10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One) 

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended March 31, 2023

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from _____________ to ______________                 

Commission File No. 001-37811

BOK FINANCIAL CORP

(Exact name of registrant as specified in its charter) 

Oklahoma		73-1373454
(State or other jurisdiction of Incorporation or Organization)		(IRS Employer Identification No.)
Bank of Oklahoma Tower
Boston Avenue at Second Street
Tulsa,	Oklahoma	74192
(Address of Principal Executive Offices)		(Zip Code)

(918) 588-6000

(Registrant’s telephone number, including area code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.       Yes  ý  No  ¨

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes  ý  No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, or a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer," "smaller reporting company," and "emerging growth company" in Rule 12b-2 of the Exchange Act.

Large accelerated filer  ý       Accelerated filer       ¨            

Non-accelerated filer   ¨    Smaller reporting company ☐

    Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).   Yes  ☐  No  ý

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date: 66,600,833 shares of common stock ($.00006 par value) as of March 31, 2023.

BOK Financial Corporation

Form 10-Q

Quarter Ended March 31, 2023

Index

Part I.  Financial Information
Management's Discussion and Analysis (Item 2)	1
Market Risk (Item 3)	34
Controls and Procedures (Item 4)	39
Consolidated Financial Statements – Unaudited (Item 1)	40
Quarterly Financial Summary – Unaudited (Item 2)	84
Quarterly Earnings Trend – Unaudited	87
Part II.  Other Information
Item 1.  Legal Proceedings	88
Item 1A. Risk Factors	88
Item 2.  Unregistered Sales of Equity Securities and Use of Proceeds	88
Item 6.  Exhibits	89
Signatures	90

Management's Discussion and Analysis of Financial Condition and Results of Operations

Performance Summary

BOK Financial Corporation ("the Company") reported net income of $162.4 million or $2.43 per diluted share for the first quarter of 2023 compared to $168.4 million or $2.51 per diluted share for the fourth quarter of 2022. Pre-provision net revenue ("PPNR"), a non-GAAP measure, decreased $7.0 million to $224.3 million compared to the fourth quarter of 2022.

Highlights of the first quarter of 2023 compared to the fourth quarter of 2022 included:

•Net interest revenue totaled $352.3 million, consistent with the prior quarter, despite two fewer days in the first quarter. Net interest margin was 3.45 percent for the first quarter of 2023 compared to 3.54 percent for the prior quarter, driven by higher funding costs.

•Fees and commissions revenue totaled $186.0 million, a decrease of $7.6 million. Brokerage and trading revenue decreased $10.6 million related to lower trading volumes due to escalated market volatility. This was partially offset by a $4.3 million increase in mortgage banking revenue due to higher production volume and expanded mortgage servicing.

•The net cost of the changes in fair value of mortgage servicing rights and related economic hedges was $10.5 million for the first quarter of 2023 compared to $1.2 million for the fourth quarter of 2022 due to interest rate volatility in the first quarter.

•Other operating expense totaled $305.8 million, a decrease of $12.6 million. Personnel expense decreased $4.3 million, largely driven by a one-time incentive given to employees in the fourth quarter of 2022, partially offset by increased employee benefits costs related to seasonal payroll taxes. Non-personnel expense decreased $8.4 million, led by a reduction in professional fees and services and mortgage banking costs.

•Period-end outstanding loan balances totaled $22.8 billion at March 31, 2023, growing $193 million compared to December 31, 2022, largely due to growth in commercial real estate loans driven primarily by loans secured by multifamily residential properties and industrial facilities. Average loan balances increased $500 million to $22.5 billion, primarily due to higher commercial and commercial real estate balances.

•We recorded a $16.0 million provision for expected credit losses in the first quarter of 2023, as key economic factors in the base case, including projected West Texas Intermediate ("WTI") oil prices and commercial real estate vacancy rates, were less favorable to economic growth. We recorded a $15.0 million provision for expected credit losses in the fourth quarter of 2022, primarily as a result of growth in loans and loan commitments during the quarter. The combined allowance for credit losses totaled $312 million or 1.37 percent of outstanding loans at March 31, 2023. The combined allowance for credit losses was $297 million or 1.31 percent of outstanding loans at December 31, 2022.

•Nonperforming assets not guaranteed by U.S. government agencies decreased $2.5 million compared to December 31, 2022. Potential problem loans grew $44 million while other loans especially mentioned increased $65 million. Net charge-offs were $769 thousand or 0.01 percent of average loans on an annualized basis for the first quarter of 2023. Net charge-offs were 0.07 percent of average loans over the last four quarters. Net charge-offs were $15.5 million or 0.28 percent of average loans on an annualized basis for the fourth quarter of 2022.

•Period-end deposits were $32.6 billion at March 31, 2023, a $1.9 billion decrease compared to December 31, 2022, as customers redeployed resources and pursued investment alternatives following the savings trend during the height of the pandemic. Average deposits decreased $2.0 billion, including a $1.8 billion reduction in demand deposits.

•Assets under management or administration totaled $102.3 billion at March 31, 2023 compared to $99.7 billion at December 31, 2022, with growth across all categories.

•The company's tangible common equity ratio, a non-GAAP measure, was 8.46 percent at March 31, 2023 and 7.63 percent at December 31, 2022. The tangible common equity ratio is primarily based on total shareholders' equity, which includes unrealized gains and losses on available for sale securities. Adjusted for all securities portfolio losses, including the tax adjusted losses in the investment portfolio, the tangible common equity ratio would be 8.22 percent at March 31, 2023 and 7.36 percent at December 31, 2022.

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•The common equity Tier 1 capital ratio at March 31, 2023 was 12.19 percent. Other regulatory capital ratios included the Tier 1 capital ratio at 12.20 percent, total capital ratio at 13.21 percent, and leverage ratio at 9.94 percent. At December 31, 2022, the common equity Tier 1 capital ratio was 11.69 percent, the Tier 1 capital ratio was 11.71 percent, total capital ratio was 12.67 percent, and leverage ratio was 9.91 percent.

•The Company repurchased 447,071 shares of common stock at an average price of $98.64 per share in the first quarter of 2023 and 314,406 shares at an average price of $103.14 in the fourth quarter of 2022. We view share buybacks opportunistically, but within the context of maintaining our strong capital position.

•The Company paid a regular cash dividend of $36.0 million or $0.54 per common share during the first quarter of 2023. On May 2, 2023, the board of directors approved a quarterly cash dividend of $0.54 per common share payable on or about May 30, 2023 to shareholders of record as of May 15, 2023.

Highlights of the three months ended March 31, 2023 compared to the three months ended March 31, 2022 included:

•Tax-equivalent net interest revenue totaled $354.6 million for the three months ended March 31, 2023 and $270.4 million for the three months ended March 31, 2022. Net interest revenue decreased $19.0 million from changes in earning assets and increased $103.3 million from changes in interest rates. Net interest margin was 3.45 percent compared to 2.44 percent. In response to rising inflation, the Federal Reserve increased the federal funds rate 475 basis points since the beginning of 2022. The resulting impact on market interest rates increased net interest margin as our earning assets, led by our significant percentage of variable-rate commercial loans, repriced at a higher rate and faster pace than our interest-bearing liabilities. Average earning assets decreased $2.7 billion to $40.8 billion, primarily due to a reduction in trading securities, partially offset by an increase in loan balances. Total interest-bearing deposits decreased $4.2 billion while total other borrowed funds increased $3.1 billion. Loan yields increased 310 basis points while funding costs increased 222 basis points.

•Fees and commissions revenue totaled $186.0 million for the three months ended March 31, 2023, an $88.3 million increase compared to the three months ended March 31, 2022. Brokerage and trading revenue increased $79.5 million, primarily due to disruption in the fixed income markets related to economic uncertainty in the first quarter of 2022. Fiduciary and asset management revenue increased $4.3 million, led by growth in mutual fund fees and Cavanal Hill fund fees. Mortgage banking revenue decreased $2.3 million as rapidly rising mortgage interest rates and continued inventory shortages have adversely affected both loan production volume and margins. Other revenue increased $6.5 million, primarily related to higher margin interest fees.

•Total operating expense was $305.8 million for the three months ended March 31, 2023, an increase of $28.2 million compared to the three months ended March 31, 2022. Personnel expense increased $22.9 million. Regular compensation increased $8.6 million, largely related to annual merit increases and salary adjustments while cash-based incentive compensation grew $7.3 million due to higher sales activity. Non-personnel expense increased $5.3 million to $123.7 million, largely related to higher FDIC insurance costs following increased assessment rates in 2023 and data processing costs related to ongoing technology projects.

•We recorded a $16.0 million provision for expected credit losses in the first quarter of 2023, as key economic factors in the base case, including projected West Texas Intermediate ("WTI") oil prices and projected commercial real estate vacancy rates, were less favorable to economic growth. No provision for expected credit losses was recorded in the first quarter of 2022.

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Results of Operations

Net Interest Revenue and Net Interest Margin

Net interest revenue is the interest earned on debt securities, loans and other interest-earning assets less interest paid for interest-bearing deposits and other borrowings. The net interest margin is calculated by dividing tax-equivalent net interest revenue by average interest-earning assets. Net interest spread is the difference between the average rate earned on interest-earning assets and the average rate paid on interest-bearing liabilities. Net interest margin is typically greater than net interest spread due to interest income earned on assets funded by non-interest bearing liabilities such as demand deposits and equity.

Tax-equivalent net interest revenue totaled $354.6 million for the first quarter of 2023, consistent with the prior quarter despite two less days in the first quarter. Compared to the fourth quarter of 2022, net interest revenue increased $10.6 million from changes in interest rates and decreased $10.9 million from changes in earning assets. Table 1 shows the effect on net interest revenue from changes in average balances and interest rates for various types of earning assets and interest-bearing liabilities.

Average earning assets increased $1.5 billion compared to the fourth quarter of 2022. The average balance of available for sale securities, which consists largely of residential and commercial mortgage-backed securities guaranteed by U.S. government agencies, increased $785 million as we reposition our balance sheet for the current rate environment. Average loan balances increased $500 million, largely due to growth in commercial and commercial real estate loans. Average fair value option securities, held as an economic hedge of the changes in fair value of our mortgage servicing rights, increased $208 million while average restricted equity securities grew $100 million.

Total average deposits were reduced by $2.0 billion compared to the fourth quarter of 2022 as customers redeployed cash resources and seek higher yielding alternatives following the savings trend during the height of the pandemic. Other borrowings increased $2.0 billion while funds purchased and repurchase agreements grew $713 million.

Net interest margin was 3.45 percent compared to 3.54 percent in the fourth quarter of 2022. In recent prior quarters, the rapid pace of market interest rate increases grew net interest margin as our earning assets, led by our significant percentage of variable-rate loans, repriced at a higher rate and faster pace than our interest-bearing liabilities. In the current quarter, we saw margin compression as our interest-bearing liabilities began to catch up and reprice more quickly. The tax-equivalent yield on earning assets was 5.06 percent, an increase of 53 basis points. Loan yields increased 68 basis points to 6.67 percent. The yield on trading securities was up 82 basis points to 4.52 percent. The available for sale securities portfolio yield increased 33 basis points to 2.87 percent while the yield on the fair value option securities portfolio grew 77 basis points to 5.17 percent. The yield on interest-bearing cash and cash equivalents increased 22 basis points to 4.28 percent.

Funding costs were 2.43 percent, a 86 basis point increase. The cost of interest-bearing deposits increased 61 basis points to 1.83 percent. The cost of funds purchased and repurchase agreements increased 128 basis points to 3.33 percent while the cost of other borrowings increased 65 basis points to 4.73 percent. The benefit to net interest margin from assets funded by non-interest liabilities was 82 basis points, an increase of 24 basis points.

Our overall objective is to manage the Company's balance sheet for changes in interest rates as is further described in the Market Risk section of this report. Approximately 79 percent of our commercial and commercial real estate loan portfolios are either variable rate or fixed rate that will reprice within one year. These loans are funded primarily by deposit accounts that are either non-interest bearing, or that reprice more slowly than the loans. The result is a balance sheet that would be asset sensitive, which means that assets generally reprice more quickly than liabilities. One of the strategies that we use to manage toward a relative rate-neutral position is to purchase fixed rate residential mortgage-backed securities issued primarily by U.S. government agencies and fund them with market-rate-sensitive liabilities. The liability-sensitive nature of this strategy provides an offset to the asset-sensitive characteristics of our loan portfolio. We also may use derivative instruments to manage our interest rate risk. 

The effectiveness of these strategies is reflected in the overall change in net interest revenue due to changes in interest rates as shown in Table 1 and in the interest rate sensitivity projections as shown in the Market Risk section of this report.

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Table 1 – Volume/Rate Analysis

(In thousands)

	Three Months Ended Mar. 31, 2023 / Dec. 31, 2022						Three Months Ended Mar. 31, 2023 / 2022
			Change Due To1						Change Due To1
	Change		Volume		Yield/Rate		Change		Volume		Yield/Rate
Tax-equivalent interest revenue:
Interest-bearing cash and cash equivalents	$	684	$	430	$	254	$	6,033	$	(2,389)	$	8,422
Trading securities	5,600		(614)		6,214		(6,968)		(50,714)		43,746
Investment securities	(206)		(245)		39		6,542		19,095		(12,553)
Available for sale securities	15,795		5,818		9,977		31,094		(3,836)		34,930
Fair value option securities	2,962		2,575		387		3,402		2,299		1,103
Restricted equity securities	2,720		1,861		859		4,701		1,829		2,872
Residential mortgage loans held for sale	(411)		(456)		45		(415)		(1,227)		812
Loans	37,977		4,259		33,718		189,553		25,424		164,129
Total tax-equivalent interest revenue	65,121		13,628		51,493		233,942		(9,519)		243,461
Interest expense:
Transaction deposits	27,043		(1,565)		28,608		82,593		(10,009)		92,602
Savings deposits	43		(3)		46		175		6		169
Time deposits	2,614		176		2,438		4,908		(346)		5,254
Funds purchased and repurchase agreements	9,043		4,672		4,371		9,752		(1,293)		11,045
Other borrowings	26,627		21,297		5,330		51,498		21,166		30,332
Subordinated debentures	31		(23)		54		767		(2)		769
Total interest expense	65,401		24,554		40,847		149,693		9,522		140,171
Tax-equivalent net interest revenue	(280)		(10,926)		10,646		84,249		(19,041)		103,290
Change in tax-equivalent adjustment	(2)						312
Net interest revenue	$	(278)					$	83,937

1 Changes attributable to both volume and yield/rate are allocated to both volume and yield/rate on an equal basis.

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Other Operating Revenue

Other operating revenue was $177.9 million for the first quarter of 2023, a decrease of $19.2 million compared to the fourth quarter of 2022.

Table 2 – Other Operating Revenue 

(Dollars in thousands)

	Three Months Ended				Increase (Decrease)		% Increase (Decrease)		Three Months Ended Mar. 31, 2022		Increase (Decrease)		% Increase (Decrease)
	Mar. 31, 2023		Dec. 31, 2022
Brokerage and trading revenue	$	52,396	$	63,008	$	(10,612)	(17)	%	$	(27,079)	$	79,475	(293)	%
Transaction card revenue	25,621		27,136		(1,515)		(6)	%	24,216		1,405		6	%
Fiduciary and asset management revenue	50,657		49,899		758		2	%	46,399		4,258		9	%
Deposit service charges and fees	25,968		26,429		(461)		(2)	%	27,004		(1,036)		(4)	%
Mortgage banking revenue	14,367		10,065		4,302		43	%	16,650		(2,283)		(14)	%
Other revenue	16,970		17,034		(64)		—	%	10,445		6,525		62	%
Total fees and commissions revenue	185,979		193,571		(7,592)		(4)	%	97,635		88,344		90	%
Other gains (losses), net	2,251		8,427		(6,176)		N/A		(1,644)		3,895		N/A
Gain (loss) on derivatives, net	(1,344)		4,548		(5,892)		N/A		(46,981)		45,637		N/A
Loss on fair value option securities, net	(2,962)		(2,568)		(394)		N/A		(11,201)		8,239		N/A
Change in fair value of mortgage servicing rights	(6,059)		(2,904)		(3,155)		N/A		49,110		(55,169)		N/A
Gain (loss) on available for sale securities, net	—		(3,988)		3,988		N/A		937		(937)		N/A
Total other operating revenue	$	177,865	$	197,086	$	(19,221)	(10)	%	$	87,856	$	90,009	102	%

Certain percentage increases (decreases) in non-fees and commissions revenue are not meaningful for comparison purposes based on the nature of the item.

Fees and commissions revenue

Diversified sources of fees and commissions revenue are a significant part of our business strategy and represented 35 percent of total revenue for the first quarter of 2023, excluding provision for credit losses and gains and losses on other assets, securities and derivatives and the change in the fair value of mortgage servicing rights. We believe that a variety of fee revenue sources provides diversification to changes resulting from market or economic conditions such as interest rates, values in the equity markets, commodity prices and consumer spending, all of which can be volatile. Many of the economic factors such as rising interest rates that we expect will result in growth in net interest revenue or fiduciary and asset management revenue may also affect mortgage banking production volumes and related trading. The velocity of changes in market conditions and interest rates may result in timing differences between when offsetting impacts and benefits are realized. Generally, for operating revenues not as directly related to movement in interest rates, we expect growth to come through offering new products and services and by further development of our presence in other markets. However, current and future economic conditions, regulatory constraints, increased competition and saturation in our existing markets could affect the rate of future increases.

Brokerage and Trading Revenue

Brokerage and trading revenue, which includes revenues from trading, customer hedging, retail brokerage and investment banking, decreased $10.6 million or 17 percent compared to the fourth quarter of 2022.

Trading revenue includes net realized and unrealized gains and losses primarily related to residential mortgage-backed securities guaranteed by U.S. government agencies and related derivative instruments that enable our mortgage banking customers to manage their production risk. Trading revenue also includes net realized and unrealized gains and losses on municipal securities and other financial instruments that we sell to institutional customers, along with changes in the fair value of financial instruments we hold as economic hedges against market risk of our trading securities. Trading revenue was $27.6 million, an $8.3 million decrease compared to the prior quarter, largely due to a lower volume of U.S. agency residential mortgage-backed securities trading activity caused by high market volatility.

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Investment banking, which includes fees earned upon completion of underwriting, financial advisory services and loan syndication fees, totaled $9.3 million for the first quarter of 2023, a decrease of $2.6 million compared to the fourth quarter of 2022, primarily related to timing and volume of transactions. A reduction in syndication activity was partially offset by higher underwriting fees.

Customer hedging revenue is based primarily on realized and unrealized changes in the fair value of derivative contracts held for customer risk management programs. As more fully discussed under Customer Derivative Programs in Note 3 of the Consolidated Financial Statements, we offer commodity, interest rate, foreign exchange and equity derivatives to our customers. Customer hedging revenue totaled $8.4 million for the first quarter of 2023, consistent with the prior quarter. Customer hedging revenue includes credit valuation adjustments of the fair value of derivatives to reflect the risk of counterparty default.

Transaction Card Revenue

Transaction card revenue totaled $25.6 million for the first quarter of 2023, a $1.5 million decrease compared to the prior quarter led by lower transaction volumes following seasonal highs in the fourth quarter. , largely due to stimulus measures and

Fiduciary and Asset Management Revenue

Fiduciary and asset management revenue is earned through managing or holding of assets for customers and executing transactions or providing related services. Fiduciary and asset management revenue is largely based on the fair value of assets. Rates applied to asset values vary based on the nature of the relationship. Fiduciary relationships and managed asset relationships generally have higher fee rates than non-fiduciary and/or managed relationships. Fiduciary and asset management revenue was relatively unchanged compared to the fourth quarter of 2022. Increased trust business line fees were offset by lower Cavanal Hill money market fund fees and mutual fund fees.

A distribution of assets under management or administration and related fiduciary and asset management revenue follows:

Table 3 – Assets Under Management or Administration

(Dollars in thousands)

	Three Months Ended
	March 31, 2023						December 31, 2022						March 31, 2022
	Balance1		Revenue2		Margin3		Balance1		Revenue2		Margin3		Balance1		Revenue2		Margin3
Managed fiduciary assets:
Personal	$	10,609,920	$	24,839	0.94	%	$	10,317,729	$	25,565	0.99	%	$	11,292,472	$	28,331	1.00	%
Institutional	18,683,598		9,223		0.20	%	17,229,041		7,884		0.18	%	18,592,153		9,995		0.22	%
Total managed fiduciary assets	29,293,518		34,062		0.47	%	27,546,770		33,449		0.49	%	29,884,625		38,326		0.51	%
Non-managed assets:
Fiduciary	28,164,407		13,785		0.20	%	28,513,725		13,086		0.18	%	31,210,695		5,107		0.07	%
Non-fiduciary	19,830,593		2,810		0.06	%	19,467,202		3,364		0.07	%	19,361,212		2,966		0.06	%
Safekeeping and brokerage assets under administration	25,021,601		—		—	%	24,207,343		—		—	%	20,624,823		—		—	%
Total non-managed assets	73,016,601		16,595		0.09	%	72,188,270		16,450		0.09	%	71,196,730		8,073		0.05	%
Total assets under management or administration	$	102,310,119	$	50,657	0.20	%	$	99,735,040	$	49,899	0.20	%	$	101,081,355	$	46,399	0.18	%

1 Assets under management or administration balance excludes certain assets under custody held by a sub-custodian where minimal revenue is recognized. $18 billion, $17 billion, and $22 billion of such assets are excluded from assets under management or administration for the three months ended March 31, 2023, December 31, 2022, and March 31, 2022, respectively.

2    Fiduciary and asset management revenue includes asset-based and other fees associated with the assets.

3    Annualized revenue divided by period-end balance.

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A summary of changes in assets under management or administration for the three months ended March 31, 2023 and 2022 follows:

Table 4 – Changes in Assets Under Management or Administration

(In thousands)

	Three Months Ended March 31,
	2023		2022
Beginning balance	$	99,735,040	$	104,917,721
Net inflows (outflows)	(516,918)		(1,774,056)
Net change in fair value	3,091,997		(2,062,310)
Ending balance	$	102,310,119	$	101,081,355

Assets under management as of March 31, 2023 consist of 45 percent fixed income, 32 percent equities, 14 percent cash, and 9 percent alternative investments.

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Mortgage Banking Revenue

Mortgage banking revenue increased $4.3 million over the fourth quarter of 2022. Mortgage production revenue increased $3.4 million along with higher mortgage originations following seasonal declines in the fourth quarter. Mortgage production volume increased $54 million to $165 million. Production revenue as a percentage of production volume, which includes unrealized gains and losses on our mortgage commitment pipeline and related hedges, increased 321 basis points to (0.38) percent. Mortgage servicing revenue increased $952 thousand following recent acquisitions of mortgage servicing rights.

Table 5 – Mortgage Banking Revenue 

(Dollars in thousands)

	Three Months Ended						Increase (Decrease)			% Increase (Decrease)		Three Months Ended Mar. 31, 2022			Increase (Decrease)			% Increase (Decrease)
	Mar. 31, 2023			Dec. 31, 2022
Mortgage production revenue	$	(633)		$	(3,983)		$	3,350		84	%	$	5,055		$	(5,688)		(113)	%
Mortgage loans funded for sale	$	138,624		$	141,090							$	418,866
Add: Current period end outstanding commitments	71,693			45,492								160,260
Less: Prior period end outstanding commitments	45,492			75,779								171,412
Total mortgage production volume	$	164,825		$	110,803		$	54,022		49	%	$	407,714		$	(242,889)		(60)	%
Mortgage loan refinances to mortgage loans funded for sale	9		%	10		%	(100)		bps			45		%	(3,600)		bps
Realized margin on funded mortgage loans	(1.25)		%	(1.10)		%	(15)		bps			1.64		%	(289)		bps
Production revenue as a percentage of production volume	(0.38)		%	(3.59)		%	321		bps			1.24		%	(162)		bps
Primary mortgage interest rates:
Average	6.33		%	6.63		%	(30)		bps			3.82		%	251		bps
Period end	6.24		%	6.41		%	(17)		bps			4.67		%	157		bps
Mortgage servicing revenue	$	15,000		$	14,048		$	952		7	%	$	11,595		$	3,405		29	%
Average outstanding principal balance of mortgage loans serviced for others	21,121,319			18,923,078			2,198,241			12	%	16,155,329			4,965,990			31	%
Average mortgage servicing revenue rates	0.29		%	0.29		%	—		bp			0.29		%	—		bp

Primary rates disclosed in Table 5 above represent rates generally available to borrowers on 30 year conforming mortgage loans.

Net gains on other assets, securities and derivatives

Net gains on other assets were $2.3 million for the first quarter of 2023 compared to net gains of $8.4 million in the fourth quarter of 2022. The current quarter included write-downs on certain alternative investments and changes in the value of deferred compensation investments, which are held to offset the cost of various employee benefit programs.

As discussed in the Market Risk section following, the fair value of our mortgage servicing rights ("MSRs") changes in response to changes in primary mortgage loan rates and other assumptions. We attempt to mitigate the earnings volatility caused by changes in the fair value of MSRs by designating certain financial instruments as an economic hedge. Changes in the fair value of these instruments are generally expected to partially offset changes in the fair value of MSRs.

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Table 6 – Gain (Loss) on Mortgage Servicing Rights

(In thousands)

	Three Months Ended
	Mar. 31, 2023		Dec. 31, 2022		Mar. 31, 2022
Gain (loss) on mortgage hedge derivative contracts, net	$	(1,711)	$	4,373	$	(46,694)
Loss on fair value option securities, net	(2,962)		(2,568)		(11,201)
Gain (loss) on economic hedge of mortgage servicing rights, net	(4,673)		1,805		(57,895)
Gain (loss) on change in fair value of mortgage servicing rights	(6,059)		(2,904)		49,110
Loss on changes in fair value of mortgage servicing rights, net of economic hedges included in other operating revenue	(10,732)		(1,099)		(8,785)
Net interest revenue on fair value option securities1	187		(118)		383
Total economic cost of changes in the fair value of mortgage servicing rights, net of economic hedges	$	(10,545)	$	(1,217)	$	(8,402)

1    Actual interest earned on fair value option securities less internal transfer-priced cost of funds.

Other Operating Expense

Other operating expense for the first quarter of 2023 totaled $305.8 million, a decrease of $12.6 million compared to the fourth quarter of 2022.

Table 7 – Other Operating Expense

(Dollars in thousands)

	Three Months Ended				Increase (Decrease)		% Increase (Decrease)		Three Months Ended Mar. 31, 2022		Increase (Decrease)		% Increase (Decrease)
	Mar. 31, 2023		Dec. 31, 2022
Regular compensation	$	105,118	$	102,943	$	2,175	2	%	$	96,474	$	8,644	9	%
Incentive compensation:
Cash-based	41,735		54,295		(12,560)		(23)	%	34,444		7,291		21	%
Share-based	5,257		3,107		2,150		69	%	3,304		1,953		(59)	%
Deferred compensation	1,710		3,864		(2,154)		N/A		(2,124)		3,834		N/A
Total incentive compensation	48,702		61,266		(12,564)		(21)	%	35,624		13,078		37	%
Employee benefits	28,325		22,210		6,115		28	%	27,130		1,195		4	%
Total personnel expense	182,145		186,419		(4,274)		(2)	%	159,228		22,917		14	%
Business promotion	8,569		7,470		1,099		15	%	6,513		2,056		32	%
Charitable contributions to BOKF Foundation	—		2,500		(2,500)		N/A		—		—		N/A
Professional fees and services	13,048		18,365		(5,317)		(29)	%	11,413		1,635		14	%
Net occupancy and equipment	28,459		29,227		(768)		(3)	%	30,855		(2,396)		(8)	%
Insurance	7,315		4,677		2,638		56	%	4,283		3,032		71	%
Data processing and communications	44,802		43,048		1,754		4	%	39,836		4,966		12	%
Printing, postage and supplies	3,893		3,890		3		—	%	3,689		204		6	%
Amortization of intangible assets	3,391		3,736		(345)		(9)	%	3,964		(573)		(14)	%
Mortgage banking costs	5,782		9,016		(3,234)		(36)	%	7,877		(2,095)		(27)	%
Other expense	8,408		10,108		(1,700)		(17)	%	9,960		(1,552)		(16)	%
Total other operating expense	$	305,812	$	318,456	$	(12,644)	(4)	%	$	277,618	$	28,194	10	%
Average number of employees (full-time equivalent)	4,796		4,791		5		—	%	4,712		84		2	%

Certain percentage increases (decreases) are not meaningful for comparison purposes.

- 9 -

Personnel expense

Personnel expense decreased $4.3 million compared to the fourth quarter of 2022. Cash-based incentive compensation decreased $12.6 million, largely due to a one-time incentive given to employees in the fourth quarter of 2022. Deferred compensation expense, which is largely offset by changes in the value of related deferred compensation investments, decreased $2.2 million. Share-based compensation expense increased $2.2 million due to changes in vesting assumptions of certain performance-based equity awards. Regular compensation increased $2.2 million along with our annual merit increases in March. Employee benefits expense was up $6.1 million primarily due to a seasonal increase in payroll taxes.

Non-personnel operating expense

Non-personnel expense totaled $123.7 million for the first quarter of 2023, a decrease of $8.4 million compared to the fourth quarter of 2022. Professional fees and services decreased $5.3 million, primarily due to reduced legal fees and lower technology project costs. Mortgage banking costs decreased $3.2 million from lower prepayments and reduced accruals related to default servicing and loss mitigation costs. The fourth quarter of 2022 also included a $2.5 million charitable donation to the BOKF Foundation. These decreases were partially offset by $2.6 million more in FDIC insurance expenses from higher assessment rates.

Income Taxes

The effective tax rate was 22.0 percent for the first quarter of 2023, 22.1 percent for the fourth quarter of 2022 and 20.6 percent for the first quarter of 2022. The effective tax rate was relatively consistent with the prior quarter and increased compared to the first quarter of 2022, primarily due to an increase in forecasted and actual pre-tax income.

Lines of Business

We operate three principal lines of business: Commercial Banking, Consumer Banking and Wealth Management. Commercial Banking includes lending, treasury and cash management services and customer risk management products for small businesses, middle market and larger commercial customers. Commercial Banking also includes the TransFund EFT network. Consumer Banking includes retail lending and deposit services, lending and deposit services to small business customers served through our consumer branch network and all mortgage banking activities. Wealth Management provides fiduciary services, private banking services, insurance and investment advisory services in all markets. Wealth Management also underwrites state and municipal securities and engages in brokerage and trading activities.

In addition to our lines of business, we have a Funds Management unit. The primary purpose of this unit is to manage our overall liquidity needs and interest rate risk. Each line of business borrows funds from and provides funds to the Funds Management unit as needed to support their operations. Operating results for Funds Management and other include the effect of interest rate risk positions and risk management activities, securities gains and losses including impairment charges, the provision for credit losses in excess of net loans charged off, tax planning strategies and certain executive compensation costs that are not attributed to the lines of business.

We allocate resources and evaluate the performance of our lines of business using the net direct contribution, which includes the allocation of funds and capital costs. Credit costs are attributed to the lines of business based on net loans charged off or recovered. The difference between credit costs attributed to the lines of business and the consolidated provision for credit losses is attributed to Funds Management. In addition, we measure the performance of our business lines after allocations of certain indirect expenses and taxes based on statutory rates.

The cost of funds borrowed from the Funds Management unit by the operating lines of business is transfer priced at rates that approximate market rates for funds with similar repricing and cash flow characteristics. Market rates are generally based on the applicable wholesale borrowing rates or interest rate swap rates, adjusted for prepayment risk and liquidity risk. This method of transfer-pricing funds that support assets of the operating lines of business tends to insulate them from interest rate risk.

- 10 -

The value of funds provided by the operating lines of business to the Funds Management unit is also based on rates that approximate wholesale market rates for funds with similar repricing and cash flow characteristics. Market rates are generally based on a proxy of wholesale borrowing rates or interest rate swap rates. The funds credit formula applied to deposit products with indeterminate maturities is established based on their repricing characteristics reflected in a combination of the short-term wholesale funding rate and a moving average of an intermediate term swap rate, with an appropriate spread applied to both. Shorter duration products are weighted towards the short term wholesale funding rates and longer duration products are weighted towards the intermediate swap rates. The expected duration ranges from 30 days for certain rate-sensitive deposits to five years. In order to appropriately reflect the organizational value of these deposits to the lines of business, annual adjustments are made to the funds credit formula each January that attribute more or less deposit credit value to the business lines dependent upon historical and forward-looking interest rate expectations, which are then held constant throughout the remainder of the year. After several years of decreased funding credits provided to business lines from a sustained low interest rate environment, increases in short-term and long-term rates in response to the Federal Reserve's actions to control inflation caused a commensurate increase in funding credits to business lines in the first quarter of 2023, with the offset to Funds Management and other.

Economic capital is assigned to the business units by a capital allocation model that reflects management's assessment of risk. This model assigns capital based upon credit, operating, interest rate and other market risk inherent in our business lines and recognizes the diversification benefits among the units. The level of assigned economic capital is a combination of the risk taken by each business line based on its actual exposures and calibrated to its own loss history where possible. Average invested capital includes economic capital and amounts we have invested in the lines of business.

As shown in Table 8, net income attributable to our lines of business increased $89.8 million compared to the fourth quarter of 2022. Net interest revenue increased $109.4 million, primarily due to the increased value of deposits and loan growth. Net charge-offs decreased $14.7 million to $1.2 million in the first quarter of 2023. Other operating revenue decreased $7.9 million, largely due to a lower volume of U.S. agency residential mortgage-backed securities trading activity caused by high market volatility, partially offset by an increase in mortgage banking revenue. Operating expense decreased $10.7 million due to a combination of lower incentive compensation costs and a reduction in professional fees and mortgage banking costs. The decrease in net income attributed to Funds Management and other is largely due to adjustments made that attribute more deposit credit value to the business lines, with the offset to Funds Management and other.

Table 8 – Net Income by Line of Business

(Dollars in thousands)

	Three Months Ended				Increase (Decrease)		% Increase (Decrease)		Three Months Ended Mar. 31, 2022		Increase (Decrease)		% Increase (Decrease)
	Mar. 31, 2023		Dec. 31, 2022
Commercial Banking	$	176,547	$	139,374	$	37,173	27	%	$	82,344	$	94,203	114	%
Consumer Banking	50,687		8,996		41,691		463	%	(7,317)		58,004		(793)	%
Wealth Management	52,427		41,447		10,980		26	%	(4,521)		56,948		(1,260)	%
Subtotal	279,661		189,817		89,844		47	%	70,506		209,155		297	%
Funds Management and other	(117,293)		(21,388)		(95,905)		N/A		(8,018)		(109,275)		N/A
Total	$	162,368	$	168,429	$	(6,061)	(4)	%	$	62,488	$	99,880	160	%

Certain percentage increases (decreases) in non-fees and commissions revenue are not meaningful for comparison purposes based on the nature of the item.

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Commercial Banking

Commercial Banking contributed $176.5 million to consolidated net income in the first quarter of 2023, an increase of $37.2 million or 27 percent compared to the fourth quarter of 2022.

Table 9 – Commercial Banking

(Dollars in thousands)

	Three Months Ended				Increase (Decrease)		% Increase (Decrease)		Three Months Ended Mar. 31, 2022		Increase (Decrease)		% Increase (Decrease)
	Mar. 31, 2023		Dec. 31, 2022
Net interest revenue from external sources	$	287,646	$	271,615	$	16,031	6	%	$	147,590	$	140,056	95	%
Net interest expense from internal sources	(21,101)		(38,781)		17,680		46	%	(10,579)		(10,522)		(99)	%
Total net interest revenue	266,545		232,834		33,711		14	%	137,011		129,534		95	%
Net loans charged off	76		14,411		(14,335)		(99)	%	5,343		(5,267)		(99)	%
Net interest revenue after net loans charged off	266,469		218,423		48,046		22	%	131,668		134,801		102	%
Fees and commissions revenue	55,835		58,881		(3,046)		(5)	%	56,964		(1,129)		(2)	%
Other gains, net	1,010		3,213		(2,203)		N/A		463		547		N/A
Other operating revenue	56,845		62,094		(5,249)		(8)	%	57,427		(582)		(1)	%
Personnel expense	43,074		48,366		(5,292)		(11)	%	38,927		4,147		11	%
Non-personnel expense	30,430		31,356		(926)		(3)	%	26,187		4,243		16	%
Other operating expense	73,504		79,722		(6,218)		(8)	%	65,114		8,390		13	%
Net direct contribution	249,810		200,795		49,015		24	%	123,981		125,829		101	%
Gain (loss) on financial instruments, net	(58)		140		(198)		N/A		(204)		146		N/A
Gain on repossessed assets, net	859		978		(119)		N/A		1,793		(934)		N/A
Corporate expense allocations	17,729		18,007		(278)		(2)	%	16,246		1,483		9	%
Income before taxes	232,882		183,906		48,976		27	%	109,324		123,558		113	%
Federal and state income tax	56,335		44,532		11,803		27	%	26,980		29,355		109	%
Net income	$	176,547	$	139,374	$	37,173	27	%	$	82,344	$	94,203	114	%
Average assets	$	28,162,934	$	28,373,856	$	(210,922)	(1)	%	$	29,823,905	$	(1,660,971)	(6)	%
Average loans	18,750,426		18,254,559		495,867		3	%	16,696,428		2,053,998		12	%
Average deposits	15,861,285		16,832,244		(970,959)		(6)	%	19,595,260		(3,733,975)		(19)	%
Average invested capital	2,133,459		2,107,241		26,218		1	%	2,020,925		112,534		6	%

Certain percentage increases (decreases) in non-fees and commissions revenue are not meaningful for comparison purposes based on the nature of the item.

Net interest revenue increased $33.7 million or 14 percent over the fourth quarter of 2022, primarily due to increased value of deposits and loan growth. Net loans charged-off decreased $14.3 million to $76 thousand in the first quarter of 2023.

Fees and commissions revenue decreased $3.0 million or 5 percent, largely due to reduced investment banking revenue related to timing and volume of transactions, combined with a decline in transaction card revenue. Operating expense decreased $6.2 million or 8 percent compared to the fourth quarter of 2022, largely due to reduced incentive compensation expense. Corporate expense allocations were consistent with the prior quarter.

Average outstanding balance of loans attributed to Commercial Banking increased $496 million or 3 percent over the fourth quarter of 2022 to $18.8 billion. See the Loans section of Management's Discussion and Analysis of Financial Condition following for additional discussion of changes in commercial and commercial real estate loans, which are primarily attributed to the Commercial Banking segment. 

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Average deposits attributed to Commercial Banking were $15.9 billion for first quarter of 2023, a $971 million decrease compared to the fourth quarter of 2022. See Management's Discussion and Analysis of Financial Condition and Results of Operations – Liquidity and Capital for further discussion of changes.

Consumer Banking

Consumer Banking provides retail banking services through four primary distribution channels: traditional branches, the 24-hour ExpressBank call center, Internet banking and mobile banking. Consumer Banking also conducts mortgage banking activities through offices located outside of our Consumer Banking markets.

Consumer Banking contributed $50.7 million to consolidated net income for the first quarter of 2023, an increase of $41.7 million or 463 percent over the prior quarter. Growth in net interest revenue due to an increase in the spread on deposits sold to our Funds Management unit was partially offset by changes in the fair value of mortgage servicing rights, net of economic hedges.

Table 10 – Consumer Banking

(Dollars in thousands)

	Three Months Ended				Increase (Decrease)		% Increase (Decrease)		Three Months Ended Mar. 31, 2022		Increase (Decrease)		% Increase (Decrease)
	Mar. 31, 2023		Dec. 31, 2022
Net interest revenue from external sources	$	21,146	$	18,464	$	2,682	15	%	$	16,915	$	4,231	25	%
Net interest revenue from internal sources	88,235		34,838		53,397		153	%	10,292		77,943		757	%
Total net interest revenue	109,381		53,302		56,079		105	%	27,207		82,174		302	%
Net loans charged off	1,184		1,544		(360)		(23)	%	1,112		72		6	%
Net interest revenue after net loans charged off	108,197		51,758		56,439		109	%	26,095		82,102		315	%
Fees and commissions revenue	30,581		27,618		2,963		11	%	33,977		(3,396)		(10)	%
Other gains (losses), net	29		(35)		64		N/A		(16)		45		N/A
Other operating revenue	30,610		27,583		3,027		11	%	33,961		(3,351)		(10)	%
Personnel expense	21,362		22,446		(1,084)		(5)	%	20,984		378		2	%
Non-personnel expense	28,836		32,080		(3,244)		(10)	%	27,805		1,031		4	%
Total other operating expense	50,198		54,526		(4,328)		(8)	%	48,789		1,409		3	%
Net direct contribution	88,609		24,815		63,794		257	%	11,267		77,342		686	%
Gain (loss) on financial instruments, net	(4,673)		1,805		(6,478)		N/A		(57,895)		53,222		N/A
Change in fair value of mortgage servicing rights	(6,059)		(2,904)		(3,155)		N/A		49,110		(55,169)		N/A
Gain on repossessed assets, net	14		—		14		N/A		45		(31)		N/A
Corporate expense allocations	11,618		11,972		(354)		(3)	%	12,080		(462)		(4)	%
Income (loss) before taxes	66,273		11,744		54,529		464	%	(9,553)		75,826		(794)	%
Federal and state income tax	15,586		2,748		12,838		467	%	(2,236)		17,822		(797)	%
Net income (loss)	$	50,687	$	8,996	$	41,691	463	%	$	(7,317)	$	58,004	(793)	%
Average assets	$	9,934,511	$	10,078,381	$	(143,870)	(1)	%	$	10,273,890	$	(339,379)	(3)	%
Average loans	1,747,237		1,725,555		21,682		1	%	1,672,346		74,891		4	%
Average deposits	8,248,541		8,617,085		(368,544)		(4)	%	8,746,622		(498,081)		(6)	%
Average invested capital	261,485		256,905		4,580		2	%	255,758		5,727		2	%

Certain percentage increases (decreases) in non-fees and commissions revenue are not meaningful for comparison purposes based on the nature of the item.

- 13 -

Net interest revenue from Consumer Banking activities increased $56.1 million or 105 percent compared to the fourth quarter of 2022, mainly due to an increase in the spread on deposits sold to our Funds Management unit.

Operating revenue increased $3.0 million or 11 percent due to an increase in mortgage banking revenue as mortgage originations were up following seasonal declines in the prior quarter. Mortgage production volume increased $54.0 million to $164.8 million. Operating expense declined $4.3 million or 8 percent. Lower prepayments and decreased accruals related to default servicing and loss mitigations costs led to a $3.2 million reduction in mortgage banking costs. Personnel expense also decreased $1.1 million. The net cost of the changes in fair value of mortgage servicing rights and related economic hedges was $10.5 million for the first quarter of 2023 compared to a net cost of $1.2 million for the fourth quarter of 2022. Corporate expense allocations were consistent with the fourth quarter of 2022.

Average loans increased $21.7 million or 1 percent to $1.7 billion over the previous quarter. Average deposits attributed to the Consumer Banking segment decreased $369 million or 4 percent to $8.2 billion compared to the fourth quarter of 2022.

- 14 -

Wealth Management

Wealth Management contributed $52.4 million to consolidated net income in the first quarter of 2023, an increase of $11.0 million or 26 percent over the fourth quarter of 2022, largely due to an increase in the spread on deposits sold to our Funds Management unit, which was partially offset by a decrease in revenue from institutional trading activities.

Table 11 – Wealth Management

(Dollars in thousands)

	Three Months Ended				Increase (Decrease)		% Increase (Decrease)		Three Months Ended Mar. 31, 2022		Increase (Decrease)		% Increase (Decrease)
	Mar. 31, 2023		Dec. 31, 2022
Net interest revenue from external sources	$	20,940	$	25,585	$	(4,645)	(18)	%	$	56,231	$	(35,291)	(63)	%
Net interest revenue (expense) from internal sources	33,166		8,913		24,253		272	%	(465)		33,631		7,232	%
Total net interest revenue	54,106		34,498		19,608		57	%	55,766		(1,660)		(3)	%
Net loans recovered	(24)		(22)		(2)		(9)	%	(71)		47		66	%
Net interest revenue after net loans recovered	54,130		34,520		19,610		57	%	55,837		(1,707)		(3)	%
Fees and commissions revenue	108,911		114,630		(5,719)		(5)	%	25,023		83,888		335	%
Other losses, net	—		(20)		20		N/A		(5)		5		N/A
Other operating revenue	108,911		114,610		(5,699)		(5)	%	25,018		83,893		335	%
Personnel expense	59,524		59,041		483		1	%	52,951		6,573		12	%
Non-personnel expense	22,515		23,170		(655)		(3)	%	21,669		846		4	%
Other operating expense	82,039		82,211		(172)		—	%	74,620		7,419		10	%
Net direct contribution	81,002		66,919		14,083		21	%	6,235		74,767		1,199	%
Gain on financial instruments, net	—		4		(4)		N/A		—		—		N/A
Corporate expense allocations	12,386		12,733		(347)		(3)	%	12,071		315		3	%
Income (loss) before taxes	68,616		54,190		14,426		27	%	(5,836)		74,452		1,276	%
Federal and state income tax	16,189		12,743		3,446		27	%	(1,315)		17,504		1,331	%
Net income (loss)	$	52,427	$	41,447	$	10,980	26	%	$	(4,521)	$	56,948	1,260	%
Average assets	$	11,663,096	$	12,912,630	$	(1,249,534)	(10)	%	$	21,323,795	$	(9,660,699)	(45)	%
Average loans	2,201,622		2,223,275		(21,653)		(1)	%	2,118,780		82,842		4	%
Average deposits	7,432,413		7,888,753		(456,340)		(6)	%	9,619,323		(2,186,910)		(23)	%
Average invested capital	290,369		292,689		(2,320)		(1)	%	305,597		(15,228)		(5)	%

Certain percentage increases (decreases) in non-fees and commissions revenue are not meaningful for comparison purposes based on the nature of the item.

Combined net interest revenue and fee revenue increased $13.9 million or 9 percent over the fourth quarter of 2022, primarily due to an increase in the spread on deposits sold to our Funds Management unit, partially offset by a decrease of $9.0 million in total revenue from institutional trading activities due to reduced U.S. agency residential mortgage-backed securities trading volumes. Investment banking revenue grew $2.0 million due to growth in the size and number of municipal bonds underwritten while other revenue decreased $1.1 million. Operating expense and corporate expense allocations were relatively consistent with the previous quarter.

Average outstanding loans attributed to the Wealth Management segment decreased $21.7 million or 1.0 percent compared to the prior quarter. Average Wealth Management deposits decreased $456 million or 6 percent to $7.4 billion. See Management's Discussion and Analysis of Financial Condition and Results of Operations – Liquidity and Capital for further discussion of changes.

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Financial Condition

Securities

We maintain a securities portfolio to enhance profitability, manage interest rate risk, provide liquidity and comply with regulatory requirements. Securities are classified as trading, held for investment, or available for sale. See Note 2 to the Consolidated Financial Statements for the composition of the securities portfolio as of March 31, 2023 and December 31, 2022.

We hold an inventory of trading securities in support of sales to a variety of customers, including banks, corporations, insurance companies, money managers and others. Trading securities decreased $2.2 billion to $2.3 billion during the first quarter of 2023 in response to lower origination volumes in the residential mortgage industry driven by increases in interest rates. As discussed in the Market Risk section of this report, trading activities involve risk of loss from adverse price movement. We mitigate this risk within board-approved limits through the use of derivative contracts, short-sales and other techniques.

At March 31, 2023, the carrying value of investment (held-to-maturity) securities was $2.4 billion, including a $497 thousand allowance for expected credit losses, compared to $2.5 billion at December 31, 2022 with a $558 thousand allowance for expected credit losses. The fair value of investment securities was $2.3 billion at March 31, 2023, consistent with prior quarter. Investment securities consist primarily of residential mortgage-backed securities issued by U.S. government agencies, intermediate and long-term, fixed rate Oklahoma and Texas municipal bonds, and taxable Texas school construction bonds.

Available for sale securities, which may be sold prior to maturity, are carried at fair value. Unrealized gains or losses, net of deferred taxes, are recorded as accumulated other comprehensive income in shareholders' equity. The amortized cost of available for sale securities totaled $12.7 billion at March 31, 2023, a $320 million increase compared to December 31, 2022. At March 31, 2023, the available for sale securities portfolio consisted primarily of U.S. government agency residential mortgage-backed securities and U.S. government agency commercial mortgage-backed securities. Both residential and commercial mortgage-backed securities have credit risk from delinquency or default of the underlying loans. We mitigate this risk by primarily investing in securities issued by U.S. government agencies. Principal and interest payments on the underlying loans are fully guaranteed. Commercial mortgage-backed securities have prepayment penalties similar to commercial loans.

A primary risk of holding residential mortgage-backed securities comes from extension during periods of rising interest rates or contraction in the form of more rapid prepayments during periods of falling interest rates. We evaluate this risk through extensive modeling of risk both before making an investment and throughout the life of the security. Our best estimate of the duration of the combined residential mortgage-backed securities portfolio held in investment and available for sale securities at March 31, 2023 is 3.5 years, which is 0.3 years longer than the same measure as of December 31, 2022. Management estimates the duration extends to 3.9 years assuming an immediate 200 basis point upward shock. The estimated duration contracts to 2.9 years assuming a 200 basis point decline in the current rate environment. The duration of the total investment portfolio is 3.4 years, extends to 3.6 years in an upward shock of 200 basis points, and contracts to 3.1 years in a down 200 basis point shock scenario. Management also regularly monitors the impact of interest rate risk on the available for sale securities portfolio on our tangible equity ratio under various shock scenarios.

Bank-Owned Life Insurance

We have approximately $409 million of bank-owned life insurance at March 31, 2023. This investment is expected to provide a long-term source of earnings to support existing employee benefit programs. Approximately $314 million is held in separate accounts and $95 million represents the cash surrender value of policies held in general accounts and other amounts due from various insurance companies. Our separate account holdings are invested in diversified portfolios of investment-grade fixed income securities and cash equivalents, including U.S. Treasury and Agency securities, residential mortgage-backed securities, corporate debt, asset-backed and commercial mortgage-backed securities. The portfolios are managed by unaffiliated professional managers within parameters established in the portfolio's investment guidelines. The cash surrender value of certain life insurance policies is further supported by a stable value wrap, which protects against changes in the fair value of the investments. As of March 31, 2023, the fair value of investments held in separate accounts covered by the stable value wrap was approximately $290 million. Since the underlying fair value of the investments held in separate accounts at March 31, 2023 was below the net book value of the investments, $22 million of cash surrender value was supported by the stable value wrap. The remaining $2 million of fair value held in separate accounts is not supported by the stable value wrap. Future rate increases may cause write-downs in the short-term. The stable value wrap is provided by a domestic financial institution. 

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Loans

The aggregate loan portfolio before allowance for loan losses totaled $22.8 billion at March 31, 2023, growing $193 million over December 31, 2022, largely due to growth in commercial real estate loans in the multifamily and industrial loan portfolios.

Table 12 – Loans

(In thousands)

	Mar. 31, 2023		Dec. 31, 2022		Sep. 30, 2022		June 30, 2022		Mar. 31, 2022
Commercial:
Healthcare	$	3,899,341	$	3,845,017	$	3,826,623	$	3,696,963	$	3,441,732
Services	3,563,702		3,431,521		3,280,925		3,421,493		3,351,495
Energy	3,398,057		3,424,790		3,371,588		3,393,072		3,197,667
General business	3,356,249		3,511,171		3,148,783		3,110,309		3,029,660
Total commercial	14,217,349		14,212,499		13,627,919		13,621,837		13,020,554
Commercial real estate:
Multifamily	1,363,881		1,212,883		1,126,700		878,565		867,288
Industrial	1,309,435		1,221,501		1,103,905		953,626		911,928
Office	1,045,700		1,053,331		1,086,615		1,100,115		1,097,516
Retail	618,264		620,518		635,021		637,304		667,561
Residential construction and land development	102,828		95,684		91,690		111,575		120,506
Other commercial real estate	375,208		402,860		429,980		424,963		436,157
Total commercial real estate	4,815,316		4,606,777		4,473,911		4,106,148		4,100,956
Loans to individuals:
Residential mortgage	1,926,027		1,890,784		1,851,836		1,784,729		1,723,506
Residential mortgage guaranteed by U.S. government agencies	224,753		245,940		262,466		293,838		322,581
Personal	1,566,608		1,601,150		1,574,325		1,484,596		1,506,832
Total loans to individuals	3,717,388		3,737,874		3,688,627		3,563,163		3,552,919
Total	$	22,750,053	$	22,557,150	$	21,790,457	$	21,291,148	$	20,674,429

Commercial

Commercial loans represent loans for working capital, facilities acquisition or expansion, purchases of equipment and other needs of commercial customers primarily located within our geographical footprint. These loans are underwritten individually and represent ongoing relationships based on a thorough knowledge of the customer, the customer's industry and market. While commercial loans are generally secured by the customer's assets including real property, inventory, accounts receivable, operating equipment, interests in mineral rights and other property and may also include personal guarantees of the owners and related parties, the primary source of repayment of the loans is the ongoing cash flow from operations of the customer's business. In addition, revolving lines of credit are generally governed by a borrowing base. Inherent lending risks are centrally monitored on a continuous basis from underwriting throughout the life of the loan for compliance with commercial lending policies.

Commercial loans totaled $14.2 billion or 62 percent of the loan portfolio at March 31, 2023, largely unchanged compared to December 31, 2022. Growth in services and healthcare loans were offset by decreases in general business and energy loan balances.

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Approximately 72 percent of loans in this segment are located within our geographic footprint based on collateral location. Loans for which the collateral location is less relevant, such as unsecured loans and reserve-based energy loans are categorized by the borrower's primary operating location. The largest concentration of loans in this segment outside of our footprint is California, totaling 5 percent of the segment.

Supporting the energy industry with loans to producers and other energy-related entities has been a hallmark of the Company since its founding and represents a large portion of our commercial loan portfolio. In addition, energy production and related industries have a significant impact on the economy in our primary markets. Loans collateralized by oil and gas properties are subject to a semi-annual engineering review by our internal staff of petroleum engineers. This review is used as the basis for developing the expected cash flows supporting the loan amount. The projected cash flows are discounted according to risk characteristics of the underlying oil and gas properties. Loans 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 pricing levels and with existing conventional equipment and operating methods and costs. As part of our evaluation of credit quality, we analyze rigorous stress tests over a range of commodity prices and take proactive steps to mitigate risk when appropriate.

Outstanding energy loans totaled $3.4 billion or 15 percent of total loans at March 31, 2023, a $27 million decrease compared to December 31, 2022. Approximately $2.7 billion of energy loans were to oil and gas producers, a $20 million increase over December 31, 2022. The majority of this portfolio is first lien, senior secured, reserve-based lending, which we believe is the lowest risk form of energy lending. Approximately 67 percent of the committed production loans are secured by properties primarily producing oil, and 33 percent of the committed production loans are secured by properties primarily producing natural gas.

Loans to midstream oil and gas companies totaled $519 million at March 31, 2023, a $56 million decrease compared to December 31, 2022. Loans to borrowers that provide services to the energy industry totaled $126 million at March 31, 2023, a decrease of $31 million. Loans to other energy borrowers, including those engaged in wholesale or retail energy sales, totaled $66 million, a $40 million increase over the prior quarter.

Unfunded energy loan commitments were $4.1 billion at March 31, 2023, growing $246 million over December 31, 2022.

The healthcare sector of the loan portfolio totaled $3.9 billion or 17 percent of total loans. Healthcare loans increased $54 million over December 31, 2022, primarily due to growth in loans to senior housing facilities. This was partially offset by a decrease in balances to hospital systems and other medical practices compared to the prior quarter. Healthcare sector loans consist primarily of loans for the development and operation of senior housing and care facilities including independent living, assisted living and skilled nursing. Generally we loan to borrowers with a portfolio of multiple facilities that serves to help diversify risks specific to a single facility.

The services sector of the loan portfolio totaled $3.6 billion or 16 percent of total loans, a $132 million increase compared to the prior quarter. Service sector loans consist of a large number of loans to a variety of businesses including Native American tribal and state and local governments, Native American tribal casino operations, foundations and not-for-profit organizations, educational services and specialty trade contractors. Approximately $1.6 billion of the services category is made up of loans with individual balances of less than $10 million. Services sector loans are generally secured by the assets of the borrower with repayment coming from the cash flows of ongoing operations of the customer's business.

General business loans totaled $3.4 billion or 15 percent of total loans, a decrease of $155 million compared to the prior quarter. General business loans consist of $2.0 billion of wholesale/retail loans and $1.4 billion of loans from other commercial industries.

We participate in shared national credits when appropriate to obtain or maintain business relationships with local customers. Shared national credits are defined by banking regulators as credits of $100 million or more and with three or more non-affiliated banks as participants. At March 31, 2023, the outstanding principal balance of these loans totaled $5.5 billion, including $2.5 billion of energy loans. Substantially all of these loans are to borrowers with local market relationships. We serve as the agent lender in approximately 21 percent of our shared national credits, based on dollars committed. We hold shared national credits to the same standard of analysis and perform the same level of review as internally originated credits. Our lending policies generally avoid loans in which we do not have the opportunity to maintain or achieve other business relationships with the customer. In addition to management's quarterly assessment of credit risk, banking regulators annually review a sample of shared national credits for proper risk grading.

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Commercial Real Estate

Commercial real estate represents loans for the construction of buildings or other improvements to real estate and property held by borrowers for investment purposes generally within our geographical footprint. We require collateral values in excess of the loan amounts, demonstrated cash flows in excess of expected debt service requirements, equity investment in the project and a portion of the project already sold, leased or permanent financing already secured. The expected cash flows from all significant new or renewed income producing property commitments are stress tested to reflect the risks in varying interest rates, vacancy rates and rental rates. As with commercial loans, inherent lending risks are centrally monitored on a continuous basis from underwriting throughout the life of the loan for compliance with applicable lending policies.

The outstanding balance of commercial real estate loans grew by $209 million over December 31, 2022 to $4.8 billion or 21 percent of total loans at March 31, 2023. Multifamily residential loans increased $151 million to $1.4 billion at March 31, 2023. Loans secured by industrial facilities grew by $88 million to $1.3 billion. This growth was partially offset by a $28 million decrease in other real estate loans.

Approximately 68 percent of loans in this segment are in our geographic footprint based on collateral location. The largest concentration of loans in this segment outside our footprint is Utah, totaling 9 percent of the segment. All other states represent less than 5 percent individually.

Unfunded commercial real estate loan commitments were $2.7 billion at March 31, 2023, a decrease of $397 million compared to December 31, 2022. We take a disciplined approach to managing our concentration of commercial real estate loan commitments as a percentage of Tier 1 Capital. While loan commitments are presently at the upper concentration limit, we expect continued growth in our commercial real estate balances as loans fund, primarily in the multifamily and industrial loan portfolios.

Loans to Individuals

Loans to individuals include residential mortgage and personal loans. Residential mortgage loans provide funds for our customers to purchase or refinance their primary residence or to borrow against the equity in their home. These loans are secured by a first or second mortgage on the customer's primary residence. Personal loans consist primarily of loans to Wealth Management clients secured by the cash surrender value of insurance policies and marketable securities. Personal loans also include direct loans secured by and for the purchase of automobiles, recreational and marine equipment as well as unsecured loans. These loans are made in accordance with underwriting policies we believe to be conservative and are fully documented. Loans may be individually underwritten or credit scored based on size and other criteria. Credit scoring is assessed based on significant credit characteristics including credit history, residential and employment stability.

In general, we sell the majority of our conforming fixed-rate loan originations in the secondary market and retain the majority of our non-conforming and adjustable-rate mortgage loans. Our mortgage loan portfolio does not include payment option adjustable-rate mortgage loans or adjustable-rate mortgage loans with initial rates that are below market. Home equity loans are primarily first-lien and fully amortizing.

Residential mortgage loans guaranteed by U.S. government agencies have limited credit exposure because of the agency guarantee. This amount includes residential mortgage loans previously sold into GNMA mortgage pools that the Company may repurchase when certain defined delinquency criteria are met. Because of this repurchase right, the Company is deemed to have regained effective control over these loans and must include them on the Consolidated Balance Sheet.

Loans to individuals totaled $3.7 billion or 16% of the loan portfolio, a decrease of $20.5 million compared to December 31, 2022. Approximately 91 percent of the loans in this segment are secured by collateral located within our geographical footprint. Loans for which the collateral location is less relevant, such as unsecured loans are categorized by the borrower's primary location.

The Company secondarily evaluates loan portfolio performance based on the primary geographical market managing the loan. Loans attributed to a geographical market may not represent the location of the borrower or the collateral. All permanent mortgage loans serviced by our mortgage banking unit and held for investment by the Company are centrally managed by the Oklahoma market.

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Table 13 – Loans Managed by Primary Geographical Market

(In thousands)

	Mar. 31, 2023		Dec. 31, 2022		Sep. 30, 2022		June 30, 2022		Mar. 31, 2022
Texas:
Commercial	$	7,103,166	$	6,878,618	$	6,644,890	$	6,645,698	$	6,286,125
Commercial real estate	1,675,831		1,555,508		1,448,590		1,339,452		1,345,105
Loans to individuals	992,343		982,700		970,459		934,856		957,320
Total Texas	9,771,340		9,416,826		9,063,939		8,920,006		8,588,550
Oklahoma:
Commercial	3,178,934		3,382,577		3,108,608		3,139,093		2,936,530
Commercial real estate	574,708		582,109		608,856		576,458		552,310
Loans to individuals	2,049,472		2,077,124		2,054,362		1,982,247		1,977,886
Total Oklahoma	5,803,114		6,041,810		5,771,826		5,697,798		5,466,726
Colorado:
Commercial	2,148,066		2,149,199		2,117,181		2,082,688		2,006,357
Commercial real estate	646,537		613,912		565,057		473,231		480,740
Loans to individuals	231,368		241,902		237,981		234,105		236,125
Total Colorado	3,025,971		3,005,013		2,920,219		2,790,024		2,723,222
Arizona:
Commercial	1,115,973		1,124,289		1,103,000		1,085,401		1,086,195
Commercial real estate	881,465		860,947		850,319		766,767		719,970
Loans to individuals	240,556		229,872		225,981		212,870		190,746
Total Arizona	2,237,994		2,215,108		2,179,300		2,065,038		1,996,911
Kansas/Missouri:
Commercial	318,782		310,715		307,456		338,910		336,966
Commercial real estate	489,951		479,968		466,955		458,157		436,740
Loans to individuals	129,580		131,307		125,039		125,584		121,247
Total Kansas/Missouri	938,313		921,990		899,450		922,651		894,953
New Mexico:
Commercial	280,945		263,349		258,754		253,825		272,246
Commercial real estate	449,715		417,008		426,367		431,606		504,632
Loans to individuals	65,770		67,163		68,095		67,026		63,299
Total New Mexico	796,430		747,520		753,216		752,457		840,177
Arkansas:
Commercial	71,483		103,752		88,030		76,222		96,135
Commercial real estate	97,109		97,325		107,767		60,477		61,459
Loans to individuals	8,299		7,806		6,710		6,475		6,296
Total Arkansas	176,891		208,883		202,507		143,174		163,890
Total BOK Financial loans	$	22,750,053	$	22,557,150	$	21,790,457	$	21,291,148	$	20,674,429

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Off-Balance Sheet Commitments

We enter into certain off-balance sheet arrangements in the normal course of business as shown in Table 14. Loan commitments may be unconditional obligations to provide financing or conditional obligations that depend on the borrower's financial condition, collateral value or other factors. Standby letters of credit are unconditional commitments to guarantee the performance of our customer to a third party. Since some of these commitments are expected to expire before being drawn upon, the total commitment amounts do not necessarily represent future cash requirements.

We have off-balance sheet commitments related to certain residential mortgage loans sold into mortgage-backed securities as part of our mortgage banking activities. We retain off-balance sheet credit risk related to losses in excess of amounts guaranteed by the U.S. Department of Veterans Affairs ("VA").

We also have off-balance sheet credit risk related to certain residential mortgage loans primarily originated under community development loan programs that were sold to a U.S. government agency with full recourse prior to 2007. We are obligated to repurchase these loans for the life of these loans in the event of foreclosure for the unpaid principal and interest at the time of foreclosure. The majority of our conforming fixed rate loan originations are sold in the secondary market, and we only retain repurchase obligations under standard underwriting representations and warranties.

Table 14 – Off-Balance Sheet Credit Commitments

(In thousands)

	Mar. 31, 2023		Dec. 31, 2022		Sep. 30, 2022		June 30, 2022		Mar. 31, 2022
Loan commitments	$	15,119,984	$	15,424,431	$	14,585,566	$	13,470,286	$	12,490,832
Standby letters of credit	790,316		740,039		725,302		700,929		654,185
Unpaid principal balance of residential mortgage loans sold with recourse	43,510		44,742		46,199		48,775		51,459
Unpaid principal balance of residential mortgage loans transferred into mortgage-backed securities guaranteed by U.S. Dept. of Veterans Affairs	996,139		1,005,368		1,021,504		1,038,317		1,062,197

Customer Derivative Programs

We offer programs that permit our customers to hedge various risks, including fluctuations in energy, cattle and other agricultural product prices, interest rates and foreign exchange rates. Each of these programs work essentially the same way. Derivative contracts are executed between the customers and the Company. Offsetting contracts are executed between the Company and selected counterparties to minimize market risk due to changes in commodity prices, interest rates or foreign exchange rates. The counterparty contracts are identical to the customer contracts except for a fixed pricing spread or a fee paid to us as compensation for administrative costs, credit risk and profit.

The customer derivative programs create credit risk for potential amounts due to the Company from our customers and from the counterparties. Customer credit risk is monitored through existing credit policies and procedures. The effects of changes in commodity prices, interest rates or foreign exchange rates are evaluated across a range of possible scenarios to determine the maximum exposure we are willing to have individually to any customer. Customers may also be required to provide cash margin or other collateral in conjunction with our credit agreements to further limit our credit risk.

Counterparty credit risk is evaluated through existing policies and procedures. This evaluation considers the total relationship between BOK Financial and each of the counterparties. Individual limits are established by management, approved by Credit Administration and reviewed by the Asset/Liability Committee. Margin collateral is required if the exposure between the Company and any counterparty exceeds established limits. Based on declines in the counterparties' credit ratings, these limits may be reduced and additional margin collateral may be required.

A deterioration of the credit standing of one or more of the customers or counterparties to these contracts may result in BOK Financial recognizing a loss as the fair value of the affected contracts may no longer move in tandem with the offsetting contracts. This occurs if the credit standing of the customer or counterparty deteriorates such that either the fair value of underlying collateral no longer supports the contract or the customer or the counterparty's ability to provide margin collateral becomes impaired. Credit losses on customer derivatives reduce brokerage and trading revenue in the Consolidated Statements of Earnings.

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Derivative contracts are carried at fair value. At March 31, 2023, the net fair values of derivative contracts, before consideration of cash margin, reported as assets under these programs totaled $572 million compared to $1.0 billion at December 31, 2022. At March 31, 2023, the net fair value of our derivative contracts included $396 million for energy contracts, $118 million for interest rate swaps and $57 million for foreign exchange contracts. The aggregate net fair value of derivative contracts, before consideration of cash margin, held under these programs reported as liabilities totaled $578 million at March 31, 2023 and $1.0 billion at December 31, 2022.

At March 31, 2023, total derivative assets were reduced by $221 million of cash collateral received from counterparties and total derivative liabilities were reduced by $80 million of cash collateral paid to counterparties related to instruments executed with the same counterparty under a master netting agreement. Derivative contracts executed with customers may be secured by non-cash collateral in conjunction with a credit agreement with that customer, such as proven producing oil and gas properties. Access to this collateral in event of default is reasonably assured.

A table showing the notional and fair value of derivative assets and liabilities on both a gross and net basis is presented in Note 3 to the Consolidated Financial Statements.

The fair value of derivative contracts reported as assets under these programs, net of cash margin held by the Company, by category of debtor at March 31, 2023 follows in Table 15.

Table 15 – Fair Value of Derivative Contracts

(In thousands)

Customers	$	147,529
Banks and other financial institutions	48,006
Exchanges and clearing organizations	154,653
Fair value of customer risk management program asset derivative contracts, net	$	350,188

At March 31, 2023, our largest derivative exposure was to an exchange for $152 million of net derivative positions and $53 million of cash margin placed.

Our customer derivative program also introduces liquidity and capital risk. We are required to provide cash margin to certain counterparties when the net negative fair value of the contracts exceeds established limits. Also, changes in commodity prices affect the amount of regulatory capital we are required to hold as support for the fair value of our derivative assets. These risks are modeled as part of the management of these programs. Based on current prices, a decrease in market prices down to an equivalent of $58.98 per barrel of oil would decrease the fair value of derivative assets by $62 million, with lending customers comprising the bulk of the assets. An increase in prices up to an equivalent of $92.36 per barrel of oil would increase the fair value of derivative assets by $389 million as asset values rise faster than margin paid. Liquidity requirements of this program may also be affected by our credit rating. At March 31, 2023, a decrease in our credit rating to below investment grade would increase our obligation to post cash margin on existing contracts by approximately $10 million. The fair value of our to-be-announced residential mortgage-backed securities and interest rate swap derivative contracts is affected by changes in interest rates. Based on our assessment as of March 31, 2023, changes in interest rates would not materially impact regulatory capital or liquidity needed to support this portion of our customer derivative program.

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Summary of Credit Loss Experience

Table 16 – Summary of Credit Loss Experience

(Dollars in thousands)

	Three Months Ended
	Mar. 31, 2023			Dec. 31, 2022			Sep. 30, 2022			June 30, 2022			Mar. 31, 2022
Allowance for loan losses:
Beginning balance	$	235,704		$	241,768		241,114			246,473			256,421
Loans charged off	(3,667)			(17,807)			(1,766)			(1,368)			(7,805)
Recoveries of loans previously charged off	2,898			2,301			1,309			2,167			1,824
Net loans recovered (charged off)	(769)			(15,506)			(457)			799			(5,981)
Provision for credit losses	14,525			9,442			1,111			(6,158)			(3,967)
Ending balance	$	249,460		$	235,704		$	241,768		$	241,114		$	246,473
Accrual for off-balance sheet credit risk from unfunded loan commitments:
Beginning balance	$	60,919		$	56,310		42,250			36,245			32,977
Provision for credit losses	2,024			4,609			14,060			6,005			3,268
Ending balance	$	62,943		$	60,919		$	56,310		$	42,250		$	36,245
Accrual for off-balance sheet credit risk associated with mortgage banking activities:
Beginning balance	$	4,904		$	3,885		4,003			3,997			3,382
Loans charged off	(35)			16			(52)			(63)			(6)
Provision for credit losses	(488)			1,003			(66)			69			621
Ending balance	$	4,381		$	4,904		$	3,885		$	4,003		$	3,997
Allowance for credit losses related to held-to-maturity (investment) securities:
Beginning balance	$	558		$	612		$	717		$	633		$	555
Provision for credit losses	(61)			(54)			(105)			84			78
Ending balance	$	497		$	558		$	612		$	717		$	633
Total provision for credit losses	$	16,000		$	15,000		$	15,000		$	—		$	—
Average loans by portfolio segment :
Commercial	$	14,046,237		$	13,846,339		$	13,508,325		$	13,472,488		$	12,887,816
Commercial real estate	4,757,362			4,488,091			4,434,650			4,061,129			4,059,148
Loans to individuals	3,672,648			3,641,574			3,656,257			3,524,097			3,516,698
Net charge-offs (annualized) to average loans	0.01		%	0.28		%	0.01		%	(0.02)		%	0.12		%
Net charge-offs (annualized) to average loans by portfolio segment:
Commercial	(0.06)		%	0.42		%	(0.02)		%	(0.05)		%	0.17		%
Commercial real estate	0.17		%	—		%	—		%	0.01		%	—		%
Loans to individuals	0.07		%	0.12		%	0.12		%	0.08		%	0.05		%
Recoveries to gross charge-offs	79.03		%	12.92		%	74.12		%	158.41		%	23.37		%
Provision for loan losses (annualized) to average loans	0.26		%	0.17		%	0.02		%	(0.12)		%	(0.08)		%
Allowance for loan losses to loans outstanding at period-end	1.10		%	1.04		%	1.11		%	1.13		%	1.19		%
Accrual for unfunded loan commitments to loan commitments	0.42		%	0.39		%	0.39		%	0.31		%	0.29		%
Combined allowance for loan losses and accrual for off-balance sheet credit risk from unfunded loan commitments to loans outstanding at period-end	1.37		%	1.31		%	1.37		%	1.33		%	1.37		%

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Allowance for Loan Losses and Accrual for Off-Balance Sheet Credit Risk from Unfunded Loan Commitments

Expected credit losses on assets carried at amortized cost are recognized over their expected lives based on models that measure the probability of default and loss given default over a 12-month reasonable and supportable forecast period. Models incorporate base case, downside and upside macroeconomic variables such as real gross domestic product ("GDP") growth, civilian unemployment rate and West Texas Intermediate ("WTI") oil prices on a probability weighted basis. See Note 4 to the Consolidated Financial Statements for additional discussion of methodology of allowance for loan losses.

A $16.0 million provision for credit losses was necessary for the first quarter of 2023, as key economic assumptions in the base case, including projected WTI oil prices and commercial real estate vacancy rates, were less favorable to economic growth. Non-pass grade loans, including loans especially mentioned, accruing substandard and nonaccruing loans increased $107 million compared to December 31, 2022. Increases to non-pass grade general business, healthcare, commercial real estate and services loans were partially offset by decreased non-pass grade energy loans. A summary of outstanding loan balances by risk grade is included in Note 4 to the Consolidated Financial Statements.

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A summary of macroeconomic variables considered in developing our estimate of expected credit losses at March 31, 2023 follows:

	Base	Downside	Upside
Scenario probability weighting	50%	40%	10%
Economic outlook	The Russia-Ukraine conflict remains isolated and stress in the banking sector does not become widespread. There is one federal funds rate increase at the Federal Reserve Open Market ("FOMC") meeting in the second quarter of 2023, which results in a target range of 5.00 percent to 5.25 percent. There are no additional rate increases in 2023. Inflation continues to improve from the peaks experienced in 2022, reaching 3.0 percent by the end of 2023. Inflation pressures cause modest declines in real household income compared to pre-pandemic levels, resulting in below-trend GDP growth. Job openings revert to more normalized levels and overall hiring levels decline, causing the national unemployment rate to modestly increase over the next four quarters.	The Russia-Ukraine conflict remains isolated and stress in the banking sector does not become widespread. Higher levels of inflation force the Federal Reserve to adopt a more aggressive monetary policy compared to the base case scenario. This results in a target range of 5.75 percent to 6.00 percent by first quarter of 2024. This pushes the United States into a recession, with a contraction in economic activity and a sharp increase in the unemployment rate. Inflation moderates slightly from peaks in 2022 and remains elevated through the forecast horizon, ending 2023 at 5.0 percent.	The Russia-Ukraine conflict remains isolated and stress in the banking sector does not become widespread. There are no additional rate increases in 2023 and the terminal range of 4.75 percent to 5.00 percent is held flat for the remainder of the forecast horizon. Inflation continues to improve from the peaks experienced in 2022 and reaches 2.5 percent by the end of 2023. Labor force participants continue to re-enter the job market to help fill the elevated level of job openings. The increase in employment helps maintain household income above its pre-pandemic trend. This, coupled with the drawdown in savings, supports consumer spending and produces GDP growth consistent with pre-pandemic levels.
Macro-economic factors	–GDP is forecasted to grow by 0.70 percent over the next 12 months. –Civilian unemployment rate of 3.8 percent in the second quarter of 2023 increases to 4.1 percent by the first quarter of 2024. –WTI oil prices are projected to generally follow the NYMEX forward curve that existed at the end of March 2023 and are expected to average $69.18 per barrel over the next 12 months.	–GDP is forecasted to contract 2.0 percent over the next twelve months. –Civilian unemployment rate of 4.7 percent in the second quarter of 2023 increases to 6.0 percent in the first quarter of 2024. –WTI oil prices are projected to average $58.02 over the next 12 months, with a peak of $62.53 in the second quarter of 2023 and falling 17 percent over the following three quarters.	–GDP is forecasted to grow by 1.5 percent over the next 12 months. –Civilian unemployment rate of 3.6 percent in the second quarter of 2023 increases to 3.8 percent by the first quarter of 2024. –WTI oil prices are projected to average $73.65 per barrel over the next 12 months.

The sensitivity to management's economic scenario weighting may be quantified by comparing the results of weighting each

economic scenario at 100%. For example, compared to a 100% Base Case scenario, a 100% Downside Case would result in an

additional $129 million in quantitative reserve, while a 100% Upside Case would results in $14 million less quantitative reserve at March 31, 2023. Such sensitivity calculations do not necessarily reflect the nature and extent of future changes in the related allowance.

At March 31, 2023, the allowance for loan losses totaled $249 million or 1.10 percent of outstanding loans. Excluding residential mortgage loans guaranteed by U.S. government agencies, the allowance for loan losses was 235 percent of nonaccruing loans. The combined allowance for loan losses and accrual for off-balance sheet credit risk from unfunded loan commitments was $312 million or 1.37 percent of outstanding loans and 295 percent of nonaccruing loans at March 31, 2023.

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The Company recorded a $15.0 million provision for credit losses in the fourth quarter of 2022. At December 31, 2022, the allowance for loan losses was $236 million or 1.04 percent of outstanding loans. Excluding residential mortgage loans guaranteed by U.S. government agencies, the allowance for loan losses was 221 percent of nonaccruing loans. The combined allowance for loan losses and accrual for off-balance sheet credit risk from unfunded loan commitments was $297 million or 1.31 percent of outstanding loans and 278 percent of nonaccruing loans.

Net Loans Charged Off

Net recoveries of commercial loans were $2.0 million in the first quarter of 2023. Net charge-offs of commercial real estate loans were $2.1 million and net charge-offs of loans to individuals were $680 thousand. Net charge-offs of loans to individuals include deposit account overdraft losses.

Accrual for Off-Balance Sheet Credit Risk Associated with Mortgage Banking Activities

The accrual for off-balance sheet credit risk associated with mortgage banking activities includes consideration of credit risk related to certain residential mortgage loans sold into mortgage-backed securities in excess of amounts guaranteed by the U.S. Department of Veteran's Affairs ("VA") and mortgage loans originated under community development loan programs that were sold to a U.S. government agency with full recourse.

We use publicly available long-term national data to estimate total loss given default for our off-balance sheet credit risk related to losses in excess of amounts guaranteed by the VA. This result is combined with probability of default output from our mortgage servicing rights model to estimate total expected loss. Then, we estimate the VA's guarantee percentage to determine our portion of the credit risk. Qualitative adjustment may be used, if necessary.

Allowance for Credit Losses Related to Held-to-Maturity (Investment) Securities

The expected credit losses principles apply to all financial assets measured at cost, including our held-to-maturity (investment) debt securities portfolio. Our investment portfolio includes municipal and other tax-exempt securities and other debt securities. Expected credit losses for these assets is based on probability of default and loss given default assumptions that align with similarly graded loans. Qualitative adjustment may be used, if necessary.

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Nonperforming Assets

As more fully described in Note 4 to the Consolidated Financial Statements, loans are generally classified as nonaccruing when it becomes probable that we will not collect the full contractual principal and interest. Accruing renegotiated loans guaranteed by U.S. government agencies represent residential mortgage loans that have been modified in troubled debt restructurings. Interest continues to accrue based on the modified terms of the loan and loans may be sold once they become eligible according to U.S. government agency guidelines. The Company adopted FASB Accounting Standards Update No. 2022-02, Financial Instruments - Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures, which eliminates designation of these loans as troubled debt restructurings effective January 1, 2023. Real estate and other repossessed assets are assets acquired in partial or total forgiveness of loans. The assets are carried at the lower of cost as determined by fair value at the date of foreclosure or current fair value, less estimated selling costs. A summary of nonperforming assets follows in Table 17:

Table 17 – Nonperforming Assets

(Dollars in thousands)

	Mar. 31, 2023			Dec. 31, 2022			Sep. 30, 2022			June 30, 2022			Mar. 31, 2022
Nonaccruing loans:
Commercial:
Healthcare	$	37,247		$	41,034		$	41,438		$	14,886		$	15,076
Services	8,097			16,228			27,315			15,259			16,535
Energy	127			1,399			4,164			20,924			24,976
General business	8,961			1,636			2,753			3,539			3,750
Total commercial	54,432			60,297			75,670			54,608			60,337
Commercial real estate	21,668			16,570			7,971			10,939			15,989
Loans to individuals:
Residential mortgage	29,693			29,791			30,066			30,460			30,757
Residential mortgage guaranteed by U.S. government agencies	14,302			15,005			16,957			18,000			16,992
Personal	200			134			136			132			171
Total loans to individuals	44,195			44,930			47,159			48,592			47,920
Total nonaccruing loans	120,295			121,797			130,800			114,139			124,246
Accruing renegotiated loans guaranteed by U.S. government agencies1	—			163,535			176,022			196,420			204,121
Real estate and other repossessed assets	12,651			14,304			29,676			22,221			24,492
Total nonperforming assets	$	132,946		$	299,636		$	336,498		$	332,780		$	352,859
Total nonperforming assets excluding those guaranteed by U.S. government agencies	$	118,644		$	121,096		$	143,519		$	118,360		$	131,746
Allowance for loan losses to nonaccruing loans2	235.36		%	220.71		%	212.37		%	250.80		%	229.80		%
Combined allowance for loan losses and accrual for off-balance sheet credit risk from unfunded loan commitments to nonaccruing loans2	294.74		%	277.76		%	261.83		%	294.74		%	263.60		%
Nonperforming assets to outstanding loans and repossessed assets	0.58		%	1.33		%	1.54		%	1.56		%	1.70		%
Nonperforming assets to outstanding loans and repossessed assets2	0.53		%	0.54		%	0.67		%	0.56		%	0.65		%
Nonaccruing loans to outstanding loans	0.53		%	0.54		%	0.60		%	0.54		%	0.60		%
Nonaccruing commercial loans to outstanding commercial loans	0.38		%	0.42		%	0.56		%	0.40		%	0.46		%
Nonaccruing commercial real estate loans to outstanding commercial real estate loans	0.45		%	0.36		%	0.18		%	0.27		%	0.39		%
Nonaccruing loans to individuals to outstanding loans to individuals2	0.86		%	0.86		%	0.88		%	0.94		%	0.96		%

1     The Company adopted FASB Accounting Standards Update No. 2022-02, Financial Instruments - Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures, which eliminates designation of these loans as troubled debt restructurings effective January 1, 2023.

2    Excludes residential mortgages guaranteed by U.S. government agencies.

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Nonaccruing loans decreased $1.5 million compared to December 31, 2022. Nonaccruing services loans decreased $8.1 million, nonaccruing healthcare loans decreased $3.8 million and nonaccruing energy loans decreased $1.3 million. These decreases were partially offset by a $7.3 million increase in nonaccruing general business loans and a $5.1 million increase in nonaccruing commercial real estate loans. Newly identified nonaccruing loans totaled $25 million, offset by $22 million of payments and $3.7 million of charge-offs. The Company generally retains nonperforming assets to maximize potential recovery, which may cause future nonperforming assets to decrease more slowly.

A rollforward of nonperforming assets for the three months ended March 31, 2023 follows in Table 18.

Table 18 – Rollforward of Nonperforming Assets

(In thousands)

	Three Months Ended
	March 31, 2023
	Nonaccruing Loans								Renegotiated Loans		Real Estate and Other Repossessed Assets		Total Nonperforming Assets
	Commercial		Commercial Real Estate		Loan to Individuals		Total
Balance, December 31, 2022	$	60,297	$	16,570	$	44,930	$	121,797	$	163,535	$	14,304	$	299,636
Change in accounting standard	—		—		—		—		(163,535)		—		(163,535)
Additions	12,973		7,459		4,557		24,989		—		—		24,989
Payments	(18,826)		(153)		(2,607)		(21,586)		—		—		(21,586)
Charge-offs	(12)		(2,208)		(1,447)		(3,667)		—		—		(3,667)
Net gains (losses) and write-downs	—		—		—		—		—		1,051		1,051
Foreclosure of nonperforming loans	—		—		(225)		(225)		—		225		—
Foreclosure of loans guaranteed by U.S. government agencies	—		—		(1,013)		(1,013)		—		—		(1,013)
Proceeds from sales	—		—		—		—		—		(2,929)		(2,929)
Balance, March 31, 2023	$	54,432	$	21,668	$	44,195	$	120,295	$	—	$	12,651	$	132,946

We foreclose on loans guaranteed by U.S. government agencies in accordance with agency guidelines. Generally these loans are not eligible for modification programs or have failed to comply with modified loan terms. Principal is guaranteed by agencies of the U.S. government, subject to limitations and credit risk is limited. At foreclosure, these amounts are transferred to claims receivable accounts. These properties will be conveyed to the agencies once applicable criteria have been met. 

Real Estate and Other Repossessed Assets

Real estate and other repossessed assets totaled $13 million at March 31, 2023, composed primarily of $9.0 million of developed commercial real estate. Real estate and other repossessed assets decreased $1.7 million compared to December 31, 2022.

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Liquidity and Capital

Based on the average balances for the first quarter of 2023, approximately 73 percent of our funding was provided by deposit accounts, 14 percent from borrowed funds, less than 2 percent from long-term subordinated debt and 11 percent from equity. Our funding sources, which primarily include deposits and borrowings from the Federal Home Loan Banks and other banks, provide adequate liquidity to meet our operating needs.

Subsidiary Bank

Deposits and borrowed funds are the primary sources of liquidity for BOKF, NA, the wholly owned subsidiary bank of BOK Financial. We compete for retail and commercial deposits by offering a broad range of products and services and focusing on customer convenience. Retail deposit growth is supported through personal and small business checking, online bill paying services, mobile banking services, an extensive network of branch locations and ATMs and our ExpressBank call center. Commercial deposit growth is supported by offering treasury management and lockbox services. We also acquire brokered deposits when the cost of funds is advantageous to other funding sources.

Average deposits for the first quarter of 2023 totaled $33.5 billion, a $2.0 billion decrease compared to the fourth quarter of 2022. Deposit balances continue to decline as customers redeploy resources and pursue other investment alternatives following the savings trend during the height of the pandemic. Demand deposits decreased $1.8 billion while interest-bearing transaction account balances decreased $258 million. Certificate of deposit balances increased $60 million.

Table 19 – Average Deposits by Line of Business

(In thousands)

	Three Months Ended
	Mar. 31, 2023		Dec. 31, 2022		Sep. 30, 2022		June 30, 2022		Mar. 31, 2022
Commercial Banking	$	15,861,285	$	16,832,244	$	17,966,661	$	18,933,766	$	19,595,260
Consumer Banking	8,248,541		8,617,085		8,812,884		8,876,469		8,746,622
Wealth Management	7,432,413		7,888,753		7,999,074		8,482,785		9,619,323
Subtotal	31,542,239		33,338,082		34,778,619		36,293,020		37,961,205
Funds Management and other	1,940,232		2,123,303		2,271,157		2,301,400		2,401,002
Total	$	33,482,471	$	35,461,385	$	37,049,776	$	38,594,420	$	40,362,207

Average Commercial Banking deposit balances decreased $971 million compared to the fourth quarter of 2022. Demand deposit balances decreased $1.4 billion while interest-bearing transaction account balances increased $413 million. Commercial deposit balances have decreased as short-term rates move higher, enhancing Commercial customers' investment alternatives. Our commercial deposit portfolio is highly diversified across industries and customers. The highest concentration by industry within our commercial deposit portfolio is with our energy customers at 7 percent.

Average Consumer Banking deposit balances decreased $369 million compared to the prior quarter. Interest-bearing transaction deposit balances decreased $231 million and demand deposit balances decreased $111 million.

Average Wealth Management deposits decreased $456 million compared to the fourth quarter of 2022. Demand deposit balances decreased $273 million and interest-bearing transaction account balances decreased $214 million.

Average interest-bearing transaction accounts for the first quarter included $1.4 billion of brokered deposits, a $223 million decrease compared to the fourth quarter of 2022. Average time deposits for the first quarter of 2023 included $95 million of brokered deposits, a $49 million increase over the fourth quarter of 2022.

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The distribution of our period end deposit account balances among principal markets follows in Table 20.

Table 20 – Period End Deposits by Principal Market Area

(In thousands)

	Mar. 31, 2023		Dec. 31, 2022		Sep. 30, 2022		June 30, 2022		Mar. 31, 2022
Oklahoma:
Demand	$	4,369,944	$	4,585,963	$	5,143,405	$	5,422,593	$	5,205,806
Interest-bearing:
Transaction	9,468,100		9,475,528		9,619,419		10,240,378		11,410,709
Savings	564,829		555,407		558,256		561,413		558,634
Time	942,787		794,002		776,306		678,127		817,744
Total interest-bearing	10,975,716		10,824,937		10,953,981		11,479,918		12,787,087
Total Oklahoma	15,345,660		15,410,900		16,097,386		16,902,511		17,992,893
Texas:
Demand	3,154,789		3,873,759		4,609,255		4,670,535		4,552,001
Interest-bearing:
Transaction	4,366,932		4,878,482		4,781,920		5,344,326		4,963,118
Savings	175,012		178,356		179,049		183,708		182,536
Time	321,774		356,538		343,015		333,038		329,931
Total interest-bearing	4,863,718		5,413,376		5,303,984		5,861,072		5,475,585
Total Texas	8,018,507		9,287,135		9,913,239		10,531,607		10,027,586
Colorado:
Demand	1,869,194		2,462,891		2,510,179		2,799,798		2,673,352
Interest-bearing:
Transaction	2,126,435		2,123,218		2,221,796		2,277,563		2,387,304
Savings	72,548		77,961		80,542		82,976		81,762
Time	128,583		135,043		151,064		160,795		165,401
Total interest-bearing	2,327,566		2,336,222		2,453,402		2,521,334		2,634,467
Total Colorado	4,196,760		4,799,113		4,963,581		5,321,132		5,307,819
New Mexico:
Demand	997,364		1,141,958		1,296,410		1,347,600		1,271,264
Interest-bearing:
Transaction	674,328		691,915		717,492		845,442		888,257
Savings	111,771		112,430		113,056		115,660		115,457
Time	137,875		133,625		142,856		148,532		156,140
Total interest-bearing	923,974		937,970		973,404		1,109,634		1,159,854
Total New Mexico	1,921,338		2,079,928		2,269,814		2,457,234		2,431,118

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	Mar. 31, 2023		Dec. 31, 2022		Sep. 30, 2022		June 30, 2022		Mar. 31, 2022
Arizona:
Demand	780,051		844,327		903,296		901,543		947,775
Interest-bearing:
Transaction	687,527		739,628		788,142		792,269		810,896
Savings	16,993		16,496		18,258		17,999		18,122
Time	27,755		24,846		26,704		28,774		27,259
Total interest-bearing	732,275		780,970		833,104		839,042		856,277
Total Arizona	1,512,326		1,625,297		1,736,400		1,740,585		1,804,052
Kansas/Missouri:
Demand	393,321		436,259		479,459		537,143		553,345
Interest-bearing:
Transaction	1,040,009		694,163		747,981		913,921		1,107,525
Savings	18,292		20,678		19,375		19,943		19,589
Time	13,061		12,963		13,258		13,962		11,527
Total interest-bearing	1,071,362		727,804		780,614		947,826		1,138,641
Total Kansas/Missouri	1,464,683		1,164,063		1,260,073		1,484,969		1,691,986
Arkansas:
Demand	42,312		50,180		43,111		41,084		38,798
Interest-bearing:
Transaction	71,158		56,181		123,273		130,300		122,020
Savings	3,228		3,083		3,098		3,125		3,265
Time	4,775		4,825		5,940		6,371		6,414
Total interest-bearing	79,161		64,089		132,311		139,796		131,699
Total Arkansas	121,473		114,269		175,422		180,880		170,497
Total BOK Financial deposits	$	32,580,747	$	34,480,705	$	36,415,915	$	38,618,918	$	39,425,951

Estimated uninsured deposits totaled $18.7 billion or 57 percent of our total deposits at March 31, 2023. In addition to insured deposits, we also hold $4.5 billion of collateralized deposits. With that adjustment, our uninsured and uncollateralized deposit level is $14.2 billion or 44 percent of total deposits at March 31, 2023.

In addition to deposits, liquidity is provided primarily by federal funds purchased, securities repurchase agreements and Federal Home Loan Banks borrowings. Federal funds purchased consist primarily of unsecured, overnight funds acquired from other financial institutions. Funds are primarily purchased from bankers' banks and Federal Home Loan Banks from across the country. The largest source of wholesale federal funds purchased totaled $750 million at March 31, 2023. Securities repurchase agreements generally mature within 90 days and are secured by certain available for sale and trading securities. Federal Home Loan Banks borrowings are generally short-term and are secured by a blanket pledge of eligible collateral (generally unencumbered U.S. Treasury and agency mortgage-backed securities, 1-4 family residential mortgage loans, multifamily and other qualifying commercial real estate loans). Amounts borrowed from the Federal Home Loan Bank of Topeka averaged $4.5 billion during the quarter, compared to $2.5 billion in the fourth quarter of 2022.

At March 31, 2023, management estimates a total potential secured borrowing capacity of approximately $12.7 billion. This includes the use of programs available to U.S. banks from the Federal Home Loan Banks and Federal Reserve Banks.

A summary of other borrowings for BOK Financial on a consolidated basis follows in Table 21.

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Table 21 – Borrowed Funds

(Dollars in thousands)

			Three Months Ended March 31, 2023							Three Months Ended Dec. 31, 2022
	Mar. 31, 2023		Average Balance During the Quarter		Rate		Maximum Outstanding At Any Month End During the Quarter	Dec. 31, 2022		Average Balance During the Quarter		Rate		Maximum Outstanding At Any Month End During the Quarter
Funds purchased	1,087,553		847,336		4.23	%	1,711,580	99,843		151,514		2.02	%	103,141
Repurchase agreements	512,171		911,901		2.50	%	512,171	2,170,534		894,933		2.06	%	2,170,534
Other borrowings:
Federal Home Loan Banks advances	4,700,000		4,475,555		4.74	%	4,700,000	4,700,000		2,486,958		4.06	%	4,700,000
GNMA repurchase liability	11,868		11,371		4.24	%	12,414	10,608		9,217		4.52	%	11,011
Other	24,017		25,354		2.54	%	26,311	26,300		27,020		3.47	%	27,424
Total other borrowings	4,735,885		4,512,280		4.73	%		4,736,908		2,523,195		4.08	%
Subordinated debentures1	131,148		131,166		6.40	%	131,164	131,205		131,180		6.16	%	131,205
Total other borrowed funds and subordinated debentures	$	6,466,757	$	6,402,683	4.38	%		$	7,138,490	$	3,700,822	3.58	%

1 Parent Company only.

BOKF, NA also has a liability related to the repurchase of certain delinquent residential mortgage loans previously sold in GNMA mortgage pools. Interest is payable monthly at rates contractually due to investors if delinquent loans are not repurchased from the GNMA mortgage pools.

Parent Company

At March 31, 2023, cash and interest-bearing cash and cash equivalents held by the parent company totaled $165 million. The primary sources of liquidity for BOK Financial are cash on hand and dividends from BOKF, NA. Dividends from the bank are limited by various banking regulations to net profits, as defined, for the year plus retained profits for the two preceding years. Dividends are further restricted by minimum capital requirements. At March 31, 2023, based upon the most restrictive limitations as well as management's internal capital policy, BOKF, NA could declare up to $433 million of dividends. Dividend constraints may be alleviated through increases in retained earnings, capital issuances or changes in risk weighted assets. Future losses or increases in required regulatory capital at the bank could affect its ability to pay dividends to the parent company.

Our equity capital at March 31, 2023 was $4.9 billion, a $191 million increase compared to December 31, 2022. Net income less cash dividends paid increased equity $126 million during the first quarter of 2023. Changes in interest rates resulted in a $108 million increase in accumulated other comprehensive income compared to December 31, 2022. We also repurchased $44 million of common stock during the first quarter of 2023. Capital is managed to maximize long-term value to the shareholders. Factors considered in managing capital include projections of future earnings including expected benefits from lower federal income tax rates, asset growth and acquisition strategies, and regulatory and debt covenant requirements. Capital management may include subordinated debt or perpetual preferred stock issuance, share repurchase and stock and cash dividends.

On November 1, 2022, the board of directors authorized the Company to purchase up to five million common shares, subject to market conditions, securities law and other regulatory compliance limitations. As of March 31, 2023, the Company had repurchased 761,477 shares under this authorization. The Company repurchased 447,071 shares of common stock at an average price of $98.64 a share in the first quarter of 2023. We view share buybacks opportunistically, but within the context of maintaining our strong capital position.

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BOK Financial and BOKF, NA are subject to various capital requirements administered by federal agencies. Failure to meet minimum capital requirements can result in certain mandatory and possibly additional discretionary actions by regulators that could have a material impact on operations. These capital requirements include quantitative measures of assets, liabilities and off-balance sheet items. The capital standards are also subject to qualitative judgments by the regulators.

A summary of minimum capital requirements, including a capital conservation buffer follows in Table 22. A bank which falls below these levels, including the capital conservation buffer, would be subject to regulatory restrictions on capital distributions (including, but not limited to, dividends and share repurchases) and executive bonus payments.

In March 2020, in response to the impact on the financial markets by the COVID-19 pandemic, the banking agencies issued an interim final rule permitting banking organizations that implement the current expected credit loss ("CECL") model the option to delay for two years an estimate of the CECL methodology's effect on regulatory capital, followed by a three-year transition period. The estimate includes the implementation date adjustment as of January 1, 2020 plus an estimate of the impact of the change for a two year period following implementation of CECL. We elected to delay the regulatory capital impact of the transition in accordance with the interim final rule. Deferral of the impact of CECL added 6 basis points to the Company's Common equity Tier 1 capital at March 31, 2023.

The capital ratios for BOK Financial on a consolidated basis are presented in Table 22.

Table 22 – Capital Ratios

	Minimum Capital Requirement		Capital Conservation Buffer		Minimum Capital Requirement Including Capital Conservation Buffer		Mar. 31, 2023		Dec. 31, 2022		Mar. 31, 2022
Risk-based capital:
Common equity Tier 1	4.50	%	2.50	%	7.00	%	12.19	%	11.69	%	11.30	%
Tier 1 capital	6.00	%	2.50	%	8.50	%	12.20	%	11.71	%	11.31	%
Total capital	8.00	%	2.50	%	10.50	%	13.21	%	12.67	%	12.25	%
Tier 1 Leverage	4.00	%	N/A		4.00	%	9.94	%	9.91	%	8.47	%
Average total equity to average assets							10.53	%	10.22	%	10.18	%
Tangible common equity ratio							8.46	%	7.63	%	8.13	%

Capital resources of financial institutions are also regularly measured by the tangible common shareholders' equity ratio. Tangible common shareholders' equity is shareholders' equity as defined by generally accepted accounting principles in the United States of America (“GAAP”) less intangible assets and equity which does not benefit common shareholders. Equity that does not benefit common shareholders includes preferred equity. This non-GAAP measure is a valuable indicator of a financial institution's capital strength since it eliminates intangible assets from shareholders' equity and retains the effect of unrealized losses on securities and other components of accumulated other comprehensive income in shareholders' equity.

Table 23 provides a reconciliation of the non-GAAP measures with financial measures defined by GAAP.

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Table 23 – Non-GAAP Measure

(Dollars in thousands)

	Mar. 31, 2023			Dec. 31, 2022			Sep. 30, 2022			June 30, 2022			Mar. 31, 2022
Tangible common equity ratio:
Total shareholders' equity	$	4,874,786		$	4,682,649		$	4,509,934		$	4,737,339		$	4,849,582
Less: Goodwill and intangible assets, net	1,117,438			1,120,880			1,124,582			1,128,493			1,132,510
Tangible common equity	3,757,348			3,561,769			3,385,352			3,608,846			3,717,072
Add: Unrealized gain (loss) on investment securities, net	(140,947)			(167,477)			(165,206)			(30,305)			6,778
Add: Tax effect on unrealized gain (loss) on investment securities, net	33,149			39,196			38,665			7,093			(1,586)
Adjusted tangible common equity	$	3,649,550		$	3,433,488		$	3,258,811		$	3,585,634		$	3,722,264
Total assets	45,524,122			47,790,642			43,645,446			45,377,072			46,826,507
Less: Goodwill and intangible assets, net	1,117,438			1,120,880			1,124,582			1,128,493			1,132,510
Tangible assets	$	44,406,684		$	46,669,762		$	42,520,864		$	44,248,579		$	45,693,997
Tangible common equity ratio	8.46		%	7.63		%	7.96		%	8.16		%	8.13		%
Adjusted tangible common equity ratio	8.22		%	7.36		%	7.66		%	8.10		%	8.15		%
Pre-provision net revenue:
Net income before taxes	$	208,401		$	216,256		$	196,272		$	168,980		$	78,649
Provision for expected credit losses	16,000			15,000			15,000			—			—
Net income (loss) attributable to non-controlling interests	128			(37)			81			12			(36)
Pre-provision net revenue	$	224,273		$	231,293		$	211,191		$	168,968		$	78,685

Pre-provision net revenue is a measure of revenue less expenses, and is calculated before provision for credit losses and income tax expense. This financial measure is frequently used by investors and analysts to enable them to assess a company's ability to generate earnings to cover credit losses through a credit cycle. It also provides an additional basis for comparing the results of operations between periods by isolating the impact of the provision for credit losses, which can vary significantly between periods.

Off-Balance Sheet Arrangements

See Note 4 to the Consolidated Financial Statements for a discussion of the Company's significant off-balance sheet commitments.

Market Risk

Market risk is a broad term for the risk of economic loss due to adverse changes in the fair value of a financial instrument. These changes may be the result of various factors, including interest rates, foreign exchange rates, commodity prices or equity prices. Financial instruments that are subject to market risk can be classified either as held for trading or held for purposes other than trading. Market risk excludes changes in fair value due to the credit of the individual issuers of financial instruments.

BOK Financial is subject to market risk primarily through the effect of changes in interest rates on both its assets held for purposes other than trading and trading assets. The effects of other changes, such as foreign exchange rates, commodity prices or equity prices do not pose significant market risk to BOK Financial. BOK Financial has no material investments in assets that are affected by changes in foreign exchange rates or equity prices. Energy and agricultural product derivative contracts, which are affected by changes in commodity prices, are matched against offsetting contracts as previously discussed.

The Asset/Liability Committee is responsible for managing market risk in accordance with policy limits established by the Board of Directors. The Committee monitors projected variation in net interest revenue, net income and economic value of equity due to specified changes in interest rates. These limits also set maximum levels for short-term borrowings, short-term assets, public funds and brokered deposits and establish minimum levels for un-pledged assets, among other things. Further, the Board has approved market risk limits for fixed income trading, mortgage pipeline and mortgage servicing assets inclusive of economic hedge benefits. Exposure is measured daily and compliance is reviewed monthly. Deviations from the Board

- 34 -

approved limits, which periodically occur throughout the reporting period, may require management to develop and execute plans to reduce exposure. These plans are subject to escalation to and approval by the Board.

The simulations used to manage market risk are based on numerous assumptions regarding the effects of changes in interest rates on the timing and extent of repricing characteristics, future cash flows and customer behavior. These assumptions are inherently uncertain and, as a result, models cannot precisely estimate or precisely predict the impact of higher or lower interest rates. Actual results will differ from simulated results due to timing, magnitude and frequency of interest rate changes, market conditions and management strategies, among other factors.

Interest Rate Risk – Other than Trading

As previously noted in the Net Interest Revenue section of this report, management has implemented strategies to manage the Company's balance sheet exposure to changes in interest rates over a twelve-month period within established policy limits. The effectiveness of these strategies in managing the overall interest rate risk is evaluated through the use of an asset/liability model. BOK Financial performs a sensitivity analysis to identify more dynamic interest rate risk exposures, including embedded option positions, on net interest revenue. A simulation model is used to estimate the effect of changes in interest rates on our performance across multiple interest rate scenarios. Our current internal policy limit for net interest revenue variation due to a 200 basis point parallel change in market interest rates over twelve months is a maximum decline of 6.5 percent. Management also reviews alternative rate changes and time periods.

On March 5, 2021, the U.K. Financial Conduct Authority ("FCA") confirmed that the publication of the principal tenors of the U.S. dollar London Interbank Offered Rate ("LIBOR") will cease immediately following a final publication on June 30, 2023. Further, U.S. regulators released a joint inter-agency statement about their expectations that banks cease entering into new contracts that use USD LIBOR as a reference rate as soon as practicable and in any event by December 31, 2021.

The Company has ceased production of new LIBOR-based exposure as of December 31, 2021 and now offers floating rate products in various alternative reference rates with the majority of volume being observed thus far in simple or term rate versions of the Secured Overnight Financing Rate ("SOFR"). Key loan provisions have been modified so that new and renewed loans include LIBOR fallback language designed to ensure the smoothest possible transition from LIBOR to the new benchmark when such transition occurs. All existing financial contracts with direct exposure to LIBOR have been inventoried, and the Company has taken action to transition these exposures to an alternative reference rate in advance of the June 30, 2023 deadline.

The Company's primary interest rate exposures include the Federal Funds rate, which affects short-term borrowings, and the prime lending rate, LIBOR and SOFR, which are the basis for much of the variable rate loan pricing. Additionally, residential mortgage rates directly affect the prepayment speeds for residential mortgage-backed securities and mortgage servicing rights. Derivative financial instruments and other financial instruments used for purposes other than trading are included in this simulation. In addition, the impact on the level and composition of demand deposit accounts and other core deposit balances resulting from a significant increase in short-term market interest rates and the overall interest rate environment is likely to be material. The simulation incorporates assumptions regarding the effects of such changes based on a combination of historical analysis and expected behavior. The impact of planned growth and new business activities is factored into the simulation model.

The interest rate sensitivity in Table 24 indicates management's estimation of the impact of rate changes on net interest revenue. Should deposit costs be 10 percent more sensitive to changes in rates, the variation in net interest revenue over the next twelve months would be (3.01) percent, or ($42.0 million) for the 200 basis point increase scenario. Alternatively, should deposit funding costs be 10 percent less sensitive to changes in rates, the variation in net interest revenue over the next twelve months would be (0.84) percent, or ($11.8 million) for the 200 basis point increase scenario.

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Table 24 – Interest Rate Sensitivity

(Dollars in thousands)

	Mar. 31, 2023												Dec. 31, 2022
	200 bp Increase			100 bp Increase			100 bp Decrease			200 bp Decrease			200 bp Increase			100 bp Increase			100 bp Decrease			200 bp Decrease
Anticipated impact over the next twelve months on net interest revenue	$	(26,900)		$	(2,800)		$	(26,600)		$	(40,970)		$	(10,980)		$	8,440		$	(42,660)		$	(73,800)
	(1.93)		%	(0.20)		%	(1.90)		%	(2.93)		%	(0.71)		%	0.54		%	(2.75)		%	(4.76)		%
Anticipated impact over months twelve through twenty-four	$	(10,100)		$	21,970		$	(96,300)		$	(177,100)		$	4,090		$	40,190		$	(129,900)		$	(239,300)
	(0.68)		%	1.47		%	(6.46)		%	(11.88)		%	0.24		%	2.39		%	(7.71)		%	(14.21)		%

BOK Financial is also subjected to market risk through changes in the fair value of mortgage servicing rights. Changes in the fair value of mortgage servicing rights are highly dependent on changes in primary mortgage rates offered to borrowers, intermediate-term interest rates that affect the value of custodial funds, and assumptions about servicing revenues, servicing costs and discount rates. As primary mortgage rates increase, prepayment speeds slow and the value of our mortgage servicing rights increases. As primary mortgage rates fall, prepayment speeds increase and the value of our mortgage servicing rights decreases.

We maintain a portfolio of financial instruments which may include debt securities issued by the U.S. government or its agencies and interest rate derivative contracts, held as an economic hedge of the changes in the fair value of our mortgage servicing rights. Composition of this portfolio will change based on our assessment of market risk. Changes in the fair value of residential mortgage-backed securities are highly dependent on changes in secondary mortgage rates required by investors, and interest rate derivative contracts are highly dependent on changes in other market interest rates. While primary and secondary mortgage rates generally move in the same direction, the spread between them may widen and narrow due to market conditions and government intervention. Changes in the forward-looking spread between the primary and secondary rates can cause significant earnings volatility.

Management performs a stress test to measure market risk due to changes in interest rates inherent in its MSR portfolio and hedges. The stress test shocks applicable interest rates up and down 50 basis points and calculates an estimated change in fair value, net of economic hedging activity, that may result. The Board has approved a $20 million market risk limit for mortgage servicing rights, net of economic hedges.

Table 25 – MSR Asset and Hedge Sensitivity Analysis

(In thousands)

	Mar. 31, 2023				Dec. 31, 2022
	Up 50 bp		Down 50 bp		Up 50 bp		Down 50 bp
MSR Asset	$	8,778	$	(11,308)	$	6,100	$	(8,195)
MSR Hedge	(10,299)		9,860		(7,400)		6,810
Net Exposure	(1,521)		(1,448)		(1,300)		(1,385)

Trading Activities

The Company bears market risk by originating residential mortgages held for sale ("RMHFS"). RMHFS are generally outstanding for 60 to 90 days, which represents the typical period from commitment to originate a loan to sale of the closed loan to an investor. Primary mortgage interest rate changes during this period affect the value of RMHFS commitments and loans. We use forward sale contracts to mitigate market risk on all closed mortgage loans held for sale and on an estimate of mortgage loan commitments that are expected to result in closed loans.

A variety of methods are used to monitor market risk of mortgage origination activities. These methods include daily marking of all positions to market value, independent verification of inventory pricing, and revenue sensitivity limits.

- 36 -

Management performs a stress test to measure market risk due to changes in interest rates inherent in the mortgage production pipeline. The stress test shocks applicable interest rates up and down 50 basis points and calculates an estimated change in fair value, net of economic hedging activity that may result. The Board has approved a $7 million market risk limit for the mortgage production pipeline, net of forward sale contracts.

Table 26 – Mortgage Pipeline Sensitivity Analysis

(In thousands)

	Three Months Ended
	Mar. 31, 2023				Dec. 31, 2022				Mar. 31, 2022
	Up 50 bp		Down 50 bp		Up 50 bp		Down 50 bp		Up 50 bp		Down 50 bp
Average1	$	(79)	$	(16)	$	(71)	$	(50)	$	(96)	$	(420)
Low2	(1)		61		28		18		161		2
High3	(186)		(84)		(214)		(131)		(402)		(779)
Period End	(74)		(19)		(71)		(30)		(27)		(95)

1    Average represents the simple average of each daily value observed during the reporting period.

2    Low represents least risk of loss in fair value measured as the smallest negative value or the largest positive value observed daily during the reporting period.

3    High represents the greatest risk of loss in fair value measured as the largest negative value or the smallest positive value observed daily during the reporting period.

BOK Financial enters into trading activities both as an intermediary for customers and for its own account. As an intermediary, we take positions in securities, generally residential mortgage-backed securities, government agency securities and municipal bonds. These securities are purchased for resale to customers, which include individuals, corporations, foundations and financial institutions. On a limited basis, we may also take trading positions in U.S. Treasury securities, residential mortgage-backed securities, and municipal bonds to enhance returns on securities portfolios. Both of these activities involve interest rate risk, liquidity risk and price risk.

A variety of methods are used to monitor and manage the market risk of trading activities. These methods include daily marking of all positions to market value, independent verification of inventory pricing, and position limits for each trading activity. Risk management tools include Value at Risk ("VaR"), stress testing and sensitivity analysis. Economic hedges in either the futures or cash markets may be used to reduce the risk associated with some trading programs. Basis Risk can result when trading asset values and the instruments used to hedge them move at different rates.

VaR measures the potential loss of a given position or portfolio of positions at a specified confidence level and time horizon. BOK Financial utilizes a historical VaR methodology to measure and aggregate risks across its covered trading positions. For Market Risk Rule purposes, the Company calculates VaR using a historical simulation approach and measures the potential trading losses using a 10-day holding period and a 99% confidence level.

Due to inherent limitations of the VaR methodology, including its reliance on past market behavior, which might not be indicative of future market performance, VaR is only one of several tools used to measure and manage market risk. Other tools used to actively manage market risk include stress testing ("Stressed VaR"), and sensitivity analysis.

Stressed VaR is calculated using the same internal models as used for the VaR-based measure. Stressed VaR is calculated over a ten-day holding period at a one-tail, 99% confidence level and employs a historical simulation approach based on a continuous twelve-month historical window selected to reflect a period of significant financial stress for the Company's trading portfolio.

The trading portfolio's VaR and Stressed VaR profiles are influenced by a variety of factors, including the size and composition of the portfolio, market volatility, and the correlation between different positions. A portfolio of trading positions is typically less risky than the sum of the risk from each of the individual sub-portfolios because, under normal market conditions, risk within each category partially offsets the exposure to other risk categories. Table 27 below summarizes certain VaR and Stressed VaR based measures for the three months ended March 31, 2023, December 31, 2022, March 31, 2022 and Dec. 31, 2022. In the first quarter of 2023, both VaR measures decreased from the previous quarter. This decrease resulted from a decline in total trading assets and a decrease in basis risk between trading assets and their economic hedges.

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Table 27 – VaR and SVaR Measures

(In thousands)

	Three Months Ended
	Mar. 31, 2023				Dec. 31, 2022				Mar. 31, 2022
	10 day 99% VaR		10 day 99% SVaR		10 day 99% VaR		10 day 99% SVaR		10 day 99% VaR		10 day 99% SVaR
Average1	$	4,059	$	7,461	$	3,927	$	7,091	$	8,759	$	39,402
Low	1,944		3,156		933		3,210		5,969		23,910
High	8,487		15,571		9,077		15,396		14,556		73,790
Period End	4,036		8,907		8,000		13,819		8,178		23,988

1    Average represents the simple average of each daily value observed during the reporting period.

The Company monitors the accuracy of internal VaR models and modeling processes by back-testing model performance. The Company updates historical data used by the VaR model on a regular basis, and model validators independent of business lines perform regular modeled validations to access model input, processing, and reporting components. These models are required to be independently validated and approved prior to implementation.

Limit Structure

Beyond VaR and SVaR described above, Management also performs a sensitivity analysis to measure market risk from changes in interest rates on its trading portfolio. Applicable interest rates are shocked up and down 50 basis points, calculating an estimated change in fair value, net of economic hedging activity that may result. The Board has approved an $8 million market risk limit for the trading portfolio, net of economic hedges.

Table 28 – Trading Sensitivity Analysis

(In thousands)

	Three Months Ended
	Mar. 31, 2023				Dec. 31, 2022				Mar. 31, 2022
	Up 50 bp		Down 50 bp		Up 50 bp		Down 50 bp		Up 50 bp		Down 50 bp
Average1	$	701	$	(497)	$	1,456	$	(1,151)	$	499	$	2,927
Low2	4,513		1,983		4,508		1,766		8,643		12,277
High3	(1,837)		(4,538)		(1,523)		(4,472)		(11,253)		(3,813)
Period End	2,247		(2,053)		3,507		(3,458)		49		1,076

1    Average represents the simple average of each daily value observed during the reporting period.

2    Low represents least risk of loss in fair value measured as the smallest negative value or the largest positive value observed daily during the reporting period.

3    High represents the greatest risk of loss in fair value measured as the largest negative value or the smallest positive value observed daily during the reporting period.

Model Risk Governance and Review

BOK Financial has an internal but independent Model Risk Governance and Review ("MRGR") team that validates models to verify they are conceptually sound, computationally accurate, are performing as expected, and are in line with their intended use. MRGR also enforces the Company's model risk governance program that defines roles and responsibilities, including the authority to levy findings requiring remediation and to restrict model usage.

Model Validation

MRGR is independent of both the developers and users of the models. The team validates models through an evaluation process that assesses the data, theory, implementation, outcomes, and governance of each scenario. MRGR assigns each model a model risk score, which determines the frequency and scope of each validation. Validations comprise an assessment of model performance as well as a model's potential limitations given its particular assumptions or weaknesses. Based on the results of the review, the team determines the use case for the model. The ultimate validation results may require remediation actions from the business line. MRGR communicates their result as one of the following three outcomes: "Approved for use", "Approved with findings", or "Unapproved".

- 38 -

Controls and Procedures

As required by Rule 13a-15(b), BOK Financial's management, including the Chief Executive Officer and Chief Financial Officer, conducted an evaluation as of the end of the period covered by their reports, of the effectiveness of the Company's disclosure controls and procedures as defined in Exchange Act Rule 13a-15(e). Based on that evaluation, the Chief Executive Officer and Chief Financial Officer concluded that the disclosure controls and procedures were effective as of the end of the period covered by this report. As required by Rule 13a-15(d), BOK Financial's management, including the Chief Executive Officer and Chief Financial Officer, also conducted an evaluation of the Company's internal controls over financial reporting to determine whether any changes occurred during the quarter covered by this report that have materially affected, or are reasonably likely to materially affect, the Company's internal controls over financial reporting. Based on that evaluation, there has been no such change during the quarter covered by this report.

Forward-Looking Statements

This report contains forward-looking statements that are based on management's beliefs, assumptions, current expectations, estimates and projections about BOK Financial Corporation, the financial services industry, the economy generally and the expected or potential impact of the novel coronavirus (COVID-19) pandemic, and the related responses of the government, consumers, and others, on our business, financial condition and results of operations. Words such as "anticipates", "believes", "estimates", "expects", "forecasts", "plans", "projects", "will", "intends", variations of such words and similar expressions are intended to identify such forward-looking statements. Management judgments relating to and discussion of the provision and allowance for credit losses, allowance for uncertain tax positions, accruals for loss contingencies and valuation of mortgage servicing rights involve judgments as to expected events and are inherently forward-looking statements. Assessments that acquisitions and growth endeavors will be profitable are necessary statements of belief as to the outcome of future events based in part on information provided by others which BOK Financial has not independently verified. These various forward-looking statements are not guarantees of future performance and involve certain risks, uncertainties, and assumptions which are difficult to predict with regard to timing, extent, likelihood and degree of occurrence. Therefore, actual results and outcomes may materially differ from what is expected, implied or forecasted in such forward-looking statements. Internal and external factors that might cause such a difference include, but are not limited to changes in government, consumer or business responses to, and ability to treat or prevent further outbreak of, the COVID-19 pandemic, changes in commodity prices, interest rates and interest rate relationships, inflation, demand for products and services, the degree of competition by traditional and nontraditional competitors, changes in banking regulations, tax laws, prices, levies and assessments, the impact of technological advances, and trends in customer behavior as well as their ability to repay loans. BOK Financial and its affiliates undertake no obligation to update, amend or clarify forward-looking statements, whether as a result of new information, future events, or otherwise.

Annualized, pro forma, projected and estimated numbers are used for illustrative purpose only, are not forecasts and may not reflect actual results.

In this report we may sometimes use non-GAAP financial measures. Please note that although non-GAAP financial measures provide useful insight to analysts, investors and regulators, they should not be considered in isolation or relied upon as a substitute for analysis using GAAP measures. If applicable, we provide GAAP reconciliations for non-GAAP financial measures.

- 39 -

Consolidated Statements of Earnings (Unaudited)
(In thousands, except share and per share data)	Three Months Ended
	March 31,
Interest revenue	2023		2022
Loans	$	367,870	$	178,373
Residential mortgage loans held for sale	979		1,394
Trading securities	34,009		40,975
Investment securities	8,928		2,354
Available for sale securities	88,736		57,932
Fair value option securities	3,893		491
Restricted equity securities	5,808		1,107
Interest-bearing cash and cash equivalents	6,506		473
Total interest revenue	516,729		283,099
Interest expense
Deposits	95,274		7,598
Borrowed funds	67,038		5,788
Subordinated debentures	2,069		1,302
Total interest expense	164,381		14,688
Net interest revenue	352,348		268,411
Provision for credit losses	16,000		—
Net interest revenue after provision for credit losses	336,348		268,411
Other operating revenue
Brokerage and trading revenue	52,396		(27,079)
Transaction card revenue	25,621		24,216
Fiduciary and asset management revenue	50,657		46,399
Deposit service charges and fees	25,968		27,004
Mortgage banking revenue	14,367		16,650
Other revenue	16,970		10,445
Total fees and commissions	185,979		97,635
Other gains (losses), net	2,251		(1,644)
Loss on derivatives, net	(1,344)		(46,981)
Loss on fair value option securities, net	(2,962)		(11,201)
Change in fair value of mortgage servicing rights	(6,059)		49,110
Gain on available for sale securities, net	—		937
Total other operating revenue	177,865		87,856
Other operating expense
Personnel	182,145		159,228
Business promotion	8,569		6,513
Professional fees and services	13,048		11,413
Net occupancy and equipment	28,459		30,855
Insurance	7,315		4,283
Data processing and communications	44,802		39,836
Printing, postage and supplies	3,893		3,689
Amortization of intangible assets	3,391		3,964
Mortgage banking costs	5,782		7,877
Other expense	8,408		9,960
Total other operating expense	305,812		277,618
Net income before taxes	208,401		78,649
Federal and state income taxes	45,905		16,197
Net income	162,496		62,452
Net income (loss) attributable to non-controlling interests	128		(36)
Net income attributable to BOK Financial Corporation shareholders	$	162,368	$	62,488
Earnings per share:
Basic	$	2.43	$	0.91
Diluted	$	2.43	$	0.91
Average shares used in computation:
Basic	66,331,775		67,812,400
Diluted	66,331,775		67,813,851
Dividends declared per share	$	0.54	$	0.53

See accompanying notes to consolidated financial statements.

- 40 -

Consolidated Statements of Comprehensive Income (Unaudited)
(In thousands, except share and per share data)
	Three Months Ended
	March 31,
	2023		2022
Net income	$	162,496	$	62,452
Other comprehensive income (loss) before income taxes:
Net change in unrealized gain (loss)	124,045		(639,041)
Reclassification adjustments included in earnings:
Interest revenue, Investment securities	16,051		—
Gain on available for sale securities, net	—		(937)
Other comprehensive income (loss) before income taxes	140,096		(639,978)
Federal and state income taxes	31,695		(149,781)
Other comprehensive income (loss), net of income taxes	108,401		(490,197)
Comprehensive income (loss)	270,897		(427,745)
Comprehensive income (loss) attributable to non-controlling interests	128		(36)
Comprehensive income (loss) attributable to BOK Financial Corp. shareholders	$	270,769	$	(427,709)

See accompanying notes to consolidated financial statements.

- 41 -

Consolidated Balance Sheets

(In thousands, except share data)

	Mar. 31, 2023		Dec. 31, 2022
	(Unaudited)		(Footnote 1)
Assets
Cash and due from banks	$	792,371	$	943,810
Interest-bearing cash and cash equivalents	571,613		457,906
Trading securities	2,294,358		4,464,161
Investment securities, net of allowance (fair value: March 31, 2023 – $2,307,686; December 31, 2022 – $2,346,768)	2,448,136		2,513,687
Available for sale securities	11,937,841		11,493,860
Fair value option securities	326,390		296,590
Restricted equity securities	288,181		299,651
Residential mortgage loans held for sale	74,175		75,272
Loans	22,750,053		22,557,150
Allowance for loan losses	(249,460)		(235,704)
Loans, net of allowance	22,500,593		22,321,446
Premises and equipment, net	623,112		565,175
Receivables	265,680		273,815
Goodwill	1,044,749		1,044,749
Intangible assets, net	72,689		76,131
Mortgage servicing rights	299,803		277,608
Real estate and other repossessed assets, net of allowance (March 31, 2023 – $4,406; December 31, 2022 – $10,115)	12,651		14,304
Derivative contracts, net	394,291		880,343
Cash surrender value of bank-owned life insurance	408,614		406,751
Receivable on unsettled securities sales	18,186		31,004
Other assets	1,150,689		1,354,379
Total assets	$	45,524,122	$	47,790,642
Liabilities and Equity
Liabilities:
Noninterest-bearing demand deposits	$	11,606,975	$	13,395,337
Interest-bearing deposits:
Transaction	18,434,489		18,659,115
Savings	962,673		964,411
Time	1,576,610		1,461,842
Total deposits	32,580,747		34,480,705
Funds purchased and repurchase agreements	1,599,724		2,270,377
Other borrowings	4,735,885		4,736,908
Subordinated debentures	131,148		131,205
Accrued interest, taxes and expense	268,449		296,870
Derivative contracts, net	510,483		554,900
Due on unsettled securities purchases	262,492		147,470
Other liabilities	557,167		484,849
Total liabilities	40,646,095		43,103,284
Shareholders' equity:
Common stock ($0.00006 par value; 2,500,000,000 shares authorized; shares issued and outstanding: March 31, 2023 – 76,555,507; December 31, 2022 – 76,423,345)	5		5
Capital surplus	1,397,096		1,390,395
Retained earnings	4,950,176		4,824,164
Treasury stock (shares at cost: March 31, 2023 – 9,954,674; December 31, 2022 – 9,464,711)	(743,937)		(694,960)
Accumulated other comprehensive income (loss)	(728,554)		(836,955)
Total shareholders' equity	4,874,786		4,682,649
Non-controlling interests	3,241		4,709
Total equity	4,878,027		4,687,358
Total liabilities and equity	$	45,524,122	$	47,790,642

See accompanying notes to consolidated financial statements.

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Consolidated Statements of Changes in Equity (Unaudited)

(In thousands)

	Common Stock			Capital Surplus		Retained Earnings		Treasury Stock			Accumulated Other Comprehensive Income (Loss)		Total Shareholders' Equity		Non- Controlling Interests		Total Equity
	Shares	Amount						Shares	Amount
Balance, December 31, 2022	76,423	$	5	$	1,390,395	$	4,824,164	9,465	$	(694,960)	$	(836,955)	$	4,682,649	$	4,709	$	4,687,358
Net income (loss)	—	—		—		162,368		—	—		—		162,368		128		162,496
Other comprehensive income	—	—		—		—		—	—		108,401		108,401		—		108,401
Repurchase of common stock	—	—		—		—		447	(44,476)		—		(44,476)		—		(44,476)
Share-based compensation plans:
Stock options exercised	—	—		—		—		—	—		—		—		—		—
Non-vested shares awarded,      net	133	—		—		—		—	—		—		—		—		—
Vesting of non-vested      shares	—	—		—		—		43	(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, March 31, 2023	76,556	$	5	$	1,397,096	$	4,950,176	9,955	$	(743,937)	$	(728,554)	$	4,874,786	$	3,241	$	4,878,027
Balance, December 31, 2021	76,254	$	5	$	1,378,794	$	4,447,691	7,786	$	(535,129)	$	72,371	$	5,363,732	$	4,639	$	5,368,371
Net income (loss)	—	—		—		62,488		—	—		—		62,488		(36)		62,452
Other comprehensive loss	—	—		—		—		—	—		(490,197)		(490,197)		—		(490,197)
Repurchase of common stock	—	—		—		—		476	(48,074)		—		(48,074)		—		(48,074)
Share-based compensation      plans:
Stock options exercised	1	—		37		—		—	—		—		37		—		37
Non-vested shares awarded,      net	157	—		—		—		—	—		—		—		—		—
Vesting of non-vested      shares	—	—		—		—		46	(4,944)		—		(4,944)		—		(4,944)
Share-based compensation	—	—		2,835		—		—	—		—		2,835		—		2,835
Cash dividends on common      stock	—	—		—		(36,295)		—	—		—		(36,295)		—		(36,295)
Capital calls and distributions,      net	—	—		—		—		—	—		—		—		(661)		(661)
Balance, March 31, 2022	76,412	$	5	$	1,381,666	$	4,473,884	8,308	$	(588,147)	$	(417,826)	$	4,849,582	$	3,942	$	4,853,524

See accompanying notes to consolidated financial statements.

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Consolidated Statements of Cash Flows (Unaudited)

(In thousands)

	Three Months Ended
	March 31,
	2023		2022
Cash Flows From Operating Activities:
Net income	$	162,496	$	62,452
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Provision for credit losses	16,000		—
Change in fair value of mortgage servicing rights due to market assumption changes	6,059		(49,110)
Change in the fair value of mortgage servicing rights due to principal payments	5,382		7,960
Net unrealized (gains) losses from derivative contracts	61,704		(31,298)
Share-based compensation	6,701		2,835
Depreciation and amortization	26,885		26,091
Net amortization of discounts and premiums	(4,163)		3,216
Net losses (gains) on financial instruments and other losses (gains), net	(2,009)		706
Net loss (gain) on mortgage loans held for sale	1,361		(1,056)
Mortgage loans originated for sale	(138,624)		(418,866)
Proceeds from sale of mortgage loans held for sale	139,088		446,742
Capitalized mortgage servicing rights	(2,498)		(5,215)
Change in trading and fair value option securities	2,140,101		4,104,453
Change in receivables	11,032		(88,559)
Change in other assets	6,721		(19,589)
Change in other liabilities	28,544		(107,508)
Net cash provided by (used in) operating activities	2,464,780		3,933,254
Cash Flows From Investing Activities:
Proceeds from maturities or redemptions of investment securities	64,514		26,363
Proceeds from maturities or redemptions of available for sale securities	313,935		723,730
Purchases of available for sale securities	(631,168)		(1,161,606)
Proceeds from sales of available for sale securities	—		55,185
Change in amount receivable on unsettled available for sale securities transactions	9,864		(99,944)
Loans originated, net of principal collected	(187,088)		(460,128)
Net payments on derivative asset contracts	156,522		34,855
Net change in restricted equity securities	11,470		5,724
Proceeds from disposition of assets	7,401		9,708
Purchases of assets	(58,710)		(37,569)
Net cash provided by (used in) investing activities	(313,260)		(903,682)
Cash Flows From Financing Activities:
Net change in demand deposits, transaction deposits and savings accounts	(2,014,726)		(1,626,196)
Net change in time deposits	114,768		(189,912)
Net change in other borrowed funds	(677,232)		(1,271,195)
Net proceeds on derivative liability contracts	(158,021)		(30,779)
Net change in derivative margin accounts	579,188		(1,274,645)
Change in amount due on unsettled available for sale securities transactions	52,104		(17,198)
Issuance of common and treasury stock, net	(4,501)		(4,907)
Repurchase of common stock	(44,476)		(48,074)
Dividends paid	(36,356)		(36,295)
Net cash provided by (used in) financing activities	(2,189,252)		(4,499,201)
Net increase (decrease) in cash and cash equivalents	(37,732)		(1,469,629)
Cash and cash equivalents at beginning of period	1,401,716		2,837,410
Cash and cash equivalents at end of period	$	1,363,984	$	1,367,781
Supplemental Cash Flow Information:
Cash paid for interest	$	163,960	$	13,982
Cash paid for taxes	$	733	$	858
Net loans and bank premises transferred to repossessed real estate and other assets	$	225	$	64
Residential mortgage loans guaranteed by U.S. government agencies that became eligible for repurchase during the period	$	5,556	$	12,568
Conveyance of other real estate owned guaranteed by U.S. government agencies	$	1,150	$	1,812
Right-of-use assets obtained in exchange for operating lease liabilities	$	63,521	$	9,241

See accompanying notes to consolidated financial statements.

- 44 -

Notes to Consolidated Financial Statements (Unaudited)

(1) Significant Accounting Policies

Basis of Presentation

The accompanying unaudited consolidated financial statements of BOK Financial Corporation ("BOK Financial" or "the Company") 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 ("the Bank"), 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 2022 Form 10-K filed with the Securities and Exchange Commission, which contains audited financial statements. Amounts presented as of December 31, 2022 have been derived from the audited financial statements included in BOK Financial's 2022 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, 2023 are not necessarily indicative of the results that may be expected for the year ending December 31, 2023.

Newly Adopted and Pending Accounting Policies

Financial Accounting Standards Board ("FASB")

FASB Accounting Standards Update No. 2022-02, Financial Instruments - Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures ("ASU 2022-02")

On March 31, 2022, the FASB issued ASU 2022-02 which eliminates the accounting guidance on troubled debt restructurings ("TDRs") for creditors in ASC 310-40, while also no longer requiring an entity to consider renewals, modifications, and extensions that result from reasonably expected TDRs in their calculation of the allowance for credit losses. For receivables for which there has been a modification in their contractual cash flows, ASU 2022-02 requires disclosure, by class of financing receivable, of the types of modifications, the financial effects of those modifications, and the performance of these modified receivables, along with receivables that had a payment default during the current period and had modifications to the contractual cash flows within 12 months prior to the default. Further, ASU 2022-02 requires entities to disclose gross write-offs recorded in the current period by year of origination in the vintage disclosures on a year-to-date basis. ASU 2022-02 was effective for the Company January 1, 2023. Amendments related to TDR recognition and measurement and vintage disclosures were applied prospectively and are included in Note 4 to the consolidated financial statements. Adoption of this standard did not have a material effect on the Company's financial condition or results of operations.

FASB Accounting Standards Update No. 2023-01, Leases (Topic 842): Common Control Arrangements ("ASU 2023-01")

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 is not expected to have a material impact on the Company's financial statements.

- 45 -

FASB Accounting Standards Update No. 2023-02, Investments - Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Tax Credit Structures Using the Proportional Amortization Method ("ASU 2023-02")

On March 29, 2023, the FASB issued ASU 2023-02 which amends previous guidance to allow entities to account for qualifying tax equity investments using the proportional amortization method regardless of the program giving rise to the related income tax credits, as opposed to only being allowed to apply this method to qualifying tax equity investments in low-income housing tax credit structures as was the case under previous guidance. ASU 2023-02 is effective for fiscal years beginning after December 15, 2023, including interim periods within those fiscal years. Adoption of ASU 2023-02 is not expected to have a material impact on the Company's financial statements.

(2) Securities

Trading Securities

The fair value and net unrealized gain (loss) included in trading securities are as follows (in thousands):

	March 31, 2023				December 31, 2022
	Fair Value		Net Unrealized Gain (Loss)		Fair Value		Net Unrealized Gain (Loss)
U.S. government securities	$	5,618	$	(6)	$	9,823	$	(16)
Residential agency mortgage-backed securities	2,210,721		12,289		4,406,848		4
Municipal securities	37,455		45		21,484		(136)
Asset-backed securities	10,194		10		—		—
Other trading securities	30,370		228		26,006		(175)
Total trading securities	$	2,294,358	$	12,566	$	4,464,161	$	(323)

Investment Securities

The amortized cost and fair values of investment securities are as follows (in thousands):

	March 31, 2023
	Amortized		Carrying		Fair		Gross Unrealized
	Cost		Value1		Value		Gain		Loss
Municipal securities	$	153,739	$	153,739	$	160,866	$	7,321	$	(194)
Mortgage-backed securities:
Residential agency	2,472,291		2,264,922		2,118,538		163		(146,547)
Commercial agency	17,259		15,684		14,861		—		(823)
Other debt securities	14,288		14,288		13,421		—		(867)
Total investment securities	2,657,577		2,448,633		2,307,686		7,484		(148,431)
Allowance for credit losses	(497)		(497)		—		—		—
Investment securities, net of allowance	$	2,657,080	$	2,448,136	$	2,307,686	$	7,484	$	(148,431)

1    Carrying value includes $209 million of net unrealized loss which remains in Accumulated other comprehensive income ("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 as discussed in greater detail following.

- 46 -

	December 31, 2022
	Amortized		Carrying		Fair		Gross Unrealized
	Cost		Value1		Value		Gain		Loss
Municipal securities	$	170,629	$	170,629	$	176,621	$	6,456	$	(464)
Mortgage-backed securities:
Residential agency	2,538,565		2,315,219		2,143,360		155		(172,014)
Commercial agency	17,259		15,609		14,588		—		(1,021)
Other debt securities	12,788		12,788		12,199		—		(589)
Total investment securities	2,739,241		2,514,245		2,346,768		6,611		(174,088)
Allowance for credit losses	(558)		(558)		—		—		—
Investment securities, net of allowance	$	2,738,683	$	2,513,687	$	2,346,768	$	6,611	$	(174,088)

1    Carrying value includes $225 million of net unrealized loss which remains in Accumulated other comprehensive income ("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 as discussed in greater detail following.

The amortized cost and fair values of investment securities at March 31, 2023, by contractual maturity, are as shown in the following table (dollars in thousands):

	Less than One Year		One to Five Years		Six to Ten Years		Over Ten Years		Total		Weighted Average Maturity1
Fixed maturity debt securities:
Carrying value	$	24,634	$	92,723	$	66,341	$	13	$	183,711	3.94
Fair value	24,917		99,241		64,977		13		189,148
Residential mortgage-backed securities:
Carrying value									$	2,264,922	2
Fair value									2,118,538
Total investment securities:
Carrying value									$	2,448,633
Fair value									2,307,686

1Expected maturities may differ from contractual maturities, because borrowers may have the right to call or prepay obligations with or without penalty.

2The average expected lives of residential mortgage-backed securities were 5.3 years years based upon current prepayment assumptions.

Temporarily Impaired Investment Securities

(dollars in thousands):

	March 31, 2023
	Number of Securities	Less Than 12 Months				12 Months or Longer				Total
		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
Investment:
Municipal securities	9	$	—	$	—	$	6,594	$	194	$	6,594	$	194
Mortgage-backed securities:
Residential agency	116	2,115,733		146,464		1,599		83		2,117,332		146,547
Commercial agency	2	14,861		823		—		—		14,861		823
Other debt securities	3	9,153		847		255		20		9,408		867
Total investment securities	130	$	2,139,747	$	148,134	$	8,448	$	297	$	2,148,195	$	148,431

- 47 -

	December 31, 2022
	Number of Securities	Less Than 12 Months				12 Months or Longer				Total
		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
Investment:
Municipal securities	22	$	18,037	$	406	$	544	$	58	$	18,581	$	464
Mortgage-backed securities:
Residential agency	116	2,142,114		172,014		—		—		2,142,114		172,014
Commercial agency	2	14,588		1,021		—		—		14,588		1,021
Other debt securities	3	9,428		571		257		18		9,685		589
Total investment securities	143	$	2,184,167	$	174,012	$	801	$	76	$	2,184,968	$	174,088

Available for Sale Securities 

The amortized cost and fair value of available for sale securities are as follows (in thousands):

	March 31, 2023
	Amortized		Fair		Gross Unrealized
	Cost		Value		Gain		Loss
U.S. Treasury	$	1,000	$	914	$	—	$	(86)
Municipal securities	685,963		634,207		1,338		(53,094)
Mortgage-backed securities:
Residential agency	6,311,728		6,022,708		15,379		(304,399)
Residential non-agency	690,345		651,351		11,271		(50,265)
Commercial agency	4,989,813		4,628,188		5,738		(367,363)
Other debt securities	500		473		—		(27)
Total available for sale securities	$	12,679,349	$	11,937,841	$	33,726	$	(775,234)

	December 31, 2022
	Amortized		Fair		Gross Unrealized
	Cost		Value		Gain		Loss
U.S. Treasury	$	1,000	$	898	$	—	$	(102)
Municipal securities	687,875		624,500		321		(63,696)
Mortgage-backed securities:
Residential agency	6,161,358		5,814,496		13,085		(359,947)
Residential non-agency	616,423		577,576		11,776		(50,623)
Commercial agency	4,892,257		4,475,917		3,479		(419,819)
Other debt securities	500		473		—		(27)
Total available for sale securities	$	12,359,413	$	11,493,860	$	28,661	$	(894,214)

- 48 -

The amortized cost and fair values of available for sale securities at March 31, 2023, by contractual maturity, are as shown in the following table (dollars in thousands):

	Less than One Year		One to Five Years		Six to Ten Years		Over Ten Years		Total		Weighted Average Maturity1
Fixed maturity debt securities:
Amortized cost	$	148,742	$	2,665,838	$	2,360,090	$	502,606	$	5,677,276	5.82
Fair value	146,996		2,510,112		2,131,783		474,891		5,263,782
Residential mortgage-backed securities:
Amortized cost									$	7,002,073	2
Fair value									6,674,059
Total available for sale securities:
Amortized cost									$	12,679,349
Fair value									11,937,841

1Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without penalty.

2The average expected lives of residential mortgage-backed securities were 4.4 years years based upon current prepayment assumptions.

Sales of available for sale securities resulted in gains and losses as follows (in thousands):

	Three Months Ended March 31,
	2023		2022
Proceeds	$	—	$	55,185
Gross realized gains	—		1,933
Gross realized losses	—		(996)
Related federal and state income tax expense	—		219

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 $9.9 billion at March 31, 2023 and $11.2 billion at December 31, 2022. 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, 2023
	Number of Securities	Less Than 12 Months				12 Months or Longer				Total
		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
Available for sale:
U.S. Treasury	1	$	—	$	—	$	914	$	86	$	914	$	86
Municipal securities	215	61,983		767		487,032		52,327		549,015		53,094
Mortgage-backed securities:
Residential agency	618	1,531,016		37,020		3,240,193		267,379		4,771,209		304,399
Residential non-agency	30	230,541		8,648		343,580		41,617		574,121		50,265
Commercial agency	288	824,751		14,313		3,413,042		353,050		4,237,793		367,363
Other debt securities	1	—		—		473		27		473		27
Total available for sale securities	1,153	$	2,648,291	$	60,748	$	7,485,234	$	714,486	$	10,133,525	$	775,234

- 49 -

	December 31, 2022
	Number of Securities	Less Than 12 Months				12 Months or Longer				Total
		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
Available for sale:
U.S. Treasury	1	$	—	$	—	$	899	$	102	$	899	$	102
Municipal securities	227	146,634		5,301		428,248		58,395		574,882		63,696
Mortgage-backed securities:
Residential agency	613	3,879,582		256,973		863,732		102,974		4,743,314		359,947
Residential non-agency	26	499,716		50,623		—		—		499,716		50,623
Commercial agency	285	1,647,778		63,701		2,535,816		356,118		4,183,594		419,819
Other debt securities	1	—		—		473		27		473		27
Total available for sale securities	1,153	$	6,173,710	$	376,598	$	3,829,168	$	517,616	$	10,002,878	$	894,214

Based on evaluations of impaired securities as of March 31, 2023, 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, 2023				December 31, 2022
	Fair Value		Net Unrealized Gain (Loss)		Fair Value		Net Unrealized Gain (Loss)
U.S. Treasury	$	106,307	$	359	$	—	$	—
Residential agency mortgage-backed securities	220,083		250		296,590		338
Total	$	326,390	$	609	$	296,590	$	338

(3) 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.

- 50 -

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.

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.

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The following table summarizes the fair values of derivative contracts recorded as "derivative contracts" assets and liabilities in the balance sheet at March 31, 2023 (in thousands):

	Assets
	Notional1		Gross Fair Value		Netting Adjustments		Net Fair Value Before Cash Collateral		Cash Collateral		Fair Value Net of Cash Collateral
Customer risk management programs:
Interest rate contracts	$	2,691,550	$	121,481	$	(3,303)	$	118,178	$	(98,143)	$	20,035
Energy contracts	7,456,604		988,149		(592,276)		395,873		(121,612)		274,261
Foreign exchange contracts	59,321		57,431		—		57,431		(1,560)		55,871
Equity option contracts	12,286		116		—		116		(95)		21
Total customer risk management programs	10,219,761		1,167,177		(595,579)		571,598		(221,410)		350,188
Trading	14,507,221		87,395		(45,420)		41,975		(1,439)		40,536
Internal risk management programs	165,207		5,253		(1,686)		3,567		—		3,567
Total derivative contracts	$	24,892,189	$	1,259,825	$	(642,685)	$	617,140	$	(222,849)	$	394,291
	Liabilities
	Notional1		Gross Fair Value		Netting Adjustments		Net Fair Value Before Cash Collateral		Cash Collateral		Fair Value Net of Cash Collateral
Customer risk management programs:
Interest rate contracts	$	2,691,550	$	121,040	$	(3,303)	$	117,737	$	—	$	117,737
Energy contracts	7,564,737		997,077		(592,276)		404,801		(80,146)		324,655
Foreign exchange contracts	57,909		55,828		—		55,828		—		55,828
Equity option contracts	12,286		116		—		116		—		116
Total customer risk management programs	10,326,482		1,174,061		(595,579)		578,482		(80,146)		498,336
Trading	16,042,176		116,109		(45,420)		70,689		(59,941)		10,748
Internal risk management programs	135,415		3,085		(1,686)		1,399		—		1,399
Total derivative contracts	$	26,504,073	$	1,293,255	$	(642,685)	$	650,570	$	(140,087)	$	510,483

1    Notional amounts for commodity contracts are converted into dollar-equivalent amounts based on dollar prices at the inception of the contract.

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The following table summarizes the fair values of derivative contracts recorded as "derivative contracts" assets and liabilities in the balance sheet at December 31, 2022 (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	$	2,629,318	$	158,825	$	—	$	158,825	$	(114,955)	$	43,870
Energy contracts	7,918,020		1,232,283		(594,543)		637,740		(67,024)		570,716
Foreign exchange contracts	219,791		216,569		—		216,569		—		216,569
Equity option contracts	21,102		193		—		193		(109)		84
Total customer risk management programs	10,788,231		1,607,870		(594,543)		1,013,327		(182,088)		831,239
Trading	17,400,037		126,910		(74,647)		52,263		(4,646)		47,617
Internal risk management programs	85,000		1,500		(13)		1,487		—		1,487
Total derivative contracts	$	28,273,268	$	1,736,280	$	(669,203)	$	1,067,077	$	(186,734)	$	880,343
	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	$	2,629,122	$	158,816	$	—	$	158,816	$	—	$	158,816
Energy contracts	8,696,060		1,242,058		(594,543)		647,515		(484,319)		163,196
Foreign exchange contracts	214,855		211,233		—		211,233		(7)		211,226
Equity option contracts	21,102		193		—		193		—		193
Total customer risk management programs	11,561,139		1,612,300		(594,543)		1,017,757		(484,326)		533,431
Trading	14,038,906		94,958		(74,647)		20,311		(423)		19,888
Internal risk management programs	178,806		1,594		(13)		1,581		—		1,581
Total derivative contracts	$	25,778,851	$	1,708,852	$	(669,203)	$	1,039,649	$	(484,749)	$	554,900

1    Notional amounts for commodity contracts are converted into dollar-equivalent amounts based on dollar prices at the inception of the contract.

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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, 2023				March 31, 2022
	Brokerage and Trading Revenue		Gain (Loss) on Derivatives, Net		Brokerage and Trading Revenue		Gain (Loss) on Derivatives, Net
Customer risk management programs:
Interest rate contracts	$	1,770	$	—	$	6,342	$	—
Energy contracts	6,553		—		4,449		—
Foreign exchange contracts	31		—		148		—
Equity option contracts	—		—		—		—
Total customer risk management programs	8,354		—		10,939		—
Trading1	(63,093)		—		31,074		—
Internal risk management programs	—		(1,344)		—		(46,981)
Total derivative contracts	$	(54,739)	$	(1,344)	$	42,013	$	(46,981)

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.

(4) 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 is 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.

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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, 2023								December 31, 2022
	Fixed Rate		Variable Rate		Non-accrual		Total		Fixed Rate		Variable Rate		Non-accrual		Total
Commercial	$	3,427,345	$	10,735,572	$	54,432	$	14,217,349	$	3,392,422	$	10,759,780	$	60,297	$	14,212,499
Commercial real estate	879,806		3,913,842		21,668		4,815,316		874,716		3,715,491		16,570		4,606,777
Loans to individuals	2,125,020		1,548,173		44,195		3,717,388		2,099,165		1,593,779		44,930		3,737,874
Total	$	6,432,171	$	16,197,587	$	120,295	$	22,750,053	$	6,366,303	$	16,069,050	$	121,797	$	22,557,150

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, 2023, outstanding commitments totaled $15.1 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.

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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, 2023, outstanding standby letters of credit totaled $790 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 on-going evaluation of the estimated expected credit losses in the portfolio and on unused commitments to provide financing. A well-documented methodology has been developed and is applied by an independent Credit Administration department to assure consistency across the Company.

The allowance for loan losses consists of specific allowances attributed to certain individual loans, generally nonaccruing loans, with dissimilar risk characteristics that have not yet been charged down to amounts we expect to recover and general allowances for estimated credit losses on pools of loans that share similar risk characteristics.

When full collection of principal or interest is uncertain, the loan's risk characteristics have changed, and we exclude the loan from the general allowance pool, typically designating it as nonaccruing. For these loans, a specific allowance reflects the expected credit loss.

We measure specific allowances for loans excluded from the general allowance pool by an evaluation of estimated future cash flows discounted at the loan's initial effective interest rate or the fair value of collateral for certain collateral dependent loans. For a non-collateral dependent loan, the specific allowance is the amount by which the loan's amortized cost basis exceeds its net realizable value. We measure the specific allowance for collateral dependent loans as the amount by which the loan's amortized cost basis exceeds its fair value. When repayment is expected to be provided substantially through the sale of collateral, we deduct estimated selling costs from the collateral's fair value. Generally, 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 percent of the committed dollars in the loan portfolio is risk graded loans with general allowance model inputs that include probability of default, loss given default, and exposure at default. Probability of default is based on the migration of loans from performing to nonperforming using historical life of loan analysis periods. Loss given default is based on the aggregate losses incurred, net of estimated recoveries. Exposure at default represents an estimate of the outstanding amount of credit exposure at the time a default may occur.

Charge-off migration is used to calculate the general allowance for the majority of non-risk graded loans to individuals. The expected credit loss on less than 10 percent of the committed dollars in the portfolio is calculated using charge-off migration.

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The expected credit loss on approximately 1 percent 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.

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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, 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

	Three Months Ended
	March 31, 2022
	Commercial		Commercial Real Estate		Loans to Individuals		Total
Allowance for loan losses:
Beginning balance	$	162,056	$	58,553	$	35,812	$	256,421
Provision for loan losses	(5,118)		468		683		(3,967)
Loans charged off	(6,081)		(191)		(1,533)		(7,805)
Recoveries of loans previously charged off	591		144		1,089		1,824
Ending balance	$	151,448	$	58,974	$	36,051	$	246,473
Allowance for off-balance sheet credit risk from unfunded loan commitments:
Beginning balance	$	13,812	$	17,442	$	1,723	$	32,977
Provision for off-balance sheet credit risk	154		3,023		91		3,268
Ending balance	$	13,966	$	20,465	$	1,814	$	36,245

A $16.0 million provision for credit losses was necessary for the first quarter of 2023, as key economic assumptions in the base case, including projected WTI oil prices and commercial real estate vacancy rates, were less favorable to economic growth.

The allowance for loan losses and recorded investment of the related loans by portfolio segment for each measurement method at March 31, 2023 is as follows (in thousands):

	Collectively Measured for General Allowances				Individually Measured for Specific Allowances				Total
	Recorded Investment		Related Allowance		Recorded Investment		Related Allowance		Recorded Investment		Related Allowance
Commercial	$	14,162,917	$	137,415	$	54,432	$	2,483	$	14,217,349	$	139,898
Commercial real estate	4,793,648		64,453		21,668		1,550		4,815,316		66,003
Loans to individuals	3,673,193		43,559		44,195		—		3,717,388		43,559
Total	$	22,629,758	$	245,427	$	120,295	$	4,033	$	22,750,053	$	249,460

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The allowance for loan losses and recorded investment of the related loans by portfolio segment for each measurement method at December 31, 2022 is as follows (in thousands):

	Collectively Measured for General Allowances				Individually Measured for Specific Allowances				Total
	Recorded Investment		Related Allowance		Recorded Investment		Related Allowance		Recorded Investment		Related Allowance
Commercial	$	14,152,202	$	127,566	$	60,297	$	4,020	$	14,212,499	$	131,586
Commercial real estate	4,590,207		56,098		16,570		1,550		4,606,777		57,648
Loans to individuals	3,692,944		46,470		44,930		—		3,737,874		46,470
Total	$	22,435,353	$	230,134	$	121,797	$	5,570	$	22,557,150	$	235,704

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.

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The following table summarizes the Company’s loan portfolio at March 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:
Energy
Pass	$	12,973	$	146,448	$	66,052	$	8,865	$	11,301	$	11,408	$	3,119,103	$	—	$	3,376,150
Accruing Substandard	—		—		—		—		658		1,060		20,062		—		21,780
Nonaccrual	—		—		—		—		—		127		—		—		127
Total energy	12,973		146,448		66,052		8,865		11,959		12,595		3,139,165		—		3,398,057
Loans charged-off, year-to-date	—		—		—		—		—		—		—		—		—
Healthcare
Pass	175,703		876,440		615,643		479,575		386,837		1,027,229		220,992		19		3,782,438
Special Mention	—		—		204		429		21,767		45,663		60		—		68,123
Accruing Substandard	—		—		—		2,178		1,456		7,899		—		—		11,533
Nonaccrual	—		—		—		—		26,137		11,110		—		—		37,247
Total healthcare	175,703		876,440		615,847		482,182		436,197		1,091,901		221,052		19		3,899,341
Loans charged-off, year-to-date	—		—		—		—		—		—		—		—		—
Services
Pass	216,237		759,320		470,813		275,065		171,904		805,240		799,522		506		3,498,607
Special Mention	—		19,077		1,365		219		672		2,521		6,246		—		30,100
Accruing Substandard	—		397		86		—		2,232		2,599		21,499		84		26,897
Nonaccrual	—		—		5,281		376		—		—		2,441		—		8,098
Total services	216,237		778,794		477,545		275,660		174,808		810,360		829,708		590		3,563,702
Loans charged-off, year-to-date	—		—		—		—		—		—		5		—		5
General business
Pass	288,367		607,548		320,451		162,810		147,988		355,227		1,336,404		2,193		3,220,988
Special Mention	—		7,515		8,200		87		70		1,762		31,903		25		49,562
Accruing Substandard	5,516		38,443		6,841		56		4,013		7,940		13,929		—		76,738
Nonaccrual	—		—		—		1,030		14		68		7,842		7		8,961
Total general business	293,883		653,506		335,492		163,983		152,085		364,997		1,390,078		2,225		3,356,249
Loans charged-off, year-to-date	—		—		—		—		—		3		—		4		7
Total commercial	698,796		2,455,188		1,494,936		930,690		775,049		2,279,853		5,580,003		2,834		14,217,349

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	Origination Year
	2023		2022		2021		2020		2019		Prior		Revolving Loans		Revolving Loans Converted to Term Loans		Total
Commercial real estate:
Pass	46,900		1,383,300		1,187,644		540,129		644,511		832,101		148,063		—		4,782,648
Special Mention	—		—		—		—		—		11,000		—		—		11,000
Nonaccrual	—		—		—		—		7,459		14,209		—		—		21,668
Total commercial real estate	46,900		1,383,300		1,187,644		540,129		651,970		857,310		148,063		—		4,815,316
Loans charged-off, year-to-date	—		—		—		—		—		2,208		—		—		2,208
Loans to individuals:
Residential mortgage
Pass	71,000		348,697		371,044		380,908		61,409		285,877		351,428		21,242		1,891,605
Special Mention	—		68		—		1,355		—		309		2,843		—		4,575
Accruing Substandard	—		—		—		—		—		7		147		—		154
Nonaccrual	—		1,184		1,738		2,851		649		20,547		1,994		730		29,693
Total residential mortgage	71,000		349,949		372,782		385,114		62,058		306,740		356,412		21,972		1,926,027
Loans charged-off, year-to-date	—		—		—		—		—		4		—		1		5
Residential mortgage guaranteed by U.S. government agencies
Pass	—		1,021		2,321		7,321		8,963		190,825		—		—		210,451
Nonaccrual	—		—		—		299		1,005		12,998		—		—		14,302
Total residential mortgage guaranteed by U.S. government agencies	—		1,021		2,321		7,620		9,968		203,823		—		—		224,753
Personal:
Pass	24,231		236,041		190,370		156,515		181,332		220,604		550,478		253		1,559,824
Special Mention	—		115		109		47		2		—		6,055		39		6,367
Accruing Substandard	—		17		40		—		160		—		—		—		217
Nonaccrual	—		69		5		10		19		19		78		—		200
Total personal	24,231		236,242		190,524		156,572		181,513		220,623		556,611		292		1,566,608
Loans charged-off, year-to-date	—		—		—		—		—		1,437		1		4		1,442
Total loans to individuals	95,231		587,212		565,627		549,306		253,539		731,186		913,023		22,264		3,717,388
Total loans	$	840,927	$	4,425,700	$	3,248,207	$	2,020,125	$	1,680,558	$	3,868,349	$	6,641,089	$	25,098	$	22,750,053

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The following table summarizes the Company's loan portfolio at December 31, 2022 by the risk grade categories and vintage (in thousands): 

	Origination Year
	2022		2021		2020		2019		2018		Prior		Revolving Loans		Revolving Loans Converted to Term Loans		Total
Commercial:
Energy
Pass	$	157,745	$	76,951	$	30,284	$	12,783	$	5,992	$	4,980	$	3,104,906	$	—	$	3,393,641
Special Mention	—		—		—		—		—		—		—		—		—
Accruing Substandard	—		—		—		664		385		683		28,018		—		29,750
Nonaccrual	—		—		—		—		—		159		1,240		—		1,399
Total energy	157,745		76,951		30,284		13,447		6,377		5,822		3,134,164		—		3,424,790
Healthcare
Pass	932,097		604,886		476,854		404,204		464,989		618,163		245,898		20		3,747,111
Special Mention	—		—		—		20,071		—		18,859		4		—		38,934
Accruing Substandard	—		—		—		—		—		14,304		3,634		—		17,938
Nonaccrual	—		—		—		26,480		6,373		8,181		—		—		41,034
Total healthcare	932,097		604,886		476,854		450,755		471,362		659,507		249,536		20		3,845,017
Services
Pass	821,785		496,510		286,085		193,481		156,736		696,300		722,371		639		3,373,907
Special Mention	502		5,139		989		771		894		1,345		8,668		—		18,308
Accruing Substandard	—		—		—		2,459		43		2,789		17,665		122		23,078
Nonaccrual	—		5,570		449		—		—		2,389		7,820		—		16,228
Total services	822,287		507,219		287,523		196,711		157,673		702,823		756,524		761		3,431,521
General business
Pass	725,894		361,839		198,274		172,878		139,140		283,694		1,570,536		2,329		3,454,584
Special Mention	17,759		13,065		208		71		7		2,291		7,094		26		40,521
Accruing Substandard	—		2,169		66		4,130		4,680		3,287		94		4		14,430
Nonaccrual	—		—		1,052		14		72		5		485		8		1,636
Total general business	743,653		377,073		199,600		177,093		143,899		289,277		1,578,209		2,367		3,511,171
Total commercial	2,655,782		1,566,129		994,261		838,006		779,311		1,657,429		5,718,433		3,148		14,212,499
Commercial real estate:
Pass	1,188,483		1,158,002		552,616		641,102		247,625		633,304		161,616		—		4,582,748
Special Mention	—		—		—		—		—		—		—		—		—
Accruing Substandard	—		—		—		7,459		—		—		—		—		7,459
Nonaccrual	—		—		—		—		—		16,570		—		—		16,570
Total commercial real estate	1,188,483		1,158,002		552,616		648,561		247,625		649,874		161,616		—		4,606,777

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	Origination Year
	2022		2021		2020		2019		2018		Prior		Revolving Loans		Revolving Loans Converted to Term Loans		Total
Loans to individuals:
Residential mortgage
Pass	354,497		373,190		393,002		63,142		40,525		260,625		352,126		22,176		1,859,283
Special Mention	—		81		42		—		142		388		527		87		1,267
Accruing Substandard	—		—		187		—		—		138		117		1		443
Nonaccrual	32		1,656		2,717		362		1,904		20,139		2,216		765		29,791
Total residential mortgage	354,529		374,927		395,948		63,504		42,571		281,290		354,986		23,029		1,890,784
Residential mortgage guaranteed by U.S. government agencies
Pass	289		2,254		9,000		10,722		17,244		191,426		—		—		230,935
Nonaccrual	—		—		299		1,460		2,319		10,927		—		—		15,005
Total residential mortgage guaranteed by U.S. government agencies	289		2,254		9,299		12,182		19,563		202,353		—		—		245,940
Personal:
Pass	254,497		193,095		154,887		172,114		68,871		201,278		549,187		332		1,594,261
Special Mention	47		28		40		12		17		—		6,003		4		6,151
Accruing Substandard	—		444		—		160		—		—		—		—		604
Nonaccrual	38		7		12		22		14		18		23		—		134
Total personal	254,582		193,574		154,939		172,308		68,902		201,296		555,213		336		1,601,150
Total loans to individuals	609,400		570,755		560,186		247,994		131,036		684,939		910,199		23,365		3,737,874
Total loans	$	4,453,665	$	3,294,886	$	2,107,063	$	1,734,561	$	1,157,972	$	2,992,242	$	6,790,248	$	26,513	$	22,557,150

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Nonaccruing Loans

A summary of nonaccruing loans at March 31, 2023 follows (in thousands): 

	As of March 31, 2023
	Total		With No Allowance		With Allowance		Related Allowance
Commercial:
Energy	$	127	$	127	$	—	$	—
Healthcare	37,247		37,247		—		—
Services	8,097		387		7,710		2,483
General business	8,961		8,961		—		—
Total commercial	54,432		46,722		7,710		2,483
Commercial real estate	21,668		7,628		14,040		1,550
Loans to individuals:
Residential mortgage	29,693		29,693		—		—
Residential mortgage guaranteed by U.S. government agencies	14,302		14,302		—		—
Personal	200		200		—		—
Total loans to individuals	44,195		44,195		—		—
Total	$	120,295	$	98,545	$	21,750	$	4,033

A summary of nonaccruing loans at December 31, 2022 follows (in thousands): 

	As of December 31, 2022
	Total		With No Allowance		With Allowance		Related Allowance
Commercial:
Energy	$	1,399	$	1,399	$	—	$	—
Healthcare	41,034		34,661		6,373		946
Services	16,228		7,835		8,393		3,074
General business	1,636		1,636		—		—
Total commercial	60,297		45,531		14,766		4,020
Commercial real estate	16,570		393		16,177		1,550
Loans to individuals:
Residential mortgage	29,791		29,791		—		—
Residential mortgage guaranteed by U.S. government agencies	15,005		15,005		—		—
Personal	134		134		—		—
Total loans to individuals	44,930		44,930		—		—
Total	$	121,797	$	90,854	$	30,943	$	5,570

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Loan Modifications to Borrowers Experiencing Financial Difficulty

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. Modifications generally consist of interest rate reductions, an other than insignificant payment delay, term extension or a combination. During the three months ended March 31, 2023, $511 thousand of residential mortgage loans guaranteed by U.S. government agencies were modified and subsequently defaulted. A payment default is defined as being 30 or more days past due after modification.

Past Due Loans

Past due status for all loan classes is based on the actual number of days since the last payment was due according to the contractual terms of the loans, as modified for short-term payment deferral forbearance.

A summary of loans currently performing and past due as of March 31, 2023 is as follows (in thousands):

			Past Due								Past Due 90 Days or More and Accruing
	Current		30 to 59 Days		60 to 89 Days		90 Days or More		Total
Commercial:
Energy	$	3,398,057	$	—	$	—	$	—	$	3,398,057	$	—
Healthcare	3,866,921		—		—		32,420		3,899,341		45
Services	3,556,753		6,844		45		60		3,563,702		—
General business	3,355,731		492		17		9		3,356,249		9
Total commercial	14,177,462		7,336		62		32,489		14,217,349		54
Commercial real estate	4,806,306		8,965		45		—		4,815,316		—
Loans to individuals:
Residential mortgage	1,910,799		8,315		363		6,550		1,926,027		22
Residential mortgage guaranteed by U.S. government agencies	103,992		48,833		—		71,928		224,753		64,980
Personal	1,565,875		567		143		23		1,566,608		—
Total loans to individuals	3,580,666		57,715		506		78,501		3,717,388		65,002
Total	$	22,564,434	$	74,016	$	613	$	110,990	$	22,750,053	$	65,056

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A summary of loans currently performing and past due as of December 31, 2022 is as follows (in thousands):

			Past Due								Past Due 90 Days or More and Accruing
	Current		30 to 59 Days		60 to 89 Days		90 Days or More		Total
Commercial:
Energy	$	3,424,766	$	24	$	—	$	—	$	3,424,790	$	—
Healthcare	3,812,164		5,914		26,480		459		3,845,017		—
Services	3,423,042		1,060		2,461		4,958		3,431,521		—
General business	3,509,094		257		1,424		396		3,511,171		396
Total commercial	14,169,066		7,255		30,365		5,813		14,212,499		396
Commercial real estate	4,606,029		531		—		217		4,606,777		—
Loans to individuals:
Residential mortgage	1,872,155		10,632		1,828		6,169		1,890,784		114
Residential mortgage guaranteed by U.S. government agencies	108,019		36,119		19,400		82,402		245,940		75,604
Personal	1,600,595		502		21		32		1,601,150		—
Total loans to individuals	3,580,769		47,253		21,249		88,603		3,737,874		75,718
Total	$	22,355,864	$	55,039	$	51,614	$	94,633	$	22,557,150	$	76,114

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(5) 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, 2023				December 31, 2022
	Unpaid Principal Balance/ Notional		Fair Value		Unpaid Principal Balance/ Notional		Fair Value
Residential mortgage loans held for sale	$	72,746	$	72,113	$	74,941	$	73,938
Residential mortgage loan commitments	71,693		2,694		45,492		1,054
Forward sales contracts	127,427		(632)		109,469		280
			$	74,175			$	75,272

No residential mortgage loans held for sale were 90 days or more past due or considered impaired as of March 31, 2023 or December 31, 2022. No credit losses were recognized on residential mortgage loans held for sale for the three month period ended March 31, 2023 and 2022.

Mortgage banking revenue was as follows (in thousands):

	Three Months Ended March 31,
	2023		2022
Production revenue:
Net realized gains (losses) on sale of mortgage loans	$	(1,731)	$	6,883
Net change in unrealized gain (loss) on mortgage loans held for sale	370		(5,827)
Net change in the fair value of mortgage loan commitments	1,640		(3,298)
Net change in the fair value of forward sales contracts	(912)		7,297
Total production revenue	(633)		5,055
Servicing revenue	15,000		11,595
Total mortgage banking revenue	$	14,367	$	16,650

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.

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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, 2023			December 31, 2022
Number of residential mortgage loans serviced for others	118,303			110,541
Outstanding principal balance of residential mortgage loans serviced for others	$	21,009,762		$	18,863,201
Weighted average interest rate	3.55		%	3.59		%
Remaining term (in months)	285			283

The following represents activity in capitalized mortgage servicing rights (in thousands)

	Three Months Ended March 31,
	2023		2022
Beginning Balance	$	277,608	$	163,198
Additions	2,500		5,215
Acquisitions	31,138		—
Change in fair value due to principal payments	(5,384)		(7,960)
Change in fair value due to market assumption changes	(6,059)		49,110
Ending Balance	$	299,803	$	209,563

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, 2023	December 31, 2022
Discount rate – risk-free rate plus a market premium	8.95%	9.51%
Prepayment rate - based upon loan interest rate, original term and loan type	7.43%	7.54%
Loan servicing costs – annually per loan based upon loan type:
Performing loans	$69 - $94	$69 - $94
Delinquent loans	$150 - $500	$150 - $500
Loans in foreclosure	$875 - $8,000	$875 - $8,000
Escrow earnings rate – indexed to rates paid on deposit accounts with comparable average life	3.66%	4.06%
Primary/secondary mortgage rate spread	105 bps	105 bps
Delinquency rate	1.40%	2.33%

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 Financia's servicing portfolio.

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(6) Commitments and Contingent Liabilities

Litigation Contingencies

On June 24, 2015, BOKF, NA received a complaint that an employee had colluded with a bond issuer and an individual in misusing revenues pledged to municipal bonds for which BOKF, NA served as trustee under the bond indenture. The Company conducted an investigation and concluded that employees in one of its Corporate Trust offices had, with respect to a single group of affiliated bond issuances, violated Company policies and procedures. The relationship manager was terminated. The Company reported the circumstances to, and cooperated with an investigation by, the Securities and Exchange Commission ("SEC"). On September 7, 2016, BOKF, NA agreed to, and the SEC entered, a consent order finding that BOKF, NA had violated Section 17(a) of the Securities Act of 1933 and Section 10(b) of the Securities Exchange Act and required BOKF, NA to disgorge $1,067,721 of fees and pay a civil penalty of $600,000. BOKF, NA disgorged the fees and paid the penalty. On August 26, 2016, BOKF, NA was sued in the United States District Court for New Jersey by two bondholders in a putative class action alleging BOKF, NA participated in the fraudulent sale of securities by the principals. The action remains stayed with no current deadlines pending. On September 14, 2016, BOKF, NA was sued in the District Court of Tulsa County, Oklahoma by 19 bondholders also alleging BOKF, NA participated in the fraudulent sale of securities by the principals. The plaintiffs' recently filed a Fourth Amended Petition to which BOKF is preparing to respond. Management is advised by counsel that, in the Tulsa County District Court action, a loss is not probable and that the loss, if any, cannot be reasonably estimated.

On December 28, 2015, in an action brought by the SEC, the New Jersey District Court entered a judgment against the principals involved in issuing the bonds. On January 8, 2020, the Court entered judgment against the principal individual and his wife for $36,805,051 in principal amount and $10,937,831 in pre-judgment interest. The SEC continues to aggressively pursue collection of the judgment. If the individual principal and his wife cannot pay the bonds, a bondholder loss could become probable. Management has been advised by counsel that BOKF, NA has valid defenses to claims of bondholders and that no loss to the Company is probable. No provision for losses has been made at this time. BOKF, NA estimates that, upon sale of all remaining collateral securing payment of the bonds, approximately $25 million in principal will remain outstanding. A reasonable estimate cannot be made of the amount of any bondholder loss, though the amount of bondholder loss could be material to the Company in the event a loss to the Company becomes probable.

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, 2023, the Company has $401 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. This investment balance also includes $94 million of unfunded commitments included in Other liabilities on the Consolidated Balance Sheets.

(7) Shareholders' Equity

On May 2, 2023, the Company declared a quarterly cash dividend of $0.54 per common share payable on or about May 30, 2023 to shareholders of record as of May 15, 2023.

Dividends declared were $0.54 per share during the three months ended March 31, 2023 and $0.53 per share during the three months ended March 31, 2022.

Accumulated Other Comprehensive Income (Loss)

AOCI includes unrealized gains and losses on available for sale ("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.

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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		Employee Benefit Plans		Total
Balance, Dec. 31, 2021	$	69,775	$	—	$	2,596	$	72,371
Net change in unrealized gain (loss)	(639,041)		—		—		(639,041)
Reclassification adjustments included in earnings:
Gain on available for sale securities, net	(937)		—		—		(937)
Other comprehensive loss, before income taxes	(639,978)		—		—		(639,978)
Federal and state income taxes	(149,781)		—		—		(149,781)
Other comprehensive loss, net of income taxes	(490,197)		—		—		(490,197)
Balance, March 31, 2022	$	(420,422)	$	—	$	2,596	$	(417,826)
Balance, Dec. 31, 2022	$	(664,618)	$	(172,337)	$	—	$	(836,955)
Net change in unrealized gain (loss)	124,045		—		—		124,045
Interest revenue, Investment securities	—		16,051		—		16,051
Other comprehensive loss, 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)

(8) Earnings Per Share

(In thousands, except share and per share amounts)	Three Months Ended March 31,
	2023		2022
Numerator:
Net income attributable to BOK Financial Corp. shareholders	$	162,368	$	62,488
Less: Earnings allocated to participating securities	1,255		451
Numerator for basic earnings per share – income available to common shareholders	161,113		62,037
Effect of reallocating undistributed earnings of participating securities	—		—
Numerator for diluted earnings per share – income available to common shareholders	$	161,113	$	62,037
Denominator:
Weighted average shares outstanding	66,849,288		68,306,107
Less:  Participating securities included in weighted average shares outstanding	517,513		493,707
Denominator for basic earnings per common share	66,331,775		67,812,400
Dilutive effect of employee stock compensation plans	—		1,451
Denominator for diluted earnings per common share	66,331,775		67,813,851
Basic earnings per share	$	2.43	$	0.91
Diluted earnings per share	$	2.43	$	0.91

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(9) Reportable Segments

Reportable segments reconciliation to the Consolidated Financial Statements for the three months ended March 31, 2023 is as follows (in thousands):

	Commercial		Consumer		Wealth Management		Funds Management and Other		BOK Financial Consolidated
Net interest revenue from external sources	$	287,646	$	21,146	$	20,940	$	22,616	$	352,348
Net interest revenue (expense) from internal sources	(21,101)		88,235		33,166		(100,300)		—
Net interest revenue (expense)	266,545		109,381		54,106		(77,684)		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	266,469		108,197		54,130		(92,448)		336,348
Other operating revenue	56,845		30,610		108,911		(18,501)		177,865
Other operating expense	73,504		50,198		82,039		100,071		305,812
Net direct contribution	249,810		88,609		81,002		(211,020)		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	17,729		11,618		12,386		(41,733)		—
Net income (loss) before taxes	232,882		66,273		68,616		(159,370)		208,401
Federal and state income taxes	56,335		15,586		16,189		(42,205)		45,905
Net income (loss)	176,547		50,687		52,427		(117,165)		162,496
Net income attributable to non-controlling interests	—		—		—		128		128
Net income (loss) attributable to BOK Financial Corp. shareholders	$	176,547	$	50,687	$	52,427	$	(117,293)	$	162,368
Average assets	$	28,162,934	$	9,934,511	$	11,663,096	$	(3,778,073)	$	45,982,468

Reportable segments reconciliation to the Consolidated Financial Statements for the three months ended March 31, 2022 is as follows (in thousands):

	Commercial		Consumer		Wealth Management		Funds Management and Other		BOK Financial Consolidated
Net interest revenue from external sources	$	147,590	$	16,915	$	56,231	$	47,675	$	268,411
Net interest revenue (expense) from internal sources	(10,579)		10,292		(465)		752		—
Net interest revenue	137,011		27,207		55,766		48,427		268,411
Net loans charged off and provision for credit losses	5,343		1,112		(71)		(6,384)		—
Net interest revenue after provision for credit losses	131,668		26,095		55,837		54,811		268,411
Other operating revenue	57,427		33,961		25,018		(28,550)		87,856
Other operating expense	65,114		48,789		74,620		89,095		277,618
Net direct contribution	123,981		11,267		6,235		(62,834)		78,649
Gain (loss) on financial instruments, net	(204)		(57,895)		—		58,099		—
Change in fair value of mortgage servicing rights	—		49,110		—		(49,110)		—
Gain (loss) on repossessed assets, net	1,793		45		—		(1,838)		—
Corporate expense allocations	16,246		12,080		12,071		(40,397)		—
Net income before taxes	109,324		(9,553)		(5,836)		(15,286)		78,649
Federal and state income taxes	26,980		(2,236)		(1,315)		(7,232)		16,197
Net income	82,344		(7,317)		(4,521)		(8,054)		62,452
Net loss attributable to non-controlling interests	—		—		—		(36)		(36)
Net income attributable to BOK Financial Corp. shareholders	$	82,344	$	(7,317)	$	(4,521)	$	(8,018)	$	62,488
Average assets	$	29,823,905	$	10,273,890	$	21,323,795	$	(10,860,516)	$	50,561,074

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(10) 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 the Bank. 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.

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Fees and commissions revenue by reportable segment and primary service line is as follows for the three months ended March 31, 2023.

	Commercial		Consumer		Wealth Management		Funds Management & Other		Consolidated		Out of Scope1		In Scope2
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	—		—		23,945		—		23,945		—		23,945
Corporate trust revenue	—		—		7,660		—		7,660		—		7,660
Institutional trust & retirement plan services revenue	—		—		12,835		—		12,835		—		12,835
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.

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Fees and commissions revenue by reportable segment and primary service line is as follows for the three months ended March 31, 2022.

	Commercial		Consumer		Wealth Management		Funds Management & Other		Consolidated		Out of Scope1		In Scope2
Trading revenue	$	—	$	—	$	(54,048)	$	—	$	(54,048)	$	(54,048)	$	—
Customer hedging revenue	12,979		—		817		(2,858)		10,938		10,938		—
Retail brokerage revenue	—		—		4,610		—		4,610		—		4,610
Insurance brokerage revenue	—		—		3,738		—		3,738		—		3,738
Investment banking revenue	3,358		—		4,325		—		7,683		3,099		4,584
Brokerage and trading revenue	16,337		—		(40,558)		(2,858)		(27,079)		(40,011)		12,932
TransFund EFT network revenue	18,153		886		(17)		1		19,023		—		19,023
Merchant services revenue	3,641		10		—		—		3,651		—		3,651
Corporate card revenue	1,376		—		76		90		1,542		—		1,542
Transaction card revenue	23,170		896		59		91		24,216		—		24,216
Personal trust revenue	—		—		24,797		—		24,797		—		24,797
Corporate trust revenue	—		—		3,958		—		3,958		—		3,958
Institutional trust & retirement plan services revenue	—		—		12,567		—		12,567		—		12,567
Investment management services and other revenue	—		—		5,121		(44)		5,077		—		5,077
Fiduciary and asset management revenue	—		—		46,443		(44)		46,399		—		46,399
Commercial account service charge revenue	13,131		450		513		—		14,094		—		14,094
Overdraft fee revenue	31		6,193		23		—		6,247		—		6,247
Check card revenue	—		5,545		—		—		5,545		—		5,545
Automated service charge and other deposit fee revenue	23		1,107		(14)		2		1,118		—		1,118
Deposit service charges and fees	13,185		13,295		522		2		27,004		—		27,004
Mortgage production revenue	—		5,055		—		—		5,055		5,055		—
Mortgage servicing revenue	—		12,076		—		(481)		11,595		11,595		—
Mortgage banking revenue	—		17,131		—		(481)		16,650		16,650		—
Other revenue	4,272		2,655		18,557		(15,039)		10,445		7,275		3,170
Total fees and commissions revenue	$	56,964	$	33,977	$	25,023	$	(18,329)	$	97,635	$	(16,086)	$	113,721

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.

(11) 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 Compan'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.

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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, 2023 and 2022, respectively. Transfers between significant other observable inputs and significant unobservable inputs during the three months ended March 31, 2023 and 2022 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, 2023 or December 31, 2022.

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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, 2023 (in thousands):

	Total		Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Trading securities:
U.S. government securities	$	5,618	$	4,878	$	740	$	—
Residential agency mortgage-backed securities	2,210,721		—		2,210,721		—
Municipal securities	37,455		—		37,455		—
Asset-backed securities	10,194		—		10,194		—
Other trading securities	30,370		—		30,370		—
Total trading securities	2,294,358		4,878		2,289,480		—
Available for sale securities:
U.S. Treasury	914		914		—		—
Municipal securities	634,207		—		634,207		—
Residential agency mortgage-backed securities	6,022,708		—		6,022,708		—
Residential non-agency mortgage-backed securities	651,351		—		651,351		—
Commercial agency mortgage-backed securities	4,628,188		—		4,628,188		—
Other debt securities	473		—		—		473
Total available for sale securities	11,937,841		914		11,936,454		473
Fair value option securities:
U.S. Treasury	106,307		106,307		—		—
Residential agency mortgage-backed securities	220,083		—		220,083		—
Total fair value option securities	326,390		106,307		220,083		—
Residential mortgage loans held for sale1	74,175		—		67,024		7,151
Mortgage servicing rights2	299,803		—		—		299,803
Derivative contracts, net of cash collateral3	394,291		303		393,988		—
Liabilities:
Derivative contracts, net of cash collateral3	510,483		3,822		506,661		—

1Residential 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 77.43% of the unpaid principal balance.

2A 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.

3See 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.

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The fair value of financial assets and liabilities measured on a recurring basis was as follows as of December 31, 2022 (in thousands):

	Total		Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Trading securities:
U.S. government securities	$	9,823	$	4,970	$	4,853	$	—
Residential agency mortgage-backed securities	4,406,848		—		4,406,848		—
Municipal securities	21,484		—		21,484		—
Other trading securities	26,006		—		26,006		—
Total trading securities	4,464,161		4,970		4,459,191		—
Available for sale securities:
U.S. Treasury	898		898		—		—
Municipal securities	624,500		—		624,500		—
Residential agency mortgage-backed securities	5,814,496		—		5,814,496		—
Residential non-agency mortgage-backed securities	577,576		—		577,576		—
Commercial agency mortgage-backed securities	4,475,917		—		4,475,917		—
Other debt securities	473		—		—		473
Total available for sale securities	11,493,860		898		11,492,489		473
Fair value option securities — Residential agency mortgage-backed securities	296,590		—		296,590		—
Residential mortgage loans held for sale1	75,272		—		68,054		7,218
Mortgage servicing rights2	277,608		—		—		277,608
Derivative contracts, net of cash collateral3	880,343		2,110		878,233		—
Liabilities:
Derivative contracts, net of cash collateral3	554,900		16		554,884		—

1Residential 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 77.55% of the unpaid principal balance.

2A 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.

3See 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.

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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 Capital Markets, 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.

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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, 2023 for which the fair value was adjusted during the three months ended March 31, 2023:

							Fair Value Adjustments for the
	Carrying Value at March 31, 2023						Three Months Ended Mar. 31, 2023 Recognized in:
	Quoted Prices in Active Markets for Identical Instruments		Significant Other Observable Inputs		Significant Unobservable Inputs		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 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, 2022 for which the fair value was adjusted during the three months ended March 31, 2022:

							Fair Value Adjustments for the
	Carrying Value at March 31, 2022						Three Months Ended Mar. 31, 2022 Recognized in:
	Quoted Prices in Active Markets for Identical Instruments		Significant Other Observable Inputs		Significant Unobservable Inputs		Gross charge-offs against allowance for loan losses		Other gains (losses), net
Nonaccruing loans	$	—	$	4,168	$	244	$	818	$	—
Real estate and other repossessed assets	—		1,412		400		—		106

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.

- 79 -

A summary of quantitative information about Non-recurring Fair Value Measurements based on Significant Unobservable Inputs (Level 3) as of March 31, 2023 follows (in thousands):

	Fair Value		Valuation Technique(s)	Unobservable Input	Range (Weighted Average)
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.    

A summary of quantitative information about Non-recurring Fair Value Measurements based on Significant Unobservable Inputs (Level 3) as of March 31, 2022 follows (in thousands):

	Fair Value		Valuation Technique(s)	Unobservable Input	Range (Weighted Average)
Nonaccruing loans	$	244	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	3% - 25% (5%)1
Real estate and other repossessed assets	400		Discounted cash flows	Marketability adjustments off appraised value.2	75% - 75% (75%)

1    Represents fair value as a percentage of the unpaid principal balance.

2     Marketability adjustments include consideration of estimated costs to sell which is approximately 10% of the fair value.

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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, 2023 (dollars in thousands):

	Carrying Value		Estimated Fair Value		Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash and due from banks	$	792,371	$	792,371	$	792,371	$	—	$	—
Interest-bearing cash and cash equivalents	571,613		571,613		571,613		—		—
Trading securities:
U.S. government securities	5,618		5,618		4,878		740		—
Residential agency mortgage-backed securities	2,210,721		2,210,721		—		2,210,721		—
Municipal securities	37,455		37,455		—		37,455		—
Asset-backed securities	10,194		10,194		—		10,194		—
Other trading securities	30,370		30,370		—		30,370		—
Total trading securities	2,294,358		2,294,358		4,878		2,289,480		—
Investment securities:
Municipal securities	153,739		160,866		—		33,158		127,708
Residential agency mortgage-backed securities	2,264,922		2,118,538		—		2,118,538		—
Commercial agency mortgage-backed securities	15,684		14,861		—		14,861		—
Other debt securities	14,288		13,421		—		13,421		—
Total investment securities	2,448,633		2,307,686		—		2,179,978		127,708
Allowance for credit losses	(497)		—		—		—		—
Investment securities, net of allowance	2,448,136		2,307,686		—		2,179,978		127,708
Available for sale securities:
U.S. Treasury	914		914		914		—		—
Municipal securities	634,207		634,207		—		634,207		—
Residential agency mortgage-backed securities	6,022,708		6,022,708		—		6,022,708		—
Residential non-agency mortgage-backed securities	651,351		651,351		—		651,351		—
Commercial agency mortgage-backed securities	4,628,188		4,628,188		—		4,628,188		—
Other debt securities	473		473		—		—		473
Total available for sale securities	11,937,841		11,937,841		914		11,936,454		473
Fair value option securities:
U.S. Treasury	106,307		106,307		106,307		—		—
Residential agency mortgage-backed securities	220,083		220,083		—		220,083		—
Total fair value option securities	326,390		326,390		106,307		220,083		—
Residential mortgage loans held for sale	74,175		74,175		—		67,024		7,151
Loans:
Commercial	14,217,349		14,129,311		—		—		14,129,311
Commercial real estate	4,815,316		4,703,787		—		—		4,703,787
Loans to individuals	3,717,388		3,547,326		—		—		3,547,326
Total loans	22,750,053		22,380,424		—		—		22,380,424
Allowance for loan losses	(249,460)		—		—		—		—
Loans, net of allowance	22,500,593		22,380,424		—		—		22,380,424
Mortgage servicing rights	299,803		299,803		—		—		299,803
Derivative instruments with positive fair value, net of cash collateral	394,291		394,291		303		393,988		—
Deposits with no stated maturity	31,004,137		31,004,137		—		—		31,004,137
Time deposits	1,576,610		1,547,154		—		—		1,547,154
Other borrowed funds	6,335,609		6,333,599		—		—		6,333,599
Subordinated debentures	131,148		125,077		—		125,077		—
Derivative instruments with negative fair value, net of cash collateral	510,483		510,483		3,822		506,661		—

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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, 2022 (dollars in thousands):

	Carrying Value		Estimated Fair Value		Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash and due from banks	$	943,810	$	943,810	$	943,810	$	—	$	—
Interest-bearing cash and cash equivalents	457,906		457,906		457,906		—		—
Trading securities:
U.S. government securities	9,823		9,823		4,970		4,853		—
Residential agency mortgage-backed securities	4,406,848		4,406,848		—		4,406,848		—
Municipal securities	21,484		21,484		—		21,484		—
Other trading securities	26,006		26,006		—		26,006		—
Total trading securities	4,464,161		4,464,161		4,970		4,459,191		—
Investment securities:
Municipal securities	170,629		176,621		—		38,106		138,515
Residential agency mortgage-backed securities	2,315,219		2,143,360		—		2,143,360		—
Commercial agency mortgage-backed securities	15,609		14,588		—		14,588		—
Other debt securities	12,788		12,199		—		12,199		—
Total investment securities	2,514,245		2,346,768		—		2,208,253		138,515
Allowance for credit losses	(558)		—		—		—		—
Investment securities, net of allowance	2,513,687		2,346,768		—		2,208,253		138,515
Available for sale securities:
U.S. Treasury	898		898		898		—		—
Municipal securities	624,500		624,500		—		624,500		—
Residential agency mortgage-backed securities	5,814,496		5,814,496		—		5,814,496		—
Residential non-agency mortgage-backed securities	577,576		577,576		—		577,576		—
Commercial agency mortgage-backed securities	4,475,917		4,475,917		—		4,475,917		—
Other debt securities	473		473		—		—		473
Total available for sale securities	11,493,860		11,493,860		898		11,492,489		473
Fair value option securities — Residential agency mortgage-backed securities	296,590		296,590		—		296,590		—
Residential mortgage loans held for sale	75,272		75,272		—		68,054		7,218
Loans:
Commercial	14,212,499		13,905,765		—		—		13,905,765
Commercial real estate	4,606,777		4,454,048		—		—		4,454,048
Loans to individuals	3,737,874		3,531,410		—		—		3,531,410
Total loans	22,557,150		21,891,223		—		—		21,891,223
Allowance for loan losses	(235,704)		—		—		—		—
Loans, net of allowance	22,321,446		21,891,223		—		—		21,891,223
Mortgage servicing rights	277,608		277,608		—		—		277,608
Derivative instruments with positive fair value, net of cash collateral	880,343		880,343		2,110		878,233		—
Deposits with no stated maturity	33,018,863		33,018,863		—		—		33,018,863
Time deposits	1,461,842		1,431,245		—		—		1,431,245
Other borrowed funds	7,007,285		7,005,305		—		—		7,005,305
Subordinated debentures	131,205		121,497		—		121,497		—
Derivative instruments with negative fair value, net of cash collateral	554,900		554,900		16		554,884		—

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.

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(12) Subsequent Events

The Company evaluated events from the date of the consolidated financial statements on March 31, 2023 through the issuance of those consolidated financial statements included in this Quarterly Report on Form 10-Q. No events were identified requiring recognition in and/or disclosure in the consolidated financial statements.

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Quarterly Financial Summary – Unaudited

Consolidated Daily Average Balances, Average Yields and Rates

(In thousands, except per share data)	Three Months Ended
	March 31, 2023						December 31, 2022
	Average Balance		Revenue/ Expense		Yield/ Rate		Average Balance		Revenue/ Expense		Yield/ Rate
Assets
Interest-bearing cash and cash equivalents	$	616,596	$	6,506	4.28	%	$	568,307	$	5,822	4.06	%
Trading securities	3,031,969		34,073		4.52	%	3,086,985		28,473		3.70	%
Investment securities, net of allowance	2,473,796		9,017		1.46	%	2,535,305		9,223		1.46	%
Available for sale securities	11,738,693		89,112		2.87	%	10,953,851		73,317		2.54	%
Fair value option securities	300,372		3,893		5.17	%	92,012		931		4.40	%
Restricted equity securities	316,724		5,808		7.34	%	216,673		3,088		5.70	%
Residential mortgage loans held for sale	65,769		979		5.79	%	98,613		1,390		5.56	%
Loans	22,476,247		369,626		6.67	%	21,976,004		331,649		5.99	%
Allowance for loan losses	(238,909)						(242,450)
Loans, net of allowance	22,237,338		369,626		6.74	%	21,733,554		331,649		6.06	%
Total earning assets	40,781,257		519,014		5.06	%	39,285,300		453,893		4.53	%
Receivable on unsettled securities sales	177,312						194,996
Cash and other assets	5,023,899						5,729,322
Total assets	$	45,982,468					$	45,209,618
Liabilities and equity
Interest-bearing deposits:
Transaction	$	18,639,900	$	87,936	1.91	%	$	18,898,315	$	60,893	1.28	%
Savings	958,443		248		0.10	%	969,275		205		0.08	%
Time	1,477,720		7,090		1.95	%	1,417,606		4,476		1.25	%
Total interest-bearing deposits	21,076,063		95,274		1.83	%	21,285,196		65,574		1.22	%
Funds purchased and repurchase agreements	1,759,237		14,450		3.33	%	1,046,447		5,407		2.05	%
Other borrowings	4,512,280		52,588		4.73	%	2,523,195		25,961		4.08	%
Subordinated debentures	131,166		2,069		6.40	%	131,180		2,038		6.16	%
Total interest-bearing liabilities	27,478,746		164,381		2.43	%	24,986,018		98,980		1.57	%
Non-interest bearing demand deposits	12,406,408						14,176,189
Due on unsettled securities purchases	316,738						575,957
Other liabilities	939,553						853,134
Total equity	4,841,023						4,618,320
Total liabilities and equity	$	45,982,468					$	45,209,618
Tax-equivalent Net Interest Revenue			$	354,633	2.63	%			$	354,913	2.96	%
Tax-equivalent Net Interest Revenue to Earning Assets					3.45	%					3.54	%
Less tax-equivalent adjustment			2,285						2,287
Net Interest Revenue			352,348						352,626
Provision for credit losses			16,000						15,000
Other operating revenue			177,865						197,086
Other operating expense			305,812						318,456
Income before taxes			208,401						216,256
Federal and state income taxes			45,905						47,864
Net income			162,496						168,392
Net income (loss) attributable to non-controlling interests			128						(37)
Net income attributable to BOK Financial Corp. shareholders			$	162,368					$	168,429
Earnings Per Average Common Share Equivalent:
Basic			$	2.43					$	2.51
Diluted			$	2.43					$	2.51

Yield calculations are shown on a tax equivalent at the statutory federal and state rates for the periods presented. The yield calculations exclude security trades that have been recorded on trade date with no corresponding interest income and the unrealized gains and losses. The yield calculation also includes average loan balances for which the accrual of interest has been discontinued and are net of unearned income. Yield / rate calculations are generally based on the conventions that determine how interest income and expense is accrued.

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(In thousands, except per share data)	Three Months Ended
	September 30, 2022						June 30, 2022
	Average Balance		Revenue /Expense		Yield / Rate		Average Balance		Revenue / Expense		Yield / Rate
Assets
Interest-bearing cash and cash equivalents	$	748,263	$	3,520	1.87	%	$	843,619	$	1,737	0.83	%
Trading securities	3,178,068		22,772		2.72	%	4,166,954		23,009		2.00	%
Investment securities, net of allowance	2,593,989		9,207		1.42	%	610,983		3,585		2.35	%
Available for sale securities	10,306,257		59,144		2.21	%	12,258,072		58,882		1.84	%
Fair value option securities	36,846		286		2.98	%	54,832		437		2.92	%
Restricted equity securities	173,656		2,703		6.23	%	167,732		1,384		3.30	%
Residential mortgage loans held for sale	132,685		1,684		5.05	%	148,183		1,559		4.22	%
Loans	21,599,232		265,997		4.89	%	21,057,714		205,694		3.92	%
Allowance for loan losses	(241,136)						(246,064)
Loans, net of allowance	21,358,096		265,997		4.94	%	20,811,650		205,694		3.96	%
Total earning assets	38,527,860		365,313		3.71	%	39,062,025		296,287		2.96	%
Receivable on unsettled securities sales	219,113						457,165
Cash and other assets	6,372,229						7,769,208
Total assets	$	45,119,202					$	47,288,398
Liabilities and equity
Interest-bearing deposits:
Transaction	$	19,556,806	$	31,266	0.63	%	$	21,037,294	$	11,454	0.22	%
Savings	978,596		135		0.05	%	981,493		76		0.03	%
Time	1,409,069		3,314		0.93	%	1,373,036		2,332		0.68	%
Total interest-bearing deposits	21,944,471		34,715		0.63	%	23,391,823		13,862		0.24	%
Funds purchased and repurchase agreements	800,759		1,445		0.72	%	1,224,134		1,608		0.53	%
Other borrowings	1,528,887		8,988		2.33	%	1,301,358		3,286		1.01	%
Subordinated debentures	131,199		1,677		5.07	%	131,219		1,473		4.50	%
Total interest-bearing liabilities	24,405,316		46,825		0.76	%	26,048,534		20,229		0.31	%
Non-interest bearing demand deposits	15,105,305						15,202,597
Due on unsettled securities purchases	331,428						380,332
Other liabilities	501,731						924,605
Total equity	4,775,422						4,732,330
Total liabilities and equity	$	45,119,202					$	47,288,398
Tax-equivalent Net Interest Revenue			$	318,488	2.95	%			$	276,058	2.65	%
Tax-equivalent Net Interest Revenue to Earning Assets					3.24	%					2.76	%
Less tax-equivalent adjustment			2,163						2,040
Net Interest Revenue			316,325						274,018
Provision for credit losses			15,000						—
Other operating revenue			189,698						168,617
Other operating expense			294,751						273,655
Income before taxes			196,272						168,980
Federal and state income taxes			39,681						36,122
Net income			156,591						132,858
Net income attributable to non-controlling interests			81						12
Net income attributable to BOK Financial Corp. shareholders			$	156,510					$	132,846
Earnings Per Average Common Share Equivalent:
Basic			$	2.32					$	1.96
Diluted			$	2.32					$	1.96

Yield calculations are shown on a tax equivalent at the statutory federal and state rates for the periods presented. The yield calculations exclude security trades that have been recorded on trade date with no corresponding interest income and the unrealized gains and losses. The yield calculation also includes average loan balances for which the accrual of interest has been discontinued and are net of unearned income. Yield / rate calculations are generally based on the conventions that determine how interest income and expense is accrued.

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(In thousands, except per share data)	Three Months Ended
	March 31, 2022
	Average Balance		Revenue / Expense		Yield / Rate
Assets
Interest-bearing cash and cash equivalents	$	1,050,409	$	473	0.18	%
Trading securities	8,537,390		41,041		1.71	%
Investment securities, net of allowance	195,198		2,475		5.07	%
Available for sale securities	13,092,422		58,018		1.77	%
Fair value option securities	75,539		491		2.81	%
Restricted equity securities	164,484		1,107		2.69	%
Residential mortgage loans held for sale	179,697		1,394		3.11	%
Loans	20,463,662		180,073		3.57	%
Allowance for loan losses	(254,191)
Loans, net of allowance	20,209,471		180,073		3.61	%
Total earning assets	43,504,610		285,072		2.58	%
Receivable on unsettled securities sales	375,616
Cash and other assets	6,680,848
Total assets	$	50,561,074
Liabilities and equity
Interest-bearing deposits:
Transaction	$	22,763,479	$	5,343	0.10	%
Savings	947,407		73		0.03	%
Time	1,589,039		2,182		0.56	%
Total interest-bearing deposits	25,299,925		7,598		0.12	%
Funds purchased and repurchase agreements	2,004,466		4,698		0.95	%
Other borrowings	1,148,440		1,090		0.38	%
Subordinated debentures	131,228		1,302		4.02	%
Total interest-bearing liabilities	28,584,059		14,688		0.21	%
Non-interest bearing demand deposits	15,062,282
Due on unsettled securities purchases	519,097
Other liabilities	1,247,785
Total equity	5,147,851
Total liabilities and equity	$	50,561,074
Tax-equivalent Net Interest Revenue			$	270,384	2.37	%
Tax-equivalent Net Interest Revenue to Earning Assets					2.44	%
Less tax-equivalent adjustment			1,973
Net Interest Revenue			268,411
Provision for credit losses			—
Other operating revenue			87,856
Other operating expense			277,618
Income before taxes			78,649
Federal and state income taxes			16,197
Net income			62,452
Net income (loss) attributable to non-controlling interests			(36)
Net income attributable to BOK Financial Corp. shareholders			$	62,488
Earnings Per Average Common Share Equivalent:
Basic			$	0.91
Diluted			$	0.91

Yield calculations are shown on a tax equivalent at the statutory federal and state rates for the periods presented. The yield calculations exclude security trades that have been recorded on trade date with no corresponding interest income and the unrealized gains and losses. The yield calculation also includes average loan balances for which the accrual of interest has been discontinued and are net of unearned income. Yield / rate calculations are generally based on the conventions that determine how interest income and expense is accrued.

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Quarterly Earnings Trends – Unaudited

(In thousands, except share and per share data)

	Three Months Ended
	Mar. 31, 2023		Dec. 31, 2022		Sep. 30, 2022		June 30, 2022		Mar. 31, 2022
Interest revenue	$	516,729	$	451,606	$	363,150	$	294,247	$	283,099
Interest expense	164,381		98,980		46,825		20,229		14,688
Net interest revenue	352,348		352,626		316,325		274,018		268,411
Provision for credit losses	16,000		15,000		15,000		—		—
Net interest revenue after provision for credit losses	336,348		337,626		301,325		274,018		268,411
Other operating revenue
Brokerage and trading revenue	52,396		63,008		61,006		44,043		(27,079)
Transaction card revenue	25,621		27,136		25,974		26,940		24,216
Fiduciary and asset management revenue	50,657		49,899		50,190		49,838		46,399
Deposit service charges and fees	25,968		26,429		28,703		28,500		27,004
Mortgage banking revenue	14,367		10,065		11,282		11,368		16,650
Other revenue	16,970		17,034		15,479		12,684		10,445
Total fees and commissions	185,979		193,571		192,634		173,373		97,635
Other gains (losses), net	2,251		8,427		979		(7,639)		(1,644)
Gain (loss) on derivatives, net	(1,344)		4,548		(17,009)		(13,569)		(46,981)
Loss on fair value option securities, net	(2,962)		(2,568)		(4,368)		(2,221)		(11,201)
Change in fair value of mortgage servicing rights	(6,059)		(2,904)		16,570		17,485		49,110
Gain (loss) on available for sale securities, net	—		(3,988)		892		1,188		937
Total other operating revenue	177,865		197,086		189,698		168,617		87,856
Other operating expense
Personnel	182,145		186,419		170,348		154,923		159,228
Business promotion	8,569		7,470		6,127		6,325		6,513
Charitable contributions to BOKF Foundation	—		2,500		—		—		—
Professional fees and services	13,048		18,365		14,089		12,475		11,413
Net occupancy and equipment	28,459		29,227		29,296		27,489		30,855
Insurance	7,315		4,677		4,306		4,728		4,283
Data processing and communications	44,802		43,048		41,743		41,280		39,836
Printing, postage and supplies	3,893		3,890		4,349		3,929		3,689
Amortization of intangible assets	3,391		3,736		3,943		4,049		3,964
Mortgage banking costs	5,782		9,016		9,504		9,437		7,877
Other expense	8,408		10,108		11,046		9,020		9,960
Total other operating expense	305,812		318,456		294,751		273,655		277,618
Net income before taxes	208,401		216,256		196,272		168,980		78,649
Federal and state income taxes	45,905		47,864		39,681		36,122		16,197
Net income	162,496		168,392		156,591		132,858		62,452
Net income (loss) attributable to non-controlling interests	128		(37)		81		12		(36)
Net income attributable to BOK Financial Corporation shareholders	$	162,368	$	168,429	$	156,510	$	132,846	$	62,488
Earnings per share:
Basic	$2.43		$2.51		$2.32		$1.96		$0.91
Diluted	$2.43		$2.51		$2.32		$1.96		$0.91
Average shares used in computation:
Basic	66,331,775		66,627,955		67,003,199		67,453,748		67,812,400
Diluted	66,331,775		66,627,955		67,004,623		67,455,172		67,813,851

- 87 -

PART II. Other Information

Item 1. Legal Proceedings

See discussion of legal proceedings at Note 6 to the Consolidated Financial Statements.

Item 1A. Risk Factors

There are no material changes from the risk factors set forth under Part I, Item 1A. "Risk Factors" in the Company's Annual Report on Form 10-K for the year ended December 31, 2022, except as described below.

Recent events impacting the financial services industry could adversely affect BOK Financial's business.

Recent events affecting the financial services industry have generated significant market volatility among publicly traded bank holding companies with particular focus on regional banks. These events occurred following a period of rapidly rising interest rates, which resulted in unrealized losses in longer duration securities and loans held by banks as well as more competition for bank deposits. These recent events have, and may continue to, adversely impact the market price and volatility of the Company’s stock. Potentially adverse changes to laws or regulations governing banks and bank holding companies may occur, including but not limited to, increased regulatory scrutiny in the course of routine examinations or otherwise and new regulations directed towards banks of similar size, which could increase the costs of doing business. In addition, the cost of resolving the recent bank failures may prompt the FDIC to increase its premiums above the recently increased levels or to issue additional special assessments, which could result in higher costs.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

The following table provides information with respect to purchases made by or on behalf of the Company or any "affiliated purchaser" (as defined in Rule 10b-18(a)(3) under the Securities Exchange Act of 1934), of the Company's common stock during the three months ended March 31, 2023.

Period	Total Number of Shares Purchased2	Average Price Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs1	Maximum Number of Shares that May Yet Be Purchased Under the Plans
January 1 to January 31, 2023	109,194	$	101.08	80,550	4,605,044
February 1 to February 28, 2023	140,769	$	102.72	126,521	4,478,523
March 1 to March 31, 2023	240,000	$	96.27	240,000	4,238,523
Total	489,963			447,071

1On November 1, 2022, the Company's board of directors authorized the Company to repurchase up to five million shares of the Company's common stock. As of March 31, 2023, the Company had repurchased 761,477 shares under this plan. Future repurchases of the Company's common stock will vary based on market conditions, regulatory limitations and other factors.

2The Company may repurchase mature shares from employees to cover the exercise price and taxes in connection with employee equity compensation.

- 88 -

Item 6. Exhibits

31.1	Certification of Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
31.2	Certification of Chief Executive Officer and Chief Financial Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
32	Certification of Chief Executive Officer and Chief Financial Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
101	Interactive data files pursuant to Rule 405 of Regulation S-T: (i) the Consolidated Balance Sheets, (ii) the Consolidated Statements of Earnings, (iii) the Consolidated Statements of Changes in Equity, (iv) the Consolidated Statement of Cash Flows and (v) the Notes to Consolidated Financial Statements. The XBRL instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document.
104	Cover Page Interactive Data File - (formatted as Inline XBRL and contained in Exhibit 101)

Items 3, 4 and 5 are not applicable and have been omitted.

- 89 -

Signatures

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

BOK FINANCIAL CORPORATION

(Registrant)

Date:        May 3, 2023                                                                  

/s/ Martin E. Grunst

Martin E. Grunst

Executive Vice President and

Chief Financial Officer

/s/ Michael J. Rogers

Michael J. Rogers

Senior Vice President and

Chief Accounting Officer

- 90 -

EX-31.1

Exhibit 31.1

CERTIFICATION PURSUANT TO

SECTION 302

OF THE SARBANES-OXLEY ACT OF 2002

FOR THE CHIEF EXECUTIVE OFFICER

I, Stacy C. Kymes, President and Chief Executive Officer of BOK Financial Corporation (“BOK Financial”), certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of BOK Financial;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a.Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b.Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c.Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d.Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a.All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b.Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date:  May 3, 2023

/s/ Stacy C. Kymes

Stacy C. Kymes

President

Chief Executive Officer

BOK Financial Corporation

EX-31.2

Exhibit 31.2

CERTIFICATION PURSUANT TO

SECTION 302

OF THE SARBANES-OXLEY ACT OF 2002

FOR THE CHIEF FINANCIAL OFFICER

I, Martin E. Grunst, Chief Financial Officer of BOK Financial Corporation (“BOK Financial”), certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of BOK Financial;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a.Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b.Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a.All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date:  May 3, 2023 

/s/ Martin E. Grunst

Martin E. Grunst

Executive Vice President

Chief Financial Officer

BOK Financial Corporation

EX-32

Exhibit 32

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of BOK Financial Corporation (“BOK Financial”) on Form 10-Q for the fiscal period ending March 31, 2023 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), we, Stacy C. Kymes and Martin E. Grunst, Chief Executive Officer and Chief Financial Officer, respectively, of BOK Financial, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that to our knowledge:

1.The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2.The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of BOK Financial as of, and for, the periods presented.

May 3, 2023

/s/ Stacy C. Kymes

Stacy C. Kymes

President

Chief Executive Officer

BOK Financial Corporation

/s/ Martin E. Grunst

Martin E. Grunst

Executive Vice President

Chief Financial Officer

BOK Financial Corporation

XML

Document And Entity Information	3 Months Ended
	Mar. 31, 2023 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	66,600,833
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q1
Document Type	10-Q
Entity File Number	001-37811
Amendment Flag	false
Document Period End Date	Mar. 31, 2023
City Area Code	918
Local Phone Number	588-6000
Entity Address, Postal Zip Code	74192
Current Fiscal Year End Date	--12-31

XML

Consolidated Statements of Earnings (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Interest revenue [Abstract]
Loans	$ 367,870	$ 178,373
Residential mortgage loans held for sale	979	1,394
Trading securities	34,009	40,975
Investment securities	8,928	2,354
Available for sale securities	88,736	57,932
Fair value option securities	3,893	491
Restricted equity securities	5,808	1,107
Interest-bearing cash and cash equivalents	6,506	473
Total interest revenue	516,729	283,099
Interest expense [Abstract]
Deposits	95,274	7,598
Borrowed funds	67,038	5,788
Subordinated debentures	2,069	1,302
Total interest expense	164,381	14,688
Net interest revenue	352,348	268,411
Provision for credit losses	16,000	0
Net interest revenue after provision for credit losses	336,348	268,411
Total fees and commissions	185,979	97,635
Other gains (losses), net	2,251	(1,644)
Loss on derivatives, net	(1,344)	(46,981)
Loss on fair value option securities, net	(2,962)	(11,201)
Change in fair value of mortgage servicing rights	(6,059)	49,110
Gain on available for sale securities, net	0	937
Total other operating revenue	177,865	87,856
Other operating expense [Abstract]
Personnel	182,145	159,228
Business promotion	8,569	6,513
Professional fees and services	13,048	11,413
Net occupancy and equipment	28,459	30,855
Insurance	7,315	4,283
Data processing and communications	44,802	39,836
Printing, postage and supplies	3,893	3,689
Amortization of intangible assets	3,391	3,964
Mortgage banking costs	5,782	7,877
Other expense	8,408	9,960
Total other operating expense	305,812	277,618
Net income before taxes	208,401	78,649
Federal and state income taxes	45,905	16,197
Net income	162,496	62,452
Net income (loss) attributable to non-controlling interests	128	(36)
Net income attributable to BOK Financial Corporation shareholders	$ 162,368	$ 62,488
Earnings Per Share [Abstract]
Basic	$ 2.43	$ 0.91
Diluted	$ 2.43	$ 0.91
Average shares used in computation: [Abstract]
Basic	66,331,775	67,812,400
Diluted	66,331,775	67,813,851
Dividends declared per share	$ 0.54	$ 0.53
Brokerage and trading revenue [Member]
Total fees and commissions	$ 52,396	$ (27,079)
Transaction card revenue [Member]
Total fees and commissions	25,621	24,216
Fiduciary and asset management revenue [Member]
Total fees and commissions	50,657	46,399
Deposit service charges and fees [Member]
Total fees and commissions	25,968	27,004
Mortgage banking revenue [Member]
Total fees and commissions	14,367	16,650
Other revenue [Member]
Total fees and commissions	$ 16,970	$ 10,445

XML

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 162,496	$ 62,452
Other Comprehensive Income (Loss), before Tax [Abstract]
Net change in unrealized gain (loss)	124,045	(639,041)
Reclassification Adjustments Included in Earnings [Abstract]
Interest revenue, Investment securities	16,051	0
Gain on available for sale securities, net	0	(937)
Other comprehensive income (loss) before income taxes	140,096	(639,978)
Federal and state income taxes	31,695	(149,781)
Other comprehensive income (loss), net of income taxes	108,401	(490,197)
Comprehensive income (loss)	270,897	(427,745)
Comprehensive income (loss) attributable to non-controlling interests	128	(36)
Comprehensive income (loss) attributable to BOK Financial Corp. shareholders	$ 270,769	$ (427,709)

XML

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Assets [Abstract]
Cash and due from banks	$ 792,371	$ 943,810
Interest-bearing cash and cash equivalents	571,613	457,906
Trading securities	2,294,358	4,464,161
Investment securities, net of allowance	2,448,136	2,513,687
Available for sale securities	11,937,841	11,493,860
Fair value option securities	326,390	296,590
Restricted equity securities	288,181	299,651
Residential mortgage loans held for sale	74,175	75,272
Loans	22,750,053	22,557,150
Allowance for loan losses	(249,460)	(235,704)
Loans, net of allowance	22,500,593	22,321,446
Premises and equipment, net	623,112	565,175
Receivables	265,680	273,815
Goodwill	1,044,749	1,044,749
Intangible assets, net	72,689	76,131
Mortgage servicing rights	299,803	277,608
Real estate and other repossessed assets, net of allowance	12,651	14,304
Derivative contracts, net	394,291	880,343
Cash surrender value of bank-owned life insurance	408,614	406,751
Receivable on unsettled securities sales	18,186	31,004
Other assets	1,150,689	1,354,379
Total assets	45,524,122	47,790,642
Deposits [Abstract]
Noninterest-bearing demand deposits	11,606,975	13,395,337
Interest-bearing deposits: [Abstract]
Transaction	18,434,489	18,659,115
Savings	962,673	964,411
Time	1,576,610	1,461,842
Total deposits	32,580,747	34,480,705
Funds purchased and repurchase agreements	1,599,724	2,270,377
Other borrowings	4,735,885	4,736,908
Subordinated debentures	131,148	131,205
Accrued interest, taxes and expense	268,449	296,870
Derivative contracts, net	510,483	554,900
Due on unsettled securities purchases	262,492	147,470
Other liabilities	557,167	484,849
Total liabilities	40,646,095	43,103,284
Shareholders' equity: [Abstract]
Common stock	5	5
Capital surplus	1,397,096	1,390,395
Retained earnings	4,950,176	4,824,164
Treasury stock	(743,937)	(694,960)
Accumulated other comprehensive income (loss)	(728,554)	(836,955)
Total shareholders' equity	4,874,786	4,682,649
Non-controlling interests	3,241	4,709
Total equity	4,878,027	4,687,358
Total liabilities and equity	$ 45,524,122	$ 47,790,642

XML

Consolidated Balance Sheets (Parenthetical) (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Investment securities [Abstract]
Investment Securities, Fair Value	$ 2,307,686	$ 2,346,768
Real estate and other repossessed assets, allowance	$ (4,406)	$ (10,115)
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	(76,555,507)	(76,423,345)
Common Stock, Shares, Outstanding	(76,555,507)	(76,423,345)
Treasury stock, shares at cost (in shares)	9,954,674	9,464,711

XML

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, 2021		76,254			7,786
Balance, beginning of period at Dec. 31, 2021	$ 5,368,371	$ 5	$ 1,378,794	$ 4,447,691	$ (535,129)	$ 72,371	$ 5,363,732	$ 4,639
Net income	62,452			62,488			62,488	(36)
Other comprehensive income (loss)	(490,197)					(490,197)	(490,197)
Repurchase of common stock (in shares)					476
Repurchase of common stock	(48,074)				$ (48,074)		(48,074)
Stock options exercised (in shares)		1
Stock options exercised	37		37				37
Non-vested shares awarded, net (in shares)		157
Vesting of non-vested shares (in shares)					46
Vesting of non-vested shares	(4,944)				$ (4,944)		(4,944)
Share-based compensation	2,835		2,835				2,835
Cash dividends on common stock	(36,295)			(36,295)			(36,295)
Capital calls and distributions, net	(661)							(661)
Balance, end of period (in shares) at Mar. 31, 2022		76,412			8,308
Balance, end of period at Mar. 31, 2022	4,853,524	$ 5	1,381,666	4,473,884	$ (588,147)	(417,826)	4,849,582	3,942
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)
Stock options exercised (in shares)		0
Stock options exercised	0		0				0
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

XML

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash Flows From Operating Activities: [Abstract]
Net income	$ 162,496	$ 62,452
Adjustments to reconcile net income to net cash used in operating activities: [Abstract]
Provision for credit losses	16,000	0
Change in fair value of mortgage servicing rights due to market assumption changes	6,059	(49,110)
Change in the fair value of mortgage servicing rights due to principal payments	5,382	7,960
Net unrealized (gains) losses from derivative contracts	61,704	(31,298)
Share-based compensation	6,701	2,835
Depreciation and amortization	26,885	26,091
Net amortization of discounts and premiums	(4,163)	3,216
Net losses (gains) on financial instruments and other losses (gains), net	(2,009)	706
Net loss (gain) on mortgage loans held for sale	1,361	(1,056)
Mortgage loans originated for sale	(138,624)	(418,866)
Proceeds from sale of mortgage loans held for sale	139,088	446,742
Capitalized mortgage servicing rights	(2,498)	(5,215)
Change in trading and fair value option securities	2,140,101	4,104,453
Change in receivables	11,032	(88,559)
Change in other assets	6,721	(19,589)
Change in other liabilities	28,544	(107,508)
Net cash provided by (used in) operating activities	2,464,780	3,933,254
Cash Flows From Investing Activities: [Abstract]
Proceeds from maturities or redemptions of investment securities	64,514	26,363
Proceeds from maturities or redemptions of available for sale securities	313,935	723,730
Purchases of available for sale securities	(631,168)	(1,161,606)
Proceeds from sales of available for sale securities	0	55,185
Change in amount receivable on unsettled available for sale securities transactions	9,864	(99,944)
Loans originated, net of principal collected	(187,088)	(460,128)
Net payments on derivative asset contracts	156,522	34,855
Net change in restricted equity securities	11,470	5,724
Proceeds from disposition of assets	7,401	9,708
Purchases of assets	(58,710)	(37,569)
Net cash provided by (used in) investing activities	(313,260)	(903,682)
Cash Flows From Financing Activities: [Abstract]
Net change in demand deposits, transaction deposits and savings accounts	(2,014,726)	(1,626,196)
Net change in time deposits	114,768	(189,912)
Net change in other borrowed funds	(677,232)	(1,271,195)
Net proceeds on derivative liability contracts	(158,021)	(30,779)
Net change in derivative margin accounts	579,188	(1,274,645)
Change in amount due on unsettled available for sale securities transactions	52,104	(17,198)
Issuance of common and treasury stock, net	(4,501)	(4,907)
Repurchase of common stock	(44,476)	(48,074)
Dividends paid	(36,356)	(36,295)
Net cash provided by (used in) financing activities	(2,189,252)	(4,499,201)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total	(37,732)	(1,469,629)
Cash and cash equivalents at beginning of period	1,401,716	2,837,410
Cash and cash equivalents at end of period	1,363,984	1,367,781
Supplemental Cash Flow Information: [Abstract]
Cash paid for interest	163,960	13,982
Cash paid for taxes	733	858
Net loans and bank premises transferred to repossessed real estate and other assets	225	64
Residential mortgage loans guaranteed by U.S. government agencies that became eligible for repurchase during the period	5,556	12,568
Conveyance of other real estate owned guaranteed by U.S. government agencies	1,150	1,812
Right-of-use assets obtained in exchange for operating lease liabilities	$ 63,521	$ 9,241

XML

Significant Accounting Policies

3 Months Ended

Mar. 31, 2023

Accounting Policies [Abstract]

Significant Accounting Policies [Text Block]

Basis of Presentation

The accompanying unaudited consolidated financial statements of BOK Financial Corporation ("BOK Financial" or "the Company") 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 ("the Bank"), 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 2022 Form 10-K filed with the Securities and Exchange Commission, which contains audited financial statements. Amounts presented as of December 31, 2022 have been derived from the audited financial statements included in BOK Financial's 2022 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, 2023 are not necessarily indicative of the results that may be expected for the year ending December 31, 2023.

Newly Adopted and Pending Accounting Policies

Financial Accounting Standards Board ("FASB")

FASB Accounting Standards Update No. 2022-02, Financial Instruments - Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures ("ASU 2022-02")

On March 31, 2022, the FASB issued ASU 2022-02 which eliminates the accounting guidance on troubled debt restructurings ("TDRs") for creditors in ASC 310-40, while also no longer requiring an entity to consider renewals, modifications, and extensions that result from reasonably expected TDRs in their calculation of the allowance for credit losses. For receivables for which there has been a modification in their contractual cash flows, ASU 2022-02 requires disclosure, by class of financing receivable, of the types of modifications, the financial effects of those modifications, and the performance of these modified receivables, along with receivables that had a payment default during the current period and had modifications to the contractual cash flows within 12 months prior to the default. Further, ASU 2022-02 requires entities to disclose gross write-offs recorded in the current period by year of origination in the vintage disclosures on a year-to-date basis. ASU 2022-02 was effective for the Company January 1, 2023. Amendments related to TDR recognition and measurement and vintage disclosures were applied prospectively and are included in Note 4 to the consolidated financial statements. Adoption of this standard did not have a material effect on the Company's financial condition or results of operations.

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Securities

3 Months Ended

Mar. 31, 2023

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, 2023				December 31, 2022
	Fair Value		Net Unrealized Gain (Loss)		Fair Value		Net Unrealized Gain (Loss)
U.S. government securities	$	5,618	$	(6)	$	9,823	$	(16)
Residential agency mortgage-backed securities	2,210,721		12,289		4,406,848		4
Municipal securities	37,455		45		21,484		(136)
Asset-backed securities	10,194		10		—		—
Other trading securities	30,370		228		26,006		(175)
Total trading securities	$	2,294,358	$	12,566	$	4,464,161	$	(323)

Investment Securities

The amortized cost and fair values of investment securities are as follows (in thousands):

	March 31, 2023
	Amortized		Carrying		Fair		Gross Unrealized
	Cost		Value1		Value		Gain		Loss
Municipal securities	$	153,739	$	153,739	$	160,866	$	7,321	$	(194)
Mortgage-backed securities:
Residential agency	2,472,291		2,264,922		2,118,538		163		(146,547)
Commercial agency	17,259		15,684		14,861		—		(823)
Other debt securities	14,288		14,288		13,421		—		(867)
Total investment securities	2,657,577		2,448,633		2,307,686		7,484		(148,431)
Allowance for credit losses	(497)		(497)		—		—		—
Investment securities, net of allowance	$	2,657,080	$	2,448,136	$	2,307,686	$	7,484	$	(148,431)

1    Carrying value includes $209 million of net unrealized loss which remains in Accumulated other comprehensive income ("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 as discussed in greater detail following.

	December 31, 2022
	Amortized		Carrying		Fair		Gross Unrealized
	Cost		Value1		Value		Gain		Loss
Municipal securities	$	170,629	$	170,629	$	176,621	$	6,456	$	(464)
Mortgage-backed securities:
Residential agency	2,538,565		2,315,219		2,143,360		155		(172,014)
Commercial agency	17,259		15,609		14,588		—		(1,021)
Other debt securities	12,788		12,788		12,199		—		(589)
Total investment securities	2,739,241		2,514,245		2,346,768		6,611		(174,088)
Allowance for credit losses	(558)		(558)		—		—		—
Investment securities, net of allowance	$	2,738,683	$	2,513,687	$	2,346,768	$	6,611	$	(174,088)

1    Carrying value includes $225 million of net unrealized loss which remains in Accumulated other comprehensive income ("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 as discussed in greater detail following.

The amortized cost and fair values of investment securities at March 31, 2023, by contractual maturity, are as shown in the following table (dollars in thousands):

	Less than One Year		One to Five Years		Six to Ten Years		Over Ten Years		Total		Weighted Average Maturity1
Fixed maturity debt securities:
Carrying value	$	24,634	$	92,723	$	66,341	$	13	$	183,711	3.94
Fair value	24,917		99,241		64,977		13		189,148
Residential mortgage-backed securities:
Carrying value									$	2,264,922	2
Fair value									2,118,538
Total investment securities:
Carrying value									$	2,448,633
Fair value									2,307,686

1Expected maturities may differ from contractual maturities, because borrowers may have the right to call or prepay obligations with or without penalty.

2The average expected lives of residential mortgage-backed securities were 5.3 years years based upon current prepayment assumptions.

Temporarily Impaired Investment Securities

(dollars in thousands):

	March 31, 2023
	Number of Securities	Less Than 12 Months				12 Months or Longer				Total
		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
Investment:
Municipal securities	9	$	—	$	—	$	6,594	$	194	$	6,594	$	194
Mortgage-backed securities:
Residential agency	116	2,115,733		146,464		1,599		83		2,117,332		146,547
Commercial agency	2	14,861		823		—		—		14,861		823
Other debt securities	3	9,153		847		255		20		9,408		867
Total investment securities	130	$	2,139,747	$	148,134	$	8,448	$	297	$	2,148,195	$	148,431

	December 31, 2022
	Number of Securities	Less Than 12 Months				12 Months or Longer				Total
		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
Investment:
Municipal securities	22	$	18,037	$	406	$	544	$	58	$	18,581	$	464
Mortgage-backed securities:
Residential agency	116	2,142,114		172,014		—		—		2,142,114		172,014
Commercial agency	2	14,588		1,021		—		—		14,588		1,021
Other debt securities	3	9,428		571		257		18		9,685		589
Total investment securities	143	$	2,184,167	$	174,012	$	801	$	76	$	2,184,968	$	174,088

Available for Sale Securities 

The amortized cost and fair value of available for sale securities are as follows (in thousands):

	March 31, 2023
	Amortized		Fair		Gross Unrealized
	Cost		Value		Gain		Loss
U.S. Treasury	$	1,000	$	914	$	—	$	(86)
Municipal securities	685,963		634,207		1,338		(53,094)
Mortgage-backed securities:
Residential agency	6,311,728		6,022,708		15,379		(304,399)
Residential non-agency	690,345		651,351		11,271		(50,265)
Commercial agency	4,989,813		4,628,188		5,738		(367,363)
Other debt securities	500		473		—		(27)
Total available for sale securities	$	12,679,349	$	11,937,841	$	33,726	$	(775,234)

	December 31, 2022
	Amortized		Fair		Gross Unrealized
	Cost		Value		Gain		Loss
U.S. Treasury	$	1,000	$	898	$	—	$	(102)
Municipal securities	687,875		624,500		321		(63,696)
Mortgage-backed securities:
Residential agency	6,161,358		5,814,496		13,085		(359,947)
Residential non-agency	616,423		577,576		11,776		(50,623)
Commercial agency	4,892,257		4,475,917		3,479		(419,819)
Other debt securities	500		473		—		(27)
Total available for sale securities	$	12,359,413	$	11,493,860	$	28,661	$	(894,214)

The amortized cost and fair values of available for sale securities at March 31, 2023, by contractual maturity, are as shown in the following table (dollars in thousands):

	Less than One Year		One to Five Years		Six to Ten Years		Over Ten Years		Total		Weighted Average Maturity1
Fixed maturity debt securities:
Amortized cost	$	148,742	$	2,665,838	$	2,360,090	$	502,606	$	5,677,276	5.82
Fair value	146,996		2,510,112		2,131,783		474,891		5,263,782
Residential mortgage-backed securities:
Amortized cost									$	7,002,073	2
Fair value									6,674,059
Total available for sale securities:
Amortized cost									$	12,679,349
Fair value									11,937,841

1Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without penalty.

2The average expected lives of residential mortgage-backed securities were 4.4 years years based upon current prepayment assumptions.

Sales of available for sale securities resulted in gains and losses as follows (in thousands):

	Three Months Ended March 31,
	2023		2022
Proceeds	$	—	$	55,185
Gross realized gains	—		1,933
Gross realized losses	—		(996)
Related federal and state income tax expense	—		219

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 $9.9 billion at March 31, 2023 and $11.2 billion at December 31, 2022. 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, 2023
	Number of Securities	Less Than 12 Months				12 Months or Longer				Total
		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
Available for sale:
U.S. Treasury	1	$	—	$	—	$	914	$	86	$	914	$	86
Municipal securities	215	61,983		767		487,032		52,327		549,015		53,094
Mortgage-backed securities:
Residential agency	618	1,531,016		37,020		3,240,193		267,379		4,771,209		304,399
Residential non-agency	30	230,541		8,648		343,580		41,617		574,121		50,265
Commercial agency	288	824,751		14,313		3,413,042		353,050		4,237,793		367,363
Other debt securities	1	—		—		473		27		473		27
Total available for sale securities	1,153	$	2,648,291	$	60,748	$	7,485,234	$	714,486	$	10,133,525	$	775,234

	December 31, 2022
	Number of Securities	Less Than 12 Months				12 Months or Longer				Total
		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
Available for sale:
U.S. Treasury	1	$	—	$	—	$	899	$	102	$	899	$	102
Municipal securities	227	146,634		5,301		428,248		58,395		574,882		63,696
Mortgage-backed securities:
Residential agency	613	3,879,582		256,973		863,732		102,974		4,743,314		359,947
Residential non-agency	26	499,716		50,623		—		—		499,716		50,623
Commercial agency	285	1,647,778		63,701		2,535,816		356,118		4,183,594		419,819
Other debt securities	1	—		—		473		27		473		27
Total available for sale securities	1,153	$	6,173,710	$	376,598	$	3,829,168	$	517,616	$	10,002,878	$	894,214

Based on evaluations of impaired securities as of March 31, 2023, 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, 2023				December 31, 2022
	Fair Value		Net Unrealized Gain (Loss)		Fair Value		Net Unrealized Gain (Loss)
U.S. Treasury	$	106,307	$	359	$	—	$	—
Residential agency mortgage-backed securities	220,083		250		296,590		338
Total	$	326,390	$	609	$	296,590	$	338

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Derivatives

3 Months Ended

Mar. 31, 2023

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.

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, 2023 (in thousands):

	Assets
	Notional1		Gross Fair Value		Netting Adjustments		Net Fair Value Before Cash Collateral		Cash Collateral		Fair Value Net of Cash Collateral
Customer risk management programs:
Interest rate contracts	$	2,691,550	$	121,481	$	(3,303)	$	118,178	$	(98,143)	$	20,035
Energy contracts	7,456,604		988,149		(592,276)		395,873		(121,612)		274,261
Foreign exchange contracts	59,321		57,431		—		57,431		(1,560)		55,871
Equity option contracts	12,286		116		—		116		(95)		21
Total customer risk management programs	10,219,761		1,167,177		(595,579)		571,598		(221,410)		350,188
Trading	14,507,221		87,395		(45,420)		41,975		(1,439)		40,536
Internal risk management programs	165,207		5,253		(1,686)		3,567		—		3,567
Total derivative contracts	$	24,892,189	$	1,259,825	$	(642,685)	$	617,140	$	(222,849)	$	394,291
	Liabilities
	Notional1		Gross Fair Value		Netting Adjustments		Net Fair Value Before Cash Collateral		Cash Collateral		Fair Value Net of Cash Collateral
Customer risk management programs:
Interest rate contracts	$	2,691,550	$	121,040	$	(3,303)	$	117,737	$	—	$	117,737
Energy contracts	7,564,737		997,077		(592,276)		404,801		(80,146)		324,655
Foreign exchange contracts	57,909		55,828		—		55,828		—		55,828
Equity option contracts	12,286		116		—		116		—		116
Total customer risk management programs	10,326,482		1,174,061		(595,579)		578,482		(80,146)		498,336
Trading	16,042,176		116,109		(45,420)		70,689		(59,941)		10,748
Internal risk management programs	135,415		3,085		(1,686)		1,399		—		1,399
Total derivative contracts	$	26,504,073	$	1,293,255	$	(642,685)	$	650,570	$	(140,087)	$	510,483

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, 2022 (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	$	2,629,318	$	158,825	$	—	$	158,825	$	(114,955)	$	43,870
Energy contracts	7,918,020		1,232,283		(594,543)		637,740		(67,024)		570,716
Foreign exchange contracts	219,791		216,569		—		216,569		—		216,569
Equity option contracts	21,102		193		—		193		(109)		84
Total customer risk management programs	10,788,231		1,607,870		(594,543)		1,013,327		(182,088)		831,239
Trading	17,400,037		126,910		(74,647)		52,263		(4,646)		47,617
Internal risk management programs	85,000		1,500		(13)		1,487		—		1,487
Total derivative contracts	$	28,273,268	$	1,736,280	$	(669,203)	$	1,067,077	$	(186,734)	$	880,343
	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	$	2,629,122	$	158,816	$	—	$	158,816	$	—	$	158,816
Energy contracts	8,696,060		1,242,058		(594,543)		647,515		(484,319)		163,196
Foreign exchange contracts	214,855		211,233		—		211,233		(7)		211,226
Equity option contracts	21,102		193		—		193		—		193
Total customer risk management programs	11,561,139		1,612,300		(594,543)		1,017,757		(484,326)		533,431
Trading	14,038,906		94,958		(74,647)		20,311		(423)		19,888
Internal risk management programs	178,806		1,594		(13)		1,581		—		1,581
Total derivative contracts	$	25,778,851	$	1,708,852	$	(669,203)	$	1,039,649	$	(484,749)	$	554,900

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, 2023				March 31, 2022
	Brokerage and Trading Revenue		Gain (Loss) on Derivatives, Net		Brokerage and Trading Revenue		Gain (Loss) on Derivatives, Net
Customer risk management programs:
Interest rate contracts	$	1,770	$	—	$	6,342	$	—
Energy contracts	6,553		—		4,449		—
Foreign exchange contracts	31		—		148		—
Equity option contracts	—		—		—		—
Total customer risk management programs	8,354		—		10,939		—
Trading1	(63,093)		—		31,074		—
Internal risk management programs	—		(1,344)		—		(46,981)
Total derivative contracts	$	(54,739)	$	(1,344)	$	42,013	$	(46,981)

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.

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Loans and Allowances for Credit Losses

3 Months Ended

Mar. 31, 2023

Loans and Leases Receivable, Net Amount [Abstract]

Loans [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 is 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, 2023								December 31, 2022
	Fixed Rate		Variable Rate		Non-accrual		Total		Fixed Rate		Variable Rate		Non-accrual		Total
Commercial	$	3,427,345	$	10,735,572	$	54,432	$	14,217,349	$	3,392,422	$	10,759,780	$	60,297	$	14,212,499
Commercial real estate	879,806		3,913,842		21,668		4,815,316		874,716		3,715,491		16,570		4,606,777
Loans to individuals	2,125,020		1,548,173		44,195		3,717,388		2,099,165		1,593,779		44,930		3,737,874
Total	$	6,432,171	$	16,197,587	$	120,295	$	22,750,053	$	6,366,303	$	16,069,050	$	121,797	$	22,557,150

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, 2023, outstanding commitments totaled $15.1 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, 2023, outstanding standby letters of credit totaled $790 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 on-going evaluation of the estimated expected credit losses in the portfolio and on unused commitments to provide financing. A well-documented methodology has been developed and is applied by an independent Credit Administration department to assure consistency across the Company.

The allowance for loan losses consists of specific allowances attributed to certain individual loans, generally nonaccruing loans, with dissimilar risk characteristics that have not yet been charged down to amounts we expect to recover and general allowances for estimated credit losses on pools of loans that share similar risk characteristics.

When full collection of principal or interest is uncertain, the loan's risk characteristics have changed, and we exclude the loan from the general allowance pool, typically designating it as nonaccruing. For these loans, a specific allowance reflects the expected credit loss.

We measure specific allowances for loans excluded from the general allowance pool by an evaluation of estimated future cash flows discounted at the loan's initial effective interest rate or the fair value of collateral for certain collateral dependent loans. For a non-collateral dependent loan, the specific allowance is the amount by which the loan's amortized cost basis exceeds its net realizable value. We measure the specific allowance for collateral dependent loans as the amount by which the loan's amortized cost basis exceeds its fair value. When repayment is expected to be provided substantially through the sale of collateral, we deduct estimated selling costs from the collateral's fair value. Generally, 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 percent of the committed dollars in the loan portfolio is risk graded loans with general allowance model inputs that include probability of default, loss given default, and exposure at default. Probability of default is based on the migration of loans from performing to nonperforming using historical life of loan analysis periods. Loss given default is based on the aggregate losses incurred, net of estimated recoveries. Exposure at default represents an estimate of the outstanding amount of credit exposure at the time a default may occur.

Charge-off migration is used to calculate the general allowance for the majority of non-risk graded loans to individuals. The expected credit loss on less than 10 percent of the committed dollars in the portfolio is calculated using charge-off migration.

The expected credit loss on approximately 1 percent 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, 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

	Three Months Ended
	March 31, 2022
	Commercial		Commercial Real Estate		Loans to Individuals		Total
Allowance for loan losses:
Beginning balance	$	162,056	$	58,553	$	35,812	$	256,421
Provision for loan losses	(5,118)		468		683		(3,967)
Loans charged off	(6,081)		(191)		(1,533)		(7,805)
Recoveries of loans previously charged off	591		144		1,089		1,824
Ending balance	$	151,448	$	58,974	$	36,051	$	246,473
Allowance for off-balance sheet credit risk from unfunded loan commitments:
Beginning balance	$	13,812	$	17,442	$	1,723	$	32,977
Provision for off-balance sheet credit risk	154		3,023		91		3,268
Ending balance	$	13,966	$	20,465	$	1,814	$	36,245

A $16.0 million provision for credit losses was necessary for the first quarter of 2023, as key economic assumptions in the base case, including projected WTI oil prices and commercial real estate vacancy rates, were less favorable to economic growth.

The allowance for loan losses and recorded investment of the related loans by portfolio segment for each measurement method at March 31, 2023 is as follows (in thousands):

	Collectively Measured for General Allowances				Individually Measured for Specific Allowances				Total
	Recorded Investment		Related Allowance		Recorded Investment		Related Allowance		Recorded Investment		Related Allowance
Commercial	$	14,162,917	$	137,415	$	54,432	$	2,483	$	14,217,349	$	139,898
Commercial real estate	4,793,648		64,453		21,668		1,550		4,815,316		66,003
Loans to individuals	3,673,193		43,559		44,195		—		3,717,388		43,559
Total	$	22,629,758	$	245,427	$	120,295	$	4,033	$	22,750,053	$	249,460

The allowance for loan losses and recorded investment of the related loans by portfolio segment for each measurement method at December 31, 2022 is as follows (in thousands):

	Collectively Measured for General Allowances				Individually Measured for Specific Allowances				Total
	Recorded Investment		Related Allowance		Recorded Investment		Related Allowance		Recorded Investment		Related Allowance
Commercial	$	14,152,202	$	127,566	$	60,297	$	4,020	$	14,212,499	$	131,586
Commercial real estate	4,590,207		56,098		16,570		1,550		4,606,777		57,648
Loans to individuals	3,692,944		46,470		44,930		—		3,737,874		46,470
Total	$	22,435,353	$	230,134	$	121,797	$	5,570	$	22,557,150	$	235,704

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, 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:
Energy
Pass	$	12,973	$	146,448	$	66,052	$	8,865	$	11,301	$	11,408	$	3,119,103	$	—	$	3,376,150
Accruing Substandard	—		—		—		—		658		1,060		20,062		—		21,780
Nonaccrual	—		—		—		—		—		127		—		—		127
Total energy	12,973		146,448		66,052		8,865		11,959		12,595		3,139,165		—		3,398,057
Loans charged-off, year-to-date	—		—		—		—		—		—		—		—		—
Healthcare
Pass	175,703		876,440		615,643		479,575		386,837		1,027,229		220,992		19		3,782,438
Special Mention	—		—		204		429		21,767		45,663		60		—		68,123
Accruing Substandard	—		—		—		2,178		1,456		7,899		—		—		11,533
Nonaccrual	—		—		—		—		26,137		11,110		—		—		37,247
Total healthcare	175,703		876,440		615,847		482,182		436,197		1,091,901		221,052		19		3,899,341
Loans charged-off, year-to-date	—		—		—		—		—		—		—		—		—
Services
Pass	216,237		759,320		470,813		275,065		171,904		805,240		799,522		506		3,498,607
Special Mention	—		19,077		1,365		219		672		2,521		6,246		—		30,100
Accruing Substandard	—		397		86		—		2,232		2,599		21,499		84		26,897
Nonaccrual	—		—		5,281		376		—		—		2,441		—		8,098
Total services	216,237		778,794		477,545		275,660		174,808		810,360		829,708		590		3,563,702
Loans charged-off, year-to-date	—		—		—		—		—		—		5		—		5
General business
Pass	288,367		607,548		320,451		162,810		147,988		355,227		1,336,404		2,193		3,220,988
Special Mention	—		7,515		8,200		87		70		1,762		31,903		25		49,562
Accruing Substandard	5,516		38,443		6,841		56		4,013		7,940		13,929		—		76,738
Nonaccrual	—		—		—		1,030		14		68		7,842		7		8,961
Total general business	293,883		653,506		335,492		163,983		152,085		364,997		1,390,078		2,225		3,356,249
Loans charged-off, year-to-date	—		—		—		—		—		3		—		4		7
Total commercial	698,796		2,455,188		1,494,936		930,690		775,049		2,279,853		5,580,003		2,834		14,217,349

	Origination Year
	2023		2022		2021		2020		2019		Prior		Revolving Loans		Revolving Loans Converted to Term Loans		Total
Commercial real estate:
Pass	46,900		1,383,300		1,187,644		540,129		644,511		832,101		148,063		—		4,782,648
Special Mention	—		—		—		—		—		11,000		—		—		11,000
Nonaccrual	—		—		—		—		7,459		14,209		—		—		21,668
Total commercial real estate	46,900		1,383,300		1,187,644		540,129		651,970		857,310		148,063		—		4,815,316
Loans charged-off, year-to-date	—		—		—		—		—		2,208		—		—		2,208
Loans to individuals:
Residential mortgage
Pass	71,000		348,697		371,044		380,908		61,409		285,877		351,428		21,242		1,891,605
Special Mention	—		68		—		1,355		—		309		2,843		—		4,575
Accruing Substandard	—		—		—		—		—		7		147		—		154
Nonaccrual	—		1,184		1,738		2,851		649		20,547		1,994		730		29,693
Total residential mortgage	71,000		349,949		372,782		385,114		62,058		306,740		356,412		21,972		1,926,027
Loans charged-off, year-to-date	—		—		—		—		—		4		—		1		5
Residential mortgage guaranteed by U.S. government agencies
Pass	—		1,021		2,321		7,321		8,963		190,825		—		—		210,451
Nonaccrual	—		—		—		299		1,005		12,998		—		—		14,302
Total residential mortgage guaranteed by U.S. government agencies	—		1,021		2,321		7,620		9,968		203,823		—		—		224,753
Personal:
Pass	24,231		236,041		190,370		156,515		181,332		220,604		550,478		253		1,559,824
Special Mention	—		115		109		47		2		—		6,055		39		6,367
Accruing Substandard	—		17		40		—		160		—		—		—		217
Nonaccrual	—		69		5		10		19		19		78		—		200
Total personal	24,231		236,242		190,524		156,572		181,513		220,623		556,611		292		1,566,608
Loans charged-off, year-to-date	—		—		—		—		—		1,437		1		4		1,442
Total loans to individuals	95,231		587,212		565,627		549,306		253,539		731,186		913,023		22,264		3,717,388
Total loans	$	840,927	$	4,425,700	$	3,248,207	$	2,020,125	$	1,680,558	$	3,868,349	$	6,641,089	$	25,098	$	22,750,053

The following table summarizes the Company's loan portfolio at December 31, 2022 by the risk grade categories and vintage (in thousands): 

	Origination Year
	2022		2021		2020		2019		2018		Prior		Revolving Loans		Revolving Loans Converted to Term Loans		Total
Commercial:
Energy
Pass	$	157,745	$	76,951	$	30,284	$	12,783	$	5,992	$	4,980	$	3,104,906	$	—	$	3,393,641
Special Mention	—		—		—		—		—		—		—		—		—
Accruing Substandard	—		—		—		664		385		683		28,018		—		29,750
Nonaccrual	—		—		—		—		—		159		1,240		—		1,399
Total energy	157,745		76,951		30,284		13,447		6,377		5,822		3,134,164		—		3,424,790
Healthcare
Pass	932,097		604,886		476,854		404,204		464,989		618,163		245,898		20		3,747,111
Special Mention	—		—		—		20,071		—		18,859		4		—		38,934
Accruing Substandard	—		—		—		—		—		14,304		3,634		—		17,938
Nonaccrual	—		—		—		26,480		6,373		8,181		—		—		41,034
Total healthcare	932,097		604,886		476,854		450,755		471,362		659,507		249,536		20		3,845,017
Services
Pass	821,785		496,510		286,085		193,481		156,736		696,300		722,371		639		3,373,907
Special Mention	502		5,139		989		771		894		1,345		8,668		—		18,308
Accruing Substandard	—		—		—		2,459		43		2,789		17,665		122		23,078
Nonaccrual	—		5,570		449		—		—		2,389		7,820		—		16,228
Total services	822,287		507,219		287,523		196,711		157,673		702,823		756,524		761		3,431,521
General business
Pass	725,894		361,839		198,274		172,878		139,140		283,694		1,570,536		2,329		3,454,584
Special Mention	17,759		13,065		208		71		7		2,291		7,094		26		40,521
Accruing Substandard	—		2,169		66		4,130		4,680		3,287		94		4		14,430
Nonaccrual	—		—		1,052		14		72		5		485		8		1,636
Total general business	743,653		377,073		199,600		177,093		143,899		289,277		1,578,209		2,367		3,511,171
Total commercial	2,655,782		1,566,129		994,261		838,006		779,311		1,657,429		5,718,433		3,148		14,212,499
Commercial real estate:
Pass	1,188,483		1,158,002		552,616		641,102		247,625		633,304		161,616		—		4,582,748
Special Mention	—		—		—		—		—		—		—		—		—
Accruing Substandard	—		—		—		7,459		—		—		—		—		7,459
Nonaccrual	—		—		—		—		—		16,570		—		—		16,570
Total commercial real estate	1,188,483		1,158,002		552,616		648,561		247,625		649,874		161,616		—		4,606,777

	Origination Year
	2022		2021		2020		2019		2018		Prior		Revolving Loans		Revolving Loans Converted to Term Loans		Total
Loans to individuals:
Residential mortgage
Pass	354,497		373,190		393,002		63,142		40,525		260,625		352,126		22,176		1,859,283
Special Mention	—		81		42		—		142		388		527		87		1,267
Accruing Substandard	—		—		187		—		—		138		117		1		443
Nonaccrual	32		1,656		2,717		362		1,904		20,139		2,216		765		29,791
Total residential mortgage	354,529		374,927		395,948		63,504		42,571		281,290		354,986		23,029		1,890,784
Residential mortgage guaranteed by U.S. government agencies
Pass	289		2,254		9,000		10,722		17,244		191,426		—		—		230,935
Nonaccrual	—		—		299		1,460		2,319		10,927		—		—		15,005
Total residential mortgage guaranteed by U.S. government agencies	289		2,254		9,299		12,182		19,563		202,353		—		—		245,940
Personal:
Pass	254,497		193,095		154,887		172,114		68,871		201,278		549,187		332		1,594,261
Special Mention	47		28		40		12		17		—		6,003		4		6,151
Accruing Substandard	—		444		—		160		—		—		—		—		604
Nonaccrual	38		7		12		22		14		18		23		—		134
Total personal	254,582		193,574		154,939		172,308		68,902		201,296		555,213		336		1,601,150
Total loans to individuals	609,400		570,755		560,186		247,994		131,036		684,939		910,199		23,365		3,737,874
Total loans	$	4,453,665	$	3,294,886	$	2,107,063	$	1,734,561	$	1,157,972	$	2,992,242	$	6,790,248	$	26,513	$	22,557,150

Nonaccruing Loans

A summary of nonaccruing loans at March 31, 2023 follows (in thousands): 

	As of March 31, 2023
	Total		With No Allowance		With Allowance		Related Allowance
Commercial:
Energy	$	127	$	127	$	—	$	—
Healthcare	37,247		37,247		—		—
Services	8,097		387		7,710		2,483
General business	8,961		8,961		—		—
Total commercial	54,432		46,722		7,710		2,483
Commercial real estate	21,668		7,628		14,040		1,550
Loans to individuals:
Residential mortgage	29,693		29,693		—		—
Residential mortgage guaranteed by U.S. government agencies	14,302		14,302		—		—
Personal	200		200		—		—
Total loans to individuals	44,195		44,195		—		—
Total	$	120,295	$	98,545	$	21,750	$	4,033

A summary of nonaccruing loans at December 31, 2022 follows (in thousands): 

	As of December 31, 2022
	Total		With No Allowance		With Allowance		Related Allowance
Commercial:
Energy	$	1,399	$	1,399	$	—	$	—
Healthcare	41,034		34,661		6,373		946
Services	16,228		7,835		8,393		3,074
General business	1,636		1,636		—		—
Total commercial	60,297		45,531		14,766		4,020
Commercial real estate	16,570		393		16,177		1,550
Loans to individuals:
Residential mortgage	29,791		29,791		—		—
Residential mortgage guaranteed by U.S. government agencies	15,005		15,005		—		—
Personal	134		134		—		—
Total loans to individuals	44,930		44,930		—		—
Total	$	121,797	$	90,854	$	30,943	$	5,570

Loan Modifications to Borrowers Experiencing Financial Difficulty

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. Modifications generally consist of interest rate reductions, an other than insignificant payment delay, term extension or a combination. During the three months ended March 31, 2023, $511 thousand of residential mortgage loans guaranteed by U.S. government agencies were modified and subsequently defaulted. A payment default is defined as being 30 or more days past due after modification.

Past Due Loans

Past due status for all loan classes is based on the actual number of days since the last payment was due according to the contractual terms of the loans, as modified for short-term payment deferral forbearance.

A summary of loans currently performing and past due as of March 31, 2023 is as follows (in thousands):

			Past Due								Past Due 90 Days or More and Accruing
	Current		30 to 59 Days		60 to 89 Days		90 Days or More		Total
Commercial:
Energy	$	3,398,057	$	—	$	—	$	—	$	3,398,057	$	—
Healthcare	3,866,921		—		—		32,420		3,899,341		45
Services	3,556,753		6,844		45		60		3,563,702		—
General business	3,355,731		492		17		9		3,356,249		9
Total commercial	14,177,462		7,336		62		32,489		14,217,349		54
Commercial real estate	4,806,306		8,965		45		—		4,815,316		—
Loans to individuals:
Residential mortgage	1,910,799		8,315		363		6,550		1,926,027		22
Residential mortgage guaranteed by U.S. government agencies	103,992		48,833		—		71,928		224,753		64,980
Personal	1,565,875		567		143		23		1,566,608		—
Total loans to individuals	3,580,666		57,715		506		78,501		3,717,388		65,002
Total	$	22,564,434	$	74,016	$	613	$	110,990	$	22,750,053	$	65,056

A summary of loans currently performing and past due as of December 31, 2022 is as follows (in thousands):

			Past Due								Past Due 90 Days or More and Accruing
	Current		30 to 59 Days		60 to 89 Days		90 Days or More		Total
Commercial:
Energy	$	3,424,766	$	24	$	—	$	—	$	3,424,790	$	—
Healthcare	3,812,164		5,914		26,480		459		3,845,017		—
Services	3,423,042		1,060		2,461		4,958		3,431,521		—
General business	3,509,094		257		1,424		396		3,511,171		396
Total commercial	14,169,066		7,255		30,365		5,813		14,212,499		396
Commercial real estate	4,606,029		531		—		217		4,606,777		—
Loans to individuals:
Residential mortgage	1,872,155		10,632		1,828		6,169		1,890,784		114
Residential mortgage guaranteed by U.S. government agencies	108,019		36,119		19,400		82,402		245,940		75,604
Personal	1,600,595		502		21		32		1,601,150		—
Total loans to individuals	3,580,769		47,253		21,249		88,603		3,737,874		75,718
Total	$	22,355,864	$	55,039	$	51,614	$	94,633	$	22,557,150	$	76,114

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Mortgage Banking Activities

3 Months Ended

Mar. 31, 2023

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, 2023				December 31, 2022
	Unpaid Principal Balance/ Notional		Fair Value		Unpaid Principal Balance/ Notional		Fair Value
Residential mortgage loans held for sale	$	72,746	$	72,113	$	74,941	$	73,938
Residential mortgage loan commitments	71,693		2,694		45,492		1,054
Forward sales contracts	127,427		(632)		109,469		280
			$	74,175			$	75,272

No residential mortgage loans held for sale were 90 days or more past due or considered impaired as of March 31, 2023 or December 31, 2022. No credit losses were recognized on residential mortgage loans held for sale for the three month period ended March 31, 2023 and 2022.

Mortgage banking revenue was as follows (in thousands):

	Three Months Ended March 31,
	2023		2022
Production revenue:
Net realized gains (losses) on sale of mortgage loans	$	(1,731)	$	6,883
Net change in unrealized gain (loss) on mortgage loans held for sale	370		(5,827)
Net change in the fair value of mortgage loan commitments	1,640		(3,298)
Net change in the fair value of forward sales contracts	(912)		7,297
Total production revenue	(633)		5,055
Servicing revenue	15,000		11,595
Total mortgage banking revenue	$	14,367	$	16,650

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, 2023			December 31, 2022
Number of residential mortgage loans serviced for others	118,303			110,541
Outstanding principal balance of residential mortgage loans serviced for others	$	21,009,762		$	18,863,201
Weighted average interest rate	3.55		%	3.59		%
Remaining term (in months)	285			283

The following represents activity in capitalized mortgage servicing rights (in thousands)

	Three Months Ended March 31,
	2023		2022
Beginning Balance	$	277,608	$	163,198
Additions	2,500		5,215
Acquisitions	31,138		—
Change in fair value due to principal payments	(5,384)		(7,960)
Change in fair value due to market assumption changes	(6,059)		49,110
Ending Balance	$	299,803	$	209,563

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, 2023	December 31, 2022
Discount rate – risk-free rate plus a market premium	8.95%	9.51%
Prepayment rate - based upon loan interest rate, original term and loan type	7.43%	7.54%
Loan servicing costs – annually per loan based upon loan type:
Performing loans	$69 - $94	$69 - $94
Delinquent loans	$150 - $500	$150 - $500
Loans in foreclosure	$875 - $8,000	$875 - $8,000
Escrow earnings rate – indexed to rates paid on deposit accounts with comparable average life	3.66%	4.06%
Primary/secondary mortgage rate spread	105 bps	105 bps
Delinquency rate	1.40%	2.33%

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 Financia's servicing portfolio.

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Commitments and Contingent Liabilities

3 Months Ended

Mar. 31, 2023

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingent Liabilities [Text Block]

Commitments and Contingent Liabilities

Litigation Contingencies

On June 24, 2015, BOKF, NA received a complaint that an employee had colluded with a bond issuer and an individual in misusing revenues pledged to municipal bonds for which BOKF, NA served as trustee under the bond indenture. The Company conducted an investigation and concluded that employees in one of its Corporate Trust offices had, with respect to a single group of affiliated bond issuances, violated Company policies and procedures. The relationship manager was terminated. The Company reported the circumstances to, and cooperated with an investigation by, the Securities and Exchange Commission ("SEC"). On September 7, 2016, BOKF, NA agreed to, and the SEC entered, a consent order finding that BOKF, NA had violated Section 17(a) of the Securities Act of 1933 and Section 10(b) of the Securities Exchange Act and required BOKF, NA to disgorge $1,067,721 of fees and pay a civil penalty of $600,000. BOKF, NA disgorged the fees and paid the penalty. On August 26, 2016, BOKF, NA was sued in the United States District Court for New Jersey by two bondholders in a putative class action alleging BOKF, NA participated in the fraudulent sale of securities by the principals. The action remains stayed with no current deadlines pending. On September 14, 2016, BOKF, NA was sued in the District Court of Tulsa County, Oklahoma by 19 bondholders also alleging BOKF, NA participated in the fraudulent sale of securities by the principals. The plaintiffs' recently filed a Fourth Amended Petition to which BOKF is preparing to respond. Management is advised by counsel that, in the Tulsa County District Court action, a loss is not probable and that the loss, if any, cannot be reasonably estimated.

On December 28, 2015, in an action brought by the SEC, the New Jersey District Court entered a judgment against the principals involved in issuing the bonds. On January 8, 2020, the Court entered judgment against the principal individual and his wife for $36,805,051 in principal amount and $10,937,831 in pre-judgment interest. The SEC continues to aggressively pursue collection of the judgment. If the individual principal and his wife cannot pay the bonds, a bondholder loss could become probable. Management has been advised by counsel that BOKF, NA has valid defenses to claims of bondholders and that no loss to the Company is probable. No provision for losses has been made at this time. BOKF, NA estimates that, upon sale of all remaining collateral securing payment of the bonds, approximately $25 million in principal will remain outstanding. A reasonable estimate cannot be made of the amount of any bondholder loss, though the amount of bondholder loss could be material to the Company in the event a loss to the Company becomes probable.

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, 2023, the Company has $401 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. This investment balance also includes $94 million of unfunded commitments included in Other liabilities on the Consolidated Balance Sheets.

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Shareholders' Equity

3 Months Ended

Mar. 31, 2023

Stockholders' Equity Note [Abstract]

Shareholders' Equity [Text Block]

Shareholders' Equity

On May 2, 2023, the Company declared a quarterly cash dividend of $0.54 per common share payable on or about May 30, 2023 to shareholders of record as of May 15, 2023.

Dividends declared were $0.54 per share during the three months ended March 31, 2023 and $0.53 per share during the three months ended March 31, 2022.

Accumulated Other Comprehensive Income (Loss)

AOCI includes unrealized gains and losses on available for sale ("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		Employee Benefit Plans		Total
Balance, Dec. 31, 2021	$	69,775	$	—	$	2,596	$	72,371
Net change in unrealized gain (loss)	(639,041)		—		—		(639,041)
Reclassification adjustments included in earnings:
Gain on available for sale securities, net	(937)		—		—		(937)
Other comprehensive loss, before income taxes	(639,978)		—		—		(639,978)
Federal and state income taxes	(149,781)		—		—		(149,781)
Other comprehensive loss, net of income taxes	(490,197)		—		—		(490,197)
Balance, March 31, 2022	$	(420,422)	$	—	$	2,596	$	(417,826)
Balance, Dec. 31, 2022	$	(664,618)	$	(172,337)	$	—	$	(836,955)
Net change in unrealized gain (loss)	124,045		—		—		124,045
Interest revenue, Investment securities	—		16,051		—		16,051
Other comprehensive loss, 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)

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Earnings Per Share

3 Months Ended

Mar. 31, 2023

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,
	2023		2022
Numerator:
Net income attributable to BOK Financial Corp. shareholders	$	162,368	$	62,488
Less: Earnings allocated to participating securities	1,255		451
Numerator for basic earnings per share – income available to common shareholders	161,113		62,037
Effect of reallocating undistributed earnings of participating securities	—		—
Numerator for diluted earnings per share – income available to common shareholders	$	161,113	$	62,037
Denominator:
Weighted average shares outstanding	66,849,288		68,306,107
Less:  Participating securities included in weighted average shares outstanding	517,513		493,707
Denominator for basic earnings per common share	66,331,775		67,812,400
Dilutive effect of employee stock compensation plans	—		1,451
Denominator for diluted earnings per common share	66,331,775		67,813,851
Basic earnings per share	$	2.43	$	0.91
Diluted earnings per share	$	2.43	$	0.91

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Reportable Segments

3 Months Ended

Mar. 31, 2023

Segment Reporting [Abstract]

Reportable Segments [Text Block]

Reportable Segments

Reportable segments reconciliation to the Consolidated Financial Statements for the three months ended March 31, 2023 is as follows (in thousands):

	Commercial		Consumer		Wealth Management		Funds Management and Other		BOK Financial Consolidated
Net interest revenue from external sources	$	287,646	$	21,146	$	20,940	$	22,616	$	352,348
Net interest revenue (expense) from internal sources	(21,101)		88,235		33,166		(100,300)		—
Net interest revenue (expense)	266,545		109,381		54,106		(77,684)		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	266,469		108,197		54,130		(92,448)		336,348
Other operating revenue	56,845		30,610		108,911		(18,501)		177,865
Other operating expense	73,504		50,198		82,039		100,071		305,812
Net direct contribution	249,810		88,609		81,002		(211,020)		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	17,729		11,618		12,386		(41,733)		—
Net income (loss) before taxes	232,882		66,273		68,616		(159,370)		208,401
Federal and state income taxes	56,335		15,586		16,189		(42,205)		45,905
Net income (loss)	176,547		50,687		52,427		(117,165)		162,496
Net income attributable to non-controlling interests	—		—		—		128		128
Net income (loss) attributable to BOK Financial Corp. shareholders	$	176,547	$	50,687	$	52,427	$	(117,293)	$	162,368
Average assets	$	28,162,934	$	9,934,511	$	11,663,096	$	(3,778,073)	$	45,982,468

Reportable segments reconciliation to the Consolidated Financial Statements for the three months ended March 31, 2022 is as follows (in thousands):

	Commercial		Consumer		Wealth Management		Funds Management and Other		BOK Financial Consolidated
Net interest revenue from external sources	$	147,590	$	16,915	$	56,231	$	47,675	$	268,411
Net interest revenue (expense) from internal sources	(10,579)		10,292		(465)		752		—
Net interest revenue	137,011		27,207		55,766		48,427		268,411
Net loans charged off and provision for credit losses	5,343		1,112		(71)		(6,384)		—
Net interest revenue after provision for credit losses	131,668		26,095		55,837		54,811		268,411
Other operating revenue	57,427		33,961		25,018		(28,550)		87,856
Other operating expense	65,114		48,789		74,620		89,095		277,618
Net direct contribution	123,981		11,267		6,235		(62,834)		78,649
Gain (loss) on financial instruments, net	(204)		(57,895)		—		58,099		—
Change in fair value of mortgage servicing rights	—		49,110		—		(49,110)		—
Gain (loss) on repossessed assets, net	1,793		45		—		(1,838)		—
Corporate expense allocations	16,246		12,080		12,071		(40,397)		—
Net income before taxes	109,324		(9,553)		(5,836)		(15,286)		78,649
Federal and state income taxes	26,980		(2,236)		(1,315)		(7,232)		16,197
Net income	82,344		(7,317)		(4,521)		(8,054)		62,452
Net loss attributable to non-controlling interests	—		—		—		(36)		(36)
Net income attributable to BOK Financial Corp. shareholders	$	82,344	$	(7,317)	$	(4,521)	$	(8,018)	$	62,488
Average assets	$	29,823,905	$	10,273,890	$	21,323,795	$	(10,860,516)	$	50,561,074

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Fees and Commissions Revenue Fees and Commissions Revenue

3 Months Ended

Mar. 31, 2023

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 the Bank. 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, 2023.

	Commercial		Consumer		Wealth Management		Funds Management & Other		Consolidated		Out of Scope1		In Scope2
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	—		—		23,945		—		23,945		—		23,945
Corporate trust revenue	—		—		7,660		—		7,660		—		7,660
Institutional trust & retirement plan services revenue	—		—		12,835		—		12,835		—		12,835
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.

Fees and commissions revenue by reportable segment and primary service line is as follows for the three months ended March 31, 2022.

	Commercial		Consumer		Wealth Management		Funds Management & Other		Consolidated		Out of Scope1		In Scope2
Trading revenue	$	—	$	—	$	(54,048)	$	—	$	(54,048)	$	(54,048)	$	—
Customer hedging revenue	12,979		—		817		(2,858)		10,938		10,938		—
Retail brokerage revenue	—		—		4,610		—		4,610		—		4,610
Insurance brokerage revenue	—		—		3,738		—		3,738		—		3,738
Investment banking revenue	3,358		—		4,325		—		7,683		3,099		4,584
Brokerage and trading revenue	16,337		—		(40,558)		(2,858)		(27,079)		(40,011)		12,932
TransFund EFT network revenue	18,153		886		(17)		1		19,023		—		19,023
Merchant services revenue	3,641		10		—		—		3,651		—		3,651
Corporate card revenue	1,376		—		76		90		1,542		—		1,542
Transaction card revenue	23,170		896		59		91		24,216		—		24,216
Personal trust revenue	—		—		24,797		—		24,797		—		24,797
Corporate trust revenue	—		—		3,958		—		3,958		—		3,958
Institutional trust & retirement plan services revenue	—		—		12,567		—		12,567		—		12,567
Investment management services and other revenue	—		—		5,121		(44)		5,077		—		5,077
Fiduciary and asset management revenue	—		—		46,443		(44)		46,399		—		46,399
Commercial account service charge revenue	13,131		450		513		—		14,094		—		14,094
Overdraft fee revenue	31		6,193		23		—		6,247		—		6,247
Check card revenue	—		5,545		—		—		5,545		—		5,545
Automated service charge and other deposit fee revenue	23		1,107		(14)		2		1,118		—		1,118
Deposit service charges and fees	13,185		13,295		522		2		27,004		—		27,004
Mortgage production revenue	—		5,055		—		—		5,055		5,055		—
Mortgage servicing revenue	—		12,076		—		(481)		11,595		11,595		—
Mortgage banking revenue	—		17,131		—		(481)		16,650		16,650		—
Other revenue	4,272		2,655		18,557		(15,039)		10,445		7,275		3,170
Total fees and commissions revenue	$	56,964	$	33,977	$	25,023	$	(18,329)	$	97,635	$	(16,086)	$	113,721

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.

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Fair Value Measurements

3 Months Ended

Mar. 31, 2023

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 Compan'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, 2023 and 2022, respectively. Transfers between significant other observable inputs and significant unobservable inputs during the three months ended March 31, 2023 and 2022 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, 2023 or December 31, 2022.

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, 2023 (in thousands):

	Total		Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Trading securities:
U.S. government securities	$	5,618	$	4,878	$	740	$	—
Residential agency mortgage-backed securities	2,210,721		—		2,210,721		—
Municipal securities	37,455		—		37,455		—
Asset-backed securities	10,194		—		10,194		—
Other trading securities	30,370		—		30,370		—
Total trading securities	2,294,358		4,878		2,289,480		—
Available for sale securities:
U.S. Treasury	914		914		—		—
Municipal securities	634,207		—		634,207		—
Residential agency mortgage-backed securities	6,022,708		—		6,022,708		—
Residential non-agency mortgage-backed securities	651,351		—		651,351		—
Commercial agency mortgage-backed securities	4,628,188		—		4,628,188		—
Other debt securities	473		—		—		473
Total available for sale securities	11,937,841		914		11,936,454		473
Fair value option securities:
U.S. Treasury	106,307		106,307		—		—
Residential agency mortgage-backed securities	220,083		—		220,083		—
Total fair value option securities	326,390		106,307		220,083		—
Residential mortgage loans held for sale1	74,175		—		67,024		7,151
Mortgage servicing rights2	299,803		—		—		299,803
Derivative contracts, net of cash collateral3	394,291		303		393,988		—
Liabilities:
Derivative contracts, net of cash collateral3	510,483		3,822		506,661		—

1Residential 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 77.43% of the unpaid principal balance.

2A 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.

3See 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, 2022 (in thousands):

	Total		Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Trading securities:
U.S. government securities	$	9,823	$	4,970	$	4,853	$	—
Residential agency mortgage-backed securities	4,406,848		—		4,406,848		—
Municipal securities	21,484		—		21,484		—
Other trading securities	26,006		—		26,006		—
Total trading securities	4,464,161		4,970		4,459,191		—
Available for sale securities:
U.S. Treasury	898		898		—		—
Municipal securities	624,500		—		624,500		—
Residential agency mortgage-backed securities	5,814,496		—		5,814,496		—
Residential non-agency mortgage-backed securities	577,576		—		577,576		—
Commercial agency mortgage-backed securities	4,475,917		—		4,475,917		—
Other debt securities	473		—		—		473
Total available for sale securities	11,493,860		898		11,492,489		473
Fair value option securities — Residential agency mortgage-backed securities	296,590		—		296,590		—
Residential mortgage loans held for sale1	75,272		—		68,054		7,218
Mortgage servicing rights2	277,608		—		—		277,608
Derivative contracts, net of cash collateral3	880,343		2,110		878,233		—
Liabilities:
Derivative contracts, net of cash collateral3	554,900		16		554,884		—

1Residential 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 77.55% of the unpaid principal balance.

2A 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.

3See 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 Capital Markets, 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, 2023 for which the fair value was adjusted during the three months ended March 31, 2023:

							Fair Value Adjustments for the
	Carrying Value at March 31, 2023						Three Months Ended Mar. 31, 2023 Recognized in:
	Quoted Prices in Active Markets for Identical Instruments		Significant Other Observable Inputs		Significant Unobservable Inputs		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 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, 2022 for which the fair value was adjusted during the three months ended March 31, 2022:

							Fair Value Adjustments for the
	Carrying Value at March 31, 2022						Three Months Ended Mar. 31, 2022 Recognized in:
	Quoted Prices in Active Markets for Identical Instruments		Significant Other Observable Inputs		Significant Unobservable Inputs		Gross charge-offs against allowance for loan losses		Other gains (losses), net
Nonaccruing loans	$	—	$	4,168	$	244	$	818	$	—
Real estate and other repossessed assets	—		1,412		400		—		106

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, 2023 follows (in thousands):

	Fair Value		Valuation Technique(s)	Unobservable Input	Range (Weighted Average)
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.    

A summary of quantitative information about Non-recurring Fair Value Measurements based on Significant Unobservable Inputs (Level 3) as of March 31, 2022 follows (in thousands):

	Fair Value		Valuation Technique(s)	Unobservable Input	Range (Weighted Average)
Nonaccruing loans	$	244	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	3% - 25% (5%)1
Real estate and other repossessed assets	400		Discounted cash flows	Marketability adjustments off appraised value.2	75% - 75% (75%)

1    Represents fair value as a percentage of the unpaid principal balance.

2     Marketability adjustments include consideration of estimated costs to sell which is approximately 10% of the fair value.

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, 2023 (dollars in thousands):

	Carrying Value		Estimated Fair Value		Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash and due from banks	$	792,371	$	792,371	$	792,371	$	—	$	—
Interest-bearing cash and cash equivalents	571,613		571,613		571,613		—		—
Trading securities:
U.S. government securities	5,618		5,618		4,878		740		—
Residential agency mortgage-backed securities	2,210,721		2,210,721		—		2,210,721		—
Municipal securities	37,455		37,455		—		37,455		—
Asset-backed securities	10,194		10,194		—		10,194		—
Other trading securities	30,370		30,370		—		30,370		—
Total trading securities	2,294,358		2,294,358		4,878		2,289,480		—
Investment securities:
Municipal securities	153,739		160,866		—		33,158		127,708
Residential agency mortgage-backed securities	2,264,922		2,118,538		—		2,118,538		—
Commercial agency mortgage-backed securities	15,684		14,861		—		14,861		—
Other debt securities	14,288		13,421		—		13,421		—
Total investment securities	2,448,633		2,307,686		—		2,179,978		127,708
Allowance for credit losses	(497)		—		—		—		—
Investment securities, net of allowance	2,448,136		2,307,686		—		2,179,978		127,708
Available for sale securities:
U.S. Treasury	914		914		914		—		—
Municipal securities	634,207		634,207		—		634,207		—
Residential agency mortgage-backed securities	6,022,708		6,022,708		—		6,022,708		—
Residential non-agency mortgage-backed securities	651,351		651,351		—		651,351		—
Commercial agency mortgage-backed securities	4,628,188		4,628,188		—		4,628,188		—
Other debt securities	473		473		—		—		473
Total available for sale securities	11,937,841		11,937,841		914		11,936,454		473
Fair value option securities:
U.S. Treasury	106,307		106,307		106,307		—		—
Residential agency mortgage-backed securities	220,083		220,083		—		220,083		—
Total fair value option securities	326,390		326,390		106,307		220,083		—
Residential mortgage loans held for sale	74,175		74,175		—		67,024		7,151
Loans:
Commercial	14,217,349		14,129,311		—		—		14,129,311
Commercial real estate	4,815,316		4,703,787		—		—		4,703,787
Loans to individuals	3,717,388		3,547,326		—		—		3,547,326
Total loans	22,750,053		22,380,424		—		—		22,380,424
Allowance for loan losses	(249,460)		—		—		—		—
Loans, net of allowance	22,500,593		22,380,424		—		—		22,380,424
Mortgage servicing rights	299,803		299,803		—		—		299,803
Derivative instruments with positive fair value, net of cash collateral	394,291		394,291		303		393,988		—
Deposits with no stated maturity	31,004,137		31,004,137		—		—		31,004,137
Time deposits	1,576,610		1,547,154		—		—		1,547,154
Other borrowed funds	6,335,609		6,333,599		—		—		6,333,599
Subordinated debentures	131,148		125,077		—		125,077		—
Derivative instruments with negative fair value, net of cash collateral	510,483		510,483		3,822		506,661		—

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, 2022 (dollars in thousands):

	Carrying Value		Estimated Fair Value		Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash and due from banks	$	943,810	$	943,810	$	943,810	$	—	$	—
Interest-bearing cash and cash equivalents	457,906		457,906		457,906		—		—
Trading securities:
U.S. government securities	9,823		9,823		4,970		4,853		—
Residential agency mortgage-backed securities	4,406,848		4,406,848		—		4,406,848		—
Municipal securities	21,484		21,484		—		21,484		—
Other trading securities	26,006		26,006		—		26,006		—
Total trading securities	4,464,161		4,464,161		4,970		4,459,191		—
Investment securities:
Municipal securities	170,629		176,621		—		38,106		138,515
Residential agency mortgage-backed securities	2,315,219		2,143,360		—		2,143,360		—
Commercial agency mortgage-backed securities	15,609		14,588		—		14,588		—
Other debt securities	12,788		12,199		—		12,199		—
Total investment securities	2,514,245		2,346,768		—		2,208,253		138,515
Allowance for credit losses	(558)		—		—		—		—
Investment securities, net of allowance	2,513,687		2,346,768		—		2,208,253		138,515
Available for sale securities:
U.S. Treasury	898		898		898		—		—
Municipal securities	624,500		624,500		—		624,500		—
Residential agency mortgage-backed securities	5,814,496		5,814,496		—		5,814,496		—
Residential non-agency mortgage-backed securities	577,576		577,576		—		577,576		—
Commercial agency mortgage-backed securities	4,475,917		4,475,917		—		4,475,917		—
Other debt securities	473		473		—		—		473
Total available for sale securities	11,493,860		11,493,860		898		11,492,489		473
Fair value option securities — Residential agency mortgage-backed securities	296,590		296,590		—		296,590		—
Residential mortgage loans held for sale	75,272		75,272		—		68,054		7,218
Loans:
Commercial	14,212,499		13,905,765		—		—		13,905,765
Commercial real estate	4,606,777		4,454,048		—		—		4,454,048
Loans to individuals	3,737,874		3,531,410		—		—		3,531,410
Total loans	22,557,150		21,891,223		—		—		21,891,223
Allowance for loan losses	(235,704)		—		—		—		—
Loans, net of allowance	22,321,446		21,891,223		—		—		21,891,223
Mortgage servicing rights	277,608		277,608		—		—		277,608
Derivative instruments with positive fair value, net of cash collateral	880,343		880,343		2,110		878,233		—
Deposits with no stated maturity	33,018,863		33,018,863		—		—		33,018,863
Time deposits	1,461,842		1,431,245		—		—		1,431,245
Other borrowed funds	7,007,285		7,005,305		—		—		7,005,305
Subordinated debentures	131,205		121,497		—		121,497		—
Derivative instruments with negative fair value, net of cash collateral	554,900		554,900		16		554,884		—

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.

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Subsequent Events	3 Months Ended
	Mar. 31, 2023
Subsequent Events [Abstract]
Subsequent Events [Text Block]	Subsequent Events The Company evaluated events from the date of the consolidated financial statements on March 31, 2023 through the issuance of those consolidated financial statements included in this Quarterly Report on Form 10-Q. No events were identified requiring recognition in and/or disclosure in the consolidated financial statements.

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Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2023

Accounting Policies [Abstract]

Basis of Accounting, Policy [Policy Text Block]

The accompanying unaudited consolidated financial statements of BOK Financial Corporation ("BOK Financial" or "the Company") 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 ("the Bank"), 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")

FASB Accounting Standards Update No. 2022-02, Financial Instruments - Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures ("ASU 2022-02")

On March 31, 2022, the FASB issued ASU 2022-02 which eliminates the accounting guidance on troubled debt restructurings ("TDRs") for creditors in ASC 310-40, while also no longer requiring an entity to consider renewals, modifications, and extensions that result from reasonably expected TDRs in their calculation of the allowance for credit losses. For receivables for which there has been a modification in their contractual cash flows, ASU 2022-02 requires disclosure, by class of financing receivable, of the types of modifications, the financial effects of those modifications, and the performance of these modified receivables, along with receivables that had a payment default during the current period and had modifications to the contractual cash flows within 12 months prior to the default. Further, ASU 2022-02 requires entities to disclose gross write-offs recorded in the current period by year of origination in the vintage disclosures on a year-to-date basis. ASU 2022-02 was effective for the Company January 1, 2023. Amendments related to TDR recognition and measurement and vintage disclosures were applied prospectively and are included in Note 4 to the consolidated financial statements. Adoption of this standard did not have a material effect on the Company's financial condition or results of operations.

FASB Accounting Standards Update No. 2023-01, Leases (Topic 842): Common Control Arrangements ("ASU 2023-01")

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 is not expected to have a material impact on the Company's financial statements.

FASB Accounting Standards Update No. 2023-02, Investments - Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Tax Credit Structures Using the Proportional Amortization Method ("ASU 2023-02")

On March 29, 2023, the FASB issued ASU 2023-02 which amends previous guidance to allow entities to account for qualifying tax equity investments using the proportional amortization method regardless of the program giving rise to the related income tax credits, as opposed to only being allowed to apply this method to qualifying tax equity investments in low-income housing tax credit structures as was the case under previous guidance. ASU 2023-02 is effective for fiscal years beginning after December 15, 2023, including interim periods within those fiscal years. Adoption of ASU 2023-02 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.

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.

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 is 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.

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 on-going evaluation of the estimated expected credit losses in the portfolio and on unused commitments to provide financing. A well-documented methodology has been developed and is applied by an independent Credit Administration department to assure consistency across the Company.

The allowance for loan losses consists of specific allowances attributed to certain individual loans, generally nonaccruing loans, with dissimilar risk characteristics that have not yet been charged down to amounts we expect to recover and general allowances for estimated credit losses on pools of loans that share similar risk characteristics.

When full collection of principal or interest is uncertain, the loan's risk characteristics have changed, and we exclude the loan from the general allowance pool, typically designating it as nonaccruing. For these loans, a specific allowance reflects the expected credit loss.

We measure specific allowances for loans excluded from the general allowance pool by an evaluation of estimated future cash flows discounted at the loan's initial effective interest rate or the fair value of collateral for certain collateral dependent loans. For a non-collateral dependent loan, the specific allowance is the amount by which the loan's amortized cost basis exceeds its net realizable value. We measure the specific allowance for collateral dependent loans as the amount by which the loan's amortized cost basis exceeds its fair value. When repayment is expected to be provided substantially through the sale of collateral, we deduct estimated selling costs from the collateral's fair value. Generally, 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 percent of the committed dollars in the loan portfolio is risk graded loans with general allowance model inputs that include probability of default, loss given default, and exposure at default. Probability of default is based on the migration of loans from performing to nonperforming using historical life of loan analysis periods. Loss given default is based on the aggregate losses incurred, net of estimated recoveries. Exposure at default represents an estimate of the outstanding amount of credit exposure at the time a default may occur.

Charge-off migration is used to calculate the general allowance for the majority of non-risk graded loans to individuals. The expected credit loss on less than 10 percent of the committed dollars in the portfolio is calculated using charge-off migration.

The expected credit loss on approximately 1 percent 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.

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 the Bank. 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.

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Derivative Instruments and Hedging Activities (Policies)

3 Months Ended

Mar. 31, 2023

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.

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.

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Securities (Tables)

3 Months Ended

Mar. 31, 2023

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, 2023				December 31, 2022
	Fair Value		Net Unrealized Gain (Loss)		Fair Value		Net Unrealized Gain (Loss)
U.S. government securities	$	5,618	$	(6)	$	9,823	$	(16)
Residential agency mortgage-backed securities	2,210,721		12,289		4,406,848		4
Municipal securities	37,455		45		21,484		(136)
Asset-backed securities	10,194		10		—		—
Other trading securities	30,370		228		26,006		(175)
Total trading securities	$	2,294,358	$	12,566	$	4,464,161	$	(323)

Investment Securities (Held-to-Maturity) [Table Text Block]

The amortized cost and fair values of investment securities are as follows (in thousands):

	March 31, 2023
	Amortized		Carrying		Fair		Gross Unrealized
	Cost		Value1		Value		Gain		Loss
Municipal securities	$	153,739	$	153,739	$	160,866	$	7,321	$	(194)
Mortgage-backed securities:
Residential agency	2,472,291		2,264,922		2,118,538		163		(146,547)
Commercial agency	17,259		15,684		14,861		—		(823)
Other debt securities	14,288		14,288		13,421		—		(867)
Total investment securities	2,657,577		2,448,633		2,307,686		7,484		(148,431)
Allowance for credit losses	(497)		(497)		—		—		—
Investment securities, net of allowance	$	2,657,080	$	2,448,136	$	2,307,686	$	7,484	$	(148,431)

1    Carrying value includes $209 million of net unrealized loss which remains in Accumulated other comprehensive income ("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 as discussed in greater detail following.

	December 31, 2022
	Amortized		Carrying		Fair		Gross Unrealized
	Cost		Value1		Value		Gain		Loss
Municipal securities	$	170,629	$	170,629	$	176,621	$	6,456	$	(464)
Mortgage-backed securities:
Residential agency	2,538,565		2,315,219		2,143,360		155		(172,014)
Commercial agency	17,259		15,609		14,588		—		(1,021)
Other debt securities	12,788		12,788		12,199		—		(589)
Total investment securities	2,739,241		2,514,245		2,346,768		6,611		(174,088)
Allowance for credit losses	(558)		(558)		—		—		—
Investment securities, net of allowance	$	2,738,683	$	2,513,687	$	2,346,768	$	6,611	$	(174,088)

1    Carrying value includes $225 million of net unrealized loss which remains in Accumulated other comprehensive income ("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 as discussed in greater detail following.

The amortized cost and fair values of investment securities at March 31, 2023, by contractual maturity, are as shown in the following table (dollars in thousands):

	Less than One Year		One to Five Years		Six to Ten Years		Over Ten Years		Total		Weighted Average Maturity1
Fixed maturity debt securities:
Carrying value	$	24,634	$	92,723	$	66,341	$	13	$	183,711	3.94
Fair value	24,917		99,241		64,977		13		189,148
Residential mortgage-backed securities:
Carrying value									$	2,264,922	2
Fair value									2,118,538
Total investment securities:
Carrying value									$	2,448,633
Fair value									2,307,686

1Expected maturities may differ from contractual maturities, because borrowers may have the right to call or prepay obligations with or without penalty.

2The average expected lives of residential mortgage-backed securities were 5.3 years years based upon current prepayment assumptions.

Temporarily Impaired Investment Securities

(dollars in thousands):

	March 31, 2023
	Number of Securities	Less Than 12 Months				12 Months or Longer				Total
		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
Investment:
Municipal securities	9	$	—	$	—	$	6,594	$	194	$	6,594	$	194
Mortgage-backed securities:
Residential agency	116	2,115,733		146,464		1,599		83		2,117,332		146,547
Commercial agency	2	14,861		823		—		—		14,861		823
Other debt securities	3	9,153		847		255		20		9,408		867
Total investment securities	130	$	2,139,747	$	148,134	$	8,448	$	297	$	2,148,195	$	148,431

	December 31, 2022
	Number of Securities	Less Than 12 Months				12 Months or Longer				Total
		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
Investment:
Municipal securities	22	$	18,037	$	406	$	544	$	58	$	18,581	$	464
Mortgage-backed securities:
Residential agency	116	2,142,114		172,014		—		—		2,142,114		172,014
Commercial agency	2	14,588		1,021		—		—		14,588		1,021
Other debt securities	3	9,428		571		257		18		9,685		589
Total investment securities	143	$	2,184,167	$	174,012	$	801	$	76	$	2,184,968	$	174,088

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, 2023
	Amortized		Fair		Gross Unrealized
	Cost		Value		Gain		Loss
U.S. Treasury	$	1,000	$	914	$	—	$	(86)
Municipal securities	685,963		634,207		1,338		(53,094)
Mortgage-backed securities:
Residential agency	6,311,728		6,022,708		15,379		(304,399)
Residential non-agency	690,345		651,351		11,271		(50,265)
Commercial agency	4,989,813		4,628,188		5,738		(367,363)
Other debt securities	500		473		—		(27)
Total available for sale securities	$	12,679,349	$	11,937,841	$	33,726	$	(775,234)

	December 31, 2022
	Amortized		Fair		Gross Unrealized
	Cost		Value		Gain		Loss
U.S. Treasury	$	1,000	$	898	$	—	$	(102)
Municipal securities	687,875		624,500		321		(63,696)
Mortgage-backed securities:
Residential agency	6,161,358		5,814,496		13,085		(359,947)
Residential non-agency	616,423		577,576		11,776		(50,623)
Commercial agency	4,892,257		4,475,917		3,479		(419,819)
Other debt securities	500		473		—		(27)
Total available for sale securities	$	12,359,413	$	11,493,860	$	28,661	$	(894,214)

The amortized cost and fair values of available for sale securities at March 31, 2023, by contractual maturity, are as shown in the following table (dollars in thousands):

	Less than One Year		One to Five Years		Six to Ten Years		Over Ten Years		Total		Weighted Average Maturity1
Fixed maturity debt securities:
Amortized cost	$	148,742	$	2,665,838	$	2,360,090	$	502,606	$	5,677,276	5.82
Fair value	146,996		2,510,112		2,131,783		474,891		5,263,782
Residential mortgage-backed securities:
Amortized cost									$	7,002,073	2
Fair value									6,674,059
Total available for sale securities:
Amortized cost									$	12,679,349
Fair value									11,937,841

1Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without penalty.

2The average expected lives of residential mortgage-backed securities were 4.4 years years based upon current prepayment assumptions.

Sales of available for sale securities resulted in gains and losses as follows (in thousands):

	Three Months Ended March 31,
	2023		2022
Proceeds	$	—	$	55,185
Gross realized gains	—		1,933
Gross realized losses	—		(996)
Related federal and state income tax expense	—		219

Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table Text Block]

	March 31, 2023
	Number of Securities	Less Than 12 Months				12 Months or Longer				Total
		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
Available for sale:
U.S. Treasury	1	$	—	$	—	$	914	$	86	$	914	$	86
Municipal securities	215	61,983		767		487,032		52,327		549,015		53,094
Mortgage-backed securities:
Residential agency	618	1,531,016		37,020		3,240,193		267,379		4,771,209		304,399
Residential non-agency	30	230,541		8,648		343,580		41,617		574,121		50,265
Commercial agency	288	824,751		14,313		3,413,042		353,050		4,237,793		367,363
Other debt securities	1	—		—		473		27		473		27
Total available for sale securities	1,153	$	2,648,291	$	60,748	$	7,485,234	$	714,486	$	10,133,525	$	775,234

	December 31, 2022
	Number of Securities	Less Than 12 Months				12 Months or Longer				Total
		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
Available for sale:
U.S. Treasury	1	$	—	$	—	$	899	$	102	$	899	$	102
Municipal securities	227	146,634		5,301		428,248		58,395		574,882		63,696
Mortgage-backed securities:
Residential agency	613	3,879,582		256,973		863,732		102,974		4,743,314		359,947
Residential non-agency	26	499,716		50,623		—		—		499,716		50,623
Commercial agency	285	1,647,778		63,701		2,535,816		356,118		4,183,594		419,819
Other debt securities	1	—		—		473		27		473		27
Total available for sale securities	1,153	$	6,173,710	$	376,598	$	3,829,168	$	517,616	$	10,002,878	$	894,214

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, 2023				December 31, 2022
	Fair Value		Net Unrealized Gain (Loss)		Fair Value		Net Unrealized Gain (Loss)
U.S. Treasury	$	106,307	$	359	$	—	$	—
Residential agency mortgage-backed securities	220,083		250		296,590		338
Total	$	326,390	$	609	$	296,590	$	338

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Derivatives (Tables)

3 Months Ended

Mar. 31, 2023

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, 2023 (in thousands):

	Assets
	Notional1		Gross Fair Value		Netting Adjustments		Net Fair Value Before Cash Collateral		Cash Collateral		Fair Value Net of Cash Collateral
Customer risk management programs:
Interest rate contracts	$	2,691,550	$	121,481	$	(3,303)	$	118,178	$	(98,143)	$	20,035
Energy contracts	7,456,604		988,149		(592,276)		395,873		(121,612)		274,261
Foreign exchange contracts	59,321		57,431		—		57,431		(1,560)		55,871
Equity option contracts	12,286		116		—		116		(95)		21
Total customer risk management programs	10,219,761		1,167,177		(595,579)		571,598		(221,410)		350,188
Trading	14,507,221		87,395		(45,420)		41,975		(1,439)		40,536
Internal risk management programs	165,207		5,253		(1,686)		3,567		—		3,567
Total derivative contracts	$	24,892,189	$	1,259,825	$	(642,685)	$	617,140	$	(222,849)	$	394,291
	Liabilities
	Notional1		Gross Fair Value		Netting Adjustments		Net Fair Value Before Cash Collateral		Cash Collateral		Fair Value Net of Cash Collateral
Customer risk management programs:
Interest rate contracts	$	2,691,550	$	121,040	$	(3,303)	$	117,737	$	—	$	117,737
Energy contracts	7,564,737		997,077		(592,276)		404,801		(80,146)		324,655
Foreign exchange contracts	57,909		55,828		—		55,828		—		55,828
Equity option contracts	12,286		116		—		116		—		116
Total customer risk management programs	10,326,482		1,174,061		(595,579)		578,482		(80,146)		498,336
Trading	16,042,176		116,109		(45,420)		70,689		(59,941)		10,748
Internal risk management programs	135,415		3,085		(1,686)		1,399		—		1,399
Total derivative contracts	$	26,504,073	$	1,293,255	$	(642,685)	$	650,570	$	(140,087)	$	510,483

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, 2022 (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	$	2,629,318	$	158,825	$	—	$	158,825	$	(114,955)	$	43,870
Energy contracts	7,918,020		1,232,283		(594,543)		637,740		(67,024)		570,716
Foreign exchange contracts	219,791		216,569		—		216,569		—		216,569
Equity option contracts	21,102		193		—		193		(109)		84
Total customer risk management programs	10,788,231		1,607,870		(594,543)		1,013,327		(182,088)		831,239
Trading	17,400,037		126,910		(74,647)		52,263		(4,646)		47,617
Internal risk management programs	85,000		1,500		(13)		1,487		—		1,487
Total derivative contracts	$	28,273,268	$	1,736,280	$	(669,203)	$	1,067,077	$	(186,734)	$	880,343
	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	$	2,629,122	$	158,816	$	—	$	158,816	$	—	$	158,816
Energy contracts	8,696,060		1,242,058		(594,543)		647,515		(484,319)		163,196
Foreign exchange contracts	214,855		211,233		—		211,233		(7)		211,226
Equity option contracts	21,102		193		—		193		—		193
Total customer risk management programs	11,561,139		1,612,300		(594,543)		1,017,757		(484,326)		533,431
Trading	14,038,906		94,958		(74,647)		20,311		(423)		19,888
Internal risk management programs	178,806		1,594		(13)		1,581		—		1,581
Total derivative contracts	$	25,778,851	$	1,708,852	$	(669,203)	$	1,039,649	$	(484,749)	$	554,900

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, 2023				March 31, 2022
	Brokerage and Trading Revenue		Gain (Loss) on Derivatives, Net		Brokerage and Trading Revenue		Gain (Loss) on Derivatives, Net
Customer risk management programs:
Interest rate contracts	$	1,770	$	—	$	6,342	$	—
Energy contracts	6,553		—		4,449		—
Foreign exchange contracts	31		—		148		—
Equity option contracts	—		—		—		—
Total customer risk management programs	8,354		—		10,939		—
Trading1	(63,093)		—		31,074		—
Internal risk management programs	—		(1,344)		—		(46,981)
Total derivative contracts	$	(54,739)	$	(1,344)	$	42,013	$	(46,981)

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.

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Loans and Allowances for Credit Losses (Tables)

3 Months Ended

Mar. 31, 2023

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, 2023								December 31, 2022
	Fixed Rate		Variable Rate		Non-accrual		Total		Fixed Rate		Variable Rate		Non-accrual		Total
Commercial	$	3,427,345	$	10,735,572	$	54,432	$	14,217,349	$	3,392,422	$	10,759,780	$	60,297	$	14,212,499
Commercial real estate	879,806		3,913,842		21,668		4,815,316		874,716		3,715,491		16,570		4,606,777
Loans to individuals	2,125,020		1,548,173		44,195		3,717,388		2,099,165		1,593,779		44,930		3,737,874
Total	$	6,432,171	$	16,197,587	$	120,295	$	22,750,053	$	6,366,303	$	16,069,050	$	121,797	$	22,557,150

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, 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

	Three Months Ended
	March 31, 2022
	Commercial		Commercial Real Estate		Loans to Individuals		Total
Allowance for loan losses:
Beginning balance	$	162,056	$	58,553	$	35,812	$	256,421
Provision for loan losses	(5,118)		468		683		(3,967)
Loans charged off	(6,081)		(191)		(1,533)		(7,805)
Recoveries of loans previously charged off	591		144		1,089		1,824
Ending balance	$	151,448	$	58,974	$	36,051	$	246,473
Allowance for off-balance sheet credit risk from unfunded loan commitments:
Beginning balance	$	13,812	$	17,442	$	1,723	$	32,977
Provision for off-balance sheet credit risk	154		3,023		91		3,268
Ending balance	$	13,966	$	20,465	$	1,814	$	36,245

A $16.0 million provision for credit losses was necessary for the first quarter of 2023, as key economic assumptions in the base case, including projected WTI oil prices and commercial real estate vacancy rates, were less favorable to economic growth.

The allowance for loan losses and recorded investment of the related loans by portfolio segment for each measurement method at March 31, 2023 is as follows (in thousands):

	Collectively Measured for General Allowances				Individually Measured for Specific Allowances				Total
	Recorded Investment		Related Allowance		Recorded Investment		Related Allowance		Recorded Investment		Related Allowance
Commercial	$	14,162,917	$	137,415	$	54,432	$	2,483	$	14,217,349	$	139,898
Commercial real estate	4,793,648		64,453		21,668		1,550		4,815,316		66,003
Loans to individuals	3,673,193		43,559		44,195		—		3,717,388		43,559
Total	$	22,629,758	$	245,427	$	120,295	$	4,033	$	22,750,053	$	249,460

The allowance for loan losses and recorded investment of the related loans by portfolio segment for each measurement method at December 31, 2022 is as follows (in thousands):

	Collectively Measured for General Allowances				Individually Measured for Specific Allowances				Total
	Recorded Investment		Related Allowance		Recorded Investment		Related Allowance		Recorded Investment		Related Allowance
Commercial	$	14,152,202	$	127,566	$	60,297	$	4,020	$	14,212,499	$	131,586
Commercial real estate	4,590,207		56,098		16,570		1,550		4,606,777		57,648
Loans to individuals	3,692,944		46,470		44,930		—		3,737,874		46,470
Total	$	22,435,353	$	230,134	$	121,797	$	5,570	$	22,557,150	$	235,704

Schedule of Credit Quality Indicators [Table Text Block]

The following table summarizes the Company’s loan portfolio at March 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:
Energy
Pass	$	12,973	$	146,448	$	66,052	$	8,865	$	11,301	$	11,408	$	3,119,103	$	—	$	3,376,150
Accruing Substandard	—		—		—		—		658		1,060		20,062		—		21,780
Nonaccrual	—		—		—		—		—		127		—		—		127
Total energy	12,973		146,448		66,052		8,865		11,959		12,595		3,139,165		—		3,398,057
Loans charged-off, year-to-date	—		—		—		—		—		—		—		—		—
Healthcare
Pass	175,703		876,440		615,643		479,575		386,837		1,027,229		220,992		19		3,782,438
Special Mention	—		—		204		429		21,767		45,663		60		—		68,123
Accruing Substandard	—		—		—		2,178		1,456		7,899		—		—		11,533
Nonaccrual	—		—		—		—		26,137		11,110		—		—		37,247
Total healthcare	175,703		876,440		615,847		482,182		436,197		1,091,901		221,052		19		3,899,341
Loans charged-off, year-to-date	—		—		—		—		—		—		—		—		—
Services
Pass	216,237		759,320		470,813		275,065		171,904		805,240		799,522		506		3,498,607
Special Mention	—		19,077		1,365		219		672		2,521		6,246		—		30,100
Accruing Substandard	—		397		86		—		2,232		2,599		21,499		84		26,897
Nonaccrual	—		—		5,281		376		—		—		2,441		—		8,098
Total services	216,237		778,794		477,545		275,660		174,808		810,360		829,708		590		3,563,702
Loans charged-off, year-to-date	—		—		—		—		—		—		5		—		5
General business
Pass	288,367		607,548		320,451		162,810		147,988		355,227		1,336,404		2,193		3,220,988
Special Mention	—		7,515		8,200		87		70		1,762		31,903		25		49,562
Accruing Substandard	5,516		38,443		6,841		56		4,013		7,940		13,929		—		76,738
Nonaccrual	—		—		—		1,030		14		68		7,842		7		8,961
Total general business	293,883		653,506		335,492		163,983		152,085		364,997		1,390,078		2,225		3,356,249
Loans charged-off, year-to-date	—		—		—		—		—		3		—		4		7
Total commercial	698,796		2,455,188		1,494,936		930,690		775,049		2,279,853		5,580,003		2,834		14,217,349

	Origination Year
	2023		2022		2021		2020		2019		Prior		Revolving Loans		Revolving Loans Converted to Term Loans		Total
Commercial real estate:
Pass	46,900		1,383,300		1,187,644		540,129		644,511		832,101		148,063		—		4,782,648
Special Mention	—		—		—		—		—		11,000		—		—		11,000
Nonaccrual	—		—		—		—		7,459		14,209		—		—		21,668
Total commercial real estate	46,900		1,383,300		1,187,644		540,129		651,970		857,310		148,063		—		4,815,316
Loans charged-off, year-to-date	—		—		—		—		—		2,208		—		—		2,208
Loans to individuals:
Residential mortgage
Pass	71,000		348,697		371,044		380,908		61,409		285,877		351,428		21,242		1,891,605
Special Mention	—		68		—		1,355		—		309		2,843		—		4,575
Accruing Substandard	—		—		—		—		—		7		147		—		154
Nonaccrual	—		1,184		1,738		2,851		649		20,547		1,994		730		29,693
Total residential mortgage	71,000		349,949		372,782		385,114		62,058		306,740		356,412		21,972		1,926,027
Loans charged-off, year-to-date	—		—		—		—		—		4		—		1		5
Residential mortgage guaranteed by U.S. government agencies
Pass	—		1,021		2,321		7,321		8,963		190,825		—		—		210,451
Nonaccrual	—		—		—		299		1,005		12,998		—		—		14,302
Total residential mortgage guaranteed by U.S. government agencies	—		1,021		2,321		7,620		9,968		203,823		—		—		224,753
Personal:
Pass	24,231		236,041		190,370		156,515		181,332		220,604		550,478		253		1,559,824
Special Mention	—		115		109		47		2		—		6,055		39		6,367
Accruing Substandard	—		17		40		—		160		—		—		—		217
Nonaccrual	—		69		5		10		19		19		78		—		200
Total personal	24,231		236,242		190,524		156,572		181,513		220,623		556,611		292		1,566,608
Loans charged-off, year-to-date	—		—		—		—		—		1,437		1		4		1,442
Total loans to individuals	95,231		587,212		565,627		549,306		253,539		731,186		913,023		22,264		3,717,388
Total loans	$	840,927	$	4,425,700	$	3,248,207	$	2,020,125	$	1,680,558	$	3,868,349	$	6,641,089	$	25,098	$	22,750,053

The following table summarizes the Company's loan portfolio at December 31, 2022 by the risk grade categories and vintage (in thousands): 

	Origination Year
	2022		2021		2020		2019		2018		Prior		Revolving Loans		Revolving Loans Converted to Term Loans		Total
Commercial:
Energy
Pass	$	157,745	$	76,951	$	30,284	$	12,783	$	5,992	$	4,980	$	3,104,906	$	—	$	3,393,641
Special Mention	—		—		—		—		—		—		—		—		—
Accruing Substandard	—		—		—		664		385		683		28,018		—		29,750
Nonaccrual	—		—		—		—		—		159		1,240		—		1,399
Total energy	157,745		76,951		30,284		13,447		6,377		5,822		3,134,164		—		3,424,790
Healthcare
Pass	932,097		604,886		476,854		404,204		464,989		618,163		245,898		20		3,747,111
Special Mention	—		—		—		20,071		—		18,859		4		—		38,934
Accruing Substandard	—		—		—		—		—		14,304		3,634		—		17,938
Nonaccrual	—		—		—		26,480		6,373		8,181		—		—		41,034
Total healthcare	932,097		604,886		476,854		450,755		471,362		659,507		249,536		20		3,845,017
Services
Pass	821,785		496,510		286,085		193,481		156,736		696,300		722,371		639		3,373,907
Special Mention	502		5,139		989		771		894		1,345		8,668		—		18,308
Accruing Substandard	—		—		—		2,459		43		2,789		17,665		122		23,078
Nonaccrual	—		5,570		449		—		—		2,389		7,820		—		16,228
Total services	822,287		507,219		287,523		196,711		157,673		702,823		756,524		761		3,431,521
General business
Pass	725,894		361,839		198,274		172,878		139,140		283,694		1,570,536		2,329		3,454,584
Special Mention	17,759		13,065		208		71		7		2,291		7,094		26		40,521
Accruing Substandard	—		2,169		66		4,130		4,680		3,287		94		4		14,430
Nonaccrual	—		—		1,052		14		72		5		485		8		1,636
Total general business	743,653		377,073		199,600		177,093		143,899		289,277		1,578,209		2,367		3,511,171
Total commercial	2,655,782		1,566,129		994,261		838,006		779,311		1,657,429		5,718,433		3,148		14,212,499
Commercial real estate:
Pass	1,188,483		1,158,002		552,616		641,102		247,625		633,304		161,616		—		4,582,748
Special Mention	—		—		—		—		—		—		—		—		—
Accruing Substandard	—		—		—		7,459		—		—		—		—		7,459
Nonaccrual	—		—		—		—		—		16,570		—		—		16,570
Total commercial real estate	1,188,483		1,158,002		552,616		648,561		247,625		649,874		161,616		—		4,606,777

	Origination Year
	2022		2021		2020		2019		2018		Prior		Revolving Loans		Revolving Loans Converted to Term Loans		Total
Loans to individuals:
Residential mortgage
Pass	354,497		373,190		393,002		63,142		40,525		260,625		352,126		22,176		1,859,283
Special Mention	—		81		42		—		142		388		527		87		1,267
Accruing Substandard	—		—		187		—		—		138		117		1		443
Nonaccrual	32		1,656		2,717		362		1,904		20,139		2,216		765		29,791
Total residential mortgage	354,529		374,927		395,948		63,504		42,571		281,290		354,986		23,029		1,890,784
Residential mortgage guaranteed by U.S. government agencies
Pass	289		2,254		9,000		10,722		17,244		191,426		—		—		230,935
Nonaccrual	—		—		299		1,460		2,319		10,927		—		—		15,005
Total residential mortgage guaranteed by U.S. government agencies	289		2,254		9,299		12,182		19,563		202,353		—		—		245,940
Personal:
Pass	254,497		193,095		154,887		172,114		68,871		201,278		549,187		332		1,594,261
Special Mention	47		28		40		12		17		—		6,003		4		6,151
Accruing Substandard	—		444		—		160		—		—		—		—		604
Nonaccrual	38		7		12		22		14		18		23		—		134
Total personal	254,582		193,574		154,939		172,308		68,902		201,296		555,213		336		1,601,150
Total loans to individuals	609,400		570,755		560,186		247,994		131,036		684,939		910,199		23,365		3,737,874
Total loans	$	4,453,665	$	3,294,886	$	2,107,063	$	1,734,561	$	1,157,972	$	2,992,242	$	6,790,248	$	26,513	$	22,557,150

Financing Receivable, Nonaccrual [Table Text Block]

A summary of nonaccruing loans at March 31, 2023 follows (in thousands): 

	As of March 31, 2023
	Total		With No Allowance		With Allowance		Related Allowance
Commercial:
Energy	$	127	$	127	$	—	$	—
Healthcare	37,247		37,247		—		—
Services	8,097		387		7,710		2,483
General business	8,961		8,961		—		—
Total commercial	54,432		46,722		7,710		2,483
Commercial real estate	21,668		7,628		14,040		1,550
Loans to individuals:
Residential mortgage	29,693		29,693		—		—
Residential mortgage guaranteed by U.S. government agencies	14,302		14,302		—		—
Personal	200		200		—		—
Total loans to individuals	44,195		44,195		—		—
Total	$	120,295	$	98,545	$	21,750	$	4,033

A summary of nonaccruing loans at December 31, 2022 follows (in thousands): 

	As of December 31, 2022
	Total		With No Allowance		With Allowance		Related Allowance
Commercial:
Energy	$	1,399	$	1,399	$	—	$	—
Healthcare	41,034		34,661		6,373		946
Services	16,228		7,835		8,393		3,074
General business	1,636		1,636		—		—
Total commercial	60,297		45,531		14,766		4,020
Commercial real estate	16,570		393		16,177		1,550
Loans to individuals:
Residential mortgage	29,791		29,791		—		—
Residential mortgage guaranteed by U.S. government agencies	15,005		15,005		—		—
Personal	134		134		—		—
Total loans to individuals	44,930		44,930		—		—
Total	$	121,797	$	90,854	$	30,943	$	5,570

Summary of Loans by Aging Status [Table Text Block]

A summary of loans currently performing and past due as of March 31, 2023 is as follows (in thousands):

			Past Due								Past Due 90 Days or More and Accruing
	Current		30 to 59 Days		60 to 89 Days		90 Days or More		Total
Commercial:
Energy	$	3,398,057	$	—	$	—	$	—	$	3,398,057	$	—
Healthcare	3,866,921		—		—		32,420		3,899,341		45
Services	3,556,753		6,844		45		60		3,563,702		—
General business	3,355,731		492		17		9		3,356,249		9
Total commercial	14,177,462		7,336		62		32,489		14,217,349		54
Commercial real estate	4,806,306		8,965		45		—		4,815,316		—
Loans to individuals:
Residential mortgage	1,910,799		8,315		363		6,550		1,926,027		22
Residential mortgage guaranteed by U.S. government agencies	103,992		48,833		—		71,928		224,753		64,980
Personal	1,565,875		567		143		23		1,566,608		—
Total loans to individuals	3,580,666		57,715		506		78,501		3,717,388		65,002
Total	$	22,564,434	$	74,016	$	613	$	110,990	$	22,750,053	$	65,056

A summary of loans currently performing and past due as of December 31, 2022 is as follows (in thousands):

			Past Due								Past Due 90 Days or More and Accruing
	Current		30 to 59 Days		60 to 89 Days		90 Days or More		Total
Commercial:
Energy	$	3,424,766	$	24	$	—	$	—	$	3,424,790	$	—
Healthcare	3,812,164		5,914		26,480		459		3,845,017		—
Services	3,423,042		1,060		2,461		4,958		3,431,521		—
General business	3,509,094		257		1,424		396		3,511,171		396
Total commercial	14,169,066		7,255		30,365		5,813		14,212,499		396
Commercial real estate	4,606,029		531		—		217		4,606,777		—
Loans to individuals:
Residential mortgage	1,872,155		10,632		1,828		6,169		1,890,784		114
Residential mortgage guaranteed by U.S. government agencies	108,019		36,119		19,400		82,402		245,940		75,604
Personal	1,600,595		502		21		32		1,601,150		—
Total loans to individuals	3,580,769		47,253		21,249		88,603		3,737,874		75,718
Total	$	22,355,864	$	55,039	$	51,614	$	94,633	$	22,557,150	$	76,114

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Mortgage Banking Activities (Tables)

3 Months Ended

Mar. 31, 2023

Mortgage Banking [Abstract]

Components of Residential Mortgage Loans Held For Sale [Table Text Block]

	March 31, 2023				December 31, 2022
	Unpaid Principal Balance/ Notional		Fair Value		Unpaid Principal Balance/ Notional		Fair Value
Residential mortgage loans held for sale	$	72,746	$	72,113	$	74,941	$	73,938
Residential mortgage loan commitments	71,693		2,694		45,492		1,054
Forward sales contracts	127,427		(632)		109,469		280
			$	74,175			$	75,272

Mortgage Banking Revenue [Table Text Block]

Mortgage banking revenue was as follows (in thousands):

	Three Months Ended March 31,
	2023		2022
Production revenue:
Net realized gains (losses) on sale of mortgage loans	$	(1,731)	$	6,883
Net change in unrealized gain (loss) on mortgage loans held for sale	370		(5,827)
Net change in the fair value of mortgage loan commitments	1,640		(3,298)
Net change in the fair value of forward sales contracts	(912)		7,297
Total production revenue	(633)		5,055
Servicing revenue	15,000		11,595
Total mortgage banking revenue	$	14,367	$	16,650

Summary of Mortgage Servicing Rights [Table Text Block]

The following represents a summary of mortgage servicing rights (dollars in thousands):

	March 31, 2023			December 31, 2022
Number of residential mortgage loans serviced for others	118,303			110,541
Outstanding principal balance of residential mortgage loans serviced for others	$	21,009,762		$	18,863,201
Weighted average interest rate	3.55		%	3.59		%
Remaining term (in months)	285			283

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,
	2023		2022
Beginning Balance	$	277,608	$	163,198
Additions	2,500		5,215
Acquisitions	31,138		—
Change in fair value due to principal payments	(5,384)		(7,960)
Change in fair value due to market assumption changes	(6,059)		49,110
Ending Balance	$	299,803	$	209,563

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, 2023	December 31, 2022
Discount rate – risk-free rate plus a market premium	8.95%	9.51%
Prepayment rate - based upon loan interest rate, original term and loan type	7.43%	7.54%
Loan servicing costs – annually per loan based upon loan type:
Performing loans	$69 - $94	$69 - $94
Delinquent loans	$150 - $500	$150 - $500
Loans in foreclosure	$875 - $8,000	$875 - $8,000
Escrow earnings rate – indexed to rates paid on deposit accounts with comparable average life	3.66%	4.06%
Primary/secondary mortgage rate spread	105 bps	105 bps
Delinquency rate	1.40%	2.33%

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Shareholders' Equity (Tables)

3 Months Ended

Mar. 31, 2023

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		Employee Benefit Plans		Total
Balance, Dec. 31, 2021	$	69,775	$	—	$	2,596	$	72,371
Net change in unrealized gain (loss)	(639,041)		—		—		(639,041)
Reclassification adjustments included in earnings:
Gain on available for sale securities, net	(937)		—		—		(937)
Other comprehensive loss, before income taxes	(639,978)		—		—		(639,978)
Federal and state income taxes	(149,781)		—		—		(149,781)
Other comprehensive loss, net of income taxes	(490,197)		—		—		(490,197)
Balance, March 31, 2022	$	(420,422)	$	—	$	2,596	$	(417,826)
Balance, Dec. 31, 2022	$	(664,618)	$	(172,337)	$	—	$	(836,955)
Net change in unrealized gain (loss)	124,045		—		—		124,045
Interest revenue, Investment securities	—		16,051		—		16,051
Other comprehensive loss, 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)

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Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2023

Earnings Per Share [Abstract]

Earnings Per Share [Table Text Block]

(In thousands, except share and per share amounts)	Three Months Ended March 31,
	2023		2022
Numerator:
Net income attributable to BOK Financial Corp. shareholders	$	162,368	$	62,488
Less: Earnings allocated to participating securities	1,255		451
Numerator for basic earnings per share – income available to common shareholders	161,113		62,037
Effect of reallocating undistributed earnings of participating securities	—		—
Numerator for diluted earnings per share – income available to common shareholders	$	161,113	$	62,037
Denominator:
Weighted average shares outstanding	66,849,288		68,306,107
Less:  Participating securities included in weighted average shares outstanding	517,513		493,707
Denominator for basic earnings per common share	66,331,775		67,812,400
Dilutive effect of employee stock compensation plans	—		1,451
Denominator for diluted earnings per common share	66,331,775		67,813,851
Basic earnings per share	$	2.43	$	0.91
Diluted earnings per share	$	2.43	$	0.91

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Reportable Segments (Tables)

3 Months Ended

Mar. 31, 2023

Segment Reporting [Abstract]

Reportable Segments [Table Text Block]

Reportable segments reconciliation to the Consolidated Financial Statements for the three months ended March 31, 2023 is as follows (in thousands):

	Commercial		Consumer		Wealth Management		Funds Management and Other		BOK Financial Consolidated
Net interest revenue from external sources	$	287,646	$	21,146	$	20,940	$	22,616	$	352,348
Net interest revenue (expense) from internal sources	(21,101)		88,235		33,166		(100,300)		—
Net interest revenue (expense)	266,545		109,381		54,106		(77,684)		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	266,469		108,197		54,130		(92,448)		336,348
Other operating revenue	56,845		30,610		108,911		(18,501)		177,865
Other operating expense	73,504		50,198		82,039		100,071		305,812
Net direct contribution	249,810		88,609		81,002		(211,020)		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	17,729		11,618		12,386		(41,733)		—
Net income (loss) before taxes	232,882		66,273		68,616		(159,370)		208,401
Federal and state income taxes	56,335		15,586		16,189		(42,205)		45,905
Net income (loss)	176,547		50,687		52,427		(117,165)		162,496
Net income attributable to non-controlling interests	—		—		—		128		128
Net income (loss) attributable to BOK Financial Corp. shareholders	$	176,547	$	50,687	$	52,427	$	(117,293)	$	162,368
Average assets	$	28,162,934	$	9,934,511	$	11,663,096	$	(3,778,073)	$	45,982,468

Reportable segments reconciliation to the Consolidated Financial Statements for the three months ended March 31, 2022 is as follows (in thousands):

	Commercial		Consumer		Wealth Management		Funds Management and Other		BOK Financial Consolidated
Net interest revenue from external sources	$	147,590	$	16,915	$	56,231	$	47,675	$	268,411
Net interest revenue (expense) from internal sources	(10,579)		10,292		(465)		752		—
Net interest revenue	137,011		27,207		55,766		48,427		268,411
Net loans charged off and provision for credit losses	5,343		1,112		(71)		(6,384)		—
Net interest revenue after provision for credit losses	131,668		26,095		55,837		54,811		268,411
Other operating revenue	57,427		33,961		25,018		(28,550)		87,856
Other operating expense	65,114		48,789		74,620		89,095		277,618
Net direct contribution	123,981		11,267		6,235		(62,834)		78,649
Gain (loss) on financial instruments, net	(204)		(57,895)		—		58,099		—
Change in fair value of mortgage servicing rights	—		49,110		—		(49,110)		—
Gain (loss) on repossessed assets, net	1,793		45		—		(1,838)		—
Corporate expense allocations	16,246		12,080		12,071		(40,397)		—
Net income before taxes	109,324		(9,553)		(5,836)		(15,286)		78,649
Federal and state income taxes	26,980		(2,236)		(1,315)		(7,232)		16,197
Net income	82,344		(7,317)		(4,521)		(8,054)		62,452
Net loss attributable to non-controlling interests	—		—		—		(36)		(36)
Net income attributable to BOK Financial Corp. shareholders	$	82,344	$	(7,317)	$	(4,521)	$	(8,018)	$	62,488
Average assets	$	29,823,905	$	10,273,890	$	21,323,795	$	(10,860,516)	$	50,561,074

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Fees and Commissions Revenue Fees and Commissions Rvenue (Tables)

3 Months Ended

Mar. 31, 2023

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, 2023.

	Commercial		Consumer		Wealth Management		Funds Management & Other		Consolidated		Out of Scope1		In Scope2
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	—		—		23,945		—		23,945		—		23,945
Corporate trust revenue	—		—		7,660		—		7,660		—		7,660
Institutional trust & retirement plan services revenue	—		—		12,835		—		12,835		—		12,835
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.

Fees and commissions revenue by reportable segment and primary service line is as follows for the three months ended March 31, 2022.

	Commercial		Consumer		Wealth Management		Funds Management & Other		Consolidated		Out of Scope1		In Scope2
Trading revenue	$	—	$	—	$	(54,048)	$	—	$	(54,048)	$	(54,048)	$	—
Customer hedging revenue	12,979		—		817		(2,858)		10,938		10,938		—
Retail brokerage revenue	—		—		4,610		—		4,610		—		4,610
Insurance brokerage revenue	—		—		3,738		—		3,738		—		3,738
Investment banking revenue	3,358		—		4,325		—		7,683		3,099		4,584
Brokerage and trading revenue	16,337		—		(40,558)		(2,858)		(27,079)		(40,011)		12,932
TransFund EFT network revenue	18,153		886		(17)		1		19,023		—		19,023
Merchant services revenue	3,641		10		—		—		3,651		—		3,651
Corporate card revenue	1,376		—		76		90		1,542		—		1,542
Transaction card revenue	23,170		896		59		91		24,216		—		24,216
Personal trust revenue	—		—		24,797		—		24,797		—		24,797
Corporate trust revenue	—		—		3,958		—		3,958		—		3,958
Institutional trust & retirement plan services revenue	—		—		12,567		—		12,567		—		12,567
Investment management services and other revenue	—		—		5,121		(44)		5,077		—		5,077
Fiduciary and asset management revenue	—		—		46,443		(44)		46,399		—		46,399
Commercial account service charge revenue	13,131		450		513		—		14,094		—		14,094
Overdraft fee revenue	31		6,193		23		—		6,247		—		6,247
Check card revenue	—		5,545		—		—		5,545		—		5,545
Automated service charge and other deposit fee revenue	23		1,107		(14)		2		1,118		—		1,118
Deposit service charges and fees	13,185		13,295		522		2		27,004		—		27,004
Mortgage production revenue	—		5,055		—		—		5,055		5,055		—
Mortgage servicing revenue	—		12,076		—		(481)		11,595		11,595		—
Mortgage banking revenue	—		17,131		—		(481)		16,650		16,650		—
Other revenue	4,272		2,655		18,557		(15,039)		10,445		7,275		3,170
Total fees and commissions revenue	$	56,964	$	33,977	$	25,023	$	(18,329)	$	97,635	$	(16,086)	$	113,721

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.

XML

Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2023

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, 2023 (in thousands):

	Total		Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Trading securities:
U.S. government securities	$	5,618	$	4,878	$	740	$	—
Residential agency mortgage-backed securities	2,210,721		—		2,210,721		—
Municipal securities	37,455		—		37,455		—
Asset-backed securities	10,194		—		10,194		—
Other trading securities	30,370		—		30,370		—
Total trading securities	2,294,358		4,878		2,289,480		—
Available for sale securities:
U.S. Treasury	914		914		—		—
Municipal securities	634,207		—		634,207		—
Residential agency mortgage-backed securities	6,022,708		—		6,022,708		—
Residential non-agency mortgage-backed securities	651,351		—		651,351		—
Commercial agency mortgage-backed securities	4,628,188		—		4,628,188		—
Other debt securities	473		—		—		473
Total available for sale securities	11,937,841		914		11,936,454		473
Fair value option securities:
U.S. Treasury	106,307		106,307		—		—
Residential agency mortgage-backed securities	220,083		—		220,083		—
Total fair value option securities	326,390		106,307		220,083		—
Residential mortgage loans held for sale1	74,175		—		67,024		7,151
Mortgage servicing rights2	299,803		—		—		299,803
Derivative contracts, net of cash collateral3	394,291		303		393,988		—
Liabilities:
Derivative contracts, net of cash collateral3	510,483		3,822		506,661		—

1Residential 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 77.43% of the unpaid principal balance.

2A 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.

3See 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, 2022 (in thousands):

	Total		Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Trading securities:
U.S. government securities	$	9,823	$	4,970	$	4,853	$	—
Residential agency mortgage-backed securities	4,406,848		—		4,406,848		—
Municipal securities	21,484		—		21,484		—
Other trading securities	26,006		—		26,006		—
Total trading securities	4,464,161		4,970		4,459,191		—
Available for sale securities:
U.S. Treasury	898		898		—		—
Municipal securities	624,500		—		624,500		—
Residential agency mortgage-backed securities	5,814,496		—		5,814,496		—
Residential non-agency mortgage-backed securities	577,576		—		577,576		—
Commercial agency mortgage-backed securities	4,475,917		—		4,475,917		—
Other debt securities	473		—		—		473
Total available for sale securities	11,493,860		898		11,492,489		473
Fair value option securities — Residential agency mortgage-backed securities	296,590		—		296,590		—
Residential mortgage loans held for sale1	75,272		—		68,054		7,218
Mortgage servicing rights2	277,608		—		—		277,608
Derivative contracts, net of cash collateral3	880,343		2,110		878,233		—
Liabilities:
Derivative contracts, net of cash collateral3	554,900		16		554,884		—

1Residential 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 77.55% of the unpaid principal balance.

2A 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.

3See 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, 2023 for which the fair value was adjusted during the three months ended March 31, 2023:

							Fair Value Adjustments for the
	Carrying Value at March 31, 2023						Three Months Ended Mar. 31, 2023 Recognized in:
	Quoted Prices in Active Markets for Identical Instruments		Significant Other Observable Inputs		Significant Unobservable Inputs		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 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, 2022 for which the fair value was adjusted during the three months ended March 31, 2022:

							Fair Value Adjustments for the
	Carrying Value at March 31, 2022						Three Months Ended Mar. 31, 2022 Recognized in:
	Quoted Prices in Active Markets for Identical Instruments		Significant Other Observable Inputs		Significant Unobservable Inputs		Gross charge-offs against allowance for loan losses		Other gains (losses), net
Nonaccruing loans	$	—	$	4,168	$	244	$	818	$	—
Real estate and other repossessed assets	—		1,412		400		—		106

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, 2023 follows (in thousands):

	Fair Value		Valuation Technique(s)	Unobservable Input	Range (Weighted Average)
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.    

A summary of quantitative information about Non-recurring Fair Value Measurements based on Significant Unobservable Inputs (Level 3) as of March 31, 2022 follows (in thousands):

	Fair Value		Valuation Technique(s)	Unobservable Input	Range (Weighted Average)
Nonaccruing loans	$	244	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	3% - 25% (5%)1
Real estate and other repossessed assets	400		Discounted cash flows	Marketability adjustments off appraised value.2	75% - 75% (75%)

1    Represents fair value as a percentage of the unpaid principal balance.

2     Marketability adjustments include consideration of estimated costs to sell which is approximately 10% of the fair value.

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, 2023 (dollars in thousands):

	Carrying Value		Estimated Fair Value		Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash and due from banks	$	792,371	$	792,371	$	792,371	$	—	$	—
Interest-bearing cash and cash equivalents	571,613		571,613		571,613		—		—
Trading securities:
U.S. government securities	5,618		5,618		4,878		740		—
Residential agency mortgage-backed securities	2,210,721		2,210,721		—		2,210,721		—
Municipal securities	37,455		37,455		—		37,455		—
Asset-backed securities	10,194		10,194		—		10,194		—
Other trading securities	30,370		30,370		—		30,370		—
Total trading securities	2,294,358		2,294,358		4,878		2,289,480		—
Investment securities:
Municipal securities	153,739		160,866		—		33,158		127,708
Residential agency mortgage-backed securities	2,264,922		2,118,538		—		2,118,538		—
Commercial agency mortgage-backed securities	15,684		14,861		—		14,861		—
Other debt securities	14,288		13,421		—		13,421		—
Total investment securities	2,448,633		2,307,686		—		2,179,978		127,708
Allowance for credit losses	(497)		—		—		—		—
Investment securities, net of allowance	2,448,136		2,307,686		—		2,179,978		127,708
Available for sale securities:
U.S. Treasury	914		914		914		—		—
Municipal securities	634,207		634,207		—		634,207		—
Residential agency mortgage-backed securities	6,022,708		6,022,708		—		6,022,708		—
Residential non-agency mortgage-backed securities	651,351		651,351		—		651,351		—
Commercial agency mortgage-backed securities	4,628,188		4,628,188		—		4,628,188		—
Other debt securities	473		473		—		—		473
Total available for sale securities	11,937,841		11,937,841		914		11,936,454		473
Fair value option securities:
U.S. Treasury	106,307		106,307		106,307		—		—
Residential agency mortgage-backed securities	220,083		220,083		—		220,083		—
Total fair value option securities	326,390		326,390		106,307		220,083		—
Residential mortgage loans held for sale	74,175		74,175		—		67,024		7,151
Loans:
Commercial	14,217,349		14,129,311		—		—		14,129,311
Commercial real estate	4,815,316		4,703,787		—		—		4,703,787
Loans to individuals	3,717,388		3,547,326		—		—		3,547,326
Total loans	22,750,053		22,380,424		—		—		22,380,424
Allowance for loan losses	(249,460)		—		—		—		—
Loans, net of allowance	22,500,593		22,380,424		—		—		22,380,424
Mortgage servicing rights	299,803		299,803		—		—		299,803
Derivative instruments with positive fair value, net of cash collateral	394,291		394,291		303		393,988		—
Deposits with no stated maturity	31,004,137		31,004,137		—		—		31,004,137
Time deposits	1,576,610		1,547,154		—		—		1,547,154
Other borrowed funds	6,335,609		6,333,599		—		—		6,333,599
Subordinated debentures	131,148		125,077		—		125,077		—
Derivative instruments with negative fair value, net of cash collateral	510,483		510,483		3,822		506,661		—

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, 2022 (dollars in thousands):

	Carrying Value		Estimated Fair Value		Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash and due from banks	$	943,810	$	943,810	$	943,810	$	—	$	—
Interest-bearing cash and cash equivalents	457,906		457,906		457,906		—		—
Trading securities:
U.S. government securities	9,823		9,823		4,970		4,853		—
Residential agency mortgage-backed securities	4,406,848		4,406,848		—		4,406,848		—
Municipal securities	21,484		21,484		—		21,484		—
Other trading securities	26,006		26,006		—		26,006		—
Total trading securities	4,464,161		4,464,161		4,970		4,459,191		—
Investment securities:
Municipal securities	170,629		176,621		—		38,106		138,515
Residential agency mortgage-backed securities	2,315,219		2,143,360		—		2,143,360		—
Commercial agency mortgage-backed securities	15,609		14,588		—		14,588		—
Other debt securities	12,788		12,199		—		12,199		—
Total investment securities	2,514,245		2,346,768		—		2,208,253		138,515
Allowance for credit losses	(558)		—		—		—		—
Investment securities, net of allowance	2,513,687		2,346,768		—		2,208,253		138,515
Available for sale securities:
U.S. Treasury	898		898		898		—		—
Municipal securities	624,500		624,500		—		624,500		—
Residential agency mortgage-backed securities	5,814,496		5,814,496		—		5,814,496		—
Residential non-agency mortgage-backed securities	577,576		577,576		—		577,576		—
Commercial agency mortgage-backed securities	4,475,917		4,475,917		—		4,475,917		—
Other debt securities	473		473		—		—		473
Total available for sale securities	11,493,860		11,493,860		898		11,492,489		473
Fair value option securities — Residential agency mortgage-backed securities	296,590		296,590		—		296,590		—
Residential mortgage loans held for sale	75,272		75,272		—		68,054		7,218
Loans:
Commercial	14,212,499		13,905,765		—		—		13,905,765
Commercial real estate	4,606,777		4,454,048		—		—		4,454,048
Loans to individuals	3,737,874		3,531,410		—		—		3,531,410
Total loans	22,557,150		21,891,223		—		—		21,891,223
Allowance for loan losses	(235,704)		—		—		—		—
Loans, net of allowance	22,321,446		21,891,223		—		—		21,891,223
Mortgage servicing rights	277,608		277,608		—		—		277,608
Derivative instruments with positive fair value, net of cash collateral	880,343		880,343		2,110		878,233		—
Deposits with no stated maturity	33,018,863		33,018,863		—		—		33,018,863
Time deposits	1,461,842		1,431,245		—		—		1,431,245
Other borrowed funds	7,007,285		7,005,305		—		—		7,005,305
Subordinated debentures	131,205		121,497		—		121,497		—
Derivative instruments with negative fair value, net of cash collateral	554,900		554,900		16		554,884		—

XML

Significant Accounting Policies Loans and Allowance for Credit Losses (Details)	3 Months Ended
	Mar. 31, 2023
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

XML

Trading Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Schedule of Trading Securities [Line Items]
Trading securities	$ 2,294,358	$ 4,464,161
Trading Securities, Net Unrealized Gain (Loss)	12,566	(323)
U.S. government securities [Member]
Schedule of Trading Securities [Line Items]
Trading securities	5,618	9,823
Trading Securities, Net Unrealized Gain (Loss)	(6)	(16)
Residential agency mortgage-backed securities [Member]
Schedule of Trading Securities [Line Items]
Trading securities	2,210,721	4,406,848
Trading Securities, Net Unrealized Gain (Loss)	12,289	4
Municipal securities [Member]
Schedule of Trading Securities [Line Items]
Trading securities	37,455	21,484
Trading Securities, Net Unrealized Gain (Loss)	45	(136)
Asset-backed securities [Member]
Schedule of Trading Securities [Line Items]
Trading securities	10,194	0
Trading Securities, Net Unrealized Gain (Loss)	10	0
Other trading securities [Member]
Schedule of Trading Securities [Line Items]
Trading securities	30,370	26,006
Trading Securities, Net Unrealized Gain (Loss)	$ 228	$ (175)

XML

Investment (Held-to-Maturity) Securities (Details) $ in Thousands		3 Months Ended		12 Months Ended
		Mar. 31, 2023 USD ($)		Dec. 31, 2022 USD ($)
Schedule of Investment (Held-to-Maturity) Securities [Line Items]
Investment Securities, Gross Amortized Cost		$ 2,657,577		$ 2,739,241
Investment Securities, Gross Carrying Value		2,448,633	[1]	2,514,245	[2]
Investment securities, Allowance for Credit Loss		(497)	[1]	(558)	[2]
Investment Securities, Amortized Cost, After Allowance for Credit Loss		2,657,080		2,738,683
Investment Securities, Carrying Value, after Allowance for Credit Loss		2,448,136	[1]	2,513,687	[2]
Investment Securities, Fair Value		2,307,686		2,346,768
Investment Securities, Gross Unrealized Gain		7,484		6,611
Investment Securities, Gross Unrealized Loss		(148,431)		(174,088)
Debt Securities, Net Unrealized Loss Remaining in AOCI included in Carrying Value for AFS Securities Transferred to Investment Securities		$ (209,000)		$ (225,000)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions		130		143
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		$ 2,139,747		$ 2,184,167
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		8,448		801
Investment Securities, Continuous Unrealized Loss Position, Fair Value		2,148,195		2,184,968
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		148,134		174,012
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		297		76
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss		148,431		174,088
Fixed Maturity Securities [Member]
Investment Securities, Debt Maturities, Net Carrying Value [Abstract]
Investment Securities, Debt Maturities, Less than One Year, Net Carrying Value		24,634
Investment Securities, Debt Maturities, One to Five Years, Net Carrying Value		92,723
Investment Securities, Debt Maturities, Six to Ten Years, Net Carrying Value		66,341
Investment Securities, Debt Maturities, Over Ten Years, Net Carrying Value		13
Investment Securities, Debt Maturities, Single Maturity Date, Net Carrying Value		183,711
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]
Investment Securities, Debt Maturities, Less Than One Year, Fair Value		24,917
Investment Securities, Debt Maturities, One to Five Years, Fair Value		99,241
Investment Securities, Debt Maturities, Six to Ten Years, Fair Value		64,977
Investment Securities, Debt Maturities, Over Ten Years, Fair Value		13
Investment Securities, Debt Maturities, Single Maturity Date, Fair Value		$ 189,148
Investment Securities, Debt Maturities, Weighted Average Maturity	[3]	3.94
Municipal securities [Member]
Schedule of Investment (Held-to-Maturity) Securities [Line Items]
Investment Securities, Gross Amortized Cost		$ 153,739		170,629
Investment Securities, Gross Carrying Value		153,739	[1]	170,629	[2]
Investment Securities, Fair Value		160,866		176,621
Investment Securities, Gross Unrealized Gain		7,321		6,456
Investment Securities, Gross Unrealized Loss		$ (194)		$ (464)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions		9		22
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		$ 0		$ 18,037
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		6,594		544
Investment Securities, Continuous Unrealized Loss Position, Fair Value		6,594		18,581
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		0		406
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		194		58
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss		194		464
Residential agency mortgage-backed securities [Member]
Schedule of Investment (Held-to-Maturity) Securities [Line Items]
Investment Securities, Gross Amortized Cost		2,472,291		2,538,565
Investment Securities, Gross Carrying Value		2,264,922	[1]	2,315,219	[2]
Investment Securities, Fair Value		2,118,538		2,143,360
Investment Securities, Gross Unrealized Gain		163		155
Investment Securities, Gross Unrealized Loss		(146,547)		$ (172,014)
Investment Securities, Debt Maturities, Net Carrying Value [Abstract]
Investment Securities, Debt Maturities, without Single Maturity Date, Net Carrying Value	[4]	2,264,922
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]
Investment Securities, Debt Maturities, without Single Maturity Date, Fair Value		$ 2,118,538
Investment Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities		5 years 3 months 18 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		$ 2,115,733		$ 2,142,114
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		1,599		0
Investment Securities, Continuous Unrealized Loss Position, Fair Value		2,117,332		2,142,114
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		146,464		172,014
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		83		0
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss		146,547		172,014
Commercial agency mortgage-backed securities [Member]
Schedule of Investment (Held-to-Maturity) Securities [Line Items]
Investment Securities, Gross Amortized Cost		17,259		17,259
Investment Securities, Gross Carrying Value		15,684	[1]	15,609	[2]
Investment Securities, Fair Value		14,861		14,588
Investment Securities, Gross Unrealized Gain		0		0
Investment Securities, Gross Unrealized Loss		$ (823)		$ (1,021)
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		$ 14,861		$ 14,588
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		0		0
Investment Securities, Continuous Unrealized Loss Position, Fair Value		14,861		14,588
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		823		1,021
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		0		0
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss		823		1,021
Other debt securities [Member]
Schedule of Investment (Held-to-Maturity) Securities [Line Items]
Investment Securities, Gross Amortized Cost		14,288		12,788
Investment Securities, Gross Carrying Value		14,288	[1]	12,788	[2]
Investment Securities, Fair Value		13,421		12,199
Investment Securities, Gross Unrealized Gain		0		0
Investment Securities, Gross Unrealized Loss		$ (867)		$ (589)
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		$ 9,153		$ 9,428
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		255		257
Investment Securities, Continuous Unrealized Loss Position, Fair Value		9,408		9,685
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		847		571
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		20		18
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss		$ 867		$ 589

[1] Carrying value includes $209 million of net unrealized loss which remains in Accumulated other comprehensive income ("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 as discussed in greater detail following.

[2] Carrying value includes $225 million of net unrealized loss which remains in Accumulated other comprehensive income ("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 as discussed in greater detail following.

[3] Expected maturities may differ from contractual maturities, because borrowers may have the right to call or prepay obligations with or without penalty.

[4] The average expected lives of residential mortgage-backed securities were 5.3 years years based upon current prepayment assumptions.

XML

Available for Sale Securities (Details) $ in Thousands		3 Months Ended
		Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Amortized Cost		$ 12,679,349		$ 12,359,413
Available-for-sale Securities, Fair Value		11,937,841		11,493,860
Available-for-sale Securities, Gross Unrealized Gain		33,726		28,661
Available-for-sale Securities, Gross Unrealized Loss		(775,234)		$ (894,214)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]
Available-for-sale Securities, Proceeds		0	$ 55,185
Available-for-sale Securities, Gross realized gains		0	1,933
Available-for-sale Securities, Gross realized losses		0	(996)
Available-for-sale Securities, Related federal and state income tax expense (benefit)		$ 0	$ 219
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions		1,153		1,153
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		$ 2,648,291		$ 6,173,710
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		60,748		376,598
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		7,485,234		3,829,168
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		714,486		517,616
Debt Securities, Available-for-sale, Unrealized Loss Position		10,133,525		10,002,878
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		775,234		894,214
Asset Pledged as Collateral with Right
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]
Pledged Securities		9,900,000		11,200,000
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		148,742
Available-for-sale Securities, Debt Maturities, One to Five Years, Amortized Cost Basis		2,665,838
Available-for-sale Securities, Debt Maturities, Six To Ten Years, Amortized Cost Basis		2,360,090
Available-for-sale Securities, Debt Maturities, Over Ten Years, Amortized Cost Basis		502,606
Available-for-sale Securities, Debt Maturities, Allocated and Single Maturity Date, Amortized Cost		5,677,276
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]
Available-for-sale Securities, Debt Maturities, Less than One Year, Fair Value		146,996
Available-for-sale Securities, Debt Maturities, One to Five Years, Fair Value		2,510,112
Available-for-sale Securities, Debt Maturities, Six to Ten Years, Fair Value		2,131,783
Available-for-sale Securities, Debt Maturities, Over Ten Years, Fair Value		474,891
Available-for-sale Securities, Debt Maturities, Allocated and Single Maturity Date, Fair Value		$ 5,263,782
Available-for-sale Securities, Debt Maturities, Weighted Average Maturity	[1]	5.82
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		914		898
Available-for-sale Securities, Gross Unrealized Gain		0		0
Available-for-sale Securities, Gross Unrealized Loss		$ (86)		$ (102)
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		914		899
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		86		102
Debt Securities, Available-for-sale, Unrealized Loss Position		914		899
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		86		102
Municipal securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Amortized Cost		685,963		687,875
Available-for-sale Securities, Fair Value		634,207		624,500
Available-for-sale Securities, Gross Unrealized Gain		1,338		321
Available-for-sale Securities, Gross Unrealized Loss		$ (53,094)		$ (63,696)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions		215		227
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		$ 61,983		$ 146,634
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		767		5,301
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		487,032		428,248
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		52,327		58,395
Debt Securities, Available-for-sale, Unrealized Loss Position		549,015		574,882
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		53,094		63,696
Commercial agency mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Amortized Cost		4,989,813		4,892,257
Available-for-sale Securities, Fair Value		4,628,188		4,475,917
Available-for-sale Securities, Gross Unrealized Gain		5,738		3,479
Available-for-sale Securities, Gross Unrealized Loss		$ (367,363)		$ (419,819)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions		288		285
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		$ 824,751		$ 1,647,778
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		14,313		63,701
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		3,413,042		2,535,816
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		353,050		356,118
Debt Securities, Available-for-sale, Unrealized Loss Position		4,237,793		4,183,594
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		367,363		419,819
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]	7,002,073
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value		$ 6,674,059
Available-for-sale Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities		4 years 4 months 24 days
Residential agency mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Amortized Cost		$ 6,311,728		6,161,358
Available-for-sale Securities, Fair Value		6,022,708		5,814,496
Available-for-sale Securities, Gross Unrealized Gain		15,379		13,085
Available-for-sale Securities, Gross Unrealized Loss		$ (304,399)		$ (359,947)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions		618		613
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		$ 1,531,016		$ 3,879,582
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		37,020		256,973
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		3,240,193		863,732
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		267,379		102,974
Debt Securities, Available-for-sale, Unrealized Loss Position		4,771,209		4,743,314
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		304,399		359,947
Residential non-agency mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Amortized Cost		690,345		616,423
Available-for-sale Securities, Fair Value		651,351		577,576
Available-for-sale Securities, Gross Unrealized Gain		11,271		11,776
Available-for-sale Securities, Gross Unrealized Loss		$ (50,265)		$ (50,623)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions		30		26
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		$ 230,541		$ 499,716
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		8,648		50,623
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		343,580		0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		41,617		0
Debt Securities, Available-for-sale, Unrealized Loss Position		574,121		499,716
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		$ 50,265		$ 50,623

[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 4.4 years years based upon current prepayment assumptions.

XML

Securities Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value (Details) $ in Thousands	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	1,153	1,153
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 2,648,291	$ 6,173,710
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	7,485,234	3,829,168
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	10,133,525	10,002,878
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	60,748	376,598
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	714,486	517,616
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 775,234	$ 894,214
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	914	899
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	914	899
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	86	102
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 86	$ 102
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	215	227
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 61,983	$ 146,634
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	487,032	428,248
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	549,015	574,882
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	767	5,301
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	52,327	58,395
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 53,094	$ 63,696
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	618	613
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 1,531,016	$ 3,879,582
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	3,240,193	863,732
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	4,771,209	4,743,314
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	37,020	256,973
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	267,379	102,974
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 304,399	$ 359,947
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	30	26
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 230,541	$ 499,716
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	343,580	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	574,121	499,716
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	8,648	50,623
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	41,617	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 50,265	$ 50,623
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	288	285
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 824,751	$ 1,647,778
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	3,413,042	2,535,816
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	4,237,793	4,183,594
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	14,313	63,701
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	353,050	356,118
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 367,363	$ 419,819
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

XML

Securities Fair Value Option Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Fair Value Option Securities [Line Items]
Fair value option securities, Fair Value	$ 326,390	$ 296,590
Fair value option securities, Net Unrealized Gain (Loss)	609	338
U.S. Treasury [Member]
Fair Value Option Securities [Line Items]
Fair value option securities, Fair Value	106,307	0
Fair value option securities, Net Unrealized Gain (Loss)	359	0
Residential agency mortgage-backed securities [Member]
Fair Value Option Securities [Line Items]
Fair value option securities, Fair Value	220,083	296,590
Fair value option securities, Net Unrealized Gain (Loss)	$ 250	$ 338

XML

Derivatives, Fair Value of Derivatives Contracts (Details) - USD ($) $ in Thousands	Mar. 31, 2023		Dec. 31, 2022
Derivative Assets, Fair Value, Net [Abstract]
Derviative contracts, net of cash collateral, Assets, Fair value	$ 394,291		$ 880,343
Derivative Liabilities, Fair Value, Net [Abstract]
Derivative Liabilities, Fair Value, Net of Cash Collateral	510,483		554,900
Not Designated as Hedging Instrument [Member]
Notional Amount of Derivatives [Abstract]
Derivative Assets, Notional	24,892,189	[1]	28,273,268	[2]
Derivative Liabilities, Notional	26,504,073	[1]	25,778,851	[2]
Derivative Assets, Fair Value, Net [Abstract]
Derivative Assets, Gross Fair Value	1,259,825		1,736,280
Derivative Assets, Netting Adjustments	(642,685)		(669,203)
Derivative Assets, Net Fair Value Before Cash Collateral	617,140		1,067,077
Derivative Assets, Cash Collateral	(222,849)		(186,734)
Derviative contracts, net of cash collateral, Assets, Fair value	394,291		880,343
Derivative Liabilities, Fair Value, Net [Abstract]
Derivative Liabilities, Gross Fair Value	1,293,255		1,708,852
Derivative Liabilities, Netting Adjustments	(642,685)		(669,203)
Derivative Liabilities, Net Fair Value Before Cash Collateral	650,570		1,039,649
Derivative Liabilities, Cash Collateral	(140,087)		(484,749)
Derivative Liabilities, Fair Value, Net of Cash Collateral	510,483		554,900
Not Designated as Hedging Instrument [Member] | Total customer risk management programs
Notional Amount of Derivatives [Abstract]
Derivative Assets, Notional	10,219,761	[1]	10,788,231	[2]
Derivative Liabilities, Notional	10,326,482	[1]	11,561,139	[2]
Derivative Assets, Fair Value, Net [Abstract]
Derivative Assets, Gross Fair Value	1,167,177		1,607,870
Derivative Assets, Netting Adjustments	(595,579)		(594,543)
Derivative Assets, Net Fair Value Before Cash Collateral	571,598		1,013,327
Derivative Assets, Cash Collateral	(221,410)		(182,088)
Derviative contracts, net of cash collateral, Assets, Fair value	350,188		831,239
Derivative Liabilities, Fair Value, Net [Abstract]
Derivative Liabilities, Gross Fair Value	1,174,061		1,612,300
Derivative Liabilities, Netting Adjustments	(595,579)		(594,543)
Derivative Liabilities, Net Fair Value Before Cash Collateral	578,482		1,017,757
Derivative Liabilities, Cash Collateral	(80,146)		(484,326)
Derivative Liabilities, Fair Value, Net of Cash Collateral	498,336		533,431
Not Designated as Hedging Instrument [Member] | Interest rate contracts [Member]
Notional Amount of Derivatives [Abstract]
Derivative Assets, Notional	2,691,550	[1]	2,629,318	[2]
Derivative Liabilities, Notional	2,691,550	[1]	2,629,122	[2]
Derivative Assets, Fair Value, Net [Abstract]
Derivative Assets, Gross Fair Value	121,481		158,825
Derivative Assets, Netting Adjustments	(3,303)		0
Derivative Assets, Net Fair Value Before Cash Collateral	118,178		158,825
Derivative Assets, Cash Collateral	(98,143)		(114,955)
Derviative contracts, net of cash collateral, Assets, Fair value	20,035		43,870
Derivative Liabilities, Fair Value, Net [Abstract]
Derivative Liabilities, Gross Fair Value	121,040		158,816
Derivative Liabilities, Netting Adjustments	(3,303)		0
Derivative Liabilities, Net Fair Value Before Cash Collateral	117,737		158,816
Derivative Liabilities, Cash Collateral	0		0
Derivative Liabilities, Fair Value, Net of Cash Collateral	117,737		158,816
Not Designated as Hedging Instrument [Member] | Energy contracts [Member]
Notional Amount of Derivatives [Abstract]
Derivative Assets, Notional	7,456,604	[1]	7,918,020	[2]
Derivative Liabilities, Notional	7,564,737	[1]	8,696,060	[2]
Derivative Assets, Fair Value, Net [Abstract]
Derivative Assets, Gross Fair Value	988,149		1,232,283
Derivative Assets, Netting Adjustments	(592,276)		(594,543)
Derivative Assets, Net Fair Value Before Cash Collateral	395,873		637,740
Derivative Assets, Cash Collateral	(121,612)		(67,024)
Derviative contracts, net of cash collateral, Assets, Fair value	274,261		570,716
Derivative Liabilities, Fair Value, Net [Abstract]
Derivative Liabilities, Gross Fair Value	997,077		1,242,058
Derivative Liabilities, Netting Adjustments	(592,276)		(594,543)
Derivative Liabilities, Net Fair Value Before Cash Collateral	404,801		647,515
Derivative Liabilities, Cash Collateral	(80,146)		(484,319)
Derivative Liabilities, Fair Value, Net of Cash Collateral	324,655		163,196
Not Designated as Hedging Instrument [Member] | Foreign exchange contracts [Member]
Notional Amount of Derivatives [Abstract]
Derivative Assets, Notional	59,321	[1]	219,791	[2]
Derivative Liabilities, Notional	57,909	[1]	214,855	[2]
Derivative Assets, Fair Value, Net [Abstract]
Derivative Assets, Gross Fair Value	57,431		216,569
Derivative Assets, Netting Adjustments	0		0
Derivative Assets, Net Fair Value Before Cash Collateral	57,431		216,569
Derivative Assets, Cash Collateral	(1,560)		0
Derviative contracts, net of cash collateral, Assets, Fair value	55,871		216,569
Derivative Liabilities, Fair Value, Net [Abstract]
Derivative Liabilities, Gross Fair Value	55,828		211,233
Derivative Liabilities, Netting Adjustments	0		0
Derivative Liabilities, Net Fair Value Before Cash Collateral	55,828		211,233
Derivative Liabilities, Cash Collateral	0		(7)
Derivative Liabilities, Fair Value, Net of Cash Collateral	55,828		211,226
Not Designated as Hedging Instrument [Member] | Equity option contracts [Member]
Notional Amount of Derivatives [Abstract]
Derivative Assets, Notional	12,286	[1]	21,102	[2]
Derivative Liabilities, Notional	12,286	[1]	21,102	[2]
Derivative Assets, Fair Value, Net [Abstract]
Derivative Assets, Gross Fair Value	116		193
Derivative Assets, Netting Adjustments	0		0
Derivative Assets, Net Fair Value Before Cash Collateral	116		193
Derivative Assets, Cash Collateral	(95)		(109)
Derviative contracts, net of cash collateral, Assets, Fair value	21		84
Derivative Liabilities, Fair Value, Net [Abstract]
Derivative Liabilities, Gross Fair Value	116		193
Derivative Liabilities, Netting Adjustments	0		0
Derivative Liabilities, Net Fair Value Before Cash Collateral	116		193
Derivative Liabilities, Cash Collateral	0		0
Derivative Liabilities, Fair Value, Net of Cash Collateral	116		193
Not Designated as Hedging Instrument [Member] | Trading [Member]
Notional Amount of Derivatives [Abstract]
Derivative Assets, Notional	14,507,221	[1]	17,400,037	[2]
Derivative Liabilities, Notional	16,042,176	[1]	14,038,906	[2]
Derivative Assets, Fair Value, Net [Abstract]
Derivative Assets, Gross Fair Value	87,395		126,910
Derivative Assets, Netting Adjustments	(45,420)		(74,647)
Derivative Assets, Net Fair Value Before Cash Collateral	41,975		52,263
Derivative Assets, Cash Collateral	(1,439)		(4,646)
Derviative contracts, net of cash collateral, Assets, Fair value	40,536		47,617
Derivative Liabilities, Fair Value, Net [Abstract]
Derivative Liabilities, Gross Fair Value	116,109		94,958
Derivative Liabilities, Netting Adjustments	(45,420)		(74,647)
Derivative Liabilities, Net Fair Value Before Cash Collateral	70,689		20,311
Derivative Liabilities, Cash Collateral	(59,941)		(423)
Derivative Liabilities, Fair Value, Net of Cash Collateral	10,748		19,888
Not Designated as Hedging Instrument [Member] | Internal risk management programs [Member]
Notional Amount of Derivatives [Abstract]
Derivative Assets, Notional	165,207	[1]	85,000	[2]
Derivative Liabilities, Notional	135,415	[1]	178,806	[2]
Derivative Assets, Fair Value, Net [Abstract]
Derivative Assets, Gross Fair Value	5,253		1,500
Derivative Assets, Netting Adjustments	(1,686)		(13)
Derivative Assets, Net Fair Value Before Cash Collateral	3,567		1,487
Derivative Assets, Cash Collateral	0		0
Derviative contracts, net of cash collateral, Assets, Fair value	3,567		1,487
Derivative Liabilities, Fair Value, Net [Abstract]
Derivative Liabilities, Gross Fair Value	3,085		1,594
Derivative Liabilities, Netting Adjustments	(1,686)		(13)
Derivative Liabilities, Net Fair Value Before Cash Collateral	1,399		1,581
Derivative Liabilities, Cash Collateral	0		0
Derivative Liabilities, Fair Value, Net of Cash Collateral	$ 1,399		$ 1,581

[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.

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Derivatives, Derivatives Instruments Gain (Loss) in Income Statement (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]
Brokergage and Trading Revenue		$ (54,739)	$ 42,013
Gain (Loss) on Derivatives, Net		(1,344)	(46,981)
Total customer risk management programs
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]
Brokergage and Trading Revenue		8,354	10,939
Gain (Loss) on Derivatives, Net		0	0
Interest rate contracts [Member]
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]
Brokergage and Trading Revenue		1,770	6,342
Gain (Loss) on Derivatives, Net		0	0
Energy contracts [Member]
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]
Brokergage and Trading Revenue		6,553	4,449
Gain (Loss) on Derivatives, Net		0	0
Foreign exchange contracts [Member]
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]
Brokergage and Trading Revenue		31	148
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]	(63,093)	31,074
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		$ (1,344)	$ (46,981)

[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.

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Loans and Allowance for Credit Losses, Loans by Portfolio Type (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Loan receivables disclosure [Abstract]
Loans, fixed rate of interest	$ 6,432,171	$ 6,366,303
Loans, variable rate of interest	16,197,587	16,069,050
Loans, non-accrual	120,295	121,797
Total	22,750,053	22,557,150
Credit Commitments [Abstract]
Outstanding commitments to extend credit	15,100,000
Outstanding standby letters of credit	790,000
Commercial [Member]
Loan receivables disclosure [Abstract]
Loans, fixed rate of interest	3,427,345	3,392,422
Loans, variable rate of interest	10,735,572	10,759,780
Loans, non-accrual	54,432	60,297
Total	14,217,349	14,212,499
Commercial real estate [Member]
Loan receivables disclosure [Abstract]
Loans, fixed rate of interest	879,806	874,716
Loans, variable rate of interest	3,913,842	3,715,491
Loans, non-accrual	21,668	16,570
Total	4,815,316	4,606,777
Loans to individuals [Member]
Loan receivables disclosure [Abstract]
Loans, fixed rate of interest	2,125,020	2,099,165
Loans, variable rate of interest	1,548,173	1,593,779
Loans, non-accrual	44,195	44,930
Total	$ 3,717,388	$ 3,737,874

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Loans and Allowances for Credit Losses, Activity in Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 235,704	$ 256,421
Provision for loan losses	14,525	(3,967)
Loans charged off	(3,667)	(7,805)
Recoveries of loans previously charged off	2,898	1,824
Ending balance	249,460	246,473
Provision Details [Abstract]
Provision for credit losses	16,000	0
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning balance	60,919	32,977
Provision for off-balance sheet credit risk	2,024	3,268
Ending balance	62,943	36,245
Recorded investment [Abstract]
Collectively measured for impairment, recorded investment	22,629,758		$ 22,435,353
Individually measured for impairment, recorded investment	120,295		121,797
Total	22,750,053		22,557,150
Related allowance [Abstract]
Collectively measured for impairment, related allowance	245,427		230,134
Individually measured for impairment, related allowance	4,033		5,570
Total	249,460		235,704
Commercial [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	131,586	162,056
Provision for loan losses	6,330	(5,118)
Loans charged off	(12)	(6,081)
Recoveries of loans previously charged off	1,994	591
Ending balance	139,898	151,448
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning balance	18,246	13,812
Provision for off-balance sheet credit risk	2,362	154
Ending balance	20,608	13,966
Recorded investment [Abstract]
Collectively measured for impairment, recorded investment	14,162,917		14,152,202
Individually measured for impairment, recorded investment	54,432		60,297
Total	14,217,349		14,212,499
Related allowance [Abstract]
Collectively measured for impairment, related allowance	137,415		127,566
Individually measured for impairment, related allowance	2,483		4,020
Total	139,898		131,586
Commercial real estate [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	57,648	58,553
Provision for loan losses	10,426	468
Loans charged off	(2,208)	(191)
Recoveries of loans previously charged off	137	144
Ending balance	66,003	58,974
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning balance	40,490	17,442
Provision for off-balance sheet credit risk	(279)	3,023
Ending balance	40,211	20,465
Recorded investment [Abstract]
Collectively measured for impairment, recorded investment	4,793,648		4,590,207
Individually measured for impairment, recorded investment	21,668		16,570
Total	4,815,316		4,606,777
Related allowance [Abstract]
Collectively measured for impairment, related allowance	64,453		56,098
Individually measured for impairment, related allowance	1,550		1,550
Total	66,003		57,648
Loans to individuals [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	46,470	35,812
Provision for loan losses	(2,231)	683
Loans charged off	(1,447)	(1,533)
Recoveries of loans previously charged off	767	1,089
Ending balance	43,559	36,051
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning balance	2,183	1,723
Provision for off-balance sheet credit risk	(59)	91
Ending balance	2,124	$ 1,814
Recorded investment [Abstract]
Collectively measured for impairment, recorded investment	3,673,193		3,692,944
Individually measured for impairment, recorded investment	44,195		44,930
Total	3,717,388		3,737,874
Related allowance [Abstract]
Collectively measured for impairment, related allowance	43,559		46,470
Individually measured for impairment, related allowance	0		0
Total	$ 43,559		$ 46,470

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Loans and Allowances for Credit Losses, Credit Quality Indicators (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	$ 840,927		$ 4,453,665
Financing Receivable, Originated, Year Two	4,425,700		3,294,886
Financing Receivable, Originated, Year Three	3,248,207		2,107,063
Financing Receivable, Originated, Year Four	2,020,125		1,734,561
Financing Receivable, Originated, Year Five	1,680,558		1,157,972
Financing Receivable, Originated, More Than Five Years	3,868,349		2,992,242
Financing Receivable, Revolving	6,641,089		6,790,248
Financing Receivable, Revolving, Converted to Term Loan	25,098		26,513
Total	22,750,053		22,557,150
Financing Receivable, Allowance for Credit Loss, Writeoff	3,667	$ 7,805
Commercial [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	698,796		2,655,782
Financing Receivable, Originated, Year Two	2,455,188		1,566,129
Financing Receivable, Originated, Year Three	1,494,936		994,261
Financing Receivable, Originated, Year Four	930,690		838,006
Financing Receivable, Originated, Year Five	775,049		779,311
Financing Receivable, Originated, More Than Five Years	2,279,853		1,657,429
Financing Receivable, Revolving	5,580,003		5,718,433
Financing Receivable, Revolving, Converted to Term Loan	2,834		3,148
Total	14,217,349		14,212,499
Financing Receivable, Allowance for Credit Loss, Writeoff	12	6,081
Commercial [Member] | Energy [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	12,973		157,745
Financing Receivable Year One Originated Current Fiscal Year Writeoff	0
Financing Receivable, Originated, Year Two	146,448		76,951
Financing Receivable Year Two Originated Fiscal Year Before Current Fiscal Year Writeoff	0
Financing Receivable, Originated, Year Three	66,052		30,284
Financing Receivable Year Three Originated Two Years Before Current Fiscal Year Writeoff	0
Financing Receivable, Originated, Year Four	8,865		13,447
Financing Receivable Year Four Originated Three Years Before Current Fiscal Year Writeoff	0
Financing Receivable, Originated, Year Five	11,959		6,377
Financing Receivable Year Five Originated Four Years Before Current Fiscal Year Writeoff	0
Financing Receivable, Originated, More Than Five Years	12,595		5,822
Financing Receivable Originated More than Five Years Before Current Fiscal Year Writeoff	0
Financing Receivable, Revolving	3,139,165		3,134,164
Financing Receivable Revolving Writeoff	0
Financing Receivable, Revolving, Converted to Term Loan	0		0
Financing Receivable Revolving Converted to Term Writeoff	0
Total	3,398,057		3,424,790
Financing Receivable, Allowance for Credit Loss, Writeoff	0
Commercial [Member] | Healthcare [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	175,703		932,097
Financing Receivable Year One Originated Current Fiscal Year Writeoff	0
Financing Receivable, Originated, Year Two	876,440		604,886
Financing Receivable Year Two Originated Fiscal Year Before Current Fiscal Year Writeoff	0
Financing Receivable, Originated, Year Three	615,847		476,854
Financing Receivable Year Three Originated Two Years Before Current Fiscal Year Writeoff	0
Financing Receivable, Originated, Year Four	482,182		450,755
Financing Receivable Year Four Originated Three Years Before Current Fiscal Year Writeoff	0
Financing Receivable, Originated, Year Five	436,197		471,362
Financing Receivable Year Five Originated Four Years Before Current Fiscal Year Writeoff	0
Financing Receivable, Originated, More Than Five Years	1,091,901		659,507
Financing Receivable Originated More than Five Years Before Current Fiscal Year Writeoff	0
Financing Receivable, Revolving	221,052		249,536
Financing Receivable Revolving Writeoff	0
Financing Receivable, Revolving, Converted to Term Loan	19		20
Financing Receivable Revolving Converted to Term Writeoff	0
Total	3,899,341		3,845,017
Financing Receivable, Allowance for Credit Loss, Writeoff	0
Commercial [Member] | Services [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	216,237		822,287
Financing Receivable Year One Originated Current Fiscal Year Writeoff	0
Financing Receivable, Originated, Year Two	778,794		507,219
Financing Receivable Year Two Originated Fiscal Year Before Current Fiscal Year Writeoff	0
Financing Receivable, Originated, Year Three	477,545		287,523
Financing Receivable Year Three Originated Two Years Before Current Fiscal Year Writeoff	0
Financing Receivable, Originated, Year Four	275,660		196,711
Financing Receivable Year Four Originated Three Years Before Current Fiscal Year Writeoff	0
Financing Receivable, Originated, Year Five	174,808		157,673
Financing Receivable Year Five Originated Four Years Before Current Fiscal Year Writeoff	0
Financing Receivable, Originated, More Than Five Years	810,360		702,823
Financing Receivable Originated More than Five Years Before Current Fiscal Year Writeoff	0
Financing Receivable, Revolving	829,708		756,524
Financing Receivable Revolving Writeoff	5
Financing Receivable, Revolving, Converted to Term Loan	590		761
Financing Receivable Revolving Converted to Term Writeoff	0
Total	3,563,702		3,431,521
Financing Receivable, Allowance for Credit Loss, Writeoff	5
Commercial [Member] | General business [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	293,883		743,653
Financing Receivable Year One Originated Current Fiscal Year Writeoff	0
Financing Receivable, Originated, Year Two	653,506		377,073
Financing Receivable Year Two Originated Fiscal Year Before Current Fiscal Year Writeoff	0
Financing Receivable, Originated, Year Three	335,492		199,600
Financing Receivable Year Three Originated Two Years Before Current Fiscal Year Writeoff	0
Financing Receivable, Originated, Year Four	163,983		177,093
Financing Receivable Year Four Originated Three Years Before Current Fiscal Year Writeoff	0
Financing Receivable, Originated, Year Five	152,085		143,899
Financing Receivable Year Five Originated Four Years Before Current Fiscal Year Writeoff	0
Financing Receivable, Originated, More Than Five Years	364,997		289,277
Financing Receivable Originated More than Five Years Before Current Fiscal Year Writeoff	3
Financing Receivable, Revolving	1,390,078		1,578,209
Financing Receivable Revolving Writeoff	0
Financing Receivable, Revolving, Converted to Term Loan	2,225		2,367
Financing Receivable Revolving Converted to Term Writeoff	4
Total	3,356,249		3,511,171
Financing Receivable, Allowance for Credit Loss, Writeoff	7
Commercial real estate [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	46,900		1,188,483
Financing Receivable Year One Originated Current Fiscal Year Writeoff	0
Financing Receivable, Originated, Year Two	1,383,300		1,158,002
Financing Receivable Year Two Originated Fiscal Year Before Current Fiscal Year Writeoff	0
Financing Receivable, Originated, Year Three	1,187,644		552,616
Financing Receivable Year Three Originated Two Years Before Current Fiscal Year Writeoff	0
Financing Receivable, Originated, Year Four	540,129		648,561
Financing Receivable Year Four Originated Three Years Before Current Fiscal Year Writeoff	0
Financing Receivable, Originated, Year Five	651,970		247,625
Financing Receivable Year Five Originated Four Years Before Current Fiscal Year Writeoff	0
Financing Receivable, Originated, More Than Five Years	857,310		649,874
Financing Receivable Originated More than Five Years Before Current Fiscal Year Writeoff	2,208
Financing Receivable, Revolving	148,063		161,616
Financing Receivable Revolving Writeoff	0
Financing Receivable, Revolving, Converted to Term Loan	0		0
Financing Receivable Revolving Converted to Term Writeoff	0
Total	4,815,316		4,606,777
Financing Receivable, Allowance for Credit Loss, Writeoff	2,208	191
Loans to individuals [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	95,231		609,400
Financing Receivable, Originated, Year Two	587,212		570,755
Financing Receivable, Originated, Year Three	565,627		560,186
Financing Receivable, Originated, Year Four	549,306		247,994
Financing Receivable, Originated, Year Five	253,539		131,036
Financing Receivable, Originated, More Than Five Years	731,186		684,939
Financing Receivable, Revolving	913,023		910,199
Financing Receivable, Revolving, Converted to Term Loan	22,264		23,365
Total	3,717,388		3,737,874
Financing Receivable, Allowance for Credit Loss, Writeoff	1,447	$ 1,533
Loans to individuals [Member] | Residential mortgage [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	71,000		354,529
Financing Receivable Year One Originated Current Fiscal Year Writeoff	0
Financing Receivable, Originated, Year Two	349,949		374,927
Financing Receivable Year Two Originated Fiscal Year Before Current Fiscal Year Writeoff	0
Financing Receivable, Originated, Year Three	372,782		395,948
Financing Receivable Year Three Originated Two Years Before Current Fiscal Year Writeoff	0
Financing Receivable, Originated, Year Four	385,114		63,504
Financing Receivable Year Four Originated Three Years Before Current Fiscal Year Writeoff	0
Financing Receivable, Originated, Year Five	62,058		42,571
Financing Receivable Year Five Originated Four Years Before Current Fiscal Year Writeoff	0
Financing Receivable, Originated, More Than Five Years	306,740		281,290
Financing Receivable Originated More than Five Years Before Current Fiscal Year Writeoff	4
Financing Receivable, Revolving	356,412		354,986
Financing Receivable Revolving Writeoff	0
Financing Receivable, Revolving, Converted to Term Loan	21,972		23,029
Financing Receivable Revolving Converted to Term Writeoff	1
Total	1,926,027		1,890,784
Financing Receivable, Allowance for Credit Loss, Writeoff	5
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		289
Financing Receivable, Originated, Year Two	1,021		2,254
Financing Receivable, Originated, Year Three	2,321		9,299
Financing Receivable, Originated, Year Four	7,620		12,182
Financing Receivable, Originated, Year Five	9,968		19,563
Financing Receivable, Originated, More Than Five Years	203,823		202,353
Financing Receivable, Revolving	0		0
Financing Receivable, Revolving, Converted to Term Loan	0		0
Total	224,753		245,940
Loans to individuals [Member] | Personal [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	24,231		254,582
Financing Receivable Year One Originated Current Fiscal Year Writeoff	0
Financing Receivable, Originated, Year Two	236,242		193,574
Financing Receivable Year Two Originated Fiscal Year Before Current Fiscal Year Writeoff	0
Financing Receivable, Originated, Year Three	190,524		154,939
Financing Receivable Year Three Originated Two Years Before Current Fiscal Year Writeoff	0
Financing Receivable, Originated, Year Four	156,572		172,308
Financing Receivable Year Four Originated Three Years Before Current Fiscal Year Writeoff	0
Financing Receivable, Originated, Year Five	181,513		68,902
Financing Receivable Year Five Originated Four Years Before Current Fiscal Year Writeoff	0
Financing Receivable, Originated, More Than Five Years	220,623		201,296
Financing Receivable Originated More than Five Years Before Current Fiscal Year Writeoff	1,437
Financing Receivable, Revolving	556,611		555,213
Financing Receivable Revolving Writeoff	1
Financing Receivable, Revolving, Converted to Term Loan	292		336
Financing Receivable Revolving Converted to Term Writeoff	4
Total	1,566,608		1,601,150
Financing Receivable, Allowance for Credit Loss, Writeoff	1,442
Performing [Member] | Commercial [Member] | Energy [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	12,973		157,745
Financing Receivable, Originated, Year Two	146,448		76,951
Financing Receivable, Originated, Year Three	66,052		30,284
Financing Receivable, Originated, Year Four	8,865		12,783
Financing Receivable, Originated, Year Five	11,301		5,992
Financing Receivable, Originated, More Than Five Years	11,408		4,980
Financing Receivable, Revolving	3,119,103		3,104,906
Financing Receivable, Revolving, Converted to Term Loan	0		0
Total	3,376,150		3,393,641
Performing [Member] | Commercial [Member] | Energy [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One			0
Financing Receivable, Originated, Year Two			0
Financing Receivable, Originated, Year Three			0
Financing Receivable, Originated, Year Four			0
Financing Receivable, Originated, Year Five			0
Financing Receivable, Originated, More Than Five Years			0
Financing Receivable, Revolving			0
Financing Receivable, Revolving, Converted to Term Loan			0
Total			0
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		664
Financing Receivable, Originated, Year Five	658		385
Financing Receivable, Originated, More Than Five Years	1,060		683
Financing Receivable, Revolving	20,062		28,018
Financing Receivable, Revolving, Converted to Term Loan	0		0
Total	21,780		29,750
Performing [Member] | Commercial [Member] | Healthcare [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	175,703		932,097
Financing Receivable, Originated, Year Two	876,440		604,886
Financing Receivable, Originated, Year Three	615,643		476,854
Financing Receivable, Originated, Year Four	479,575		404,204
Financing Receivable, Originated, Year Five	386,837		464,989
Financing Receivable, Originated, More Than Five Years	1,027,229		618,163
Financing Receivable, Revolving	220,992		245,898
Financing Receivable, Revolving, Converted to Term Loan	19		20
Total	3,782,438		3,747,111
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	0		0
Financing Receivable, Originated, Year Three	204		0
Financing Receivable, Originated, Year Four	429		20,071
Financing Receivable, Originated, Year Five	21,767		0
Financing Receivable, Originated, More Than Five Years	45,663		18,859
Financing Receivable, Revolving	60		4
Financing Receivable, Revolving, Converted to Term Loan	0		0
Total	68,123		38,934
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	0		0
Financing Receivable, Originated, Year Three	0		0
Financing Receivable, Originated, Year Four	2,178		0
Financing Receivable, Originated, Year Five	1,456		0
Financing Receivable, Originated, More Than Five Years	7,899		14,304
Financing Receivable, Revolving	0		3,634
Financing Receivable, Revolving, Converted to Term Loan	0		0
Total	11,533		17,938
Performing [Member] | Commercial [Member] | Services [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	216,237		821,785
Financing Receivable, Originated, Year Two	759,320		496,510
Financing Receivable, Originated, Year Three	470,813		286,085
Financing Receivable, Originated, Year Four	275,065		193,481
Financing Receivable, Originated, Year Five	171,904		156,736
Financing Receivable, Originated, More Than Five Years	805,240		696,300
Financing Receivable, Revolving	799,522		722,371
Financing Receivable, Revolving, Converted to Term Loan	506		639
Total	3,498,607		3,373,907
Performing [Member] | Commercial [Member] | Services [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0		502
Financing Receivable, Originated, Year Two	19,077		5,139
Financing Receivable, Originated, Year Three	1,365		989
Financing Receivable, Originated, Year Four	219		771
Financing Receivable, Originated, Year Five	672		894
Financing Receivable, Originated, More Than Five Years	2,521		1,345
Financing Receivable, Revolving	6,246		8,668
Financing Receivable, Revolving, Converted to Term Loan	0		0
Total	30,100		18,308
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	397		0
Financing Receivable, Originated, Year Three	86		0
Financing Receivable, Originated, Year Four	0		2,459
Financing Receivable, Originated, Year Five	2,232		43
Financing Receivable, Originated, More Than Five Years	2,599		2,789
Financing Receivable, Revolving	21,499		17,665
Financing Receivable, Revolving, Converted to Term Loan	84		122
Total	26,897		23,078
Performing [Member] | Commercial [Member] | General business [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	288,367		725,894
Financing Receivable, Originated, Year Two	607,548		361,839
Financing Receivable, Originated, Year Three	320,451		198,274
Financing Receivable, Originated, Year Four	162,810		172,878
Financing Receivable, Originated, Year Five	147,988		139,140
Financing Receivable, Originated, More Than Five Years	355,227		283,694
Financing Receivable, Revolving	1,336,404		1,570,536
Financing Receivable, Revolving, Converted to Term Loan	2,193		2,329
Total	3,220,988		3,454,584
Performing [Member] | Commercial [Member] | General business [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0		17,759
Financing Receivable, Originated, Year Two	7,515		13,065
Financing Receivable, Originated, Year Three	8,200		208
Financing Receivable, Originated, Year Four	87		71
Financing Receivable, Originated, Year Five	70		7
Financing Receivable, Originated, More Than Five Years	1,762		2,291
Financing Receivable, Revolving	31,903		7,094
Financing Receivable, Revolving, Converted to Term Loan	25		26
Total	49,562		40,521
Performing [Member] | Commercial [Member] | General business [Member] | Accruing Substandard [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	5,516		0
Financing Receivable, Originated, Year Two	38,443		2,169
Financing Receivable, Originated, Year Three	6,841		66
Financing Receivable, Originated, Year Four	56		4,130
Financing Receivable, Originated, Year Five	4,013		4,680
Financing Receivable, Originated, More Than Five Years	7,940		3,287
Financing Receivable, Revolving	13,929		94
Financing Receivable, Revolving, Converted to Term Loan	0		4
Total	76,738		14,430
Performing [Member] | Commercial real estate [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	46,900		1,188,483
Financing Receivable, Originated, Year Two	1,383,300		1,158,002
Financing Receivable, Originated, Year Three	1,187,644		552,616
Financing Receivable, Originated, Year Four	540,129		641,102
Financing Receivable, Originated, Year Five	644,511		247,625
Financing Receivable, Originated, More Than Five Years	832,101		633,304
Financing Receivable, Revolving	148,063		161,616
Financing Receivable, Revolving, Converted to Term Loan	0		0
Total	4,782,648		4,582,748
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	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	11,000		0
Financing Receivable, Revolving	0		0
Financing Receivable, Revolving, Converted to Term Loan	0		0
Total	11,000		0
Performing [Member] | Commercial real estate [Member] | Accruing Substandard [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One			0
Financing Receivable, Originated, Year Two			0
Financing Receivable, Originated, Year Three			0
Financing Receivable, Originated, Year Four			7,459
Financing Receivable, Originated, Year Five			0
Financing Receivable, Originated, More Than Five Years			0
Financing Receivable, Revolving			0
Financing Receivable, Revolving, Converted to Term Loan			0
Total			7,459
Performing [Member] | Loans to individuals [Member] | Residential mortgage [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	71,000		354,497
Financing Receivable, Originated, Year Two	348,697		373,190
Financing Receivable, Originated, Year Three	371,044		393,002
Financing Receivable, Originated, Year Four	380,908		63,142
Financing Receivable, Originated, Year Five	61,409		40,525
Financing Receivable, Originated, More Than Five Years	285,877		260,625
Financing Receivable, Revolving	351,428		352,126
Financing Receivable, Revolving, Converted to Term Loan	21,242		22,176
Total	1,891,605		1,859,283
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		0
Financing Receivable, Originated, Year Two	68		81
Financing Receivable, Originated, Year Three	0		42
Financing Receivable, Originated, Year Four	1,355		0
Financing Receivable, Originated, Year Five	0		142
Financing Receivable, Originated, More Than Five Years	309		388
Financing Receivable, Revolving	2,843		527
Financing Receivable, Revolving, Converted to Term Loan	0		87
Total	4,575		1,267
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		0
Financing Receivable, Originated, Year Three	0		187
Financing Receivable, Originated, Year Four	0		0
Financing Receivable, Originated, Year Five	0		0
Financing Receivable, Originated, More Than Five Years	7		138
Financing Receivable, Revolving	147		117
Financing Receivable, Revolving, Converted to Term Loan	0		1
Total	154		443
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		289
Financing Receivable, Originated, Year Two	1,021		2,254
Financing Receivable, Originated, Year Three	2,321		9,000
Financing Receivable, Originated, Year Four	7,321		10,722
Financing Receivable, Originated, Year Five	8,963		17,244
Financing Receivable, Originated, More Than Five Years	190,825		191,426
Financing Receivable, Revolving	0		0
Financing Receivable, Revolving, Converted to Term Loan	0		0
Total	210,451		230,935
Performing [Member] | Loans to individuals [Member] | Personal [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	24,231		254,497
Financing Receivable, Originated, Year Two	236,041		193,095
Financing Receivable, Originated, Year Three	190,370		154,887
Financing Receivable, Originated, Year Four	156,515		172,114
Financing Receivable, Originated, Year Five	181,332		68,871
Financing Receivable, Originated, More Than Five Years	220,604		201,278
Financing Receivable, Revolving	550,478		549,187
Financing Receivable, Revolving, Converted to Term Loan	253		332
Total	1,559,824		1,594,261
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		47
Financing Receivable, Originated, Year Two	115		28
Financing Receivable, Originated, Year Three	109		40
Financing Receivable, Originated, Year Four	47		12
Financing Receivable, Originated, Year Five	2		17
Financing Receivable, Originated, More Than Five Years	0		0
Financing Receivable, Revolving	6,055		6,003
Financing Receivable, Revolving, Converted to Term Loan	39		4
Total	6,367		6,151
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	17		444
Financing Receivable, Originated, Year Three	40		0
Financing Receivable, Originated, Year Four	0		160
Financing Receivable, Originated, Year Five	160		0
Financing Receivable, Originated, More Than Five Years	0		0
Financing Receivable, Revolving	0		0
Financing Receivable, Revolving, Converted to Term Loan	0		0
Total	217		604
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	127		159
Financing Receivable, Revolving	0		1,240
Financing Receivable, Revolving, Converted to Term Loan	0		0
Total	127		1,399
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		26,480
Financing Receivable, Originated, Year Five	26,137		6,373
Financing Receivable, Originated, More Than Five Years	11,110		8,181
Financing Receivable, Revolving	0		0
Financing Receivable, Revolving, Converted to Term Loan	0		0
Total	37,247		41,034
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		5,570
Financing Receivable, Originated, Year Three	5,281		449
Financing Receivable, Originated, Year Four	376		0
Financing Receivable, Originated, Year Five	0		0
Financing Receivable, Originated, More Than Five Years	0		2,389
Financing Receivable, Revolving	2,441		7,820
Financing Receivable, Revolving, Converted to Term Loan	0		0
Total	8,098		16,228
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	0		0
Financing Receivable, Originated, Year Three	0		1,052
Financing Receivable, Originated, Year Four	1,030		14
Financing Receivable, Originated, Year Five	14		72
Financing Receivable, Originated, More Than Five Years	68		5
Financing Receivable, Revolving	7,842		485
Financing Receivable, Revolving, Converted to Term Loan	7		8
Total	8,961		1,636
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	0		0
Financing Receivable, Originated, Year Three	0		0
Financing Receivable, Originated, Year Four	0		0
Financing Receivable, Originated, Year Five	7,459		0
Financing Receivable, Originated, More Than Five Years	14,209		16,570
Financing Receivable, Revolving	0		0
Financing Receivable, Revolving, Converted to Term Loan	0		0
Total	21,668		16,570
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		32
Financing Receivable, Originated, Year Two	1,184		1,656
Financing Receivable, Originated, Year Three	1,738		2,717
Financing Receivable, Originated, Year Four	2,851		362
Financing Receivable, Originated, Year Five	649		1,904
Financing Receivable, Originated, More Than Five Years	20,547		20,139
Financing Receivable, Revolving	1,994		2,216
Financing Receivable, Revolving, Converted to Term Loan	730		765
Total	29,693		29,791
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		299
Financing Receivable, Originated, Year Four	299		1,460
Financing Receivable, Originated, Year Five	1,005		2,319
Financing Receivable, Originated, More Than Five Years	12,998		10,927
Financing Receivable, Revolving	0		0
Financing Receivable, Revolving, Converted to Term Loan	0		0
Total	14,302		15,005
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		38
Financing Receivable, Originated, Year Two	69		7
Financing Receivable, Originated, Year Three	5		12
Financing Receivable, Originated, Year Four	10		22
Financing Receivable, Originated, Year Five	19		14
Financing Receivable, Originated, More Than Five Years	19		18
Financing Receivable, Revolving	78		23
Financing Receivable, Revolving, Converted to Term Loan	0		0
Total	$ 200		$ 134

XML

Loans and Allowances for Credit Losses Loans and Allowances for Credit Losses, Nonaccrual (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	$ 120,295	$ 121,797
Financing Receivable, Nonaccrual, No Allowance	98,545	90,854
Financing Receivable, Nonaccrual, With Allowance	21,750	30,943
Financing Receivable, Nonaccrual, Related Allowance	4,033	5,570
Commercial [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	54,432	60,297
Financing Receivable, Nonaccrual, No Allowance	46,722	45,531
Financing Receivable, Nonaccrual, With Allowance	7,710	14,766
Financing Receivable, Nonaccrual, Related Allowance	2,483	4,020
Commercial [Member] | Energy [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	127	1,399
Financing Receivable, Nonaccrual, No Allowance	127	1,399
Financing Receivable, Nonaccrual, With Allowance	0	0
Financing Receivable, Nonaccrual, Related Allowance	0	0
Commercial [Member] | Healthcare [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	37,247	41,034
Financing Receivable, Nonaccrual, No Allowance	37,247	34,661
Financing Receivable, Nonaccrual, With Allowance	0	6,373
Financing Receivable, Nonaccrual, Related Allowance	0	946
Commercial [Member] | Services [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	8,097	16,228
Financing Receivable, Nonaccrual, No Allowance	387	7,835
Financing Receivable, Nonaccrual, With Allowance	7,710	8,393
Financing Receivable, Nonaccrual, Related Allowance	2,483	3,074
Commercial [Member] | General business [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	8,961	1,636
Financing Receivable, Nonaccrual, No Allowance	8,961	1,636
Financing Receivable, Nonaccrual, With Allowance	0	0
Financing Receivable, Nonaccrual, Related Allowance	0	0
Commercial real estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	21,668	16,570
Financing Receivable, Nonaccrual, No Allowance	7,628	393
Financing Receivable, Nonaccrual, With Allowance	14,040	16,177
Financing Receivable, Nonaccrual, Related Allowance	1,550	1,550
Loans to individuals [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	44,195	44,930
Financing Receivable, Nonaccrual, No Allowance	44,195	44,930
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	29,693	29,791
Financing Receivable, Nonaccrual, No Allowance	29,693	29,791
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	200	134
Financing Receivable, Nonaccrual, No Allowance	200	134
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	14,302	15,005
Financing Receivable, Nonaccrual, No Allowance	14,302	15,005
Financing Receivable, Nonaccrual, With Allowance	0	0
Financing Receivable, Nonaccrual, Related Allowance	$ 0	$ 0

XML

Loans and Allowances for Credit Losses, Modifications (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modified in Period, Amount	$ 35,000
Healthcare [Member] | Commercial [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modified in Period, Amount	26,000
US Government Agency Insured Loans [Member] | Residential mortgage [Member] | Loans to individuals [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modified, Subsequent Default	511
Financing Receivable, Modified in Period, Amount	$ 8,400

XML

Loans and Allowances for Credit Losses, By Aging Category (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Past Due 90 Days or More and Accruing	$ 65,056	$ 76,114
Current and Past Due Performing Loans	22,750,053	22,557,150
30 to 59 Days [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	74,016	55,039
60 to 89 Days [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	613	51,614
90 Days or More [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	110,990	94,633
Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	22,564,434	22,355,864
Commercial [Member]
Financing Receivable, Past Due [Line Items]
Past Due 90 Days or More and Accruing	54	396
Current and Past Due Performing Loans	14,217,349	14,212,499
Commercial [Member] | 30 to 59 Days [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	7,336	7,255
Commercial [Member] | 60 to 89 Days [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	62	30,365
Commercial [Member] | 90 Days or More [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	32,489	5,813
Commercial [Member] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	14,177,462	14,169,066
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	3,398,057	3,424,790
Commercial [Member] | Energy [Member] | 30 to 59 Days [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	0	24
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	3,398,057	3,424,766
Commercial [Member] | Healthcare [Member]
Financing Receivable, Past Due [Line Items]
Past Due 90 Days or More and Accruing	45	0
Current and Past Due Performing Loans	3,899,341	3,845,017
Commercial [Member] | Healthcare [Member] | 30 to 59 Days [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	0	5,914
Commercial [Member] | Healthcare [Member] | 60 to 89 Days [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	0	26,480
Commercial [Member] | Healthcare [Member] | 90 Days or More [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	32,420	459
Commercial [Member] | Healthcare [Member] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	3,866,921	3,812,164
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	3,563,702	3,431,521
Commercial [Member] | Services [Member] | 30 to 59 Days [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	6,844	1,060
Commercial [Member] | Services [Member] | 60 to 89 Days [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	45	2,461
Commercial [Member] | Services [Member] | 90 Days or More [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	60	4,958
Commercial [Member] | Services [Member] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	3,556,753	3,423,042
Commercial [Member] | General business [Member]
Financing Receivable, Past Due [Line Items]
Past Due 90 Days or More and Accruing	9	396
Current and Past Due Performing Loans	3,356,249	3,511,171
Commercial [Member] | General business [Member] | 30 to 59 Days [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	492	257
Commercial [Member] | General business [Member] | 60 to 89 Days [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	17	1,424
Commercial [Member] | General business [Member] | 90 Days or More [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	9	396
Commercial [Member] | General business [Member] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	3,355,731	3,509,094
Commercial real estate [Member]
Financing Receivable, Past Due [Line Items]
Past Due 90 Days or More and Accruing	0	0
Current and Past Due Performing Loans	4,815,316	4,606,777
Commercial real estate [Member] | 30 to 59 Days [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	8,965	531
Commercial real estate [Member] | 60 to 89 Days [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	45	0
Commercial real estate [Member] | 90 Days or More [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	0	217
Commercial real estate [Member] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	4,806,306	4,606,029
Loans to individuals [Member]
Financing Receivable, Past Due [Line Items]
Past Due 90 Days or More and Accruing	65,002	75,718
Current and Past Due Performing Loans	3,717,388	3,737,874
Loans to individuals [Member] | 30 to 59 Days [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	57,715	47,253
Loans to individuals [Member] | 60 to 89 Days [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	506	21,249
Loans to individuals [Member] | 90 Days or More [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	78,501	88,603
Loans to individuals [Member] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	3,580,666	3,580,769
Loans to individuals [Member] | Residential mortgage [Member]
Financing Receivable, Past Due [Line Items]
Past Due 90 Days or More and Accruing	22	114
Current and Past Due Performing Loans	1,926,027	1,890,784
Loans to individuals [Member] | Residential mortgage [Member] | 30 to 59 Days [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	8,315	10,632
Loans to individuals [Member] | Residential mortgage [Member] | 60 to 89 Days [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	363	1,828
Loans to individuals [Member] | Residential mortgage [Member] | 90 Days or More [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	6,550	6,169
Loans to individuals [Member] | Residential mortgage [Member] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	1,910,799	1,872,155
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	64,980	75,604
Current and Past Due Performing Loans	224,753	245,940
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	48,833	36,119
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	0	19,400
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	71,928	82,402
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	103,992	108,019
Loans to individuals [Member] | Personal [Member]
Financing Receivable, Past Due [Line Items]
Past Due 90 Days or More and Accruing	0	0
Current and Past Due Performing Loans	1,566,608	1,601,150
Loans to individuals [Member] | Personal [Member] | 30 to 59 Days [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	567	502
Loans to individuals [Member] | Personal [Member] | 60 to 89 Days [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	143	21
Loans to individuals [Member] | Personal [Member] | 90 Days or More [Member]
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	23	32
Loans to individuals [Member] | Personal [Member] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Current and Past Due Performing Loans	$ 1,565,875	$ 1,600,595

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Mortgage Banking Activities, Components of Loans Held For Sale (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Schedule of Residential Mortgage Loans Held For Sale [Line Items]
Number of days for past due for loan to be considered nonperforming (in days)	90 days	90 days
Residential mortgage loans held for sale, nonperforming	$ 0		$ 0
Credit losses recognized on residential mortgage loans held for sale	0	$ 0
Components of Residential Mortgage Loans Held for Sale [Abstract]
Unpaid principal balance	72,746		74,941
Residential mortgage loans held for sale, Fair value	72,113		73,938
Residential mortgage loans held for sale	$ 74,175		$ 75,272
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	$ 71,693		$ 45,492
Derivative, Net fair value	$ 2,694		$ 1,054
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	$ 127,427		$ 109,469
Derivative, Net fair value	$ (632)		$ 280

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Mortgage Banking Activities Mortgage Banking Activities, Mortgage Banking Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Mortgage Banking Revenue [Abstract]
Net realized gains (losses) on sale of mortgage loans	$ (1,731)	$ 6,883
Net change in unrealized gain (loss) on mortgage loans held for sale	370	(5,827)
Net change in the fair value of mortgage loan commitments	1,640	(3,298)
Net change in the fair value of forward sales contracts	(912)	7,297
Total production revenue	(633)	5,055
Servicing revenue	15,000	11,595
Total mortgage banking revenue	$ 14,367	$ 16,650

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Mortgage Banking Activities, Mortgage Servicing Rights (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)
Summary of Mortgage Servicing Rights [Abstract]
Number of residential mortgage loans serviced for others	118,303		110,541
Outstanding principal balance of residential mortgage loans serviced for others	$ 21,009,762,000		$ 18,863,201,000
Weighted average interest rate	3.55%		3.59%
Remaining term (in months)	285 months		283 months
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance	$ 277,608,000	$ 163,198,000	$ 163,198,000
Additions	2,500,000	5,215,000
Acquisitions	31,138,000	0
Changes due to principal payments	(5,384,000)	(7,960,000)
Change in fair value due to market assumption changes	(6,059,000)	49,110,000
Ending balance	$ 299,803,000	$ 209,563,000	$ 277,608,000
Servicing Assets at Fair Value, Assumptions Used to Estimate Fair Value [Abstract]
Discount rate - risk-free rate plus a market premium (in hundredths)	8.95%		9.51%
Prepayment rate - based upon loan interest rate, original term and loan type	7.43%		7.54%
Loan servicing costs - annually per loan based upon loan type, performing, minimum (in dollars per loan)	$ 69		$ 69
Loan servicing costs - annually per loan based upon loan type, performing, maximum (in dollars per loan)	94		94
Loan servicing costs - annually per loan based upon loan type, delinquent, minimum (in dollars per loan)	150		150
Loan servicing costs - annually per loan based upon loan type, delinquent, maximum (in dollars per loan)	500		500
Loan servicing costs - annually per loan based upon loan type, foreclosure, minimum (in dollars per loan)	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)	3.66%		4.06%
Primary secondary mortgage rate spread	105		105
Delinquency rate	1.40%		2.33%

XML

Commitments and Contingent Liabilities (Details)	3 Months Ended
	Mar. 31, 2023 USD ($)
Judicial Ruling [Member] | Misuse of Revenues Pledged to Municipal Bonds [Member]
Litigation Settlement [Abstract]
Disgorged fees	$ 1,067,721
Litigation Settlement, Amount Awarded to Other Party	$ 600,000
Pending Litigation [Member] | Misuse of Revenues Pledged to Municipal Bonds [Member]
Litigation Settlement [Abstract]
Loss Contingency, Number of Plaintiffs	2
Pending Litigation [Member] | Bank Participation in Fraudulent Sale of Securities by Principals [Member]
Litigation Settlement [Abstract]
Loss Contingency, Number of Plaintiffs	19
Outstanding principal accrued interest and other amounts upon sale of facilities securing payment of the bonds	$ 25,000,000
Principal amount of entered judgment against the principal individual and his wife	36,805,051
Pre-judgment interest amount of entered judgment against the principal individual and his wife	$ 10,937,831

XML

Commitments and Contingent Liabilities Variable Interest Entities (Details) $ in Millions	Mar. 31, 2023 USD ($)
Other Assets [Member]
Variable Interest Entity [Line Items]
Amortization Method Qualified Affordable Housing Project Investments	$ 401
Other Liabilities [Member]
Variable Interest Entity [Line Items]
Qualified Affordable Housing Project Investments, Commitment	$ 94

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Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
	May 02, 2023	Mar. 31, 2023	Mar. 31, 2022
Dividends declared (in dollars per share)		$ 0.54	$ 0.53
Schedule of Accumulated Other Income (Loss) [Abstract]
Balance, Beginning of Period		$ (836,955)	$ 72,371
Net change in unrealized gain (loss)		124,045	(639,041)
Gain on available for sale securities, net		0	(937)
Interest revenue, Investment securities		16,051	0
Other comprehensive income, before income taxes		140,096	(639,978)
Federal and state income taxes		31,695	(149,781)
Other comprehensive income, net of income taxes		108,401	(490,197)
Balance, End of Period		(728,554)	(417,826)
Accumulated Net Unrealized Gain (Loss) on Available for Sale Securities [Member]
Schedule of Accumulated Other Income (Loss) [Abstract]
Balance, Beginning of Period		(664,618)	69,775
Net change in unrealized gain (loss)		124,045	(639,041)
Gain on available for sale securities, net			(937)
Interest revenue, Investment securities		0
Other comprehensive income, before income taxes		124,045	(639,978)
Federal and state income taxes		28,179	(149,781)
Other comprehensive income, net of income taxes		95,866	(490,197)
Balance, End of Period		(568,752)	(420,422)
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		(172,337)	0
Net change in unrealized gain (loss)		0	0
Gain on available for sale securities, net			0
Interest revenue, Investment securities		16,051
Other comprehensive income, before income taxes		16,051	0
Federal and state income taxes		3,516	0
Other comprehensive income, net of income taxes		12,535	0
Balance, End of Period		(159,802)	0
Accumulated Unrealized Gain (Loss) on Employee Benefit Plans [Member]
Schedule of Accumulated Other Income (Loss) [Abstract]
Balance, Beginning of Period		0	2,596
Net change in unrealized gain (loss)		0	0
Gain on available for sale securities, net			0
Interest revenue, Investment securities		0
Other comprehensive income, before income taxes		0	0
Federal and state income taxes		0	0
Other comprehensive income, net of income taxes		0	0
Balance, End of Period		$ 0	$ 2,596
Subsequent Event [Member]
Dividends Payable, Date Declared	May 02, 2023
Dividends declared (in dollars per share)	$ 0.54
Dividends Payable, Date to be Paid	May 30, 2023
Dividends Payable, Date of Record	May 15, 2023

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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Numerator: [Abstract]
Net income attributable to BOK Financial Corp. shareholders	$ 162,368	$ 62,488
Less: Earnings allocated to participating securities	1,255	451
Numerator for basic earnings per share – income available to common shareholders	161,113	62,037
Effect of reallocating undistributed earnings of participating securities	0	0
Numerator for diluted earnings per share – income available to common shareholders	$ 161,113	$ 62,037
Denominator: [Abstract]
Weighted average shares outstanding (in shares)	66,849,288	68,306,107
Less: Participating securities included in weighted average shares (in shares)	517,513	493,707
Denominator for basic earnings per common share (in shares)	66,331,775	67,812,400
Dilutive effect of employee stock compensation plans (in shares)	0	1,451
Denominator for diluted earnings per common share (in shares)	66,331,775	67,813,851
Basic earnings per share	$ 2.43	$ 0.91
Diluted earnings per share	$ 2.43	$ 0.91

XML

Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting Information [Line Items]
Net interest revenue from external sources	$ 352,348	$ 268,411
Net interest revenue (expense) from internal sources	0	0
Net interest revenue	352,348	268,411
Provision for credit losses	16,000	0
Net interest revenue after provision for credit losses	336,348	268,411
Other operating revenue	177,865	87,856
Other operating expense	305,812	277,618
Net direct contribution	208,401	78,649
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	208,401	78,649
Federal and state income taxes	45,905	16,197
Net income	162,496	62,452
Net income (loss) attributable to non-controlling interests	128	(36)
Net income attributable to BOK Financial Corp. shareholders	162,368	62,488
Average assets	45,982,468	50,561,074
Operating Segments [Member] | Commercial [Member]
Segment Reporting Information [Line Items]
Net interest revenue from external sources	287,646	147,590
Net interest revenue (expense) from internal sources	(21,101)	(10,579)
Net interest revenue	266,545	137,011
Provision for credit losses	76	5,343
Net interest revenue after provision for credit losses	266,469	131,668
Other operating revenue	56,845	57,427
Other operating expense	73,504	65,114
Net direct contribution	249,810	123,981
Gain (loss) on financial instruments, net	(58)	(204)
Change in fair value of mortgage servicing rights	0	0
Gain (loss) on repossessed assets, net	859	1,793
Corporate expense allocations	17,729	16,246
Net income before taxes	232,882	109,324
Federal and state income taxes	56,335	26,980
Net income	176,547	82,344
Net income (loss) attributable to non-controlling interests	0	0
Net income attributable to BOK Financial Corp. shareholders	176,547	82,344
Average assets	28,162,934	29,823,905
Operating Segments [Member] | Consumer [Member]
Segment Reporting Information [Line Items]
Net interest revenue from external sources	21,146	16,915
Net interest revenue (expense) from internal sources	88,235	10,292
Net interest revenue	109,381	27,207
Provision for credit losses	1,184	1,112
Net interest revenue after provision for credit losses	108,197	26,095
Other operating revenue	30,610	33,961
Other operating expense	50,198	48,789
Net direct contribution	88,609	11,267
Gain (loss) on financial instruments, net	(4,673)	(57,895)
Change in fair value of mortgage servicing rights	(6,059)	49,110
Gain (loss) on repossessed assets, net	14	45
Corporate expense allocations	11,618	12,080
Net income before taxes	66,273	(9,553)
Federal and state income taxes	15,586	(2,236)
Net income	50,687	(7,317)
Net income (loss) attributable to non-controlling interests	0	0
Net income attributable to BOK Financial Corp. shareholders	50,687	(7,317)
Average assets	9,934,511	10,273,890
Operating Segments [Member] | Wealth Management [Member]
Segment Reporting Information [Line Items]
Net interest revenue from external sources	20,940	56,231
Net interest revenue (expense) from internal sources	33,166	(465)
Net interest revenue	54,106	55,766
Provision for credit losses	(24)	(71)
Net interest revenue after provision for credit losses	54,130	55,837
Other operating revenue	108,911	25,018
Other operating expense	82,039	74,620
Net direct contribution	81,002	6,235
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	12,386	12,071
Net income before taxes	68,616	(5,836)
Federal and state income taxes	16,189	(1,315)
Net income	52,427	(4,521)
Net income (loss) attributable to non-controlling interests	0	0
Net income attributable to BOK Financial Corp. shareholders	52,427	(4,521)
Average assets	11,663,096	21,323,795
Funds Management and Other [Member]
Segment Reporting Information [Line Items]
Net interest revenue from external sources	22,616	47,675
Net interest revenue (expense) from internal sources	(100,300)	752
Net interest revenue	(77,684)	48,427
Provision for credit losses	14,764	(6,384)
Net interest revenue after provision for credit losses	(92,448)	54,811
Other operating revenue	(18,501)	(28,550)
Other operating expense	100,071	89,095
Net direct contribution	(211,020)	(62,834)
Gain (loss) on financial instruments, net	4,731	58,099
Change in fair value of mortgage servicing rights	6,059	(49,110)
Gain (loss) on repossessed assets, net	(873)	(1,838)
Corporate expense allocations	(41,733)	(40,397)
Net income before taxes	(159,370)	(15,286)
Federal and state income taxes	(42,205)	(7,232)
Net income	(117,165)	(8,054)
Net income (loss) attributable to non-controlling interests	128	(36)
Net income attributable to BOK Financial Corp. shareholders	(117,293)	(8,018)
Average assets	$ (3,778,073)	$ (10,860,516)

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Fees and Commissions Revenue Fees and Commissions (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023		Mar. 31, 2022
Disaggregation of Revenue [Line Items]
Total fees and commissions	$ 185,979		$ 97,635
Fees and commissions revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	185,979		97,635
Fees and commission revenue not from contracts with customers	62,477	[1]	(16,086)	[2]
Fees and commissions revenue from contracts with customers	123,502	[3]	113,721	[4]
Brokerage and trading revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	52,396		(27,079)
Fees and commission revenue not from contracts with customers	39,550	[1]	(40,011)	[2]
Fees and commissions revenue from contracts with customers	12,846	[3]	12,932	[4]
Trading revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	27,598		(54,048)
Fees and commission revenue not from contracts with customers	27,598	[1]	(54,048)	[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	8,354		10,938
Fees and commission revenue not from contracts with customers	8,354	[1]	10,938	[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	3,844		4,610
Fees and commission revenue not from contracts with customers	0	[1]	0	[2]
Fees and commissions revenue from contracts with customers	3,844	[3]	4,610	[4]
Insurance brokerage revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	3,306		3,738
Fees and commission revenue not from contracts with customers	0	[1]	0	[2]
Fees and commissions revenue from contracts with customers	3,306	[3]	3,738	[4]
Investment banking revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	9,294		7,683
Fees and commission revenue not from contracts with customers	3,598	[1]	3,099	[2]
Fees and commissions revenue from contracts with customers	5,696	[3]	4,584	[4]
Transaction card revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	25,621		24,216
Fees and commission revenue not from contracts with customers	0	[1]	0	[2]
Fees and commissions revenue from contracts with customers	25,621	[3]	24,216	[4]
TransFund EFT network revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	21,392		19,023
Fees and commission revenue not from contracts with customers	0	[1]	0	[2]
Fees and commissions revenue from contracts with customers	21,392	[3]	19,023	[4]
Merchant services revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	2,158		3,651
Fees and commission revenue not from contracts with customers	0	[1]	0	[2]
Fees and commissions revenue from contracts with customers	2,158	[3]	3,651	[4]
Corporate card revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	2,071		1,542
Fees and commission revenue not from contracts with customers	0	[1]	0	[2]
Fees and commissions revenue from contracts with customers	2,071	[3]	1,542	[4]
Fiduciary and asset management revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	50,657		46,399
Fees and commission revenue not from contracts with customers	0	[1]	0	[2]
Fees and commissions revenue from contracts with customers	50,657	[3]	46,399	[4]
Personal trust revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	23,945		24,797
Fees and commission revenue not from contracts with customers	0	[1]	0	[2]
Fees and commissions revenue from contracts with customers	23,945	[3]	24,797	[4]
Corporate trust revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	7,660		3,958
Fees and commission revenue not from contracts with customers	0	[1]	0	[2]
Fees and commissions revenue from contracts with customers	7,660	[3]	3,958	[4]
Institutional trust & retirement plan services revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	12,835		12,567
Fees and commission revenue not from contracts with customers	0	[1]	0	[2]
Fees and commissions revenue from contracts with customers	12,835	[3]	12,567	[4]
Investment management services and other revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	6,217		5,077
Fees and commission revenue not from contracts with customers	0	[1]	0	[2]
Fees and commissions revenue from contracts with customers	6,217	[3]	5,077	[4]
Deposit service charges and fees [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	25,968		27,004
Fees and commission revenue not from contracts with customers	0	[1]	0	[2]
Fees and commissions revenue from contracts with customers	25,968	[3]	27,004	[4]
Commercial account service charge revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	13,847		14,094
Fees and commission revenue not from contracts with customers	0	[1]	0	[2]
Fees and commissions revenue from contracts with customers	13,847	[3]	14,094	[4]
Overdraft fee revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	4,873		6,247
Fees and commission revenue not from contracts with customers	0	[1]	0	[2]
Fees and commissions revenue from contracts with customers	4,873	[3]	6,247	[4]
Check card revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	5,639		5,545
Fees and commission revenue not from contracts with customers	0	[1]	0	[2]
Fees and commissions revenue from contracts with customers	5,639	[3]	5,545	[4]
Automated service charge and other deposit fee revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	1,609		1,118
Fees and commission revenue not from contracts with customers	0	[1]	0	[2]
Fees and commissions revenue from contracts with customers	1,609	[3]	1,118	[4]
Mortgage banking revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	14,367		16,650
Fees and commission revenue not from contracts with customers	14,367	[1]	16,650	[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	(633)		5,055
Fees and commission revenue not from contracts with customers	(633)	[1]	5,055	[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	15,000		11,595
Fees and commission revenue not from contracts with customers	15,000	[1]	11,595	[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	16,970		10,445
Fees and commission revenue not from contracts with customers	8,560	[1]	7,275	[2]
Fees and commissions revenue from contracts with customers	8,410	[3]	3,170	[4]
Operating Segments [Member] | Commercial [Member] | Fees and commissions revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	55,835		56,964
Operating Segments [Member] | Commercial [Member] | Brokerage and trading revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	10,185		16,337
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	6,487		12,979
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		0
Operating Segments [Member] | Commercial [Member] | Investment banking revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	3,698		3,358
Operating Segments [Member] | Commercial [Member] | Transaction card revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	24,434		23,170
Operating Segments [Member] | Commercial [Member] | TransFund EFT network revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	20,499		18,153
Operating Segments [Member] | Commercial [Member] | Merchant services revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	2,150		3,641
Operating Segments [Member] | Commercial [Member] | Corporate card revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	1,785		1,376
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	13,133		13,185
Operating Segments [Member] | Commercial [Member] | Commercial account service charge revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	12,871		13,131
Operating Segments [Member] | Commercial [Member] | Overdraft fee revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	25		31
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	237		23
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	8,083		4,272
Operating Segments [Member] | Consumer [Member] | Fees and commissions revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	30,581		33,977
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		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	916		896
Operating Segments [Member] | Consumer [Member] | TransFund EFT network revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	908		886
Operating Segments [Member] | Consumer [Member] | Merchant services revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	8		10
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	12,278		13,295
Operating Segments [Member] | Consumer [Member] | Commercial account service charge revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	499		450
Operating Segments [Member] | Consumer [Member] | Overdraft fee revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	4,828		6,193
Operating Segments [Member] | Consumer [Member] | Check card revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	5,638		5,545
Operating Segments [Member] | Consumer [Member] | Automated service charge and other deposit fee revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	1,313		1,107
Operating Segments [Member] | Consumer [Member] | Mortgage banking revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	14,925		17,131
Operating Segments [Member] | Consumer [Member] | Mortgage production revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	(633)		5,055
Operating Segments [Member] | Consumer [Member] | Mortgage servicing revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	15,558		12,076
Operating Segments [Member] | Consumer [Member] | Other revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	2,462		2,655
Operating Segments [Member] | Wealth Management [Member] | Fees and commissions revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	108,911		25,023
Operating Segments [Member] | Wealth Management [Member] | Brokerage and trading revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	40,444		(40,558)
Operating Segments [Member] | Wealth Management [Member] | Trading revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	27,598		(54,048)
Operating Segments [Member] | Wealth Management [Member] | Customer hedging revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	100		817
Operating Segments [Member] | Wealth Management [Member] | Retail brokerage revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	3,844		4,610
Operating Segments [Member] | Wealth Management [Member] | Insurance brokerage revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	3,306		3,738
Operating Segments [Member] | Wealth Management [Member] | Investment banking revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	5,596		4,325
Operating Segments [Member] | Wealth Management [Member] | Transaction card revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	160		59
Operating Segments [Member] | Wealth Management [Member] | TransFund EFT network revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	(17)		(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	177		76
Operating Segments [Member] | Wealth Management [Member] | Fiduciary and asset management revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	50,678		46,443
Operating Segments [Member] | Wealth Management [Member] | Personal trust revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	23,945		24,797
Operating Segments [Member] | Wealth Management [Member] | Corporate trust revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	7,660		3,958
Operating Segments [Member] | Wealth Management [Member] | Institutional trust & retirement plan services revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	12,835		12,567
Operating Segments [Member] | Wealth Management [Member] | Investment management services and other revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	6,238		5,121
Operating Segments [Member] | Wealth Management [Member] | Deposit service charges and fees [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	556		522
Operating Segments [Member] | Wealth Management [Member] | Commercial account service charge revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	477		513
Operating Segments [Member] | Wealth Management [Member] | Overdraft fee revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	20		23
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	59		(14)
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	17,073		18,557
Funds Management and Other [Member] | Fees and commissions revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	(9,348)		(18,329)
Funds Management and Other [Member] | Brokerage and trading revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	1,767		(2,858)
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	1,767		(2,858)
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		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	111		91
Funds Management and Other [Member] | TransFund EFT network revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	2		1
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	109		90
Funds Management and Other [Member] | Fiduciary and asset management revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	(21)		(44)
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	(21)		(44)
Funds Management and Other [Member] | Deposit service charges and fees [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	1		2
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	1		0
Funds Management and Other [Member] | Automated service charge and other deposit fee revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	0		2
Funds Management and Other [Member] | Mortgage banking revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	(558)		(481)
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	(558)		(481)
Funds Management and Other [Member] | Other revenue [Member]
Disaggregation of Revenue [Line Items]
Total fees and commissions	$ (10,648)		$ (15,039)

[1] Out of scope revenue generally relates to financial instruments or contractual rights and obligations within the scope of other applicable accounting guidance.

[2] Out of scope revenue generally relates to financial instruments or contractual rights and obligations within the scope of other applicable accounting guidance.

[3] In scope revenue represents revenue subject to FASB ASC Topic 606, Revenue from Contracts with Customers.

[4] In scope revenue represents revenue subject to FASB ASC Topic 606, Revenue from Contracts with Customers.

XML

Fair Value Measurements, Fair Value Of Financial Instruments as Measured On a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2023		Dec. 31, 2022		Mar. 31, 2022	Dec. 31, 2021
Assets: [Abstract]
Trading securities	$ 2,294,358		$ 4,464,161
Available for sale securities	11,937,841		11,493,860
Fair value option securities	326,390		296,590
Mortgage servicing rights	299,803		277,608		$ 209,563	$ 163,198
Derviative contracts, net of cash collateral, Assets, Fair value	394,291		880,343
Liabilities: [Abstract]
Derivative contracts, net of cash collateral, Liabilities, Fair Value	510,483		554,900
U.S. government securities [Member]
Assets: [Abstract]
Trading securities	5,618		9,823
Residential agency mortgage-backed securities [Member]
Assets: [Abstract]
Trading securities	2,210,721		4,406,848
Available for sale securities	6,022,708		5,814,496
Fair value option securities	220,083		296,590
Municipal securities [Member]
Assets: [Abstract]
Trading securities	37,455		21,484
Available for sale securities	634,207		624,500
Asset-backed securities [Member]
Assets: [Abstract]
Trading securities	10,194		0
U.S. Treasury [Member]
Assets: [Abstract]
Available for sale securities	914		898
Fair value option securities	106,307		0
Residential non-agency mortgage-backed securities [Member]
Assets: [Abstract]
Available for sale securities	651,351		577,576
Commercial agency mortgage-backed securities [Member]
Assets: [Abstract]
Available for sale securities	4,628,188		4,475,917
Other debt securities [Member]
Assets: [Abstract]
Trading securities	30,370		26,006
Available for sale securities	473		473
Fair Value, Recurring [Member]
Assets: [Abstract]
Trading securities	2,294,358		4,464,161
Available for sale securities	11,937,841		11,493,860
Fair value option securities	326,390
Residential mortgage loans held for sale	74,175	[1]	75,272	[2]
Mortgage servicing rights	299,803	[3]	277,608	[4]
Derviative contracts, net of cash collateral, Assets, Fair value	394,291		880,343
Liabilities: [Abstract]
Derivative contracts, net of cash collateral, Liabilities, Fair Value	510,483		554,900
Fair Value, Recurring [Member] | U.S. government securities [Member]
Assets: [Abstract]
Trading securities	5,618		9,823
Fair Value, Recurring [Member] | Residential agency mortgage-backed securities [Member]
Assets: [Abstract]
Trading securities	2,210,721		4,406,848
Available for sale securities	6,022,708		5,814,496
Fair value option securities	220,083		296,590
Fair Value, Recurring [Member] | Municipal securities [Member]
Assets: [Abstract]
Trading securities	37,455		21,484
Available for sale securities	634,207		624,500
Fair Value, Recurring [Member] | Asset-backed securities [Member]
Assets: [Abstract]
Trading securities	10,194
Fair Value, Recurring [Member] | Other trading securities
Assets: [Abstract]
Trading securities	30,370		26,006
Fair Value, Recurring [Member] | U.S. Treasury [Member]
Assets: [Abstract]
Available for sale securities	914		898
Fair value option securities	106,307
Fair Value, Recurring [Member] | Residential non-agency mortgage-backed securities [Member]
Assets: [Abstract]
Available for sale securities	651,351		577,576
Fair Value, Recurring [Member] | Commercial agency mortgage-backed securities [Member]
Assets: [Abstract]
Available for sale securities	4,628,188		4,475,917
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	4,878		4,970
Available for sale securities	914		898
Fair value option securities	106,307
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	303		2,110
Liabilities: [Abstract]
Derivative contracts, net of cash collateral, Liabilities, Fair Value	3,822		16
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. government securities [Member]
Assets: [Abstract]
Trading securities	4,878		4,970
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] | Asset-backed securities [Member]
Assets: [Abstract]
Trading securities	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	914		898
Fair value option securities	106,307
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	2,289,480		4,459,191
Available for sale securities	11,936,454		11,492,489
Fair value option securities	220,083
Residential mortgage loans held for sale	67,024	[1]	68,054	[2]
Mortgage servicing rights	0	[3]	0	[4]
Derviative contracts, net of cash collateral, Assets, Fair value	393,988		878,233
Liabilities: [Abstract]
Derivative contracts, net of cash collateral, Liabilities, Fair Value	506,661		554,884
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. government securities [Member]
Assets: [Abstract]
Trading securities	740		4,853
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Residential agency mortgage-backed securities [Member]
Assets: [Abstract]
Trading securities	2,210,721		4,406,848
Available for sale securities	6,022,708		5,814,496
Fair value option securities	220,083		296,590
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Municipal securities [Member]
Assets: [Abstract]
Trading securities	37,455		21,484
Available for sale securities	634,207		624,500
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Asset-backed securities [Member]
Assets: [Abstract]
Trading securities	10,194
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other trading securities
Assets: [Abstract]
Trading securities	30,370		26,006
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. Treasury [Member]
Assets: [Abstract]
Available for sale securities	0		0
Fair value option securities	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Residential non-agency mortgage-backed securities [Member]
Assets: [Abstract]
Available for sale securities	651,351		577,576
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Commercial agency mortgage-backed securities [Member]
Assets: [Abstract]
Available for sale securities	4,628,188		4,475,917
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
Fair value option securities	0
Residential mortgage loans held for sale	7,151	[1]	7,218	[2]
Mortgage servicing rights	299,803	[3]	277,608	[4]
Derviative contracts, net of cash collateral, Assets, Fair value	$ 0		$ 0
Liquidity Discount on Mortgage Loans Qualifying for Sale to US Govt Agencies	77.43%		77.55%
Liabilities: [Abstract]
Derivative contracts, net of cash collateral, Liabilities, Fair Value	$ 0		$ 0
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] | Asset-backed securities [Member]
Assets: [Abstract]
Trading 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 option securities	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 77.43% of the unpaid principal balance.

[2] Residential mortgage loans held for sale measured at fair value on a recurring basis using significant unobservable inputs (Level 3) consist of residential mortgage loans intended for sale to U.S. government agencies that fail to meet conforming standards and are valued at 77.55% of the unpaid principal balance.

[3] A reconciliation of the beginning and ending fair value of mortgage servicing rights and disclosures of significant assumptions used to determine fair value are presented in Note 5, Mortgage Banking Activities.3See 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.

[4] A reconciliation of the beginning and ending fair value of mortgage servicing rights and disclosures of significant assumptions used to determine fair value are presented in Note 5, Mortgage Banking Activities.3See 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.

XML

Fair Value Measurements, Fair Value Measured On a Nonrecurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other gains (losses), net	$ 2,251	$ (1,644)
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	1,991	818
Other gains (losses), net	0	0
Fair Value, Nonrecurring [Member] | Real estate and other repossessed assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross charge-offs against allowance for loan losses	0	0
Other gains (losses), net	(101)	106
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	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	0	4,168
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	$ 1,412

XML

Fair Value Measurements Fair Value Measurement, Measured On Non-Recurring Basis, Signfiicant Unobservable Inputs, Quantitative Information (Details) - Fair Value, Nonrecurring [Member] - Fair Value, Inputs, Level 3 [Member] - USD ($) $ in Thousands	Mar. 31, 2023		Mar. 31, 2022
Discounted Cash Flow [Member] | Nonaccruing Loans [Member] | Management knowledge of Industry and non-real estate collateral
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure	$ 14,040		$ 244
Discounted Cash Flow [Member] | Real estate and other repossessed assets [Member] | Management knowledge of Industry and non-real estate collateral
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure	$ 0
Discounted Cash Flow [Member] | Real estate and other repossessed assets [Member] | Marketability adjustments off appraised value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure			$ 400
Minimum [Member] | Nonaccruing Loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value of Impaired Loans as Percentage of Unpaid Principal Balance	88.00%	[1]	3.00%	[2]
Minimum [Member] | Real estate and other repossessed assets [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Marketability adjustments off appraised value			75.00%
Maximum [Member] | Nonaccruing Loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value of Impaired Loans as Percentage of Unpaid Principal Balance	88.00%	[1]	25.00%	[2]
Maximum [Member] | Real estate and other repossessed assets [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Marketability adjustments off appraised value			75.00%
Weighted Average [Member] | Nonaccruing Loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value of Impaired Loans as Percentage of Unpaid Principal Balance	88.00%	[1]	5.00%	[2]
Weighted Average [Member] | Real estate and other repossessed assets [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Marketability adjustments off appraised value			75.00%

[1] Represents fair value as a percentage of the unpaid principal balance.

[2] Represents fair value as a percentage of the unpaid principal balance.

XML

Fair Value Measurements, Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2023		Dec. 31, 2022		Mar. 31, 2022	Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	$ 2,294,358		$ 4,464,161
Debt Securities, Held-to-maturity, gross	2,657,577		2,739,241
Investment securities, Allowance for Credit Loss	(497)	[1]	(558)	[2]
Investment Securities, Amortized Cost, After Allowance for Credit Loss	2,657,080		2,738,683
Available for sale securities	11,937,841		11,493,860
Fair value option securities	326,390		296,590
Residential mortgage loans held for sale	74,175		75,272
Loans	22,750,053		22,557,150
Allowance for loan losses	(249,460)		(235,704)
Loans, net of allowance	22,500,593		22,321,446
Mortgage servicing rights	299,803		277,608		$ 209,563	$ 163,198
Derviative contracts, net of cash collateral, Assets, Fair value	394,291		880,343
Time deposits	1,576,610		1,461,842
Subordinated debentures	131,148		131,205
Derivative contracts, net of cash collateral, Liabilities, Fair Value	510,483		554,900
Commercial [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	14,217,349		14,212,499
Allowance for loan losses	(139,898)		(131,586)
Commercial real estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	4,815,316		4,606,777
Allowance for loan losses	(66,003)		(57,648)
Loans to individuals [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	3,717,388		3,737,874
Allowance for loan losses	(43,559)		(46,470)
U.S. government securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	5,618		9,823
Residential agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	2,210,721		4,406,848
Debt Securities, Held-to-maturity, gross	2,472,291		2,538,565
Available for sale securities	6,022,708		5,814,496
Fair value option securities	220,083		296,590
Municipal securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	37,455		21,484
Debt Securities, Held-to-maturity, gross	153,739		170,629
Available for sale securities	634,207		624,500
Asset-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	10,194		0
U.S. Treasury [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	914		898
Fair value option securities	106,307		0
Residential non-agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	651,351		577,576
Commercial agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Held-to-maturity, gross	17,259		17,259
Available for sale securities	4,628,188		4,475,917
Other debt securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	30,370		26,006
Debt Securities, Held-to-maturity, gross	14,288		12,788
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	792,371		943,810
Interest-bearing cash and cash equivalents	571,613		457,906
Trading securities	2,294,358		4,464,161
Debt Securities, Held-to-maturity, gross	2,448,633		2,514,245
Investment securities, Allowance for Credit Loss	(497)		(558)
Investment Securities, Amortized Cost, After Allowance for Credit Loss	2,448,136		2,513,687
Available for sale securities	11,937,841		11,493,860
Fair value option securities	326,390
Residential mortgage loans held for sale	74,175		75,272
Loans	22,750,053		22,557,150
Allowance for loan losses	(249,460)		(235,704)
Loans, net of allowance	22,500,593		22,321,446
Mortgage servicing rights	299,803		277,608
Derviative contracts, net of cash collateral, Assets, Fair value	394,291		880,343
Deposits with no stated maturity	31,004,137		33,018,863
Time deposits	1,576,610		1,461,842
Other borrowed funds	6,335,609		7,007,285
Subordinated debentures	131,148		131,205
Derivative contracts, net of cash collateral, Liabilities, Fair Value	510,483		554,900
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Commercial [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	14,217,349		14,212,499
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Commercial real estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	4,815,316		4,606,777
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Loans to individuals [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	3,717,388		3,737,874
Carrying (Reported) Amount, Fair Value Disclosure [Member] | U.S. government securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	5,618		9,823
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	2,210,721		4,406,848
Debt Securities, Held-to-maturity, gross	2,264,922		2,315,219
Available for sale securities	6,022,708		5,814,496
Fair value option securities	220,083		296,590
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Municipal securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	37,455		21,484
Debt Securities, Held-to-maturity, gross	153,739		170,629
Available for sale securities	634,207		624,500
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Asset-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	10,194
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Other trading securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	30,370		26,006
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	914		898
Fair value option securities	106,307
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	651,351		577,576
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	15,684		15,609
Available for sale securities	4,628,188		4,475,917
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	14,288		12,788
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	792,371		943,810
Interest-bearing cash and cash equivalents	571,613		457,906
Trading securities	2,294,358		4,464,161
Debt Securities, Held-to-maturity, gross	2,307,686		2,346,768
Investment securities, Allowance for Credit Loss	0		0
Investment Securities, Amortized Cost, After Allowance for Credit Loss	2,307,686		2,346,768
Available for sale securities	11,937,841		11,493,860
Fair value option securities	326,390
Residential mortgage loans held for sale	74,175		75,272
Loans	22,380,424		21,891,223
Allowance for loan losses	0		0
Loans, net of allowance	22,380,424		21,891,223
Mortgage servicing rights	299,803		277,608
Derviative contracts, net of cash collateral, Assets, Fair value	394,291		880,343
Deposits with no stated maturity	31,004,137		33,018,863
Time deposits	1,547,154		1,431,245
Other borrowed funds	6,333,599		7,005,305
Subordinated debentures	125,077		121,497
Derivative contracts, net of cash collateral, Liabilities, Fair Value	510,483		554,900
Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	14,129,311		13,905,765
Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial real estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	4,703,787		4,454,048
Estimate of Fair Value, Fair Value Disclosure [Member] | Loans to individuals [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	3,547,326		3,531,410
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	5,618		9,823
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	2,210,721		4,406,848
Debt Securities, Held-to-maturity, gross	2,118,538		2,143,360
Available for sale securities	6,022,708		5,814,496
Fair value option securities	220,083		296,590
Estimate of Fair Value, Fair Value Disclosure [Member] | Municipal securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	37,455		21,484
Debt Securities, Held-to-maturity, gross	160,866		176,621
Available for sale securities	634,207		624,500
Estimate of Fair Value, Fair Value Disclosure [Member] | Asset-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	10,194
Estimate of Fair Value, Fair Value Disclosure [Member] | Other trading securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	30,370		26,006
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	914		898
Fair value option securities	106,307
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	651,351		577,576
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	14,861		14,588
Available for sale securities	4,628,188		4,475,917
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	13,421		12,199
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	792,371		943,810
Interest-bearing cash and cash equivalents	571,613		457,906
Trading securities	4,878		4,970
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	914		898
Fair value option securities	106,307
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	303		2,110
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	3,822		16
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	4,878		4,970
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] | Asset-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	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	914		898
Fair value option securities	106,307
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	2,289,480		4,459,191
Debt Securities, Held-to-maturity, gross	2,179,978		2,208,253
Investment securities, Allowance for Credit Loss	0		0
Investment Securities, Amortized Cost, After Allowance for Credit Loss	2,179,978		2,208,253
Available for sale securities	11,936,454		11,492,489
Fair value option securities	220,083
Residential mortgage loans held for sale	67,024		68,054
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	393,988		878,233
Deposits with no stated maturity	0		0
Time deposits	0		0
Other borrowed funds	0		0
Subordinated debentures	125,077		121,497
Derivative contracts, net of cash collateral, Liabilities, Fair Value	506,661		554,884
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	740		4,853
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	2,210,721		4,406,848
Debt Securities, Held-to-maturity, gross	2,118,538		2,143,360
Available for sale securities	6,022,708		5,814,496
Fair value option securities	220,083		296,590
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	37,455		21,484
Debt Securities, Held-to-maturity, gross	33,158		38,106
Available for sale securities	634,207		624,500
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Asset-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	10,194
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	30,370		26,006
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 option securities	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	651,351		577,576
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	14,861		14,588
Available for sale securities	4,628,188		4,475,917
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	13,421		12,199
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	127,708		138,515
Investment securities, Allowance for Credit Loss	0		0
Investment Securities, Amortized Cost, After Allowance for Credit Loss	127,708		138,515
Available for sale securities	473		473
Fair value option securities	0
Residential mortgage loans held for sale	7,151		7,218
Loans	22,380,424		21,891,223
Allowance for loan losses	0		0
Loans, net of allowance	22,380,424		21,891,223
Mortgage servicing rights	299,803		277,608
Derviative contracts, net of cash collateral, Assets, Fair value	0		0
Deposits with no stated maturity	31,004,137		33,018,863
Time deposits	1,547,154		1,431,245
Other borrowed funds	6,333,599		7,005,305
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	14,129,311		13,905,765
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	4,703,787		4,454,048
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	3,547,326		3,531,410
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	127,708		138,515
Available for sale securities	0		0
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Asset-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	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 option securities	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 $209 million of net unrealized loss which remains in Accumulated other comprehensive income ("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 as discussed in greater detail following.

[2] Carrying value includes $225 million of net unrealized loss which remains in Accumulated other comprehensive income ("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 as discussed in greater detail following.