenue (expense) from internal sources (71,167) 35,671 (386) 35,882 — Net interest and dividend revenue 535,735 103,527 214,072 264,699 1,118,033 Net loans charged off and provision for credit losses 31,128 4,009 (223) (134,914) (100,000) Net interest and dividend revenue after provision for credit losses 504,607 99,518 214,295 399,613 1,218,033 Other operating revenue 262,402 173,341 298,962 21,070 755,775 Other operating expense 281,089 209,596 320,357 366,666 1,177,708 Net direct contribution 485,920 63,263 192,900 54,017 796,100 Gain (loss) on financial instruments, net 154 (21,871) — 21,717 — Change in fair value of mortgage servicing rights — 41,637 — (41,637) — Gain (loss) on repossessed assets, net 13,001 85 — (13,086) — Corporate expense allocations 49,941 46,010 40,301 (136,252) — Net income before taxes 449,134 37,104 152,599 157,263 796,100 Federal and state income taxes 120,618 9,461 39,049 10,647 179,775 Net income 328,516 27,643 113,550 146,616 616,325 Net income attributable to non-controlling interests — — — (1,796) (1,796) Net income attributable to BOK Financial Corp. shareholders $ 328,516 $ 27,643 $ 113,550 $ 148,412 $ 618,121 Average assets $ 28,536,881 $ 10,029,687 $ 19,425,475 $ (7,840,340) $ 50,151,703 Reportable segments reconciliation to the Consolidated Financial Statements for the year ended December 31, 2020 is as follows (in thousands): Commercial Consumer Wealth Funds Management and Other BOK Net interest and dividend revenue from external sources $ 714,932 $ 78,004 $ 130,818 $ 184,690 $ 1,108,444 Net interest revenue (expense) from internal sources (126,444) 69,000 (13,528) 70,972 — Net interest and dividend revenue 588,488 147,004 117,290 255,662 1,108,444 Net loans charged off and provision for credit losses 69,475 2,805 (209) 150,521 222,592 Net interest and dividend revenue after provision for credit losses 519,013 144,199 117,499 105,141 885,852 Other operating revenue 187,361 243,719 398,834 12,406 842,320 Other operating expense 258,903 230,402 325,627 349,376 1,164,308 Net direct contribution 447,471 157,516 190,706 (231,829) 563,864 Gain (loss) on financial instruments, net 193 95,344 4 (95,541) — Change in fair value of mortgage servicing rights — (79,524) — 79,524 — Gain (loss) on repossessed assets, net (2,677) 276 — 2,401 — Corporate expense allocations 24,862 42,155 35,331 (102,348) — Net income before taxes 420,125 131,457 155,379 (143,097) 563,864 Federal and state income taxes 114,120 33,483 39,765 (58,575) 128,793 Net income 306,005 97,974 115,614 (84,522) 435,071 Net loss attributable to non-controlling interests — — — 41 41 Net income attributable to BOK Financial Corp. shareholders $ 306,005 $ 97,974 $ 115,614 $ (84,563) $ 435,030 Average assets $ 26,994,075 $ 9,842,114 $ 15,695,646 $ (3,827,445) $ 48,704,390 Reportable segments reconciliation to the Consolidated Financial Statements for the year ended December 31, 2019 is as follows (in thousands): Commercial Consumer Wealth Funds Management and Other BOK Net interest and dividend revenue from external sources $ 919,148 $ 99,679 $ 61,277 $ 32,775 $ 1,112,879 Net interest revenue (expense) from internal sources (242,907) 95,775 38,815 108,317 — Net interest and dividend revenue 676,241 195,454 100,092 141,092 1,112,879 Net loans charged off and provision for credit losses 39,011 6,271 (308) (974) 44,000 Net interest and dividend revenue after provision for credit losses 637,230 189,183 100,400 142,066 1,068,879 Other operating revenue 170,412 187,500 341,389 (4,068) 695,233 Other operating expense 252,459 226,346 277,267 377,172 1,133,244 Net direct contribution 555,183 150,337 164,522 (239,174) 630,868 Gain (loss) on financial instruments, net 106 30,375 2 (30,483) — Change in fair value of mortgage servicing rights — (53,517) — 53,517 — Gain (loss) on repossessed assets, net 331 496 — (827) — Corporate expense allocations 43,055 46,926 36,239 (126,220) — Net income before taxes 512,565 80,765 128,285 (90,747) 630,868 Federal and state income taxes 137,759 20,572 32,954 (61,102) 130,183 Net income 374,806 60,193 95,331 (29,645) 500,685 Net income attributable to non-controlling interests — — — (73) (73) Net income attributable to BOK Financial Corp. shareholders $ 374,806 $ 60,193 $ 95,331 $ (29,572) $ 500,758 Average assets $ 22,807,589 $ 9,301,341 $ 10,204,426 $ (219,009) $ 42,094,347

Fees and Commission Revenue Fee

Fees and Commission Revenue Fees and Commissions Revenue (Tables)	12 Months Ended
	Dec. 31, 2021
Revenue from Contract with Customer [Abstract]
Disaggregation of Fees and Commissions Revenue [Table Text Block]	Fees and commissions revenue by reportable segment and primary service line is as follows for the year ended December 31, 2021. Commercial Consumer Wealth Management Funds Management and Other Consolidated Out of Scope 1 In Scope 2 Trading revenue $ — $ — $ 27,595 $ — $ 27,595 $ 27,595 $ — Customer hedging revenue 23,424 — 300 (3,292) 20,432 20,432 — Retail brokerage revenue — — 18,762 — 18,762 — 18,762 Insurance brokerage revenue — — 11,765 — 11,765 — 11,765 Investment banking revenue 19,129 — 16,742 (1,436) 34,435 16,272 18,163 Brokerage and trading revenue 42,553 — 75,164 (4,728) 112,989 64,299 48,690 TransFund EFT network revenue 76,603 3,591 (67) 6 80,133 — 80,133 Merchant services revenue 11,806 55 — — 11,861 — 11,861 Corporate card revenue 4,502 — 169 318 4,989 — 4,989 Transaction card revenue 92,911 3,646 102 324 96,983 — 96,983 Personal trust revenue — — 97,582 — 97,582 — 97,582 Corporate trust revenue — — 14,805 — 14,805 — 14,805 Institutional trust & retirement plan services revenue — — 50,765 — 50,765 — 50,765 Investment management services and other — — 15,300 (178) 15,122 — 15,122 Fiduciary and asset management revenue — — 178,452 (178) 178,274 — 178,274 Commercial account service charge revenue 50,213 1,821 2,326 — 54,360 — 54,360 Overdraft fee revenue 104 21,439 70 9 21,622 — 21,622 Check card revenue — 23,714 — — 23,714 — 23,714 Automated service charge and other deposit fee revenue 94 4,340 87 — 4,521 — 4,521 Deposit service charges and fees 50,411 51,314 2,483 9 104,217 — 104,217 Mortgage production revenue — 60,712 — — 60,712 60,712 — Mortgage servicing revenue — 47,055 — (1,871) 45,184 45,184 — Mortgage banking revenue — 107,767 — (1,871) 105,896 105,896 — Other revenue 41,206 10,637 42,564 (24,457) 69,950 54,349 15,601 Total fees and commissions revenue $ 227,081 $ 173,364 $ 298,765 $ (30,901) $ 668,309 $ 224,544 $ 443,765 1 Out of scope revenue generally relates to financial instruments or contractual rights and obligations within the scope of other applicable accounting guidance. 2 In scope revenue represents revenue subject to FASB ASC Topic 606, Revenue from Contracts with Customers. Fees and commissions revenue by reportable segment and primary service line is as follows for the year ended December 31, 2020. Commercial Consumer Wealth Management Funds Management and Other Consolidated Out of Scope 1 In Scope 2 Trading revenue $ — $ — $ 144,299 $ — $ 144,299 $ 144,299 $ — Customer hedging revenue 22,767 — 395 (413) 22,749 22,749 — Retail brokerage revenue — — 15,690 — 15,690 — 15,690 Insurance brokerage revenue — — 12,702 — 12,702 — 12,702 Investment banking revenue 9,183 — 17,391 (181) 26,393 8,530 17,863 Brokerage and trading revenue 31,950 — 190,477 (594) 221,833 175,578 46,255 TransFund EFT network revenue 75,363 3,058 (56) 5 78,370 — 78,370 Merchant services revenue 9,172 60 — — 9,232 — 9,232 Corporate card revenue 2,362 — 75 143 2,580 — 2,580 Transaction card revenue 86,897 3,118 19 148 90,182 — 90,182 Personal trust revenue — — 84,759 — 84,759 — 84,759 Corporate trust revenue — — 19,308 — 19,308 — 19,308 Institutional trust & retirement plan services revenue — — 46,253 — 46,253 — 46,253 Investment management services and other — — 17,290 (165) 17,125 — 17,125 Fiduciary and asset management revenue — — 167,610 (165) 167,445 — 167,445 Commercial account service charge revenue 44,489 1,654 2,282 (4) 48,421 — 48,421 Overdraft fee revenue 132 21,679 74 7 21,892 — 21,892 Check card revenue — 21,355 — — 21,355 — 21,355 Automated service charge and other deposit fee revenue 311 4,749 74 3 5,137 — 5,137 Deposit service charges and fees 44,932 49,437 2,430 6 96,805 — 96,805 Mortgage production revenue — 125,848 — — 125,848 125,848 — Mortgage servicing revenue — 58,249 — (1,737) 56,512 56,512 — Mortgage banking revenue — 184,097 — (1,737) 182,360 182,360 — Other revenue 23,340 8,902 38,693 (19,240) 51,695 39,092 12,603 Total fees and commissions revenue $ 187,119 $ 245,554 $ 399,229 $ (21,582) $ 810,320 $ 397,030 $ 413,290 1 Out of scope revenue generally relates to financial instruments or contractual rights and obligations within the scope of other applicable accounting guidance. 2 In scope revenue represents revenue subject to FASB ASC Topic 606, Revenue from Contracts with Customers. Fees and commissions revenue by reportable segment and primary service line is as follows for the year ended December 31, 2019. Commercial Consumer Wealth Management Funds Management and Other Consolidated Out of Scope 1 In Scope 2 Trading revenue $ — $ — $ 88,558 $ — $ 88,558 $ 88,558 $ — Customer hedging revenue 8,422 — 9,667 852 18,941 18,941 — Retail brokerage revenue — — 16,251 (115) 16,136 — 16,136 Insurance brokerage revenue — — 10,131 3,730 13,861 — 13,861 Investment banking revenue 10,136 — 12,194 — 22,330 8,678 13,652 Brokerage and trading revenue 18,558 — 136,801 4,467 159,826 116,177 43,649 TransFund EFT network revenue 73,479 3,924 (82) 3 77,324 — 77,324 Merchant services revenue 8,607 56 — 123 8,786 — 8,786 Corporate card revenue 1,072 — 32 2 1,106 — 1,106 Transaction card revenue 83,158 3,980 (50) 128 87,216 — 87,216 Personal trust revenue — — 81,763 — 81,763 — 81,763 Corporate trust revenue — — 24,635 — 24,635 — 24,635 Institutional trust & retirement plan services revenue — — 45,084 — 45,084 — 45,084 Investment management services and other — — 23,993 1,550 25,543 — 25,543 Fiduciary and asset management revenue — — 175,475 1,550 177,025 — 177,025 Commercial account service charge revenue 42,251 1,713 2,137 1,804 47,905 — 47,905 Overdraft fee revenue 313 35,134 138 (229) 35,356 — 35,356 Check card revenue — 21,865 — 165 22,030 — 22,030 Automated service charge and other deposit fee revenue 823 6,155 168 48 7,194 — 7,194 Deposit service charges and fees 43,387 64,867 2,443 1,788 112,485 — 112,485 Mortgage production revenue — 42,724 — (4) 42,720 42,720 — Mortgage servicing revenue — 66,692 — (1,871) 64,821 64,821 — Mortgage banking revenue — 109,416 — (1,875) 107,541 107,541 — Other revenue 23,564 9,733 26,664 (1,853) 58,108 39,428 18,680 Total fees and commissions revenue $ 168,667 $ 187,996 $ 341,333 $ 4,205 $ 702,201 $ 263,146 $ 439,055 1 Out of scope revenue generally relates to financial instruments or contractual rights and obligations within the scope of other applicable accounting guidance. 2 In scope revenue represents revenue subject to FASB ASC Topic 606, Revenue from Contracts with Customers.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2021
Fair Value Disclosures [Abstract]
Fair Value Assets And Liabilities Measured On A Recurring Basis [Table Text Block]	The fair value of financial assets and liabilities that are measured on a recurring basis is as follows as of December 31, 2021 (in thousands): Total Quoted Prices in Active Markets for Identical Instruments Significant Other Observable Inputs Significant Unobservable Inputs Assets: Trading securities: U.S. government securities $ 23,610 $ 4,999 $ 18,611 $ — Residential agency mortgage-backed securities 9,068,900 — 9,068,900 — Municipal securities 25,783 — 25,783 — Other trading securities 18,520 — 18,520 — Total trading securities 9,136,813 4,999 9,131,814 — Available for sale securities: U.S. Treasury 1,000 1,000 — — Municipal securities 508,365 — 508,365 — Residential agency mortgage-backed securities 8,006,616 — 8,006,616 — Residential non-agency mortgage-backed securities 24,339 — 24,339 — Commercial agency mortgage-backed securities 4,617,025 — 4,617,025 — Other debt securities 472 — — 472 Total available for sale securities 13,157,817 1,000 13,156,345 472 Fair value option securities — Residential agency mortgage-backed securities 43,770 — 43,770 — Residential mortgage loans held for sale 1 192,295 — 185,969 6,326 Mortgage servicing rights, net 2 163,198 — — 163,198 Derivative contracts, net of cash margin 3 1,097,297 8,331 1,088,966 — Liabilities: Derivative contracts, net of cash margin 3 275,625 — 275,625 — 1 Residential mortgage loans held for sale measured at fair value on a recurring basis using significant unobservable inputs (Level 3) consist of residential mortgage loans intended for sale to U.S. government agencies that fail to meet conforming standards and are valued at 95.07% of the unpaid principal balance. 2 A reconciliation of the beginning and ending fair value of mortgage servicing rights and disclosures of significant assumptions used to determine fair value are presented in Note 7, Mortgage Banking Activities. 3 See Note 3 for detail of fair value of derivative contracts by contract type. Derivative contracts in asset positions that were valued based on quoted prices in active markets for identical instruments (Level 1) are primarily exchange-traded interest rate derivative contracts. Derivative contracts in liability positions that were valued using quoted prices in active markets for identical instruments are exchange-traded energy derivative contracts, fully offset by cash margin. The fair value of financial assets and liabilities that are measured on a recurring basis is as follows as of December 31, 2020 (in thousands): Total Quoted Prices in Active Markets for Identical Instruments Significant Other Observable Inputs Significant Unobservable Inputs Assets: Trading securities: U.S. government securities $ 9,183 $ 4,999 $ 4,184 $ — Residential agency mortgage-backed securities 4,669,148 — 4,669,148 — Municipal securities 19,172 — 19,172 — Other trading securities 10,472 — 10,472 — Total trading securities 4,707,975 4,999 4,702,976 — Available for sale securities: U.S. Treasury 508 508 — — Municipal securities 167,979 — 167,979 — Residential agency mortgage-backed securities 9,340,471 — 9,340,471 — Residential non-agency mortgage-backed securities 32,770 — 32,770 — Commercial agency mortgage-backed securities 3,508,465 — 3,508,465 — Other debt securities 472 — — 472 Total available for sale securities 13,050,665 508 13,049,685 472 Fair value option securities — Residential agency mortgage-backed securities 114,982 — 114,982 — Residential mortgage loans held for sale 1 252,316 — 245,299 7,017 Mortgage servicing rights, net 2 101,172 — — 101,172 Derivative contracts, net of cash margin 3 810,688 10,780 799,908 — Liabilities: Derivative contracts, net of cash margin 3 405,779 — 405,779 — 1 Residential mortgage loans held for sale measured at fair value on a recurring basis using significant unobservable inputs (Level 3) consist of residential mortgage loans intended for sale to U.S. government agencies that fail to meet conforming standards and are valued at 94.57% of the unpaid principal balance. 2 A reconciliation of the beginning and ending fair value of mortgage servicing rights and disclosures of significant assumptions used to determine fair value are presented in Note 7, Mortgage Banking Activities. 3 See Note 3 for detail of fair value of derivative contracts by contract type. Derivative contracts based on quoted prices in active markets for identical instruments (Level 1) are exchange-traded interest rate derivative contracts, net of cash margin. Derivative contracts in liability positions that were valued using quoted prices in active markets for identical instruments (Level 1) are exchange-traded interest rate, energy and agricultural contracts, fully offset by cash margin.
Fair Value Assets Measured on Nonrecurring Basis [Table Text Block]	The following represents the carrying value of assets measured at fair value on a non-recurring basis and related losses recorded during the year. The carrying value represents only those assets with the balance sheet date for which the fair value was adjusted during the year: Carrying Value at December 31, 2021 Fair Value Adjustments for the Year Ended December 31, 2021 Recognized In: Quoted Prices Significant Significant Gross charge-offs against allowance for loan losses Other gains (losses), net Nonaccruing loans $ — $ 808 $ 1,990 $ 2,087 $ — Real estate and other repossessed assets — 1,706 — — (150) Carrying Value at December 31, 2020 Fair Value Adjustments for the Year Ended December 31, 2020 Recognized In: Quoted Prices Significant Significant Gross charge-offs against allowance for loan losses Other gains (losses), net Nonaccruing loans $ — $ 801 $ 20,423 $ 39,299 $ — Real estate and other repossessed assets — 18,188 2,842 — 4,602
Fair Value Inputs, Fair Value Measured On a Nonrecurring Basis, Quantitative Information [Table Text Block]	A summary of quantitative information about Non-recurring Fair Value Measurements based on Significant Unobservable Inputs (Level 3) as of December 31, 2021 follows (in thousands): Quantitative Information about Level 3 Non-recurring Fair Value Measurements Fair Value Valuation Technique(s) Significant Unobservable Input Range Nonaccruing loans $ 1,990 Discounted cash flows Management knowledge of industry and non-real estate collateral including but not limited to recoverable oil & gas reserves, forward looking commodity prices, and estimated operating costs 16% - 97% (37%) 1 1 Represents fair value as a percentage of the unpaid principal balance. A summary of quantitative information about Non-recurring Fair Value Measurements based on Significant Unobservable Inputs (Level 3) as of December 31, 2020 follows (in thousands): Quantitative Information about Level 3 Non-recurring Fair Value Measurements Fair Value Valuation Technique(s) Significant Unobservable Input Range Nonaccruing loans $ 20,423 Discounted cash flows Management knowledge of industry and non-real estate collateral including but not limited to recoverable oil & gas reserves, forward looking commodity prices, and estimated operating costs 1% - 91% (23%) 1 Real estate and other repossessed assets 2,842 Discounted cash flows Management knowledge of industry and non-real estate collateral including but not limited to recoverable oil & gas reserves, forward looking commodity prices, and estimated operating costs N/A 1 Represents fair value as a percentage of the unpaid principal balance.
Fair Value of Financial Instruments [Table Text Block]	The following table presents the carrying values and estimated fair values of all financial instruments, including those financial assets and liabilities that are not measured and reported at fair value on a recurring basis or non-recurring (dollars in thousands): December 31, 2021 Carrying Estimated Fair Value Quoted Prices in Active Markets for Identical Instruments (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Cash and due from banks $ 712,067 $ 712,067 $ 712,067 $ — $ — Interest-bearing cash and cash equivalents 2,125,343 2,125,343 2,125,343 — — Trading securities: U.S. government securities 23,610 23,610 4,999 18,611 — Residential agency mortgage-backed securities 9,068,900 9,068,900 — 9,068,900 — Municipal securities 25,783 25,783 — 25,783 — Other trading securities 18,520 18,520 — 18,520 — Total trading securities 9,136,813 9,136,813 4,999 9,131,814 — Investment securities: Municipal securities 203,772 223,609 — 57,698 165,911 Residential agency mortgage-backed securities 6,939 7,500 — 7,500 — Other debt securities 288 286 — 286 — Total investment securities 210,999 231,395 — 65,484 165,911 Allowance for credit losses (555) — — — — Investment securities, net of allowance 210,444 231,395 — 65,484 165,911 Available for sale securities: U.S. Treasury 1,000 1,000 1,000 — — Municipal securities 508,365 508,365 — 508,365 — Residential agency mortgage-backed securities 8,006,616 8,006,616 — 8,006,616 — Residential non-agency mortgage-backed securities 24,339 24,339 — 24,339 — Commercial agency mortgage-backed securities 4,617,025 4,617,025 — 4,617,025 — Other debt securities 472 472 — — 472 Total available for sale securities 13,157,817 13,157,817 1,000 13,156,345 472 Fair value option securities — Residential agency mortgage-backed securities 43,770 43,770 — 43,770 — Residential mortgage loans held for sale 192,295 192,295 — 185,969 6,326 Loans: Commercial 12,506,465 12,395,664 — — 12,395,664 Commercial real estate 3,831,325 3,786,767 — — 3,786,767 Paycheck protection program 276,341 269,912 — — 269,912 Loans to individuals 3,591,549 3,586,878 — — 3,586,878 Total loans 20,205,680 20,039,221 — — 20,039,221 Allowance for loan losses (256,421) — — — — Loans, net of allowance 19,949,259 20,039,221 — — 20,039,221 Mortgage servicing rights 163,198 163,198 — — 163,198 Derivative instruments with positive fair value, net of cash margin 1,097,297 1,097,297 8,331 1,088,966 — Deposits with no stated maturity 39,537,731 39,537,731 — — 39,537,731 Time deposits 1,704,328 1,703,886 — — 1,703,886 Other borrowed funds 2,363,202 2,360,746 — — 2,360,746 Subordinated debentures 131,226 141,761 — 141,761 — Derivative instruments with negative fair value, net of cash margin 275,625 275,625 — 275,625 — December 31, 2020 Carrying Estimated Fair Value Quoted Prices in Active Markets for Identical Instruments (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Cash and due from banks $ 798,757 $ 798,757 $ 798,757 $ — $ — Interest-bearing cash and cash equivalents 381,816 381,816 381,816 — — Trading securities: U.S. government securities 9,183 9,183 4,999 4,184 — Residential agency mortgage-backed securities 4,669,148 4,669,148 — 4,669,148 — Municipal securities 19,172 19,172 — 19,172 — Other trading securities 10,472 10,472 — 10,472 — Total trading securities 4,707,975 4,707,975 4,999 4,702,976 — Investment securities: Municipal securities 229,245 255,270 — 69,404 185,866 Residential agency mortgage-backed securities 8,913 9,790 — 9,790 — Other debt securities 7,373 7,371 — 7,371 — Total investment securities 245,531 272,431 — 86,565 185,866 Allowance for credit losses (688) — — — — Investment securities, net of allowance 244,843 272,431 — 86,565 185,866 Available for sale securities: U.S. Treasury securities 508 508 508 — — Municipal securities 167,979 167,979 — 167,979 — Residential agency mortgage-backed securities 9,340,471 9,340,471 — 9,340,471 — Residential non-agency mortgage-backed securities 32,770 32,770 — 32,770 — Commercial agency mortgage-backed securities 3,508,465 3,508,465 — 3,508,465 — Other debt securities 472 472 — — 472 Total available for sale securities 13,050,665 13,050,665 508 13,049,685 472 Fair value option securities — Residential agency mortgage-backed securities 114,982 114,982 — 114,982 — Residential mortgage loans held for sale 252,316 252,316 — 245,299 7,017 Loans: Commercial 13,077,535 13,003,383 — — 13,003,383 Commercial real estate 4,698,538 4,649,763 — — 4,649,763 Paycheck protection program 1,682,310 1,669,461 — — 1,669,461 Loans to individuals 3,549,137 3,563,199 — — 3,563,199 Total loans 23,007,520 22,885,806 — — 22,885,806 Allowance for loan losses (388,640) — — — — Loans, net of allowance 22,618,880 22,885,806 — — 22,885,806 Mortgage servicing rights 101,172 101,172 — — 101,172 Derivative instruments with positive fair value, net of cash margin 810,688 810,688 10,780 799,908 — Deposits with no stated maturity 34,176,752 34,176,752 — — 34,176,752 Time deposits 1,967,128 1,976,936 — — 1,976,936 Other borrowed funds 3,545,356 3,542,489 — — 3,542,489 Subordinated debentures 276,005 269,544 — 269,544 — Derivative instruments with negative fair value, net of cash margin 405,779 405,779 — 405,779 —

Parent Company Only Financial_2

Parent Company Only Financial Statements Parent Company Only Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2021
Condensed Financial Information Disclosure [Abstract]
Condensed Balance Sheet [Table Text Block]	Balance Sheets (In thousands) December 31, 2021 2020 Assets Cash and cash equivalents $ 230,647 $ 183,805 Loan to bank subsidiary 65,187 65,204 Investment in bank subsidiary 4,951,405 5,079,336 Investment in non-bank subsidiaries 228,447 195,768 Other assets 22,011 24,338 Total assets $ 5,497,697 $ 5,548,451 Liabilities and Shareholders’ Equity Liabilities: Other liabilities $ 2,739 $ 6,180 Subordinated debentures 131,226 276,005 Total liabilities 133,965 282,185 Shareholders’ equity: Common stock 5 5 Capital surplus 1,378,794 1,368,062 Retained earnings 4,447,691 3,973,675 Treasury stock (535,129) (411,344) Accumulated other comprehensive income 72,371 335,868 Total shareholders’ equity 5,363,732 5,266,266 Total liabilities and shareholders’ equity $ 5,497,697 $ 5,548,451
Condensed Income Statement [Table Text Block]	Statements of Earnings (In thousands) Year Ended December 31, 2021 2020 2019 Dividends, interest and fees received from bank subsidiary $ 483,868 $ 179,140 $ 344,007 Dividends, interest and fees received from non-bank subsidiaries 8,030 25,050 9,325 Other revenue 767 907 1,036 Total revenue 492,665 205,097 354,368 Interest expense 10,535 13,944 15,113 Other operating expense 2,914 2,697 2,352 Total expense 13,449 16,641 17,465 Net income before taxes, other losses, net, and equity in undistributed income of subsidiaries 479,216 188,456 336,903 Other gains (losses), net (3,415) 1,465 3,310 Net income before taxes and equity in undistributed income of subsidiaries 475,801 189,921 340,213 Federal and state income taxes (4,202) (4,502) (4,516) Net income before equity in undistributed income of subsidiaries 480,003 194,423 344,729 Equity in undistributed income of bank subsidiaries 126,380 276,217 166,797 Equity in undistributed income of non-bank subsidiaries 11,738 (35,610) (10,768) Net income attributable to BOK Financial Corp. shareholders $ 618,121 $ 435,030 $ 500,758
Condensed Cash Flow Statement [Table Text Block]	Statements of Cash Flows (In thousands) Year Ended December 31, 2021 2020 2019 Cash Flows From Operating Activities: Net income $ 618,121 $ 435,030 $ 500,758 Adjustments to reconcile net income to net cash provided by operating activities: Equity in undistributed income of bank subsidiaries (126,380) (276,217) (166,797) Equity in undistributed income of non-bank subsidiaries (11,738) 35,610 10,768 Other losses (gains), net 3,415 (1,465) (3,310) Change in other assets 1,160 15,225 (1,765) Change in other liabilities 389 850 855 Net cash provided by operating activities 484,967 209,033 340,509 Cash Flows From Investing Activities: Investment in subsidiaries (25,665) (14,807) (19,837) Dissolution of subsidiaries 4,457 — — Net cash used in investing activities (21,208) (14,807) (19,837) Cash Flows From Financing Activities: Repayment of subordinated debentures (150,000) — — Issuance of common and treasury stock, net (4,874) (4,933) (7) Dividends paid (144,105) (144,437) (143,496) Repurchase of common stock (117,938) (75,830) (129,483) Net cash used in financing activities (416,917) (225,200) (272,986) Net increase (decrease) in cash and cash equivalents 46,842 (30,974) 47,686 Cash and cash equivalents at beginning of period 183,805 214,779 167,093 Cash and cash equivalents at end of period $ 230,647 $ 183,805 $ 214,779 Cash paid for interest $ 10,559 $ 14,064 $ 15,099

Significant Accounting Polici_3

Significant Accounting Policies Goodwill and Intangible Assets (Details)	12 Months Ended
	Dec. 31, 2021
Minimum [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	3 years
Maximum [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	20 years

Significant Accounting Polici_4

Significant Accounting Policies Cash Equivalents (Details)	12 Months Ended
	Dec. 31, 2021
Cash and Cash Equivalents [Abstract]
Maturity of Federal Funds Sold Considered Cash Equivalents	1 day
Maturity of Resell Agreement Considered Cash Equivalents, Minimum	1 day
Maturity of Resell Agreements Considered Cash Equivalents, Maximum	30 days

Significant Accounting Polici_5

Significant Accounting Policies Loans (Details)	12 Months Ended
	Dec. 31, 2021
Loans [Abstract]
Loans, Number of Days Past Due for a Non-Risk Graded Loan to be Placed on Nonaccruing Status	90 days
Loans, Number of Days After Notification of Chapter 7 Bankruptcy Non-Risk Graded Loan is Placed on Nonaccruing Status	60 days
Loans, Minimum Number of Days After Which Past Due Non-Risk Graded Loans Are Charged Off	60 days
Loans, Maximum Number of Days After Which Past Due Non-Risk Graded Loans Are Charged Off	180 days
Loans, Number of Days After Notification of Chapter 7 Bankruptcy Non-Risk Graded Loan is Charged Off	60 days

Significant Accounting Polici_6

Significant Accounting Policies Premises and Equipment (Details)	12 Months Ended
	Dec. 31, 2021
Buildings and improvements | Minimum [Member]
Premises and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Buildings and improvements | Maximum [Member]
Premises and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	40 years
Software and Software Development Costs [Member] | Minimum [Member]
Premises and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Software and Software Development Costs [Member] | Maximum [Member]
Premises and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Furniture and equipment | Minimum [Member]
Premises and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Furniture and equipment | Maximum [Member]
Premises and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	10 years

Significant Accounting Polici_7

Significant Accounting Policies Share-Based Compensation (Details)	12 Months Ended
	Dec. 31, 2021
Stock Options [Member]
Share-based Compensation Arrangements by Share-based Payment Award [Line Items]
Vesting period (in years)	7 years
Restricted Stock [Member]
Share-based Compensation Arrangements by Share-based Payment Award [Line Items]
Vesting period (in years)	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Required Holding Period	2 years

Trading Securities (Details)

Trading Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Schedule of Trading Securities [Line Items]
Trading securities	$ 9,136,813	$ 4,707,975
Trading Securities, Net Unrealized Gain (Loss)	(9,290)	(3,560)
U.S. government securities [Member]
Schedule of Trading Securities [Line Items]
Trading securities	23,610	9,183
Trading Securities, Net Unrealized Gain (Loss)	40	0
Residential agency mortgage-backed securities [Member]
Schedule of Trading Securities [Line Items]
Trading securities	9,068,900	4,669,148
Trading Securities, Net Unrealized Gain (Loss)	(9,338)	(3,624)
Municipal securities [Member]
Schedule of Trading Securities [Line Items]
Trading securities	25,783	19,172
Trading Securities, Net Unrealized Gain (Loss)	34	42
Other debt securities [Member]
Schedule of Trading Securities [Line Items]
Trading securities	18,520	10,472
Trading Securities, Net Unrealized Gain (Loss)	$ (26)	$ 22

Investment (Held-to-Maturity) S

Investment (Held-to-Maturity) Securities (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2021USD ($)	Dec. 31, 2020USD ($)
Schedule of Investment (Held-to-Maturity) Securities [Line Items]
Debt Securities, Held-to-maturity, gross		$ 210,999	$ 245,531
Investment Securities, fair value		231,395	272,431
Investment Securities, Gross Unrealized Gain		20,412	27,046
Investment Securities, Gross Unrealized Loss		(16)	(146)
Debt Securities, Held-to-maturity, Allowance for Credit Loss		555	688
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss		$ 210,444	$ 244,843
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions		3	8
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		$ 273	$ 2,701
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		587	2,068
Investment Securities, Continuous Unrealized Loss Position, Fair Value		860	4,769
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Losses		2	41
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Losses		14	105
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss		16	146
Fixed maturity securities [Member]
Investment Securities, Debt Maturities, Net, Amortized Cost [Abstract]
Investment Securities, Debt Maturities, Less than One Year, Net Carrying Value		21,800
Investment Securities, Debt Maturities, One to Five Years, Net Carrying Value		103,923
Investment Securities, Debt Maturities, Six to Ten Years, Net Carrying Value		72,262
Investment Securities, Debt Maturities, Over Ten Years, Net Carrying Value		6,075
Investment Securities, Debt Maturities, Single Maturity Date, Carrying Value		204,060
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]
Investment Securities, Debt Maturities, Less than One Year, Fair Value		21,960
Investment Securities, Debt Maturities, One to Five Years, Fair Value		117,750
Investment Securities, Debt Maturities, Six to Ten Years, Fair Value		78,053
Investment Securities, Debt Maturities, Over Ten Years, Fair Value		6,132
Investment Securities, Debt Maturities, Single Maturity Date, Fair value		$ 223,895
Investment Securities, Debt Maturities, Weighted Average Maturity	[1]	4.45
Municipal securities [Member]
Schedule of Investment (Held-to-Maturity) Securities [Line Items]
Debt Securities, Held-to-maturity, gross		$ 203,772	229,245
Investment Securities, fair value		223,609	255,270
Investment Securities, Gross Unrealized Gain		19,851	26,169
Investment Securities, Gross Unrealized Loss		$ (14)	$ (144)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions		1	6
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		$ 0	$ 2,451
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		587	2,043
Investment Securities, Continuous Unrealized Loss Position, Fair Value		587	4,494
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Losses		0	40
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Losses		14	104
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss		14	144
Residential agency mortgage-backed securities [Member]
Schedule of Investment (Held-to-Maturity) Securities [Line Items]
Debt Securities, Held-to-maturity, gross		6,939	8,913
Investment Securities, fair value		7,500	9,790
Investment Securities, Gross Unrealized Gain		561	877
Investment Securities, Gross Unrealized Loss		0	0
Investment Securities, Debt Maturities, Net, Amortized Cost [Abstract]
Investment Securities, Debt Maturities, without Single Maturity Date, Net Carrying value	[2]	6,939
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]
Investment Securities, Debt Maturities, without Single Maturity Date, Fair value		$ 7,500
Investment Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities		4 years 1 month 6 days
Other debt securities [Member]
Schedule of Investment (Held-to-Maturity) Securities [Line Items]
Debt Securities, Held-to-maturity, gross		$ 288	7,373
Investment Securities, fair value		286	7,371
Investment Securities, Gross Unrealized Gain		0	0
Investment Securities, Gross Unrealized Loss		$ (2)	$ (2)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions		2	2
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		$ 273	$ 250
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		0	25
Investment Securities, Continuous Unrealized Loss Position, Fair Value		273	275
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Losses		2	1
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Losses		0	1
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss		$ 2	$ 2
[1]	Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without penalty.
[2]	The average expected lives of residential mortgage-backed securities were 4.1 years based upon current prepayment assumptions.

Available for Sale Securities (

Available for Sale Securities (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2021USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Available for Sale Securities [Line Items]
Available for sale securities, Amortized Cost		$ 13,064,436	$ 12,609,850
Available for sale securities		13,157,817	13,050,665
Available for sale securities, Gross Unrealized Gain		207,361	449,654
Available for sale securities, Gross Unrealized Loss		(113,980)	(8,839)
Available for Sale Securities, Realized Gain (Loss) [Abstract]
Proceeds from sales of available for sale securities		622,881	384,507	$ 1,211,718
Available for sale securities, Gross realized gains		5,702	9,976	14,996
Available for sale securities, Gross realized losses		(1,998)	(66)	(9,399)
Available for sale securities, Related federal and state income tax expense		889	2,524	$ 1,425
Available for sale securities, Pledged as Collateral, Fair Value		10,200,000	11,600,000
Fixed maturity securities [Member]
Available for Sale Securities, Debt Maturities, Amortized Cost, Rolling Maturity [Abstract]
Available for sale securities, Debt Maturities, Less than One Year, Amortized Cost		74,454
Available for sale securities, Debt Maturities, One to Five Years, Amortized Cost		1,881,944
Available for sale securities, Debt Maturities, Six to Ten Years, Amortized Cost		2,695,022
Available for sale securities, Debt Maturities, Over Ten Years, Amortized Cost		493,804
Available for sale securities, Maturity, Allocated and Single Maturity Date, Amortized Cost		5,145,224
Available for Sale Securities, Maturity, Fair Value, Rolling Maturity [Abstract]
Available for sale securities, Debt Maturities, Less Than One Year, Fair Value		74,874
Available for sale securities, Debt Maturities, One to Five Years, Fair Value		1,898,237
Available for sale securities, Debt Maturities, Six to Ten Years, Fair Value		2,657,759
Available for sale securities, Debt Maturities, Over Ten Years, Fair Value		495,992
Available for sale securities, Debt Maturities, Single Maturity Date, Fair value		$ 5,126,862
Available for sale securities, Debt Maturities, Weighted Average Maturity	[1]	6.76
U.S. Treasury [Member]
Available for Sale Securities [Line Items]
Available for sale securities, Amortized Cost		$ 1,001	500
Available for sale securities		1,000	508
Available for sale securities, Gross Unrealized Gain		0	8
Available for sale securities, Gross Unrealized Loss		(1)	0
Municipal securities [Member]
Available for Sale Securities [Line Items]
Available for sale securities, Amortized Cost		515,551	165,318
Available for sale securities		508,365	167,979
Available for sale securities, Gross Unrealized Gain		1,302	2,666
Available for sale securities, Gross Unrealized Loss		(8,488)	(5)
Commercial agency mortgage-backed securities [Member]
Available for Sale Securities [Line Items]
Available for sale securities, Amortized Cost		4,628,172	3,406,956
Available for sale securities		4,617,025	3,508,465
Available for sale securities, Gross Unrealized Gain		36,868	103,590
Available for sale securities, Gross Unrealized Loss		(48,015)	(2,081)
Other debt securities [Member]
Available for Sale Securities [Line Items]
Available for sale securities, Amortized Cost		500	500
Available for sale securities		472	472
Available for sale securities, Gross Unrealized Gain		0	0
Available for sale securities, Gross Unrealized Loss		(28)	(28)
Residential Mortgage Backed Securities [Member]
Available for Sale Securities, Debt Maturities, Amortized Cost, Rolling Maturity [Abstract]
Available for sale securities, Maturity, without Single Maturity Date, Amortized Cost	[2]	7,919,212
Available for Sale Securities, Maturity, Fair Value, Rolling Maturity [Abstract]
Available for sale securities, Debt Maturities, without Single Maturity Date, Fair value		$ 8,030,955
Available for sale securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities		3 years 8 months 12 days
Residential agency mortgage-backed securities [Member]
Available for Sale Securities [Line Items]
Available for sale securities, Amortized Cost		$ 7,908,587	9,019,013
Available for sale securities		8,006,616	9,340,471
Available for sale securities, Gross Unrealized Gain		155,477	328,183
Available for sale securities, Gross Unrealized Loss		(57,448)	(6,725)
Residential non-agency mortgage-backed securities [Member]
Available for Sale Securities [Line Items]
Available for sale securities, Amortized Cost		10,625	17,563
Available for sale securities		24,339	32,770
Available for sale securities, Gross Unrealized Gain		13,714	15,207
Available for sale securities, Gross Unrealized Loss		$ 0	$ 0
[1]	Expected maturities may differ from contractual maturities, because borrowers may have the right to call or prepay obligations with or without penalty.
[2]	The average expected lives of residential mortgage-backed securities were 3.7 years based upon current prepayment assumptions.

Securities Available for sale,

Securities Available for sale, Unrealized Loss Position, Fair Value (Details) $ in Thousands	Dec. 31, 2021USD ($)	Dec. 31, 2020USD ($)
Available for sale, Unrealized Loss Position [Line Items]
Available for sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	462	77
Available for sale, Securities in Unrealized Loss Position, Less than 12 Months [Abstract]
Available for sale securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	$ 4,911,358	$ 1,143,562
Available for sale securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	1,476,208	438,846
Available for sale securities, Unrealized Loss Position, Fair Value	6,387,566	1,582,408
Available for sale securities, Securities in Unrealized Loss Position, Accumulated Loss [Abstract]
Available for sale securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	80,372	8,197
Available for sale securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	33,608	642
Available for sale securities, Unrealized Loss Position, Accumulated Loss	113,980	$ 8,839
Debt Securities, Available-for-sale, Allowance for Credit Loss	$ 0
U.S. Treasury [Member]
Available for sale, Unrealized Loss Position [Line Items]
Available for sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	1
Available for sale, Securities in Unrealized Loss Position, Less than 12 Months [Abstract]
Available for sale securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	$ 1,000
Available for sale securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	0
Available for sale securities, Unrealized Loss Position, Fair Value	1,000
Available for sale securities, Securities in Unrealized Loss Position, Accumulated Loss [Abstract]
Available for sale securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1
Available for sale securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Available for sale securities, Unrealized Loss Position, Accumulated Loss	$ 1
Municipal securities [Member]
Available for sale, Unrealized Loss Position [Line Items]
Available for sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	175	1
Available for sale, Securities in Unrealized Loss Position, Less than 12 Months [Abstract]
Available for sale securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	$ 423,575	$ 6,166
Available for sale securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	22,476	0
Available for sale securities, Unrealized Loss Position, Fair Value	446,051	6,166
Available for sale securities, Securities in Unrealized Loss Position, Accumulated Loss [Abstract]
Available for sale securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	7,762	5
Available for sale securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	726	0
Available for sale securities, Unrealized Loss Position, Accumulated Loss	$ 8,488	$ 5
Residential agency mortgage-backed securities [Member]
Available for sale, Unrealized Loss Position [Line Items]
Available for sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	120	38
Available for sale, Securities in Unrealized Loss Position, Less than 12 Months [Abstract]
Available for sale securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	$ 2,382,094	$ 786,890
Available for sale securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	750,044	160,747
Available for sale securities, Unrealized Loss Position, Fair Value	3,132,138	947,637
Available for sale securities, Securities in Unrealized Loss Position, Accumulated Loss [Abstract]
Available for sale securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	37,121	6,605
Available for sale securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	20,327	120
Available for sale securities, Unrealized Loss Position, Accumulated Loss	$ 57,448	$ 6,725
Commercial agency mortgage-backed securities [Member]
Available for sale, Unrealized Loss Position [Line Items]
Available for sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	165	37
Available for sale, Securities in Unrealized Loss Position, Less than 12 Months [Abstract]
Available for sale securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	$ 2,104,689	$ 350,506
Available for sale securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	703,216	277,627
Available for sale securities, Unrealized Loss Position, Fair Value	2,807,905	628,133
Available for sale securities, Securities in Unrealized Loss Position, Accumulated Loss [Abstract]
Available for sale securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	35,488	1,587
Available for sale securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	12,527	494
Available for sale securities, Unrealized Loss Position, Accumulated Loss	$ 48,015	$ 2,081
Other debt securities [Member]
Available for sale, Unrealized Loss Position [Line Items]
Available for sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	1	1
Available for sale, Securities in Unrealized Loss Position, Less than 12 Months [Abstract]
Available for sale securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	$ 0	$ 0
Available for sale securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	472	472
Available for sale securities, Unrealized Loss Position, Fair Value	472	472
Available for sale securities, Securities in Unrealized Loss Position, Accumulated Loss [Abstract]
Available for sale securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	0
Available for sale securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	28	28
Available for sale securities, Unrealized Loss Position, Accumulated Loss	$ 28	$ 28

Securities Fair Value Option Se

Securities Fair Value Option Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Fair Value Option Securities [Line Items]
Fair value option securities	$ 43,770	$ 114,982
Residential agency mortgage-backed securities [Member]
Fair Value Option Securities [Line Items]
Fair value option securities	43,770	114,982
Fair Value Option Securities Unrealized Gain or Loss	$ 1,591	$ 4,463

Derivatives, Fair Value of Deri

Derivatives, Fair Value of Derivatives Contracts (Details) - USD ($) $ in Thousands	Dec. 31, 2021		Dec. 31, 2020
Derivative Assets, Fair Value, Net [Abstract]
Derivative Assets, Fair Value, Net of Cash Collateral	$ 1,097,297		$ 810,688
Derivative Liabilities, Fair Value, Net [Abstract]
Derivative Liabilities, Fair Value, Net of Cash Collateral	275,625		405,779
Not Designated as Hedging Instrument [Member]
Notional Amount of Derivatives [Abstract]
Derivative Assets, Notional	45,694,922	[1]	93,418,715	[2]
Derivative Liabilities, Notional	50,930,000	[1]	96,326,522	[2]
Derivative Assets, Fair Value, Net [Abstract]
Derivative Assets, Gross Fair Value	1,588,528		1,294,849
Derivative Assets, Netting Adjustments	(490,268)		(456,498)
Derivative Assets, Net Fair Value Before Cash Collateral	1,098,260		838,351
Derivative Assets, Cash Collateral	(963)		(27,663)
Derivative Assets, Fair Value, Net of Cash Collateral	1,097,297		810,688
Derivative Liabilities, Fair Value, Net [Abstract]
Derivative Liabilities, Gross Fair Value	1,627,386		1,231,665
Derivative Liabilities, Netting Adjustments	(490,268)		(456,498)
Derivative Liabilities, Net Fair Value Before Cash Collateral	1,137,118		775,167
Derivative Liabilities, Cash Collateral	(861,493)		(369,388)
Derivative Liabilities, Fair Value, Net of Cash Collateral	275,625		405,779
Not Designated as Hedging Instrument [Member] | Total customer risk management programs [Member]
Notional Amount of Derivatives [Abstract]
Derivative Assets, Notional	9,232,665	[1]	7,425,999	[2]
Derivative Liabilities, Notional	9,345,519	[1]	7,251,350	[2]
Derivative Assets, Fair Value, Net [Abstract]
Derivative Assets, Gross Fair Value	1,438,147		836,870
Derivative Assets, Netting Adjustments	(385,725)		(211,612)
Derivative Assets, Net Fair Value Before Cash Collateral	1,052,422		625,258
Derivative Assets, Cash Collateral	(242)		(705)
Derivative Assets, Fair Value, Net of Cash Collateral	1,052,180		624,553
Derivative Liabilities, Fair Value, Net [Abstract]
Derivative Liabilities, Gross Fair Value	1,472,882		811,335
Derivative Liabilities, Netting Adjustments	(385,725)		(211,612)
Derivative Liabilities, Net Fair Value Before Cash Collateral	1,087,157		599,723
Derivative Liabilities, Cash Collateral	(837,419)		(223,281)
Derivative Liabilities, Fair Value, Net of Cash Collateral	249,738		376,442
Not Designated as Hedging Instrument [Member] | Interest rate swaps [Member]
Notional Amount of Derivatives [Abstract]
Derivative Assets, Notional	2,614,162	[1]	3,212,469	[2]
Derivative Liabilities, Notional	2,614,162	[1]	3,212,469	[2]
Derivative Assets, Fair Value, Net [Abstract]
Derivative Assets, Gross Fair Value	53,881		113,524
Derivative Assets, Netting Adjustments	(10,101)		(144)
Derivative Assets, Net Fair Value Before Cash Collateral	43,780		113,380
Derivative Assets, Cash Collateral	0		0
Derivative Assets, Fair Value, Net of Cash Collateral	43,780		113,380
Derivative Liabilities, Fair Value, Net [Abstract]
Derivative Liabilities, Gross Fair Value	54,062		113,900
Derivative Liabilities, Netting Adjustments	(10,101)		(144)
Derivative Liabilities, Net Fair Value Before Cash Collateral	43,961		113,756
Derivative Liabilities, Cash Collateral	(33,870)		(104,202)
Derivative Liabilities, Fair Value, Net of Cash Collateral	10,091		9,554
Not Designated as Hedging Instrument [Member] | Energy contracts [Member]
Notional Amount of Derivatives [Abstract]
Derivative Assets, Notional	6,360,095	[1]	3,791,565	[2]
Derivative Liabilities, Notional	6,480,840	[1]	3,617,678	[2]
Derivative Assets, Fair Value, Net [Abstract]
Derivative Assets, Gross Fair Value	1,168,363		386,008
Derivative Assets, Netting Adjustments	(375,624)		(211,468)
Derivative Assets, Net Fair Value Before Cash Collateral	792,739		174,540
Derivative Assets, Cash Collateral	0		0
Derivative Assets, Fair Value, Net of Cash Collateral	792,739		174,540
Derivative Liabilities, Fair Value, Net [Abstract]
Derivative Liabilities, Gross Fair Value	1,210,946		361,334
Derivative Liabilities, Netting Adjustments	(375,624)		(211,468)
Derivative Liabilities, Net Fair Value Before Cash Collateral	835,322		149,866
Derivative Liabilities, Cash Collateral	(803,102)		(114,070)
Derivative Liabilities, Fair Value, Net of Cash Collateral	32,220		35,796
Not Designated as Hedging Instrument [Member] | Agricultural contracts [Member]
Notional Amount of Derivatives [Abstract]
Derivative Assets, Notional	0	[1]	14,765	[2]
Derivative Liabilities, Notional	0	[1]	14,781	[2]
Derivative Assets, Fair Value, Net [Abstract]
Derivative Assets, Gross Fair Value	0		3,859
Derivative Assets, Netting Adjustments	0		0
Derivative Assets, Net Fair Value Before Cash Collateral	0		3,859
Derivative Assets, Cash Collateral	0		0
Derivative Assets, Fair Value, Net of Cash Collateral	0		3,859
Derivative Liabilities, Fair Value, Net [Abstract]
Derivative Liabilities, Gross Fair Value	0		3,844
Derivative Liabilities, Netting Adjustments	0		0
Derivative Liabilities, Net Fair Value Before Cash Collateral	0		3,844
Derivative Liabilities, Cash Collateral	0		(3,844)
Derivative Liabilities, Fair Value, Net of Cash Collateral	0		0
Not Designated as Hedging Instrument [Member] | Foreign exchange contracts [Member]
Notional Amount of Derivatives [Abstract]
Derivative Assets, Notional	216,272	[1]	337,001	[2]
Derivative Liabilities, Notional	208,381	[1]	336,223	[2]
Derivative Assets, Fair Value, Net [Abstract]
Derivative Assets, Gross Fair Value	215,148		332,257
Derivative Assets, Netting Adjustments	0		0
Derivative Assets, Net Fair Value Before Cash Collateral	215,148		332,257
Derivative Assets, Cash Collateral	0		(420)
Derivative Assets, Fair Value, Net of Cash Collateral	215,148		331,837
Derivative Liabilities, Fair Value, Net [Abstract]
Derivative Liabilities, Gross Fair Value	207,119		331,035
Derivative Liabilities, Netting Adjustments	0		0
Derivative Liabilities, Net Fair Value Before Cash Collateral	207,119		331,035
Derivative Liabilities, Cash Collateral	(447)		(1,165)
Derivative Liabilities, Fair Value, Net of Cash Collateral	206,672		329,870
Not Designated as Hedging Instrument [Member] | Equity option contracts [Member]
Notional Amount of Derivatives [Abstract]
Derivative Assets, Notional	42,136	[1]	70,199	[2]
Derivative Liabilities, Notional	42,136	[1]	70,199	[2]
Derivative Assets, Fair Value, Net [Abstract]
Derivative Assets, Gross Fair Value	755		1,222
Derivative Assets, Netting Adjustments	0		0
Derivative Assets, Net Fair Value Before Cash Collateral	755		1,222
Derivative Assets, Cash Collateral	(242)		(285)
Derivative Assets, Fair Value, Net of Cash Collateral	513		937
Derivative Liabilities, Fair Value, Net [Abstract]
Derivative Liabilities, Gross Fair Value	755		1,222
Derivative Liabilities, Netting Adjustments	0		0
Derivative Liabilities, Net Fair Value Before Cash Collateral	755		1,222
Derivative Liabilities, Cash Collateral	0		0
Derivative Liabilities, Fair Value, Net of Cash Collateral	755		1,222
Not Designated as Hedging Instrument [Member] | Trading [Member]
Notional Amount of Derivatives [Abstract]
Derivative Assets, Notional	35,592,751	[1]	84,997,593	[2]
Derivative Liabilities, Notional	41,285,649	[1]	88,929,916	[2]
Derivative Assets, Fair Value, Net [Abstract]
Derivative Assets, Gross Fair Value	139,694		440,627
Derivative Assets, Netting Adjustments	(104,326)		(240,655)
Derivative Assets, Net Fair Value Before Cash Collateral	35,368		199,972
Derivative Assets, Cash Collateral	(721)		(26,958)
Derivative Assets, Fair Value, Net of Cash Collateral	34,647		173,014
Derivative Liabilities, Fair Value, Net [Abstract]
Derivative Liabilities, Gross Fair Value	152,947		414,801
Derivative Liabilities, Netting Adjustments	(104,326)		(240,655)
Derivative Liabilities, Net Fair Value Before Cash Collateral	48,621		174,146
Derivative Liabilities, Cash Collateral	(24,074)		(145,692)
Derivative Liabilities, Fair Value, Net of Cash Collateral	24,547		28,454
Not Designated as Hedging Instrument [Member] | Internal risk management programs [Member]
Notional Amount of Derivatives [Abstract]
Derivative Assets, Notional	869,506	[1]	995,123	[2]
Derivative Liabilities, Notional	298,832	[1]	145,256	[2]
Derivative Assets, Fair Value, Net [Abstract]
Derivative Assets, Gross Fair Value	10,687		17,352
Derivative Assets, Netting Adjustments	(217)		(4,231)
Derivative Assets, Net Fair Value Before Cash Collateral	10,470		13,121
Derivative Assets, Cash Collateral	0		0
Derivative Assets, Fair Value, Net of Cash Collateral	10,470		13,121
Derivative Liabilities, Fair Value, Net [Abstract]
Derivative Liabilities, Gross Fair Value	1,557		5,529
Derivative Liabilities, Netting Adjustments	(217)		(4,231)
Derivative Liabilities, Net Fair Value Before Cash Collateral	1,340		1,298
Derivative Liabilities, Cash Collateral	0		(415)
Derivative Liabilities, Fair Value, Net of Cash Collateral	$ 1,340		$ 883
[1]	Notional amounts for commodity contracts are converted into dollar-equivalent amounts based on dollar prices at the inception of the contract.
[2]	Notional amounts for commodity contracts are converted into dollar-equivalent amounts based on dollar prices at the inception of the contract.

Derivatives, Derivatives Instru

Derivatives, Derivatives Instruments Gain (Loss) in Income Statement (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Trading Activity, Gains and Losses, Net [Line Items]
Brokerage and Trading Revenue		$ 8,979	$ 31,004	$ 32,940
Gain (Loss) on Derivatives, Net		(19,378)	42,320	14,951
To-be-announced residential mortgage-backed securities [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Brokerage and Trading Revenue	[1]	0	0	9,579
Gain (Loss) on Derivatives, Net	[1]	0	0	0
Interest rate swaps [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Brokerage and Trading Revenue		5,503	4,507	3,647
Gain (Loss) on Derivatives, Net		0	0	0
Energy contracts [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Brokerage and Trading Revenue		14,190	17,287	5,064
Gain (Loss) on Derivatives, Net		0	0	0
Agricultural contracts [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Brokerage and Trading Revenue		27	34	28
Gain (Loss) on Derivatives, Net		0	0	0
Foreign exchange contracts [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Brokerage and Trading Revenue		712	921	623
Gain (Loss) on Derivatives, Net		0	0	0
Equity option contracts [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Brokerage and Trading Revenue		0	0	0
Gain (Loss) on Derivatives, Net		0	0	0
Total customer risk management programs [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Brokerage and Trading Revenue		20,432	22,749	18,941
Gain (Loss) on Derivatives, Net		0	0	0
Trading [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Brokerage and Trading Revenue	[2]	(11,453)	8,255	13,999
Gain (Loss) on Derivatives, Net	[2]	0	0	0
Internal risk management programs [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Brokerage and Trading Revenue		0	0	0
Gain (Loss) on Derivatives, Net		$ (19,378)	$ 42,320	$ 14,951
[1]	To-be-announced U.S. agency residential mortgage-backed securities customer hedging program transitioned to trading program during 2019.
[2]	Includes changes in fair value of to-be-announced U.S. agency residential mortgage-backed securities and other derivative instruments offered to mortgage banking customers to manage their market risk or held to mitigate market risk of trading securities portfolio, which is offset by changes in fair value of trading securities also included in Brokerage and trading revenue in the Consolidated Statement of Earnings.

Loans and Allowances for Cred_3

Loans and Allowances for Credit Losses, Loans by Portfolio Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Loans receivables disclosure [Abstract]
Loans, fixed rate of interest	$ 6,603,265	$ 8,078,873
Loans, variable rate of interest	13,468,356	14,693,954
Loans, non-accrual	134,059	234,693
Total	20,205,680	23,007,520
Foregone interest on nonaccrual loans	14,102	22,870
Credit Commitments [Abstract]
Outstanding commitments to extend credit	12,500,000
Outstanding standby letters of credit	700,000
Geographic Concentration Risk [Member] | Texas [Member]
Loans receivables disclosure [Abstract]
Total	$ 6,800,000	$ 7,200,000
Loans receivable, other information [Abstract]
Percentage of loan portfolio secured by property in Texas (in hundredths)	34.00%	31.00%
Geographic Concentration Risk [Member] | Oklahoma [Member]
Loans receivables disclosure [Abstract]
Total	$ 3,200,000	$ 3,800,000
Loans receivable, other information [Abstract]
Percentage of loan portfolio secured by property in Oklahoma (in hundredths)	16.00%	17.00%
Geographic Concentration Risk [Member] | Colorado [Member]
Loans receivables disclosure [Abstract]
Total	$ 2,500,000	$ 2,800,000
Loans receivable, other information [Abstract]
Percentage of loan portfolio secured by property in Colorado (in hundredths)	12.00%	12.00%
Commercial [Member]
Loans receivables disclosure [Abstract]
Loans, fixed rate of interest	$ 3,360,117	$ 3,174,203
Loans, variable rate of interest	9,072,244	9,736,173
Loans, non-accrual	74,104	167,159
Total	12,506,465	13,077,535
Commercial [Member] | Geographic Concentration Risk [Member] | Texas [Member]
Loans receivables disclosure [Abstract]
Total	$ 4,400,000	$ 4,300,000
Loans receivable, other information [Abstract]
Percentage of loan portfolio secured by property in Texas (in hundredths)	35.00%	33.00%
Commercial [Member] | Geographic Concentration Risk [Member] | Oklahoma [Member]
Loans receivables disclosure [Abstract]
Total	$ 1,700,000	$ 1,800,000
Loans receivable, other information [Abstract]
Percentage of loan portfolio secured by property in Oklahoma (in hundredths)	13.00%	14.00%
Commercial [Member] | Geographic Concentration Risk [Member] | Colorado [Member]
Loans receivables disclosure [Abstract]
Total	$ 1,600,000	$ 1,700,000
Loans receivable, other information [Abstract]
Percentage of loan portfolio secured by property in Colorado (in hundredths)	13.00%	13.00%
Commercial [Member] | Services [Member]
Loans receivable, other information [Abstract]
Amount of loans with individual balances less than $10 million	$ 1,700,000	$ 1,500,000
Commercial [Member] | Services [Member] | Credit Concentration Risk [Member]
Loans receivables disclosure [Abstract]
Total	$ 3,400,000	$ 3,500,000
Loans receivable, other information [Abstract]
Percentage of loan class to total loans	17.00%	15.00%
Commercial [Member] | Energy [Member] | Credit Concentration Risk [Member]
Loans receivables disclosure [Abstract]
Total	$ 3,000,000	$ 3,500,000
Loans receivable, other information [Abstract]
Percentage of loan class to total loans	15.00%	15.00%
Commercial [Member] | Energy Producers [Member] | Credit Concentration Risk [Member]
Loans receivables disclosure [Abstract]
Total	$ 2,200,000	$ 2,600,000
Loans receivable, other information [Abstract]
Percentage of committed energy production loans secured by oil	67.00%	58.00%
Percentage of committed energy production loans secured by natural gas	33.00%	42.00%
Commercial [Member] | Healthcare [Member] | Credit Concentration Risk [Member]
Loans receivables disclosure [Abstract]
Total	$ 3,400,000	$ 3,300,000
Loans receivable, other information [Abstract]
Percentage of loan class to total loans	17.00%	14.00%
Commercial real estate [Member]
Loans receivables disclosure [Abstract]
Loans, fixed rate of interest	$ 929,015	$ 1,047,486
Loans, variable rate of interest	2,888,048	3,623,806
Loans, non-accrual	14,262	27,246
Total	$ 3,831,325	$ 4,698,538
Commercial real estate [Member] | Geographic Concentration Risk [Member] | Texas [Member]
Loans receivable, other information [Abstract]
Percentage of loan portfolio secured by property in Texas (in hundredths)	30.00%	27.00%
Commercial real estate [Member] | Geographic Concentration Risk [Member] | Oklahoma [Member]
Loans receivable, other information [Abstract]
Percentage of loan portfolio secured by property in Oklahoma (in hundredths)	12.00%	10.00%
Paycheck Protection Program
Loans receivables disclosure [Abstract]
Loans, fixed rate of interest	$ 276,341	$ 1,682,310
Loans, variable rate of interest	0	0
Loans, non-accrual	0	0
Total	276,341	1,682,310
Loans to individuals [Member]
Loans receivables disclosure [Abstract]
Loans, fixed rate of interest	2,037,792	2,174,874
Loans, variable rate of interest	1,508,064	1,333,975
Loans, non-accrual	45,693	40,288
Total	$ 3,591,549	$ 3,549,137
Loans receivable, other information [Abstract]
Percentage of personal loans secured by collateral in our geographical footprint	91.00%

Loans and Allowances for Cred_4

Loans and Allowances for Credit Losses, Activity in Allowance for Credit Losses (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Allowance for loan losses [Roll Forward]
Beginning balance - CECL	$ 388,640,000	$ 236,568,000
Provision for loan losses - CECL	(95,202,000)	222,460,000
Loans charged off	(51,351,000)	(79,399,000)	$ (50,977,000)
Recoveries of loans previously charged off	14,334,000	9,011,000	10,074,000
Ending Balance - CECL	256,421,000	388,640,000	236,568,000
Beginning balance, Incurred Loss Model	388,640,000	210,759,000	207,457,000
Provision for loan losses			44,205,000
Ending balance, Incurred Loss Model	256,421,000	388,640,000	210,759,000
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability, Beginning Balance - CECL	36,921,000	25,137,000
Provision for off-balance sheet credit risk	(3,944,000)	11,784,000
Off-Balance Sheet, Credit Loss, Liability, Ending Balance - CECL	32,977,000	36,921,000	25,137,000
Accrual for off-balance sheet credit losses [Roll Forward]
Beginning balance - Incurred loss model		1,585,000	1,790,000
Provision for off-balance sheet credit losses			(205,000)
Ending balance - Incurred loss model			1,585,000
Total provision for credit losses	(100,000,000)	222,592,000	44,000,000
Provision Details [Abstract]
Change in provision due to changes in reasonable and supportable forecasts, primarily due to COVID-19 pandemic [Line Items]	(90,100,000)
Other changes to provision	(9,000,000)
Recorded investment [Abstract]
Collectively measured for impairment, recorded investment	20,071,621,000	22,772,827,000
Individually measured for impairment, recorded investment	134,059,000	234,693,000
Total	20,205,680,000	23,007,520,000
Related allowance [Abstract]
Collectively measured for impairment, related allowance	250,079,000	366,199,000
Individually measured for impairment, related allowance	6,342,000	22,441,000
Loans and Leases Receivable, Allowance, Total	256,421,000	388,640,000	210,759,000
Commercial [Member]
Allowance for loan losses [Roll Forward]
Beginning balance - CECL	254,934,000	151,868,000
Provision for loan losses - CECL	(59,326,000)	171,800,000
Loans charged off	(43,956,000)	(73,370,000)	(43,185,000)
Recoveries of loans previously charged off	10,404,000	4,636,000	2,021,000
Ending Balance - CECL	162,056,000	254,934,000	151,868,000
Beginning balance, Incurred Loss Model		118,187,000	102,226,000
Provision for loan losses			57,125,000
Ending balance, Incurred Loss Model			118,187,000
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability, Beginning Balance - CECL	14,422,000	11,578,000
Provision for off-balance sheet credit risk	(610,000)	2,844,000
Off-Balance Sheet, Credit Loss, Liability, Ending Balance - CECL	13,812,000	14,422,000	11,578,000
Accrual for off-balance sheet credit losses [Roll Forward]
Beginning balance - Incurred loss model		1,434,000	1,655,000
Provision for off-balance sheet credit losses			(221,000)
Ending balance - Incurred loss model			1,434,000
Total provision for credit losses			56,904,000
Recorded investment [Abstract]
Collectively measured for impairment, recorded investment	12,432,361,000	12,910,376,000
Individually measured for impairment, recorded investment	74,104,000	167,159,000
Total	12,506,465,000	13,077,535,000
Related allowance [Abstract]
Collectively measured for impairment, related allowance	158,063,000	235,882,000
Individually measured for impairment, related allowance	3,993,000	19,052,000
Loans and Leases Receivable, Allowance, Total			118,187,000
Commercial real estate [Member]
Allowance for loan losses [Roll Forward]
Beginning balance - CECL	86,558,000	47,185,000
Provision for loan losses - CECL	(26,522,000)	40,407,000
Loans charged off	(2,485,000)	(1,300,000)	(1,161,000)
Recoveries of loans previously charged off	1,002,000	266,000	4,986,000
Ending Balance - CECL	58,553,000	86,558,000	47,185,000
Beginning balance, Incurred Loss Model		51,805,000	60,026,000
Provision for loan losses			(12,046,000)
Ending balance, Incurred Loss Model			51,805,000
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability, Beginning Balance - CECL	20,571,000	11,767,000
Provision for off-balance sheet credit risk	(3,129,000)	8,804,000
Off-Balance Sheet, Credit Loss, Liability, Ending Balance - CECL	17,442,000	20,571,000	11,767,000
Accrual for off-balance sheet credit losses [Roll Forward]
Beginning balance - Incurred loss model		107,000	52,000
Provision for off-balance sheet credit losses			55,000
Ending balance - Incurred loss model			107,000
Total provision for credit losses			(11,991,000)
Recorded investment [Abstract]
Collectively measured for impairment, recorded investment	3,817,063,000	4,671,292,000
Individually measured for impairment, recorded investment	14,262,000	27,246,000
Total	3,831,325,000	4,698,538,000
Related allowance [Abstract]
Collectively measured for impairment, related allowance	56,204,000	83,169,000
Individually measured for impairment, related allowance	2,349,000	3,389,000
Loans and Leases Receivable, Allowance, Total			51,805,000
Paycheck Protection Program
Allowance for loan losses [Roll Forward]
Beginning balance - CECL	0	0
Provision for loan losses - CECL	0	10,253,000
Loans charged off	0	(4,729,000)
Recoveries of loans previously charged off	0	4,109,000
Ending Balance - CECL	0	0	0
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability, Beginning Balance - CECL	0	0
Provision for off-balance sheet credit risk	0	136,000
Off-Balance Sheet, Credit Loss, Liability, Ending Balance - CECL	0	0	0
Recorded investment [Abstract]
Collectively measured for impairment, recorded investment	276,341,000	1,682,310,000
Individually measured for impairment, recorded investment	0	0
Total	276,341,000	1,682,310,000
Related allowance [Abstract]
Collectively measured for impairment, related allowance	0	0
Individually measured for impairment, related allowance	0	0
Loans to individuals [Member]
Allowance for loan losses [Roll Forward]
Beginning balance - CECL	47,148,000	37,515,000
Provision for loan losses - CECL	(9,354,000)	0
Loans charged off	(4,910,000)	0
Recoveries of loans previously charged off	2,928,000	0
Ending Balance - CECL	35,812,000	47,148,000	37,515,000
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability, Beginning Balance - CECL	1,928,000	1,792,000
Provision for off-balance sheet credit risk	(205,000)	0
Off-Balance Sheet, Credit Loss, Liability, Ending Balance - CECL	1,723,000	1,928,000	1,792,000
Recorded investment [Abstract]
Collectively measured for impairment, recorded investment	3,545,856,000	3,508,849,000
Individually measured for impairment, recorded investment	45,693,000	40,288,000
Total	3,591,549,000	3,549,137,000
Related allowance [Abstract]
Collectively measured for impairment, related allowance	35,812,000	47,148,000
Individually measured for impairment, related allowance	0	0
Loans to individuals [Member] | Residential Mortgage [Member]
Allowance for loan losses [Roll Forward]
Loans charged off			(288,000)
Recoveries of loans previously charged off			562,000
Beginning balance, Incurred Loss Model		14,400,000	17,964,000
Provision for loan losses			(3,838,000)
Ending balance, Incurred Loss Model			14,400,000
Accrual for off-balance sheet credit losses [Roll Forward]
Beginning balance - Incurred loss model		44,000	52,000
Provision for off-balance sheet credit losses			(8,000)
Ending balance - Incurred loss model			44,000
Total provision for credit losses			(3,846,000)
Related allowance [Abstract]
Loans and Leases Receivable, Allowance, Total			14,400,000
Loans to individuals [Member] | Personal [Member]
Allowance for loan losses [Roll Forward]
Loans charged off			(6,343,000)
Recoveries of loans previously charged off			2,505,000
Beginning balance, Incurred Loss Model		9,172,000	9,473,000
Provision for loan losses			3,537,000
Ending balance, Incurred Loss Model			9,172,000
Accrual for off-balance sheet credit losses [Roll Forward]
Beginning balance - Incurred loss model		0	31,000
Provision for off-balance sheet credit losses			(31,000)
Ending balance - Incurred loss model			0
Total provision for credit losses			3,506,000
Related allowance [Abstract]
Loans and Leases Receivable, Allowance, Total			9,172,000
Nonspecific Allowance [Member]
Allowance for loan losses [Roll Forward]
Beginning balance - CECL	0	0
Provision for loan losses - CECL	0	0
Loans charged off	0	0	0
Recoveries of loans previously charged off	0	0	0
Ending Balance - CECL	0	0	0
Beginning balance, Incurred Loss Model		17,195,000	17,768,000
Provision for loan losses			(573,000)
Ending balance, Incurred Loss Model			17,195,000
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability, Beginning Balance - CECL	0	0
Provision for off-balance sheet credit risk	0	0
Off-Balance Sheet, Credit Loss, Liability, Ending Balance - CECL	$ 0	0	0
Accrual for off-balance sheet credit losses [Roll Forward]
Beginning balance - Incurred loss model		0	0
Provision for off-balance sheet credit losses			0
Ending balance - Incurred loss model			0
Total provision for credit losses			(573,000)
Related allowance [Abstract]
Loans and Leases Receivable, Allowance, Total			17,195,000
Transition Adjustment [Member]
Allowance for loan losses [Roll Forward]
Beginning balance - CECL		25,809,000
Ending Balance - CECL			25,809,000
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability, Beginning Balance - CECL		23,552,000
Off-Balance Sheet, Credit Loss, Liability, Ending Balance - CECL			23,552,000
Transition Adjustment [Member] | Commercial [Member]
Allowance for loan losses [Roll Forward]
Beginning balance - CECL		33,681,000
Ending Balance - CECL			33,681,000
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability, Beginning Balance - CECL		10,144,000
Off-Balance Sheet, Credit Loss, Liability, Ending Balance - CECL			10,144,000
Transition Adjustment [Member] | Commercial real estate [Member]
Allowance for loan losses [Roll Forward]
Beginning balance - CECL		(4,620,000)
Ending Balance - CECL			(4,620,000)
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability, Beginning Balance - CECL		11,660,000
Off-Balance Sheet, Credit Loss, Liability, Ending Balance - CECL			11,660,000
Transition Adjustment [Member] | Paycheck Protection Program
Allowance for loan losses [Roll Forward]
Beginning balance - CECL		13,943,000
Ending Balance - CECL			13,943,000
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability, Beginning Balance - CECL		1,748,000
Off-Balance Sheet, Credit Loss, Liability, Ending Balance - CECL			1,748,000
Transition Adjustment [Member] | Loans to individuals [Member]
Allowance for loan losses [Roll Forward]
Beginning balance - CECL		0
Ending Balance - CECL			0
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability, Beginning Balance - CECL		0
Off-Balance Sheet, Credit Loss, Liability, Ending Balance - CECL			0
Transition Adjustment [Member] | Nonspecific Allowance [Member]
Allowance for loan losses [Roll Forward]
Beginning balance - CECL		(17,195,000)
Ending Balance - CECL			(17,195,000)
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability, Beginning Balance - CECL		0
Off-Balance Sheet, Credit Loss, Liability, Ending Balance - CECL			0
Previously Reported [Member]
Allowance for loan losses [Roll Forward]
Beginning balance - CECL		210,759,000
Ending Balance - CECL			210,759,000
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability, Beginning Balance - CECL		1,585,000
Off-Balance Sheet, Credit Loss, Liability, Ending Balance - CECL			1,585,000
Previously Reported [Member] | Commercial [Member]
Allowance for loan losses [Roll Forward]
Beginning balance - CECL		118,187,000
Ending Balance - CECL			118,187,000
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability, Beginning Balance - CECL		1,434,000
Off-Balance Sheet, Credit Loss, Liability, Ending Balance - CECL			1,434,000
Previously Reported [Member] | Commercial real estate [Member]
Allowance for loan losses [Roll Forward]
Beginning balance - CECL		51,805,000
Ending Balance - CECL			51,805,000
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability, Beginning Balance - CECL		107,000
Off-Balance Sheet, Credit Loss, Liability, Ending Balance - CECL			107,000
Previously Reported [Member] | Paycheck Protection Program
Allowance for loan losses [Roll Forward]
Beginning balance - CECL		23,572,000
Ending Balance - CECL			23,572,000
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability, Beginning Balance - CECL		44,000
Off-Balance Sheet, Credit Loss, Liability, Ending Balance - CECL			44,000
Previously Reported [Member] | Loans to individuals [Member]
Allowance for loan losses [Roll Forward]
Beginning balance - CECL		0
Ending Balance - CECL			0
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability, Beginning Balance - CECL		0
Off-Balance Sheet, Credit Loss, Liability, Ending Balance - CECL			0
Previously Reported [Member] | Nonspecific Allowance [Member]
Allowance for loan losses [Roll Forward]
Beginning balance - CECL		17,195,000
Ending Balance - CECL			17,195,000
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability, Beginning Balance - CECL		$ 0
Off-Balance Sheet, Credit Loss, Liability, Ending Balance - CECL			$ 0

Loans and Allowances for Cred_5

Loans and Allowances for Credit Losses, Credit Quality Indicators (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	$ 3,678,190	$ 4,855,463
Financing Receivable, Originated, Year 2	2,680,781	3,161,473
Financing Receivable, Originated, Year 3	2,305,870	2,651,833
Financing Receivable, Originated, Year 4	1,579,560	1,788,880
Financing Receivable, Originated, Year 5	1,250,651	1,356,476
Financing Receivable, Originated, More Than Five Years	3,124,953	3,054,469
Financing Receivable, Revolving	5,559,595	6,108,767
Financing Receivable, Revolving, Converted to Term Loan	26,080	30,159
Total	20,205,680	23,007,520
Commercial [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	2,115,523	1,657,760
Financing Receivable, Originated, Year 2	1,284,235	1,557,142
Financing Receivable, Originated, Year 3	1,142,464	1,461,282
Financing Receivable, Originated, Year 4	995,008	1,013,619
Financing Receivable, Originated, Year 5	761,286	747,318
Financing Receivable, Originated, More Than Five Years	1,725,540	1,603,533
Financing Receivable, Revolving	4,479,513	5,033,683
Financing Receivable, Revolving, Converted to Term Loan	2,896	3,198
Total	12,506,465	13,077,535
Commercial [Member] | Energy [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	263,341	157,690
Financing Receivable, Originated, Year 2	73,425	55,833
Financing Receivable, Originated, Year 3	17,099	90,799
Financing Receivable, Originated, Year 4	14,362	7,178
Financing Receivable, Originated, Year 5	4,741	13,815
Financing Receivable, Originated, More Than Five Years	8,195	29,020
Financing Receivable, Revolving	2,625,721	3,114,859
Financing Receivable, Revolving, Converted to Term Loan	0	0
Total	3,006,884	3,469,194
Commercial [Member] | Healthcare [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	570,635	536,745
Financing Receivable, Originated, Year 2	589,193	642,739
Financing Receivable, Originated, Year 3	559,276	639,676
Financing Receivable, Originated, Year 4	506,083	423,763
Financing Receivable, Originated, Year 5	330,231	234,531
Financing Receivable, Originated, More Than Five Years	698,828	680,890
Financing Receivable, Revolving	160,668	147,646
Financing Receivable, Revolving, Converted to Term Loan	26	0
Total	3,414,940	3,305,990
Commercial [Member] | Services [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	696,626	540,265
Financing Receivable, Originated, Year 2	405,992	452,269
Financing Receivable, Originated, Year 3	295,371	399,264
Financing Receivable, Originated, Year 4	287,001	326,282
Financing Receivable, Originated, Year 5	244,397	381,902
Financing Receivable, Originated, More Than Five Years	799,961	700,028
Financing Receivable, Revolving	637,278	707,891
Financing Receivable, Revolving, Converted to Term Loan	567	682
Total	3,367,193	3,508,583
Commercial [Member] | General business [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	584,921	423,060
Financing Receivable, Originated, Year 2	215,625	406,301
Financing Receivable, Originated, Year 3	270,718	331,543
Financing Receivable, Originated, Year 4	187,562	256,396
Financing Receivable, Originated, Year 5	181,917	117,070
Financing Receivable, Originated, More Than Five Years	218,556	193,595
Financing Receivable, Revolving	1,055,846	1,063,287
Financing Receivable, Revolving, Converted to Term Loan	2,303	2,516
Total	2,717,448	2,793,768
Commercial real estate [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	717,400	725,577
Financing Receivable, Originated, Year 2	711,231	1,219,638
Financing Receivable, Originated, Year 3	879,359	954,485
Financing Receivable, Originated, Year 4	423,127	506,146
Financing Receivable, Originated, Year 5	294,436	325,092
Financing Receivable, Originated, More Than Five Years	687,894	744,404
Financing Receivable, Revolving	117,847	223,158
Financing Receivable, Revolving, Converted to Term Loan	31	38
Total	3,831,325	4,698,538
Paycheck Protection Program
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	237,357	1,682,310
Financing Receivable, Originated, Year 2	38,984	0
Financing Receivable, Originated, Year 3	0	0
Financing Receivable, Originated, Year 4	0	0
Financing Receivable, Originated, Year 5	0	0
Financing Receivable, Originated, More Than Five Years	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Revolving, Converted to Term Loan	0	0
Total	276,341	1,682,310
Loans to individuals [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	607,910	789,816
Financing Receivable, Originated, Year 2	646,331	384,693
Financing Receivable, Originated, Year 3	284,047	236,066
Financing Receivable, Originated, Year 4	161,425	269,115
Financing Receivable, Originated, Year 5	194,929	284,066
Financing Receivable, Originated, More Than Five Years	711,519	706,532
Financing Receivable, Revolving	962,235	851,926
Financing Receivable, Revolving, Converted to Term Loan	23,153	26,923
Total	3,591,549	3,549,137
Loans to individuals [Member] | Residential mortgage [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	387,706	565,006
Financing Receivable, Originated, Year 2	454,346	149,947
Financing Receivable, Originated, Year 3	84,540	124,678
Financing Receivable, Originated, Year 4	62,358	125,714
Financing Receivable, Originated, Year 5	68,925	160,870
Financing Receivable, Originated, More Than Five Years	318,373	371,059
Financing Receivable, Revolving	323,497	340,316
Financing Receivable, Revolving, Converted to Term Loan	22,425	25,413
Total	1,722,170	1,863,003
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	699	4,859
Financing Receivable, Originated, Year 2	11,380	33,880
Financing Receivable, Originated, Year 3	21,909	35,009
Financing Receivable, Originated, Year 4	28,791	43,099
Financing Receivable, Originated, Year 5	33,377	58,573
Financing Receivable, Originated, More Than Five Years	258,017	233,267
Financing Receivable, Revolving	0	0
Financing Receivable, Revolving, Converted to Term Loan	0	0
Total	354,173	408,687
Loans to individuals [Member] | Personal [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	219,505	219,951
Financing Receivable, Originated, Year 2	180,605	200,866
Financing Receivable, Originated, Year 3	177,598	76,379
Financing Receivable, Originated, Year 4	70,276	100,302
Financing Receivable, Originated, Year 5	92,627	64,623
Financing Receivable, Originated, More Than Five Years	135,129	102,206
Financing Receivable, Revolving	638,738	511,610
Financing Receivable, Revolving, Converted to Term Loan	728	1,510
Total	1,515,206	1,277,447
Performing [Member] | Commercial [Member] | Energy [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	252,133	112,614
Financing Receivable, Originated, Year 2	29,556	51,863
Financing Receivable, Originated, Year 3	15,914	89,346
Financing Receivable, Originated, Year 4	13,548	7,178
Financing Receivable, Originated, Year 5	4,741	1,148
Financing Receivable, Originated, More Than Five Years	6,765	7,956
Financing Receivable, Revolving	2,540,525	2,548,663
Financing Receivable, Revolving, Converted to Term Loan	0	0
Total	2,863,182	2,818,768
Performing [Member] | Commercial [Member] | Energy [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	558	0
Financing Receivable, Originated, Year 2	771	0
Financing Receivable, Originated, Year 3	0	0
Financing Receivable, Originated, Year 4	0	0
Financing Receivable, Originated, Year 5	0	0
Financing Receivable, Originated, More Than Five Years	0	0
Financing Receivable, Revolving	750	202,590
Financing Receivable, Revolving, Converted to Term Loan	0	0
Total	2,079	202,590
Performing [Member] | Commercial [Member] | Energy [Member] | Accruing Substandard [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	10,650	24,000
Financing Receivable, Originated, Year 2	22,611	1,363
Financing Receivable, Originated, Year 3	1,185	1,453
Financing Receivable, Originated, Year 4	814	0
Financing Receivable, Originated, Year 5	0	12,667
Financing Receivable, Originated, More Than Five Years	716	0
Financing Receivable, Revolving	74,556	283,294
Financing Receivable, Revolving, Converted to Term Loan	0	0
Total	110,532	322,777
Performing [Member] | Commercial [Member] | Healthcare [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	563,800	536,745
Financing Receivable, Originated, Year 2	589,193	615,221
Financing Receivable, Originated, Year 3	516,558	638,302
Financing Receivable, Originated, Year 4	498,998	422,834
Financing Receivable, Originated, Year 5	319,096	234,399
Financing Receivable, Originated, More Than Five Years	688,136	658,286
Financing Receivable, Revolving	160,154	147,132
Financing Receivable, Revolving, Converted to Term Loan	26	0
Total	3,335,961	3,252,919
Performing [Member] | Commercial [Member] | Healthcare [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	6,835	0
Financing Receivable, Originated, Year 2	0	27,500
Financing Receivable, Originated, Year 3	15,583	0
Financing Receivable, Originated, Year 4	0	0
Financing Receivable, Originated, Year 5	11,135	0
Financing Receivable, Originated, More Than Five Years	0	8,282
Financing Receivable, Revolving	5	5
Financing Receivable, Revolving, Converted to Term Loan	0	0
Total	33,558	35,787
Performing [Member] | Commercial [Member] | Healthcare [Member] | Accruing Substandard [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0	0
Financing Receivable, Originated, Year 2	0	0
Financing Receivable, Originated, Year 3	27,135	1,191
Financing Receivable, Originated, Year 4	543	929
Financing Receivable, Originated, Year 5	0	132
Financing Receivable, Originated, More Than Five Years	1,981	11,387
Financing Receivable, Revolving	0	0
Financing Receivable, Revolving, Converted to Term Loan	0	0
Total	29,659	13,639
Performing [Member] | Commercial [Member] | Services [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	696,149	534,853
Financing Receivable, Originated, Year 2	405,057	436,384
Financing Receivable, Originated, Year 3	289,375	372,867
Financing Receivable, Originated, Year 4	275,010	307,374
Financing Receivable, Originated, Year 5	225,404	373,785
Financing Receivable, Originated, More Than Five Years	795,029	683,936
Financing Receivable, Revolving	607,958	665,491
Financing Receivable, Revolving, Converted to Term Loan	375	682
Total	3,294,357	3,375,372
Performing [Member] | Commercial [Member] | Services [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	434	150
Financing Receivable, Originated, Year 2	405	9,057
Financing Receivable, Originated, Year 3	1,830	389
Financing Receivable, Originated, Year 4	1,047	291
Financing Receivable, Originated, Year 5	3,290	2,038
Financing Receivable, Originated, More Than Five Years	47	2,000
Financing Receivable, Revolving	17,210	3,063
Financing Receivable, Revolving, Converted to Term Loan	192	0
Total	24,455	16,988
Performing [Member] | Commercial [Member] | Services [Member] | Accruing Substandard [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	43	429
Financing Receivable, Originated, Year 2	530	6,380
Financing Receivable, Originated, Year 3	4,166	26,008
Financing Receivable, Originated, Year 4	10,714	6,027
Financing Receivable, Originated, Year 5	1,785	5,030
Financing Receivable, Originated, More Than Five Years	2,366	7,954
Financing Receivable, Revolving	11,607	38,797
Financing Receivable, Revolving, Converted to Term Loan	0	0
Total	31,211	90,625
Performing [Member] | Commercial [Member] | General business [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	584,438	419,756
Financing Receivable, Originated, Year 2	211,892	394,985
Financing Receivable, Originated, Year 3	264,462	310,273
Financing Receivable, Originated, Year 4	177,384	236,222
Financing Receivable, Originated, Year 5	168,977	103,987
Financing Receivable, Originated, More Than Five Years	215,014	186,600
Financing Receivable, Revolving	1,047,420	1,055,878
Financing Receivable, Revolving, Converted to Term Loan	2,284	2,316
Total	2,671,871	2,710,017
Performing [Member] | Commercial [Member] | General business [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	218	197
Financing Receivable, Originated, Year 2	223	4,519
Financing Receivable, Originated, Year 3	60	9,713
Financing Receivable, Originated, Year 4	1,435	7,803
Financing Receivable, Originated, Year 5	3,842	2,511
Financing Receivable, Originated, More Than Five Years	0	3,159
Financing Receivable, Revolving	5,875	2,483
Financing Receivable, Revolving, Converted to Term Loan	0	19
Total	11,653	30,404
Performing [Member] | Commercial [Member] | General business [Member] | Accruing Substandard [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	265	1,432
Financing Receivable, Originated, Year 2	1,066	3,069
Financing Receivable, Originated, Year 3	1,634	6,694
Financing Receivable, Originated, Year 4	7,697	10,935
Financing Receivable, Originated, Year 5	8,336	10,042
Financing Receivable, Originated, More Than Five Years	3,024	3,729
Financing Receivable, Revolving	1,821	4,449
Financing Receivable, Revolving, Converted to Term Loan	0	140
Total	23,843	40,490
Performing [Member] | Commercial real estate [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	717,400	725,577
Financing Receivable, Originated, Year 2	711,231	1,211,338
Financing Receivable, Originated, Year 3	871,283	954,226
Financing Receivable, Originated, Year 4	403,115	489,193
Financing Receivable, Originated, Year 5	279,058	314,899
Financing Receivable, Originated, More Than Five Years	664,684	722,475
Financing Receivable, Revolving	117,847	223,131
Financing Receivable, Revolving, Converted to Term Loan	31	38
Total	3,764,649	4,640,877
Performing [Member] | Commercial real estate [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0	0
Financing Receivable, Originated, Year 2	0	0
Financing Receivable, Originated, Year 3	0	259
Financing Receivable, Originated, Year 4	6,660	12,311
Financing Receivable, Originated, Year 5	10,898	2,725
Financing Receivable, Originated, More Than Five Years	9,244	5,831
Financing Receivable, Revolving	0	0
Financing Receivable, Revolving, Converted to Term Loan	0	0
Total	26,802	21,126
Performing [Member] | Commercial real estate [Member] | Accruing Substandard [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0	0
Financing Receivable, Originated, Year 2	0	0
Financing Receivable, Originated, Year 3	0	0
Financing Receivable, Originated, Year 4	13,352	4,410
Financing Receivable, Originated, Year 5	4,480	0
Financing Receivable, Originated, More Than Five Years	7,780	4,852
Financing Receivable, Revolving	0	27
Financing Receivable, Revolving, Converted to Term Loan	0	0
Total	25,612	9,289
Performing [Member] | Paycheck Protection Program | Pass [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	237,357	1,682,310
Financing Receivable, Originated, Year 2	38,984	0
Financing Receivable, Originated, Year 3	0	0
Financing Receivable, Originated, Year 4	0	0
Financing Receivable, Originated, Year 5	0	0
Financing Receivable, Originated, More Than Five Years	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Revolving, Converted to Term Loan	0	0
Total	276,341	1,682,310
Performing [Member] | Loans to individuals [Member] | Residential mortgage [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	386,092	564,325
Financing Receivable, Originated, Year 2	452,537	149,832
Financing Receivable, Originated, Year 3	84,001	120,875
Financing Receivable, Originated, Year 4	60,390	124,930
Financing Receivable, Originated, Year 5	68,150	158,801
Financing Receivable, Originated, More Than Five Years	295,632	348,292
Financing Receivable, Revolving	320,638	335,259
Financing Receivable, Revolving, Converted to Term Loan	21,463	24,553
Total	1,688,903	1,826,867
Performing [Member] | Loans to individuals [Member] | Residential mortgage [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0	33
Financing Receivable, Originated, Year 2	0	11
Financing Receivable, Originated, Year 3	156	2,094
Financing Receivable, Originated, Year 4	0	0
Financing Receivable, Originated, Year 5	19	59
Financing Receivable, Originated, More Than Five Years	411	318
Financing Receivable, Revolving	282	950
Financing Receivable, Revolving, Converted to Term Loan	159	10
Total	1,027	3,475
Performing [Member] | Loans to individuals [Member] | Residential mortgage [Member] | Accruing Substandard [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	98	0
Financing Receivable, Originated, Year 2	0	0
Financing Receivable, Originated, Year 3	0	51
Financing Receivable, Originated, Year 4	0	0
Financing Receivable, Originated, Year 5	127	0
Financing Receivable, Originated, More Than Five Years	41	34
Financing Receivable, Revolving	400	272
Financing Receivable, Revolving, Converted to Term Loan	0	76
Total	666	433
Performing [Member] | Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans | Pass [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	699	4,859
Financing Receivable, Originated, Year 2	11,380	33,880
Financing Receivable, Originated, Year 3	20,650	34,464
Financing Receivable, Originated, Year 4	27,970	43,099
Financing Receivable, Originated, Year 5	32,742	58,264
Financing Receivable, Originated, More Than Five Years	246,871	226,380
Financing Receivable, Revolving	0	0
Financing Receivable, Revolving, Converted to Term Loan	0	0
Total	340,312	400,946
Performing [Member] | Loans to individuals [Member] | Personal [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	218,960	219,873
Financing Receivable, Originated, Year 2	180,577	200,580
Financing Receivable, Originated, Year 3	177,389	76,246
Financing Receivable, Originated, Year 4	70,249	100,229
Financing Receivable, Originated, Year 5	92,592	64,104
Financing Receivable, Originated, More Than Five Years	135,041	102,126
Financing Receivable, Revolving	638,713	510,571
Financing Receivable, Revolving, Converted to Term Loan	728	1,510
Total	1,514,249	1,275,239
Performing [Member] | Loans to individuals [Member] | Personal [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0	39
Financing Receivable, Originated, Year 2	9	55
Financing Receivable, Originated, Year 3	34	66
Financing Receivable, Originated, Year 4	3	0
Financing Receivable, Originated, Year 5	0	469
Financing Receivable, Originated, More Than Five Years	47	31
Financing Receivable, Revolving	0	965
Financing Receivable, Revolving, Converted to Term Loan	0	0
Total	93	1,625
Performing [Member] | Loans to individuals [Member] | Personal [Member] | Accruing Substandard [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	435	11
Financing Receivable, Originated, Year 2	5	214
Financing Receivable, Originated, Year 3	165	10
Financing Receivable, Originated, Year 4	0	0
Financing Receivable, Originated, Year 5	0	0
Financing Receivable, Originated, More Than Five Years	1	0
Financing Receivable, Revolving	0	29
Financing Receivable, Revolving, Converted to Term Loan	0	0
Total	606	264
Nonaccrual [Member] | Commercial [Member] | Energy [Member] | Nonaccrual
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0	21,076
Financing Receivable, Originated, Year 2	20,487	2,607
Financing Receivable, Originated, Year 3	0	0
Financing Receivable, Originated, Year 4	0	0
Financing Receivable, Originated, Year 5	0	0
Financing Receivable, Originated, More Than Five Years	714	21,064
Financing Receivable, Revolving	9,890	80,312
Financing Receivable, Revolving, Converted to Term Loan	0	0
Total	31,091	125,059
Nonaccrual [Member] | Commercial [Member] | Healthcare [Member] | Nonaccrual
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0	0
Financing Receivable, Originated, Year 2	0	18
Financing Receivable, Originated, Year 3	0	183
Financing Receivable, Originated, Year 4	6,542	0
Financing Receivable, Originated, Year 5	0	0
Financing Receivable, Originated, More Than Five Years	8,711	2,935
Financing Receivable, Revolving	509	509
Financing Receivable, Revolving, Converted to Term Loan	0	0
Total	15,762	3,645
Nonaccrual [Member] | Commercial [Member] | Services [Member] | Nonaccrual
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0	4,833
Financing Receivable, Originated, Year 2	0	448
Financing Receivable, Originated, Year 3	0	0
Financing Receivable, Originated, Year 4	230	12,590
Financing Receivable, Originated, Year 5	13,918	1,049
Financing Receivable, Originated, More Than Five Years	2,519	6,138
Financing Receivable, Revolving	503	540
Financing Receivable, Revolving, Converted to Term Loan	0	0
Total	17,170	25,598
Nonaccrual [Member] | Commercial [Member] | General business [Member] | Nonaccrual
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0	1,675
Financing Receivable, Originated, Year 2	2,444	3,728
Financing Receivable, Originated, Year 3	4,562	4,863
Financing Receivable, Originated, Year 4	1,046	1,436
Financing Receivable, Originated, Year 5	762	530
Financing Receivable, Originated, More Than Five Years	518	107
Financing Receivable, Revolving	730	477
Financing Receivable, Revolving, Converted to Term Loan	19	41
Total	10,081	12,857
Nonaccrual [Member] | Commercial real estate [Member] | Nonaccrual
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0	0
Financing Receivable, Originated, Year 2	0	8,300
Financing Receivable, Originated, Year 3	8,076	0
Financing Receivable, Originated, Year 4	0	232
Financing Receivable, Originated, Year 5	0	7,468
Financing Receivable, Originated, More Than Five Years	6,186	11,246
Financing Receivable, Revolving	0	0
Financing Receivable, Revolving, Converted to Term Loan	0	0
Total	14,262	27,246
Nonaccrual [Member] | Loans to individuals [Member] | Residential mortgage [Member] | Nonaccrual
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	1,516	648
Financing Receivable, Originated, Year 2	1,809	104
Financing Receivable, Originated, Year 3	383	1,658
Financing Receivable, Originated, Year 4	1,968	784
Financing Receivable, Originated, Year 5	629	2,010
Financing Receivable, Originated, More Than Five Years	22,289	22,415
Financing Receivable, Revolving	2,177	3,835
Financing Receivable, Revolving, Converted to Term Loan	803	774
Total	31,574	32,228
Nonaccrual [Member] | Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans | Nonaccrual
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0	0
Financing Receivable, Originated, Year 2	0	0
Financing Receivable, Originated, Year 3	1,259	545
Financing Receivable, Originated, Year 4	821	0
Financing Receivable, Originated, Year 5	635	309
Financing Receivable, Originated, More Than Five Years	11,146	6,887
Financing Receivable, Revolving	0	0
Financing Receivable, Revolving, Converted to Term Loan	0	0
Total	13,861	7,741
Nonaccrual [Member] | Loans to individuals [Member] | Personal [Member] | Nonaccrual
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	110	28
Financing Receivable, Originated, Year 2	14	17
Financing Receivable, Originated, Year 3	10	57
Financing Receivable, Originated, Year 4	24	73
Financing Receivable, Originated, Year 5	35	50
Financing Receivable, Originated, More Than Five Years	40	49
Financing Receivable, Revolving	25	45
Financing Receivable, Revolving, Converted to Term Loan	0	0
Total	$ 258	$ 319

Loans and Allowances for Cred_6

Loans and Allowances for Credit Losses, Nonaccrual (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	$ 134,059	$ 234,693
Financing Receivable, Nonaccrual, No Allowance	114,025	167,878
Financing receivable, Nonaccrual, With Allowance	20,034	66,815
Financing Receivable, Nonaccrual, Related Allowance	6,343	22,441
Commercial [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	74,104	167,159
Financing Receivable, Nonaccrual, No Allowance	62,146	113,945
Financing receivable, Nonaccrual, With Allowance	11,958	53,214
Financing Receivable, Nonaccrual, Related Allowance	3,994	19,052
Commercial [Member] | Energy [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	31,091	125,059
Financing Receivable, Nonaccrual, No Allowance	31,091	76,633
Financing receivable, Nonaccrual, With Allowance	0	48,426
Financing Receivable, Nonaccrual, Related Allowance	0	16,478
Commercial [Member] | Healthcare [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	15,762	3,645
Financing Receivable, Nonaccrual, No Allowance	9,679	3,645
Financing receivable, Nonaccrual, With Allowance	6,083	0
Financing Receivable, Nonaccrual, Related Allowance	53	0
Commercial [Member] | Services [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	17,170	25,598
Financing Receivable, Nonaccrual, No Allowance	13,686	20,810
Financing receivable, Nonaccrual, With Allowance	3,484	4,788
Financing Receivable, Nonaccrual, Related Allowance	2,584	2,574
Commercial [Member] | General business [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	10,081	12,857
Financing Receivable, Nonaccrual, No Allowance	7,690	12,857
Financing receivable, Nonaccrual, With Allowance	2,391	0
Financing Receivable, Nonaccrual, Related Allowance	1,357	0
Commercial real estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	14,262	27,246
Financing Receivable, Nonaccrual, No Allowance	6,186	13,645
Financing receivable, Nonaccrual, With Allowance	8,076	13,601
Financing Receivable, Nonaccrual, Related Allowance	2,349	3,389
Loans to individuals [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	45,693	40,288
Financing Receivable, Nonaccrual, No Allowance	45,693	40,288
Financing receivable, Nonaccrual, With Allowance	0	0
Financing Receivable, Nonaccrual, Related Allowance	0	0
Loans to individuals [Member] | Residential mortgage [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	31,574	32,228
Financing Receivable, Nonaccrual, No Allowance	31,574	32,228
Financing receivable, Nonaccrual, With Allowance	0	0
Financing Receivable, Nonaccrual, Related Allowance	0	0
Loans to individuals [Member] | Personal [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	258	319
Financing Receivable, Nonaccrual, No Allowance	258	319
Financing receivable, Nonaccrual, With Allowance	0	0
Financing Receivable, Nonaccrual, Related Allowance	0	0
US Government Agency Insured Loans | Loans to individuals [Member] | Residential mortgage [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	13,861	7,741
Financing Receivable, Nonaccrual, No Allowance	13,861	7,741
Financing receivable, Nonaccrual, With Allowance	0	0
Financing Receivable, Nonaccrual, Related Allowance	$ 0	$ 0

Loans and Allowances for Cred_7

Loans and Allowances for Credit Losses, Troubled Debt Restructurings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled Debt Restructuring, Recorded Investment	$ 273,000	$ 187,000
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	141,000	95,000
Troubled Debt Restructuring, Charge-offs	994	20,900
Troubled Debt Restructurings, Recorded Balance Modified During The Period	121,000	83,000
US Government Agency Insured Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	97,000
US Government Agency Insured Loans | Residential mortgage [Member] | Loans to individuals [Member] | Accruing [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled Debt Restructuring, Recorded Investment	$ 211,000	$ 152,000

Loans and Allowances for Cred_8

Loans and Allowances for Credit Losses, By Aging Category (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Past Due 90 Days or More and Accruing	$ 119,132	$ 88,718
Current and Past Due Performing Loans	20,205,680	23,007,520
30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	43,102	68,013
60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	27,870	38,782
90 Days or More [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	153,861	182,227
Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	19,980,847	22,718,498
Commercial [Member]
Financing Receivable, Past Due [Line Items]
Past Due 90 Days or More and Accruing	199	4,821
Current and Past Due Performing Loans	12,506,465	13,077,535
Commercial [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	9,904	17,219
Commercial [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	9,333	10,504
Commercial [Member] | 90 Days or More [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	14,298	71,011
Commercial [Member] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	12,472,930	12,978,801
Commercial [Member] | Energy [Member]
Financing Receivable, Past Due [Line Items]
Past Due 90 Days or More and Accruing	0	0
Current and Past Due Performing Loans	3,006,884	3,469,194
Commercial [Member] | Energy [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	545	12,735
Commercial [Member] | Energy [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	3,716	4,050
Commercial [Member] | Energy [Member] | 90 Days or More [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	0	41,414
Commercial [Member] | Energy [Member] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	3,002,623	3,410,995
Commercial [Member] | Healthcare [Member]
Financing Receivable, Past Due [Line Items]
Past Due 90 Days or More and Accruing	0	0
Current and Past Due Performing Loans	3,414,940	3,305,990
Commercial [Member] | Healthcare [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	2,359	0
Commercial [Member] | Healthcare [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	0	0
Commercial [Member] | Healthcare [Member] | 90 Days or More [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	509	3,645
Commercial [Member] | Healthcare [Member] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	3,412,072	3,302,345
Commercial [Member] | Services [Member]
Financing Receivable, Past Due [Line Items]
Past Due 90 Days or More and Accruing	0	326
Current and Past Due Performing Loans	3,367,193	3,508,583
Commercial [Member] | Services [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	920	3,278
Commercial [Member] | Services [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	4,620	177
Commercial [Member] | Services [Member] | 90 Days or More [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	9,014	15,705
Commercial [Member] | Services [Member] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	3,352,639	3,489,423
Commercial [Member] | General business [Member]
Financing Receivable, Past Due [Line Items]
Past Due 90 Days or More and Accruing	199	4,495
Current and Past Due Performing Loans	2,717,448	2,793,768
Commercial [Member] | General business [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	6,080	1,206
Commercial [Member] | General business [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	997	6,277
Commercial [Member] | General business [Member] | 90 Days or More [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	4,775	10,247
Commercial [Member] | General business [Member] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	2,705,596	2,776,038
Commercial real estate [Member]
Financing Receivable, Past Due [Line Items]
Past Due 90 Days or More and Accruing	0	5,126
Current and Past Due Performing Loans	3,831,325	4,698,538
Commercial real estate [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	0	276
Commercial real estate [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	206	5,310
Commercial real estate [Member] | 90 Days or More [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	3,157	20,673
Commercial real estate [Member] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	3,827,962	4,672,279
Paycheck Protection Program
Financing Receivable, Past Due [Line Items]
Past Due 90 Days or More and Accruing	74	0
Current and Past Due Performing Loans	276,341	1,682,310
Paycheck Protection Program | 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	0	0
Paycheck Protection Program | 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	0	0
Paycheck Protection Program | 90 Days or More [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	0	0
Paycheck Protection Program | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	276,341	1,682,310
Loans to individuals [Member]
Financing Receivable, Past Due [Line Items]
Past Due 90 Days or More and Accruing	118,859	78,771
Current and Past Due Performing Loans	3,591,549	3,549,137
Loans to individuals [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	33,198	50,518
Loans to individuals [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	18,331	22,968
Loans to individuals [Member] | 90 Days or More [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	136,406	90,543
Loans to individuals [Member] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	3,403,614	3,385,108
Loans to individuals [Member] | Residential mortgage [Member]
Financing Receivable, Past Due [Line Items]
Past Due 90 Days or More and Accruing	0	181
Current and Past Due Performing Loans	1,722,170	1,863,003
Loans to individuals [Member] | Residential mortgage [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	6,263	5,812
Loans to individuals [Member] | Residential mortgage [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	1,556	837
Loans to individuals [Member] | Residential mortgage [Member] | 90 Days or More [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	6,697	7,050
Loans to individuals [Member] | Residential mortgage [Member] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	1,707,654	1,849,304
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans
Financing Receivable, Past Due [Line Items]
Past Due 90 Days or More and Accruing	118,819	78,349
Current and Past Due Performing Loans	354,173	408,687
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans | 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	26,869	41,389
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans | 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	16,751	22,041
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans | 90 Days or More [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	129,531	83,155
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	181,022	262,102
Loans to individuals [Member] | Personal [Member]
Financing Receivable, Past Due [Line Items]
Past Due 90 Days or More and Accruing	40	241
Current and Past Due Performing Loans	1,515,206	1,277,447
Loans to individuals [Member] | Personal [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	66	3,317
Loans to individuals [Member] | Personal [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	24	90
Loans to individuals [Member] | Personal [Member] | 90 Days or More [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	178	338
Loans to individuals [Member] | Personal [Member] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	$ 1,514,938	$ 1,273,702

Premises and Equipment and Le_3

Premises and Equipment and Leases Premises and Equipment and Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Premises and Equipment [Line Items]
Premises and equipment	$ 924,298	$ 843,041
Less accumulated depreciation	350,150	291,733
Premises and equipment, net of accumulated depreciation	574,148	551,308
Depreciation Expense	$ 63,400	54,300	$ 51,600
Lease, Cost [Abstract]
Operating Lease, Weighted Average Remaining Lease Term	10 years 10 months 24 days
Operating Lease, Weighted Average Discount Rate, Percent	2.90%
Operating Lease, costs recognized as occupancy and equipment expense	$ 23,400	25,000	24,200
Operating Lease, operating cash flows	25,300	25,600
Lease, Cost	35,800	42,000	43,000
Short-term Lease, Cost	11,500	13,400	$ 12,600
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
Operating Leases, Payments Due, 2022	23,800
Operating Leases, Payments, 2023	24,700
Operating Leases, Payments, 2024	24,300
Operating Leases, Payments, 2025	23,600
Operating Lease, Payments, 2026	22,600
Operating Leases, Payments, 2027 and later	130,000
Premises and equipment, net
Premises and Equipment [Line Items]
Operating Lease, Right-of-Use Asset	181,000	166,000
Lease, Cost [Abstract]
Operating Lease, Right-of-Use Asset	181,000	166,000
Land
Premises and Equipment [Line Items]
Premises and equipment	69,776	69,776
Buildings and improvements
Premises and Equipment [Line Items]
Premises and equipment	472,450	440,528
Software and related integration
Premises and Equipment [Line Items]
Premises and equipment	159,063	120,444
Furniture and equipment
Premises and Equipment [Line Items]
Premises and equipment	186,092	165,344
Construction in progress
Premises and Equipment [Line Items]
Premises and equipment	$ 36,917	$ 46,949

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, net	$ 91,778	$ 113,436
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2022	15,646
2023	13,770
2024	11,990
2025	10,876
2026	9,814
Thereafter	29,682
Goodwill [Roll Forward]
Goodwill, Beginning Balance	1,048,091
Sale of consolidated merchant banking investment during 2021	(3,342)
Goodwill, Ending Balance	1,044,749
Commercial [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance	913,931
Sale of consolidated merchant banking investment during 2021	(3,342)
Goodwill, Ending Balance	910,589
Consumer [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance	43,458
Sale of consolidated merchant banking investment during 2021	0
Goodwill, Ending Balance	43,458
Wealth Management [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance	90,702
Sale of consolidated merchant banking investment during 2021	0
Goodwill, Ending Balance	90,702
Funds Management and Other [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance	0
Sale of consolidated merchant banking investment during 2021	0
Goodwill, Ending Balance	0
Core deposits premiums [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	103,200	103,200
Accumulated amortization	44,149	32,256
Finite-lived intangible assets, net	59,051	70,944
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2022	10,981
2023	10,145
2024	9,379
2025	8,675
2026	7,986
Thereafter	11,885
Other identifiable intangible assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	78,154	82,731
Accumulated amortization	45,427	40,239
Finite-lived intangible assets, net	32,727	$ 42,492
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2022	4,665
2023	3,625
2024	2,611
2025	2,201
2026	1,828
Thereafter	$ 17,797

Mortgage Banking Activities, Co

Mortgage Banking Activities, Components of Loans Held For Sale (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule of Residential Mortgage Loans Held For Sale [Line Items]
Number of days for past due for a residential mortgage loan to be considered nonperforming (in days)	90 days	90 days
Residential mortgage loans held for sale, nonperforming	$ 0	$ 0
Credit losses recognized on residential mortgage loans held for sale	0	0	$ 0
Components of Residential Mortgage Loans Held for Sale [Abstract]
Unpaid principal balance	182,710	227,161
Residential mortgage loans held for sale, Fair value	186,175	236,444
Residential mortgage loans held for sale	$ 192,295	$ 252,316
Not Designated as Hedging Instrument [Member] | Residential mortgage loan commitments [Member]
Schedule of Residential Mortgage Loans Held For Sale [Line Items]
General number of days outstanding for residential mortgage commitments, minimum (in days)	60 days	60 days
General number of days outstanding for residential mortgage commitments, maximum (in days)	90 days	90 days
Components of Residential Mortgage Loans Held for Sale [Abstract]
Derivative, Notional Amount	$ 171,412	$ 380,637
Derivative, Net fair value	$ 6,167	$ 20,435
Not Designated as Hedging Instrument [Member] | Forward sales contracts [Member]
Schedule of Residential Mortgage Loans Held For Sale [Line Items]
General number of days for delivery of loans, for which the price is set by forward sales contracts, minimum (in days)	60 days	60 days
General number of days for delivery of loans, for which the price is set by forward sales contracts, maximum (in days)	90 days	90 days
Components of Residential Mortgage Loans Held for Sale [Abstract]
Derivative, Notional Amount	$ 328,433	$ 549,414
Derivative, Net fair value	$ (47)	$ (4,563)

Mortgage Banking Activities, Mo

Mortgage Banking Activities, Mortgage Banking Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Mortgage Banking Revenue [Abstract]
Net realized gains on sales of mortgage loans	$ 76,282	$ 107,847	$ 39,730
Net change in unrealized gain on mortgage loans held for sale	(5,818)	6,697	672
Net change in fair value of mortgage loan commitments	(14,268)	15,202	(145)
Net change in the fair value of forward sales contracts	4,516	(3,898)	2,463
Total mortgage production revenue	60,712	125,848	42,720
Servicing revenue	45,184	56,512	64,821
Total mortgage banking revenue	$ 105,896	$ 182,360	$ 107,541

Mortgage Banking Activities, _2

Mortgage Banking Activities, Mortgage Servicing Rights (Details)	12 Months Ended
	Dec. 31, 2021USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Summary of Mortgage Servicing Rights [Abstract]
Number of residential mortgage loans serviced for others	102,008	106,201	126,828
Outstanding principal balance of residential mortgage loans serviced for others	$ 16,442,446,000	$ 16,228,449,000	$ 20,727,106,000
Weighted average interest rate (in hundredths)	3.58%	3.84%	3.98%
Remaining contractual term (in months)	281 months	280 months	289 months
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance	$ 101,172,000	$ 201,886,000	$ 259,254,000
Additions	31,132,000	31,209,000	35,128,000
Acquisitions	28,018,000
Disposals		(10,801,000)
Change in fair value due to loan runoff	(38,761,000)	(41,598,000)	(38,979,000)
Change in fair value due to market changes	41,637,000	(79,524,000)	(53,517,000)
Ending balance	$ 163,198,000	$ 101,172,000	$ 201,886,000
Servicing Assets at Fair Value, Assumptions Used to Estimate Fair Value [Abstract]
Discount rate - risk-free rate plus a market premium (in hundredths)	8.39%	9.14%
Prepayment rate - based upon loan interest rate, original term and loan type	12.11%	19.73%
Loan servicing costs - annually per loan based upon loan type, performing, minimum (in dollars per loan)	$ 69	$ 69
Loan servicing costs - annually per loan based upon loan type, performing, maximum (in dollars per loan)	94	94
Loan servicing costs - annually per loan based upon loan type, delinquent, minimum (in dollars per loan)	150	150
Loan servicing costs - annually per loan based upon loan type, delinquent, maximum (in dollars per loan)	500	500
Loan servicing costs - annually per loan based upon loan type, foreclosure, minimum (in dollars per loan)	1,000	1,000
Loan servicing costs - annually per loan based upon loan type, foreclosure, maximum (in dollars per loan)	$ 4,000	$ 4,000
Primary secondary mortgage rate spread (in basis points)	105	105
Escrow earnings rate - indexed to rates paid on deposit accounts with comparable average life	1.32%	0.43%
Delinquency rate	2.05%	3.54%

Deposits (Details)

Deposits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Interest expense on deposits [Abstract]
Transaction deposits	$ 21,961	$ 60,424	$ 132,854
Savings	374	385	677
Time Deposit, Interest Expense [Abstract]
Certificates of deposits under $100,000	2,961	6,741	8,299
Certificates of deposits $100,000 and over	4,719	18,270	29,288
Other time deposits	3,469	4,176	4,420
Total time	11,149	29,187	42,007
Total	33,484	89,996	$ 175,538
Time Deposit Information [Abstract]
Time deposits in denomination of $250,000 or more	828,000	815,000
Time Deposit Maturities [Abstract]
2022	1,300,000
2023	156,000
2024	54,000
2025	39,000
2026	82,000
Thereafter	25,000
Other Deposits Information [Abstract]
Overdrawn customer transaction deposits reclassified as loan balances	$ 3,400	$ 3,100

Other Borrowed Funds (Details)

Other Borrowed Funds (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021		Dec. 31, 2020	Dec. 31, 2019
Other Borrowed Funds [Line Items]
Balance		$ 2,494,428		$ 3,821,361	$ 8,621,328
Average Balance		$ 5,062,621		$ 8,570,959	$ 10,261,592
Rate		0.56%		0.82%	2.37%
Other borrowed funds, Maturities [Abstract]
2022		$ 2,343,341
2023		3,378
2024		3,498
2025		3,622
2026		3,752
Thereafter		136,837
Funds purchased [Member]
Other Borrowed Funds [Line Items]
Balance		$ 199,513		$ 769,365	$ 3,390,528
Rate		0.05%		0.05%	1.53%
Average Balance		$ 543,183		$ 2,045,795	$ 2,438,376
Rate		0.46%		0.58%	2.08%
Maximum Outstanding At Any Month End		$ 542,465		$ 3,311,938	$ 3,390,528
Repurchase agreements [Member]
Other Borrowed Funds [Line Items]
Balance		$ 2,126,936		$ 893,021	$ 427,822
Rate		0.08%		0.09%	0.50%
Average Balance		$ 1,695,519		$ 1,589,746	$ 399,785
Rate		0.33%		0.24%	0.57%
Maximum Outstanding At Any Month End		$ 2,920,728		$ 3,230,097	$ 427,822
Other Borrowings [Member]
Other Borrowed Funds [Line Items]
Balance		36,753		1,882,970	4,527,055
Average Balance		$ 2,599,861		$ 4,659,453	$ 7,147,356
Rate		0.38%		0.88%	2.45%
Federal Home Loan Bank advances [Member]
Other Borrowed Funds [Line Items]
Balance		$ 0		$ 200,000	$ 4,500,000
Rate		0.00%		0.29%	1.79%
Average Balance		$ 1,679,315		$ 3,393,989	$ 7,122,466
Rate		0.27%		1.00%	2.44%
Maximum Outstanding At Any Month End		$ 2,600,000		$ 7,500,000	$ 8,000,000
GNMA repurchase liability [Member]
Other Borrowed Funds [Line Items]
Balance		$ 7,420		$ 19,500	$ 15,417
Rate		4.36%		4.35%	4.32%
Average Balance		$ 11,956		$ 42,771	$ 13,746
Rate		4.06%		4.18%	4.47%
Maximum Outstanding At Any Month End		$ 23,856		$ 126,569	$ 19,581
Federal Reserve Bank Advances
Other Borrowed Funds [Line Items]
Balance				$ 0
Rate				0.00%
Average Balance				$ 42,464
Rate				0.26%
Maximum Outstanding At Any Month End				$ 0
Paycheck protection program liquidity facility
Other Borrowed Funds [Line Items]
Balance		$ 0		$ 1,635,963
Rate		0.00%		0.35%
Average Balance		$ 879,145		$ 1,152,073
Rate		0.35%		0.35%
Maximum Outstanding At Any Month End		$ 1,662,598		$ 2,013,414
Other [Member]
Other Borrowed Funds [Line Items]
Balance		$ 29,333		$ 27,507	$ 11,638
Rate		3.23%		5.24%	5.09%
Average Balance		$ 29,445		$ 28,156	$ 11,144
Rate		4.18%		5.12%	5.30%
Maximum Outstanding At Any Month End		$ 31,875		$ 49,376	$ 34,676
Subordinated debentures [Member]
Other Borrowed Funds [Line Items]
Balance	[1]	$ 131,226		$ 276,005	$ 275,923
Rate	[1]	3.95%		4.72%	5.15%
Average Balance	[1]	$ 224,058		$ 275,965	$ 276,075
Rate	[1]	4.70%		5.05%	5.47%
Maximum Outstanding At Any Month End	[1]	$ 276,049		$ 276,005	$ 275,923
Subordinated debentures [Member] | Subordinated debentures, 2016 issuance [Member]
Other borrowed funds, Other Disclosures [Abstract]
Amount of debt issuance		$ 150,000
Maturity date		Jun. 30, 2056
Stated interest rate		5.375%
Gain (Loss) on Extinguishment of Debt		$ 5,200
Subordinated debentures [Member] | Subordinated debentures-acquired, 2015 Issuance [Member]
Other borrowed funds, Other Disclosures [Abstract]
Amount of debt issuance		$ 60,000
Maturity date		Jun. 25, 2030
Interest rate description		three-month LIBOR plus 3.17%
Stated interest rate		5.625%
Debt Instrument, Call Date, Earliest		Jun. 25, 2025
Subordinated debentures [Member] | Junior subordinated debentures-acquired, 2003 issuance [Member]
Other borrowed funds, Other Disclosures [Abstract]
Amount of debt issuance		$ 21,000
Maturity date		Sep. 17, 2033
Interest rate description		three-month LIBOR plus 2.95%
Subordinated debentures [Member] | Junior subordinated debentures-acquired, 2004 issuance [Member]
Other borrowed funds, Other Disclosures [Abstract]
Amount of debt issuance		$ 31,000
Maturity date		Jul. 23, 2034
Interest rate description		three-month LIBOR plus 2.60%
Subordinated debentures [Member] | Junior subordinated debentures-acquired, 2005 issuance [Member]
Other borrowed funds, Other Disclosures [Abstract]
Amount of debt issuance		$ 20,000
Maturity date		Sep. 30, 2035
Interest rate description		three-month LIBOR plus 1.45%
U.S. government agency mortgage-backed securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amortized Cost		$ 907,154		893,069
Fair Value		2,144,507		910,885
Repurchase Liability	[2]	$ 2,126,936		$ 893,021
Average Rate (in hundredths)		1.58%		0.09%
U.S. government agency mortgage-backed securities [Member] | Overnight [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amortized Cost		$ 907,154		$ 893,069
Fair Value		902,507		910,885
Repurchase Liability	[2]	$ 884,936		$ 893,021
Average Rate (in hundredths)		0.08%		0.09%
U.S. government agency mortgage-backed securities [Member] | Less than 30 Days
Assets Sold under Agreements to Repurchase [Line Items]
Amortized Cost				$ 0
Fair Value		$ 1,242,000	[3]	0
Repurchase Liability	[2]	$ 1,242,000	[3]	$ 0
Average Rate (in hundredths)		1.50%	[3]	0.00%
Subsidiaries [Member] | Funds purchased [Member]
Other borrowed funds, Other Disclosures [Abstract]
Number of days to maturity, minimum		1 day
Number of days to maturity, maximum		90 days
Subsidiaries [Member] | Repurchase agreements [Member]
Other borrowed funds, Other Disclosures [Abstract]
Number of days to maturity, maximum		90 days
Subsidiaries [Member] | Federal Home Loan Bank advances [Member]
Other borrowed funds, Other Disclosures [Abstract]
Federal Home Loan Banks, Letters of credit issued to secure public funds		$ 500,000
Unused credit available pursuant to the FHLB's collateral policies		5,900,000
Subsidiaries [Member] | BOK Financial Securities, Inc. [Member] | Other [Member]
Other Borrowed Funds [Line Items]
Balance		$ 0		$ 0
[1]	Parent Company only.
[2]	BOK Financial maintains control over the securities underlying overnight repurchase agreements and generally transfers control over securities underlying longer-term dealer repurchase agreements to the respective counterparty.
[3]	Trading position.

Federal and State Income Taxe_2

Federal and State Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets [Abstract]
Credit loss reserves	$ 67,339	$ 101,265
Lease liability	48,457	44,794
Deferred compensation	33,945	29,504
Unearned fees	11,368	14,584
Purchased loan discount	7,498	11,537
Share-based compensation	5,989	6,525
Valuation adjustments	1,883	3,834
Other	28,958	29,963
Total deferred tax assets	205,437	242,006
Valuation Allowance [Abstract]
Valuation allowance	0	0
Deferred tax liabilities [Abstract]
Available for sale securities mark to market	21,841	105,769
Right-of-use asset	41,291	38,635
Mortgage servicing rights	31,703	24,182
Acquired identifiable intangible	14,307	18,138
Depreciation	10,939	13,754
Lease financing	11,120	11,828
Other	39,698	39,210
Total deferred tax liabilities	170,899	251,516
Net deferred tax assets, net	34,538
Net deferred liabilities, net		(9,510)
Current income tax expense [Abstract]
Federal	121,196	173,888	$ 110,887
State	21,065	29,889	15,088
Total current income tax expense	142,261	203,777	125,975
Deferred income tax expense [Abstract]
Federal	29,777	(65,989)	3,416
State	7,737	(8,995)	792
Total deferred income tax expense (benefit)	37,514	(74,984)	4,208
Total income tax expense	179,775	128,793	130,183
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Federal statutory tax	167,181	118,412	132,482
Tax exempt revenue	(6,084)	(7,035)	(12,227)
Effect of state income taxes, net of federal benefit	22,489	14,251	12,715
Utilization of tax credits, net of proportional amortization of low-income housing limited partnership investments	(8,801)	(6,994)	(5,127)
Other, net	4,990	10,159	2,340
Total income tax expense	$ 179,775	$ 128,793	$ 130,183
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Federal statutory tax (in thousandths)	21.00%	21.00%	21.00%
Tax exempt revenue (in thousandths)	(0.70%)	(1.20%)	(1.90%)
Effect of state income taxes, net of federal benefit (in thousandths)	2.80%	2.50%	2.00%
Utilization of tax credits, net of proportional amortization of low-income housing limited partnership investments (in thousandths)	(1.10%)	(1.20%)	(0.80%)
Other, net (in thousandths)	0.60%	1.70%	0.30%
Total (in thousandths)	22.60%	22.80%	20.60%
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance as of January 1	$ 22,902	$ 20,465	$ 18,869
Additions for tax for current year positions	3,961	6,384	5,649
Settlements during the period	(1,754)	0	0
Lapses of applicable statute of limitations	(4,017)	(3,947)	(4,053)
Balance as of December 31	21,092	22,902	20,465
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	16,400
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	2,300	2,400	$ 2,200
Unrecognized Tax Benefits, Penalties and Interest Accrued	$ 6,400	$ 5,900
Unrecognized Tax Benefits, Number of Reporting Periods Open for Examination, Federal	3
Unrecognized Tax Benefits, Number of Reporting Periods Open for Examination, State, Minimum	3
Unrecognized Tax Benefits, Number of Reporting Periods Open for Examination, State, Maximum	6

Employee Benefits (Details)

Employee Benefits (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
BOK Financial Pension Plan [Member] | Pension Plan [Member]
BOK Financial Pension Plan [Abstract]
Interest percentage added to the five-year trailing average of five-year Treasury Securities	1.50%
Interest percentage accrued on employee account balances, Minimum	3.00%
Interest percentage accrued on employee account balances, Maximum	5.00%
Quarterly variable interest percentage accrued on employee account balances, minimum	3.13%
Quarterly variable interest percentage accrued on employee account balances, maximum	3.22%
Defined Benefit Plan, Benefit Obligation	$ 20,000,000	$ 24,000,000
Net periodic benefit cost (credit)	(2,200,000)	$ (1,300,000)	$ (815,000)
Total estimated future benefit payments	$ 22,400,000
BOK Financial Pension Plan Weighted-average Assumptions [Abstract]
Discount rate (in hundredths)	1.73%	2.69%
Expected return on plan assets (in hundredths)	5.50%	5.50%
BOK Financial Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] | Pension Plan [Member]
BOK Financial Pension Plan [Abstract]
Defined Benefit Plan, Plan Assets, Amount	$ 39,000,000	$ 38,000,000
BOK Financial Pension Plan [Member] | Equity Securities [Member] | Pension Plan [Member]
BOK Financial Pension Plan [Abstract]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	60.00%
BOK Financial Pension Plan [Member] | Bonds [Member] | Pension Plan [Member]
BOK Financial Pension Plan [Abstract]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	40.00%
BOK Financial 401(k) Plan [Member]
BOK Financial 401(k) Plan [Abstract]
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	6.00%
Defined Contribution Plan, Minimum Years of Service for Employees to Obtain Maximum Employer Matching	4 years
Defined Contribution Plan, Maximum Years of Service for Employees to Obtain Minimum Employer Matching	15 years
Contributions Non-Elective Annual Contributions For Qualified Employees	$ 750
Defined Contribution Plan, Annual Base Employee Compensation to Qualify for Non-Elective Employer Contributions, Maximum	$ 40,000
Defined Contribution Plan, Vesting Period for Employer Contributions	5 years
Defined Contribution Plan, Cost	$ 30,500,000	$ 29,900,000	$ 27,600,000
BOK Financial 401(k) Plan [Member] | Minimum [Member]
BOK Financial 401(k) Plan [Abstract]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	50.00%
BOK Financial 401(k) Plan [Member] | Maximum [Member]
BOK Financial 401(k) Plan [Abstract]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	200.00%

Share-Based Compensation Plan_2

Share-Based Compensation Plans (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Stock Options [Member]
Share-based Compensation Arrangements by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options exercised, aggregate intrinsic value	$ 496	$ 318	$ 761
Restricted Stock [Member]
Share-based Compensation Arrangements by Share-based Payment Award, Restricted Stock, Nonvested, Number of Shares [Roll Forward]
Non-vested shares awarded, beginning of period (in shares)	420,234	427,178	527,607
Non-vested shares that were granted during the period (in shares)	247,917	236,750	145,724
Non-vested shares that vested during period (in shares)	(166,965)	(225,527)	(114,201)
Non-vested shares that forfeited during period (in shares)	(11,632)	(18,167)	(131,952)
Non-vested shares awarded, end of period (in shares)	489,554	420,234	427,178
Share-based Compensation Arrangements by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted Average Grant Date Fair Value, Granted	$ 73.01	$ 83.49	$ 76.74
Weighted Average Grant Date Fair Value, Vested	94.96	83.50	61.28
Weighted average grant date fair value non-vested share awards forfeited (in dollars per share)	$ 75.83	$ 83.10	$ 83.69
Share-based Compensation Costs, Including Costs That May Be Recognized As Future Expense [Abstract]
Share-based Compensation Expense Recognized	$ 9,300	$ 16,000	$ 15,100
Unrecognized compensation cost of unvested awards, for future periods	12,600
Unrecognized compensation cost of unvested awards, Amount to be expensed in 2022	8,300
Unrecognized compensation cost of unvested awards, Amount to be expensed in 2023	4,100
Unrecognized compensation cost of unvested awards, Amount to be expensed in 2024	$ 224
Number of shares with required performance obligations	101,495
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangements by Share-based Payment Award, Restricted Stock, Nonvested, Number of Shares [Roll Forward]
Non-vested shares awarded, beginning of period (in shares)	69,669	46,689	0
Non-vested shares that were granted during the period (in shares)	17,570	22,980	46,689
Non-vested shares that vested during period (in shares)	0	0	0
Non-vested shares that forfeited during period (in shares)	0	0	0
Non-vested shares awarded, end of period (in shares)	87,239	69,669	46,689
Share-based Compensation Arrangements by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted Average Grant Date Fair Value, Granted	$ 88.25	$ 77.36	$ 87.40
Weighted Average Grant Date Fair Value, Vested	0	0	0
Weighted average grant date fair value non-vested share awards forfeited (in dollars per share)	$ 0	$ 0	$ 0

Related Parties Related Parti_2

Related Parties Related Parties (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Directors and Senior Management [Member]
Loans and Leases Receivable, Related Parties [Roll Forward]
Beginning balance		$ 92,940	$ 75,189
Advances		588,252	498,425
Payments		(583,040)	(484,958)
Adjustments	[1]	(2,933)	4,284
Ending balance		95,219	92,940	$ 75,189
Director [Member]
Loan Commitments and Equity Investments [Abstract]
Related Party Transaction, Expenses from Transactions with Related Party		$ 10,400	10,000	$ 10,000
Executive Officer [Member]
Loan Commitments and Equity Investments [Abstract]
Percentage of investment funds' assets held by clients		81.00%
Assets Held in Cavanal Hill Funds		$ 4,000,000
Subsidiaries [Member] | BOKF, NA [Member] | Affiliated Entity [Member]
Loan Commitments and Equity Investments [Abstract]
Maximum percentage of unimpaired capital on loan commitments and equity investments to a single affiliate (in hundredths)		10.00%
Maximum percentage of unimpaired capital on loan commitments and equity investments to all affiliates (in hundredths)		20.00%
Maximum loan commitments and equity investments to a single affiliate		$ 416,000
Maximum loan commitments and equity investments to all affiliates		833,000
Largest loan commitment and equity investment to a single affiliate		264,000
Aggregate loan commitment and equity investment to all affiliates		324,000	324,000
Outstanding amounts to all affiliates		5,000	$ 5,300
Largest amount outstanding to a single affiliate		$ 4,000
[1]	Adjustments generally consist of changes in status as a related party.

Commitments and Contingent Li_2

Commitments and Contingent Liabilities (Details)	12 Months Ended
	Dec. 31, 2021USD ($)shares	Dec. 31, 2020USD ($)
Other Commitments [Abstract]
The Net Asset Value of Units in Mutual Funds (per unit)	1
Assets Purchased from Mutual Funds Managed	$ 0	$ 0
Minimum Average Cash Balance Required to be Maintained at Federal Reserve by Subsidiary Bank	905,000,000	$ 727,000,000
Misuse of Revenues Pledged to Municipal Bonds [Member] | Judicial Ruling [Member]
Litigation Settlement [Abstract]
Disgorged fees	1,067,721
Litigation Settlement, Expense	$ 600,000
Misuse of Revenues Pledged to Municipal Bonds [Member] | Pending Litigation [Member]
Litigation Settlement [Abstract]
Loss Contingency, Number of Plaintiffs	2
Bank Participation in Fraudulent Sale of Securities by Principals [Member] | Pending Litigation [Member]
Litigation Settlement [Abstract]
Loss Contingency, Number of Plaintiffs	19
Principal amount of entered judgment against the principal individual and his wife	$ 36,805,051
Pre-judgment interest amount of entered judgment against the principal individual and his wife	10,937,831
Outstanding principal accrued interest and other amounts upon sale of facilities securing payment of the bonds	$ 20,000,000
Inclusion of Proprietary Investment Products as Investment Options in 401k Plan Whose Fees Were Too High and Performance Too Low | Pending Litigation [Member]
Litigation Settlement [Abstract]
Loss Contingency, Number of Plaintiffs	3
Bank Breached Various Fiduciary Duties Acting in its Capacity as Trustee of a Trust that was a Co-general Partner of the Partnership | Pending Litigation [Member]
Litigation Settlement [Abstract]
Loss Contingency, Damages Sought, Value	$ 60,000,000
Visa Membership [Member]
Loss Contingencies [Line Items]
Number of Visa Class B Shares Owned by Entity (in shares) | shares	252,533
Number of Visa Class A Shares Visa Class B Shares Are Convertible To (in shares) | shares	408,624

Commitments and Contingent Li_3

Commitments and Contingent Liabilities Variable Interest Entities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Other Assets [Member]
Variable Interest Entity [Line Items]
Amortization Method Qualified Affordable Housing Project Investments	$ 352	$ 290
Other Liabilities [Member]
Variable Interest Entity [Line Items]
Qualified Affordable Housing Project Investments, Commitment	$ 106	$ 94

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Numerator: [Abstract]:
Net income attributable to BOK Financial Corp. shareholders	$ 618,121	$ 435,030	$ 500,758
Less: Earnings allocated to participating securities	4,299	2,612	3,227
Numerator for basic earnings per share - income available to common shareholders	613,822	432,418	497,531
Effect of reallocating undistributed earnings of participating securities	0	0	0
Numerator for diluted earnings per share - income available to common shareholders	$ 613,822	$ 432,418	$ 497,531
Denominator: [Abstract]
Weighted average shares outstanding	69,071,511	70,259,553	71,250,081
Less: Participating securities included in weighted average shares outstanding (in shares)	479,591	418,576	462,381
Denominator for basic earnings per common share (in shares)	68,591,920	69,840,977	70,787,700
Dilutive effect of employee stock compensation plans (in shares)	2,402	3,195	14,912
Denominator for diluted earnings per common share (in shares)	68,594,322	69,844,172	70,802,612
Basic (in dollars per share)	$ 8.95	$ 6.19	$ 7.03
Diluted earnings per share (per share)	$ 8.95	$ 6.19	$ 7.03

Shareholders' Equity (Details)

Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Common Stock [Abstract]
Common stock, shares authorized (in shares)	2,500,000,000	2,500,000,000
Common stock, par value (in dollars per share)	$ 0.00006	$ 0.00006
Perpetual preferred stock [Member]
Preferred Stock [Abstract]
Preferred stock, authorized (in shares)	1,000,000,000
Preferred stock at par value (in dollars per share)	$ 0.00005
Preferred stock conversion rate	one share of Common Stock for each 36 shares of Series A Preferred Stock at the option of the holder
Preferred stock, Rate of annual cumulative dividends (in hundredths)	10.00%
Preferred stock, Liquidation preference per share	$ 0.06
Preferred stock, Aggregate liquidation preference	$ 15
Preferred Stock, Shares Outstanding	0	0	0
Common Stock [Member]
Common Stock [Abstract]
Common stock, shares authorized (in shares)	2,500,000,000
Common stock, par value (in dollars per share)	$ 0.00006
Common stock, number of vote per share	$ 1

Shareholders' Equity Regulatory

Shareholders' Equity Regulatory Capital (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Common Equity Tier 1 Capital [Abstract]
Minimum Capital Requirements, Common Equity Tier 1 to Risk Weighted Assets	4.50%	4.50%
Capital Conservation Buffer, Common Equity Tier 1 to Risk Weighted Assets	2.50%	2.50%
Minimum Capital Requirement Including Capital Conservation Buffer, Common Equity Tier 1 to Risk Weighted Assets	7.00%	7.00%
Common Equity Tier 1 Capital	$ 4,230,626	$ 3,881,912
Common Equity Tier 1 Capital to Risk Weighted Assets	0.1224	0.1195
Tier I Capital (to Risk Weighted Assets) [Abstract]
Minimum Capital Requirement, Tier 1 Capital to Risk Weighted Assets	0.0600	0.0600
Capital Conservation Buffer, Tier 1 Capital to Risk Weighted Assets	2.50%	2.50%
Minimum Capital Requirement Including Capital Conservation Buffer, Tier One to Risk Weighted Assets	8.50%	8.50%
Tier 1 Capital	$ 4,235,265	$ 3,881,912
Tier 1 Capital to Risk Weighted Assets	0.1225	0.1195
Total Capital (to Risk Weighted Assets) [Abstract]
Minimum Capital Requirement, Total Capital to Risk Weighted Assets	0.0800	0.0800
Capital Conservation Buffer, Total Capital to Risk Weighted Assets	2.50%	2.50%
Minimum Capital Requirement Including Capital Conservation Buffer, Total Capital to Risk Weighted Assets	10.50%	10.50%
Total Capital	$ 4,594,787	$ 4,489,110
Total Capital to Risk Weighted Assets	0.1329	0.1382
Tier 1 Capital (to Average Assets) [Abstract]
Minimum Capital Requirement, Tier 1 Capital to Average Assets	0.0400	0.0400
Minimum Capital Requirements Including Capital Conservation Buffer, Tier 1 Capital to Average Assets	4.00%	4.00%
Tier 1 Leverage Capital	$ 4,235,265	$ 3,881,912
Tier 1 Capital to Average Assets	0.0855	0.0828
Subsidiaries [Member] | BOKF, NA [Member]
Common Equity Tier 1 Capital [Abstract]
Common Equity Tier 1 Capital Ratio Required to be Well Capitalized	6.50%	6.50%
Minimum Capital Requirements, Common Equity Tier 1 to Risk Weighted Assets	4.50%	4.50%
Minimum Capital Requirement Including Capital Conservation Buffer, Common Equity Tier 1 to Risk Weighted Assets	4.50%	4.50%
Common Equity Tier 1 Capital	$ 3,869,454	$ 3,756,950
Common Equity Tier 1 Capital to Risk Weighted Assets	0.1127	0.1166
Tier I Capital (to Risk Weighted Assets) [Abstract]
Tier I Capital Ratio Required to be Well Capitalized	0.0800	0.0800
Minimum Capital Requirement, Tier 1 Capital to Risk Weighted Assets	0.0600	0.0600
Minimum Capital Requirement Including Capital Conservation Buffer, Tier One to Risk Weighted Assets	6.00%	6.00%
Tier 1 Capital	$ 3,871,457	$ 3,756,950
Tier 1 Capital to Risk Weighted Assets	0.1128	0.1166
Total Capital (to Risk Weighted Assets) [Abstract]
Total Capital Ratio Required to be Well Capitalized	0.1000	0.1000
Minimum Capital Requirement, Total Capital to Risk Weighted Assets	0.0800	0.0800
Minimum Capital Requirement Including Capital Conservation Buffer, Total Capital to Risk Weighted Assets	8.00%	8.00%
Total Capital	$ 4,164,940	$ 4,153,347
Total Capital to Risk Weighted Assets	0.1213	0.1289
Tier 1 Capital (to Average Assets) [Abstract]
Leverage Ratio Required to be Well Capitalized	0.0500	0.0500
Minimum Capital Requirement, Tier 1 Capital to Average Assets	0.0400	0.0400
Minimum Capital Requirements Including Capital Conservation Buffer, Tier 1 Capital to Average Assets	4.00%	4.00%
Tier 1 Leverage Capital	$ 3,871,457	$ 3,756,950
Tier 1 Capital to Average Assets	0.0784	0.0804

Shareholders' Equity Accumulate

Shareholders' Equity Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 335,868	$ 104,923	$ (72,585)
Net change in unrealized gain (loss)	(341,369)	313,796	241,047
Reclassification adjustments included in earnings: [Abstract]
Gain on available for sale securities, net	(3,704)	(9,910)	(5,597)
Other comprehensive income (loss), before income taxes	(345,073)	303,886	235,450
Federal and state income taxes	(81,576)	72,941	57,942
Other comprehensive income (loss), net of income taxes	(263,497)	230,945	177,508
Ending balance	72,371	335,868	104,923
Unrealized Gain (Loss) on Available for Sale Securities [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	335,032	104,996	(70,999)
Net change in unrealized gain (loss)	(343,730)	312,576	239,017
Reclassification adjustments included in earnings: [Abstract]
Gain on available for sale securities, net	(3,704)	(9,910)	(5,597)
Other comprehensive income (loss), before income taxes	(347,434)	302,666	233,420
Federal and state income taxes	(82,177)	72,630	57,425
Other comprehensive income (loss), net of income taxes	(265,257)	230,036	175,995
Ending balance	69,775	335,032	104,996
Unrealized Gain (Loss) on Employee Benefit Plans [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	836	(73)	(1,586)
Net change in unrealized gain (loss)	2,361	1,220	2,030
Reclassification adjustments included in earnings: [Abstract]
Gain on available for sale securities, net	0	0	0
Other comprehensive income (loss), before income taxes	2,361	1,220	2,030
Federal and state income taxes	601	311	517
Other comprehensive income (loss), net of income taxes	1,760	909	1,513
Ending balance	$ 2,596	$ 836	$ (73)

Reportable Segments (Details)

Reportable Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Net interest and dividend revenue from external sources	$ 1,118,033	$ 1,108,444	$ 1,112,879
Net interest revenue (expense) from internal sources	0	0	0
Net interest and dividend revenue	1,118,033	1,108,444	1,112,879
Provision for credit losses	(100,000)	222,592	44,000
Net interest and dividend revenue after provision for credit losses	1,218,033	885,852	1,068,879
Other operating revenue	755,775	842,320	695,233
Other operating expense	1,177,708	1,164,308	1,133,244
Net direct contribution	796,100	563,864	630,868
Gain (loss) on financial instruments, net	0	0	0
Change in fair value of mortgage servicing rights	0	0	0
Gain (loss) on repossessed assets, net	0	0	0
Corporate expense allocations	0	0	0
Net income before taxes	796,100	563,864	630,868
Federal and state income taxes	179,775	128,793	130,183
Net income	616,325	435,071	500,685
Net income (loss) attributable to Non-controlling interests	(1,796)	41	(73)
Net income attributable to BOK Financial Corp. shareholders	618,121	435,030	500,758
Average assets	50,151,703	48,704,390	42,094,347
Operating Segments [Member] | Commercial [Member]
Segment Reporting Information [Line Items]
Net interest and dividend revenue from external sources	606,902	714,932	919,148
Net interest revenue (expense) from internal sources	(71,167)	(126,444)	(242,907)
Net interest and dividend revenue	535,735	588,488	676,241
Provision for credit losses	31,128	69,475	39,011
Net interest and dividend revenue after provision for credit losses	504,607	519,013	637,230
Other operating revenue	262,402	187,361	170,412
Other operating expense	281,089	258,903	252,459
Net direct contribution	485,920	447,471	555,183
Gain (loss) on financial instruments, net	154	193	106
Change in fair value of mortgage servicing rights	0	0	0
Gain (loss) on repossessed assets, net	13,001	(2,677)	331
Corporate expense allocations	49,941	24,862	43,055
Net income before taxes	449,134	420,125	512,565
Federal and state income taxes	120,618	114,120	137,759
Net income	328,516	306,005	374,806
Net income (loss) attributable to Non-controlling interests	0	0	0
Net income attributable to BOK Financial Corp. shareholders	328,516	306,005	374,806
Average assets	28,536,881	26,994,075	22,807,589
Operating Segments [Member] | Consumer [Member]
Segment Reporting Information [Line Items]
Net interest and dividend revenue from external sources	67,856	78,004	99,679
Net interest revenue (expense) from internal sources	35,671	69,000	95,775
Net interest and dividend revenue	103,527	147,004	195,454
Provision for credit losses	4,009	2,805	6,271
Net interest and dividend revenue after provision for credit losses	99,518	144,199	189,183
Other operating revenue	173,341	243,719	187,500
Other operating expense	209,596	230,402	226,346
Net direct contribution	63,263	157,516	150,337
Gain (loss) on financial instruments, net	(21,871)	95,344	30,375
Change in fair value of mortgage servicing rights	41,637	(79,524)	(53,517)
Gain (loss) on repossessed assets, net	85	276	496
Corporate expense allocations	46,010	42,155	46,926
Net income before taxes	37,104	131,457	80,765
Federal and state income taxes	9,461	33,483	20,572
Net income	27,643	97,974	60,193
Net income (loss) attributable to Non-controlling interests	0	0	0
Net income attributable to BOK Financial Corp. shareholders	27,643	97,974	60,193
Average assets	10,029,687	9,842,114	9,301,341
Operating Segments [Member] | Wealth Management [Member]
Segment Reporting Information [Line Items]
Net interest and dividend revenue from external sources	214,458	130,818	61,277
Net interest revenue (expense) from internal sources	(386)	(13,528)	38,815
Net interest and dividend revenue	214,072	117,290	100,092
Provision for credit losses	(223)	(209)	(308)
Net interest and dividend revenue after provision for credit losses	214,295	117,499	100,400
Other operating revenue	298,962	398,834	341,389
Other operating expense	320,357	325,627	277,267
Net direct contribution	192,900	190,706	164,522
Gain (loss) on financial instruments, net	0	4	2
Change in fair value of mortgage servicing rights	0	0	0
Gain (loss) on repossessed assets, net	0	0	0
Corporate expense allocations	40,301	35,331	36,239
Net income before taxes	152,599	155,379	128,285
Federal and state income taxes	39,049	39,765	32,954
Net income	113,550	115,614	95,331
Net income (loss) attributable to Non-controlling interests	0	0	0
Net income attributable to BOK Financial Corp. shareholders	113,550	115,614	95,331
Average assets	19,425,475	15,695,646	10,204,426
Funds Management and Other [Member]
Segment Reporting Information [Line Items]
Net interest and dividend revenue from external sources	228,817	184,690	32,775
Net interest revenue (expense) from internal sources	35,882	70,972	108,317
Net interest and dividend revenue	264,699	255,662	141,092
Provision for credit losses	(134,914)	150,521	(974)
Net interest and dividend revenue after provision for credit losses	399,613	105,141	142,066
Other operating revenue	21,070	12,406	(4,068)
Other operating expense	366,666	349,376	377,172
Net direct contribution	54,017	(231,829)	(239,174)
Gain (loss) on financial instruments, net	21,717	(95,541)	(30,483)
Change in fair value of mortgage servicing rights	(41,637)	79,524	53,517
Gain (loss) on repossessed assets, net	(13,086)	2,401	(827)
Corporate expense allocations	(136,252)	(102,348)	(126,220)
Net income before taxes	157,263	(143,097)	(90,747)
Federal and state income taxes	10,647	(58,575)	(61,102)
Net income	146,616	(84,522)	(29,645)
Net income (loss) attributable to Non-controlling interests	(1,796)	41	(73)
Net income attributable to BOK Financial Corp. shareholders	148,412	(84,563)	(29,572)
Average assets	$ (7,840,340)	$ (3,827,445)	$ (219,009)

Fees and Commission Revenue F_2

Fees and Commission Revenue Fees and Commissions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021		Dec. 31, 2020		Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	$ 668,309		$ 810,320		$ 702,201
Fees and commissions revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	668,309		810,320		702,201
Fees and commissions revenue not from contracts with customers	224,544	[1]	397,030	[2]	263,146	[3]
Fees and commissions revenue from contracts with customers	443,765	[4]	413,290	[5]	439,055	[6]
Brokerage and trading revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	112,989		221,833		159,826
Fees and commissions revenue not from contracts with customers	64,299	[1]	175,578	[2]	116,177	[3]
Fees and commissions revenue from contracts with customers	48,690	[4]	46,255	[5]	43,649	[6]
Trading Revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	27,595		144,299		88,558
Fees and commissions revenue not from contracts with customers	27,595	[1]	144,299	[2]	88,558	[3]
Fees and commissions revenue from contracts with customers	0	[4]	0	[5]	0	[6]
Customer hedging revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	20,432		22,749		18,941
Fees and commissions revenue not from contracts with customers	20,432	[1]	22,749	[2]	18,941	[3]
Fees and commissions revenue from contracts with customers	0	[4]	0	[5]	0	[6]
Retail brokerage revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	18,762		15,690		16,136
Fees and commissions revenue not from contracts with customers	0	[1]	0	[2]	0	[3]
Fees and commissions revenue from contracts with customers	18,762	[4]	15,690	[5]	16,136	[6]
Insurance brokerage revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	11,765		12,702		13,861
Fees and commissions revenue not from contracts with customers	0	[1]	0	[2]	0	[3]
Fees and commissions revenue from contracts with customers	11,765	[4]	12,702	[5]	13,861	[6]
Investment banking revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	34,435		26,393		22,330
Fees and commissions revenue not from contracts with customers	16,272	[1]	8,530	[2]	8,678	[3]
Fees and commissions revenue from contracts with customers	18,163	[4]	17,863	[5]	13,652	[6]
Transaction card revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	96,983		90,182		87,216
Fees and commissions revenue not from contracts with customers	0	[1]	0	[2]	0	[3]
Fees and commissions revenue from contracts with customers	96,983	[4]	90,182	[5]	87,216	[6]
TransFund EFT network revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	80,133		78,370		77,324
Fees and commissions revenue not from contracts with customers	0	[1]	0	[2]	0	[3]
Fees and commissions revenue from contracts with customers	80,133	[4]	78,370	[5]	77,324	[6]
Merchant services revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	11,861		9,232		8,786
Fees and commissions revenue not from contracts with customers	0	[1]	0	[2]	0	[3]
Fees and commissions revenue from contracts with customers	11,861	[4]	9,232	[5]	8,786	[6]
Corporate card revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	4,989		2,580		1,106
Fees and commissions revenue not from contracts with customers	0	[1]	0	[2]	0	[3]
Fees and commissions revenue from contracts with customers	4,989	[4]	2,580	[5]	1,106	[6]
Fiduciary and asset management revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	178,274		167,445		177,025
Fees and commissions revenue not from contracts with customers	0	[1]	0	[2]	0	[3]
Fees and commissions revenue from contracts with customers	178,274	[4]	167,445	[5]	177,025	[6]
Personal trust revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	97,582		84,759		81,763
Fees and commissions revenue not from contracts with customers	0	[1]	0	[2]	0	[3]
Fees and commissions revenue from contracts with customers	97,582	[4]	84,759	[5]	81,763	[6]
Corporate trust revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	14,805		19,308		24,635
Fees and commissions revenue not from contracts with customers	0	[1]	0	[2]	0	[3]
Fees and commissions revenue from contracts with customers	14,805	[4]	19,308	[5]	24,635	[6]
Institutional trust & retirement plan services revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	50,765		46,253		45,084
Fees and commissions revenue not from contracts with customers	0	[1]	0	[2]	0	[3]
Fees and commissions revenue from contracts with customers	50,765	[4]	46,253	[5]	45,084	[6]
Investment management services and other [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	15,122		17,125		25,543
Fees and commissions revenue not from contracts with customers	0	[1]	0	[2]	0	[3]
Fees and commissions revenue from contracts with customers	15,122	[4]	17,125	[5]	25,543	[6]
Deposit service charges and fees [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	104,217		96,805		112,485
Fees and commissions revenue not from contracts with customers	0	[1]	0	[2]	0	[3]
Fees and commissions revenue from contracts with customers	104,217	[4]	96,805	[5]	112,485	[6]
Commercial account service charge revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	54,360		48,421		47,905
Fees and commissions revenue not from contracts with customers	0	[1]	0	[2]	0	[3]
Fees and commissions revenue from contracts with customers	54,360	[4]	48,421	[5]	47,905	[6]
Overdraft fee revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	21,622		21,892		35,356
Fees and commissions revenue not from contracts with customers	0	[1]	0	[2]	0	[3]
Fees and commissions revenue from contracts with customers	21,622	[4]	21,892	[5]	35,356	[6]
Check card fee revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	23,714		21,355		22,030
Fees and commissions revenue not from contracts with customers	0	[1]	0	[2]	0	[3]
Fees and commissions revenue from contracts with customers	23,714	[4]	21,355	[5]	22,030	[6]
Automated service charge and other deposit fee revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	4,521		5,137		7,194
Fees and commissions revenue not from contracts with customers	0	[1]	0	[2]	0	[3]
Fees and commissions revenue from contracts with customers	4,521	[4]	5,137	[5]	7,194	[6]
Mortgage banking revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	105,896		182,360		107,541
Fees and commissions revenue not from contracts with customers	105,896	[1]	182,360	[2]	107,541	[3]
Fees and commissions revenue from contracts with customers	0	[4]	0	[5]	0	[6]
Mortgage production revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	60,712		125,848		42,720
Fees and commissions revenue not from contracts with customers	60,712	[1]	125,848	[2]	42,720	[3]
Fees and commissions revenue from contracts with customers	0	[4]	0	[5]	0	[6]
Mortgage servicing revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	45,184		56,512		64,821
Fees and commissions revenue not from contracts with customers	45,184	[1]	56,512	[2]	64,821	[3]
Fees and commissions revenue from contracts with customers	0	[4]	0	[5]	0	[6]
Other revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	69,950		51,695		58,108
Fees and commissions revenue not from contracts with customers	54,349	[1]	39,092	[2]	39,428	[3]
Fees and commissions revenue from contracts with customers	15,601	[4]	12,603	[5]	18,680	[6]
Operating Segments [Member] | Commercial [Member] | Fees and commissions revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	227,081		187,119		168,667
Operating Segments [Member] | Commercial [Member] | Brokerage and trading revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	42,553		31,950		18,558
Operating Segments [Member] | Commercial [Member] | Trading Revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	0		0		0
Operating Segments [Member] | Commercial [Member] | Customer hedging revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	23,424		22,767		8,422
Operating Segments [Member] | Commercial [Member] | Retail brokerage revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	0		0		0
Operating Segments [Member] | Commercial [Member] | Insurance brokerage revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	0		0		0
Operating Segments [Member] | Commercial [Member] | Investment banking revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	19,129		9,183		10,136
Operating Segments [Member] | Commercial [Member] | Transaction card revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	92,911		86,897		83,158
Operating Segments [Member] | Commercial [Member] | TransFund EFT network revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	76,603		75,363		73,479
Operating Segments [Member] | Commercial [Member] | Merchant services revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	11,806		9,172		8,607
Operating Segments [Member] | Commercial [Member] | Corporate card revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	4,502		2,362		1,072
Operating Segments [Member] | Commercial [Member] | Fiduciary and asset management revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	0		0		0
Operating Segments [Member] | Commercial [Member] | Personal trust revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	0		0		0
Operating Segments [Member] | Commercial [Member] | Corporate trust revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	0		0		0
Operating Segments [Member] | Commercial [Member] | Institutional trust & retirement plan services revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	0		0		0
Operating Segments [Member] | Commercial [Member] | Investment management services and other [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	0		0		0
Operating Segments [Member] | Commercial [Member] | Deposit service charges and fees [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	50,411		44,932		43,387
Operating Segments [Member] | Commercial [Member] | Commercial account service charge revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	50,213		44,489		42,251
Operating Segments [Member] | Commercial [Member] | Overdraft fee revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	104		132		313
Operating Segments [Member] | Commercial [Member] | Check card fee revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	0		0		0
Operating Segments [Member] | Commercial [Member] | Automated service charge and other deposit fee revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	94		311		823
Operating Segments [Member] | Commercial [Member] | Mortgage banking revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	0		0		0
Operating Segments [Member] | Commercial [Member] | Mortgage production revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	0		0		0
Operating Segments [Member] | Commercial [Member] | Mortgage servicing revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	0		0		0
Operating Segments [Member] | Commercial [Member] | Other revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	41,206		23,340		23,564
Operating Segments [Member] | Consumer [Member] | Fees and commissions revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	173,364		245,554		187,996
Operating Segments [Member] | Consumer [Member] | Brokerage and trading revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	0		0		0
Operating Segments [Member] | Consumer [Member] | Trading Revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	0		0		0
Operating Segments [Member] | Consumer [Member] | Customer hedging revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	0		0		0
Operating Segments [Member] | Consumer [Member] | Retail brokerage revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	0		0		0
Operating Segments [Member] | Consumer [Member] | Insurance brokerage revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	0		0		0
Operating Segments [Member] | Consumer [Member] | Investment banking revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	0		0		0
Operating Segments [Member] | Consumer [Member] | Transaction card revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	3,646		3,118		3,980
Operating Segments [Member] | Consumer [Member] | TransFund EFT network revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	3,591		3,058		3,924
Operating Segments [Member] | Consumer [Member] | Merchant services revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	55		60		56
Operating Segments [Member] | Consumer [Member] | Corporate card revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	0		0		0
Operating Segments [Member] | Consumer [Member] | Fiduciary and asset management revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	0		0		0
Operating Segments [Member] | Consumer [Member] | Personal trust revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	0		0		0
Operating Segments [Member] | Consumer [Member] | Corporate trust revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	0		0		0
Operating Segments [Member] | Consumer [Member] | Institutional trust & retirement plan services revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	0		0		0
Operating Segments [Member] | Consumer [Member] | Investment management services and other [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	0		0		0
Operating Segments [Member] | Consumer [Member] | Deposit service charges and fees [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	51,314		49,437		64,867
Operating Segments [Member] | Consumer [Member] | Commercial account service charge revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	1,821		1,654		1,713
Operating Segments [Member] | Consumer [Member] | Overdraft fee revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	21,439		21,679		35,134
Operating Segments [Member] | Consumer [Member] | Check card fee revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	23,714		21,355		21,865
Operating Segments [Member] | Consumer [Member] | Automated service charge and other deposit fee revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	4,340		4,749		6,155
Operating Segments [Member] | Consumer [Member] | Mortgage banking revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	107,767		184,097		109,416
Operating Segments [Member] | Consumer [Member] | Mortgage production revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	60,712		125,848		42,724
Operating Segments [Member] | Consumer [Member] | Mortgage servicing revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	47,055		58,249		66,692
Operating Segments [Member] | Consumer [Member] | Other revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	10,637		8,902		9,733
Operating Segments [Member] | Wealth Management [Member] | Fees and commissions revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	298,765		399,229		341,333
Operating Segments [Member] | Wealth Management [Member] | Brokerage and trading revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	75,164		190,477		136,801
Operating Segments [Member] | Wealth Management [Member] | Trading Revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	27,595		144,299		88,558
Operating Segments [Member] | Wealth Management [Member] | Customer hedging revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	300		395		9,667
Operating Segments [Member] | Wealth Management [Member] | Retail brokerage revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	18,762		15,690		16,251
Operating Segments [Member] | Wealth Management [Member] | Insurance brokerage revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	11,765		12,702		10,131
Operating Segments [Member] | Wealth Management [Member] | Investment banking revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	16,742		17,391		12,194
Operating Segments [Member] | Wealth Management [Member] | Transaction card revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	102		19		(50)
Operating Segments [Member] | Wealth Management [Member] | TransFund EFT network revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	(67)		(56)		(82)
Operating Segments [Member] | Wealth Management [Member] | Merchant services revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	0		0		0
Operating Segments [Member] | Wealth Management [Member] | Corporate card revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	169		75		32
Operating Segments [Member] | Wealth Management [Member] | Fiduciary and asset management revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	178,452		167,610		175,475
Operating Segments [Member] | Wealth Management [Member] | Personal trust revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	97,582		84,759		81,763
Operating Segments [Member] | Wealth Management [Member] | Corporate trust revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	14,805		19,308		24,635
Operating Segments [Member] | Wealth Management [Member] | Institutional trust & retirement plan services revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	50,765		46,253		45,084
Operating Segments [Member] | Wealth Management [Member] | Investment management services and other [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	15,300		17,290		23,993
Operating Segments [Member] | Wealth Management [Member] | Deposit service charges and fees [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	2,483		2,430		2,443
Operating Segments [Member] | Wealth Management [Member] | Commercial account service charge revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	2,326		2,282		2,137
Operating Segments [Member] | Wealth Management [Member] | Overdraft fee revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	70		74		138
Operating Segments [Member] | Wealth Management [Member] | Check card fee revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	0		0		0
Operating Segments [Member] | Wealth Management [Member] | Automated service charge and other deposit fee revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	87		74		168
Operating Segments [Member] | Wealth Management [Member] | Mortgage banking revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	0		0		0
Operating Segments [Member] | Wealth Management [Member] | Mortgage production revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	0		0		0
Operating Segments [Member] | Wealth Management [Member] | Mortgage servicing revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	0		0		0
Operating Segments [Member] | Wealth Management [Member] | Other revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	42,564		38,693		26,664
Funds Management and Other [Member] | Fees and commissions revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	(30,901)		(21,582)		4,205
Funds Management and Other [Member] | Brokerage and trading revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	(4,728)		(594)		4,467
Funds Management and Other [Member] | Trading Revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	0		0		0
Funds Management and Other [Member] | Customer hedging revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	(3,292)		(413)		852
Funds Management and Other [Member] | Retail brokerage revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	0		0		(115)
Funds Management and Other [Member] | Insurance brokerage revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	0		0		3,730
Funds Management and Other [Member] | Investment banking revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	(1,436)		(181)		0
Funds Management and Other [Member] | Transaction card revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	324		148		128
Funds Management and Other [Member] | TransFund EFT network revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	6		5		3
Funds Management and Other [Member] | Merchant services revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	0		0		123
Funds Management and Other [Member] | Corporate card revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	318		143		2
Funds Management and Other [Member] | Fiduciary and asset management revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	(178)		(165)		1,550
Funds Management and Other [Member] | Personal trust revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	0		0		0
Funds Management and Other [Member] | Corporate trust revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	0		0		0
Funds Management and Other [Member] | Institutional trust & retirement plan services revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	0		0		0
Funds Management and Other [Member] | Investment management services and other [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	(178)		(165)		1,550
Funds Management and Other [Member] | Deposit service charges and fees [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	9		6		1,788
Funds Management and Other [Member] | Commercial account service charge revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	0		(4)		1,804
Funds Management and Other [Member] | Overdraft fee revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	9		7		(229)
Funds Management and Other [Member] | Check card fee revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	0		0		165
Funds Management and Other [Member] | Automated service charge and other deposit fee revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	0		3		48
Funds Management and Other [Member] | Mortgage banking revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	(1,871)		(1,737)		(1,875)
Funds Management and Other [Member] | Mortgage production revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	0		0		(4)
Funds Management and Other [Member] | Mortgage servicing revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	(1,871)		(1,737)		(1,871)
Funds Management and Other [Member] | Other revenue [Member]
Disaggregation of Revenue [Line Items]
Fess and commissions revenue	$ (24,457)		$ (19,240)		$ (1,853)
[1]	Out of scope revenue generally relates to financial instruments or contractual rights and obligations within the scope of other applicable accounting guidance.
[2]	Out of scope revenue generally relates to financial instruments or contractual rights and obligations within the scope of other applicable accounting guidance.
[3]	Out of scope revenue generally relates to financial instruments or contractual rights and obligations within the scope of other applicable accounting guidance.
[4]	In scope revenue represents revenue subject to FASB ASC Topic 606, Revenue from Contracts with Customers.
[5]	In scope revenue represents revenue subject to FASB ASC Topic 606, Revenue from Contracts with Customers.
[6]	In scope revenue represents revenue subject to FASB ASC Topic 606, Revenue from Contracts with Customers.

Fair Value Measurements, Fair V

Fair Value Measurements, Fair Value Of Financial Instruments as Measured On a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2021		Dec. 31, 2020		Dec. 31, 2019	Dec. 31, 2018
Assets [Abstract]
Trading securities	$ 9,136,813		$ 4,707,975
Available for sale securities	13,157,817		13,050,665
Fair value option securities	43,770		114,982
Mortgage servicing rights	163,198		101,172		$ 201,886	$ 259,254
Derivative contracts, net of cash margin, Assets, Fair Value	1,097,297		810,688
Liabilities [Abstract]
Derivative contracts, net of cash margin, Liabilities, Fair Value	275,625		405,779
U.S. government securities [Member]
Assets [Abstract]
Trading securities	23,610		9,183
Residential agency mortgage-backed securities [Member]
Assets [Abstract]
Trading securities	9,068,900		4,669,148
Available for sale securities	8,006,616		9,340,471
Fair value option securities	43,770		114,982
Municipal securities [Member]
Assets [Abstract]
Trading securities	25,783		19,172
Available for sale securities	508,365		167,979
U.S. Treasury [Member]
Assets [Abstract]
Available for sale securities	1,000		508
Residential non-agency mortgage-backed securities [Member]
Assets [Abstract]
Available for sale securities	24,339		32,770
Commercial agency mortgage-backed securities [Member]
Assets [Abstract]
Available for sale securities	4,617,025		3,508,465
Other debt securities [Member]
Assets [Abstract]
Trading securities	18,520		10,472
Available for sale securities	472		472
Fair Value, Recurring [Member]
Assets [Abstract]
Trading securities	9,136,813		4,707,975
Available for sale securities	13,157,817		13,050,665
Residential mortgage loans held for sale	192,295	[1]	252,316	[2]
Mortgage servicing rights	163,198	[3]	101,172	[4]
Derivative contracts, net of cash margin, Assets, Fair Value	1,097,297	[5]	810,688	[6]
Liabilities [Abstract]
Derivative contracts, net of cash margin, Liabilities, Fair Value	275,625	[5]	405,779	[6]
Fair Value, Recurring [Member] | U.S. government securities [Member]
Assets [Abstract]
Trading securities	23,610		9,183
Fair Value, Recurring [Member] | Residential agency mortgage-backed securities [Member]
Assets [Abstract]
Trading securities	9,068,900		4,669,148
Available for sale securities	8,006,616		9,340,471
Fair value option securities	43,770		114,982
Fair Value, Recurring [Member] | Municipal securities [Member]
Assets [Abstract]
Trading securities	25,783		19,172
Available for sale securities	508,365		167,979
Fair Value, Recurring [Member] | U.S. Treasury [Member]
Assets [Abstract]
Available for sale securities	1,000		508
Fair Value, Recurring [Member] | Residential non-agency mortgage-backed securities [Member]
Assets [Abstract]
Available for sale securities	24,339		32,770
Fair Value, Recurring [Member] | Commercial agency mortgage-backed securities [Member]
Assets [Abstract]
Available for sale securities	4,617,025		3,508,465
Fair Value, Recurring [Member] | Other debt securities [Member]
Assets [Abstract]
Available for sale securities	472		472
Fair Value, Recurring [Member] | Other trading securities [Member]
Assets [Abstract]
Trading securities	18,520		10,472
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Assets [Abstract]
Trading securities	4,999		4,999
Available for sale securities	1,000		508
Residential mortgage loans held for sale	0	[1]	0	[2]
Mortgage servicing rights	0	[3]	0	[4]
Derivative contracts, net of cash margin, Assets, Fair Value	8,331	[5]	10,780	[6]
Liabilities [Abstract]
Derivative contracts, net of cash margin, Liabilities, Fair Value	0	[5]	0	[6]
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. government securities [Member]
Assets [Abstract]
Trading securities	4,999		4,999
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Residential agency mortgage-backed securities [Member]
Assets [Abstract]
Trading securities	0		0
Available for sale securities	0		0
Fair value option securities	0		0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Municipal securities [Member]
Assets [Abstract]
Trading securities	0		0
Available for sale securities	0		0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. Treasury [Member]
Assets [Abstract]
Available for sale securities	1,000		508
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Residential non-agency mortgage-backed securities [Member]
Assets [Abstract]
Available for sale securities	0		0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Commercial agency mortgage-backed securities [Member]
Assets [Abstract]
Available for sale securities	0		0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other debt securities [Member]
Assets [Abstract]
Available for sale securities	0		0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other trading securities [Member]
Assets [Abstract]
Trading securities	0		0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Assets [Abstract]
Trading securities	9,131,814		4,702,976
Available for sale securities	13,156,345		13,049,685
Residential mortgage loans held for sale	185,969	[1]	245,299	[2]
Mortgage servicing rights	0	[3]	0	[4]
Derivative contracts, net of cash margin, Assets, Fair Value	1,088,966	[5]	799,908	[6]
Liabilities [Abstract]
Derivative contracts, net of cash margin, Liabilities, Fair Value	275,625	[5]	405,779	[6]
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. government securities [Member]
Assets [Abstract]
Trading securities	18,611		4,184
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Residential agency mortgage-backed securities [Member]
Assets [Abstract]
Trading securities	9,068,900		4,669,148
Available for sale securities	8,006,616		9,340,471
Fair value option securities	43,770		114,982
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Municipal securities [Member]
Assets [Abstract]
Trading securities	25,783		19,172
Available for sale securities	508,365		167,979
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. Treasury [Member]
Assets [Abstract]
Available for sale securities	0		0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Residential non-agency mortgage-backed securities [Member]
Assets [Abstract]
Available for sale securities	24,339		32,770
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Commercial agency mortgage-backed securities [Member]
Assets [Abstract]
Available for sale securities	4,617,025		3,508,465
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other debt securities [Member]
Assets [Abstract]
Available for sale securities	0		0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other trading securities [Member]
Assets [Abstract]
Trading securities	18,520		10,472
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Assets [Abstract]
Trading securities	0		0
Available for sale securities	472		472
Residential mortgage loans held for sale	6,326	[1]	7,017	[2]
Mortgage servicing rights	163,198	[3]	101,172	[4]
Derivative contracts, net of cash margin, Assets, Fair Value	$ 0	[5]	$ 0	[6]
Liquidity Discount on Mortgage Loans Qualifying for Sale to US Govt Agencies	95.07%		94.57%
Liabilities [Abstract]
Derivative contracts, net of cash margin, Liabilities, Fair Value	$ 0	[5]	$ 0	[6]
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | U.S. government securities [Member]
Assets [Abstract]
Trading securities	0		0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Residential agency mortgage-backed securities [Member]
Assets [Abstract]
Trading securities	0		0
Available for sale securities	0		0
Fair value option securities	0		0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Municipal securities [Member]
Assets [Abstract]
Trading securities	0		0
Available for sale securities	0		0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | U.S. Treasury [Member]
Assets [Abstract]
Available for sale securities	0		0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Residential non-agency mortgage-backed securities [Member]
Assets [Abstract]
Available for sale securities	0		0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Commercial agency mortgage-backed securities [Member]
Assets [Abstract]
Available for sale securities	0		0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other debt securities [Member]
Assets [Abstract]
Available for sale securities	472		472
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other trading securities [Member]
Assets [Abstract]
Trading securities	$ 0		$ 0
[1]	Residential mortgage loans held for sale measured at fair value on a recurring basis using significant unobservable inputs (Level 3) consist of residential mortgage loans intended for sale to U.S. government agencies that fail to meet conforming standards and are valued at 95.07% of the unpaid principal balance.
[2]	Residential mortgage loans held for sale measured at fair value on a recurring basis using significant unobservable inputs (Level 3) consist of residential mortgage loans intended for sale to U.S. government agencies that fail to meet conforming standards and are valued at 94.57% of the unpaid principal balance.
[3]	A reconciliation of the beginning and ending fair value of mortgage servicing rights and disclosures of significant assumptions used to determine fair value are presented in Note 7, Mortgage Banking Activities.
[4]	A reconciliation of the beginning and ending fair value of mortgage servicing rights and disclosures of significant assumptions used to determine fair value are presented in Note 7, Mortgage Banking Activities.
[5]	See Note 3 for detail of fair value of derivative contracts by contract type. Derivative contracts in asset positions that were valued based on quoted prices in active markets for identical instruments (Level 1) are primarily exchange-traded interest rate derivative contracts. Derivative contracts in liability positions that were valued using quoted prices in active markets for identical instruments are exchange-traded energy derivative contracts, fully offset by cash margin.
[6]	See Note 3 for detail of fair value of derivative contracts by contract type. Derivative contracts based on quoted prices in active markets for identical instruments (Level 1) are exchange-traded interest rate derivative contracts, net of cash margin. Derivative contracts in liability positions that were valued using quoted prices in active markets for identical instruments (Level 1) are exchange-traded interest rate, energy and agricultural contracts, fully offset by cash margin.

Fair Value Measurements, Fair_2

Fair Value Measurements, Fair Value Measured On a Nonrecurring Basis (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other gains (losses), net	$ 63,742	$ 6,046	$ 10,214
Fair Value, Nonrecurring [Member] | Fair Value, Nonaccruing Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross charge-offs against allowance for loan losses	2,087	39,299
Other gains (losses), net	0	0
Fair Value, Nonrecurring [Member] | Real estate and other repossessed assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross charge-offs against allowance for loan losses	0	0
Other gains (losses), net	(150)	4,602
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonaccruing Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	0	0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] | Real estate and other repossessed assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	0	0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonaccruing Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	808	801
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Real estate and other repossessed assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	1,706	18,188
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonaccruing Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	1,990	20,423
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Real estate and other repossessed assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	$ 0	$ 2,842

Fair Value Measurements Fair Va

Fair Value Measurements Fair Value Measurement, Measured On Non-Recurring Basis, Signfiicant Unobservable Inputs, Quantitative Information (Details) - Fair Value, Nonrecurring [Member] - USD ($) $ in Thousands	Dec. 31, 2021		Dec. 31, 2020
Fair Value, Inputs, Level 2 [Member] | Pension Plan [Member] | BOK Financial Pension Plan [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 39,000		$ 38,000
Fair Value, Nonaccruing Loans | Fair Value, Inputs, Level 3 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure	1,990		20,423
Fair Value, Nonaccruing Loans | Fair Value, Inputs, Level 2 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure	808		801
Real estate and other repossessed assets [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure	0		2,842
Real estate and other repossessed assets [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure	1,706		18,188
Discounted Cash Flow [Member] | Fair Value, Nonaccruing Loans | Fair Value, Inputs, Level 3 [Member] | Management knowledge of Industry [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure	$ 1,990		20,423
Discounted Cash Flow [Member] | Real estate and other repossessed assets [Member] | Fair Value, Inputs, Level 3 [Member] | Management knowledge of Industry [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure			$ 2,842
Minimum [Member] | Fair Value, Nonaccruing Loans | Fair Value, Inputs, Level 3 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value of Impaired Loans as Percentage of Unpaid Principal Balance	16.00%	[1]	1.00%	[2]
Maximum [Member] | Fair Value, Nonaccruing Loans | Fair Value, Inputs, Level 3 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value of Impaired Loans as Percentage of Unpaid Principal Balance	97.00%	[1]	91.00%	[2]
Weighted Average [Member] | Fair Value, Nonaccruing Loans | Fair Value, Inputs, Level 3 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value of Impaired Loans as Percentage of Unpaid Principal Balance	37.00%	[1]	23.00%	[2]
[1]	Represents fair value as a percentage of the unpaid principal balance.
[2]	Represents fair value as a percentage of the unpaid principal balance.

Fair Value Measurements, Financ

Fair Value Measurements, Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	$ 9,136,813	$ 4,707,975
Debt Securities, Held-to-maturity, gross	210,999	245,531
Debt Securities, Held-to-maturity, Allowance for Credit Loss	(555)	(688)
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss	210,444	244,843
Investment securities, fair value	231,395	272,431
Investment securities	210,444	244,843
Available for sale securities	13,157,817	13,050,665
Fair value option securities	43,770	114,982
Residential mortgage loans held for sale	192,295	252,316
Loans and Leases Receivable, Gross	20,205,680	23,007,520
Allowance for loan losses	(256,421)	(388,640)	$ (210,759)	$ (207,457)
Loans, net of allowance	19,949,259	22,618,880
Mortgage servicing rights	163,198	101,172	201,886	259,254
Derivative contracts, net of cash margin, Assets, Fair Value	1,097,297	810,688
Time deposits	1,704,328	1,967,128
Subordinated debentures	131,226	276,005
Derivative contracts, net of cash margin, Liabilities, Fair Value	275,625	405,779
Commercial [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and Leases Receivable, Gross	12,506,465	13,077,535
Allowance for loan losses			(118,187)	(102,226)
Commercial real estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and Leases Receivable, Gross	3,831,325	4,698,538
Allowance for loan losses			$ (51,805)	$ (60,026)
Paycheck Protection Program
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and Leases Receivable, Gross	276,341	1,682,310
Loans to individuals [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and Leases Receivable, Gross	3,591,549	3,549,137
U.S. government securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	23,610	9,183
Residential agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	9,068,900	4,669,148
Debt Securities, Held-to-maturity, gross	6,939	8,913
Investment securities, fair value	7,500	9,790
Available for sale securities	8,006,616	9,340,471
Fair value option securities	43,770	114,982
Municipal securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	25,783	19,172
Debt Securities, Held-to-maturity, gross	203,772	229,245
Investment securities, fair value	223,609	255,270
Available for sale securities	508,365	167,979
U.S. Treasury [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	1,000	508
Residential non-agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	24,339	32,770
Commercial agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	4,617,025	3,508,465
Other debt securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	18,520	10,472
Debt Securities, Held-to-maturity, gross	288	7,373
Investment securities, fair value	286	7,371
Available for sale securities	472	472
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	712,067	798,757
Interest-bearing cash and cash equivalents	2,125,343	381,816
Trading securities	9,136,813	4,707,975
Debt Securities, Held-to-maturity, gross	210,999	245,531
Debt Securities, Held-to-maturity, Allowance for Credit Loss	(555)	(688)
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss	210,444
Investment securities		244,843
Available for sale securities	13,157,817	13,050,665
Fair value option securities	43,770	114,982
Residential mortgage loans held for sale	192,295	252,316
Loans and Leases Receivable, Gross	20,205,680	23,007,520
Allowance for loan losses	(256,421)	(388,640)
Loans, net of allowance	19,949,259	22,618,880
Mortgage servicing rights	163,198	101,172
Derivative contracts, net of cash margin, Assets, Fair Value	1,097,297	810,688
Deposits with no stated maturity	39,537,731	34,176,752
Time deposits	1,704,328	1,967,128
Other borrowed funds	2,363,202	3,545,356
Subordinated debentures	131,226	276,005
Derivative contracts, net of cash margin, Liabilities, Fair Value	275,625	405,779
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Commercial [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and Leases Receivable, Gross	12,506,465	13,077,535
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Commercial real estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and Leases Receivable, Gross	3,831,325	4,698,538
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Paycheck Protection Program
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and Leases Receivable, Gross	276,341	1,682,310
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Loans to individuals [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and Leases Receivable, Gross	3,591,549	3,549,137
Carrying (Reported) Amount, Fair Value Disclosure [Member] | U.S. government securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	23,610	9,183
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Residential agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	9,068,900	4,669,148
Debt Securities, Held-to-maturity, gross	6,939	8,913
Available for sale securities	8,006,616	9,340,471
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Municipal securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	25,783	19,172
Debt Securities, Held-to-maturity, gross	203,772	229,245
Available for sale securities	508,365	167,979
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Other trading securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	18,520	10,472
Carrying (Reported) Amount, Fair Value Disclosure [Member] | U.S. Treasury [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	1,000	508
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Residential non-agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	24,339	32,770
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Commercial agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	4,617,025	3,508,465
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Other debt securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Held-to-maturity, gross	288	7,373
Available for sale securities	472	472
Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	712,067	798,757
Interest-bearing cash and cash equivalents	2,125,343	381,816
Trading securities	9,136,813	4,707,975
Debt Securities, Held-to-maturity, gross	231,395	272,431
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0	0
Investment securities, fair value	231,395
Investment securities		272,431
Available for sale securities	13,157,817	13,050,665
Fair value option securities	43,770	114,982
Residential mortgage loans held for sale	192,295	252,316
Loans and Leases Receivable, Gross	20,039,221	22,885,806
Allowance for loan losses	0	0
Loans, net of allowance	20,039,221	22,885,806
Mortgage servicing rights	163,198	101,172
Derivative contracts, net of cash margin, Assets, Fair Value	1,097,297	810,688
Deposits with no stated maturity	39,537,731	34,176,752
Time deposits	1,703,886	1,976,936
Other borrowed funds	2,360,746	3,542,489
Subordinated debentures	141,761	269,544
Derivative contracts, net of cash margin, Liabilities, Fair Value	275,625	405,779
Estimate of Fair Value Measurement [Member] | Commercial [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and Leases Receivable, Gross	12,395,664	13,003,383
Estimate of Fair Value Measurement [Member] | Commercial real estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and Leases Receivable, Gross	3,786,767	4,649,763
Estimate of Fair Value Measurement [Member] | Paycheck Protection Program
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and Leases Receivable, Gross	269,912	1,669,461
Estimate of Fair Value Measurement [Member] | Loans to individuals [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and Leases Receivable, Gross	3,586,878	3,563,199
Estimate of Fair Value Measurement [Member] | U.S. government securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	23,610	9,183
Estimate of Fair Value Measurement [Member] | Residential agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	9,068,900	4,669,148
Debt Securities, Held-to-maturity, gross	7,500	9,790
Available for sale securities	8,006,616	9,340,471
Estimate of Fair Value Measurement [Member] | Municipal securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	25,783	19,172
Debt Securities, Held-to-maturity, gross	223,609	255,270
Available for sale securities	508,365	167,979
Estimate of Fair Value Measurement [Member] | Other trading securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	18,520	10,472
Estimate of Fair Value Measurement [Member] | U.S. Treasury [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	1,000	508
Estimate of Fair Value Measurement [Member] | Residential non-agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	24,339	32,770
Estimate of Fair Value Measurement [Member] | Commercial agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	4,617,025	3,508,465
Estimate of Fair Value Measurement [Member] | Other debt securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Held-to-maturity, gross	286	7,371
Available for sale securities	472	472
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	712,067	798,757
Interest-bearing cash and cash equivalents	2,125,343	381,816
Trading securities	4,999	4,999
Debt Securities, Held-to-maturity, gross	0	0
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0	0
Investment securities, fair value	0
Investment securities		0
Available for sale securities	1,000	508
Fair value option securities	0	0
Residential mortgage loans held for sale	0	0
Loans and Leases Receivable, Gross	0	0
Allowance for loan losses	0	0
Loans, net of allowance	0	0
Mortgage servicing rights	0	0
Derivative contracts, net of cash margin, Assets, Fair Value	8,331	10,780
Deposits with no stated maturity	0	0
Time deposits	0	0
Other borrowed funds	0	0
Subordinated debentures	0	0
Derivative contracts, net of cash margin, Liabilities, Fair Value	0	0
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member] | Commercial [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and Leases Receivable, Gross	0	0
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member] | Commercial real estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and Leases Receivable, Gross	0	0
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member] | Paycheck Protection Program
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and Leases Receivable, Gross	0	0
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member] | Loans to individuals [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and Leases Receivable, Gross	0	0
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member] | U.S. government securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	4,999	4,999
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member] | Residential agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	0	0
Debt Securities, Held-to-maturity, gross	0	0
Available for sale securities	0	0
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member] | Municipal securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	0	0
Debt Securities, Held-to-maturity, gross	0	0
Available for sale securities	0	0
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member] | Other trading securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	0	0
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member] | U.S. Treasury [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	1,000	508
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member] | Residential non-agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	0	0
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member] | Commercial agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	0	0
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member] | Other debt securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Held-to-maturity, gross	0	0
Available for sale securities	0	0
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	0	0
Interest-bearing cash and cash equivalents	0	0
Trading securities	9,131,814	4,702,976
Debt Securities, Held-to-maturity, gross	65,484	86,565
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0	0
Investment securities, fair value	65,484
Investment securities		86,565
Available for sale securities	13,156,345	13,049,685
Fair value option securities	43,770	114,982
Residential mortgage loans held for sale	185,969	245,299
Loans and Leases Receivable, Gross	0	0
Allowance for loan losses	0	0
Loans, net of allowance	0	0
Mortgage servicing rights	0	0
Derivative contracts, net of cash margin, Assets, Fair Value	1,088,966	799,908
Deposits with no stated maturity	0	0
Time deposits	0	0
Other borrowed funds	0	0
Subordinated debentures	141,761	269,544
Derivative contracts, net of cash margin, Liabilities, Fair Value	275,625	405,779
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Commercial [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and Leases Receivable, Gross	0	0
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Commercial real estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and Leases Receivable, Gross	0	0
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Paycheck Protection Program
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and Leases Receivable, Gross	0	0
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Loans to individuals [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and Leases Receivable, Gross	0	0
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | U.S. government securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	18,611	4,184
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Residential agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	9,068,900	4,669,148
Debt Securities, Held-to-maturity, gross	7,500	9,790
Available for sale securities	8,006,616	9,340,471
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Municipal securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	25,783	19,172
Debt Securities, Held-to-maturity, gross	57,698	69,404
Available for sale securities	508,365	167,979
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Other trading securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	18,520	10,472
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | U.S. Treasury [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	0	0
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Residential non-agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	24,339	32,770
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Commercial agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	4,617,025	3,508,465
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Other debt securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Held-to-maturity, gross	286	7,371
Available for sale securities	0	0
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	0	0
Interest-bearing cash and cash equivalents	0	0
Trading securities	0	0
Debt Securities, Held-to-maturity, gross	165,911	185,866
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0	0
Investment securities, fair value	165,911
Investment securities		185,866
Available for sale securities	472	472
Fair value option securities	0	0
Residential mortgage loans held for sale	6,326	7,017
Loans and Leases Receivable, Gross	20,039,221	22,885,806
Allowance for loan losses	0	0
Loans, net of allowance	20,039,221	22,885,806
Mortgage servicing rights	163,198	101,172
Derivative contracts, net of cash margin, Assets, Fair Value	0	0
Deposits with no stated maturity	39,537,731	34,176,752
Time deposits	1,703,886	1,976,936
Other borrowed funds	2,360,746	3,542,489
Subordinated debentures	0	0
Derivative contracts, net of cash margin, Liabilities, Fair Value	0	0
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] | Commercial [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and Leases Receivable, Gross	12,395,664	13,003,383
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] | Commercial real estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and Leases Receivable, Gross	3,786,767	4,649,763
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] | Paycheck Protection Program
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and Leases Receivable, Gross	269,912	1,669,461
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] | Loans to individuals [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and Leases Receivable, Gross	3,586,878	3,563,199
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] | U.S. government securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	0	0
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] | Residential agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	0	0
Debt Securities, Held-to-maturity, gross	0	0
Available for sale securities	0	0
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] | Municipal securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	0	0
Debt Securities, Held-to-maturity, gross	165,911	185,866
Available for sale securities	0	0
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] | Other trading securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	0	0
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] | U.S. Treasury [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	0	0
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] | Residential non-agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	0	0
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] | Commercial agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	0	0
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] | Other debt securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Held-to-maturity, gross	0	0
Available for sale securities	$ 472	$ 472

Parent Company Only Financial_3

Parent Company Only Financial Statements Parent Company Only Financial Statements, Condensed Balance Sheet Statement (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Assets [Abstract]
Cash and cash equivalents	$ 2,837,410	$ 1,180,573	$ 1,258,821	$ 1,143,424
Loan to bank subsidiary	19,949,259	22,618,880
Other assets	957,951	907,218
Total assets	50,249,431	46,671,088
Liabilities [Abstract]
Other liabilities	435,221	427,213
Subordinated debentures	131,226	276,005
Total liabilities	44,881,060	41,379,527
Shareholders' equity: [Abstract]
Common stock	5	5
Capital surplus	1,378,794	1,368,062
Retained earnings	4,447,691	3,973,675
Treasury Stock, Value	(535,129)	(411,344)
Accumulated other comprehensive income (loss)	72,371	335,868	104,923	(72,585)
Total shareholders’ equity	5,363,732	5,266,266
Total liabilities and shareholders’ equity	50,249,431	46,671,088
Parent Company [Member]
Assets [Abstract]
Cash and cash equivalents	230,647	183,805	$ 214,779	$ 167,093
Loan to bank subsidiary	65,187	65,204
Investment in bank subsidiary	4,951,405	5,079,336
Investment in non-bank subsidiaries	228,447	195,768
Other assets	22,011	24,338
Total assets	5,497,697	5,548,451
Liabilities [Abstract]
Other liabilities	2,739	6,180
Subordinated debentures	131,226	276,005
Total liabilities	133,965	282,185
Shareholders' equity: [Abstract]
Common stock	5	5
Capital surplus	1,378,794	1,368,062
Retained earnings	4,447,691	3,973,675
Treasury Stock, Value	(535,129)	(411,344)
Accumulated other comprehensive income (loss)	72,371	335,868
Total shareholders’ equity	5,363,732	5,266,266
Total liabilities and shareholders’ equity	$ 5,497,697	$ 5,548,451

Parent Company Only Financial_4

Parent Company Only Financial Statements Parent Company Only Financial Statements, Condensed Income Statements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Condensed Income Statements, Captions [Line Items]
Interest expense	$ 61,896	$ 160,556	$ 419,079
Other operating expense	1,177,708	1,164,308	1,133,244
Other gains (losses), net	63,742	6,046	10,214
Federal and state income taxes	179,775	128,793	130,183
Net income attributable to BOK Financial Corp. shareholders	618,121	435,030	500,758
Parent Company [Member]
Condensed Income Statements, Captions [Line Items]
Total revenue	492,665	205,097	354,368
Interest expense	10,535	13,944	15,113
Other operating expense	2,914	2,697	2,352
Total expense	13,449	16,641	17,465
Net income before taxes, other losses, net, and equity in undistributed income of subsidiaries	479,216	188,456	336,903
Other gains (losses), net	(3,415)	1,465	3,310
Net income before taxes and equity in undistributed income of subsidiaries	475,801	189,921	340,213
Federal and state income taxes	(4,202)	(4,502)	(4,516)
Net income before equity in undistributed income of subsidiaries	480,003	194,423	344,729
Equity in undistributed income of bank subsidiaries	126,380	276,217	166,797
Equity in undistributed income of non-bank subsidiaries	11,738	(35,610)	(10,768)
Net income attributable to BOK Financial Corp. shareholders	618,121	435,030	500,758
Parent Company [Member] | Dividends, interest and fees received from bank susidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Total revenue	483,868	179,140	344,007
Parent Company [Member] | Dividends, interest and fees received from non-bank subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Total revenue	8,030	25,050	9,325
Parent Company [Member] | Other revenue [Member]
Condensed Income Statements, Captions [Line Items]
Total revenue	$ 767	$ 907	$ 1,036

Parent Company Only Financial_5

Parent Company Only Financial Statements Parent Company Only Financial Statements, Condensed Cash Flow Statement (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash Flows From Operating Activities: [Abstract]
Net income	$ 616,325	$ 435,071	$ 500,685
Adjustments to reconcile net income to net cash provided by operating activities: [Abstract]
Other gains, net	67,446	15,949	583
Change in other assets	(12,568)	1,739	18,955
Change in other liabilities	12,897	8,895	92,463
Net cash provided by operating activities	(3,692,577)	(416,256)	(473,679)
Cash Flows From Investing Activities: [Abstract]
Net cash used in investing activities	2,602,672	(2,458,835)	(2,323,737)
Cash Flows From Financing Activities: [Abstract]
Repayment of subordinated debentures	150,000	0	0
Issuance of common and treasury stock, net	(4,874)	(4,933)	(7)
Dividends paid	(144,105)	(144,437)	(143,496)
Repurchase of common stock	(117,938)	(75,830)	(129,483)
Net cash used in financing activities	2,746,742	2,796,843	2,912,813
Net increase (decrease) in cash and cash equivalents	1,656,837	(78,248)	115,397
Cash and cash equivalents at beginning of period	1,180,573	1,258,821	1,143,424
Cash and cash equivalents at end of period	2,837,410	1,180,573	1,258,821
Cash paid for interest	68,775	160,288	417,070
Parent Company [Member]
Cash Flows From Operating Activities: [Abstract]
Net income	618,121	435,030	500,758
Adjustments to reconcile net income to net cash provided by operating activities: [Abstract]
Equity in undistributed income of bank subsidiaries	(126,380)	(276,217)	(166,797)
Equity in undistributed income of non-bank subsidiaries	(11,738)	35,610	10,768
Other gains, net	3,415	(1,465)	(3,310)
Change in other assets	(1,160)	(15,225)	1,765
Change in other liabilities	389	850	855
Net cash provided by operating activities	484,967	209,033	340,509
Cash Flows From Investing Activities: [Abstract]
Investment in subsidiaries	(25,665)	(14,807)	(19,837)
Dissolution of subsidiaries	4,457	0	0
Net cash used in investing activities	(21,208)	(14,807)	(19,837)
Cash Flows From Financing Activities: [Abstract]
Repayment of subordinated debentures	(150,000)	0	0
Issuance of common and treasury stock, net	(4,874)	(4,933)	(7)
Dividends paid	(144,105)	(144,437)	(143,496)
Repurchase of common stock	(117,938)	(75,830)	(129,483)
Net cash used in financing activities	(416,917)	(225,200)	(272,986)
Net increase (decrease) in cash and cash equivalents	46,842	(30,974)	47,686
Cash and cash equivalents at beginning of period	183,805	214,779	167,093
Cash and cash equivalents at end of period	230,647	183,805	214,779
Cash paid for interest	$ 10,559	$ 14,064	$ 15,099

Uncategorized Items - bokf-2021

Label	Element	Value
Consumer [Member]
Goodwill	us-gaap_Goodwill	$ 43,458,000
Commercial [Member]
Goodwill	us-gaap_Goodwill	913,931,000
Funds Management and Other [Member]
Goodwill	us-gaap_Goodwill	0
Wealth Management [Member]
Goodwill	us-gaap_Goodwill	$ 90,702,000