BOK Financial (BOKF) 10-Q 1 May 24 2024 Q1 Quarterly report Financial data

Document And Entity Information

Document And Entity Information	3 Months Ended
	Mar. 31, 2024 shares
Document and Entity Information [Abstract]
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
Document Transition Report	false
Document Quarterly Report	true
Entity Registrant Name	BOK FINANCIAL CORP
Entity Central Index Key	0000875357
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
Entity Common Stock, Shares Outstanding	64,515,035
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Document Type	10-Q
Entity File Number	001-37811
Amendment Flag	false
Document Period End Date	Mar. 31, 2024
City Area Code	918
Local Phone Number	588-6000
Entity Address, Postal Zip Code	74192
Current Fiscal Year End Date	--12-31
Title of 12(b) Security	Common Stock, par value $0.00006 per share
Trading Symbol	BOKF
Security Exchange Name	NASDAQ

Consolidated Statements of Earn

Consolidated Statements of Earnings (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Interest revenue [Abstract]
Loans	$ 438,677	$ 367,870
Residential mortgage loans held for sale	923	979
Trading securities	68,237	34,009
Investment securities	7,829	8,928
Available for sale securities	113,488	88,736
Fair value option securities	195	3,893
Restricted equity securities	8,858	5,808
Interest-bearing cash and cash equivalents	7,005	6,506
Total interest revenue	645,212	516,729
Interest expense [Abstract]
Deposits	242,124	95,274
Borrowed funds	107,204	67,038
Subordinated debentures	2,312	2,069
Total interest expense	351,640	164,381
Net interest revenue	293,572	352,348
Provision for credit losses	8,000	16,000
Net interest revenue after provision for credit losses	285,572	336,348
Total fees and commissions	200,564	185,979
Other gains, net	4,269	2,251
Loss on derivatives, net	(8,633)	(1,344)
Loss on fair value option securities, net	(305)	(2,962)
Change in fair value of mortgage servicing rights	10,977	(6,059)
Loss on available for sale securities, net	(45,171)	0
Total other operating revenue	161,701	177,865
Noninterest Expense [Abstract]
Personnel	202,653	182,145
Business promotion	7,978	8,569
Professional fees and services	12,010	13,048
Net occupancy and equipment	30,293	28,459
FDIC and other insurance	8,740	7,315
FDIC special assessment	6,454	0
Data processing and communications	45,564	44,802
Printing, postage and supplies	3,997	3,893
Amortization of intangible assets	3,003	3,391
Mortgage banking costs	6,355	5,782
Other expense	13,337	8,408
Total other operating expense	340,384	305,812
Net income before taxes	106,889	208,401
Federal and state income taxes	23,195	45,905
Net income	83,694	162,496
Net income (loss) attributable to non-controlling interests	(9)	128
Net income attributable to BOK Financial Corporation shareholders	$ 83,703	$ 162,368
Earnings Per Share [Abstract]
Basic	$ 1.29	$ 2.43
Diluted	$ 1.29	$ 2.43
Average shares used in computation: [Abstract]
Basic	64,290,105	66,331,775
Diluted	64,290,105	66,331,775
Dividends declared per share	$ 0.55	$ 0.54
Brokerage and trading revenue [Member]
Total fees and commissions	$ 59,179	$ 52,396
Transaction card revenue [Member]
Total fees and commissions	25,493	25,621
Fiduciary and asset management revenue [Member]
Total fees and commissions	55,305	50,657
Deposit service charges and fees [Member]
Total fees and commissions	28,685	25,968
Mortgage banking revenue [Member]
Total fees and commissions	18,967	14,367
Other revenue [Member]
Total fees and commissions	$ 12,935	$ 16,970

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 83,694	$ 162,496
Other Comprehensive Income (Loss), before Tax [Abstract]
Net change in unrealized gain (loss)	(71,806)	124,045
Reclassification Adjustments Included in Earnings [Abstract]
Interest revenue, Investment securities	12,183	16,051
Loss on available for sale securities, net	45,171	0
Other comprehensive income (loss) before income taxes	(14,452)	140,096
Federal and state income taxes	(3,424)	31,695
Other comprehensive income (loss), net of income taxes	(11,028)	108,401
Comprehensive income	72,666	270,897
Comprehensive income (loss) attributable to non-controlling interests	(9)	128
Comprehensive income attributable to BOK Financial Corporation shareholders	$ 72,675	$ 270,769

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Assets [Abstract]
Cash and due from banks	$ 801,677	$ 947,613
Interest-bearing cash and cash equivalents	354,070	400,652
Trading securities	5,441,038	5,193,505
Investment securities, net of allowance	2,185,744	2,244,153
Available for sale securities	12,653,088	12,286,681
Fair value option securities	19,805	20,671
Restricted equity securities	382,549	423,099
Residential mortgage loans held for sale	75,449	56,935
Loans	24,172,560	23,904,968
Allowance for loan losses	(281,623)	(277,123)
Loans, net of allowance	23,890,937	23,627,845
Premises and equipment, net	628,050	622,223
Receivables	308,736	317,922
Goodwill	1,044,749	1,044,749
Intangible assets, net	56,894	59,979
Mortgage servicing rights	319,330	293,884
Real estate and other repossessed assets, net of allowance	2,860	2,875
Derivative contracts, net	263,493	410,304
Cash surrender value of bank-owned life insurance	410,368	409,548
Receivable on unsettled securities sales	67,854	391,910
Other assets	1,253,689	1,070,282
Total assets	50,160,380	49,824,830
Deposits [Abstract]
Non-interest bearing demand deposits	8,414,056	9,196,493
Interest-bearing deposits: [Abstract]
Transaction	22,748,185	20,964,101
Savings	854,397	847,085
Time	3,366,909	3,012,022
Total deposits	35,383,547	34,019,701
Funds purchased and repurchase agreements	1,261,517	1,122,748
Other borrowings	6,724,652	7,701,552
Subordinated debentures	131,154	131,150
Accrued interest, taxes and expense	318,622	338,996
Derivative contracts, net	438,605	587,473
Due on unsettled securities purchases	264,230	254,057
Other liabilities	506,418	523,734
Total liabilities	45,028,745	44,679,411
Shareholders' equity: [Abstract]
Common stock	5	5
Capital surplus	1,411,293	1,406,745
Retained earnings	5,259,646	5,211,512
Treasury stock	(932,065)	(876,720)
Accumulated other comprehensive income (loss)	(610,128)	(599,100)
Total shareholders' equity	5,128,751	5,142,442
Non-controlling interests	2,884	2,977
Total equity	5,131,635	5,145,419
Total liabilities and equity	$ 50,160,380	$ 49,824,830

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Investment securities [Abstract]
Investment Securities, Fair Value	$ 2,000,065	$ 2,072,586
Real estate and other repossessed assets, allowance	$ (5,355)	$ (5,355)
Shareholders' equity: [Abstract]
Common Stock, Par or Stated Value Per Share	$ 0.00006	$ 0.00006
Common Stock, Shares Authorized	2,500,000,000	2,500,000,000
Common Stock, Shares, Issued	(76,793,000)	(76,593,292)
Common Stock, Shares, Outstanding	(76,793,000)	(76,593,292)
Treasury stock, shares at cost (in shares)	12,277,965	11,626,115

Consolidated Statements of Chan

Consolidated Statements of Changes in Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Treasury Stock, Common	Accumulated Other Comprehensive Income (Loss) [Member]	Total Shareholders' Equity [Member]	Non-Controlling Interests [Member]
Balance, beginning of period (in shares) at Dec. 31, 2022		76,423			9,465
Balance, beginning of period at Dec. 31, 2022	$ 4,687,358	$ 5	$ 1,390,395	$ 4,824,164	$ (694,960)	$ (836,955)	$ 4,682,649	$ 4,709
Net income	162,496			162,368			162,368	128
Other comprehensive income (loss)	108,401					108,401	108,401
Repurchase of common stock (in shares)					447
Repurchase of common stock	(44,476)				$ (44,476)		(44,476)
Non-vested shares awarded, net (in shares)		133
Vesting of non-vested shares (in shares)					43
Vesting of non-vested shares	(4,501)				$ (4,501)		(4,501)
Share-based compensation	6,701		6,701				6,701
Cash dividends on common stock	(36,356)			(36,356)			(36,356)
Capital calls and distributions, net	(1,596)							(1,596)
Balance, end of period (in shares) at Mar. 31, 2023		76,556			9,955
Balance, end of period at Mar. 31, 2023	4,878,027	$ 5	1,397,096	4,950,176	$ (743,937)	(728,554)	4,874,786	3,241
Balance, beginning of period (in shares) at Dec. 31, 2023		76,593			11,626
Balance, beginning of period at Dec. 31, 2023	5,145,419	$ 5	1,406,745	5,211,512	$ (876,720)	(599,100)	5,142,442	2,977
Net income	83,694			83,703			83,703	(9)
Other comprehensive income (loss)	(11,028)					(11,028)	(11,028)
Repurchase of common stock (in shares)					617
Repurchase of common stock	(52,153)				$ (52,153)		(52,153)
Non-vested shares awarded, net (in shares)		200
Vesting of non-vested shares (in shares)					35
Vesting of non-vested shares	(3,192)				$ (3,192)		(3,192)
Share-based compensation	4,548		4,548				4,548
Cash dividends on common stock	(35,569)			(35,569)			(35,569)
Capital calls and distributions, net	(84)							(84)
Balance, end of period (in shares) at Mar. 31, 2024		76,793			12,278
Balance, end of period at Mar. 31, 2024	$ 5,131,635	$ 5	$ 1,411,293	$ 5,259,646	$ (932,065)	$ (610,128)	$ 5,128,751	$ 2,884

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash Flows From Operating Activities: [Abstract]
Net income	$ 83,694	$ 162,496
Adjustments to reconcile net income to net cash used in operating activities: [Abstract]
Provision for credit losses	8,000	16,000
Change in fair value of mortgage servicing rights due to market assumption changes	(10,977)	6,059
Change in the fair value of mortgage servicing rights due to principal payments	5,447	5,382
Net unrealized (gains) losses from derivative contracts	(67,516)	61,704
Share-based compensation	4,548	6,701
Depreciation and amortization	26,392	26,885
Net amortization of discounts and premiums	(8,923)	(4,163)
Net losses (gains) on financial instruments and other losses (gains), net	40,792	(2,009)
Net loss (gain) on mortgage loans held for sale	(1,644)	1,361
Mortgage loans originated for sale	(139,176)	(138,624)
Proceeds from sale of mortgage loans held for sale	124,187	139,088
Capitalized mortgage servicing rights	(2,516)	(2,498)
Change in trading and fair value option securities	(246,669)	2,140,101
Change in receivables	284,991	11,032
Change in other assets	23,196	6,721
Change in other liabilities	55,394	28,544
Net cash provided by (used in) operating activities	179,220	2,464,780
Cash Flows From Investing Activities: [Abstract]
Proceeds from maturities or redemptions of investment securities	57,642	64,514
Proceeds from maturities or redemptions of available for sale securities	417,103	313,935
Purchases of available for sale securities	(1,582,902)	(631,168)
Proceeds from sales of available for sale securities	735,994	0
Change in amount receivable on unsettled available for sale securities transactions	48,195	9,864
Loans originated, net of principal collected	(271,674)	(187,088)
Net proceeds from (payments on) derivative asset contracts	(5,533)	156,522
Net change in restricted equity securities	40,550	11,470
Proceeds from disposition of assets	4,624	7,401
Purchases of assets	(40,911)	(58,710)
Net cash provided by (used in) investing activities	(596,912)	(313,260)
Cash Flows From Financing Activities: [Abstract]
Net change in demand deposits, transaction deposits and savings accounts	1,008,959	(2,014,726)
Net change in time deposits	354,887	114,768
Net change in other borrowed funds	(839,632)	(677,232)
Net payments on derivative liability contracts	(1,613)	(158,021)
Net change in derivative margin accounts	(116,706)	579,188
Change in amount due on unsettled available for sale securities transactions	(89,807)	52,104
Issuance of common and treasury stock, net	(3,192)	(4,501)
Repurchase of common stock	(52,153)	(44,476)
Dividends paid	(35,569)	(36,356)
Net cash provided by (used in) financing activities	225,174	(2,189,252)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total	(192,518)	(37,732)
Cash and cash equivalents at beginning of period	1,348,265	1,401,716
Cash and cash equivalents at end of period	1,155,747	1,363,984
Supplemental Cash Flow Information: [Abstract]
Cash paid for interest	348,394	163,960
Cash paid for taxes	1,270	733
Net loans and bank premises transferred to repossessed real estate and other assets	77	225
Residential mortgage loans guaranteed by U.S. government agencies that became eligible for repurchase during the period	1,501	5,556
Conveyance of other real estate owned guaranteed by U.S. government agencies	1,371	1,150
Right-of-use assets obtained in exchange for operating lease liabilities	$ 10,562	$ 63,521

Significant Accounting Policies

Significant Accounting Policies	3 Months Ended
	Mar. 31, 2024
Accounting Policies [Abstract]
Significant Accounting Policies [Text Block]	Significant Accounting Policies Basis of Presentation The accompanying unaudited consolidated financial statements of BOK Financial have been prepared in accordance with accounting principles for interim financial information generally accepted in the United States and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. The unaudited consolidated financial statements include accounts of BOK Financial and its subsidiaries, principally BOKF, NA, BOK Financial Securities, Inc., and BOK Financial Private Wealth, Inc. Operating divisions of the Bank include Bank of Albuquerque, Bank of Oklahoma, Bank of Texas, BOK Financial in Arizona, Arkansas, Colorado and Kansas/Missouri, BOK Financial Mortgage and the TransFund electronic funds network. Certain reclassifications have been made to conform to the current period presentation. The financial information should be read in conjunction with BOK Financial's 2023 Form 10-K filed with the Securities and Exchange Commission, which contains audited financial statements. Amounts presented as of December 31, 2023 have been derived from the audited financial statements included in BOK Financial's 2023 Form 10-K but do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. Operating results for the three-month period ended March 31, 2024 are not necessarily indicative of the results that may be expected for the year ending December 31, 2024. Newly Adopted and Pending Accounting Policies Financial Accounting Standards Board FASB ASU 2023-01, Leases (Topic 842): Common Control Arrangements On March 27, 2023, the FASB issued ASU 2023-01 which, in part, amends the accounting for leasehold improvement in common-control arrangements. Under previous guidance, a lessee is generally required to amortize leasehold improvements that it owns over the shorter of the useful life of those improvements or the lease term. However, due to the nature of leasehold improvements made under leases between entities under common control, ASU 2023-01 requires a lessee in a common-control arrangement to amortize such leasehold improvements that it owns over the improvements' useful life to the common control group, regardless of the lease term. ASU 2023-01 is effective for fiscal years beginning after December 15, 2023, including interim periods within those fiscal years. Adoption of ASU 2023-01 did not have a material impact on the Company's financial statements. FASB ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures The FASB issued ASU 2023-07 on November 27, 2023 which is intended to improve reportable segment disclosure requirements. Under previous guidance, while entities were required to disclose segment revenue and measure of profit or loss, there has been limited disclosure around the reporting of segment expenses. In addition to enhanced disclosures about significant segment expenses, the amendments enhance interim disclosure requirements, clarify circumstances in which an entity can disclose multiple segment measures of profit or loss, provide new segment disclosure requirements for entities with a single reportable segment, and contain other disclosure requirements. The purpose of the amendments is to enable investors to better understand an entity’s overall performance and assess potential future cash flows. ASU 2023-07 is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. The Company is evaluating the requirements of the expanded segment disclosures but does not expect the additional disclosures to have a material impact on the reported segment information. FASB ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures The FASB issued ASU 2023-09 on December 14, 2023 which amends income tax disclosures to provide information to better assess how an entity’s operations and related tax risks and tax planning and operational opportunities affect its tax rate and prospects for future cash flows. The new guidance requires the entity to disclose specific categories in the rate reconciliation and provide additional information for reconciling items that meet a quantitative threshold. ASU 2023-09 is effective for annual periods beginning after December 15, 2024. The Company is currently assessing the impact ASU 2023-09 will have on its income tax disclosures. FASB ASU 2024-01, Compensation—Stock Compensation (Topic 718): Scope Application of Profits Interest and Similar Awards The FASB issued ASU 2024-01 on March 21, 2024 which provides illustrative guidance to help entities determine whether profits interest and similar awards should be accounted for as share-based payment arrangements within the scope of Topic 718, Compensation—Stock Compensation . The ASU is effective for annual periods beginning after December 15, 2024, including interim periods within those periods. Adoption of ASU 2024-01 is not expected to have a material impact on the Company's financial statements.

Securities

Securities	3 Months Ended
	Mar. 31, 2024
Marketable Securities [Abstract]
Securities [Text Block]	Securities Trading Securities The fair value and net unrealized gain (loss) included in trading securities are as follows (in thousands): March 31, 2024 December 31, 2023 Fair Value Net Unrealized Gain (Loss) Fair Value Net Unrealized Gain (Loss) U.S. government securities $ 426,825 $ (194) $ 10,959 $ 28 Residential agency mortgage-backed securities 4,898,485 8,571 5,105,137 98,124 Municipal securities 67,120 (142) 37,413 323 Other trading securities 48,608 127 39,996 160 Total trading securities $ 5,441,038 $ 8,362 $ 5,193,505 $ 98,635 Investment Securities The amortized cost and fair values of investment securities are as follows (in thousands): March 31, 2024 Amortized Carrying Fair Gross Unrealized Cost Value 1 Value Gain Loss Municipal securities $ 108,793 $ 108,793 $ 112,338 $ 3,828 $ (283) Mortgage-backed securities: Residential agency 2,196,121 2,044,972 1,858,027 99 (187,044) Commercial agency 17,258 15,990 14,987 — (1,003) Other debt securities 16,288 16,288 14,713 — (1,575) Total investment securities 2,338,460 2,186,043 2,000,065 3,927 (189,905) Allowance for credit losses (299) (299) — — — Investment securities, net of allowance $ 2,338,161 $ 2,185,744 $ 2,000,065 $ 3,927 $ (189,905) 1 Carrying value includes $152 million of net unrealized loss which remains in AOCI in the Consolidated Balance Sheets related to certain securities transferred during the second quarter of 2022 from the Available for Sale securities portfolio to the Investment securities portfolio. December 31, 2023 Amortized Carrying Fair Gross Unrealized Cost Value 1 Value Gain Loss Municipal securities $ 120,705 $ 120,705 $ 125,525 $ 5,014 $ (194) Mortgage-backed securities: Residential agency 2,255,340 2,092,083 1,917,810 125 (174,398) Commercial agency 17,258 15,914 15,067 — (847) Other debt securities 15,787 15,787 14,184 — (1,603) Total investment securities 2,409,090 2,244,489 2,072,586 5,139 (177,042) Allowance for credit losses (336) (336) — — — Investment securities, net of allowance $ 2,408,754 $ 2,244,153 $ 2,072,586 $ 5,139 $ (177,042) 1 Carrying value includes $165 million of net unrealized loss which remains in AOCI in the Consolidated Balance Sheets related to certain securities transferred during the second quarter of 2022 from the Available for Sale securities portfolio to the Investment securities portfolio. The amortized cost and fair values of investment securities at March 31, 2024, 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: Carrying value $ 19,248 $ 95,707 $ 26,103 $ 13 $ 141,071 3.27 Fair value 19,468 98,033 24,524 13 142,038 Residential mortgage-backed securities: Carrying value $ 2,044,972 2 Fair value 1,858,027 Total investment securities: Carrying value $ 2,186,043 Fair value 2,000,065 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 4.9 years based upon current prepayment assumptions. Temporarily Impaired Investment Securities (dollars in thousands): March 31, 2024 Number of Securities Less Than 12 Months 12 Months or Longer Total Fair Unrealized Fair Unrealized Fair Unrealized Investment: Municipal securities 20 $ 17,310 $ 81 $ 6,587 $ 202 $ 23,897 $ 283 Mortgage-backed securities: Residential agency 116 — — 1,857,000 187,044 1,857,000 187,044 Commercial agency 2 — — 14,987 1,003 14,987 1,003 Other debt securities 3 — — 8,700 1,575 8,700 1,575 Total investment securities 141 $ 17,310 $ 81 $ 1,887,274 $ 189,824 $ 1,904,584 $ 189,905 December 31, 2023 Number of Securities Less Than 12 Months 12 Months or Longer Total Fair Unrealized Fair Unrealized Fair Unrealized Investment: Municipal securities 13 $ 1,931 $ 5 $ 6,600 $ 189 $ 8,531 $ 194 Mortgage-backed securities: Residential agency 116 — — 1,916,732 174,398 1,916,732 174,398 Commercial agency 2 — — 15,067 847 15,067 847 Other debt securities 3 — — 8,672 1,603 8,672 1,603 Total investment securities 134 $ 1,931 $ 5 $ 1,947,071 $ 177,037 $ 1,949,002 $ 177,042 Available for Sale Securities The amortized cost and fair value of available for sale securities are as follows (in thousands): March 31, 2024 Amortized Fair Gross Unrealized Cost Value Gain Loss U.S. Treasury $ 1,000 $ 920 $ — $ (80) Municipal securities 329,216 304,826 — (24,390) Mortgage-backed securities: Residential agency 8,095,352 7,816,688 20,132 (298,796) Residential non-agency 885,059 846,805 11,106 (49,360) Commercial agency 3,985,220 3,683,376 1,197 (303,041) Other debt securities 500 473 — (27) Total available for sale securities $ 13,296,347 $ 12,653,088 $ 32,435 $ (675,694) December 31, 2023 Amortized Fair Gross Unrealized Cost Value Gain Loss U.S. Treasury $ 1,000 $ 925 $ — $ (75) Municipal securities 544,707 502,833 1 (41,875) Mortgage-backed securities: Residential agency 7,066,645 6,834,720 36,983 (268,908) Residential non-agency 833,535 799,877 12,865 (46,523) Commercial agency 4,456,918 4,147,853 2,972 (312,037) Other debt securities 500 473 — (27) Total available for sale securities $ 12,903,305 $ 12,286,681 $ 52,821 $ (669,445) The amortized cost and fair values of available for sale securities at March 31, 2024, 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 $ 473,589 $ 2,480,160 $ 915,033 $ 447,154 $ 4,315,936 5.19 Fair value 468,688 2,254,408 841,253 425,246 3,989,595 Residential mortgage-backed securities: Amortized cost $ 8,980,411 2 Fair value 8,663,493 Total available for sale securities: Amortized cost $ 13,296,347 Fair value 12,653,088 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 4.2 years based upon current prepayment assumptions. Sales of available for sale securities resulted in gains and losses as follows (in thousands): Three Months Ended 2024 2023 Proceeds $ 735,994 $ — Gross realized gains 233 — Gross realized losses (45,404) — Related federal and state income tax benefit (10,624) — 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 $18.9 billion at March 31, 2024 and $13.9 billion at December 31, 2023. The secured parties do not have the right to sell or repledge these securities. Temporarily Impaired Available for Sale Securities (Dollars in thousands) March 31, 2024 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 $ — $ — $ 920 $ 80 $ 920 $ 80 Municipal securities 135 3,139 30 298,162 24,360 301,301 24,390 Mortgage-backed securities: Residential agency 711 2,179,355 10,501 3,502,950 288,296 5,682,306 298,797 Residential non-agency 38 138,197 530 532,619 48,829 670,815 49,359 Commercial agency 245 241,331 2,625 3,148,535 300,416 3,389,866 303,041 Other debt securities 1 — — 473 27 473 27 Total available for sale securities 1,131 $ 2,562,022 $ 13,686 $ 7,483,659 $ 662,008 $ 10,045,681 $ 675,694 December 31, 2023 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 $ — $ — $ 925 $ 75 $ 925 $ 75 Municipal securities 190 6,799 410 494,955 41,465 501,754 41,875 Mortgage-backed securities: Residential agency 630 690,118 3,689 3,717,975 265,219 4,408,093 268,908 Residential non-agency 32 116,077 1,244 451,370 45,279 567,447 46,523 Commercial agency 269 392,828 2,626 3,421,757 309,411 3,814,585 312,037 Other debt securities 1 — — 473 27 473 27 Total available for sale securities 1,123 $ 1,205,822 $ 7,969 $ 8,087,455 $ 661,476 $ 9,293,277 $ 669,445 Based on evaluations of impaired securities as of March 31, 2024, the Company does not intend to sell any impaired available for sale debt 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. Changes in the fair value are recognized in earnings as they occur. Certain securities 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): March 31, 2024 December 31, 2023 Fair Value Net Unrealized Gain (Loss) Fair Value Net Unrealized Gain (Loss) Residential agency mortgage-backed securities $ 19,805 $ (1,711) $ 20,671 $ (1,406)

Derivatives

Derivatives	3 Months Ended
	Mar. 31, 2024
Derivative Instrument Detail [Abstract]
Derivatives [Text Block]	Derivatives 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 reported in earnings as they occur. Credit risk is also considered in determining fair value. Deterioration in the credit rating of customer or other counterparties reduce 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 arrangements 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 type by counterparty basis. Derivative contracts may 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. None of these derivative contracts have been designated as hedging instruments for accounting purposes. Customer Risk Management Programs BOK Financial offers programs to 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 borrowers 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 the risk of 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. Trading BOK Financial may offer derivative instruments such as to-be-announced 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 in the Consolidated Statements of Earnings. Internal Risk Management Programs BOK Financial may use derivative contracts in managing its interest rate sensitivity, as part of its economic hedge of the change 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 the 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. As discussed in Note 5, 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 5 for additional discussion of notional, fair value and impact on earnings of these contracts. The following table summarizes the fair values of derivative contracts recorded as "derivative contracts" assets and liabilities in the balance sheet at March 31, 2024 (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 $ 3,075,103 $ 118,237 $ (3,844) $ 114,393 $ (111,283) $ 3,110 Energy contracts 7,266,492 754,565 (461,295) 293,270 (117,521) 175,749 Foreign exchange contracts 56,590 55,687 — 55,687 (842) 54,845 Equity option contracts 1,859 61 — 61 (50) 11 Total customer risk management programs 10,400,044 928,550 (465,139) 463,411 (229,696) 233,715 Trading 19,616,813 67,692 (40,165) 27,527 (44) 27,483 Internal risk management programs 455,912 3,608 (1,313) 2,295 — 2,295 Total derivative contracts $ 30,472,769 $ 999,850 $ (506,617) $ 493,233 $ (229,740) $ 263,493 Liabilities 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 $ 3,065,103 $ 116,796 $ (3,844) $ 112,952 $ — $ 112,952 Energy contracts 7,720,466 753,145 (461,295) 291,850 (29,444) 262,406 Foreign exchange contracts 56,254 55,161 — 55,161 — 55,161 Equity option contracts 1,859 61 — 61 — 61 Total customer risk management programs 10,843,682 925,163 (465,139) 460,024 (29,444) 430,580 Trading 23,751,156 93,502 (40,165) 53,337 (46,563) 6,774 Internal risk management programs 38,617 2,564 (1,313) 1,251 — 1,251 Total derivative contracts $ 34,633,455 $ 1,021,229 $ (506,617) $ 514,612 $ (76,007) $ 438,605 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, 2023 (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 $ 2,754,476 $ 108,450 $ (6,810) $ 101,640 $ (94,608) $ 7,032 Energy contracts 7,846,190 836,425 (399,148) 437,277 (169,141) 268,136 Foreign exchange contracts 54,999 53,863 — 53,863 (872) 52,991 Equity option contracts 3,316 54 — 54 (44) 10 Total customer risk management programs 10,658,981 998,792 (405,958) 592,834 (264,665) 328,169 Trading 16,264,818 118,545 (37,111) 81,434 (6,996) 74,438 Internal risk management programs 425,014 7,697 — 7,697 — 7,697 Total derivative contracts $ 27,348,813 $ 1,125,034 $ (443,069) $ 681,965 $ (271,661) $ 410,304 Liabilities 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 $ 2,754,476 $ 108,402 $ (6,810) $ 101,592 $ — $ 101,592 Energy contracts 8,254,004 831,467 (399,148) 432,319 (6,441) 425,878 Foreign exchange contracts 54,405 53,065 — 53,065 — 53,065 Equity option contracts 3,316 54 — 54 — 54 Total customer risk management programs 11,066,201 992,988 (405,958) 587,030 (6,441) 580,589 Trading 20,644,156 224,648 (37,111) 187,537 (181,917) 5,620 Internal risk management programs 2,244 1,264 — 1,264 — 1,264 Total derivative contracts $ 31,712,601 $ 1,218,900 $ (443,069) $ 775,831 $ (188,358) $ 587,473 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 income statement (in thousands): Three Months Ended March 31, 2024 March 31, 2023 Brokerage Gain (Loss) on Derivatives, Net Brokerage Gain (Loss) on Derivatives, Net Customer risk management programs: Interest rate contracts $ 2,460 $ — $ 1,770 $ — Energy contracts 3,815 — 6,553 — Foreign exchange contracts 50 — 31 — Equity option contracts — — — — Total customer risk management programs 6,325 — 8,354 — Trading 1 83,706 — (63,093) — Internal risk management programs — (8,633) — (1,344) Total derivative contracts $ 90,031 $ (8,633) $ (54,739) $ (1,344) 1 Represents changes in fair value of to-be-announced securities and other derivative instruments 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 Statements of Earnings.

Loans and Allowances for Credit

Loans and Allowances for Credit Losses	3 Months Ended
	Mar. 31, 2024
Loans and Leases Receivable, Net Amount [Abstract]
Loans [Text Block]	Loans and Allowances for Credit Losses 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 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 principal amount outstanding. 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 more than 90 days 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. Accrued but not paid interest receivable is included in Receivables in the Consolidated Balance Sheets. Payments 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. Modifications of loans to existing borrowers generally consist of interest rate reductions, extension of payment terms, or a combination of these. Modifications may arise either voluntarily through negotiations with the borrower or involuntarily through court order. Payment deferrals up to six months are generally considered to be short-term modifications. Generally, principal and accrued but unpaid interest are not voluntarily forgiven. A change to the allowance for credit losses is generally not recorded upon modification because the effect of most modifications made to borrowers experiencing financial difficulty is already included in the allowance methodology. Performing loans may be renewed under the current collateral value, debt service ratio and other underwriting standards. Nonaccruing loans may 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 Other gains (losses), net in the Consolidated Statements of Earnings. 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 modification. The charge-off amount is determined through a quarterly evaluation of available cash resources and collateral values. 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 may have 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. 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 the expected cash flows discounted at the original note rate plus a liquidity spread. Guaranteed loans may be modified in accordance with U.S. government agency guidelines. Interest continues to accrue based on 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 a further disaggregation of portfolio segments based on the risk characteristics of the loans and the Company's method for monitoring and assessing credit risk. Portfolio segments of the loan portfolio are as follows (in thousands): March 31, 2024 December 31, 2023 Fixed Variable Non-accrual Total Fixed Variable Non-accrual Total Commercial $ 3,597,543 $ 11,460,704 $ 74,620 $ 15,132,867 $ 3,558,563 $ 11,135,075 $ 110,131 $ 14,803,769 Commercial real estate 784,301 4,430,289 22,087 5,236,677 791,757 4,538,570 7,320 5,337,647 Loans to individuals 2,315,236 1,464,972 22,808 3,803,016 2,282,914 1,452,620 28,018 3,763,552 Total $ 6,697,080 $ 17,355,965 $ 119,515 $ 24,172,560 $ 6,633,234 $ 17,126,265 $ 145,469 $ 23,904,968 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 March 31, 2024, outstanding commitments totaled $14.4 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 March 31, 2024, outstanding standby letters of credit totaled $734 million. Allowances for Credit Losses and Accrual for Off-balance Sheet Credit Risk from Unfunded Loans Commitments 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 ongoing 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, for real property held as collateral for loans, 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% 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 a 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 cancelable 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 Allowance for Credit Losses. Recoveries of loans previously charged off are added to the allowance when received. 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 summarized as follows (in thousands): Three Months Ended March 31, 2024 Commercial Commercial Real Estate Loans to Individuals Total Allowance for loan losses: Beginning balance $ 141,232 $ 94,718 $ 41,173 $ 277,123 Provision for loan losses 8,311 3,995 (2,346) 9,960 Loans charged off (4,240) (1,250) (1,570) (7,060) Recoveries of loans previously charged off 964 16 620 1,600 Ending balance $ 146,267 $ 97,479 $ 37,877 $ 281,623 Allowance for off-balance sheet credit risk from unfunded loan commitments: Beginning balance $ 19,762 $ 27,439 $ 1,776 $ 48,977 Provision for off-balance sheet credit risk (1,972) 426 (112) (1,658) Ending balance $ 17,790 $ 27,865 $ 1,664 $ 47,319 Three Months Ended March 31, 2023 Commercial Commercial Real Estate Loans to Individuals Total Allowance for loan losses: Beginning balance $ 131,586 $ 57,648 $ 46,470 $ 235,704 Provision for loan losses 6,330 10,426 (2,231) 14,525 Loans charged off (12) (2,208) (1,447) (3,667) Recoveries of loans previously charged off 1,994 137 767 2,898 Ending balance $ 139,898 $ 66,003 $ 43,559 $ 249,460 Allowance for off-balance sheet credit risk from unfunded loan commitments: Beginning balance $ 18,246 $ 40,490 $ 2,183 $ 60,919 Provision for off-balance sheet credit risk 2,362 (279) (59) 2,024 Ending balance $ 20,608 $ 40,211 $ 2,124 $ 62,943 An $8.0 million provision for credit losses was necessary for the first quarter of 2024, reflecting continued loan growth and a stable economic outlook. The allowance for loan losses and recorded investment of the related loans by portfolio segment for each measurement method at March 31, 2024 is as follows (in thousands): Collectively Measured Individually Measured Total Recorded Investment Related Allowance Recorded Investment Related Allowance Recorded Investment Related Commercial $ 15,058,247 $ 143,307 $ 74,620 $ 2,960 $ 15,132,867 $ 146,267 Commercial real estate 5,214,590 97,479 22,087 — 5,236,677 97,479 Loans to individuals 3,780,208 37,877 22,808 — 3,803,016 37,877 Total $ 24,053,045 $ 278,663 $ 119,515 $ 2,960 $ 24,172,560 $ 281,623 The allowance for loan losses and recorded investment of the related loans by portfolio segment for each measurement method at December 31, 2023 is as follows (in thousands): Collectively Measured Individually Measured Total Recorded Investment Related Allowance Recorded Investment Related Allowance Recorded Investment Related Commercial $ 14,693,638 $ 138,540 $ 110,131 $ 2,692 $ 14,803,769 $ 141,232 Commercial real estate 5,330,327 94,718 7,320 — 5,337,647 94,718 Loans to individuals 3,735,534 41,173 28,018 — 3,763,552 41,173 Total $ 23,759,499 $ 274,431 $ 145,469 $ 2,692 $ 23,904,968 $ 277,123 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 identifies 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 March 31, 2024 by the risk grade categories and vintage (in thousands): Origination Year 2024 2023 2022 2021 2020 Prior Revolving Loans Revolving Loans Converted to Term Loans Total Commercial: Healthcare Pass $ 165,523 $ 638,346 $ 924,230 $ 573,778 $ 382,923 $ 1,095,684 $ 288,056 $ 14 $ 4,068,554 Special Mention — 15,000 — 1,254 — 20,027 855 — 37,136 Accruing Substandard — 1,492 429 18,397 58,753 10,896 975 — 90,942 Nonaccrual — — — — — 49,307 — — 49,307 Total healthcare 165,523 654,838 924,659 593,429 441,676 1,175,914 289,886 14 4,245,939 Loans charged off, year-to-date — — — — — 502 — — 502 Services Pass 183,565 786,684 514,841 380,227 219,684 725,856 677,588 534 3,488,979 Special Mention — — 1,042 1,305 1,321 9,243 31 — 12,942 Accruing Substandard — — 13,380 155 341 7,204 2,351 750 24,181 Nonaccrual — — — 1,487 349 — 1,483 — 3,319 Total services 183,565 786,684 529,263 383,174 221,695 742,303 681,453 1,284 3,529,421 Loans charged off, year-to-date — — — — — — — — — Energy Pass 58,061 141,197 90,222 13,033 7,447 20,635 3,067,570 — 3,398,165 Special Mention — — — — — — 13,950 — 13,950 Accruing Substandard — — — — — — 16,613 — 16,613 Nonaccrual — — — — — 89 14,902 — 14,991 Total energy 58,061 141,197 90,222 13,033 7,447 20,724 3,113,035 — 3,443,719 Loans charged off, year-to-date — — — — — — — — — General business Pass 285,096 845,326 383,429 215,106 134,121 378,163 1,569,156 1,945 3,812,342 Special Mention — 6,110 8,244 8,594 — 1,602 10,611 6 35,167 Accruing Substandard — 3,375 37,682 1,280 1,235 6,701 9,003 — 59,276 Nonaccrual — 994 101 — — 42 5,862 4 7,003 Total general business 285,096 855,805 429,456 224,980 135,356 386,508 1,594,632 1,955 3,913,788 Loans charged off, year-to-date — 27 1,399 — — 158 2,154 — 3,738 Total commercial 692,245 2,438,524 1,973,600 1,214,616 806,174 2,325,449 5,679,006 3,253 15,132,867 Commercial real estate: Pass 18,763 418,504 2,059,848 1,061,396 386,041 1,127,922 119,823 — 5,192,297 Special Mention — 440 — — — 16,527 — — 16,967 Accruing Substandard — — — — — 5,326 — — 5,326 Nonaccrual — 2,992 — — — 19,095 — — 22,087 Total commercial real estate 18,763 421,936 2,059,848 1,061,396 386,041 1,168,870 119,823 — 5,236,677 Loans charged off, year-to-date — — — — — 1,250 — — 1,250 Origination Year 2024 2023 2022 2021 2020 Prior Revolving Loans Revolving Loans Converted to Term Loans Total Loans to individuals: Residential mortgage Pass 96,002 405,724 319,050 336,878 343,246 284,962 367,761 21,386 2,175,009 Special Mention — 225 167 3 — 161 3,290 — 3,846 Accruing Substandard — — — — — — 279 1 280 Nonaccrual — 120 414 351 522 8,994 2,441 607 13,449 Total residential mortgage 96,002 406,069 319,631 337,232 343,768 294,117 373,771 21,994 2,192,584 Loans charged off, year-to-date — — — — — 2 5 — 7 Residential mortgage guaranteed by U.S. government agencies Pass — 361 3,012 2,204 3,806 120,856 — — 130,239 Nonaccrual — — — — 280 8,937 — — 9,217 Total residential mortgage guaranteed by U.S. government agencies — 361 3,012 2,204 4,086 129,793 — — 139,456 Personal: Pass 91,355 215,282 210,876 145,542 124,996 186,791 493,653 100 1,468,595 Special Mention — 28 13 51 13 3 — — 108 Accruing Substandard — — 24 — 1 144 1,962 — 2,131 Nonaccrual — 31 29 12 9 12 32 17 142 Total personal 91,355 215,341 210,942 145,605 125,019 186,950 495,647 117 1,470,976 Loans charged off, year-to-date 1 1,461 40 45 12 — — — 5 1,563 Total loans to individuals 187,357 621,771 533,585 485,041 472,873 610,860 869,418 22,111 3,803,016 Total loans $ 898,365 $ 3,482,231 $ 4,567,033 $ 2,761,053 $ 1,665,088 $ 4,105,179 $ 6,668,247 $ 25,364 $ 24,172,560 1 Includes charge-offs on deposit overdrafts, which are generally charged off at 60 days past due. The following table summarizes the Company's loan portfolio at December 31, 2023 by the risk grade categories and vintage (in thousands): Origination Year 2023 2022 2021 2020 2019 Prior Revolving Loans Revolving Loans Converted to Term Loans Total Commercial: Healthcare Pass 650,768 895,602 590,736 409,001 331,897 809,858 281,378 15 3,969,255 Special Mention — — — 21,791 — 31,235 5 — 53,031 Accruing Substandard — 2,128 18,508 6,911 — 10,896 975 — 39,418 Nonaccrual — — — 30,290 23,129 28,110 — — 81,529 Total healthcare 650,768 897,730 609,244 467,993 355,026 880,099 282,358 15 4,143,233 Loans charged off, year-to-date — — — — 2,500 — — — 2,500 Services Pass 900,090 526,776 401,872 228,818 106,112 643,477 730,729 595 3,538,469 Special Mention — 1,085 1,520 1,341 534 4,522 81 — 9,083 Accruing Substandard — 13,712 178 326 3,972 3,746 3,108 13 25,055 Nonaccrual — — 1,635 338 — — 1,643 — 3,616 Total services 900,090 541,573 405,205 230,823 110,618 651,745 735,561 608 3,576,223 Loans charged off, year-to-date — — 3,060 — — — 2,642 — 5,702 Energy Pass $ 190,122 $ 100,006 $ 43,769 $ 7,876 $ 9,562 $ 11,583 $ 3,025,590 $ — $ 3,388,508 Special Mention — — — — — — 13,950 — 13,950 Accruing Substandard — — — — — — 16,800 — 16,800 Nonaccrual — — — — — 99 17,744 — 17,843 Total energy 190,122 100,006 43,769 7,876 9,562 11,682 3,074,084 — 3,437,101 Loans charged off, year-to-date — — — — — — — — — General business Pass 942,468 436,832 224,735 138,951 101,100 287,744 1,389,128 2,164 3,523,122 Special Mention 10,264 16,167 8,420 1,253 321 8,295 897 — 45,617 Accruing Substandard 4,401 33,194 1,716 27 — — 31,992 — 71,330 Nonaccrual — 1,134 — — — 48 5,956 5 7,143 Total general business 957,133 487,327 234,871 140,231 101,421 296,087 1,427,973 2,169 3,647,212 Loans charged off, year-to-date — — 4,598 2 — 48 10 38 4,696 Total commercial 2,698,113 2,026,636 1,293,089 846,923 576,627 1,839,613 5,519,976 2,792 14,803,769 Commercial real estate: Pass 396,891 1,941,913 1,194,759 416,647 513,555 705,092 136,095 — 5,304,952 Special Mention — 476 — — — 19,171 — — 19,647 Accruing Substandard 2,992 — 3 — — 2,733 — — 5,728 Nonaccrual — — — — 7,170 150 — — 7,320 Total commercial real estate 399,883 1,942,389 1,194,762 416,647 520,725 727,146 136,095 — 5,337,647 Loans charged off, year-to-date — — — — — 8,446 — — 8,446 Origination Year 2023 2022 2021 2020 2019 Prior Revolving Loans Revolving Loans Converted to Term Loans Total Loans to individuals: Residential mortgage Pass 426,089 320,733 342,927 349,742 54,801 243,356 375,739 23,895 2,137,282 Special Mention 157 140 131 1,361 18 134 2,982 93 5,016 Accruing Substandard — 150 — — 37 49 50 — 286 Nonaccrual 79 1,419 237 544 344 12,381 2,387 665 18,056 Total residential mortgage 426,325 322,442 343,295 351,647 55,200 255,920 381,158 24,653 2,160,640 Loans charged off, year-to-date — — 51 4 — 17 — 1 73 Residential mortgage guaranteed by U.S. government agencies Pass 633 1,788 2,220 4,297 6,441 124,719 — — 140,098 Nonaccrual — — — 280 375 9,054 — — 9,709 Total residential mortgage guaranteed by U.S. government agencies 633 1,788 2,220 4,577 6,816 133,773 — — 149,807 Personal: Pass 218,401 229,580 149,291 136,215 75,348 137,629 503,841 145 1,450,450 Special Mention 66 39 106 30 8 — 1,918 3 2,170 Accruing Substandard — 64 12 9 144 — 3 — 232 Nonaccrual 4 51 9 16 3 12 158 — 253 Total personal 218,471 229,734 149,418 136,270 75,503 137,641 505,920 148 1,453,105 Loans charged off, year-to-date 1 5,636 82 96 43 — 10 6 26 5,899 Total loans to individuals 645,429 553,964 494,933 492,494 137,519 527,334 887,078 24,801 3,763,552 Total loans $ 3,743,425 $ 4,522,989 $ 2,982,784 $ 1,756,064 $ 1,234,871 $ 3,094,093 $ 6,543,149 $ 27,593 $ 23,904,968 1 Includes charge-offs on deposit overdrafts, which are generally charged off at 60 days past due. Nonaccruing Loans A summary of nonaccruing loans at March 31, 2024 follows (in thousands): As of March 31, 2024 Total With No With Allowance Related Allowance Commercial: Healthcare $ 49,307 $ 9,668 $ 39,639 $ 2,100 Services 3,319 1,542 1,777 460 Energy 14,991 14,991 — — General business 7,003 6,362 641 400 Total commercial 74,620 32,563 42,057 2,960 Commercial real estate 22,087 22,087 — — Loans to individuals: Residential mortgage 13,449 13,449 — — Residential mortgage guaranteed by U.S. government agencies 9,217 9,217 — — Personal 142 142 — — Total loans to individuals 22,808 22,808 — — Total $ 119,515 $ 77,458 $ 42,057 $ 2,960 A summary of nonaccruing loans at December 31, 2023 follows (in thousands): As of December 31, 2023 Total With No With Allowance Related Allowance Commercial: Healthcare $ 81,529 $ 40,372 $ 41,157 $ 1,478 Services 3,616 1,684 1,932 1,214 Energy 17,843 17,843 — — General business 7,143 7,143 — — Total commercial 110,131 67,042 43,089 2,692 Commercial real estate 7,320 7,320 — — Loans to individuals: Residential mortgage 18,056 18,056 — — Residential mortgage guaranteed by U.S. government agencies 9,709 9,709 — — Personal 253 253 — — Total loans to individuals 28,018 28,018 — — Total $ 145,469 $ 102,380 $ 43,089 $ 2,692 Loan Modifications to Borrowers Experiencing Financial Difficulty At March 31, 2024 the Company had $52 million of loan modifications to borrowers experiencing financial difficulty, including $47 million of healthcare loans. Modifications generally consist of interest rate reductions, an other than insignificant payment delay, term extension or a combination. Approximately $51 million of the modifications are term extensions of healthcare, services and general business loans, and $1.8 million are combination modifications to loans to individuals. During the three months ended March 31, 2024, $4.2 million of residential mortgage loans guaranteed by U.S. government agencies that were modified in the previous twelve months defaulted. A payment default is defined as being 30 or more days past due after modification. At March 31, 2023, the Company had $35 million of loan modifications to borrowers experiencing financial difficulty, including $26 million of healthcare loans and $8.4 million of residential mortgage loans guaranteed by U.S. government agencies, with the entirety of these modifications being combination modifications. During the three months ended March 31, 2023, $511 thousand of residential mortgage loans guaranteed by U.S

Mortgage Banking Activities

Mortgage Banking Activities	3 Months Ended
	Mar. 31, 2024
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 retained for investment. Residential mortgage loans originated for sale by the Company are carried at fair value based on sales commitments and market quotes. Changes in the fair value of mortgage loans held for sale are included in Other operating revenue – Mortgage banking revenue. Residential mortgage loans held for sale also includes the fair value of residential mortgage loan commitments and forward sales commitments, which are considered derivative contracts that have not been designated as hedging instruments for accounting purposes. 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): March 31, 2024 December 31, 2023 Unpaid Principal Balance/ Fair Value Unpaid Principal Balance/ Fair Value Residential mortgage loans held for sale $ 73,937 $ 73,090 $ 56,922 $ 56,457 Residential mortgage loan commitments 67,951 2,473 34,783 1,379 Forward sales contracts 108,070 (114) 75,448 (901) $ 75,449 $ 56,935 No residential mortgage loans held for sale were 90 days or more past due or considered impaired as of March 31, 2024 or December 31, 2023. No credit losses were recognized on residential mortgage loans held for sale for the three month period ended March 31, 2024 and 2023. Mortgage banking revenue was as follows (in thousands): Three Months Ended 2024 2023 Production revenue: Net realized gains (losses) on sale of mortgage loans $ 2,026 $ (1,731) Net change in unrealized gain (loss) on mortgage loans held for sale (382) 370 Net change in the fair value of mortgage loan commitments 1,094 1,640 Net change in the fair value of forward sales contracts 787 (912) Total production revenue (loss) 3,525 (633) Servicing revenue 15,442 15,000 Total mortgage banking revenue $ 18,967 $ 14,367 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 for accounting purposes 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 Mortgage servicing rights may be originated or purchased. Both originated and purchased mortgage servicing rights are initially recognized at fair value. The Company has elected to carry all mortgage servicing rights at fair value. Changes in the fair value are recognized in earnings as they occur. 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): March 31, 2024 December 31, 2023 Number of residential mortgage loans serviced for others 122,276 115,967 Outstanding principal balance of residential mortgage loans serviced for others $ 21,432,048 $ 20,382,192 Weighted average interest rate 3.66 % 3.64 % Remaining term (in months) 278 280 The following represents activity in capitalized mortgage servicing rights (in thousands): Three Months Ended March 31, 2024 2023 Beginning Balance $ 293,884 $ 277,608 Additions 2,516 2,500 Acquisitions 17,400 31,138 Change in fair value due to principal payments (5,447) (5,384) Change in fair value due to market assumption changes 10,977 (6,059) Ending Balance $ 319,330 $ 299,803 Changes in the fair value of mortgage servicing rights due to market assumption changes are included in Other operating revenue in the Consolidated Statements of Earnings. Changes in fair value due to principal payments 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 market assumptions used to determine fair value based on significant unobservable inputs were as follows: March 31, 2024 December 31, 2023 Discount rate – risk-free rate plus a market premium 9.82% 9.72% Prepayment rate - based upon loan interest rate, original term and loan type 6.83% 7.34% Loan servicing costs – annually per loan based upon loan type: Performing loans $73 - $94 $69 - $94 Delinquent loans $150 - $500 $150 - $500 Loans in foreclosure $875 - $8,000 $875 - $8,000 Escrow earnings rate – indexed to rates paid on deposit accounts with comparable average life 4.27% 3.90% Primary/secondary mortgage rate spread 115 bps 105 bps Delinquency rate 2.06% 2.06% Changes in primary residential mortgage interest rates directly affect the prepayment speeds used in valuing our mortgage servicing rights. 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 periodically for changes in market conditions and adjusted to better correlate with actual performance of BOK Financial's servicing portfolio.

Commitments and Contingent Liab

Commitments and Contingent Liabilities	3 Months Ended
	Mar. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies Disclosure [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 252,233 Visa Class B-1 shares (formerly Class B). On January 23, 2024, Visa, Inc. stockholders approved an option to convert up to 50% of our Class B-1 shares to Visa Class C shares and subsequently to freely transferable Visa Class A common shares (the "Exchange Offer") subject to holding periods and certain other conditions contained in the Exchange Offer. The Exchange Offer opened on April 8, 2024, and is scheduled to expire at the end of the day on May 3, 2024. The Company tendered its Class B-1 Visa shares under the Exchange Offer and expects to monetize up to 50% of the Class B-1 shares. Conversion of Class B-1 shares would not reduce our proportionate share of the covered litigation losses which may dilute our remaining Class B shares if the escrow fund is not adequate to cover final litigation costs. BOKF, NA is subject to litigation related to its role as Indenture Trustee for multiple municipal bonds to which Christopher Brogdon acted as borrower. The principal amount of the bonds remaining unpaid at this time is $33 million. Mr. Brogdon is obligated to pay the bonds in full by virtue of a Judgment in the USDC of New Jersey which allows the Securities and Exchange Commission to pursue collection to satisfy the Judgment, which the SEC continues to pursue. The remaining cases are (i) Robert Elliot & Marvin Loeb on behalf of a class of persons purchasing bonds in multiple municipal bond issuances v. BOKF, NA, USDC District of New Jersey, Case No. 2:16-cv-05218-KM-JBC (commenced 11/20/2015); and (ii) Burn Rose, LLC et al v. BOKF, NA d/b/a BOK, Tulsa County District Court Case, No. CJ-2016-03325 (commenced 9/22/2016). In the New Jersey Class Action and the Tulsa County Burn Rose action, the claimants allege that BOKF, NA was complicit in the fraud committed by Mr. Brogdon. BOKF, NA has multiple defenses to the claims, including the defense that it is exculpated by the terms of the various bond indentures. No action has been taken in the class action by the plaintiffs to establish the class and the amount of the damages, if any, cannot be reasonably estimated. Approximately $3 million is claimed as damages in the Burn Rose action. Management is advised that a loss on the claims in both the Class Action and the Burn Rose action is not probable. 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 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 March 31, 2024, the Company has $405 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. These investments are recognized in Other assets on the Consolidated Balance Sheets. This investment balance also includes $99 million of unfunded commitments included in Other liabilities on the Consolidated Balance Sheets.

Shareholders' Equity

Shareholders' Equity	3 Months Ended
	Mar. 31, 2024
Stockholders' Equity Note [Abstract]
Shareholders' Equity [Text Block]	Shareholders' Equity On April 30, 2024, the Company declared a quarterly cash dividend of $0.55 per common share payable on or about May 30, 2024 to shareholders of record as of May 15, 2024. Dividends declared were $0.55 per share during the three months ended March 31, 2024 and $0.54 per share during the three months ended March 31, 2023. Accumulated Other Comprehensive Income (Loss) AOCI includes unrealized gains and losses on AFS securities. AOCI also includes unrealized losses on AFS securities that were transferred from AFS to investment securities in the second quarter of 2022. Such amounts are being amortized over the estimated remaining life of the security as an adjustment to yield, offsetting the related amortization of premium on the transferred securities. 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 Investment Securities Transferred from AFS Total Balance, Dec. 31, 2022 $ (664,618) $ (172,337) (836,955) Net change in unrealized gain (loss) 124,045 — 124,045 Reclassification adjustments included in earnings: Interest revenue, Investment securities — 16,051 16,051 Other comprehensive income, before income taxes 124,045 16,051 140,096 Federal and state income taxes 28,179 3,516 31,695 Other comprehensive income, net of income taxes 95,866 12,535 108,401 Balance, March 31, 2023 $ (568,752) $ (159,802) $ (728,554) Balance, Dec. 31, 2023 $ (473,212) $ (125,888) $ (599,100) Net change in unrealized gain (loss) (71,806) — (71,806) Reclassification adjustments included in earnings: Interest revenue, Investment securities — 12,183 12,183 Loss on available for sale securities, net 45,171 — 45,171 Other comprehensive income (loss), before income taxes (26,635) 12,183 (14,452) Federal and state income taxes (6,289) 2,865 (3,424) Other comprehensive income (loss), net of income taxes (20,346) 9,318 (11,028) Balance, March 31, 2024 $ (493,558) $ (116,570) $ (610,128)

Earnings Per Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2024
Earnings Per Share [Abstract]
Earnings Per Share [Text Block]	Earnings Per Share (In thousands, except share and per share amounts) Three Months Ended March 31, 2024 2023 Numerator: Net income attributable to BOK Financial Corp. shareholders $ 83,703 $ 162,368 Less: Earnings allocated to participating securities 676 1,255 Numerator for basic earnings per share – income available to common shareholders 83,027 161,113 Effect of reallocating undistributed earnings of participating securities — — Numerator for diluted earnings per share – income available to common shareholders $ 83,027 $ 161,113 Denominator: Weighted average shares outstanding 64,812,555 66,849,288 Less: Participating securities included in weighted average shares outstanding 522,450 517,513 Denominator for basic earnings per common share 64,290,105 66,331,775 Dilutive effect of employee stock compensation plans — — Denominator for diluted earnings per common share 64,290,105 66,331,775 Basic earnings per share $ 1.29 $ 2.43 Diluted earnings per share $ 1.29 $ 2.43

Reportable Segments

Reportable Segments	3 Months Ended
	Mar. 31, 2024
Segment Reporting [Abstract]
Reportable Segments [Text Block]	Reportable Segments Reportable segments reconciliation to the Consolidated Financial Statements for the three months ended March 31, 2024 is as follows (in thousands): Commercial Consumer Wealth Funds Management and Other BOK Net interest revenue from external sources $ 282,447 $ 7,350 $ 6,999 $ (3,224) $ 293,572 Net interest revenue (expense) from internal sources (37,326) 94,799 33,110 (90,583) — Net interest revenue 245,121 102,149 40,109 (93,807) 293,572 Net loans charged off and provision for credit losses 4,160 1,808 (15) 2,047 8,000 Net interest revenue after provision for credit losses 240,961 100,341 40,124 (95,854) 285,572 Other operating revenue 50,006 36,207 118,704 (43,216) 161,701 Other operating expense 70,095 53,447 99,535 117,307 340,384 Net direct contribution 220,872 83,101 59,293 (256,377) 106,889 Gain (loss) on financial instruments, net 167 (9,663) — 9,496 — Change in fair value of mortgage servicing rights — 10,977 — (10,977) — Gain (loss) on repossessed assets, net — 107 — (107) — Corporate expense allocations 18,397 14,172 14,558 (47,127) — Net income before taxes 202,642 70,350 44,735 (210,838) 106,889 Federal and state income taxes 49,392 16,546 10,570 (53,313) 23,195 Net income 153,250 53,804 34,165 (157,525) 83,694 Net income attributable to non-controlling interests — — — (9) (9) Net income attributable to BOK Financial Corp. shareholders $ 153,250 $ 53,804 $ 34,165 $ (157,516) $ 83,703 Average assets $ 29,806,817 $ 9,391,981 $ 15,759,328 $ (4,930,554) $ 50,027,572 Reportable segments reconciliation to the Consolidated Financial Statements for the three months ended March 31, 2023 is as follows (in thousands): Commercial Consumer Wealth Funds Management and Other BOK Net interest revenue from external sources $ 287,988 $ 21,146 $ 20,940 $ 22,274 $ 352,348 Net interest revenue (expense) from internal sources (3,932) 88,235 33,166 (117,469) — Net interest revenue 284,056 109,381 54,106 (95,195) 352,348 Net loans charged off and provision for credit losses 76 1,184 (24) 14,764 16,000 Net interest revenue after provision for credit losses 283,980 108,197 54,130 (109,959) 336,348 Other operating revenue 56,845 30,610 108,911 (18,501) 177,865 Other operating expense 73,134 50,198 82,039 100,441 305,812 Net direct contribution 267,691 88,609 81,002 (228,901) 208,401 Gain (loss) on financial instruments, net (58) (4,673) — 4,731 — Change in fair value of mortgage servicing rights — (6,059) — 6,059 — Gain (loss) on repossessed assets, net 859 14 — (873) — Corporate expense allocations 17,718 11,622 12,360 (41,700) — Net income before taxes 250,774 66,269 68,642 (177,284) 208,401 Federal and state income taxes 60,543 15,586 16,195 (46,419) 45,905 Net income 190,231 50,683 52,447 (130,865) 162,496 Net loss attributable to non-controlling interests — — — 128 128 Net income attributable to BOK Financial Corp. shareholders $ 190,231 $ 50,683 $ 52,447 $ (130,993) $ 162,368 Average assets $ 28,162,934 $ 9,934,511 $ 11,663,096 $ (3,778,073) $ 45,982,468

Fees and Commissions Revenue Fe

Fees and Commissions Revenue Fees and Commissions Revenue	3 Months Ended
	Mar. 31, 2024
Revenue from Contract with Customer [Abstract]
Fees and Commissions Revenue [Text Block]	Fees and Commissions 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 and investment banking. 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 represents 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 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 charge 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. Mortgage banking revenue includes revenues recognized in conjunction with the origination, marketing and servicing of conventional and government-sponsored residential mortgage loans. Mortgage production revenue includes net realized gains (losses) on sales of residential mortgage loans in the secondary market and the net change in unrealized gains (losses) on residential mortgage loans held for sale. Mortgage production revenue also includes changes in the fair value of derivative contracts not designated as hedging instruments related to residential mortgage loan commitments and forward sales contracts. Mortgage servicing revenue includes servicing fee income and late charges on loans serviced for others. Fees and commissions revenue by reportable segment and primary service line is as follows for the three months ended March 31, 2024 (in thousands): Commercial Consumer Wealth Management Funds Management & Other Consolidated Out of Scope 1 In Scope 2 Trading revenue $ — $ — $ 37,457 $ — $ 37,457 $ 37,457 $ — Customer hedging revenue 3,743 — 2,020 562 6,325 6,325 — Retail brokerage revenue — — 4,693 — 4,693 — 4,693 Investment banking revenue 3,819 — 6,885 — 10,704 3,094 7,610 Brokerage and trading revenue 7,562 — 51,055 562 59,179 46,876 12,303 TransFund EFT network revenue 20,466 826 (18) — 21,274 — 21,274 Merchant services revenue 2,180 9 — — 2,189 — 2,189 Corporate card revenue 1,738 — 179 113 2,030 — 2,030 Transaction card revenue 24,384 835 161 113 25,493 — 25,493 Personal trust revenue — — 24,345 — 24,345 — 24,345 Corporate trust revenue — — 9,260 — 9,260 — 9,260 Institutional trust & retirement plan services revenue — — 16,148 — 16,148 — 16,148 Investment management services and other revenue — — 5,552 — 5,552 — 5,552 Fiduciary and asset management revenue — — 55,305 — 55,305 — 55,305 Commercial account service charge revenue 14,900 531 546 — 15,977 — 15,977 Overdraft fee revenue 36 5,394 30 — 5,460 — 5,460 Check card revenue — 5,670 — — 5,670 — 5,670 Automated service charge and other deposit fee revenue 269 1,236 73 — 1,578 — 1,578 Deposit service charges and fees 15,205 12,831 649 — 28,685 — 28,685 Mortgage production revenue — 3,525 — — 3,525 3,525 — Mortgage servicing revenue — 16,115 — (673) 15,442 15,442 — Mortgage banking revenue — 19,640 — (673) 18,967 18,967 — Other revenue 3,479 2,901 11,534 (4,979) 12,935 7,912 5,023 Total fees and commissions revenue $ 50,630 $ 36,207 $ 118,704 $ (4,977) $ 200,564 $ 73,755 $ 126,809 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 three months ended March 31, 2023 (in thousands): Commercial Consumer Wealth Management Funds Management & Other Consolidated Out of Scope 1 In Scope 2 Trading revenue $ — $ — $ 27,598 $ — $ 27,598 $ 27,598 $ — Customer hedging revenue 6,487 — 100 1,767 8,354 8,354 — Retail brokerage revenue — — 3,844 — 3,844 — 3,844 Insurance brokerage revenue — — 3,306 — 3,306 — 3,306 Investment banking revenue 3,698 — 5,596 — 9,294 3,598 5,696 Brokerage and trading revenue 10,185 — 40,444 1,767 52,396 39,550 12,846 TransFund EFT network revenue 20,499 908 (17) 2 21,392 — 21,392 Merchant services revenue 2,150 8 — — 2,158 — 2,158 Corporate card revenue 1,785 — 177 109 2,071 — 2,071 Transaction card revenue 24,434 916 160 111 25,621 — 25,621 Personal trust revenue — — 23,527 — 23,527 — 23,527 Corporate trust revenue — — 7,660 — 7,660 — 7,660 Institutional trust & retirement plan services revenue — — 13,253 — 13,253 — 13,253 Investment management services and other revenue — — 6,238 (21) 6,217 — 6,217 Fiduciary and asset management revenue — — 50,678 (21) 50,657 — 50,657 Commercial account service charge revenue 12,871 499 477 — 13,847 — 13,847 Overdraft fee revenue 25 4,828 20 — 4,873 — 4,873 Check card revenue — 5,638 — 1 5,639 — 5,639 Automated service charge and other deposit fee revenue 237 1,313 59 — 1,609 — 1,609 Deposit service charges and fees 13,133 12,278 556 1 25,968 — 25,968 Mortgage production revenue — (633) — — (633) (633) — Mortgage servicing revenue — 15,558 — (558) 15,000 15,000 — Mortgage banking revenue — 14,925 — (558) 14,367 14,367 — Other revenue 8,083 2,462 17,073 (10,648) 16,970 8,560 8,410 Total fees and commissions revenue $ 55,835 $ 30,581 $ 108,911 $ (9,348) $ 185,979 $ 62,477 $ 123,502 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	3 Months Ended
	Mar. 31, 2024
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 three months ended March 31, 2024 and 2023, respectively. Transfers between significant other observable inputs and significant unobservable inputs during the three months ended March 31, 2024 and 2023 were immaterial. 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 March 31, 2024 or December 31, 2023. Assets and Liabilities Measured at Fair Value on a Recurring Basis The fair value of financial assets and liabilities measured on a recurring basis was as follows as of March 31, 2024 (in thousands): Total Quoted Prices in Active Markets for Identical Instruments (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs Assets: Trading securities: U.S. government securities $ 426,825 $ 370,062 $ 56,763 $ — Residential agency mortgage-backed securities 4,898,485 — 4,898,485 — Municipal securities 67,120 — 67,120 — Other trading securities 48,608 — 48,608 — Total trading securities 5,441,038 370,062 5,070,976 — Available for sale securities: U.S. Treasury 920 920 — — Municipal securities 304,826 — 304,826 — Residential agency mortgage-backed securities 7,816,688 — 7,816,688 — Residential non-agency mortgage-backed securities 846,805 — 846,805 — Commercial agency mortgage-backed securities 3,683,376 — 3,683,376 — Other debt securities 473 — — 473 Total available for sale securities 12,653,088 920 12,651,695 473 Fair value option securities — Residential agency mortgage-backed securities 19,805 — 19,805 — Residential mortgage loans held for sale 1 75,449 — 68,285 7,164 Mortgage servicing rights 2 319,330 — — 319,330 Derivative contracts, net of cash collateral 3 263,493 10 263,483 — Liabilities: Derivative contracts, net of cash collateral 3 438,605 649 437,956 — 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 77.97% 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 5, Mortgage Banking Activities. 3 See Note 3 for detail of fair value of derivative contracts by contract type. Derivative contracts in asset and liability positions that were valued based on quoted prices in active markets for identical instruments (Level 1) are primarily exchange-traded interest rate derivative contracts held for trading purposes . The fair value of financial assets and liabilities measured on a recurring basis was as follows as of December 31, 2023 (in thousands): Total Quoted Prices in Active Markets for Identical Instruments (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs Assets: Trading securities: U.S. government securities $ 10,959 $ 9,017 $ 1,942 $ — Residential agency mortgage-backed securities 5,105,137 — 5,105,137 — Municipal securities 37,413 — 37,413 — Other trading securities 39,996 — 39,996 — Total trading securities 5,193,505 9,017 5,184,488 — Available for sale securities: U.S. Treasury 925 925 — — Municipal securities 502,833 — 502,833 — Residential agency mortgage-backed securities 6,834,720 — 6,834,720 — Residential non-agency mortgage-backed securities 799,877 — 799,877 — Commercial agency mortgage-backed securities 4,147,853 — 4,147,853 — Other debt securities 473 — — 473 Total available for sale securities 12,286,681 925 12,285,283 473 Fair value option securities — Residential agency mortgage-backed securities 20,671 — 20,671 — Residential mortgage loans held for sale 1 56,935 — 49,749 7,186 Mortgage servicing rights 2 293,884 — — 293,884 Derivative contracts, net of cash collateral 3 410,304 — 410,304 — Liabilities: Derivative contracts, net of cash collateral 3 587,473 2,607 584,866 — 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 77.74% 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 5, Mortgage Banking Activities. 3 See Note 3 for detail of fair value of derivative contracts by contract type. Derivative contracts in asset and liability positions that were valued based on quoted prices in active markets for identical instruments (Level 1) are primarily exchange-traded interest rate derivative contracts held for trading purposes. 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 Company has elected to carry all residential mortgage-backed securities guaranteed by U.S. government agencies held as economic hedges against changes in the fair value of mortgage servicing rights at fair value with changes in the fair value recognized in earnings. The fair value of certain available for sale 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 references 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 Corporate Treasury, Risk Management and Finance departments assesses 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, current fair value, probability of default and loss given default. 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 Company has elected to carry all residential mortgage loans originated for sale at fair value. Changes in the fair value of these financial instruments are recognized in earnings. The fair values of residential mortgage loans held for sale are based upon quoted market prices of such loans sold in securitization transactions, including related unfunded loan commitments and forward sales contracts. The fair value of mortgage loans that were unable to be sold to U.S. government agencies were 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 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) during the period. The carrying value represents only those assets with a balance at March 31, 2024 for which the fair value was adjusted during the three months ended March 31, 2024 (in thousands): Fair Value Adjustments for the Carrying Value at March 31, 2024 Three Months Ended Quoted Prices Significant Significant Gross charge-offs against allowance for loan losses Other gains (losses), net Nonaccruing loans $ — $ 67 $ 23,741 $ 4,935 $ — The following represents the carrying value of assets measured at fair value on a non-recurring basis (and related losses) during the period. The carrying value represents only those assets with a balance at March 31, 2023 for which the fair value was adjusted during the three months ended March 31, 2023 (in thousands): Fair Value Adjustments for the Carrying Value at March 31, 2023 Three Months Ended Quoted Prices Significant Significant Gross charge-offs against allowance for loan losses Other gains (losses), net Nonaccruing loans $ — $ — $ 14,040 $ 1,991 $ — Real estate and other repossessed assets — 547 — — (101) The fair value of collateral-dependent nonaccruing loans secured by real estate 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 the same or 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 March 31, 2024 follows (dollars in thousands): Fair Value Valuation Technique(s) Unobservable Input Range Nonaccruing loans $ 23,741 Discounted cash flows Management knowledge of industry and non-real estate collateral 17% - 96% (83%) 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 March 31, 2023 follows (dollars in thousands): Fair Value Valuation Technique(s) Unobservable Input Range Nonaccruing loans $ 14,040 Discounted cash flows Management knowledge of industry and non-real estate collateral including, but not limited to, recoverable oil and gas reserves, forward-looking commodity prices, estimated operating costs 88% - 88% (88%) 1 1 Represents fair value as a percentage of the unpaid principal balance. 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 are measured at fair value on a non-recurring basis as of March 31, 2024 (in thousands): Carrying Estimated Quoted Prices in Active Markets for Identical Instruments (Level 1) Significant Other Observable Inputs Significant Unobservable Inputs Cash and due from banks $ 801,677 $ 801,677 $ 801,677 $ — $ — Interest-bearing cash and cash equivalents 354,070 354,070 354,070 — — Trading securities: U.S. government securities 426,825 426,825 370,062 56,763 — Residential agency mortgage-backed securities 4,898,485 4,898,485 — 4,898,485 — Municipal securities 67,120 67,120 — 67,120 — Other trading securities 48,608 48,608 — 48,608 — Total trading securities 5,441,038 5,441,038 370,062 5,070,976 — Investment securities: Municipal securities 108,793 112,338 — 12,103 100,235 Residential agency mortgage-backed securities 2,044,972 1,858,027 — 1,858,027 — Commercial agency mortgage-backed securities 15,990 14,987 — 14,987 — Other debt securities 16,288 14,713 — 14,713 — Total investment securities 2,186,043 2,000,065 — 1,899,830 100,235 Allowance for credit losses (299) — — — — Investment securities, net of allowance 2,185,744 2,000,065 — 1,899,830 100,235 Available for sale securities: U.S. Treasury 920 920 920 — — Municipal securities 304,826 304,826 — 304,826 — Residential agency mortgage-backed securities 7,816,688 7,816,688 — 7,816,688 — Residential non-agency mortgage-backed securities 846,805 846,805 — 846,805 — Commercial agency mortgage-backed securities 3,683,376 3,683,376 — 3,683,376 — Other debt securities 473 473 — — 473 Total available for sale securities 12,653,088 12,653,088 920 12,651,695 473 Fair value option securities — Residential agency mortgage-backed securities 19,805 19,805 — 19,805 — Residential mortgage loans held for sale 75,449 75,449 — 68,285 7,164 Loans: Commercial 15,132,867 15,055,904 — — 15,055,904 Commercial real estate 5,236,677 5,143,304 — — 5,143,304 Loans to individuals 3,803,016 3,675,612 — — 3,675,612 Total loans 24,172,560 23,874,820 — — 23,874,820 Allowance for loan losses (281,623) — — — — Loans, net of allowance 23,890,937 23,874,820 — — 23,874,820 Mortgage servicing rights 319,330 319,330 — — 319,330 Derivative instruments with positive fair value, net of cash collateral 263,493 263,493 10 263,483 — Deposits with no stated maturity 32,016,638 32,016,638 — — 32,016,638 Time deposits 3,366,909 3,346,163 — — 3,346,163 Other borrowed funds 7,986,169 7,986,169 — — 7,986,169 Subordinated debentures 131,154 118,875 — 118,875 — Derivative instruments with negative fair value, net of cash collateral 438,605 438,605 649 437,956 — 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 are measured at fair value on a non-recurring basis as of December 31, 2023 (in thousands): Carrying Estimated Quoted Prices in Active Markets for Identical Instruments (Level 1) Significant Other Observable Inputs Significant Unobservable Inputs Cash and due from banks $ 947,613 $ 947,613 $ 947,613 $ — $ — Interest-bearing cash and cash equivalents 400,652 400,652 400,652 — — Trading securities: U.S. government securities 10,959 10,959 9,017 1,942 — Residential agency mortgage-backed securities 5,105,137 5,105,137 — 5,105,137 — Municipal securities 37,413 37,413 — 37,413 — Other trading securities 39,996 39,996 — 39,996 — Total trading securities 5,193,505 5,193,505 9,017 5,184,488 — Investment securities: Municipal securities 120,705 125,525 — 12,305 113,220 Residential agency mortgage-backed securities 2,092,083 1,917,810 — 1,917,810 — Commercial agency mortgage-backed securities 15,914 15,067 — 15,067 — Other debt securities 15,787 14,184 — 14,184 — Total investment securities 2,244,489 2,072,586 — 1,959,366 113,220 Allowance for credit losses (336) — — — — Investment securities, net of allowance 2,244,153 2,072,586 — 1,959,366 113,220 Available for sale securities: U.S. Treasury 925 925 925 — — Municipal securities 502,833 502,833 — 502,833 — Residential agency mortgage-backed securities 6,834,720 6,834,720 — 6,834,720 — Residential non-agency mortgage-backed securities 799,877 799,877 — 799,877 — Commercial agency mortgage-backed securities 4,147,853 4,147,853 — 4,147,853 — Other debt securities 473 473 — — 473 Total available for sale securities 12,286,681 12,286,681 925 12,285,283 473 Fair value option securities — Residential agency mortgage-backed securities 20,671 20,671 — 20,671 — Residential mortgage loans held for sale 56,935 56,935 — 49,749 7,186 Loans: Commercial 14,803,769 14,862,873 — — 14,862,873 Commercial real estate 5,337,647 5,270,657 — — 5,270,657 Loans to individuals 3,763,552 3,634,855 — — 3,634,855 Total loans 23,904,968 23,768,385 — — 23,768,385 Allowance for loan losses (277,123) — — — — Loans, net of allowance 23,627,845 23,768,385 — — 23,768,385 Mortgage servicing rights 293,884 293,884 — — 293,884 Derivative instruments with positive fair value, net of cash collateral 410,304 410,304 — 410,304 — Deposits with no stated maturity 31,007,679 31,007,679 — — 31,007,679 Time deposits 3,012,022 2,993,685 — — 2,993,685 Other borrowed funds 8,824,300 8,824,299 — — 8,824,299 Subordinated debentures 131,150 115,798 — 115,798 — Derivative instruments with negative fair value, net of cash collateral 587,473 587,473 2,607 584,866 — 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.

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2024
Subsequent Events [Abstract]
Subsequent Events [Text Block]	Subsequent Events See Footnote 6, Commitments and Contingent Liabilities, regarding the Exchange Offer. The Company evaluated events from the date of the consolidated financial statements on March 31, 2024 through the issuance of those consolidated financial statements included in this Quarterly Report on Form 10-Q. Except as noted above, no other events were identified requiring recognition in and/or disclosure in the consolidated financial statements.

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Pay vs Performance Disclosure
Net Income (Loss) Attributable to Parent	$ 83,703	$ 162,368

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Mar. 31, 2024
Trading Arrangements, by Individual
Material Terms of Trading Arrangement	No Company director or officer (as defined in Exchange Act Rule 16a-1(f)) has adopted, modified or terminated any trading arrangements during the first quarter of 2024. Certain of our officers or directors have made elections to participate in, and are participating in, our dividend reinvestment plan and 401(k) plan, and have made, and may from time to time make, elections to have shares withheld to cover withholding taxes on issuances of shares to such officers or directors, which may be designed to satisfy the affirmative defense conditions of Rule 10b5-1 under the Exchange Act or may constitute non-Rule 10b5-1 trading arrangements (as defined in Item 408(c) of Regulation S-K).
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2024
Accounting Policies [Abstract]
Basis of Accounting, Policy [Policy Text Block]	The accompanying unaudited consolidated financial statements of BOK Financial have been prepared in accordance with accounting principles for interim financial information generally accepted in the United States and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included.
Principles of Consolidation [Policy Text Block]	The unaudited consolidated financial statements include accounts of BOK Financial and its subsidiaries, principally BOKF, NA, BOK Financial Securities, Inc., and BOK Financial Private Wealth, Inc. Operating divisions of the Bank include Bank of Albuquerque, Bank of Oklahoma, Bank of Texas, BOK Financial in Arizona, Arkansas, Colorado and Kansas/Missouri, BOK Financial Mortgage and the TransFund electronic funds network.
Reclassification, Policy [Policy Text Block]	Certain reclassifications have been made to conform to the current period presentation.
Newly Adopted and Pending Accounting Policies [Policy Text Block]	Newly Adopted and Pending Accounting Policies Financial Accounting Standards Board FASB ASU 2023-01, Leases (Topic 842): Common Control Arrangements On March 27, 2023, the FASB issued ASU 2023-01 which, in part, amends the accounting for leasehold improvement in common-control arrangements. Under previous guidance, a lessee is generally required to amortize leasehold improvements that it owns over the shorter of the useful life of those improvements or the lease term. However, due to the nature of leasehold improvements made under leases between entities under common control, ASU 2023-01 requires a lessee in a common-control arrangement to amortize such leasehold improvements that it owns over the improvements' useful life to the common control group, regardless of the lease term. ASU 2023-01 is effective for fiscal years beginning after December 15, 2023, including interim periods within those fiscal years. Adoption of ASU 2023-01 did not have a material impact on the Company's financial statements. FASB ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures The FASB issued ASU 2023-07 on November 27, 2023 which is intended to improve reportable segment disclosure requirements. Under previous guidance, while entities were required to disclose segment revenue and measure of profit or loss, there has been limited disclosure around the reporting of segment expenses. In addition to enhanced disclosures about significant segment expenses, the amendments enhance interim disclosure requirements, clarify circumstances in which an entity can disclose multiple segment measures of profit or loss, provide new segment disclosure requirements for entities with a single reportable segment, and contain other disclosure requirements. The purpose of the amendments is to enable investors to better understand an entity’s overall performance and assess potential future cash flows. ASU 2023-07 is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. The Company is evaluating the requirements of the expanded segment disclosures but does not expect the additional disclosures to have a material impact on the reported segment information. FASB ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures The FASB issued ASU 2023-09 on December 14, 2023 which amends income tax disclosures to provide information to better assess how an entity’s operations and related tax risks and tax planning and operational opportunities affect its tax rate and prospects for future cash flows. The new guidance requires the entity to disclose specific categories in the rate reconciliation and provide additional information for reconciling items that meet a quantitative threshold. ASU 2023-09 is effective for annual periods beginning after December 15, 2024. The Company is currently assessing the impact ASU 2023-09 will have on its income tax disclosures. FASB ASU 2024-01, Compensation—Stock Compensation (Topic 718): Scope Application of Profits Interest and Similar Awards The FASB issued ASU 2024-01 on March 21, 2024 which provides illustrative guidance to help entities determine whether profits interest and similar awards should be accounted for as share-based payment arrangements within the scope of Topic 718, Compensation—Stock Compensation . The ASU is effective for annual periods beginning after December 15, 2024, including interim periods within those periods. Adoption of ASU 2024-01 is not expected to have a material impact on the Company's financial statements.
Derivatives, Policy [Policy Text Block]	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 reported in earnings as they occur. Credit risk is also considered in determining fair value. Deterioration in the credit rating of customer or other counterparties reduce 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 arrangements 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 type by counterparty basis. Derivative contracts may 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. None of these derivative contracts have been designated as hedging instruments for accounting purposes. Customer Risk Management Programs BOK Financial offers programs to 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 borrowers 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 the risk of 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. Trading BOK Financial may offer derivative instruments such as to-be-announced 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 in the Consolidated Statements of Earnings. Internal Risk Management Programs BOK Financial may use derivative contracts in managing its interest rate sensitivity, as part of its economic hedge of the change 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 the 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.
Loans and Allowances for Credit Losses, 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 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 principal amount outstanding. 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 more than 90 days 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. Accrued but not paid interest receivable is included in Receivables in the Consolidated Balance Sheets. Payments 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. Modifications of loans to existing borrowers generally consist of interest rate reductions, extension of payment terms, or a combination of these. Modifications may arise either voluntarily through negotiations with the borrower or involuntarily through court order. Payment deferrals up to six months are generally considered to be short-term modifications. Generally, principal and accrued but unpaid interest are not voluntarily forgiven. A change to the allowance for credit losses is generally not recorded upon modification because the effect of most modifications made to borrowers experiencing financial difficulty is already included in the allowance methodology. Performing loans may be renewed under the current collateral value, debt service ratio and other underwriting standards. Nonaccruing loans may 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 Other gains (losses), net in the Consolidated Statements of Earnings. 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 modification. The charge-off amount is determined through a quarterly evaluation of available cash resources and collateral values. 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 may have 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. 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 the expected cash flows discounted at the original note rate plus a liquidity spread. Guaranteed loans may be modified in accordance with U.S. government agency guidelines. Interest continues to accrue based on 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 and Allowances for Credit Losses, Allowances for Credit Losses [Policy Text Block]	Allowances for Credit Losses and Accrual for Off-balance Sheet Credit Risk from Unfunded Loans Commitments 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 ongoing 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, for real property held as collateral for loans, 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% 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 a 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 cancelable 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.
Revenue [Policy Text Block]	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 and investment banking. 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 represents 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 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 charge 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.

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities (Policies)	3 Months Ended
	Mar. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives, Policy [Policy Text Block]	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 reported in earnings as they occur. Credit risk is also considered in determining fair value. Deterioration in the credit rating of customer or other counterparties reduce 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 arrangements 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 type by counterparty basis. Derivative contracts may 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. None of these derivative contracts have been designated as hedging instruments for accounting purposes. Customer Risk Management Programs BOK Financial offers programs to 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 borrowers 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 the risk of 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. Trading BOK Financial may offer derivative instruments such as to-be-announced 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 in the Consolidated Statements of Earnings. Internal Risk Management Programs BOK Financial may use derivative contracts in managing its interest rate sensitivity, as part of its economic hedge of the change 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 the 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.

Securities (Tables)

Securities (Tables)	3 Months Ended
	Mar. 31, 2024
Marketable Securities [Abstract]
Trading Securities, [Table Text Block]	The fair value and net unrealized gain (loss) included in trading securities are as follows (in thousands): March 31, 2024 December 31, 2023 Fair Value Net Unrealized Gain (Loss) Fair Value Net Unrealized Gain (Loss) U.S. government securities $ 426,825 $ (194) $ 10,959 $ 28 Residential agency mortgage-backed securities 4,898,485 8,571 5,105,137 98,124 Municipal securities 67,120 (142) 37,413 323 Other trading securities 48,608 127 39,996 160 Total trading securities $ 5,441,038 $ 8,362 $ 5,193,505 $ 98,635
Investment Securities (Held-to-Maturity) [Table Text Block]	The amortized cost and fair values of investment securities are as follows (in thousands): March 31, 2024 Amortized Carrying Fair Gross Unrealized Cost Value 1 Value Gain Loss Municipal securities $ 108,793 $ 108,793 $ 112,338 $ 3,828 $ (283) Mortgage-backed securities: Residential agency 2,196,121 2,044,972 1,858,027 99 (187,044) Commercial agency 17,258 15,990 14,987 — (1,003) Other debt securities 16,288 16,288 14,713 — (1,575) Total investment securities 2,338,460 2,186,043 2,000,065 3,927 (189,905) Allowance for credit losses (299) (299) — — — Investment securities, net of allowance $ 2,338,161 $ 2,185,744 $ 2,000,065 $ 3,927 $ (189,905) 1 Carrying value includes $152 million of net unrealized loss which remains in AOCI in the Consolidated Balance Sheets related to certain securities transferred during the second quarter of 2022 from the Available for Sale securities portfolio to the Investment securities portfolio. December 31, 2023 Amortized Carrying Fair Gross Unrealized Cost Value 1 Value Gain Loss Municipal securities $ 120,705 $ 120,705 $ 125,525 $ 5,014 $ (194) Mortgage-backed securities: Residential agency 2,255,340 2,092,083 1,917,810 125 (174,398) Commercial agency 17,258 15,914 15,067 — (847) Other debt securities 15,787 15,787 14,184 — (1,603) Total investment securities 2,409,090 2,244,489 2,072,586 5,139 (177,042) Allowance for credit losses (336) (336) — — — Investment securities, net of allowance $ 2,408,754 $ 2,244,153 $ 2,072,586 $ 5,139 $ (177,042) 1 Carrying value includes $165 million of net unrealized loss which remains in AOCI in the Consolidated Balance Sheets related to certain securities transferred during the second quarter of 2022 from the Available for Sale securities portfolio to the Investment securities portfolio. The amortized cost and fair values of investment securities at March 31, 2024, 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: Carrying value $ 19,248 $ 95,707 $ 26,103 $ 13 $ 141,071 3.27 Fair value 19,468 98,033 24,524 13 142,038 Residential mortgage-backed securities: Carrying value $ 2,044,972 2 Fair value 1,858,027 Total investment securities: Carrying value $ 2,186,043 Fair value 2,000,065 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 4.9 years based upon current prepayment assumptions. Temporarily Impaired Investment Securities (dollars in thousands): March 31, 2024 Number of Securities Less Than 12 Months 12 Months or Longer Total Fair Unrealized Fair Unrealized Fair Unrealized Investment: Municipal securities 20 $ 17,310 $ 81 $ 6,587 $ 202 $ 23,897 $ 283 Mortgage-backed securities: Residential agency 116 — — 1,857,000 187,044 1,857,000 187,044 Commercial agency 2 — — 14,987 1,003 14,987 1,003 Other debt securities 3 — — 8,700 1,575 8,700 1,575 Total investment securities 141 $ 17,310 $ 81 $ 1,887,274 $ 189,824 $ 1,904,584 $ 189,905 December 31, 2023 Number of Securities Less Than 12 Months 12 Months or Longer Total Fair Unrealized Fair Unrealized Fair Unrealized Investment: Municipal securities 13 $ 1,931 $ 5 $ 6,600 $ 189 $ 8,531 $ 194 Mortgage-backed securities: Residential agency 116 — — 1,916,732 174,398 1,916,732 174,398 Commercial agency 2 — — 15,067 847 15,067 847 Other debt securities 3 — — 8,672 1,603 8,672 1,603 Total investment securities 134 $ 1,931 $ 5 $ 1,947,071 $ 177,037 $ 1,949,002 $ 177,042
Available For Sale Securities [Table Text Block]	The amortized cost and fair value of available for sale securities are as follows (in thousands): March 31, 2024 Amortized Fair Gross Unrealized Cost Value Gain Loss U.S. Treasury $ 1,000 $ 920 $ — $ (80) Municipal securities 329,216 304,826 — (24,390) Mortgage-backed securities: Residential agency 8,095,352 7,816,688 20,132 (298,796) Residential non-agency 885,059 846,805 11,106 (49,360) Commercial agency 3,985,220 3,683,376 1,197 (303,041) Other debt securities 500 473 — (27) Total available for sale securities $ 13,296,347 $ 12,653,088 $ 32,435 $ (675,694) December 31, 2023 Amortized Fair Gross Unrealized Cost Value Gain Loss U.S. Treasury $ 1,000 $ 925 $ — $ (75) Municipal securities 544,707 502,833 1 (41,875) Mortgage-backed securities: Residential agency 7,066,645 6,834,720 36,983 (268,908) Residential non-agency 833,535 799,877 12,865 (46,523) Commercial agency 4,456,918 4,147,853 2,972 (312,037) Other debt securities 500 473 — (27) Total available for sale securities $ 12,903,305 $ 12,286,681 $ 52,821 $ (669,445) The amortized cost and fair values of available for sale securities at March 31, 2024, 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 $ 473,589 $ 2,480,160 $ 915,033 $ 447,154 $ 4,315,936 5.19 Fair value 468,688 2,254,408 841,253 425,246 3,989,595 Residential mortgage-backed securities: Amortized cost $ 8,980,411 2 Fair value 8,663,493 Total available for sale securities: Amortized cost $ 13,296,347 Fair value 12,653,088 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 4.2 years based upon current prepayment assumptions. Sales of available for sale securities resulted in gains and losses as follows (in thousands): Three Months Ended 2024 2023 Proceeds $ 735,994 $ — Gross realized gains 233 — Gross realized losses (45,404) — Related federal and state income tax benefit (10,624) —
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table Text Block]	March 31, 2024 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 $ — $ — $ 920 $ 80 $ 920 $ 80 Municipal securities 135 3,139 30 298,162 24,360 301,301 24,390 Mortgage-backed securities: Residential agency 711 2,179,355 10,501 3,502,950 288,296 5,682,306 298,797 Residential non-agency 38 138,197 530 532,619 48,829 670,815 49,359 Commercial agency 245 241,331 2,625 3,148,535 300,416 3,389,866 303,041 Other debt securities 1 — — 473 27 473 27 Total available for sale securities 1,131 $ 2,562,022 $ 13,686 $ 7,483,659 $ 662,008 $ 10,045,681 $ 675,694 December 31, 2023 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 $ — $ — $ 925 $ 75 $ 925 $ 75 Municipal securities 190 6,799 410 494,955 41,465 501,754 41,875 Mortgage-backed securities: Residential agency 630 690,118 3,689 3,717,975 265,219 4,408,093 268,908 Residential non-agency 32 116,077 1,244 451,370 45,279 567,447 46,523 Commercial agency 269 392,828 2,626 3,421,757 309,411 3,814,585 312,037 Other debt securities 1 — — 473 27 473 27 Total available for sale securities 1,123 $ 1,205,822 $ 7,969 $ 8,087,455 $ 661,476 $ 9,293,277 $ 669,445
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): March 31, 2024 December 31, 2023 Fair Value Net Unrealized Gain (Loss) Fair Value Net Unrealized Gain (Loss) Residential agency mortgage-backed securities $ 19,805 $ (1,711) $ 20,671 $ (1,406)

Derivatives (Tables)

Derivatives (Tables)	3 Months Ended
	Mar. 31, 2024
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 March 31, 2024 (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 $ 3,075,103 $ 118,237 $ (3,844) $ 114,393 $ (111,283) $ 3,110 Energy contracts 7,266,492 754,565 (461,295) 293,270 (117,521) 175,749 Foreign exchange contracts 56,590 55,687 — 55,687 (842) 54,845 Equity option contracts 1,859 61 — 61 (50) 11 Total customer risk management programs 10,400,044 928,550 (465,139) 463,411 (229,696) 233,715 Trading 19,616,813 67,692 (40,165) 27,527 (44) 27,483 Internal risk management programs 455,912 3,608 (1,313) 2,295 — 2,295 Total derivative contracts $ 30,472,769 $ 999,850 $ (506,617) $ 493,233 $ (229,740) $ 263,493 Liabilities 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 $ 3,065,103 $ 116,796 $ (3,844) $ 112,952 $ — $ 112,952 Energy contracts 7,720,466 753,145 (461,295) 291,850 (29,444) 262,406 Foreign exchange contracts 56,254 55,161 — 55,161 — 55,161 Equity option contracts 1,859 61 — 61 — 61 Total customer risk management programs 10,843,682 925,163 (465,139) 460,024 (29,444) 430,580 Trading 23,751,156 93,502 (40,165) 53,337 (46,563) 6,774 Internal risk management programs 38,617 2,564 (1,313) 1,251 — 1,251 Total derivative contracts $ 34,633,455 $ 1,021,229 $ (506,617) $ 514,612 $ (76,007) $ 438,605 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, 2023 (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 $ 2,754,476 $ 108,450 $ (6,810) $ 101,640 $ (94,608) $ 7,032 Energy contracts 7,846,190 836,425 (399,148) 437,277 (169,141) 268,136 Foreign exchange contracts 54,999 53,863 — 53,863 (872) 52,991 Equity option contracts 3,316 54 — 54 (44) 10 Total customer risk management programs 10,658,981 998,792 (405,958) 592,834 (264,665) 328,169 Trading 16,264,818 118,545 (37,111) 81,434 (6,996) 74,438 Internal risk management programs 425,014 7,697 — 7,697 — 7,697 Total derivative contracts $ 27,348,813 $ 1,125,034 $ (443,069) $ 681,965 $ (271,661) $ 410,304 Liabilities 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 $ 2,754,476 $ 108,402 $ (6,810) $ 101,592 $ — $ 101,592 Energy contracts 8,254,004 831,467 (399,148) 432,319 (6,441) 425,878 Foreign exchange contracts 54,405 53,065 — 53,065 — 53,065 Equity option contracts 3,316 54 — 54 — 54 Total customer risk management programs 11,066,201 992,988 (405,958) 587,030 (6,441) 580,589 Trading 20,644,156 224,648 (37,111) 187,537 (181,917) 5,620 Internal risk management programs 2,244 1,264 — 1,264 — 1,264 Total derivative contracts $ 31,712,601 $ 1,218,900 $ (443,069) $ 775,831 $ (188,358) $ 587,473 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 income statement (in thousands): Three Months Ended March 31, 2024 March 31, 2023 Brokerage Gain (Loss) on Derivatives, Net Brokerage Gain (Loss) on Derivatives, Net Customer risk management programs: Interest rate contracts $ 2,460 $ — $ 1,770 $ — Energy contracts 3,815 — 6,553 — Foreign exchange contracts 50 — 31 — Equity option contracts — — — — Total customer risk management programs 6,325 — 8,354 — Trading 1 83,706 — (63,093) — Internal risk management programs — (8,633) — (1,344) Total derivative contracts $ 90,031 $ (8,633) $ (54,739) $ (1,344) 1 Represents changes in fair value of to-be-announced securities and other derivative instruments 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 Statements of Earnings.

Loans and Allowances for Cred_2

Loans and Allowances for Credit Losses (Tables)	3 Months Ended
	Mar. 31, 2024
Loans and Leases Receivable, Net Amount [Abstract]
Schedule of Loans by Portfolio Segment [Table Text Block]	Portfolio segments of the loan portfolio are as follows (in thousands): March 31, 2024 December 31, 2023 Fixed Variable Non-accrual Total Fixed Variable Non-accrual Total Commercial $ 3,597,543 $ 11,460,704 $ 74,620 $ 15,132,867 $ 3,558,563 $ 11,135,075 $ 110,131 $ 14,803,769 Commercial real estate 784,301 4,430,289 22,087 5,236,677 791,757 4,538,570 7,320 5,337,647 Loans to individuals 2,315,236 1,464,972 22,808 3,803,016 2,282,914 1,452,620 28,018 3,763,552 Total $ 6,697,080 $ 17,355,965 $ 119,515 $ 24,172,560 $ 6,633,234 $ 17,126,265 $ 145,469 $ 23,904,968
Rollforward of Allowance For Loan Losses And Accrual for Off-Balance 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 is summarized as follows (in thousands): Three Months Ended March 31, 2024 Commercial Commercial Real Estate Loans to Individuals Total Allowance for loan losses: Beginning balance $ 141,232 $ 94,718 $ 41,173 $ 277,123 Provision for loan losses 8,311 3,995 (2,346) 9,960 Loans charged off (4,240) (1,250) (1,570) (7,060) Recoveries of loans previously charged off 964 16 620 1,600 Ending balance $ 146,267 $ 97,479 $ 37,877 $ 281,623 Allowance for off-balance sheet credit risk from unfunded loan commitments: Beginning balance $ 19,762 $ 27,439 $ 1,776 $ 48,977 Provision for off-balance sheet credit risk (1,972) 426 (112) (1,658) Ending balance $ 17,790 $ 27,865 $ 1,664 $ 47,319 Three Months Ended March 31, 2023 Commercial Commercial Real Estate Loans to Individuals Total Allowance for loan losses: Beginning balance $ 131,586 $ 57,648 $ 46,470 $ 235,704 Provision for loan losses 6,330 10,426 (2,231) 14,525 Loans charged off (12) (2,208) (1,447) (3,667) Recoveries of loans previously charged off 1,994 137 767 2,898 Ending balance $ 139,898 $ 66,003 $ 43,559 $ 249,460 Allowance for off-balance sheet credit risk from unfunded loan commitments: Beginning balance $ 18,246 $ 40,490 $ 2,183 $ 60,919 Provision for off-balance sheet credit risk 2,362 (279) (59) 2,024 Ending balance $ 20,608 $ 40,211 $ 2,124 $ 62,943 An $8.0 million provision for credit losses was necessary for the first quarter of 2024, reflecting continued loan growth and a stable economic outlook. The allowance for loan losses and recorded investment of the related loans by portfolio segment for each measurement method at March 31, 2024 is as follows (in thousands): Collectively Measured Individually Measured Total Recorded Investment Related Allowance Recorded Investment Related Allowance Recorded Investment Related Commercial $ 15,058,247 $ 143,307 $ 74,620 $ 2,960 $ 15,132,867 $ 146,267 Commercial real estate 5,214,590 97,479 22,087 — 5,236,677 97,479 Loans to individuals 3,780,208 37,877 22,808 — 3,803,016 37,877 Total $ 24,053,045 $ 278,663 $ 119,515 $ 2,960 $ 24,172,560 $ 281,623 The allowance for loan losses and recorded investment of the related loans by portfolio segment for each measurement method at December 31, 2023 is as follows (in thousands): Collectively Measured Individually Measured Total Recorded Investment Related Allowance Recorded Investment Related Allowance Recorded Investment Related Commercial $ 14,693,638 $ 138,540 $ 110,131 $ 2,692 $ 14,803,769 $ 141,232 Commercial real estate 5,330,327 94,718 7,320 — 5,337,647 94,718 Loans to individuals 3,735,534 41,173 28,018 — 3,763,552 41,173 Total $ 23,759,499 $ 274,431 $ 145,469 $ 2,692 $ 23,904,968 $ 277,123
Schedule of Credit Quality Indicators [Table Text Block]	The following table summarizes the Company’s loan portfolio at March 31, 2024 by the risk grade categories and vintage (in thousands): Origination Year 2024 2023 2022 2021 2020 Prior Revolving Loans Revolving Loans Converted to Term Loans Total Commercial: Healthcare Pass $ 165,523 $ 638,346 $ 924,230 $ 573,778 $ 382,923 $ 1,095,684 $ 288,056 $ 14 $ 4,068,554 Special Mention — 15,000 — 1,254 — 20,027 855 — 37,136 Accruing Substandard — 1,492 429 18,397 58,753 10,896 975 — 90,942 Nonaccrual — — — — — 49,307 — — 49,307 Total healthcare 165,523 654,838 924,659 593,429 441,676 1,175,914 289,886 14 4,245,939 Loans charged off, year-to-date — — — — — 502 — — 502 Services Pass 183,565 786,684 514,841 380,227 219,684 725,856 677,588 534 3,488,979 Special Mention — — 1,042 1,305 1,321 9,243 31 — 12,942 Accruing Substandard — — 13,380 155 341 7,204 2,351 750 24,181 Nonaccrual — — — 1,487 349 — 1,483 — 3,319 Total services 183,565 786,684 529,263 383,174 221,695 742,303 681,453 1,284 3,529,421 Loans charged off, year-to-date — — — — — — — — — Energy Pass 58,061 141,197 90,222 13,033 7,447 20,635 3,067,570 — 3,398,165 Special Mention — — — — — — 13,950 — 13,950 Accruing Substandard — — — — — — 16,613 — 16,613 Nonaccrual — — — — — 89 14,902 — 14,991 Total energy 58,061 141,197 90,222 13,033 7,447 20,724 3,113,035 — 3,443,719 Loans charged off, year-to-date — — — — — — — — — General business Pass 285,096 845,326 383,429 215,106 134,121 378,163 1,569,156 1,945 3,812,342 Special Mention — 6,110 8,244 8,594 — 1,602 10,611 6 35,167 Accruing Substandard — 3,375 37,682 1,280 1,235 6,701 9,003 — 59,276 Nonaccrual — 994 101 — — 42 5,862 4 7,003 Total general business 285,096 855,805 429,456 224,980 135,356 386,508 1,594,632 1,955 3,913,788 Loans charged off, year-to-date — 27 1,399 — — 158 2,154 — 3,738 Total commercial 692,245 2,438,524 1,973,600 1,214,616 806,174 2,325,449 5,679,006 3,253 15,132,867 Commercial real estate: Pass 18,763 418,504 2,059,848 1,061,396 386,041 1,127,922 119,823 — 5,192,297 Special Mention — 440 — — — 16,527 — — 16,967 Accruing Substandard — — — — — 5,326 — — 5,326 Nonaccrual — 2,992 — — — 19,095 — — 22,087 Total commercial real estate 18,763 421,936 2,059,848 1,061,396 386,041 1,168,870 119,823 — 5,236,677 Loans charged off, year-to-date — — — — — 1,250 — — 1,250 Origination Year 2024 2023 2022 2021 2020 Prior Revolving Loans Revolving Loans Converted to Term Loans Total Loans to individuals: Residential mortgage Pass 96,002 405,724 319,050 336,878 343,246 284,962 367,761 21,386 2,175,009 Special Mention — 225 167 3 — 161 3,290 — 3,846 Accruing Substandard — — — — — — 279 1 280 Nonaccrual — 120 414 351 522 8,994 2,441 607 13,449 Total residential mortgage 96,002 406,069 319,631 337,232 343,768 294,117 373,771 21,994 2,192,584 Loans charged off, year-to-date — — — — — 2 5 — 7 Residential mortgage guaranteed by U.S. government agencies Pass — 361 3,012 2,204 3,806 120,856 — — 130,239 Nonaccrual — — — — 280 8,937 — — 9,217 Total residential mortgage guaranteed by U.S. government agencies — 361 3,012 2,204 4,086 129,793 — — 139,456 Personal: Pass 91,355 215,282 210,876 145,542 124,996 186,791 493,653 100 1,468,595 Special Mention — 28 13 51 13 3 — — 108 Accruing Substandard — — 24 — 1 144 1,962 — 2,131 Nonaccrual — 31 29 12 9 12 32 17 142 Total personal 91,355 215,341 210,942 145,605 125,019 186,950 495,647 117 1,470,976 Loans charged off, year-to-date 1 1,461 40 45 12 — — — 5 1,563 Total loans to individuals 187,357 621,771 533,585 485,041 472,873 610,860 869,418 22,111 3,803,016 Total loans $ 898,365 $ 3,482,231 $ 4,567,033 $ 2,761,053 $ 1,665,088 $ 4,105,179 $ 6,668,247 $ 25,364 $ 24,172,560 1 Includes charge-offs on deposit overdrafts, which are generally charged off at 60 days past due. The following table summarizes the Company's loan portfolio at December 31, 2023 by the risk grade categories and vintage (in thousands): Origination Year 2023 2022 2021 2020 2019 Prior Revolving Loans Revolving Loans Converted to Term Loans Total Commercial: Healthcare Pass 650,768 895,602 590,736 409,001 331,897 809,858 281,378 15 3,969,255 Special Mention — — — 21,791 — 31,235 5 — 53,031 Accruing Substandard — 2,128 18,508 6,911 — 10,896 975 — 39,418 Nonaccrual — — — 30,290 23,129 28,110 — — 81,529 Total healthcare 650,768 897,730 609,244 467,993 355,026 880,099 282,358 15 4,143,233 Loans charged off, year-to-date — — — — 2,500 — — — 2,500 Services Pass 900,090 526,776 401,872 228,818 106,112 643,477 730,729 595 3,538,469 Special Mention — 1,085 1,520 1,341 534 4,522 81 — 9,083 Accruing Substandard — 13,712 178 326 3,972 3,746 3,108 13 25,055 Nonaccrual — — 1,635 338 — — 1,643 — 3,616 Total services 900,090 541,573 405,205 230,823 110,618 651,745 735,561 608 3,576,223 Loans charged off, year-to-date — — 3,060 — — — 2,642 — 5,702 Energy Pass $ 190,122 $ 100,006 $ 43,769 $ 7,876 $ 9,562 $ 11,583 $ 3,025,590 $ — $ 3,388,508 Special Mention — — — — — — 13,950 — 13,950 Accruing Substandard — — — — — — 16,800 — 16,800 Nonaccrual — — — — — 99 17,744 — 17,843 Total energy 190,122 100,006 43,769 7,876 9,562 11,682 3,074,084 — 3,437,101 Loans charged off, year-to-date — — — — — — — — — General business Pass 942,468 436,832 224,735 138,951 101,100 287,744 1,389,128 2,164 3,523,122 Special Mention 10,264 16,167 8,420 1,253 321 8,295 897 — 45,617 Accruing Substandard 4,401 33,194 1,716 27 — — 31,992 — 71,330 Nonaccrual — 1,134 — — — 48 5,956 5 7,143 Total general business 957,133 487,327 234,871 140,231 101,421 296,087 1,427,973 2,169 3,647,212 Loans charged off, year-to-date — — 4,598 2 — 48 10 38 4,696 Total commercial 2,698,113 2,026,636 1,293,089 846,923 576,627 1,839,613 5,519,976 2,792 14,803,769 Commercial real estate: Pass 396,891 1,941,913 1,194,759 416,647 513,555 705,092 136,095 — 5,304,952 Special Mention — 476 — — — 19,171 — — 19,647 Accruing Substandard 2,992 — 3 — — 2,733 — — 5,728 Nonaccrual — — — — 7,170 150 — — 7,320 Total commercial real estate 399,883 1,942,389 1,194,762 416,647 520,725 727,146 136,095 — 5,337,647 Loans charged off, year-to-date — — — — — 8,446 — — 8,446 Origination Year 2023 2022 2021 2020 2019 Prior Revolving Loans Revolving Loans Converted to Term Loans Total Loans to individuals: Residential mortgage Pass 426,089 320,733 342,927 349,742 54,801 243,356 375,739 23,895 2,137,282 Special Mention 157 140 131 1,361 18 134 2,982 93 5,016 Accruing Substandard — 150 — — 37 49 50 — 286 Nonaccrual 79 1,419 237 544 344 12,381 2,387 665 18,056 Total residential mortgage 426,325 322,442 343,295 351,647 55,200 255,920 381,158 24,653 2,160,640 Loans charged off, year-to-date — — 51 4 — 17 — 1 73 Residential mortgage guaranteed by U.S. government agencies Pass 633 1,788 2,220 4,297 6,441 124,719 — — 140,098 Nonaccrual — — — 280 375 9,054 — — 9,709 Total residential mortgage guaranteed by U.S. government agencies 633 1,788 2,220 4,577 6,816 133,773 — — 149,807 Personal: Pass 218,401 229,580 149,291 136,215 75,348 137,629 503,841 145 1,450,450 Special Mention 66 39 106 30 8 — 1,918 3 2,170 Accruing Substandard — 64 12 9 144 — 3 — 232 Nonaccrual 4 51 9 16 3 12 158 — 253 Total personal 218,471 229,734 149,418 136,270 75,503 137,641 505,920 148 1,453,105 Loans charged off, year-to-date 1 5,636 82 96 43 — 10 6 26 5,899 Total loans to individuals 645,429 553,964 494,933 492,494 137,519 527,334 887,078 24,801 3,763,552 Total loans $ 3,743,425 $ 4,522,989 $ 2,982,784 $ 1,756,064 $ 1,234,871 $ 3,094,093 $ 6,543,149 $ 27,593 $ 23,904,968 1 Includes charge-offs on deposit overdrafts, which are generally charged off at 60 days past due.
Financing Receivable, Nonaccrual [Table Text Block]	A summary of nonaccruing loans at March 31, 2024 follows (in thousands): As of March 31, 2024 Total With No With Allowance Related Allowance Commercial: Healthcare $ 49,307 $ 9,668 $ 39,639 $ 2,100 Services 3,319 1,542 1,777 460 Energy 14,991 14,991 — — General business 7,003 6,362 641 400 Total commercial 74,620 32,563 42,057 2,960 Commercial real estate 22,087 22,087 — — Loans to individuals: Residential mortgage 13,449 13,449 — — Residential mortgage guaranteed by U.S. government agencies 9,217 9,217 — — Personal 142 142 — — Total loans to individuals 22,808 22,808 — — Total $ 119,515 $ 77,458 $ 42,057 $ 2,960 A summary of nonaccruing loans at December 31, 2023 follows (in thousands): As of December 31, 2023 Total With No With Allowance Related Allowance Commercial: Healthcare $ 81,529 $ 40,372 $ 41,157 $ 1,478 Services 3,616 1,684 1,932 1,214 Energy 17,843 17,843 — — General business 7,143 7,143 — — Total commercial 110,131 67,042 43,089 2,692 Commercial real estate 7,320 7,320 — — Loans to individuals: Residential mortgage 18,056 18,056 — — Residential mortgage guaranteed by U.S. government agencies 9,709 9,709 — — Personal 253 253 — — Total loans to individuals 28,018 28,018 — — Total $ 145,469 $ 102,380 $ 43,089 $ 2,692
Summary of Loans by Aging Status [Table Text Block]	A summary of loans currently performing and past due as of March 31, 2024 is as follows (in thousands): Past Due Past Due 90 Days or More and Accruing Current 30 to 59 60 to 89 Days 90 Days Total Commercial: Healthcare $ 4,206,313 $ — $ — $ 39,626 $ 4,245,939 $ — Services 3,528,567 485 20 349 3,529,421 — Energy 3,443,719 — — — 3,443,719 — General business 3,905,270 2,054 209 6,255 3,913,788 — Total commercial 15,083,869 2,539 229 46,230 15,132,867 — Commercial real estate 5,214,737 11,800 — 10,140 5,236,677 — Loans to individuals: Residential mortgage 2,183,027 7,139 737 1,681 2,192,584 — Residential mortgage guaranteed by U.S. government agencies 55,886 22,873 15,080 45,617 139,456 41,364 Personal 1,469,874 1,055 24 23 1,470,976 — Total loans to individuals 3,708,787 31,067 15,841 47,321 3,803,016 41,364 Total $ 24,007,393 $ 45,406 $ 16,070 $ 103,691 $ 24,172,560 $ 41,364 A summary of loans currently performing and past due as of December 31, 2023 is as follows (in thousands): Past Due Past Due 90 Days or More and Accruing Current 30 to 59 60 to 89 Days 90 Days Total Commercial: Healthcare $ 4,071,336 $ 18,019 $ 30,290 $ 23,588 $ 4,143,233 $ — Services 3,575,787 2 — 434 3,576,223 — Energy 3,437,101 — — — 3,437,101 — General business 3,639,775 412 1,157 5,868 3,647,212 — Total commercial 14,723,999 18,433 31,447 29,890 14,803,769 — Commercial real estate 5,327,481 2,992 — 7,174 5,337,647 3 Loans to individuals: Residential mortgage 2,149,927 6,340 1,494 2,879 2,160,640 36 Residential mortgage guaranteed by U.S. government agencies 54,122 25,085 17,053 53,547 149,807 48,201 Personal 1,450,302 2,561 88 154 1,453,105 131 Total loans to individuals 3,654,351 33,986 18,635 56,580 3,763,552 48,368 Total $ 23,705,831 $ 55,411 $ 50,082 $ 93,644 $ 23,904,968 $ 48,371

Mortgage Banking Activities (Ta

Mortgage Banking Activities (Tables)	3 Months Ended
	Mar. 31, 2024
Mortgage Banking [Abstract]
Components of Residential Mortgage Loans Held For Sale [Table Text Block]	March 31, 2024 December 31, 2023 Unpaid Principal Balance/ Fair Value Unpaid Principal Balance/ Fair Value Residential mortgage loans held for sale $ 73,937 $ 73,090 $ 56,922 $ 56,457 Residential mortgage loan commitments 67,951 2,473 34,783 1,379 Forward sales contracts 108,070 (114) 75,448 (901) $ 75,449 $ 56,935
Mortgage Banking Revenue [Table Text Block]	Mortgage banking revenue was as follows (in thousands): Three Months Ended 2024 2023 Production revenue: Net realized gains (losses) on sale of mortgage loans $ 2,026 $ (1,731) Net change in unrealized gain (loss) on mortgage loans held for sale (382) 370 Net change in the fair value of mortgage loan commitments 1,094 1,640 Net change in the fair value of forward sales contracts 787 (912) Total production revenue (loss) 3,525 (633) Servicing revenue 15,442 15,000 Total mortgage banking revenue $ 18,967 $ 14,367
Summary of Mortgage Servicing Rights [Table Text Block]	The following represents a summary of mortgage servicing rights (dollars in thousands): March 31, 2024 December 31, 2023 Number of residential mortgage loans serviced for others 122,276 115,967 Outstanding principal balance of residential mortgage loans serviced for others $ 21,432,048 $ 20,382,192 Weighted average interest rate 3.66 % 3.64 % Remaining term (in months) 278 280
Activity in Capitalized Mortgage Servicing Rights [Table Text Block]	The following represents activity in capitalized mortgage servicing rights (in thousands): Three Months Ended March 31, 2024 2023 Beginning Balance $ 293,884 $ 277,608 Additions 2,516 2,500 Acquisitions 17,400 31,138 Change in fair value due to principal payments (5,447) (5,384) Change in fair value due to market assumption changes 10,977 (6,059) Ending Balance $ 319,330 $ 299,803
Assumptions to Value Mortgage Servicing Rights [Table Text Block]	Mortgage servicing rights are not traded in active markets. Fair value is determined by discounting the projected net cash flows. Significant market assumptions used to determine fair value based on significant unobservable inputs were as follows: March 31, 2024 December 31, 2023 Discount rate – risk-free rate plus a market premium 9.82% 9.72% Prepayment rate - based upon loan interest rate, original term and loan type 6.83% 7.34% Loan servicing costs – annually per loan based upon loan type: Performing loans $73 - $94 $69 - $94 Delinquent loans $150 - $500 $150 - $500 Loans in foreclosure $875 - $8,000 $875 - $8,000 Escrow earnings rate – indexed to rates paid on deposit accounts with comparable average life 4.27% 3.90% Primary/secondary mortgage rate spread 115 bps 105 bps Delinquency rate 2.06% 2.06%

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	3 Months Ended
	Mar. 31, 2024
Stockholders' Equity Note [Abstract]
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 Investment Securities Transferred from AFS Total Balance, Dec. 31, 2022 $ (664,618) $ (172,337) (836,955) Net change in unrealized gain (loss) 124,045 — 124,045 Reclassification adjustments included in earnings: Interest revenue, Investment securities — 16,051 16,051 Other comprehensive income, before income taxes 124,045 16,051 140,096 Federal and state income taxes 28,179 3,516 31,695 Other comprehensive income, net of income taxes 95,866 12,535 108,401 Balance, March 31, 2023 $ (568,752) $ (159,802) $ (728,554) Balance, Dec. 31, 2023 $ (473,212) $ (125,888) $ (599,100) Net change in unrealized gain (loss) (71,806) — (71,806) Reclassification adjustments included in earnings: Interest revenue, Investment securities — 12,183 12,183 Loss on available for sale securities, net 45,171 — 45,171 Other comprehensive income (loss), before income taxes (26,635) 12,183 (14,452) Federal and state income taxes (6,289) 2,865 (3,424) Other comprehensive income (loss), net of income taxes (20,346) 9,318 (11,028) Balance, March 31, 2024 $ (493,558) $ (116,570) $ (610,128)

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2024
Earnings Per Share [Abstract]
Earnings Per Share [Table Text Block]	(In thousands, except share and per share amounts) Three Months Ended March 31, 2024 2023 Numerator: Net income attributable to BOK Financial Corp. shareholders $ 83,703 $ 162,368 Less: Earnings allocated to participating securities 676 1,255 Numerator for basic earnings per share – income available to common shareholders 83,027 161,113 Effect of reallocating undistributed earnings of participating securities — — Numerator for diluted earnings per share – income available to common shareholders $ 83,027 $ 161,113 Denominator: Weighted average shares outstanding 64,812,555 66,849,288 Less: Participating securities included in weighted average shares outstanding 522,450 517,513 Denominator for basic earnings per common share 64,290,105 66,331,775 Dilutive effect of employee stock compensation plans — — Denominator for diluted earnings per common share 64,290,105 66,331,775 Basic earnings per share $ 1.29 $ 2.43 Diluted earnings per share $ 1.29 $ 2.43

Reportable Segments (Tables)

Reportable Segments (Tables)	3 Months Ended
	Mar. 31, 2024
Segment Reporting [Abstract]
Reportable Segments [Table Text Block]	Reportable segments reconciliation to the Consolidated Financial Statements for the three months ended March 31, 2024 is as follows (in thousands): Commercial Consumer Wealth Funds Management and Other BOK Net interest revenue from external sources $ 282,447 $ 7,350 $ 6,999 $ (3,224) $ 293,572 Net interest revenue (expense) from internal sources (37,326) 94,799 33,110 (90,583) — Net interest revenue 245,121 102,149 40,109 (93,807) 293,572 Net loans charged off and provision for credit losses 4,160 1,808 (15) 2,047 8,000 Net interest revenue after provision for credit losses 240,961 100,341 40,124 (95,854) 285,572 Other operating revenue 50,006 36,207 118,704 (43,216) 161,701 Other operating expense 70,095 53,447 99,535 117,307 340,384 Net direct contribution 220,872 83,101 59,293 (256,377) 106,889 Gain (loss) on financial instruments, net 167 (9,663) — 9,496 — Change in fair value of mortgage servicing rights — 10,977 — (10,977) — Gain (loss) on repossessed assets, net — 107 — (107) — Corporate expense allocations 18,397 14,172 14,558 (47,127) — Net income before taxes 202,642 70,350 44,735 (210,838) 106,889 Federal and state income taxes 49,392 16,546 10,570 (53,313) 23,195 Net income 153,250 53,804 34,165 (157,525) 83,694 Net income attributable to non-controlling interests — — — (9) (9) Net income attributable to BOK Financial Corp. shareholders $ 153,250 $ 53,804 $ 34,165 $ (157,516) $ 83,703 Average assets $ 29,806,817 $ 9,391,981 $ 15,759,328 $ (4,930,554) $ 50,027,572 Reportable segments reconciliation to the Consolidated Financial Statements for the three months ended March 31, 2023 is as follows (in thousands): Commercial Consumer Wealth Funds Management and Other BOK Net interest revenue from external sources $ 287,988 $ 21,146 $ 20,940 $ 22,274 $ 352,348 Net interest revenue (expense) from internal sources (3,932) 88,235 33,166 (117,469) — Net interest revenue 284,056 109,381 54,106 (95,195) 352,348 Net loans charged off and provision for credit losses 76 1,184 (24) 14,764 16,000 Net interest revenue after provision for credit losses 283,980 108,197 54,130 (109,959) 336,348 Other operating revenue 56,845 30,610 108,911 (18,501) 177,865 Other operating expense 73,134 50,198 82,039 100,441 305,812 Net direct contribution 267,691 88,609 81,002 (228,901) 208,401 Gain (loss) on financial instruments, net (58) (4,673) — 4,731 — Change in fair value of mortgage servicing rights — (6,059) — 6,059 — Gain (loss) on repossessed assets, net 859 14 — (873) — Corporate expense allocations 17,718 11,622 12,360 (41,700) — Net income before taxes 250,774 66,269 68,642 (177,284) 208,401 Federal and state income taxes 60,543 15,586 16,195 (46,419) 45,905 Net income 190,231 50,683 52,447 (130,865) 162,496 Net loss attributable to non-controlling interests — — — 128 128 Net income attributable to BOK Financial Corp. shareholders $ 190,231 $ 50,683 $ 52,447 $ (130,993) $ 162,368 Average assets $ 28,162,934 $ 9,934,511 $ 11,663,096 $ (3,778,073) $ 45,982,468

Fees and Commissions Revenue _2

Fees and Commissions Revenue Fees and Commissions Rvenue (Tables)	3 Months Ended
	Mar. 31, 2024
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 three months ended March 31, 2024 (in thousands): Commercial Consumer Wealth Management Funds Management & Other Consolidated Out of Scope 1 In Scope 2 Trading revenue $ — $ — $ 37,457 $ — $ 37,457 $ 37,457 $ — Customer hedging revenue 3,743 — 2,020 562 6,325 6,325 — Retail brokerage revenue — — 4,693 — 4,693 — 4,693 Investment banking revenue 3,819 — 6,885 — 10,704 3,094 7,610 Brokerage and trading revenue 7,562 — 51,055 562 59,179 46,876 12,303 TransFund EFT network revenue 20,466 826 (18) — 21,274 — 21,274 Merchant services revenue 2,180 9 — — 2,189 — 2,189 Corporate card revenue 1,738 — 179 113 2,030 — 2,030 Transaction card revenue 24,384 835 161 113 25,493 — 25,493 Personal trust revenue — — 24,345 — 24,345 — 24,345 Corporate trust revenue — — 9,260 — 9,260 — 9,260 Institutional trust & retirement plan services revenue — — 16,148 — 16,148 — 16,148 Investment management services and other revenue — — 5,552 — 5,552 — 5,552 Fiduciary and asset management revenue — — 55,305 — 55,305 — 55,305 Commercial account service charge revenue 14,900 531 546 — 15,977 — 15,977 Overdraft fee revenue 36 5,394 30 — 5,460 — 5,460 Check card revenue — 5,670 — — 5,670 — 5,670 Automated service charge and other deposit fee revenue 269 1,236 73 — 1,578 — 1,578 Deposit service charges and fees 15,205 12,831 649 — 28,685 — 28,685 Mortgage production revenue — 3,525 — — 3,525 3,525 — Mortgage servicing revenue — 16,115 — (673) 15,442 15,442 — Mortgage banking revenue — 19,640 — (673) 18,967 18,967 — Other revenue 3,479 2,901 11,534 (4,979) 12,935 7,912 5,023 Total fees and commissions revenue $ 50,630 $ 36,207 $ 118,704 $ (4,977) $ 200,564 $ 73,755 $ 126,809 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 three months ended March 31, 2023 (in thousands): Commercial Consumer Wealth Management Funds Management & Other Consolidated Out of Scope 1 In Scope 2 Trading revenue $ — $ — $ 27,598 $ — $ 27,598 $ 27,598 $ — Customer hedging revenue 6,487 — 100 1,767 8,354 8,354 — Retail brokerage revenue — — 3,844 — 3,844 — 3,844 Insurance brokerage revenue — — 3,306 — 3,306 — 3,306 Investment banking revenue 3,698 — 5,596 — 9,294 3,598 5,696 Brokerage and trading revenue 10,185 — 40,444 1,767 52,396 39,550 12,846 TransFund EFT network revenue 20,499 908 (17) 2 21,392 — 21,392 Merchant services revenue 2,150 8 — — 2,158 — 2,158 Corporate card revenue 1,785 — 177 109 2,071 — 2,071 Transaction card revenue 24,434 916 160 111 25,621 — 25,621 Personal trust revenue — — 23,527 — 23,527 — 23,527 Corporate trust revenue — — 7,660 — 7,660 — 7,660 Institutional trust & retirement plan services revenue — — 13,253 — 13,253 — 13,253 Investment management services and other revenue — — 6,238 (21) 6,217 — 6,217 Fiduciary and asset management revenue — — 50,678 (21) 50,657 — 50,657 Commercial account service charge revenue 12,871 499 477 — 13,847 — 13,847 Overdraft fee revenue 25 4,828 20 — 4,873 — 4,873 Check card revenue — 5,638 — 1 5,639 — 5,639 Automated service charge and other deposit fee revenue 237 1,313 59 — 1,609 — 1,609 Deposit service charges and fees 13,133 12,278 556 1 25,968 — 25,968 Mortgage production revenue — (633) — — (633) (633) — Mortgage servicing revenue — 15,558 — (558) 15,000 15,000 — Mortgage banking revenue — 14,925 — (558) 14,367 14,367 — Other revenue 8,083 2,462 17,073 (10,648) 16,970 8,560 8,410 Total fees and commissions revenue $ 55,835 $ 30,581 $ 108,911 $ (9,348) $ 185,979 $ 62,477 $ 123,502 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)	3 Months Ended
	Mar. 31, 2024
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 measured on a recurring basis was as follows as of March 31, 2024 (in thousands): Total Quoted Prices in Active Markets for Identical Instruments (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs Assets: Trading securities: U.S. government securities $ 426,825 $ 370,062 $ 56,763 $ — Residential agency mortgage-backed securities 4,898,485 — 4,898,485 — Municipal securities 67,120 — 67,120 — Other trading securities 48,608 — 48,608 — Total trading securities 5,441,038 370,062 5,070,976 — Available for sale securities: U.S. Treasury 920 920 — — Municipal securities 304,826 — 304,826 — Residential agency mortgage-backed securities 7,816,688 — 7,816,688 — Residential non-agency mortgage-backed securities 846,805 — 846,805 — Commercial agency mortgage-backed securities 3,683,376 — 3,683,376 — Other debt securities 473 — — 473 Total available for sale securities 12,653,088 920 12,651,695 473 Fair value option securities — Residential agency mortgage-backed securities 19,805 — 19,805 — Residential mortgage loans held for sale 1 75,449 — 68,285 7,164 Mortgage servicing rights 2 319,330 — — 319,330 Derivative contracts, net of cash collateral 3 263,493 10 263,483 — Liabilities: Derivative contracts, net of cash collateral 3 438,605 649 437,956 — 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 77.97% 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 5, Mortgage Banking Activities. 3 See Note 3 for detail of fair value of derivative contracts by contract type. Derivative contracts in asset and liability positions that were valued based on quoted prices in active markets for identical instruments (Level 1) are primarily exchange-traded interest rate derivative contracts held for trading purposes . The fair value of financial assets and liabilities measured on a recurring basis was as follows as of December 31, 2023 (in thousands): Total Quoted Prices in Active Markets for Identical Instruments (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs Assets: Trading securities: U.S. government securities $ 10,959 $ 9,017 $ 1,942 $ — Residential agency mortgage-backed securities 5,105,137 — 5,105,137 — Municipal securities 37,413 — 37,413 — Other trading securities 39,996 — 39,996 — Total trading securities 5,193,505 9,017 5,184,488 — Available for sale securities: U.S. Treasury 925 925 — — Municipal securities 502,833 — 502,833 — Residential agency mortgage-backed securities 6,834,720 — 6,834,720 — Residential non-agency mortgage-backed securities 799,877 — 799,877 — Commercial agency mortgage-backed securities 4,147,853 — 4,147,853 — Other debt securities 473 — — 473 Total available for sale securities 12,286,681 925 12,285,283 473 Fair value option securities — Residential agency mortgage-backed securities 20,671 — 20,671 — Residential mortgage loans held for sale 1 56,935 — 49,749 7,186 Mortgage servicing rights 2 293,884 — — 293,884 Derivative contracts, net of cash collateral 3 410,304 — 410,304 — Liabilities: Derivative contracts, net of cash collateral 3 587,473 2,607 584,866 — 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 77.74% 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 5, Mortgage Banking Activities. 3 See Note 3 for detail of fair value of derivative contracts by contract type. Derivative contracts in asset and liability positions that were valued based on quoted prices in active markets for identical instruments (Level 1) are primarily exchange-traded interest rate derivative contracts held for trading purposes.
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) during the period. The carrying value represents only those assets with a balance at March 31, 2024 for which the fair value was adjusted during the three months ended March 31, 2024 (in thousands): Fair Value Adjustments for the Carrying Value at March 31, 2024 Three Months Ended Quoted Prices Significant Significant Gross charge-offs against allowance for loan losses Other gains (losses), net Nonaccruing loans $ — $ 67 $ 23,741 $ 4,935 $ — The following represents the carrying value of assets measured at fair value on a non-recurring basis (and related losses) during the period. The carrying value represents only those assets with a balance at March 31, 2023 for which the fair value was adjusted during the three months ended March 31, 2023 (in thousands): Fair Value Adjustments for the Carrying Value at March 31, 2023 Three Months Ended Quoted Prices Significant Significant Gross charge-offs against allowance for loan losses Other gains (losses), net Nonaccruing loans $ — $ — $ 14,040 $ 1,991 $ — Real estate and other repossessed assets — 547 — — (101)
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 March 31, 2024 follows (dollars in thousands): Fair Value Valuation Technique(s) Unobservable Input Range Nonaccruing loans $ 23,741 Discounted cash flows Management knowledge of industry and non-real estate collateral 17% - 96% (83%) 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 March 31, 2023 follows (dollars in thousands): Fair Value Valuation Technique(s) Unobservable Input Range Nonaccruing loans $ 14,040 Discounted cash flows Management knowledge of industry and non-real estate collateral including, but not limited to, recoverable oil and gas reserves, forward-looking commodity prices, estimated operating costs 88% - 88% (88%) 1 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 are measured at fair value on a non-recurring basis as of March 31, 2024 (in thousands): Carrying Estimated Quoted Prices in Active Markets for Identical Instruments (Level 1) Significant Other Observable Inputs Significant Unobservable Inputs Cash and due from banks $ 801,677 $ 801,677 $ 801,677 $ — $ — Interest-bearing cash and cash equivalents 354,070 354,070 354,070 — — Trading securities: U.S. government securities 426,825 426,825 370,062 56,763 — Residential agency mortgage-backed securities 4,898,485 4,898,485 — 4,898,485 — Municipal securities 67,120 67,120 — 67,120 — Other trading securities 48,608 48,608 — 48,608 — Total trading securities 5,441,038 5,441,038 370,062 5,070,976 — Investment securities: Municipal securities 108,793 112,338 — 12,103 100,235 Residential agency mortgage-backed securities 2,044,972 1,858,027 — 1,858,027 — Commercial agency mortgage-backed securities 15,990 14,987 — 14,987 — Other debt securities 16,288 14,713 — 14,713 — Total investment securities 2,186,043 2,000,065 — 1,899,830 100,235 Allowance for credit losses (299) — — — — Investment securities, net of allowance 2,185,744 2,000,065 — 1,899,830 100,235 Available for sale securities: U.S. Treasury 920 920 920 — — Municipal securities 304,826 304,826 — 304,826 — Residential agency mortgage-backed securities 7,816,688 7,816,688 — 7,816,688 — Residential non-agency mortgage-backed securities 846,805 846,805 — 846,805 — Commercial agency mortgage-backed securities 3,683,376 3,683,376 — 3,683,376 — Other debt securities 473 473 — — 473 Total available for sale securities 12,653,088 12,653,088 920 12,651,695 473 Fair value option securities — Residential agency mortgage-backed securities 19,805 19,805 — 19,805 — Residential mortgage loans held for sale 75,449 75,449 — 68,285 7,164 Loans: Commercial 15,132,867 15,055,904 — — 15,055,904 Commercial real estate 5,236,677 5,143,304 — — 5,143,304 Loans to individuals 3,803,016 3,675,612 — — 3,675,612 Total loans 24,172,560 23,874,820 — — 23,874,820 Allowance for loan losses (281,623) — — — — Loans, net of allowance 23,890,937 23,874,820 — — 23,874,820 Mortgage servicing rights 319,330 319,330 — — 319,330 Derivative instruments with positive fair value, net of cash collateral 263,493 263,493 10 263,483 — Deposits with no stated maturity 32,016,638 32,016,638 — — 32,016,638 Time deposits 3,366,909 3,346,163 — — 3,346,163 Other borrowed funds 7,986,169 7,986,169 — — 7,986,169 Subordinated debentures 131,154 118,875 — 118,875 — Derivative instruments with negative fair value, net of cash collateral 438,605 438,605 649 437,956 — 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 are measured at fair value on a non-recurring basis as of December 31, 2023 (in thousands): Carrying Estimated Quoted Prices in Active Markets for Identical Instruments (Level 1) Significant Other Observable Inputs Significant Unobservable Inputs Cash and due from banks $ 947,613 $ 947,613 $ 947,613 $ — $ — Interest-bearing cash and cash equivalents 400,652 400,652 400,652 — — Trading securities: U.S. government securities 10,959 10,959 9,017 1,942 — Residential agency mortgage-backed securities 5,105,137 5,105,137 — 5,105,137 — Municipal securities 37,413 37,413 — 37,413 — Other trading securities 39,996 39,996 — 39,996 — Total trading securities 5,193,505 5,193,505 9,017 5,184,488 — Investment securities: Municipal securities 120,705 125,525 — 12,305 113,220 Residential agency mortgage-backed securities 2,092,083 1,917,810 — 1,917,810 — Commercial agency mortgage-backed securities 15,914 15,067 — 15,067 — Other debt securities 15,787 14,184 — 14,184 — Total investment securities 2,244,489 2,072,586 — 1,959,366 113,220 Allowance for credit losses (336) — — — — Investment securities, net of allowance 2,244,153 2,072,586 — 1,959,366 113,220 Available for sale securities: U.S. Treasury 925 925 925 — — Municipal securities 502,833 502,833 — 502,833 — Residential agency mortgage-backed securities 6,834,720 6,834,720 — 6,834,720 — Residential non-agency mortgage-backed securities 799,877 799,877 — 799,877 — Commercial agency mortgage-backed securities 4,147,853 4,147,853 — 4,147,853 — Other debt securities 473 473 — — 473 Total available for sale securities 12,286,681 12,286,681 925 12,285,283 473 Fair value option securities — Residential agency mortgage-backed securities 20,671 20,671 — 20,671 — Residential mortgage loans held for sale 56,935 56,935 — 49,749 7,186 Loans: Commercial 14,803,769 14,862,873 — — 14,862,873 Commercial real estate 5,337,647 5,270,657 — — 5,270,657 Loans to individuals 3,763,552 3,634,855 — — 3,634,855 Total loans 23,904,968 23,768,385 — — 23,768,385 Allowance for loan losses (277,123) — — — — Loans, net of allowance 23,627,845 23,768,385 — — 23,768,385 Mortgage servicing rights 293,884 293,884 — — 293,884 Derivative instruments with positive fair value, net of cash collateral 410,304 410,304 — 410,304 — Deposits with no stated maturity 31,007,679 31,007,679 — — 31,007,679 Time deposits 3,012,022 2,993,685 — — 2,993,685 Other borrowed funds 8,824,300 8,824,299 — — 8,824,299 Subordinated debentures 131,150 115,798 — 115,798 — Derivative instruments with negative fair value, net of cash collateral 587,473 587,473 2,607 584,866 —

Significant Accounting Polici_3

Significant Accounting Policies Loans and Allowance for Credit Losses (Details)	3 Months Ended
	Mar. 31, 2024
Loans and Allowance for Credit Losses [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 and Allowances for Credit Losses, Minimum No of Days After Which Past Due Non-Risk Graded Loans Are Charged Off	60 days
Loans and Allowances for Credit Losses, Maximum No 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

Trading Securities (Details)

Trading Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Schedule of Trading Securities [Line Items]
Trading Securities, Fair Value	$ 5,441,038	$ 5,193,505
Trading Securities, Net Unrealized Gain (Loss)	8,362	98,635
U.S. government securities [Member]
Schedule of Trading Securities [Line Items]
Trading Securities, Fair Value	426,825	10,959
Trading Securities, Net Unrealized Gain (Loss)	(194)	28
Residential agency mortgage-backed securities [Member]
Schedule of Trading Securities [Line Items]
Trading Securities, Fair Value	4,898,485	5,105,137
Trading Securities, Net Unrealized Gain (Loss)	8,571	98,124
Municipal securities [Member]
Schedule of Trading Securities [Line Items]
Trading Securities, Fair Value	67,120	37,413
Trading Securities, Net Unrealized Gain (Loss)	(142)	323
Other trading securities [Member]
Schedule of Trading Securities [Line Items]
Trading Securities, Fair Value	48,608	39,996
Trading Securities, Net Unrealized Gain (Loss)	$ 127	$ 160

Investment (Held-to-Maturity) S

Investment (Held-to-Maturity) Securities (Details) $ in Thousands		3 Months Ended		12 Months Ended
		Mar. 31, 2024 USD ($)		Dec. 31, 2023 USD ($)
Schedule of Investment (Held-to-Maturity) Securities [Line Items]
Investment Securities, Gross Amortized Cost		$ 2,338,460		$ 2,409,090
Investment Securities, Gross Carrying Value		2,186,043	[1]	2,244,489	[2]
Investment securities, Allowance for Credit Loss		(299)	[1]	(336)	[2]
Investment Securities, Amortized Cost, After Allowance for Credit Loss		2,338,161		2,408,754
Investment Securities, Carrying Value, after Allowance for Credit Loss		2,185,744	[1]	2,244,153	[2]
Investment Securities, Fair Value		2,000,065		2,072,586
Investment Securities, Gross Unrealized Gain		3,927		5,139
Investment Securities, Gross Unrealized Loss		(189,905)		(177,042)
Debt Securities, Net Unrealized Loss Remaining in AOCI included in Carrying Value for AFS Securities Transferred to Investment Securities		$ (152,000)		$ (165,000)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions		141		134
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		$ 17,310		$ 1,931
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		1,887,274		1,947,071
Investment Securities, Continuous Unrealized Loss Position, Fair Value		1,904,584		1,949,002
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		81		5
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		189,824		177,037
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss		189,905		177,042
Fixed Maturity Securities [Member]
Investment Securities, Debt Maturities, Net Carrying Value [Abstract]
Investment Securities, Debt Maturities, Less than One Year, Net Carrying Value		19,248
Investment Securities, Debt Maturities, One to Five Years, Net Carrying Value		95,707
Investment Securities, Debt Maturities, Six to Ten Years, Net Carrying Value		26,103
Investment Securities, Debt Maturities, Over Ten Years, Net Carrying Value		13
Investment Securities, Debt Maturities, Single Maturity Date, Net Carrying Value		141,071
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]
Investment Securities, Debt Maturities, Less Than One Year, Fair Value		19,468
Investment Securities, Debt Maturities, One to Five Years, Fair Value		98,033
Investment Securities, Debt Maturities, Six to Ten Years, Fair Value		24,524
Investment Securities, Debt Maturities, Over Ten Years, Fair Value		13
Investment Securities, Debt Maturities, Single Maturity Date, Fair Value		$ 142,038
Investment Securities, Debt Maturities, Weighted Average Maturity	[3]	3.27
Municipal securities [Member]
Schedule of Investment (Held-to-Maturity) Securities [Line Items]
Investment Securities, Gross Amortized Cost		$ 108,793		120,705
Investment Securities, Gross Carrying Value		108,793	[1]	120,705	[2]
Investment Securities, Fair Value		112,338		125,525
Investment Securities, Gross Unrealized Gain		3,828		5,014
Investment Securities, Gross Unrealized Loss		$ (283)		$ (194)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions		20		13
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		$ 17,310		$ 1,931
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		6,587		6,600
Investment Securities, Continuous Unrealized Loss Position, Fair Value		23,897		8,531
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		81		5
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		202		189
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss		283		194
Residential agency mortgage-backed securities [Member]
Schedule of Investment (Held-to-Maturity) Securities [Line Items]
Investment Securities, Gross Amortized Cost		2,196,121		2,255,340
Investment Securities, Gross Carrying Value		2,044,972	[1]	2,092,083	[2]
Investment Securities, Fair Value		1,858,027		1,917,810
Investment Securities, Gross Unrealized Gain		99		125
Investment Securities, Gross Unrealized Loss		(187,044)		$ (174,398)
Investment Securities, Debt Maturities, Net Carrying Value [Abstract]
Investment Securities, Debt Maturities, without Single Maturity Date, Net Carrying Value	[4]	2,044,972
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]
Investment Securities, Debt Maturities, without Single Maturity Date, Fair Value		$ 1,858,027
Investment Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities		4 years 10 months 24 days
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions		116		116
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		$ 0		$ 0
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		1,857,000		1,916,732
Investment Securities, Continuous Unrealized Loss Position, Fair Value		1,857,000		1,916,732
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		0		0
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		187,044		174,398
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss		187,044		174,398
Commercial agency mortgage-backed securities [Member]
Schedule of Investment (Held-to-Maturity) Securities [Line Items]
Investment Securities, Gross Amortized Cost		17,258		17,258
Investment Securities, Gross Carrying Value		15,990	[1]	15,914	[2]
Investment Securities, Fair Value		14,987		15,067
Investment Securities, Gross Unrealized Gain		0		0
Investment Securities, Gross Unrealized Loss		$ (1,003)		$ (847)
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		$ 0		$ 0
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		14,987		15,067
Investment Securities, Continuous Unrealized Loss Position, Fair Value		14,987		15,067
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		0		0
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		1,003		847
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss		1,003		847
Other debt securities [Member]
Schedule of Investment (Held-to-Maturity) Securities [Line Items]
Investment Securities, Gross Amortized Cost		16,288		15,787
Investment Securities, Gross Carrying Value		16,288	[1]	15,787	[2]
Investment Securities, Fair Value		14,713		14,184
Investment Securities, Gross Unrealized Gain		0		0
Investment Securities, Gross Unrealized Loss		$ (1,575)		$ (1,603)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions		3		3
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		$ 0		$ 0
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		8,700		8,672
Investment Securities, Continuous Unrealized Loss Position, Fair Value		8,700		8,672
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		0		0
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		1,575		1,603
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss		$ 1,575		$ 1,603
[1] Carrying value includes $152 million of net unrealized loss which remains in AOCI in the Consolidated Balance Sheets related to certain securities transferred during the second quarter of 2022 from the Available for Sale securities portfolio to the Investment securities portfolio. Carrying value includes $165 million of net unrealized loss which remains in AOCI in the Consolidated Balance Sheets related to certain securities transferred during the second quarter of 2022 from the Available for Sale securities portfolio to the Investment securities portfolio. Expected maturities may differ from contractual maturities, because borrowers may have the right to call or prepay obligations with or without penalty. The average expected lives of residential mortgage-backed securities were 4.9 years based upon current prepayment assumptions.

Available for Sale Securities (

Available for Sale Securities (Details) $ in Thousands		3 Months Ended
		Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Amortized Cost		$ 13,296,347		$ 12,903,305
Available-for-sale Securities, Fair Value		12,653,088		12,286,681
Available-for-sale Securities, Gross Unrealized Gain		32,435		52,821
Available-for-sale Securities, Gross Unrealized Loss		(675,694)		$ (669,445)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]
Available-for-sale Securities, Proceeds		735,994	$ 0
Available-for-sale Securities, Gross realized gains		233	0
Available-for-sale Securities, Gross realized losses		(45,404)	0
Available-for-sale Securities, Related federal and state income tax expense (benefit)		$ (10,624)	$ 0
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions		1,131		1,123
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		$ 2,562,022		$ 1,205,822
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		13,686		7,969
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		7,483,659		8,087,455
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		662,008		661,476
Debt Securities, Available-for-sale, Unrealized Loss Position		10,045,681		9,293,277
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		675,694		669,445
Asset Pledged as Collateral with Right
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]
Pledged Securities		18,900,000		13,900,000
Fixed Maturity Securities [Member]
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]
Available-for-sale Securities, Debt Maturities, Less than One Year, Amortized Cost Basis		473,589
Available-for-sale Securities, Debt Maturities, One to Five Years, Amortized Cost Basis		2,480,160
Available-for-sale Securities, Debt Maturities, Six To Ten Years, Amortized Cost Basis		915,033
Available-for-sale Securities, Debt Maturities, Over Ten Years, Amortized Cost Basis		447,154
Available-for-sale Securities, Debt Maturities, Allocated and Single Maturity Date, Amortized Cost		4,315,936
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]
Available-for-sale Securities, Debt Maturities, Less than One Year, Fair Value		468,688
Available-for-sale Securities, Debt Maturities, One to Five Years, Fair Value		2,254,408
Available-for-sale Securities, Debt Maturities, Six to Ten Years, Fair Value		841,253
Available-for-sale Securities, Debt Maturities, Over Ten Years, Fair Value		425,246
Available-for-sale Securities, Debt Maturities, Allocated and Single Maturity Date, Fair Value		$ 3,989,595
Available-for-sale Securities, Debt Maturities, Weighted Average Maturity	[1]	5.19
U.S. Treasury [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Amortized Cost		$ 1,000		1,000
Available-for-sale Securities, Fair Value		920		925
Available-for-sale Securities, Gross Unrealized Gain		0		0
Available-for-sale Securities, Gross Unrealized Loss		$ (80)		$ (75)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions		1		1
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		$ 0		$ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		0		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		920		925
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		80		75
Debt Securities, Available-for-sale, Unrealized Loss Position		920		925
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		80		75
Municipal securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Amortized Cost		329,216		544,707
Available-for-sale Securities, Fair Value		304,826		502,833
Available-for-sale Securities, Gross Unrealized Gain		0		1
Available-for-sale Securities, Gross Unrealized Loss		$ (24,390)		$ (41,875)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions		135		190
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		$ 3,139		$ 6,799
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		30		410
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		298,162		494,955
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		24,360		41,465
Debt Securities, Available-for-sale, Unrealized Loss Position		301,301		501,754
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		24,390		41,875
Commercial agency mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Amortized Cost		3,985,220		4,456,918
Available-for-sale Securities, Fair Value		3,683,376		4,147,853
Available-for-sale Securities, Gross Unrealized Gain		1,197		2,972
Available-for-sale Securities, Gross Unrealized Loss		$ (303,041)		$ (312,037)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions		245		269
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		$ 241,331		$ 392,828
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		2,625		2,626
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		3,148,535		3,421,757
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		300,416		309,411
Debt Securities, Available-for-sale, Unrealized Loss Position		3,389,866		3,814,585
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		303,041		312,037
Other debt securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Amortized Cost		500		500
Available-for-sale Securities, Fair Value		473		473
Available-for-sale Securities, Gross Unrealized Gain		0		0
Available-for-sale Securities, Gross Unrealized Loss		$ (27)		$ (27)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions		1		1
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		$ 0		$ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		0		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		473		473
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		27		27
Debt Securities, Available-for-sale, Unrealized Loss Position		473		473
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		27		27
Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost	[2]	8,980,411
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value		$ 8,663,493
Available-for-sale Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities		4 years 2 months 12 days
Residential agency mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Amortized Cost		$ 8,095,352		7,066,645
Available-for-sale Securities, Fair Value		7,816,688		6,834,720
Available-for-sale Securities, Gross Unrealized Gain		20,132		36,983
Available-for-sale Securities, Gross Unrealized Loss		$ (298,796)		$ (268,908)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions		711		630
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		$ 2,179,355		$ 690,118
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		10,501		3,689
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		3,502,950		3,717,975
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		288,296		265,219
Debt Securities, Available-for-sale, Unrealized Loss Position		5,682,306		4,408,093
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		298,797		268,908
Residential non-agency mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Amortized Cost		885,059		833,535
Available-for-sale Securities, Fair Value		846,805		799,877
Available-for-sale Securities, Gross Unrealized Gain		11,106		12,865
Available-for-sale Securities, Gross Unrealized Loss		$ (49,360)		$ (46,523)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions		38		32
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		$ 138,197		$ 116,077
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		530		1,244
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		532,619		451,370
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		48,829		45,279
Debt Securities, Available-for-sale, Unrealized Loss Position		670,815		567,447
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		$ 49,359		$ 46,523
[1] Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without penalty. The average expected lives of residential mortgage-backed securities were 4.2 years based upon current prepayment assumptions.

Securities Debt Securities, Ava

Securities Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value (Details) $ in Thousands	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	1,131	1,123
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 2,562,022	$ 1,205,822
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	7,483,659	8,087,455
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	10,045,681	9,293,277
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	13,686	7,969
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	662,008	661,476
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 675,694	$ 669,445
U.S. Treasury [Member]
Debt Securities, 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, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 0	$ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	920	925
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	920	925
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	80	75
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 80	$ 75
Municipal securities [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	135	190
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 3,139	$ 6,799
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	298,162	494,955
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	301,301	501,754
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	30	410
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	24,360	41,465
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 24,390	$ 41,875
Residential agency mortgage-backed securities [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	711	630
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 2,179,355	$ 690,118
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	3,502,950	3,717,975
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	5,682,306	4,408,093
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	10,501	3,689
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	288,296	265,219
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 298,797	$ 268,908
Residential non-agency mortgage-backed securities [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	38	32
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 138,197	$ 116,077
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	532,619	451,370
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	670,815	567,447
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	530	1,244
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	48,829	45,279
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 49,359	$ 46,523
Commercial agency mortgage-backed securities [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	245	269
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 241,331	$ 392,828
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	3,148,535	3,421,757
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	3,389,866	3,814,585
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	2,625	2,626
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	300,416	309,411
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 303,041	$ 312,037
Other debt securities [Member]
Debt Securities, 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, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 0	$ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	473	473
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	473	473
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	27	27
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 27	$ 27

Securities Fair Value Option Se

Securities Fair Value Option Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Fair Value Option Securities [Line Items]
Fair value option securities, Fair Value	$ 19,805	$ 20,671
Residential agency mortgage-backed securities [Member]
Fair Value Option Securities [Line Items]
Fair value option securities, Fair Value	19,805	20,671
Fair value option securities, Net Unrealized Gain (Loss)	$ (1,711)	$ (1,406)

Derivatives, Fair Value of Deri

Derivatives, Fair Value of Derivatives Contracts (Details) - USD ($) $ in Thousands		Mar. 31, 2024		Dec. 31, 2023
Derivative Assets, Fair Value, Net [Abstract]
Derviative contracts, net of cash collateral, Assets, Fair value		$ 263,493		$ 410,304
Derivative Liabilities, Fair Value, Net [Abstract]
Derivative Liabilities, Fair Value, Net of Cash Collateral		438,605		587,473
Not Designated as Hedging Instrument [Member]
Notional Amount of Derivatives [Abstract]
Derivative Assets, Notional		30,472,769	[1]	27,348,813	[2]
Derivative Liabilities, Notional		34,633,455	[1]	31,712,601	[2]
Derivative Assets, Fair Value, Net [Abstract]
Derivative Assets, Gross Fair Value		999,850		1,125,034
Derivative Assets, Netting Adjustments		(506,617)		(443,069)
Derivative Assets, Net Fair Value Before Cash Collateral		493,233		681,965
Derivative Assets, Cash Collateral		(229,740)		(271,661)
Derviative contracts, net of cash collateral, Assets, Fair value		263,493		410,304
Derivative Liabilities, Fair Value, Net [Abstract]
Derivative Liabilities, Gross Fair Value		1,021,229		1,218,900
Derivative Liabilities, Netting Adjustments		(506,617)		(443,069)
Derivative Liabilities, Net Fair Value Before Cash Collateral		514,612		775,831
Derivative Liabilities, Cash Collateral		(76,007)		(188,358)
Derivative Liabilities, Fair Value, Net of Cash Collateral		438,605		587,473
Not Designated as Hedging Instrument [Member] | Total customer risk management programs
Notional Amount of Derivatives [Abstract]
Derivative Assets, Notional		10,400,044	[1]	10,658,981	[2]
Derivative Liabilities, Notional		10,843,682	[1]	11,066,201	[2]
Derivative Assets, Fair Value, Net [Abstract]
Derivative Assets, Gross Fair Value		928,550		998,792
Derivative Assets, Netting Adjustments		(465,139)		(405,958)
Derivative Assets, Net Fair Value Before Cash Collateral		463,411		592,834
Derivative Assets, Cash Collateral		(229,696)		(264,665)
Derviative contracts, net of cash collateral, Assets, Fair value		233,715		328,169
Derivative Liabilities, Fair Value, Net [Abstract]
Derivative Liabilities, Gross Fair Value		925,163		992,988
Derivative Liabilities, Netting Adjustments		(465,139)		(405,958)
Derivative Liabilities, Net Fair Value Before Cash Collateral		460,024		587,030
Derivative Liabilities, Cash Collateral		(29,444)		(6,441)
Derivative Liabilities, Fair Value, Net of Cash Collateral		430,580		580,589
Not Designated as Hedging Instrument [Member] | Interest rate contracts [Member]
Notional Amount of Derivatives [Abstract]
Derivative Assets, Notional		3,075,103	[1]	2,754,476	[2]
Derivative Liabilities, Notional	[1]	3,065,103		2,754,476
Derivative Assets, Fair Value, Net [Abstract]
Derivative Assets, Gross Fair Value		118,237		108,450
Derivative Assets, Netting Adjustments		(3,844)		(6,810)
Derivative Assets, Net Fair Value Before Cash Collateral		114,393		101,640
Derivative Assets, Cash Collateral		(111,283)		(94,608)
Derviative contracts, net of cash collateral, Assets, Fair value		3,110		7,032
Derivative Liabilities, Fair Value, Net [Abstract]
Derivative Liabilities, Gross Fair Value		116,796		108,402
Derivative Liabilities, Netting Adjustments		(3,844)		(6,810)
Derivative Liabilities, Net Fair Value Before Cash Collateral		112,952		101,592
Derivative Liabilities, Cash Collateral		0		0
Derivative Liabilities, Fair Value, Net of Cash Collateral		112,952		101,592
Not Designated as Hedging Instrument [Member] | Energy contracts [Member]
Notional Amount of Derivatives [Abstract]
Derivative Assets, Notional		7,266,492	[1]	7,846,190	[2]
Derivative Liabilities, Notional		7,720,466	[1]	8,254,004	[2]
Derivative Assets, Fair Value, Net [Abstract]
Derivative Assets, Gross Fair Value		754,565		836,425
Derivative Assets, Netting Adjustments		(461,295)		(399,148)
Derivative Assets, Net Fair Value Before Cash Collateral		293,270		437,277
Derivative Assets, Cash Collateral		(117,521)		(169,141)
Derviative contracts, net of cash collateral, Assets, Fair value		175,749		268,136
Derivative Liabilities, Fair Value, Net [Abstract]
Derivative Liabilities, Gross Fair Value		753,145		831,467
Derivative Liabilities, Netting Adjustments		(461,295)		(399,148)
Derivative Liabilities, Net Fair Value Before Cash Collateral		291,850		432,319
Derivative Liabilities, Cash Collateral		(29,444)		(6,441)
Derivative Liabilities, Fair Value, Net of Cash Collateral		262,406		425,878
Not Designated as Hedging Instrument [Member] | Foreign exchange contracts [Member]
Notional Amount of Derivatives [Abstract]
Derivative Assets, Notional		56,590	[1]	54,999	[2]
Derivative Liabilities, Notional		56,254	[1]	54,405	[2]
Derivative Assets, Fair Value, Net [Abstract]
Derivative Assets, Gross Fair Value		55,687		53,863
Derivative Assets, Netting Adjustments		0		0
Derivative Assets, Net Fair Value Before Cash Collateral		55,687		53,863
Derivative Assets, Cash Collateral		(842)		(872)
Derviative contracts, net of cash collateral, Assets, Fair value		54,845		52,991
Derivative Liabilities, Fair Value, Net [Abstract]
Derivative Liabilities, Gross Fair Value		55,161		53,065
Derivative Liabilities, Netting Adjustments		0		0
Derivative Liabilities, Net Fair Value Before Cash Collateral		55,161		53,065
Derivative Liabilities, Cash Collateral		0		0
Derivative Liabilities, Fair Value, Net of Cash Collateral		55,161		53,065
Not Designated as Hedging Instrument [Member] | Equity option contracts [Member]
Notional Amount of Derivatives [Abstract]
Derivative Assets, Notional		1,859	[1]	3,316	[2]
Derivative Liabilities, Notional		1,859	[1]	3,316	[2]
Derivative Assets, Fair Value, Net [Abstract]
Derivative Assets, Gross Fair Value		61		54
Derivative Assets, Netting Adjustments		0		0
Derivative Assets, Net Fair Value Before Cash Collateral		61		54
Derivative Assets, Cash Collateral		(50)		(44)
Derviative contracts, net of cash collateral, Assets, Fair value		11		10
Derivative Liabilities, Fair Value, Net [Abstract]
Derivative Liabilities, Gross Fair Value		61		54
Derivative Liabilities, Netting Adjustments		0		0
Derivative Liabilities, Net Fair Value Before Cash Collateral		61		54
Derivative Liabilities, Cash Collateral		0		0
Derivative Liabilities, Fair Value, Net of Cash Collateral		61		54
Not Designated as Hedging Instrument [Member] | Trading [Member]
Notional Amount of Derivatives [Abstract]
Derivative Assets, Notional		19,616,813	[1]	16,264,818	[2]
Derivative Liabilities, Notional		23,751,156	[1]	20,644,156	[2]
Derivative Assets, Fair Value, Net [Abstract]
Derivative Assets, Gross Fair Value		67,692		118,545
Derivative Assets, Netting Adjustments		(40,165)		(37,111)
Derivative Assets, Net Fair Value Before Cash Collateral		27,527		81,434
Derivative Assets, Cash Collateral		(44)		(6,996)
Derviative contracts, net of cash collateral, Assets, Fair value		27,483		74,438
Derivative Liabilities, Fair Value, Net [Abstract]
Derivative Liabilities, Gross Fair Value		93,502		224,648
Derivative Liabilities, Netting Adjustments		(40,165)		(37,111)
Derivative Liabilities, Net Fair Value Before Cash Collateral		53,337		187,537
Derivative Liabilities, Cash Collateral		(46,563)		(181,917)
Derivative Liabilities, Fair Value, Net of Cash Collateral		6,774		5,620
Not Designated as Hedging Instrument [Member] | Internal risk management programs [Member]
Notional Amount of Derivatives [Abstract]
Derivative Assets, Notional		455,912	[1]	425,014	[2]
Derivative Liabilities, Notional		38,617	[1]	2,244	[2]
Derivative Assets, Fair Value, Net [Abstract]
Derivative Assets, Gross Fair Value		3,608		7,697
Derivative Assets, Netting Adjustments		(1,313)		0
Derivative Assets, Net Fair Value Before Cash Collateral		2,295		7,697
Derivative Assets, Cash Collateral		0		0
Derviative contracts, net of cash collateral, Assets, Fair value		2,295		7,697
Derivative Liabilities, Fair Value, Net [Abstract]
Derivative Liabilities, Gross Fair Value		2,564		1,264
Derivative Liabilities, Netting Adjustments		(1,313)		0
Derivative Liabilities, Net Fair Value Before Cash Collateral		1,251		1,264
Derivative Liabilities, Cash Collateral		0		0
Derivative Liabilities, Fair Value, Net of Cash Collateral		$ 1,251		$ 1,264
[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		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]
Brokergage and Trading Revenue		$ 90,031	$ (54,739)
Gain (Loss) on Derivatives, Net		(8,633)	(1,344)
Total customer risk management programs
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]
Brokergage and Trading Revenue		6,325	8,354
Gain (Loss) on Derivatives, Net		0	0
Interest rate contracts [Member]
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]
Brokergage and Trading Revenue		2,460	1,770
Gain (Loss) on Derivatives, Net		0	0
Energy contracts [Member]
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]
Brokergage and Trading Revenue		3,815	6,553
Gain (Loss) on Derivatives, Net		0	0
Foreign exchange contracts [Member]
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]
Brokergage and Trading Revenue		50	31
Gain (Loss) on Derivatives, Net		0	0
Equity option contracts [Member]
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]
Brokergage and Trading Revenue		0	0
Gain (Loss) on Derivatives, Net		0	0
Trading [Member]
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]
Brokergage and Trading Revenue	[1]	83,706	(63,093)
Gain (Loss) on Derivatives, Net	[1]	0	0
Internal risk management programs [Member]
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]
Brokergage and Trading Revenue		0	0
Gain (Loss) on Derivatives, Net		$ (8,633)	$ (1,344)
[1] Represents changes in fair value of to-be-announced securities and other derivative instruments 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 Statements of Earnings.

Loans and Allowance for Credit

Loans and Allowance for Credit Losses, Loans by Portfolio Type (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Loan receivables disclosure [Abstract]
Loans, fixed rate of interest	$ 6,697,080	$ 6,633,234
Loans, variable rate of interest	17,355,965	17,126,265
Loans, non-accrual	119,515	145,469
Total	24,172,560	23,904,968
Credit Commitments [Abstract]
Outstanding commitments to extend credit	14,400,000
Outstanding standby letters of credit	734,000
Commercial [Member]
Loan receivables disclosure [Abstract]
Loans, fixed rate of interest	3,597,543	3,558,563
Loans, variable rate of interest	11,460,704	11,135,075
Loans, non-accrual	74,620	110,131
Total	15,132,867	14,803,769
Commercial real estate [Member]
Loan receivables disclosure [Abstract]
Loans, fixed rate of interest	784,301	791,757
Loans, variable rate of interest	4,430,289	4,538,570
Loans, non-accrual	22,087	7,320
Total	5,236,677	5,337,647
Loans to individuals [Member]
Loan receivables disclosure [Abstract]
Loans, fixed rate of interest	2,315,236	2,282,914
Loans, variable rate of interest	1,464,972	1,452,620
Loans, non-accrual	22,808	28,018
Total	$ 3,803,016	$ 3,763,552

Loans and Allowances for Cred_3

Loans and Allowances for Credit Losses, Activity in Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 277,123	$ 235,704	$ 235,704
Provision for loan losses	9,960	14,525
Loans charged off	(7,060)	(3,667)
Recoveries of loans previously charged off	1,600	2,898
Ending balance	281,623	249,460	277,123
Provision Details [Abstract]
Provision for credit losses	8,000	16,000
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning balance	48,977	60,919	60,919
Provision for off-balance sheet credit risk	(1,658)	2,024
Ending balance	47,319	62,943	48,977
Recorded investment [Abstract]
Collectively measured for impairment, recorded investment	24,053,045		23,759,499
Individually measured for impairment, recorded investment	119,515		145,469
Total	24,172,560		23,904,968
Related allowance [Abstract]
Collectively measured for impairment, related allowance	278,663		274,431
Individually measured for impairment, related allowance	2,960		2,692
Total	281,623		277,123
Commercial [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	141,232	131,586	131,586
Provision for loan losses	8,311	6,330
Loans charged off	(4,240)	(12)
Recoveries of loans previously charged off	964	1,994
Ending balance	146,267	139,898	141,232
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning balance	19,762	18,246	18,246
Provision for off-balance sheet credit risk	(1,972)	2,362
Ending balance	17,790	20,608	19,762
Recorded investment [Abstract]
Collectively measured for impairment, recorded investment	15,058,247		14,693,638
Individually measured for impairment, recorded investment	74,620		110,131
Total	15,132,867		14,803,769
Related allowance [Abstract]
Collectively measured for impairment, related allowance	143,307		138,540
Individually measured for impairment, related allowance	2,960		2,692
Total	146,267		141,232
Commercial real estate [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	94,718	57,648	57,648
Provision for loan losses	3,995	10,426
Loans charged off	(1,250)	(2,208)	(8,446)
Recoveries of loans previously charged off	16	137
Ending balance	97,479	66,003	94,718
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning balance	27,439	40,490	40,490
Provision for off-balance sheet credit risk	426	(279)
Ending balance	27,865	40,211	27,439
Recorded investment [Abstract]
Collectively measured for impairment, recorded investment	5,214,590		5,330,327
Individually measured for impairment, recorded investment	22,087		7,320
Total	5,236,677		5,337,647
Related allowance [Abstract]
Collectively measured for impairment, related allowance	97,479		94,718
Individually measured for impairment, related allowance	0		0
Total	97,479		94,718
Loans to individuals [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	41,173	46,470	46,470
Provision for loan losses	(2,346)	(2,231)
Loans charged off	(1,570)	(1,447)
Recoveries of loans previously charged off	620	767
Ending balance	37,877	43,559	41,173
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning balance	1,776	2,183	2,183
Provision for off-balance sheet credit risk	(112)	(59)
Ending balance	1,664	$ 2,124	1,776
Recorded investment [Abstract]
Collectively measured for impairment, recorded investment	3,780,208		3,735,534
Individually measured for impairment, recorded investment	22,808		28,018
Total	3,803,016		3,763,552
Related allowance [Abstract]
Collectively measured for impairment, related allowance	37,877		41,173
Individually measured for impairment, related allowance	0		0
Total	$ 37,877		$ 41,173

Loans and Allowances for Cred_4

Loans and Allowances for Credit Losses, Credit Quality Indicators (Details) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Mar. 31, 2024		Mar. 31, 2023	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	$ 898,365			$ 3,743,425
Financing Receivable, Originated, Year Two	3,482,231			4,522,989
Financing Receivable, Originated, Year Three	4,567,033			2,982,784
Financing Receivable, Originated, Year Four	2,761,053			1,756,064
Financing Receivable, Originated, Year Five	1,665,088			1,234,871
Financing Receivable, Originated, More Than Five Years	4,105,179			3,094,093
Financing Receivable, Revolving	6,668,247			6,543,149
Financing Receivable, Revolving, Converted to Term Loan	25,364			27,593
Total	24,172,560			23,904,968
Financing Receivable, Allowance for Credit Loss, Writeoff	7,060		$ 3,667
Commercial [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	692,245			2,698,113
Financing Receivable, Originated, Year Two	2,438,524			2,026,636
Financing Receivable, Originated, Year Three	1,973,600			1,293,089
Financing Receivable, Originated, Year Four	1,214,616			846,923
Financing Receivable, Originated, Year Five	806,174			576,627
Financing Receivable, Originated, More Than Five Years	2,325,449			1,839,613
Financing Receivable, Revolving	5,679,006			5,519,976
Financing Receivable, Revolving, Converted to Term Loan	3,253			2,792
Total	15,132,867			14,803,769
Financing Receivable, Allowance for Credit Loss, Writeoff	4,240		12
Commercial [Member] | Energy [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	58,061			190,122
Financing Receivable Year One Originated Current Fiscal Year Writeoff	0			0
Financing Receivable, Originated, Year Two	141,197			100,006
Financing Receivable Year Two Originated Fiscal Year Before Current Fiscal Year Writeoff	0			0
Financing Receivable, Originated, Year Three	90,222			43,769
Financing Receivable Year Three Originated Two Years Before Current Fiscal Year Writeoff	0			0
Financing Receivable, Originated, Year Four	13,033			7,876
Financing Receivable Year Four Originated Three Years Before Current Fiscal Year Writeoff	0			0
Financing Receivable, Originated, Year Five	7,447			9,562
Financing Receivable Year Five Originated Four Years Before Current Fiscal Year Writeoff	0			0
Financing Receivable, Originated, More Than Five Years	20,724			11,682
Financing Receivable Originated More than Five Years Before Current Fiscal Year Writeoff	0			0
Financing Receivable, Revolving	3,113,035			3,074,084
Financing Receivable Revolving Writeoff	0			0
Financing Receivable, Revolving, Converted to Term Loan	0			0
Financing Receivable Revolving Converted to Term Writeoff	0			0
Total	3,443,719			3,437,101
Financing Receivable, Allowance for Credit Loss, Writeoff	0			0
Commercial [Member] | Healthcare [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	165,523			650,768
Financing Receivable Year One Originated Current Fiscal Year Writeoff	0			0
Financing Receivable, Originated, Year Two	654,838			897,730
Financing Receivable Year Two Originated Fiscal Year Before Current Fiscal Year Writeoff	0			0
Financing Receivable, Originated, Year Three	924,659			609,244
Financing Receivable Year Three Originated Two Years Before Current Fiscal Year Writeoff	0			0
Financing Receivable, Originated, Year Four	593,429			467,993
Financing Receivable Year Four Originated Three Years Before Current Fiscal Year Writeoff	0			0
Financing Receivable, Originated, Year Five	441,676			355,026
Financing Receivable Year Five Originated Four Years Before Current Fiscal Year Writeoff	0			2,500
Financing Receivable, Originated, More Than Five Years	1,175,914			880,099
Financing Receivable Originated More than Five Years Before Current Fiscal Year Writeoff	502			0
Financing Receivable, Revolving	289,886			282,358
Financing Receivable Revolving Writeoff	0			0
Financing Receivable, Revolving, Converted to Term Loan	14			15
Financing Receivable Revolving Converted to Term Writeoff	0			0
Total	4,245,939			4,143,233
Financing Receivable, Allowance for Credit Loss, Writeoff	502			2,500
Commercial [Member] | Services [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	183,565			900,090
Financing Receivable Year One Originated Current Fiscal Year Writeoff	0			0
Financing Receivable, Originated, Year Two	786,684			541,573
Financing Receivable Year Two Originated Fiscal Year Before Current Fiscal Year Writeoff	0			0
Financing Receivable, Originated, Year Three	529,263			405,205
Financing Receivable Year Three Originated Two Years Before Current Fiscal Year Writeoff	0			3,060
Financing Receivable, Originated, Year Four	383,174			230,823
Financing Receivable Year Four Originated Three Years Before Current Fiscal Year Writeoff	0			0
Financing Receivable, Originated, Year Five	221,695			110,618
Financing Receivable Year Five Originated Four Years Before Current Fiscal Year Writeoff	0			0
Financing Receivable, Originated, More Than Five Years	742,303			651,745
Financing Receivable Originated More than Five Years Before Current Fiscal Year Writeoff	0			0
Financing Receivable, Revolving	681,453			735,561
Financing Receivable Revolving Writeoff	0			2,642
Financing Receivable, Revolving, Converted to Term Loan	1,284			608
Financing Receivable Revolving Converted to Term Writeoff	0			0
Total	3,529,421			3,576,223
Financing Receivable, Allowance for Credit Loss, Writeoff	0			5,702
Commercial [Member] | General business [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	285,096			957,133
Financing Receivable Year One Originated Current Fiscal Year Writeoff	0			0
Financing Receivable, Originated, Year Two	855,805			487,327
Financing Receivable Year Two Originated Fiscal Year Before Current Fiscal Year Writeoff	27			0
Financing Receivable, Originated, Year Three	429,456			234,871
Financing Receivable Year Three Originated Two Years Before Current Fiscal Year Writeoff	1,399			4,598
Financing Receivable, Originated, Year Four	224,980			140,231
Financing Receivable Year Four Originated Three Years Before Current Fiscal Year Writeoff	0			2
Financing Receivable, Originated, Year Five	135,356			101,421
Financing Receivable Year Five Originated Four Years Before Current Fiscal Year Writeoff	0			0
Financing Receivable, Originated, More Than Five Years	386,508			296,087
Financing Receivable Originated More than Five Years Before Current Fiscal Year Writeoff	158			48
Financing Receivable, Revolving	1,594,632			1,427,973
Financing Receivable Revolving Writeoff	2,154			10
Financing Receivable, Revolving, Converted to Term Loan	1,955			2,169
Financing Receivable Revolving Converted to Term Writeoff	0			38
Total	3,913,788			3,647,212
Financing Receivable, Allowance for Credit Loss, Writeoff	3,738			4,696
Commercial real estate [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	18,763			399,883
Financing Receivable Year One Originated Current Fiscal Year Writeoff	0			0
Financing Receivable, Originated, Year Two	421,936			1,942,389
Financing Receivable Year Two Originated Fiscal Year Before Current Fiscal Year Writeoff	0			0
Financing Receivable, Originated, Year Three	2,059,848			1,194,762
Financing Receivable Year Three Originated Two Years Before Current Fiscal Year Writeoff	0			0
Financing Receivable, Originated, Year Four	1,061,396			416,647
Financing Receivable Year Four Originated Three Years Before Current Fiscal Year Writeoff	0			0
Financing Receivable, Originated, Year Five	386,041			520,725
Financing Receivable Year Five Originated Four Years Before Current Fiscal Year Writeoff	0			0
Financing Receivable, Originated, More Than Five Years	1,168,870			727,146
Financing Receivable Originated More than Five Years Before Current Fiscal Year Writeoff	1,250			8,446
Financing Receivable, Revolving	119,823			136,095
Financing Receivable Revolving Writeoff	0			0
Financing Receivable, Revolving, Converted to Term Loan	0			0
Financing Receivable Revolving Converted to Term Writeoff	0			0
Total	5,236,677			5,337,647
Financing Receivable, Allowance for Credit Loss, Writeoff	1,250		2,208	8,446
Loans to individuals [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	187,357			645,429
Financing Receivable, Originated, Year Two	621,771			553,964
Financing Receivable, Originated, Year Three	533,585			494,933
Financing Receivable, Originated, Year Four	485,041			492,494
Financing Receivable, Originated, Year Five	472,873			137,519
Financing Receivable, Originated, More Than Five Years	610,860			527,334
Financing Receivable, Revolving	869,418			887,078
Financing Receivable, Revolving, Converted to Term Loan	22,111			24,801
Total	3,803,016			3,763,552
Financing Receivable, Allowance for Credit Loss, Writeoff	1,570		$ 1,447
Loans to individuals [Member] | Residential mortgage [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	96,002			426,325
Financing Receivable Year One Originated Current Fiscal Year Writeoff	0			0
Financing Receivable, Originated, Year Two	406,069			322,442
Financing Receivable Year Two Originated Fiscal Year Before Current Fiscal Year Writeoff	0			0
Financing Receivable, Originated, Year Three	319,631			343,295
Financing Receivable Year Three Originated Two Years Before Current Fiscal Year Writeoff	0			51
Financing Receivable, Originated, Year Four	337,232			351,647
Financing Receivable Year Four Originated Three Years Before Current Fiscal Year Writeoff	0			4
Financing Receivable, Originated, Year Five	343,768			55,200
Financing Receivable Year Five Originated Four Years Before Current Fiscal Year Writeoff	0			0
Financing Receivable, Originated, More Than Five Years	294,117			255,920
Financing Receivable Originated More than Five Years Before Current Fiscal Year Writeoff	2			17
Financing Receivable, Revolving	373,771			381,158
Financing Receivable Revolving Writeoff	5			0
Financing Receivable, Revolving, Converted to Term Loan	21,994			24,653
Financing Receivable Revolving Converted to Term Writeoff	0			1
Total	2,192,584			2,160,640
Financing Receivable, Allowance for Credit Loss, Writeoff	7			73
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0			633
Financing Receivable, Originated, Year Two	361			1,788
Financing Receivable, Originated, Year Three	3,012			2,220
Financing Receivable, Originated, Year Four	2,204			4,577
Financing Receivable, Originated, Year Five	4,086			6,816
Financing Receivable, Originated, More Than Five Years	129,793			133,773
Financing Receivable, Revolving	0			0
Financing Receivable, Revolving, Converted to Term Loan	0			0
Total	139,456			149,807
Loans to individuals [Member] | Personal [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	91,355			218,471
Financing Receivable Year One Originated Current Fiscal Year Writeoff	1,461	[1]		5,636	[2]
Financing Receivable, Originated, Year Two	215,341			229,734
Financing Receivable Year Two Originated Fiscal Year Before Current Fiscal Year Writeoff	40	[1]		82	[2]
Financing Receivable, Originated, Year Three	210,942			149,418
Financing Receivable Year Three Originated Two Years Before Current Fiscal Year Writeoff	45	[1]		96	[2]
Financing Receivable, Originated, Year Four	145,605			136,270
Financing Receivable Year Four Originated Three Years Before Current Fiscal Year Writeoff	12	[1]		43	[2]
Financing Receivable, Originated, Year Five	125,019			75,503
Financing Receivable Year Five Originated Four Years Before Current Fiscal Year Writeoff	0	[1]		0	[2]
Financing Receivable, Originated, More Than Five Years	186,950			137,641
Financing Receivable Originated More than Five Years Before Current Fiscal Year Writeoff	0	[1]		10	[2]
Financing Receivable, Revolving	495,647			505,920
Financing Receivable Revolving Writeoff	0	[1]		6	[2]
Financing Receivable, Revolving, Converted to Term Loan	117			148
Financing Receivable Revolving Converted to Term Writeoff	5	[1]		26	[2]
Total	1,470,976			1,453,105
Financing Receivable, Allowance for Credit Loss, Writeoff	1,563	[1]		5,899	[2]
Performing [Member] | Commercial [Member] | Energy [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	58,061			190,122
Financing Receivable, Originated, Year Two	141,197			100,006
Financing Receivable, Originated, Year Three	90,222			43,769
Financing Receivable, Originated, Year Four	13,033			7,876
Financing Receivable, Originated, Year Five	7,447			9,562
Financing Receivable, Originated, More Than Five Years	20,635			11,583
Financing Receivable, Revolving	3,067,570			3,025,590
Financing Receivable, Revolving, Converted to Term Loan	0			0
Total	3,398,165			3,388,508
Performing [Member] | Commercial [Member] | Energy [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0			0
Financing Receivable, Originated, Year Two	0			0
Financing Receivable, Originated, Year Three	0			0
Financing Receivable, Originated, Year Four	0			0
Financing Receivable, Originated, Year Five	0			0
Financing Receivable, Originated, More Than Five Years	0			0
Financing Receivable, Revolving	13,950			13,950
Financing Receivable, Revolving, Converted to Term Loan	0			0
Total	13,950			13,950
Performing [Member] | Commercial [Member] | Energy [Member] | Accruing Substandard [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0			0
Financing Receivable, Originated, Year Two	0			0
Financing Receivable, Originated, Year Three	0			0
Financing Receivable, Originated, Year Four	0			0
Financing Receivable, Originated, Year Five	0			0
Financing Receivable, Originated, More Than Five Years	0			0
Financing Receivable, Revolving	16,613			16,800
Financing Receivable, Revolving, Converted to Term Loan	0			0
Total	16,613			16,800
Performing [Member] | Commercial [Member] | Healthcare [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	165,523			650,768
Financing Receivable, Originated, Year Two	638,346			895,602
Financing Receivable, Originated, Year Three	924,230			590,736
Financing Receivable, Originated, Year Four	573,778			409,001
Financing Receivable, Originated, Year Five	382,923			331,897
Financing Receivable, Originated, More Than Five Years	1,095,684			809,858
Financing Receivable, Revolving	288,056			281,378
Financing Receivable, Revolving, Converted to Term Loan	14			15
Total	4,068,554			3,969,255
Performing [Member] | Commercial [Member] | Healthcare [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0			0
Financing Receivable, Originated, Year Two	15,000			0
Financing Receivable, Originated, Year Three	0			0
Financing Receivable, Originated, Year Four	1,254			21,791
Financing Receivable, Originated, Year Five	0			0
Financing Receivable, Originated, More Than Five Years	20,027			31,235
Financing Receivable, Revolving	855			5
Financing Receivable, Revolving, Converted to Term Loan	0			0
Total	37,136			53,031
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 Two	1,492			2,128
Financing Receivable, Originated, Year Three	429			18,508
Financing Receivable, Originated, Year Four	18,397			6,911
Financing Receivable, Originated, Year Five	58,753			0
Financing Receivable, Originated, More Than Five Years	10,896			10,896
Financing Receivable, Revolving	975			975
Financing Receivable, Revolving, Converted to Term Loan	0			0
Total	90,942			39,418
Performing [Member] | Commercial [Member] | Services [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	183,565			900,090
Financing Receivable, Originated, Year Two	786,684			526,776
Financing Receivable, Originated, Year Three	514,841			401,872
Financing Receivable, Originated, Year Four	380,227			228,818
Financing Receivable, Originated, Year Five	219,684			106,112
Financing Receivable, Originated, More Than Five Years	725,856			643,477
Financing Receivable, Revolving	677,588			730,729
Financing Receivable, Revolving, Converted to Term Loan	534			595
Total	3,488,979			3,538,469
Performing [Member] | Commercial [Member] | Services [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0			0
Financing Receivable, Originated, Year Two	0			1,085
Financing Receivable, Originated, Year Three	1,042			1,520
Financing Receivable, Originated, Year Four	1,305			1,341
Financing Receivable, Originated, Year Five	1,321			534
Financing Receivable, Originated, More Than Five Years	9,243			4,522
Financing Receivable, Revolving	31			81
Financing Receivable, Revolving, Converted to Term Loan	0			0
Total	12,942			9,083
Performing [Member] | Commercial [Member] | Services [Member] | Accruing Substandard [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0			0
Financing Receivable, Originated, Year Two	0			13,712
Financing Receivable, Originated, Year Three	13,380			178
Financing Receivable, Originated, Year Four	155			326
Financing Receivable, Originated, Year Five	341			3,972
Financing Receivable, Originated, More Than Five Years	7,204			3,746
Financing Receivable, Revolving	2,351			3,108
Financing Receivable, Revolving, Converted to Term Loan	750			13
Total	24,181			25,055
Performing [Member] | Commercial [Member] | General business [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	285,096			942,468
Financing Receivable, Originated, Year Two	845,326			436,832
Financing Receivable, Originated, Year Three	383,429			224,735
Financing Receivable, Originated, Year Four	215,106			138,951
Financing Receivable, Originated, Year Five	134,121			101,100
Financing Receivable, Originated, More Than Five Years	378,163			287,744
Financing Receivable, Revolving	1,569,156			1,389,128
Financing Receivable, Revolving, Converted to Term Loan	1,945			2,164
Total	3,812,342			3,523,122
Performing [Member] | Commercial [Member] | General business [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0			10,264
Financing Receivable, Originated, Year Two	6,110			16,167
Financing Receivable, Originated, Year Three	8,244			8,420
Financing Receivable, Originated, Year Four	8,594			1,253
Financing Receivable, Originated, Year Five	0			321
Financing Receivable, Originated, More Than Five Years	1,602			8,295
Financing Receivable, Revolving	10,611			897
Financing Receivable, Revolving, Converted to Term Loan	6			0
Total	35,167			45,617
Performing [Member] | Commercial [Member] | General business [Member] | Accruing Substandard [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0			4,401
Financing Receivable, Originated, Year Two	3,375			33,194
Financing Receivable, Originated, Year Three	37,682			1,716
Financing Receivable, Originated, Year Four	1,280			27
Financing Receivable, Originated, Year Five	1,235			0
Financing Receivable, Originated, More Than Five Years	6,701			0
Financing Receivable, Revolving	9,003			31,992
Financing Receivable, Revolving, Converted to Term Loan	0			0
Total	59,276			71,330
Performing [Member] | Commercial real estate [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	18,763			396,891
Financing Receivable, Originated, Year Two	418,504			1,941,913
Financing Receivable, Originated, Year Three	2,059,848			1,194,759
Financing Receivable, Originated, Year Four	1,061,396			416,647
Financing Receivable, Originated, Year Five	386,041			513,555
Financing Receivable, Originated, More Than Five Years	1,127,922			705,092
Financing Receivable, Revolving	119,823			136,095
Financing Receivable, Revolving, Converted to Term Loan	0			0
Total	5,192,297			5,304,952
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 Two	440			476
Financing Receivable, Originated, Year Three	0			0
Financing Receivable, Originated, Year Four	0			0
Financing Receivable, Originated, Year Five	0			0
Financing Receivable, Originated, More Than Five Years	16,527			19,171
Financing Receivable, Revolving	0			0
Financing Receivable, Revolving, Converted to Term Loan	0			0
Total	16,967			19,647
Performing [Member] | Commercial real estate [Member] | Accruing Substandard [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0			2,992
Financing Receivable, Originated, Year Two	0			0
Financing Receivable, Originated, Year Three	0			3
Financing Receivable, Originated, Year Four	0			0
Financing Receivable, Originated, Year Five	0			0
Financing Receivable, Originated, More Than Five Years	5,326			2,733
Financing Receivable, Revolving	0			0
Financing Receivable, Revolving, Converted to Term Loan	0			0
Total	5,326			5,728
Performing [Member] | Loans to individuals [Member] | Residential mortgage [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	96,002			426,089
Financing Receivable, Originated, Year Two	405,724			320,733
Financing Receivable, Originated, Year Three	319,050			342,927
Financing Receivable, Originated, Year Four	336,878			349,742
Financing Receivable, Originated, Year Five	343,246			54,801
Financing Receivable, Originated, More Than Five Years	284,962			243,356
Financing Receivable, Revolving	367,761			375,739
Financing Receivable, Revolving, Converted to Term Loan	21,386			23,895
Total	2,175,009			2,137,282
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			157
Financing Receivable, Originated, Year Two	225			140
Financing Receivable, Originated, Year Three	167			131
Financing Receivable, Originated, Year Four	3			1,361
Financing Receivable, Originated, Year Five	0			18
Financing Receivable, Originated, More Than Five Years	161			134
Financing Receivable, Revolving	3,290			2,982
Financing Receivable, Revolving, Converted to Term Loan	0			93
Total	3,846			5,016
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	0			0
Financing Receivable, Originated, Year Two	0			150
Financing Receivable, Originated, Year Three	0			0
Financing Receivable, Originated, Year Four	0			0
Financing Receivable, Originated, Year Five	0			37
Financing Receivable, Originated, More Than Five Years	0			49
Financing Receivable, Revolving	279			50
Financing Receivable, Revolving, Converted to Term Loan	1			0
Total	280			286
Performing [Member] | Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0			633
Financing Receivable, Originated, Year Two	361			1,788
Financing Receivable, Originated, Year Three	3,012			2,220
Financing Receivable, Originated, Year Four	2,204			4,297
Financing Receivable, Originated, Year Five	3,806			6,441
Financing Receivable, Originated, More Than Five Years	120,856			124,719
Financing Receivable, Revolving	0			0
Financing Receivable, Revolving, Converted to Term Loan	0			0
Total	130,239			140,098
Performing [Member] | Loans to individuals [Member] | Personal [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	91,355			218,401
Financing Receivable, Originated, Year Two	215,282			229,580
Financing Receivable, Originated, Year Three	210,876			149,291
Financing Receivable, Originated, Year Four	145,542			136,215
Financing Receivable, Originated, Year Five	124,996			75,348
Financing Receivable, Originated, More Than Five Years	186,791			137,629
Financing Receivable, Revolving	493,653			503,841
Financing Receivable, Revolving, Converted to Term Loan	100			145
Total	1,468,595			1,450,450
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			66
Financing Receivable, Originated, Year Two	28			39
Financing Receivable, Originated, Year Three	13			106
Financing Receivable, Originated, Year Four	51			30
Financing Receivable, Originated, Year Five	13			8
Financing Receivable, Originated, More Than Five Years	3			0
Financing Receivable, Revolving	0			1,918
Financing Receivable, Revolving, Converted to Term Loan	0			3
Total	108			2,170
Performing [Member] | Loans to individuals [Member] | Personal [Member] | Accruing Substandard [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0			0
Financing Receivable, Originated, Year Two	0			64
Financing Receivable, Originated, Year Three	24			12
Financing Receivable, Originated, Year Four	0			9
Financing Receivable, Originated, Year Five	1			144
Financing Receivable, Originated, More Than Five Years	144			0
Financing Receivable, Revolving	1,962			3
Financing Receivable, Revolving, Converted to Term Loan	0			0
Total	2,131			232
Nonperforming Financial Instruments [Member] | Commercial [Member] | Energy [Member] | Nonaccrual [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0			0
Financing Receivable, Originated, Year Two	0			0
Financing Receivable, Originated, Year Three	0			0
Financing Receivable, Originated, Year Four	0			0
Financing Receivable, Originated, Year Five	0			0
Financing Receivable, Originated, More Than Five Years	89			99
Financing Receivable, Revolving	14,902			17,744
Financing Receivable, Revolving, Converted to Term Loan	0			0
Total	14,991			17,843
Nonperforming Financial Instruments [Member] | Commercial [Member] | Healthcare [Member] | Nonaccrual [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0			0
Financing Receivable, Originated, Year Two	0			0
Financing Receivable, Originated, Year Three	0			0
Financing Receivable, Originated, Year Four	0			30,290
Financing Receivable, Originated, Year Five	0			23,129
Financing Receivable, Originated, More Than Five Years	49,307			28,110
Financing Receivable, Revolving	0			0
Financing Receivable, Revolving, Converted to Term Loan	0			0
Total	49,307			81,529
Nonperforming Financial Instruments [Member] | Commercial [Member] | Services [Member] | Nonaccrual [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0			0
Financing Receivable, Originated, Year Two	0			0
Financing Receivable, Originated, Year Three	0			1,635
Financing Receivable, Originated, Year Four	1,487			338
Financing Receivable, Originated, Year Five	349			0
Financing Receivable, Originated, More Than Five Years	0			0
Financing Receivable, Revolving	1,483			1,643
Financing Receivable, Revolving, Converted to Term Loan	0			0
Total	3,319			3,616
Nonperforming Financial Instruments [Member] | Commercial [Member] | General business [Member] | Nonaccrual [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0			0
Financing Receivable, Originated, Year Two	994			1,134
Financing Receivable, Originated, Year Three	101			0
Financing Receivable, Originated, Year Four	0			0
Financing Receivable, Originated, Year Five	0			0
Financing Receivable, Originated, More Than Five Years	42			48
Financing Receivable, Revolving	5,862			5,956
Financing Receivable, Revolving, Converted to Term Loan	4			5
Total	7,003			7,143
Nonperforming Financial Instruments [Member] | Commercial real estate [Member] | Nonaccrual [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0			0
Financing Receivable, Originated, Year Two	2,992			0
Financing Receivable, Originated, Year Three	0			0
Financing Receivable, Originated, Year Four	0			0
Financing Receivable, Originated, Year Five	0			7,170
Financing Receivable, Originated, More Than Five Years	19,095			150
Financing Receivable, Revolving	0			0
Financing Receivable, Revolving, Converted to Term Loan	0			0
Total	22,087			7,320
Nonperforming Financial Instruments [Member] | Loans to individuals [Member] | Residential mortgage [Member] | Nonaccrual [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0			79
Financing Receivable, Originated, Year Two	120			1,419
Financing Receivable, Originated, Year Three	414			237
Financing Receivable, Originated, Year Four	351			544
Financing Receivable, Originated, Year Five	522			344
Financing Receivable, Originated, More Than Five Years	8,994			12,381
Financing Receivable, Revolving	2,441			2,387
Financing Receivable, Revolving, Converted to Term Loan	607			665
Total	13,449			18,056
Nonperforming Financial Instruments [Member] | Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans [Member] | Nonaccrual [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0			0
Financing Receivable, Originated, Year Two	0			0
Financing Receivable, Originated, Year Three	0			0
Financing Receivable, Originated, Year Four	0			280
Financing Receivable, Originated, Year Five	280			375
Financing Receivable, Originated, More Than Five Years	8,937			9,054
Financing Receivable, Revolving	0			0
Financing Receivable, Revolving, Converted to Term Loan	0			0
Total	9,217			9,709
Nonperforming Financial Instruments [Member] | Loans to individuals [Member] | Personal [Member] | Nonaccrual [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0			4
Financing Receivable, Originated, Year Two	31			51
Financing Receivable, Originated, Year Three	29			9
Financing Receivable, Originated, Year Four	12			16
Financing Receivable, Originated, Year Five	9			3
Financing Receivable, Originated, More Than Five Years	12			12
Financing Receivable, Revolving	32			158
Financing Receivable, Revolving, Converted to Term Loan	17			0
Total	$ 142			$ 253
[1] Includes charge-offs on deposit overdrafts, which are generally charged off at 60 days past due. Includes charge-offs on deposit overdrafts, which are generally charged off at 60 days past due.

Loans and Allowances for Cred_5

Loans and Allowances for Credit Losses Loans and Allowances for Credit Losses, Nonaccrual (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	$ 119,515	$ 145,469
Financing Receivable, Nonaccrual, No Allowance	77,458	102,380
Financing Receivable, Nonaccrual, With Allowance	42,057	43,089
Financing Receivable, Nonaccrual, Related Allowance	2,960	2,692
Commercial [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	74,620	110,131
Financing Receivable, Nonaccrual, No Allowance	32,563	67,042
Financing Receivable, Nonaccrual, With Allowance	42,057	43,089
Financing Receivable, Nonaccrual, Related Allowance	2,960	2,692
Commercial [Member] | Healthcare [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	49,307	81,529
Financing Receivable, Nonaccrual, No Allowance	9,668	40,372
Financing Receivable, Nonaccrual, With Allowance	39,639	41,157
Financing Receivable, Nonaccrual, Related Allowance	2,100	1,478
Commercial [Member] | Services [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	3,319	3,616
Financing Receivable, Nonaccrual, No Allowance	1,542	1,684
Financing Receivable, Nonaccrual, With Allowance	1,777	1,932
Financing Receivable, Nonaccrual, Related Allowance	460	1,214
Commercial [Member] | Energy [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	14,991	17,843
Financing Receivable, Nonaccrual, No Allowance	14,991	17,843
Financing Receivable, Nonaccrual, With Allowance	0	0
Financing Receivable, Nonaccrual, Related Allowance	0	0
Commercial [Member] | General business [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	7,003	7,143
Financing Receivable, Nonaccrual, No Allowance	6,362	7,143
Financing Receivable, Nonaccrual, With Allowance	641	0
Financing Receivable, Nonaccrual, Related Allowance	400	0
Commercial real estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	22,087	7,320
Financing Receivable, Nonaccrual, No Allowance	22,087	7,320
Financing Receivable, Nonaccrual, With Allowance	0	0
Financing Receivable, Nonaccrual, Related Allowance	0	0
Loans to individuals [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	22,808	28,018
Financing Receivable, Nonaccrual, No Allowance	22,808	28,018
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	13,449	18,056
Financing Receivable, Nonaccrual, No Allowance	13,449	18,056
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	142	253
Financing Receivable, Nonaccrual, No Allowance	142	253
Financing Receivable, Nonaccrual, With Allowance	0	0
Financing Receivable, Nonaccrual, Related Allowance	0	0
US Government Agency Insured Loans [Member] | Loans to individuals [Member] | Residential mortgage [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	9,217	9,709
Financing Receivable, Nonaccrual, No Allowance	9,217	9,709
Financing Receivable, Nonaccrual, With Allowance	0	0
Financing Receivable, Nonaccrual, Related Allowance	$ 0	$ 0

Loans and Allowances for Cred_6

Loans and Allowances for Credit Losses, Modifications (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Financing Receivable, Loan Modifications [Line Items]
Financing Receivable, Modified in Period, Amount	$ 52,000	$ 35,000
Number of Days Past Due Following Modification to be Considered a Payment Default	30 days
Loans to individuals [Member] | Extended Maturity and Interest Rate Reduction
Financing Receivable, Loan Modifications [Line Items]
Financing Receivable, Modified in Period, Amount	$ 1,800
Healthcare [Member] | Commercial [Member]
Financing Receivable, Loan Modifications [Line Items]
Financing Receivable, Modified in Period, Amount	47,000	26,000
Healthcare, Services and General business member | Extended Maturity
Financing Receivable, Loan Modifications [Line Items]
Financing Receivable, Modified in Period, Amount	51,000
US Government Agency Insured Loans [Member] | Residential Mortgage [Member] | Loans to individuals [Member]
Financing Receivable, Loan Modifications [Line Items]
Financing Receivable, Modified in Period, Amount		8,400
Financing Receivable, Modified, Subsequent Default	$ 4,200	$ 511

Loans and Allowances for Cred_7

Loans and Allowances for Credit Losses, By Aging Category (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, Past Due [Line Items]
Past Due 90 Days or More and Accruing	$ 41,364	$ 48,371
Current and Past Due Performing Loans	24,172,560	23,904,968
30 to 59 Days [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	45,406	55,411
60 to 89 Days [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	16,070	50,082
90 Days or More [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	103,691	93,644
Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	24,007,393	23,705,831
Commercial [Member]
Financing Receivable, Past Due [Line Items]
Past Due 90 Days or More and Accruing	0	0
Current and Past Due Performing Loans	15,132,867	14,803,769
Commercial [Member] | 30 to 59 Days [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	2,539	18,433
Commercial [Member] | 60 to 89 Days [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	229	31,447
Commercial [Member] | 90 Days or More [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	46,230	29,890
Commercial [Member] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	15,083,869	14,723,999
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	3,443,719	3,437,101
Commercial [Member] | Energy [Member] | 30 to 59 Days [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	0	0
Commercial [Member] | Energy [Member] | 60 to 89 Days [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	0	0
Commercial [Member] | Energy [Member] | 90 Days or More [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	0	0
Commercial [Member] | Energy [Member] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	3,443,719	3,437,101
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	4,245,939	4,143,233
Commercial [Member] | Healthcare [Member] | 30 to 59 Days [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	0	18,019
Commercial [Member] | Healthcare [Member] | 60 to 89 Days [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	0	30,290
Commercial [Member] | Healthcare [Member] | 90 Days or More [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	39,626	23,588
Commercial [Member] | Healthcare [Member] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	4,206,313	4,071,336
Commercial [Member] | Services [Member]
Financing Receivable, Past Due [Line Items]
Past Due 90 Days or More and Accruing	0	0
Current and Past Due Performing Loans	3,529,421	3,576,223
Commercial [Member] | Services [Member] | 30 to 59 Days [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	485	2
Commercial [Member] | Services [Member] | 60 to 89 Days [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	20	0
Commercial [Member] | Services [Member] | 90 Days or More [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	349	434
Commercial [Member] | Services [Member] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	3,528,567	3,575,787
Commercial [Member] | General business [Member]
Financing Receivable, Past Due [Line Items]
Past Due 90 Days or More and Accruing	0	0
Current and Past Due Performing Loans	3,913,788	3,647,212
Commercial [Member] | General business [Member] | 30 to 59 Days [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	2,054	412
Commercial [Member] | General business [Member] | 60 to 89 Days [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	209	1,157
Commercial [Member] | General business [Member] | 90 Days or More [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	6,255	5,868
Commercial [Member] | General business [Member] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	3,905,270	3,639,775
Commercial real estate [Member]
Financing Receivable, Past Due [Line Items]
Past Due 90 Days or More and Accruing	0	3
Current and Past Due Performing Loans	5,236,677	5,337,647
Commercial real estate [Member] | 30 to 59 Days [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	11,800	2,992
Commercial real estate [Member] | 60 to 89 Days [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	0	0
Commercial real estate [Member] | 90 Days or More [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	10,140	7,174
Commercial real estate [Member] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	5,214,737	5,327,481
Loans to individuals [Member]
Financing Receivable, Past Due [Line Items]
Past Due 90 Days or More and Accruing	41,364	48,368
Current and Past Due Performing Loans	3,803,016	3,763,552
Loans to individuals [Member] | 30 to 59 Days [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	31,067	33,986
Loans to individuals [Member] | 60 to 89 Days [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	15,841	18,635
Loans to individuals [Member] | 90 Days or More [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	47,321	56,580
Loans to individuals [Member] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	3,708,787	3,654,351
Loans to individuals [Member] | Residential mortgage [Member]
Financing Receivable, Past Due [Line Items]
Past Due 90 Days or More and Accruing	0	36
Current and Past Due Performing Loans	2,192,584	2,160,640
Loans to individuals [Member] | Residential mortgage [Member] | 30 to 59 Days [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	7,139	6,340
Loans to individuals [Member] | Residential mortgage [Member] | 60 to 89 Days [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	737	1,494
Loans to individuals [Member] | Residential mortgage [Member] | 90 Days or More [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	1,681	2,879
Loans to individuals [Member] | Residential mortgage [Member] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	2,183,027	2,149,927
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans [Member]
Financing Receivable, Past Due [Line Items]
Past Due 90 Days or More and Accruing	41,364	48,201
Current and Past Due Performing Loans	139,456	149,807
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans [Member] | 30 to 59 Days [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	22,873	25,085
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans [Member] | 60 to 89 Days [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	15,080	17,053
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans [Member] | 90 Days or More [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	45,617	53,547
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans [Member] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	55,886	54,122
Loans to individuals [Member] | Personal [Member]
Financing Receivable, Past Due [Line Items]
Past Due 90 Days or More and Accruing	0	131
Current and Past Due Performing Loans	1,470,976	1,453,105
Loans to individuals [Member] | Personal [Member] | 30 to 59 Days [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	1,055	2,561
Loans to individuals [Member] | Personal [Member] | 60 to 89 Days [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	24	88
Loans to individuals [Member] | Personal [Member] | 90 Days or More [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	23	154
Loans to individuals [Member] | Personal [Member] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	$ 1,469,874	$ 1,450,302

Mortgage Banking Activities, Co

Mortgage Banking Activities, Components of Loans Held For Sale (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Schedule of Residential Mortgage Loans Held For Sale [Line Items]
Residential mortgage loans held for sale, nonperforming	$ 0		$ 0
Number of days for past due for loan to be considered nonperforming (in days)	90 days		90 days
Credit losses recognized on residential mortgage loans held for sale	$ 0	$ 0
Components of Residential Mortgage Loans Held for Sale [Abstract]
Unpaid principal balance	73,937		$ 56,922
Residential mortgage loans held for sale, Fair value	73,090		56,457
Residential mortgage loans held for sale	$ 75,449		$ 56,935
Residential Mortgage Loan Commitments [Member] | Not Designated as Hedging Instrument [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	$ 67,951		$ 34,783
Derivative, Net fair value	$ 2,473		$ 1,379
Forward sales contracts [Member] | Not Designated as Hedging Instrument [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 for 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	$ 108,070		$ 75,448
Derivative, Net fair value	$ (114)		$ (901)

Mortgage Banking Activities Mor

Mortgage Banking Activities Mortgage Banking Activities, Mortgage Banking Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Mortgage Banking Revenue [Abstract]
Net realized gains (losses) on sale of mortgage loans	$ 2,026	$ (1,731)
Net change in unrealized gain (loss) on mortgage loans held for sale	(382)	370
Net change in the fair value of mortgage loan commitments	1,094	1,640
Net change in the fair value of forward sales contracts	787	(912)
Total production revenue (loss)	3,525	(633)
Servicing revenue	15,442	15,000
Total mortgage banking revenue	$ 18,967	$ 14,367

Mortgage Banking Activities, Mo

Mortgage Banking Activities, Mortgage Servicing Rights (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)
Summary of Mortgage Servicing Rights [Abstract]
Number of residential mortgage loans serviced for others	122,276		115,967
Outstanding principal balance of residential mortgage loans serviced for others	$ 21,432,048,000		$ 20,382,192,000
Weighted average interest rate	3.66%		3.64%
Remaining term (in months)	278 months		280 months
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance	$ 293,884,000	$ 277,608,000	$ 277,608,000
Additions	2,516,000	2,500,000
Acquisitions	17,400,000	31,138,000
Changes due to principal payments	(5,447,000)	(5,384,000)
Change in fair value due to market assumption changes	10,977,000	(6,059,000)
Ending balance	$ 319,330,000	$ 299,803,000	$ 293,884,000
Servicing Assets at Fair Value, Assumptions Used to Estimate Fair Value [Abstract]
Discount rate - risk-free rate plus a market premium (in hundredths)	9.82%		9.72%
Prepayment rate - based upon loan interest rate, original term and loan type	6.83%		7.34%
Loan servicing costs - annually per loan based upon loan type, performing, minimum (in dollars per loan)	$ 73		$ 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)	875		875
Loan servicing costs - annually per loan based upon loan type, foreclosure, maximum (in dollars per loan)	$ 8,000		$ 8,000
Escrow earnings rate - indexed to rates paid on deposit accounts with comparable average life (in hundredths)	4.27%		3.90%
Primary secondary mortgage rate spread	115		105
Delinquency rate	2.06%		2.06%

Commitments and Contingent Li_2

Commitments and Contingent Liabilities (Details) - USD ($) $ in Millions		3 Months Ended
	Apr. 08, 2024	Mar. 31, 2024
Bank Participation in Fraudulent Sale of Securities by Principals [Member] | Pending Litigation [Member]
Litigation Settlement [Abstract]
Outstanding principal accrued interest and other amounts upon sale of facilities securing payment of the bonds		$ 33
Loss Contingency, Damages Sought, Value		$ 3
Subsequent Event [Member]
Loss Contingencies [Line Items]
Potential Exchange Offer Program Conversion Percentage	50%
Visa Membership
Loss Contingencies [Line Items]
Common Stock Class B Shares Owned		252,233

Commitments and Contingent Li_3

Commitments and Contingent Liabilities Variable Interest Entities (Details) $ in Millions	Mar. 31, 2024 USD ($)
Other Assets [Member]
Variable Interest Entity [Line Items]
Amortization Method Qualified Affordable Housing Project Investments	$ 405
Other Liabilities [Member]
Variable Interest Entity [Line Items]
Qualified Affordable Housing Project Investments, Commitment	$ 99

Shareholders' Equity (Details)

Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
	Apr. 30, 2024	Mar. 31, 2024	Mar. 31, 2023
Dividends declared (in dollars per share)		$ 0.55	$ 0.54
Schedule of Accumulated Other Income (Loss) [Abstract]
Balance, Beginning of Period		$ (599,100)	$ (836,955)
Net change in unrealized gain (loss)		(71,806)	124,045
Interest revenue, Investment securities		12,183	16,051
Loss on available for sale securities, net		45,171	0
Other comprehensive income, before income taxes		(14,452)	140,096
Federal and state income taxes		(3,424)	31,695
Other comprehensive income, net of income taxes		(11,028)	108,401
Balance, End of Period		(610,128)	(728,554)
Accumulated Net Unrealized Gain (Loss) on Available for Sale Securities [Member]
Schedule of Accumulated Other Income (Loss) [Abstract]
Balance, Beginning of Period		(473,212)	(664,618)
Net change in unrealized gain (loss)		(71,806)	124,045
Interest revenue, Investment securities		0	0
Loss on available for sale securities, net		45,171
Other comprehensive income, before income taxes		(26,635)	124,045
Federal and state income taxes		(6,289)	28,179
Other comprehensive income, net of income taxes		(20,346)	95,866
Balance, End of Period		(493,558)	(568,752)
AOCI, Accumulated Gain (Loss), Debt Securities, Investment Securities Transferred from Available-for-sale, Parent
Schedule of Accumulated Other Income (Loss) [Abstract]
Balance, Beginning of Period		(125,888)	(172,337)
Net change in unrealized gain (loss)		0	0
Interest revenue, Investment securities		12,183	16,051
Loss on available for sale securities, net		0
Other comprehensive income, before income taxes		12,183	16,051
Federal and state income taxes		2,865	3,516
Other comprehensive income, net of income taxes		9,318	12,535
Balance, End of Period		$ (116,570)	$ (159,802)
Subsequent Event [Member]
Dividends Payable, Date Declared	Apr. 30, 2024
Dividends declared (in dollars per share)	$ 0.55
Dividends Payable, Date to be Paid	May 30, 2024
Dividends Payable, Date of Record	May 15, 2024

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Numerator: [Abstract]
Net income attributable to BOK Financial Corp. shareholders	$ 83,703	$ 162,368
Less: Earnings allocated to participating securities	676	1,255
Numerator for basic earnings per share – income available to common shareholders	83,027	161,113
Effect of reallocating undistributed earnings of participating securities	0	0
Numerator for diluted earnings per share – income available to common shareholders	$ 83,027	$ 161,113
Denominator: [Abstract]
Weighted average shares outstanding (in shares)	64,812,555	66,849,288
Less: Participating securities included in weighted average shares (in shares)	522,450	517,513
Denominator for basic earnings per common share (in shares)	64,290,105	66,331,775
Dilutive effect of employee stock compensation plans (in shares)	0	0
Denominator for diluted earnings per common share (in shares)	64,290,105	66,331,775
Basic earnings per share	$ 1.29	$ 2.43
Diluted earnings per share	$ 1.29	$ 2.43

Reportable Segments (Details)

Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Net interest revenue from external sources	$ 293,572	$ 352,348
Net interest revenue (expense) from internal sources	0	0
Net interest revenue	293,572	352,348
Net loans charged off and provisions for credit losses	8,000	16,000
Net interest revenue after provision for credit losses	285,572	336,348
Other operating revenue	161,701	177,865
Other operating expense	340,384	305,812
Net direct contribution	106,889	208,401
Gain (loss) on financial instruments, net	0	0
Change in fair value of mortgage servicing rights	0	0
Gain (loss) on repossessed assets, net	0	0
Corporate expense allocations	0	0
Net income before taxes	106,889	208,401
Federal and state income taxes	23,195	45,905
Net income	83,694	162,496
Net income (loss) attributable to non-controlling interests	(9)	128
Net income attributable to BOK Financial Corp. shareholders	83,703	162,368
Average assets	50,027,572	45,982,468
Operating Segments [Member] | Commercial [Member]
Segment Reporting Information [Line Items]
Net interest revenue from external sources	282,447	287,988
Net interest revenue (expense) from internal sources	(37,326)	(3,932)
Net interest revenue	245,121	284,056
Net loans charged off and provisions for credit losses	4,160	76
Net interest revenue after provision for credit losses	240,961	283,980
Other operating revenue	50,006	56,845
Other operating expense	70,095	73,134
Net direct contribution	220,872	267,691
Gain (loss) on financial instruments, net	167	(58)
Change in fair value of mortgage servicing rights	0	0
Gain (loss) on repossessed assets, net	0	859
Corporate expense allocations	18,397	17,718
Net income before taxes	202,642	250,774
Federal and state income taxes	49,392	60,543
Net income	153,250	190,231
Net income (loss) attributable to non-controlling interests	0	0
Net income attributable to BOK Financial Corp. shareholders	153,250	190,231
Average assets	29,806,817	28,162,934
Operating Segments [Member] | Consumer [Member]
Segment Reporting Information [Line Items]
Net interest revenue from external sources	7,350	21,146
Net interest revenue (expense) from internal sources	94,799	88,235
Net interest revenue	102,149	109,381
Net loans charged off and provisions for credit losses	1,808	1,184
Net interest revenue after provision for credit losses	100,341	108,197
Other operating revenue	36,207	30,610
Other operating expense	53,447	50,198
Net direct contribution	83,101	88,609
Gain (loss) on financial instruments, net	(9,663)	(4,673)
Change in fair value of mortgage servicing rights	10,977	(6,059)
Gain (loss) on repossessed assets, net	107	14
Corporate expense allocations	14,172	11,622
Net income before taxes	70,350	66,269
Federal and state income taxes	16,546	15,586
Net income	53,804	50,683
Net income (loss) attributable to non-controlling interests	0	0
Net income attributable to BOK Financial Corp. shareholders	53,804	50,683
Average assets	9,391,981	9,934,511
Operating Segments [Member] | Wealth Management [Member]
Segment Reporting Information [Line Items]
Net interest revenue from external sources	6,999	20,940
Net interest revenue (expense) from internal sources	33,110	33,166
Net interest revenue	40,109	54,106
Net loans charged off and provisions for credit losses	(15)	(24)
Net interest revenue after provision for credit losses	40,124	54,130
Other operating revenue	118,704	108,911
Other operating expense	99,535	82,039
Net direct contribution	59,293	81,002
Gain (loss) on financial instruments, net	0	0
Change in fair value of mortgage servicing rights	0	0
Gain (loss) on repossessed assets, net	0	0
Corporate expense allocations	14,558	12,360
Net income before taxes	44,735	68,642
Federal and state income taxes	10,570	16,195
Net income	34,165	52,447
Net income (loss) attributable to non-controlling interests	0	0
Net income attributable to BOK Financial Corp. shareholders	34,165	52,447
Average assets	15,759,328	11,663,096
Funds Management and Other [Member]
Segment Reporting Information [Line Items]
Net interest revenue from external sources	(3,224)	22,274
Net interest revenue (expense) from internal sources	(90,583)	(117,469)
Net interest revenue	(93,807)	(95,195)
Net loans charged off and provisions for credit losses	2,047	14,764
Net interest revenue after provision for credit losses	(95,854)	(109,959)
Other operating revenue	(43,216)	(18,501)
Other operating expense	117,307	100,441
Net direct contribution	(256,377)	(228,901)
Gain (loss) on financial instruments, net	9,496	4,731
Change in fair value of mortgage servicing rights	(10,977)	6,059
Gain (loss) on repossessed assets, net	(107)	(873)
Corporate expense allocations	(47,127)	(41,700)
Net income before taxes	(210,838)	(177,284)
Federal and state income taxes	(53,313)	(46,419)
Net income	(157,525)	(130,865)
Net income (loss) attributable to non-controlling interests	(9)	128
Net income attributable to BOK Financial Corp. shareholders	(157,516)	(130,993)
Average assets	$ (4,930,554)	$ (3,778,073)

Fees and Commissions Revenue _3

Fees and Commissions Revenue Fees and Commissions (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2024		Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Total fees and commissions		$ 200,564		$ 185,979
Fees and commissions revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		200,564		185,979
Fees and commission revenue not from contracts with customers		73,755	[1]	62,477	[2]
Fees and commissions revenue from contracts with customers		126,809	[3]	123,502	[4]
Brokerage and trading revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		59,179		52,396
Fees and commission revenue not from contracts with customers		46,876	[1]	39,550	[2]
Fees and commissions revenue from contracts with customers		12,303	[3]	12,846	[4]
Trading revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		37,457		27,598
Fees and commission revenue not from contracts with customers		37,457	[1]	27,598	[2]
Fees and commissions revenue from contracts with customers		0	[3]	0	[4]
Customer hedging revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		6,325		8,354
Fees and commission revenue not from contracts with customers		6,325	[1]	8,354	[2]
Fees and commissions revenue from contracts with customers		0	[3]	0	[4]
Retail brokerage revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		4,693		3,844
Fees and commission revenue not from contracts with customers		0	[1]	0	[2]
Fees and commissions revenue from contracts with customers		4,693	[3]	3,844	[4]
Insurance brokerage revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions				3,306
Fees and commission revenue not from contracts with customers	[2]			0
Fees and commissions revenue from contracts with customers	[4]			3,306
Investment banking revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		10,704		9,294
Fees and commission revenue not from contracts with customers		3,094	[1]	3,598	[2]
Fees and commissions revenue from contracts with customers		7,610	[3]	5,696	[4]
Transaction card revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		25,493		25,621
Fees and commission revenue not from contracts with customers		0	[1]	0	[2]
Fees and commissions revenue from contracts with customers		25,493	[3]	25,621	[4]
TransFund EFT network revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		21,274		21,392
Fees and commission revenue not from contracts with customers		0	[1]	0	[2]
Fees and commissions revenue from contracts with customers		21,274	[3]	21,392	[4]
Merchant services revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		2,189		2,158
Fees and commission revenue not from contracts with customers		0	[1]	0	[2]
Fees and commissions revenue from contracts with customers		2,189	[3]	2,158	[4]
Corporate card revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		2,030		2,071
Fees and commission revenue not from contracts with customers		0	[1]	0	[2]
Fees and commissions revenue from contracts with customers		2,030	[3]	2,071	[4]
Fiduciary and asset management revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		55,305		50,657
Fees and commission revenue not from contracts with customers		0	[1]	0	[2]
Fees and commissions revenue from contracts with customers		55,305	[3]	50,657	[4]
Personal trust revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		24,345		23,527
Fees and commission revenue not from contracts with customers		0	[1]	0	[2]
Fees and commissions revenue from contracts with customers		24,345	[3]	23,527	[4]
Corporate trust revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		9,260		7,660
Fees and commission revenue not from contracts with customers		0	[1]	0	[2]
Fees and commissions revenue from contracts with customers		9,260	[3]	7,660	[4]
Institutional trust & retirement plan services revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		16,148		13,253
Fees and commission revenue not from contracts with customers		0	[1]	0	[2]
Fees and commissions revenue from contracts with customers		16,148	[3]	13,253	[4]
Investment management services and other revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		5,552		6,217
Fees and commission revenue not from contracts with customers		0	[1]	0	[2]
Fees and commissions revenue from contracts with customers		5,552	[3]	6,217	[4]
Deposit service charges and fees [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		28,685		25,968
Fees and commission revenue not from contracts with customers		0	[1]	0	[2]
Fees and commissions revenue from contracts with customers		28,685	[3]	25,968	[4]
Commercial account service charge revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		15,977		13,847
Fees and commission revenue not from contracts with customers		0	[1]	0	[2]
Fees and commissions revenue from contracts with customers		15,977	[3]	13,847	[4]
Overdraft fee revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		5,460		4,873
Fees and commission revenue not from contracts with customers		0	[1]	0	[2]
Fees and commissions revenue from contracts with customers		5,460	[3]	4,873	[4]
Check card revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		5,670		5,639
Fees and commission revenue not from contracts with customers		0	[1]	0	[2]
Fees and commissions revenue from contracts with customers		5,670	[3]	5,639	[4]
Automated service charge and other deposit fee revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		1,578		1,609
Fees and commission revenue not from contracts with customers		0	[1]	0	[2]
Fees and commissions revenue from contracts with customers		1,578	[3]	1,609	[4]
Mortgage banking revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		18,967		14,367
Fees and commission revenue not from contracts with customers		18,967	[1]	14,367	[2]
Fees and commissions revenue from contracts with customers		0	[3]	0	[4]
Mortgage production revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		3,525		(633)
Fees and commission revenue not from contracts with customers		3,525	[1]	(633)	[2]
Fees and commissions revenue from contracts with customers		0	[3]	0	[4]
Mortgage servicing revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		15,442		15,000
Fees and commission revenue not from contracts with customers		15,442	[1]	15,000	[2]
Fees and commissions revenue from contracts with customers		0	[3]	0	[4]
Other revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		12,935		16,970
Fees and commission revenue not from contracts with customers		7,912	[1]	8,560	[2]
Fees and commissions revenue from contracts with customers		5,023	[3]	8,410	[4]
Operating Segments [Member] | Commercial [Member] | Fees and commissions revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		50,630		55,835
Operating Segments [Member] | Commercial [Member] | Brokerage and trading revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		7,562		10,185
Operating Segments [Member] | Commercial [Member] | Trading revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		0		0
Operating Segments [Member] | Commercial [Member] | Customer hedging revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		3,743		6,487
Operating Segments [Member] | Commercial [Member] | Retail brokerage revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		0		0
Operating Segments [Member] | Commercial [Member] | Insurance brokerage revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions				0
Operating Segments [Member] | Commercial [Member] | Investment banking revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		3,819		3,698
Operating Segments [Member] | Commercial [Member] | Transaction card revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		24,384		24,434
Operating Segments [Member] | Commercial [Member] | TransFund EFT network revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		20,466		20,499
Operating Segments [Member] | Commercial [Member] | Merchant services revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		2,180		2,150
Operating Segments [Member] | Commercial [Member] | Corporate card revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		1,738		1,785
Operating Segments [Member] | Commercial [Member] | Fiduciary and asset management revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		0		0
Operating Segments [Member] | Commercial [Member] | Personal trust revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		0		0
Operating Segments [Member] | Commercial [Member] | Corporate trust revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		0		0
Operating Segments [Member] | Commercial [Member] | Institutional trust & retirement plan services revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		0		0
Operating Segments [Member] | Commercial [Member] | Investment management services and other revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		0		0
Operating Segments [Member] | Commercial [Member] | Deposit service charges and fees [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		15,205		13,133
Operating Segments [Member] | Commercial [Member] | Commercial account service charge revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		14,900		12,871
Operating Segments [Member] | Commercial [Member] | Overdraft fee revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		36		25
Operating Segments [Member] | Commercial [Member] | Check card revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		0		0
Operating Segments [Member] | Commercial [Member] | Automated service charge and other deposit fee revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		269		237
Operating Segments [Member] | Commercial [Member] | Mortgage banking revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		0		0
Operating Segments [Member] | Commercial [Member] | Mortgage production revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		0		0
Operating Segments [Member] | Commercial [Member] | Mortgage servicing revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		0		0
Operating Segments [Member] | Commercial [Member] | Other revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		3,479		8,083
Operating Segments [Member] | Consumer [Member] | Fees and commissions revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		36,207		30,581
Operating Segments [Member] | Consumer [Member] | Brokerage and trading revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		0		0
Operating Segments [Member] | Consumer [Member] | Trading revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		0		0
Operating Segments [Member] | Consumer [Member] | Customer hedging revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		0		0
Operating Segments [Member] | Consumer [Member] | Retail brokerage revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		0		0
Operating Segments [Member] | Consumer [Member] | Insurance brokerage revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions				0
Operating Segments [Member] | Consumer [Member] | Investment banking revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		0		0
Operating Segments [Member] | Consumer [Member] | Transaction card revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		835		916
Operating Segments [Member] | Consumer [Member] | TransFund EFT network revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		826		908
Operating Segments [Member] | Consumer [Member] | Merchant services revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		9		8
Operating Segments [Member] | Consumer [Member] | Corporate card revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		0		0
Operating Segments [Member] | Consumer [Member] | Fiduciary and asset management revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		0		0
Operating Segments [Member] | Consumer [Member] | Personal trust revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		0		0
Operating Segments [Member] | Consumer [Member] | Corporate trust revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		0		0
Operating Segments [Member] | Consumer [Member] | Institutional trust & retirement plan services revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		0		0
Operating Segments [Member] | Consumer [Member] | Investment management services and other revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		0		0
Operating Segments [Member] | Consumer [Member] | Deposit service charges and fees [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		12,831		12,278
Operating Segments [Member] | Consumer [Member] | Commercial account service charge revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		531		499
Operating Segments [Member] | Consumer [Member] | Overdraft fee revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		5,394		4,828
Operating Segments [Member] | Consumer [Member] | Check card revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		5,670		5,638
Operating Segments [Member] | Consumer [Member] | Automated service charge and other deposit fee revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		1,236		1,313
Operating Segments [Member] | Consumer [Member] | Mortgage banking revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		19,640		14,925
Operating Segments [Member] | Consumer [Member] | Mortgage production revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		3,525		(633)
Operating Segments [Member] | Consumer [Member] | Mortgage servicing revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		16,115		15,558
Operating Segments [Member] | Consumer [Member] | Other revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		2,901		2,462
Operating Segments [Member] | Wealth Management [Member] | Fees and commissions revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		118,704		108,911
Operating Segments [Member] | Wealth Management [Member] | Brokerage and trading revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		51,055		40,444
Operating Segments [Member] | Wealth Management [Member] | Trading revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		37,457		27,598
Operating Segments [Member] | Wealth Management [Member] | Customer hedging revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		2,020		100
Operating Segments [Member] | Wealth Management [Member] | Retail brokerage revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		4,693		3,844
Operating Segments [Member] | Wealth Management [Member] | Insurance brokerage revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions				3,306
Operating Segments [Member] | Wealth Management [Member] | Investment banking revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		6,885		5,596
Operating Segments [Member] | Wealth Management [Member] | Transaction card revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		161		160
Operating Segments [Member] | Wealth Management [Member] | TransFund EFT network revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		(18)		(17)
Operating Segments [Member] | Wealth Management [Member] | Merchant services revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		0		0
Operating Segments [Member] | Wealth Management [Member] | Corporate card revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		179		177
Operating Segments [Member] | Wealth Management [Member] | Fiduciary and asset management revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		55,305		50,678
Operating Segments [Member] | Wealth Management [Member] | Personal trust revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		24,345		23,527
Operating Segments [Member] | Wealth Management [Member] | Corporate trust revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		9,260		7,660
Operating Segments [Member] | Wealth Management [Member] | Institutional trust & retirement plan services revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		16,148		13,253
Operating Segments [Member] | Wealth Management [Member] | Investment management services and other revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		5,552		6,238
Operating Segments [Member] | Wealth Management [Member] | Deposit service charges and fees [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		649		556
Operating Segments [Member] | Wealth Management [Member] | Commercial account service charge revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		546		477
Operating Segments [Member] | Wealth Management [Member] | Overdraft fee revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		30		20
Operating Segments [Member] | Wealth Management [Member] | Check card revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		0		0
Operating Segments [Member] | Wealth Management [Member] | Automated service charge and other deposit fee revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		73		59
Operating Segments [Member] | Wealth Management [Member] | Mortgage banking revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		0		0
Operating Segments [Member] | Wealth Management [Member] | Mortgage production revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		0		0
Operating Segments [Member] | Wealth Management [Member] | Mortgage servicing revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		0		0
Operating Segments [Member] | Wealth Management [Member] | Other revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		11,534		17,073
Funds Management and Other [Member] | Fees and commissions revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		(4,977)		(9,348)
Funds Management and Other [Member] | Brokerage and trading revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		562		1,767
Funds Management and Other [Member] | Trading revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		0		0
Funds Management and Other [Member] | Customer hedging revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		562		1,767
Funds Management and Other [Member] | Retail brokerage revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		0		0
Funds Management and Other [Member] | Insurance brokerage revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions				0
Funds Management and Other [Member] | Investment banking revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		0		0
Funds Management and Other [Member] | Transaction card revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		113		111
Funds Management and Other [Member] | TransFund EFT network revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		0		2
Funds Management and Other [Member] | Merchant services revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		0		0
Funds Management and Other [Member] | Corporate card revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		113		109
Funds Management and Other [Member] | Fiduciary and asset management revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		0		(21)
Funds Management and Other [Member] | Personal trust revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		0		0
Funds Management and Other [Member] | Corporate trust revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		0		0
Funds Management and Other [Member] | Institutional trust & retirement plan services revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		0		0
Funds Management and Other [Member] | Investment management services and other revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		0		(21)
Funds Management and Other [Member] | Deposit service charges and fees [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		0		1
Funds Management and Other [Member] | Commercial account service charge revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		0		0
Funds Management and Other [Member] | Overdraft fee revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		0		0
Funds Management and Other [Member] | Check card revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		0		1
Funds Management and Other [Member] | Automated service charge and other deposit fee revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		0		0
Funds Management and Other [Member] | Mortgage banking revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		(673)		(558)
Funds Management and Other [Member] | Mortgage production revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		0		0
Funds Management and Other [Member] | Mortgage servicing revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		(673)		(558)
Funds Management and Other [Member] | Other revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions		$ (4,979)		$ (10,648)
[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. Revenue from Contracts with Customers. 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	Mar. 31, 2024		Dec. 31, 2023		Mar. 31, 2023	Dec. 31, 2022
Assets: [Abstract]
Trading securities	$ 5,441,038		$ 5,193,505
Available for sale securities	12,653,088		12,286,681
Fair value option securities	19,805		20,671
Mortgage servicing rights	319,330		293,884		$ 299,803	$ 277,608
Derviative contracts, net of cash collateral, Assets, Fair value	263,493		410,304
Liabilities: [Abstract]
Derivative contracts, net of cash collateral, Liabilities, Fair Value	438,605		587,473
U.S. government securities [Member]
Assets: [Abstract]
Trading securities	426,825		10,959
Residential agency mortgage-backed securities [Member]
Assets: [Abstract]
Trading securities	4,898,485		5,105,137
Available for sale securities	7,816,688		6,834,720
Fair value option securities	19,805		20,671
Municipal securities [Member]
Assets: [Abstract]
Trading securities	67,120		37,413
Available for sale securities	304,826		502,833
U.S. Treasury [Member]
Assets: [Abstract]
Available for sale securities	920		925
Residential non-agency mortgage-backed securities [Member]
Assets: [Abstract]
Available for sale securities	846,805		799,877
Commercial agency mortgage-backed securities [Member]
Assets: [Abstract]
Available for sale securities	3,683,376		4,147,853
Other debt securities [Member]
Assets: [Abstract]
Trading securities	48,608		39,996
Available for sale securities	473		473
Fair Value, Recurring [Member]
Assets: [Abstract]
Trading securities	5,441,038		5,193,505
Available for sale securities	12,653,088		12,286,681
Residential mortgage loans held for sale	75,449	[1]	56,935	[2]
Mortgage servicing rights	319,330	[3]	293,884	[4]
Derviative contracts, net of cash collateral, Assets, Fair value	263,493	[5]	410,304	[6]
Liabilities: [Abstract]
Derivative contracts, net of cash collateral, Liabilities, Fair Value	438,605	[5]	587,473	[6]
Fair Value, Recurring [Member] | U.S. government securities [Member]
Assets: [Abstract]
Trading securities	426,825		10,959
Fair Value, Recurring [Member] | Residential agency mortgage-backed securities [Member]
Assets: [Abstract]
Trading securities	4,898,485		5,105,137
Available for sale securities	7,816,688		6,834,720
Fair value option securities	19,805		20,671
Fair Value, Recurring [Member] | Municipal securities [Member]
Assets: [Abstract]
Trading securities	67,120		37,413
Available for sale securities	304,826		502,833
Fair Value, Recurring [Member] | Other trading securities
Assets: [Abstract]
Trading securities	48,608		39,996
Fair Value, Recurring [Member] | U.S. Treasury [Member]
Assets: [Abstract]
Available for sale securities	920		925
Fair Value, Recurring [Member] | Residential non-agency mortgage-backed securities [Member]
Assets: [Abstract]
Available for sale securities	846,805		799,877
Fair Value, Recurring [Member] | Commercial agency mortgage-backed securities [Member]
Assets: [Abstract]
Available for sale securities	3,683,376		4,147,853
Fair Value, Recurring [Member] | Other debt securities [Member]
Assets: [Abstract]
Available for sale securities	473		473
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Assets: [Abstract]
Trading securities	370,062		9,017
Available for sale securities	920		925
Residential mortgage loans held for sale	0	[1]	0	[2]
Mortgage servicing rights	0	[3]	0	[4]
Derviative contracts, net of cash collateral, Assets, Fair value	10	[5]	0	[6]
Liabilities: [Abstract]
Derivative contracts, net of cash collateral, Liabilities, Fair Value	649	[5]	2,607	[6]
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. government securities [Member]
Assets: [Abstract]
Trading securities	370,062		9,017
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] | Other trading securities
Assets: [Abstract]
Trading securities	0		0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. Treasury [Member]
Assets: [Abstract]
Available for sale securities	920		925
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 2 [Member]
Assets: [Abstract]
Trading securities	5,070,976		5,184,488
Available for sale securities	12,651,695		12,285,283
Residential mortgage loans held for sale	68,285	[1]	49,749	[2]
Mortgage servicing rights	0	[3]	0	[4]
Derviative contracts, net of cash collateral, Assets, Fair value	263,483	[5]	410,304	[6]
Liabilities: [Abstract]
Derivative contracts, net of cash collateral, Liabilities, Fair Value	437,956	[5]	584,866	[6]
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. government securities [Member]
Assets: [Abstract]
Trading securities	56,763		1,942
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Residential agency mortgage-backed securities [Member]
Assets: [Abstract]
Trading securities	4,898,485		5,105,137
Available for sale securities	7,816,688		6,834,720
Fair value option securities	19,805		20,671
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Municipal securities [Member]
Assets: [Abstract]
Trading securities	67,120		37,413
Available for sale securities	304,826		502,833
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other trading securities
Assets: [Abstract]
Trading securities	48,608		39,996
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	846,805		799,877
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Commercial agency mortgage-backed securities [Member]
Assets: [Abstract]
Available for sale securities	3,683,376		4,147,853
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 3 [Member]
Assets: [Abstract]
Trading securities	0		0
Available for sale securities	473		473
Residential mortgage loans held for sale	7,164	[1]	7,186	[2]
Mortgage servicing rights	319,330	[3]	293,884	[4]
Derviative contracts, net of cash collateral, Assets, Fair value	$ 0	[5]	$ 0	[6]
Liquidity Discount on Mortgage Loans Qualifying for Sale to US Govt Agencies	77.97%		77.74%
Liabilities: [Abstract]
Derivative contracts, net of cash collateral, 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
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other trading securities
Assets: [Abstract]
Trading 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	$ 473		$ 473
[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 77.97% of the unpaid principal balance. 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 77.74% of the unpaid principal balance. 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 5, Mortgage Banking Activities. 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 5, Mortgage Banking Activities. See Note 3 for detail of fair value of derivative contracts by contract type. Derivative contracts in asset and liability positions that were valued based on quoted prices in active markets for identical instruments (Level 1) are primarily exchange-traded interest rate derivative contracts held for trading purposes See Note 3 for detail of fair value of derivative contracts by contract type. Derivative contracts in asset and liability positions that were valued based on quoted prices in active markets for identical instruments (Level 1) are primarily exchange-traded interest rate derivative contracts held for trading purposes.

Fair Value Measurements, Fair_2

Fair Value Measurements, Fair Value Measured On a Nonrecurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other gains (losses), net	$ 4,269	$ 2,251
Fair Value, Nonrecurring [Member] | Nonaccruing Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross charge-offs against allowance for loan losses	4,935	1,991
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
Other gains (losses), net		(101)
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] | Nonaccruing Loans [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 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
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Nonaccruing Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	67	0
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		547
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Nonaccruing Loans [Member] | Management knowledge of industry and non-real estate collateral | Discounted Cash Flow [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	$ 23,741
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Real estate and other repossessed assets [Member] | Management knowledge of industry and non-real estate collateral | Discounted Cash Flow [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		$ 0

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] - Nonaccruing Loans [Member] - Fair Value, Inputs, Level 3 [Member] - USD ($) $ in Thousands	Mar. 31, 2024		Mar. 31, 2023
Discounted Cash Flow [Member] | Management knowledge of Industry and non-real estate collateral including but not limited to recoverable oil and gas reserves, forward-looking commodity prices, estimated operating costs [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure			$ 14,040
Discounted Cash Flow [Member] | Management knowledge of industry and non-real estate collateral
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure	$ 23,741
Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value of Impaired Loans as Percentage of Unpaid Principal Balance	17%	[1]	88%	[2]
Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value of Impaired Loans as Percentage of Unpaid Principal Balance	96%	[1]	88%	[2]
Weighted Average [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value of Impaired Loans as Percentage of Unpaid Principal Balance	83%	[1]	88%	[2]
[1] Represents fair value as a percentage of the unpaid principal balance. Represents fair value as a percentage of the unpaid principal balance.

Fair Value Measurements, Financ

Fair Value Measurements, Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2024		Dec. 31, 2023		Mar. 31, 2023	Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	$ 5,441,038		$ 5,193,505
Debt Securities, Held-to-maturity, gross	2,338,460		2,409,090
Investment securities, Allowance for Credit Loss	(299)	[1]	(336)	[2]
Investment Securities, Amortized Cost, After Allowance for Credit Loss	2,338,161		2,408,754
Available for sale securities	12,653,088		12,286,681
Fair value option securities	19,805		20,671
Residential mortgage loans held for sale	75,449		56,935
Loans	24,172,560		23,904,968
Allowance for loan losses	(281,623)		(277,123)
Loans, net of allowance	23,890,937		23,627,845
Mortgage servicing rights	319,330		293,884		$ 299,803	$ 277,608
Derviative contracts, net of cash collateral, Assets, Fair value	263,493		410,304
Time deposits	3,366,909		3,012,022
Subordinated debentures	131,154		131,150
Derivative contracts, net of cash collateral, Liabilities, Fair Value	438,605		587,473
Commercial [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	15,132,867		14,803,769
Allowance for loan losses	(146,267)		(141,232)
Commercial real estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	5,236,677		5,337,647
Allowance for loan losses	(97,479)		(94,718)
Loans to individuals [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	3,803,016		3,763,552
Allowance for loan losses	(37,877)		(41,173)
U.S. government securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	426,825		10,959
Residential agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	4,898,485		5,105,137
Debt Securities, Held-to-maturity, gross	2,196,121		2,255,340
Available for sale securities	7,816,688		6,834,720
Fair value option securities	19,805		20,671
Municipal securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	67,120		37,413
Debt Securities, Held-to-maturity, gross	108,793		120,705
Available for sale securities	304,826		502,833
U.S. Treasury [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	920		925
Residential non-agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	846,805		799,877
Commercial agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Held-to-maturity, gross	17,258		17,258
Available for sale securities	3,683,376		4,147,853
Other debt securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	48,608		39,996
Debt Securities, Held-to-maturity, gross	16,288		15,787
Available for sale securities	473		473
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	801,677		947,613
Interest-bearing cash and cash equivalents	354,070		400,652
Trading securities	5,441,038		5,193,505
Debt Securities, Held-to-maturity, gross	2,186,043		2,244,489
Investment securities, Allowance for Credit Loss	(299)		(336)
Investment Securities, Amortized Cost, After Allowance for Credit Loss	2,185,744		2,244,153
Available for sale securities	12,653,088		12,286,681
Residential mortgage loans held for sale	75,449		56,935
Loans	24,172,560		23,904,968
Allowance for loan losses	(281,623)		(277,123)
Loans, net of allowance	23,890,937		23,627,845
Mortgage servicing rights	319,330		293,884
Derviative contracts, net of cash collateral, Assets, Fair value	263,493		410,304
Deposits with no stated maturity	32,016,638		31,007,679
Time deposits	3,366,909		3,012,022
Other borrowed funds	7,986,169		8,824,300
Subordinated debentures	131,154		131,150
Derivative contracts, net of cash collateral, Liabilities, Fair Value	438,605		587,473
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Commercial [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	15,132,867		14,803,769
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Commercial real estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	5,236,677		5,337,647
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Loans to individuals [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	3,803,016		3,763,552
Carrying (Reported) Amount, Fair Value Disclosure [Member] | U.S. government securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	426,825		10,959
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	4,898,485		5,105,137
Debt Securities, Held-to-maturity, gross	2,044,972		2,092,083
Available for sale securities	7,816,688		6,834,720
Fair value option securities	19,805		20,671
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Municipal securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	67,120		37,413
Debt Securities, Held-to-maturity, gross	108,793		120,705
Available for sale securities	304,826		502,833
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Other trading securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	48,608		39,996
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	920		925
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	846,805		799,877
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Commercial agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Held-to-maturity, gross	15,990		15,914
Available for sale securities	3,683,376		4,147,853
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	16,288		15,787
Available for sale securities	473		473
Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	801,677		947,613
Interest-bearing cash and cash equivalents	354,070		400,652
Trading securities	5,441,038		5,193,505
Debt Securities, Held-to-maturity, gross	2,000,065		2,072,586
Investment securities, Allowance for Credit Loss	0		0
Investment Securities, Amortized Cost, After Allowance for Credit Loss	2,000,065		2,072,586
Available for sale securities	12,653,088		12,286,681
Residential mortgage loans held for sale	75,449		56,935
Loans	23,874,820		23,768,385
Allowance for loan losses	0		0
Loans, net of allowance	23,874,820		23,768,385
Mortgage servicing rights	319,330		293,884
Derviative contracts, net of cash collateral, Assets, Fair value	263,493		410,304
Deposits with no stated maturity	32,016,638		31,007,679
Time deposits	3,346,163		2,993,685
Other borrowed funds	7,986,169		8,824,299
Subordinated debentures	118,875		115,798
Derivative contracts, net of cash collateral, Liabilities, Fair Value	438,605		587,473
Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	15,055,904		14,862,873
Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial real estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	5,143,304		5,270,657
Estimate of Fair Value, Fair Value Disclosure [Member] | Loans to individuals [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	3,675,612		3,634,855
Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. government securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	426,825		10,959
Estimate of Fair Value, Fair Value Disclosure [Member] | Residential agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	4,898,485		5,105,137
Debt Securities, Held-to-maturity, gross	1,858,027		1,917,810
Available for sale securities	7,816,688		6,834,720
Fair value option securities	19,805		20,671
Estimate of Fair Value, Fair Value Disclosure [Member] | Municipal securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	67,120		37,413
Debt Securities, Held-to-maturity, gross	112,338		125,525
Available for sale securities	304,826		502,833
Estimate of Fair Value, Fair Value Disclosure [Member] | Other trading securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	48,608		39,996
Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. Treasury [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	920		925
Estimate of Fair Value, 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	846,805		799,877
Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Held-to-maturity, gross	14,987		15,067
Available for sale securities	3,683,376		4,147,853
Estimate of Fair Value, Fair Value Disclosure [Member] | Other debt securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Held-to-maturity, gross	14,713		14,184
Available for sale securities	473		473
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	801,677		947,613
Interest-bearing cash and cash equivalents	354,070		400,652
Trading securities	370,062		9,017
Debt Securities, Held-to-maturity, gross	0		0
Investment securities, Allowance for Credit Loss	0		0
Investment Securities, Amortized Cost, After Allowance for Credit Loss	0		0
Available for sale securities	920		925
Residential mortgage loans held for sale	0		0
Loans	0		0
Allowance for loan losses	0		0
Loans, net of allowance	0		0
Mortgage servicing rights	0		0
Derviative contracts, net of cash collateral, Assets, Fair value	10		0
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 collateral, Liabilities, Fair Value	649		2,607
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0		0
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial real estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0		0
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Loans to individuals [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0		0
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. government securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	370,062		9,017
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [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 option securities	0		0
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [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, Fair Value Disclosure [Member] | Other trading securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	0		0
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. Treasury [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	920		925
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, 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	0		0
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial agency mortgage-backed 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 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [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, Fair Value Disclosure [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	5,070,976		5,184,488
Debt Securities, Held-to-maturity, gross	1,899,830		1,959,366
Investment securities, Allowance for Credit Loss	0		0
Investment Securities, Amortized Cost, After Allowance for Credit Loss	1,899,830		1,959,366
Available for sale securities	12,651,695		12,285,283
Residential mortgage loans held for sale	68,285		49,749
Loans	0		0
Allowance for loan losses	0		0
Loans, net of allowance	0		0
Mortgage servicing rights	0		0
Derviative contracts, net of cash collateral, Assets, Fair value	263,483		410,304
Deposits with no stated maturity	0		0
Time deposits	0		0
Other borrowed funds	0		0
Subordinated debentures	118,875		115,798
Derivative contracts, net of cash collateral, Liabilities, Fair Value	437,956		584,866
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0		0
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial real estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0		0
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Loans to individuals [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0		0
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. government securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	56,763		1,942
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Residential agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	4,898,485		5,105,137
Debt Securities, Held-to-maturity, gross	1,858,027		1,917,810
Available for sale securities	7,816,688		6,834,720
Fair value option securities	19,805		20,671
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Municipal securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	67,120		37,413
Debt Securities, Held-to-maturity, gross	12,103		12,305
Available for sale securities	304,826		502,833
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Other trading securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	48,608		39,996
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [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, 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	846,805		799,877
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Held-to-maturity, gross	14,987		15,067
Available for sale securities	3,683,376		4,147,853
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Other debt securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Held-to-maturity, gross	14,713		14,184
Available for sale securities	0		0
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [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	100,235		113,220
Investment securities, Allowance for Credit Loss	0		0
Investment Securities, Amortized Cost, After Allowance for Credit Loss	100,235		113,220
Available for sale securities	473		473
Residential mortgage loans held for sale	7,164		7,186
Loans	23,874,820		23,768,385
Allowance for loan losses	0		0
Loans, net of allowance	23,874,820		23,768,385
Mortgage servicing rights	319,330		293,884
Derviative contracts, net of cash collateral, Assets, Fair value	0		0
Deposits with no stated maturity	32,016,638		31,007,679
Time deposits	3,346,163		2,993,685
Other borrowed funds	7,986,169		8,824,299
Subordinated debentures	0		0
Derivative contracts, net of cash collateral, Liabilities, Fair Value	0		0
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	15,055,904		14,862,873
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial real estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	5,143,304		5,270,657
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Loans to individuals [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	3,675,612		3,634,855
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [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, Fair Value Disclosure [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 option securities	0		0
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Municipal securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	0		0
Debt Securities, Held-to-maturity, gross	100,235		113,220
Available for sale securities	0		0
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Other trading securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	0		0
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [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, 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	0		0
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial agency mortgage-backed 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 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [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	$ 473		$ 473
[1] Carrying value includes $152 million of net unrealized loss which remains in AOCI in the Consolidated Balance Sheets related to certain securities transferred during the second quarter of 2022 from the Available for Sale securities portfolio to the Investment securities portfolio. Carrying value includes $165 million of net unrealized loss which remains in AOCI in the Consolidated Balance Sheets related to certain securities transferred during the second quarter of 2022 from the Available for Sale securities portfolio to the Investment securities portfolio.