International Bancshares (IBOC) 10-K 26 Feb 24 2023 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Feb. 20, 2024	Jun. 30, 2023
Document and Entity Information
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2023
Document Transition Report	false
Entity File Number	0-09439
Entity Registrant Name	INTERNATIONAL BANCSHARES CORPORATION
Entity Incorporation, State or Country Code	TX
Entity Tax Identification Number	74-2157138
Entity Address, Address Line One	1200 San Bernardo Avenue
Entity Address, City or Town	Laredo
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	78042 - 1359
City Area Code	956
Local Phone Number	722-7611
Title of 12(b) Security	Common Stock, $1.00 par value
Trading Symbol	IBOC
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Document Financial Statement Error Correction [Flag]	true
Document Financial Statement Restatement Recovery Analysis [Flag]	true
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
ICFR Auditor Attestation Flag	true
Auditor Name	RSM US LLP
Auditor Firm ID	49
Auditor Location	Austin, Texas
Entity Public Float			$ 2,742,387
Entity Common Stock, Shares Outstanding		62,168,232
Entity Central Index Key	0000315709
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Amendment Flag	false

Consolidated Statements of Cond

Consolidated Statements of Condition - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Assets
Cash and cash equivalents	$ 651,058,000	$ 2,087,724,000
Investment securities:
Held to maturity debt securities (Market value of $3,400 on December 31, 2023 and $3,400 on December 31, 2022)	3,400,000	3,400,000
Available for sale debt securities (Amortized cost of $5,330,814 on December 31, 2023 and $5,018,996 on December 31, 2022)	4,822,341,000	4,417,796,000
Equity securities with readily determinable fair values	5,417,000	5,358,000
Total investment securities	4,831,158,000	4,426,554,000
Loans	8,058,961,000	7,430,603,000
Less allowance for credit losses	(157,069,000)	(125,972,000)
Net loans	7,901,892,000	7,304,631,000
Bank premises and equipment, net	437,094,000	431,612,000
Accrued interest receivable	65,302,000	45,787,000
Other investments	343,452,000	358,910,000
Cash surrender value of life insurance policies	303,486,000	300,589,000
Goodwill	282,532,000	282,532,000
Other assets	250,215,000	263,137,000
Total assets	15,066,189,000	15,501,476,000
Deposits:
Demand-non-interest bearing	5,030,845,000	5,846,055,000
Savings and interest bearing demand	4,368,532,000	4,745,768,000
Time	2,425,177,000	2,068,184,000
Total deposits	11,824,554,000	12,660,007,000
Securities sold under repurchase agreements	530,416,000	431,191,000
Other borrowed funds	10,745,000	10,944,000
Junior subordinated deferrable interest debentures	108,868,000	134,642,000
Other liabilities	143,832,000	219,933,000
Total liabilities	12,618,415,000	13,456,717,000
Shareholders' equity:
Common shares of $1.00 par value. Authorized 275,000,000 shares; issued 96,466,900 shares on December 31, 2023 and 96,420,456 shares on December 31, 2022	96,467,000	96,420,000
Surplus	155,511,000	154,061,000
Retained earnings	3,029,088,000	2,695,567,000
Accumulated other comprehensive loss	(397,889,000)	(470,497,000)
Total shareholders' equity before treasury stock	2,883,177,000	2,475,551,000
Less cost of shares in treasury, 34,391,184 shares on December 31, 2023 and 34,278,617 on December 31, 2022	(435,403,000)	(430,792,000)
Total shareholders' equity	2,447,774,000	2,044,759,000
Total liabilities and shareholders' equity	$ 15,066,189,000	$ 15,501,476,000

Consolidated Statements of Co_2

Consolidated Statements of Condition (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Consolidated Statements of Condition
Held to maturity, Market value (in dollars)	$ 3,400	$ 3,400
Available for sale, Amortized cost (in dollars)	$ 5,330,814	$ 5,018,996
Common shares, par value (in dollars per share)	$ 1	$ 1
Common shares, Authorized shares	275,000,000	275,000,000
Common shares, issued shares	96,466,900	96,420,456
Treasury, shares	34,391,184	34,278,617

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Interest income:
Loans, including fees	$ 620,048,000	$ 402,177,000	$ 359,215,000
Investment securities:
Taxable	132,151,000	74,988,000	34,331,000
Tax-exempt	6,259,000	2,541,000	1,483,000
Other interest income	41,704,000	46,075,000	3,074,000
Total interest income	800,162,000	525,781,000	398,103,000
Interest expense:
Savings deposits	60,337,000	12,686,000	4,110,000
Time deposits	53,158,000	11,157,000	11,655,000
Securities sold under repurchase agreements	14,760,000	2,495,000	621,000
Other borrowings	283,000	6,781,000	7,654,000
Junior subordinated deferrable interest debentures	8,123,000	5,037,000	2,791,000
Total interest expense	136,661,000	38,156,000	26,831,000
Net interest income	663,501,000	487,625,000	371,272,000
Credit loss expense	34,576,000	21,651,000	7,955,000
Net interest income after provision for credit losses	628,925,000	465,974,000	363,317,000
Non-interest income:
Investment securities transactions, net	(3,000)		(16,000)
Other investments income, net	9,601,000	17,538,000	68,807,000
Other income	18,941,000	32,994,000	25,043,000
Total non-interest income	169,941,000	187,134,000	222,326,000
Non-interest expense:
Employee compensation and benefits	134,441,000	127,722,000	123,480,000
Occupancy	25,832,000	25,654,000	26,176,000
Depreciation of bank premises and equipment	21,944,000	21,821,000	25,028,000
Professional fees	14,000,000	11,292,000	7,890,000
Deposit insurance assessments	6,285,000	6,987,000	4,389,000
Net operations, other real estate owned	(3,983,000)	122,000	5,073,000
Amortization of identified intangible assets	0	0	0
Advertising	5,010,000	4,588,000	4,037,000
Software and software maintenance	20,046,000	15,271,000	17,794,000
Other	51,779,000	57,012,000	49,449,000
Total non-interest expense	275,354,000	270,469,000	263,316,000
Income before income taxes	523,512,000	382,639,000	322,327,000
Provision for income taxes	111,744,000	82,407,000	68,405,000
Net income	$ 411,768,000	$ 300,232,000	$ 253,922,000
Basic earnings per common share:
Weighted average number of shares outstanding (in shares)	62,082,827	62,658,414	63,352,737
Net income per common share (in dollars per share)	$ 6.63	$ 4.79	$ 4.01
Fully diluted earnings per common share:
Weighted average number of shares outstanding (in shares)	62,221,601	62,810,234	63,486,366
Net income per common share (in dollars per share)	$ 6.62	$ 4.78	$ 4
Services charges on deposit accounts
Non-interest income:
Service charges	$ 73,933,000	$ 72,781,000	$ 66,205,000
Other service charges, commissions and fees, Banking
Non-interest income:
Service charges	57,923,000	55,253,000	54,280,000
Other service charges, commissions and fees, Non-banking
Non-interest income:
Service charges	$ 9,546,000	$ 8,568,000	$ 8,007,000

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Consolidated Statements of Comprehensive Income
Net Income (Loss)	$ 411,768	$ 300,232	$ 253,922
Other comprehensive loss, net of tax:
Net change in unrealized holding losses on securities available for sale arising during period (net of tax effects of $19,300, $(116,568), and $(14,040))	72,606	(438,517)	(52,818)
Reclassification adjustment for losses on securities available for sale included in net income (net of tax effects of $1, $0, and $3)	2		13
Other comprehensive loss, net of tax	72,608	(438,517)	(52,805)
Comprehensive income (loss)	$ 484,376	$ (138,285)	$ 201,117

Consolidated Statements of Co_3

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Consolidated Statements of Comprehensive Income
Net change in unrealized holding losses on securities available for sale arising during period, tax effects	$ 19,300	$ (116,568)	$ (14,040)
Reclassification adjustment for losses on securities available for sale included in net income, tax effects	$ 1	$ 0	$ 3

Consolidated Statements of Shar

Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Preferred Stock	Common Stock	Surplus	Retained Earnings	Other Comprehensive Income (Loss)	Treasury Stock	Total
Balance at Dec. 31, 2020		$ 96,241	$ 149,334	$ 2,289,626	$ 20,825	$ (378,028)	$ 2,177,998
Balance (in shares) at Dec. 31, 2020	96,241
Increase (decrease) in shareholders' equity
Net Income (Loss)				253,922			253,922
Dividends:
Cash/Payable				(72,838)			(72,838)
Purchase of treasury stock						(716)	(716)
Exercise of stock options		110	2,304				2,414
Exercise of stock options (in shares)	110
Stock compensation expense recognized in earnings			506				506
Other comprehensive loss, net of tax:
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments					(52,805)		(52,805)
Balance at Dec. 31, 2021		96,351	152,144	2,470,710	(31,980)	(378,744)	2,308,481
Balance (in shares) at Dec. 31, 2021	96,351
Increase (decrease) in shareholders' equity
Net Income (Loss)				300,232			300,232
Dividends:
Cash/Payable				(75,375)			(75,375)
Purchase of treasury stock						(52,048)	(52,048)
Exercise of stock options		69	1,468				1,537
Exercise of stock options (in shares)	69
Stock compensation expense recognized in earnings			449				449
Other comprehensive loss, net of tax:
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments					(438,517)		(438,517)
Balance at Dec. 31, 2022		96,420	154,061	2,695,567	(470,497)	(430,792)	2,044,759
Balance (in shares) at Dec. 31, 2022	96,420
Increase (decrease) in shareholders' equity
Net Income (Loss)				411,768			411,768
Dividends:
Cash/Payable				(78,247)			(78,247)
Purchase of treasury stock						(4,611)	(4,611)
Exercise of stock options		47	1,120				1,167
Exercise of stock options (in shares)	47
Stock compensation expense recognized in earnings			330				330
Other comprehensive loss, net of tax:
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments					72,608		72,608
Balance at Dec. 31, 2023		$ 96,467	$ 155,511	$ 3,029,088	$ (397,889)	$ (435,403)	$ 2,447,774
Balance (in shares) at Dec. 31, 2023	96,467

Consolidated Statements of Sh_2

Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Consolidated Statements of Shareholders' Equity
Cash/Payable Dividends (in dollars per share)	$ 1.26	$ 1.20	$ 1.15
Purchase of treasury stock (in shares)	112,567	1,299,344	17,984

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating activities:
Net income	$ 411,768	$ 300,232	$ 253,922
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit loss	34,576	21,651	7,955
Specific reserve, other real estate owned	2,538	1,627	2,655
Depreciation of bank premises and equipment	21,944	21,821	25,028
Gain on sale of bank premises and equipment	(198)	(3,110)	601
Gain on sale of other real estate owned	(7,370)	(2,096)	(170)
Accretion of investment securities discounts	(1,913)	(1,785)	(702)
Amortization of investment securities premiums	6,901	13,907	36,380
Investment securities transactions, net	3		16
Unrealized (gain) loss on equity securities with readily determinable fair values	(59)	721	123
Proceeds from settlements of claims			2,870
Stock based compensation expense	330	449	506
Earnings from affiliates and other investments	(983)	(15,894)	(68,034)
Deferred tax expense	22,950	10,619	3,542
(Increase) decrease in accrued interest receivable	(19,515)	(15,194)	7,288
(Increase) decrease in other assets	(7,297)	12,975	25,220
Increase (decrease) in other liabilities	10,757	42,018	(5,519)
Net cash provided by operating activities	474,432	387,941	291,681
Investing activities:
Proceeds from maturities of securities	51,167	2,200	1,200
Proceeds from sales and calls of available for sale securities	2,045	800	5,890
Purchases of available for sale securities	(1,079,215)	(1,455,249)	(2,856,135)
Principal collected on mortgage backed securities	629,194	756,092	1,612,679
Net (increase) decrease in loans	(632,976)	(228,340)	309,575
Purchases of other investments	(31,256)	(79,669)	(61,783)
Distributions from other investments	12,175	8,886	63,356
Purchases of bank premises and equipment	(27,497)	(19,213)	(10,390)
Proceeds from sales of bank premises and equipment	269	13,496	11,446
Proceeds from sales of other real estate owned	8,888	8,969	8,273
Net cash used in investing activities	(1,067,206)	(992,028)	(915,889)
Financing activities:
Net (decrease) increase in non-interest bearing demand deposits	(815,210)	7,529	1,122,712
Net (decrease) increase in savings and interest bearing demand deposits	(377,236)	155,220	738,043
Net increase (decrease) in time deposits	356,993	(120,619)	35,262
Net increase (decrease) in securities sold under repurchase agreements	99,225	(8,481)	11,524
Net decrease in other borrowed funds	(199)	(425,194)	(189)
Redemption of long-term debt	(25,774)
Purchase of treasury stock	(4,611)	(52,048)	(716)
Proceeds from stock transactions	1,167	1,537	2,414
Payments of cash dividends	(78,247)	(75,375)	(72,838)
Net cash (used in) provided by financing activities	(843,892)	(517,431)	1,836,212
(Decrease) increase in cash and cash equivalents	(1,436,666)	(1,121,518)	1,212,004
Cash and cash equivalents at beginning of period	2,087,724	3,209,242	1,997,238
Cash and cash equivalents at end of period	651,058	2,087,724	3,209,242
Supplemental cash flow information:
Interest paid	117,936	36,355	29,007
Income taxes paid	69,799	22,118	47,394
Non-cash investing and financing activities:
Purchases of available-for-sale securities not yet settled		80,000
Net transfers from loans to other real estate owned	$ 600	835	$ 16,388
Net transfers from bank premises and equipment to other assets		$ 2,476

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2023
Summary of Significant Accounting Policies
Summary of Significant Accounting Policies	(1) Summary of Significant Accounting Policies Our accounting and reporting policies conform to U.S. generally accepted accounting principles (“GAAP”) and to general practices within the banking industry. The following is a description of the more significant of those policies. Consolidation and Basis of Presentation Our consolidated financial statements include the accounts of the International Bancshares Corporation, its wholly owned Subsidiary Banks and its wholly owned non-bank subsidiaries, IBC Trading Company, Premier Tierra Holdings, Inc., IBC Charitable and Community Development Corporation, IBC Capital Corporation and Diamond Beach Holdings, LLC. All significant inter-company balances and transactions have been eliminated in consolidation. We, through our Subsidiary Banks, are primarily engaged in the business of banking, including the acceptance of checking and savings deposits and the making of commercial, real estate, personal, home improvement, automobile, and other installment and term loans. Our primary markets are north, south, central, and southeast Texas and the state of Oklahoma. Each of our Subsidiary Banks is highly active in facilitating international trade along the United States border with Mexico and elsewhere. Although our loan portfolio is diversified, the ability of our debtors to honor their contracts is primarily dependent upon the economic conditions in our trade area. In addition, the investment portfolio is directly impacted by fluctuations in market interest rates. We are subject to the regulations of certain federal agencies as well as the Texas Department of Banking and the Oklahoma Department of Banking and undergo periodic examinations by those regulatory authorities. Such agencies may require certain standards or impose certain limitations based on their judgments or changes in law and regulations. We own one insurance-related subsidiary, IBC Insurance Agency, Inc., a wholly owned subsidiary of our Subsidiary Bank, International Bank of Commerce, Laredo. The insurance-related subsidiary does not conduct underwriting activities. The preparation of the consolidated financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the dates of the statement of condition and income and expenses for the periods. Actual results could differ significantly from those estimates. Material estimates that are particularly susceptible to significant changes in the near-term relate to the determination of the allowance for credit losses (“ACL”). Subsequent Events We have evaluated all events or transactions that occurred through the date we issued these financial statements. During this period, we did not have any material recognizable or non-recognizable subsequent events. Investment Securities We classify debt securities into one of these categories: held-to-maturity, available-for-sale, or trading. Such classifications are reassessed for appropriate classification at each reporting date. Securities that are intended and expected to be held until maturity are classified as “held-to-maturity” and are carried at amortized cost for financial statement reporting. Securities that are not positively expected to be held until maturity but are intended to be held for an indefinite period of time are classified as “available-for-sale” or “trading” and are carried at their fair value. Unrealized holding gains and losses are included in net income for those securities classified as “trading,” while unrealized holding gains and losses related to those securities classified as “available-for-sale” are excluded from net income and reported net of tax as other comprehensive income (loss) and in shareholders’ equity as accumulated other comprehensive income (loss) until realized. Unrealized gains and losses related to equity securities with readily determinable fair values are included in net income. Available-for-sale and held-to-maturity debt securities in an unrealized loss position are evaluated for the underlying cause of the loss. In the event that the deterioration in value is attributable to credit related reasons, then the amount of credit-related impairment would be recorded as a charge to our ACL with subsequent changes in the amount of impairment, up or down, also recorded through our ACL. The exception to this process will occur if we intend to sell an impaired available- for-sale debt security or if we will more likely than not be required to sell a credit impaired available-for-sale debt security prior to the value recovering to the security’s amortized cost. In those situations, the entire credit-related impairment amount would be required to be recognized in earnings. We have evaluated the debt securities classified as available-for-sale and held-to-maturity at December 31, 2023 and have determined that no debt securities in an unrealized loss position are arising from credit related reasons and have therefore not recorded any allowances for debt securities in our ACL for the periods. We did not maintain any trading securities during the three-year period ended December 31, 2023. Mortgage-backed securities held at December 31, 2023 and 2022 represent participating interests in pools of long-term first mortgage loans originated and serviced by the issuers of the securities. Mortgage-backed securities are either issued or guaranteed by the U.S. government or its agencies including Freddie Mac, Fannie Mae, Ginnie Mae or other non-government entities. Investments in residential mortgage-backed securities issued by Ginnie Mae are fully guaranteed by the U. S. government. Investments in residential mortgage-backed securities issued by Freddie Mac and Fannie Mae are not fully guaranteed by the U.S. government; however, we believe that the quality of the bonds is similar to other AAA rated bonds with limited credit risk, particularly given the placement of Fannie Mae and Freddie Mac into conservatorship by the federal government in 2008 and because securities issued by others that are collateralized by residential mortgage-backed securities issued by Fannie Mae or Freddie Mac are rated consistently as AAA rated securities. Market interest rate fluctuations can affect the prepayment speed of principal and the yield on the security. Premiums and discounts are amortized using the level yield or “interest method” over the terms of the securities. Declines in the fair value of held-to-maturity and available-for sale-securities below their cost that are deemed to be other than temporary are reflected in earnings as realized losses. In determining whether other-than-temporary impairment exists, management considers many factors, including (i) the length of time and the extent to which the fair value has been less than cost, (ii) the financial condition and near-term prospects of the issuer, and (iii) our intent to hold and our determination of whether we will more likely than not be required to sell the security prior to a recovery in fair value. If we determine that (i) we intend to sell the security or (ii) it is more likely than not that we will be required to sell the security before it’s anticipated recovery, the other-than-temporary impairment that is recognized in earnings is equal to the difference between the fair value of the security and our amortized cost of the security. If we determine that we (i) do not intend to sell the security and (ii) we will not be more likely than not required to sell the security before it’s anticipated recovery, the other-than-temporary impairment is segregated into its two components (i) the amount of impairment related to credit loss and (ii) the amount of impairment related to other factors. The difference between the present value of the cash flows expected to be collected and the amortized cost is the credit loss recognized through earnings and an adjustment to the cost basis of the security. The amount of impairment related to other factors is included in other comprehensive income (loss). Gains and losses on the sale of securities are recorded on the trade date and are determined using the specific identification method. Equity Securities Provision and Allowance for Credit Losses Our ACL is based on an expected credit loss model that recognizes credit losses over the life of a financial asset. Expected credit losses capture historical information, current conditions, and reasonable and supportable forecasts of future conditions. The ACL is deducted from the amortized cost of an instrument to present the net amount expected to be collected on the financial asset. Our ACL primarily consists of the aggregate ACL estimates of our Subsidiary Banks. The estimates are established through charges to operations in the form of charges to provisions for credit loss expense. Loan losses or recoveries are charged or credited directly to the ACL. The ACL of each Subsidiary Bank is maintained at a level considered appropriate by management, based on estimated current expected credit losses in the current loan portfolio, including information about past events, current conditions, and reasonable and supportable forecasts. Our management continually reviews the ACL of the Subsidiary Banks using the amounts determined from the estimates established on specific doubtful loans, the estimate established on quantitative historical loss percentages, and the estimate based on qualitative current conditions and reasonable and supportable two-year forecasted data. Our methodology reverts to the average lifetime loss-rate beyond the forecast period when we can no longer develop reasonable and supportable forecasts. Should any of the factors considered by management in evaluating the adequacy of the estimate for current expected credit losses change, our estimate of current expected credit losses could also change, which could affect the level of future credit loss expense. While the calculation of our ACL utilizes management’s best judgment and all information reasonably available, the adequacy of the ACL is dependent on a variety of factors beyond our control, including, among other things, the performance of the entire loan portfolio, the economy, government actions, changes in interest rates, and the view of regulatory authorities towards loan classifications. We believe that the allowance for probable loan losses is adequate. The Subsidiary Banks charge-off that portion of any loan which management considers to represent a loss as well as that portion of any other loan which is classified as a “loss” by bank examiners. Commercial, financial, and agricultural or real estate loans are generally considered by management to represent a loss, in whole or part, (i) when an exposure beyond any collateral coverage is apparent, (ii) when no further collection of the portion of the loan so exposed is anticipated based on actual results, (iii) when the credit enhancements, if any, are not adequate, and (iv) when the borrower’s financial condition would indicate so. Generally, unsecured consumer loans are charged-off when 90 days past due. Loans Loans are reported at the principal balance outstanding, net of unearned discounts. Interest income on loans is reported on an accrual basis. Loan fees and costs associated with originating the loans are accreted or amortized over the life of the loan using the interest method. We originate mortgage loans that may subsequently be sold to an unaffiliated third party. The loans are not securitized and if sold, are sold without recourse. Loans held for sale are carried at cost and the principal amount outstanding is not significant to the consolidated financial statements. Doubtful Loans Doubtful loans are those loans where it is probable that all amounts due according to contractual terms of the loan agreement will not be collected. Doubtful loans are measured based on (i) the present value of expected future cash flows discounted at the loan’s effective interest rate; (ii) the loan’s observable market price; or (iii) the fair value of the collateral if the loan is collateral dependent. Substantially all our doubtful loans are measured at the fair value of the collateral. In limited cases, we may use other methods to determine the level of impairment of a loan if such loan is not collateral dependent. Troubled Loan Modifications Non-Accrual Loans The non-accrual loan policy of our Subsidiary Banks is to discontinue the accrual of interest on loans when management determines that it is probable that future interest accruals will be un-collectible. As it relates to consumer loans, management charges-off those loans when the loan is contractually 90 days past due. Under special circumstances, a consumer or non-consumer loan may be more than 90 days delinquent as to interest or principal and not be placed on non-accrual status. This situation generally results when a Subsidiary Bank has a borrower who is experiencing financial difficulties, but not to the extent that requires a restructuring of indebtedness. The majority of this category is composed of loans that are considered to be adequately secured and/or for which there are expected future payments. When a loan is placed on non-accrual status, any interest accrued, not paid is reversed and charged to operations against interest income. As it relates to non-consumer loans that are not 90 days past due, management will evaluate each of these loans to determine if placing the loan on non-accrual status is warranted. Interest income on non-accrual loans is recognized only to the extent payments are received or when, in management’s opinion, the debtor’s financial condition warrants reestablishment of interest accruals. Other Real Estate Owned and Repossessed Assets Other real estate owned is comprised of real estate acquired by foreclosure and deeds in lieu of foreclosure. Other real estate is carried at the lower of the recorded investment in the property or its fair value less estimated costs to sell such property (as determined by independent appraisal). Prior to foreclosure, the value of the underlying loan is written down to the fair value of the real estate to be acquired by a charge to the ACL, if necessary. Any subsequent write-downs are charged against other non-interest expense through a valuation allowance. Other real estate owned totaled approximately $26,728,000 and $30,144,000 at December 31, 2023 and 2022, respectively. Other real estate owned is included in other assets. Repossessed assets consist primarily of non-real estate assets acquired by foreclosure. Prior to foreclosure, the value of the underlying loan is written down to the fair value of the asset to be repossessed by a charge to the ACL, if necessary. Repossessed assets are included in other assets on the consolidated financial statements and totaled approximately $236,000 and $4,637,000 at December 31, 2023 and 2022, respectively. Bank Premises and Equipment Bank premises and equipment are stated at cost less accumulated depreciation. Depreciation is computed on straight-line and accelerated methods over the estimated useful lives of the assets. Repairs and maintenance are charged to operations as incurred and expenditures for renewals and betterments are capitalized. We primarily own all the property we occupy, with the exception of certain branches operating in grocery store or retail shopping centers and certain ATM locations, which are all under operating leases as classified under guidance prior to the issuance of ASU 2016-02, “Leases (Topic 842).” Other Investments Other investments include equity investments in non-financial companies, as well as equity securities with no readily determinable fair market value. Equity investments are accounted for using the equity method of accounting. Equity securities with no readily determinable fair value are accounted for using the cost method. Revenue Recognition Income Taxes Deferred income tax assets and liabilities are determined using the asset and liability method. Under this method, the net deferred tax asset or liability is determined based on the tax effects of the differences between the book and tax basis of the various balance sheet assets and liabilities and gives current recognition to changes in tax rates and laws. We file a consolidated federal income tax return with our subsidiaries. Recognition of deferred tax assets is based on management’s assessment that the benefit related to certain temporary differences, tax operating loss carry forwards, and tax credits are more likely than not to be realized. A valuation allowance is recorded for the amount of the deferred tax items for which it is more likely than not that the tax benefits will not be realized. We evaluate uncertain tax positions at the end of each reporting period. We may recognize the tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. The tax benefit recognized in the financial statements from any such a position is measured based on the largest benefit that has a greater than fifty percent likelihood of being realized upon ultimate settlement. As of December 31, 2023 and 2022, respectively, after evaluating all uncertain tax positions, we have recorded no liability for unrecognized tax benefits at the end of the reporting period. We would recognize any interest accrued on unrecognized tax benefits as other interest expense and penalties as other non-interest expense. During the years ended December 31, 2023, 2022, and 2021, we recognized no interest expense or penalties related to uncertain tax positions. We file consolidated tax returns in the U.S. federal jurisdiction and various state jurisdictions. We are no longer subject to U.S. federal or state income tax examinations by tax authorities for years before 2020. Stock Options and Stock Appreciation Rights Compensation expense for stock-based awards is based on the market price of the stock on the measurement date, which is generally the date of grant, and is recognized ratably over the service period of the award. The fair value of stock options and stock appreciation rights granted was estimated using a Black-Scholes-Merton pricing model. These models were developed for use in estimating the fair value of publicly traded options and stock appreciation rights that have no vesting restrictions and are fully transferable. Additionally, these models require the input of highly subjective assumptions. Because our employee stock options and stock appreciation rights have characteristics significantly different from those of publicly traded options and appreciation rights, and because changes in the subjective input assumptions can materially affect the fair value estimate, in management’s opinion, the Black-Scholes-Merton pricing models do not necessarily provide a reliable single measure of the fair value of our stock options and stock appreciation rights. Net Income Per Share Basic Earnings Per Share (“EPS”) is calculated by dividing net income by the weighted average number of common shares outstanding. The computation of diluted EPS assumes the issuance of common shares for all dilutive potential common shares outstanding during the reporting period. The dilutive effect of stock options is considered in earnings per share calculations, if dilutive, using the treasury stock method. Goodwill and Identified Intangible Assets Goodwill represents the excess of costs over fair value of assets of businesses acquired. Goodwill is tested for impairment at least annually or on an interim basis if an event triggering impairment may have occurred. As of October 1, 2023, after completing goodwill testing, we have determined that no goodwill impairment exists. Identified intangible assets are acquired assets that lack physical substance but can be distinguished from goodwill because of contractual or other legal rights or because the asset is capable of being sold or exchanged either on its own or in combination with a related contract, asset, or liability. Our identified intangible assets relate to core deposits and contract rights. As of December 31, 2023, we have determined that no impairment of identified intangibles exists. Identified intangible assets with definite useful lives are amortized on an accelerated basis over their estimated life. See Note 6—Goodwill and Other Intangible Assets. Impairment of Long-Lived Assets Long-lived assets, such as property, plant, and equipment, and purchased intangibles subject to amortization, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying value of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying value of the asset to the estimated undiscounted future cash flows expected to be generated by the asset. If the carrying value of an asset exceeds its estimated future cash flows, an impairment charge is recognized by the amount by which the carrying value of the asset exceeds the fair value of the asset. Assets to be disposed of would be separately presented in the statement of condition and reported at the lower of the carrying value or fair value less costs to sell and are no longer depreciated. The assets and liabilities of a disposed group classified as held for sale would be presented separately in the appropriate asset and liability sections of the statement of condition. Consolidated Statements of Cash Flows For purposes of the consolidated statements of cash flows, we consider all short-term investments with a maturity at date of purchase of three months or less to be cash equivalents. Also, we report transactions related to deposits and loans to customers on a net basis. Accounting for Transfers and Servicing of Financial Assets We account for transfers and servicing of financial assets and extinguishments of liabilities based on the application of a financial-components approach that focuses on control. After a transfer of financial assets, we recognize the financial and servicing assets we control and liabilities we have incurred, derecognize financial assets when control has been surrendered and derecognize liabilities when extinguished. We have retained mortgage servicing rights in connection with the sale of mortgage loans. Because we may not initially identify loans as originated for resale, all loans are initially treated as held for investment. The value of the mortgage servicing rights are reviewed periodically for impairment and are amortized in proportion to, and over the period of estimated net servicing income or net servicing losses. The value of the mortgage servicing rights is not significant to the consolidated statements of condition. Segments of an Enterprise and Related Information We operate as one segment. The operating information used by our chief executive officer for purposes of assessing performance and making operating decisions is the consolidated financial statements presented in this report. We have five active operating subsidiaries, namely, the Subsidiary Banks. We apply the provisions of ASC Topic 280, “Segment Reporting,” in determining our reportable segments and related disclosures. Comprehensive Income (Loss) Comprehensive income (loss) consists of net income and other comprehensive income (loss). Other comprehensive income (loss) includes unrealized gains and losses on securities available for sale. Advertising Advertising costs are expensed as incurred. Reclassifications Certain amounts in the prior year’s presentations have been reclassified to conform to the current presentation. These reclassifications had no effect on previously reported net income or shareholders’ equity. New Accounting Standards In December 2019, the FASB issued Accounting Standards Update No. 2019-12, to ASC 740, “Income Taxes.” The update amends existing guidance with the intention of simplifying the accounting for income taxes. Specifically, the update removes some exceptions in existing guidance around intraperiod tax allocations, recognition of deferred tax liabilities for certain changes in investments in foreign subsidiaries and to the general methodology for calculating taxes on interim periods when year to date losses exceed the anticipated loss for the year. Additionally, the update clarifies and provides more guidance with respect to the classification of franchise or similar taxes, requirements to evaluate when a step up in the tax basis of goodwill should be considered, eliminates the requirement that a consolidated entity allocate a portion of current and deferred tax expense to a legal entity that is not subject to tax, requires that an entity reflect the effect of changes in tax laws and tax rates in the effective tax rate computed in the interim period that includes the enactment date and makes minor changes for taxes related to employee stock ownership plans and investments in qualified affordable housing projects accounted for using the equity method. The update is effective for fiscal years beginning after December 15, 2020. The adoption of the update did not have a significant impact on our consolidated financial statements. investments in leases. We adopted the provisions of ASU 2022-02 on January 1, 2023 and it did not have a significant impact on our consolidated financial statements.

Investment Securities, Equity S

Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments	12 Months Ended
	Dec. 31, 2023
Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments
Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments	(2) Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments Available-for-sale and held-to-maturity debt securities in an unrealized loss position are evaluated for the underlying cause of the loss. In the event that the deterioration in value is attributable to credit related reasons, then the amount of credit-related impairment would be recorded as a charge to our ACL with subsequent changes in the amount of impairment, up or down, also recorded through our ACL. The exception to this process will occur if we intend to sell an impaired available-for-sale debt security or if we will more likely than not be required to sell a credit impaired available-for-sale debt security prior to the value recovering to the security’s amortized cost. In those situations, the entire credit-related impairment amount would be required to be recognized in earnings. We have evaluated the debt securities classified as available-for-sale and held-to-maturity at December 31, 2023 and December 31, 2022, and have determined that no debt securities in an unrealized loss position are arising from credit related reasons, and have therefore not recorded any allowances for debt securities in our ACL for the period. Unrealized gains and losses related to equity securities with readily determinable fair values are included in net income. The amortized cost and estimated fair value by type of investment security at December 31, 2023 are as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Held to Maturity ​ ​ ​ ​ ​ ​ Gross ​ Gross ​ ​ ​ ​ ​ ​ ​ ​ ​ Amortized ​ unrealized ​ unrealized ​ Estimated ​ Carrying ​ ​ ​ cost ​ gains ​ losses ​ fair value ​ value ​ ​ ​ (Dollars in Thousands) ​ Other securities $ 3,400 $ — $ — $ 3,400 $ 3,400 ​ Total investment securities ​ $ 3,400 ​ $ — ​ $ — ​ $ 3,400 ​ $ 3,400 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Available for Sale Debt Securities ​ ​ ​ ​ ​ ​ Gross ​ Gross ​ ​ ​ ​ ​ ​ ​ ​ ​ Amortized ​ unrealized ​ unrealized ​ Estimated ​ Carrying ​ ​ ​ cost ​ gains ​ losses ​ fair value ​ value (1) ​ ​ ​ (Dollars in Thousands) ​ Residential mortgage-backed securities ​ $ 5,169,813 ​ $ 9,541 ​ $ (519,255) ​ $ 4,660,099 ​ $ 4,660,099 ​ Obligations of states and political subdivisions ​ 161,001 ​ 1,602 ​ (361) ​ 162,242 ​ 162,242 ​ Total investment securities ​ $ 5,330,814 ​ $ 11,143 ​ $ (519,616) ​ $ 4,822,341 ​ $ 4,822,341 ​ ​ (1) Included in the carrying value of residential mortgage- backed securities are $959,421 of mortgage-backed securities issued by Ginnie Mae and $3,700,678 of mortgage-backed securities issued by Fannie Mae and Freddie Mac The amortized cost and estimated fair value of investment securities at December 31, 2023, by contractual maturity, are shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to prepay obligations with or without prepayment penalties. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Held to Maturity ​ Available for Sale ​ ​ ​ Amortized ​ Estimated ​ Amortized ​ Estimated ​ ​ ​ Cost ​ fair value ​ Cost ​ fair value ​ ​ ​ (Dollars in Thousands) ​ Due in one year or less $ 2,075 $ 2,075 $ — $ — ​ Due after one year through five years ​ 1,325 ​ 1,325 ​ — ​ ​ — ​ Due after five years through ten years ​ — ​ — ​ 440 ​ 440 ​ Due after ten years ​ — ​ — ​ 160,561 ​ 161,802 ​ Residential mortgage-backed securities ​ — ​ — ​ 5,169,813 ​ 4,660,099 ​ Total investment securities ​ $ 3,400 ​ $ 3,400 ​ $ 5,330,814 ​ $ 4,822,341 ​ ​ The amortized cost and estimated fair value by type of investment security at December 31, 2022 are as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Held to Maturity ​ ​ ​ ​ ​ ​ Gross ​ Gross ​ ​ ​ ​ ​ ​ ​ ​ ​ Amortized ​ unrealized ​ unrealized ​ Estimated ​ Carrying ​ ​ ​ cost ​ gains ​ losses ​ fair value ​ value ​ ​ ​ (Dollars in Thousands) ​ Other securities $ 3,400 $ — $ — $ 3,400 $ 3,400 ​ Total investment securities ​ $ 3,400 ​ $ — ​ $ — ​ $ 3,400 ​ $ 3,400 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Available for Sale ​ ​ ​ ​ ​ ​ Gross ​ Gross ​ Estimated ​ ​ ​ ​ ​ ​ Amortized ​ unrealized ​ unrealized ​ fair ​ Carrying ​ ​ ​ cost ​ gains ​ losses ​ value ​ value (1) ​ ​ ​ (Dollars in Thousands) ​ U.S. Treasury securities ​ $ 49,752 ​ $ — $ (359) ​ $ 49,393 ​ $ 49,393 ​ Residential mortgage-backed securities ​ 4,805,735 ​ 3,145 ​ ​ (599,668) ​ 4,209,212 ​ 4,209,212 ​ Obligations of states and political subdivisions ​ 163,509 ​ 927 ​ (5,245) ​ 159,191 ​ 159,191 ​ Total investment securities ​ $ 5,018,996 ​ $ 4,072 ​ $ (605,272) ​ $ 4,417,796 ​ $ 4,417,796 ​ (1) Included in the carrying value of residential mortgage- backed securities are $681,121 of mortgage-backed securities issued by Ginnie Mae, $3,528,091 of mortgage-backed securities issued by Fannie Mae and Freddie Mac Residential mortgage-backed securities are securities issued by Freddie Mac, Fannie Mae, Ginnie Mae or non-government entities. Investments in residential mortgage-backed securities issued by Ginnie Mae are fully guaranteed by the U.S. government. Investments in mortgage-backed securities issued by Freddie Mac and Fannie Mae are not fully guaranteed by the U.S. government; however, we believe that the quality of the bonds is similar to other AAA rated bonds with limited credit risk, particularly given the placement of Fannie Mae and Freddie Mac into conservatorship by the federal government in early September 2008 and because securities issued by others that are collateralized by residential mortgage-backed securities issued by Fannie Mae and Freddie Mac are rated consistently as AAA rated securities. The amortized cost and fair value of available for sale investment securities pledged to qualify for fiduciary powers, to secure public monies as required by law, repurchase agreements and short-term fixed borrowings was $1,836,634,000 and $1,598,853,000, respectively, at December 31, 2023. Proceeds from the sale and call of securities available-for-sale were $2,045,000, $800,000, and $5,890,000 during 2023, 2022 and 2021, respectively, which amounts included $0, $0 and $0 of mortgage-backed securities. Gross gains of $0, $0 and $0, and gross losses of $3,000, $0 and $16,000 were realized on the sales and calls in 2023, 2022 and 2021, respectively. Gross unrealized losses on investment securities and the fair value of the related securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2023 were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Less than 12 months ​ 12 months or more ​ Total ​ ​ ​ ​ ​ ​ Unrealized ​ ​ ​ ​ Unrealized ​ ​ ​ ​ Unrealized ​ ​ ​ Fair Value ​ Losses ​ Fair Value ​ Losses ​ Fair Value ​ Losses ​ ​ ​ (Dollars in Thousands) ​ Available for sale: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential mortgage-backed securities $ 577,448 $ (8,267) $ 3,456,349 $ (510,988) $ 4,033,797 $ (519,255) ​ Obligations of states and political subdivisions ​ 651 ​ (1) ​ 64,373 ​ (360) ​ 65,024 ​ (361) ​ ​ ​ $ 578,099 ​ $ (8,268) ​ $ 3,520,722 ​ $ (511,348) ​ $ 4,098,821 ​ $ (519,616) ​ ​ Gross unrealized losses on investment securities and the fair value of the related securities, aggregated by investment category and length of time that individual securities have been in a continuous loss position, at December 31, 2022 were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Less than 12 months ​ 12 months or more ​ Total ​ ​ ​ ​ ​ Unrealized ​ ​ ​ ​ Unrealized ​ ​ ​ ​ Unrealized ​ ​ Fair Value ​ Losses ​ Fair Value ​ Losses ​ Fair Value ​ Losses ​ ​ (Dollars in Thousands) Available for sale: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. Treasury securities ​ $ 49,394 ​ $ (359) ​ $ — ​ $ — ​ $ 49,394 ​ $ (359) Residential mortgage-backed securities ​ 1,357,905 ​ (87,815) ​ 2,566,975 ​ (511,853) ​ 3,924,880 ​ (599,668) Obligations of states and political subdivisions ​ 118,772 ​ (5,245) ​ — ​ — ​ 118,772 ​ (5,245) ​ ​ $ 1,526,071 ​ $ (93,419) ​ $ 2,566,975 ​ $ (511,853) ​ $ 4,093,046 ​ $ (605,272) ​ The unrealized losses on investments in residential mortgage-backed securities are primarily caused by changes in market interest rates. We have no intent to sell and more likely than not be required to sell before a market price recovery or maturity of the securities; therefore, it is our conclusion that the investments in residential mortgage-backed securities issued by Freddie Mac, Fannie Mae, and Ginnie Mae are not considered other-than-temporarily impaired. ​ ​ ​ ​ ​ ​ ​ ​ Year Ended ​ ​ December 31, 2023 ​ ​ (Dollars in Thousands) ​ ​ ​ Net gains recognized during the period on equity securities $ ​ 59 Less: Net gains and (losses) recognized during the period on equity securities sold during the period ​ ​ — ​ ​ ​ ​ ​ Unrealized gains recognized during the reporting period on equity securities still held at the reporting date ​ $ ​ 59 ​ ​ ​ ​ ​ ​ ​ ​ Year Ended ​ ​ December 31, 2022 ​ ​ (Dollars in Thousands) ​ ​ ​ Net losses recognized during the period on equity securities $ ​ (721) Less: Net gains and (losses) recognized during the period on equity securities sold during the period ​ ​ — ​ ​ ​ ​ ​ Unrealized losses recognized during the reporting period on equity securities still held at the reporting date ​ $ ​ (721) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended ​ ​ December 31, 2021 ​ ​ (Dollars in Thousands) ​ ​ ​ Net losses recognized during the period on equity securities $ ​ (123) Less: Net gains and (losses) recognized during the period on equity securities sold during the period ​ ​ — ​ ​ ​ ​ ​ Unrealized losses recognized during the reporting period on equity securities still held at the reporting date ​ $ ​ (123) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Loans

Loans	12 Months Ended
	Dec. 31, 2023
Loans
Loans	(3) Loans A summary of loans, by loan type at December 31, 2023 and 2022 is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ December 31, ​ ​ ​ 2023 ​ 2022 ​ ​ ​ (Dollars in Thousands) ​ Commercial, financial and agricultural $ 4,802,622 $ 4,373,373 ​ Real estate - mortgage ​ 938,901 ​ 865,994 ​ Real estate - construction ​ 2,091,622 ​ 1,989,669 ​ Consumer ​ 45,121 ​ 41,592 ​ Foreign ​ 180,695 ​ 159,975 ​ Total loans ​ $ 8,058,961 ​ $ 7,430,603 ​ ​

Allowance for Credit Losses

Allowance for Credit Losses	12 Months Ended
	Dec. 31, 2023
Allowance for Credit Losses
Allowance for Credit Losses	(4) Allowance for Credit Losses We adopted the provisions of ASU 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments on January 1, 2020 on a modified retrospective basis. Results and information regarding our ACL included in this Note are calculated and presented in accordance with that accounting standards update. Results and information prior to January 1, 2020 were calculated and presented in accordance with previously applicable U.S. GAAP. ​ ASU 2016-13 replaces the long-standing incurred-loss model with a current expected credit loss model (“CECL”) that recognizes credit losses over the life of a financial asset. Using the CECL methodology, expected credit losses capture historical information, current conditions, and reasonable and supportable forecasts of future conditions. The ACL is deducted from the amortized cost of an instrument to present the net amount expected to be collected on the financial asset. Our ACL primarily consists of the aggregate ACL estimates of our Subsidiary Banks. The estimates are established through charges to operations in the form of charges to provisions for credit loss expense. Loan losses or recoveries are charged or credited directly to the ACL. The ACL of each Subsidiary Bank is maintained at a level considered appropriate by management, based on estimated current expected credit losses in the current loan portfolio, including information about past events, current conditions, and reasonable and supportable forecasts. ​ The estimation of the ACL is based on a loss-rate methodology that measures lifetime losses on loan pools that have similar risk characteristics. Loans that do not have similar risk characteristics are evaluated on an individual basis. The segmentation of the loan portfolio into pools requires a balancing process between capturing similar risk characteristics and containing sufficient loss history to provide meaningful results. Our segmentation starts at the general loan category with further sub-segmentation based on collateral types that may be of meaningful size and/or may contain sufficient differences in risk characteristics based on management’s judgement that would warrant further segmentation. The general loan categories along with primary risk characteristics used in our calculation are as follows: Commercial and industrial loans. Construction and land development loans. Commercial real estate loans. 1-4 family mortgages. ​ Consumer loans. ​ The loan pools are further broken down using a risk-based segmentation based on internal classifications for commercial loans and past due status for consumer mortgage loans. Non-mortgage consumer loans are evaluated as one segment. On a weekly basis, commercial loan past due reports are reviewed by the credit quality committee to determine if a loan has any potential problems and if a loan should be placed on our internal Watch List report. Additionally, our credit department reviews the majority of our loans for proper internal classification purposes regardless of whether they are past due and segregates any loans with potential problems for further review. The credit department will discuss the potential problem loans with the servicing loan officers to determine any relevant issues that were not discovered in the evaluation. Also, an analysis of loans that is provided through examinations by regulatory authorities is considered in the review process. After the above analysis is completed, we will determine if a loan should be placed on an internal Watch List report because of issues related to the analysis of the credit, credit documents, collateral, and/or payment history. Our internal Watch List report is segregated into the following categories: (i) Pass, (ii) Economic Monitoring, (iii) Special Review, (iv) Watch List—Pass, or (v) Watch List—Substandard, and (vi) Watch List—Doubtful. The loans placed in the Special Review category and lower rated credits reflect our opinion that the loans reflect potential weakness which require monitoring on a more frequent basis. Credits in those categories are reviewed and discussed on a regular basis, no less frequently than quarterly, with the credit department and the lending staff to determine if a change in category is warranted. The loans placed in the Watch List—Pass category and lower rated credits reflect our opinion that the credit contains weaknesses which represent a greater degree of risk, which warrant “extra attention.” Credits in this category are reviewed and discussed on a regular basis with the credit department and the lending staff to determine if a change in category is warranted. The loans placed in the Watch List—Substandard category are considered to be potentially inadequately protected by the current sound worth and debt service capacity of the borrower or of any pledged collateral. These credit obligations, even if apparently protected by collateral value, have shown defined weaknesses related to adverse financial, managerial, economic, market, or political conditions which may jeopardize repayment of principal and interest. Furthermore, there is the possibility that we may sustain some future loss if such weaknesses are not corrected. The loans placed in the Watch List—Doubtful category have shown defined weaknesses and it is likely, based on current information and events, that we will be unable to collect all principal and/or interest amounts contractually due. Watch List—Doubtful loans are placed on non-accrual when they are moved to that category. For the purposes of the ACL, in order to maintain segments with sufficient history for meaningful results, the credits in the Pass and Economic Monitoring categories are aggregated, the credits in the Special Review and Watch List—Pass credits are aggregated, and the credits in the Watch List—Substandard category remain in their own segment. For loans that are classified as Watch List—Doubtful, management evaluates these credits in accordance with ASC 310-10, “Receivables,” and, if deemed necessary, a specific reserve is allocated to the loan. The specific reserve allocated under ASC 310-10 is based on (i) the present value of expected future cash flows discounted at the loan’s effective interest rate; (ii) the loan’s observable market price; or (iii) the net realizable value of the fair value of the collateral if the loan is collateral dependent. Substantially all of our loans evaluated as Watch List—Doubtful under ASC 310-10 are measured using the fair value of collateral method. In rare cases, we may use other methods to determine the specific reserve of a loan under ASC 310-10 if such loan is not collateral dependent. Within each collectively evaluated pool, the robustness of the lifetime historical loss-rate is evaluated and, if needed, is supplemented with peer loss rates through a model risk adjustment. Certain qualitative loss factors are then evaluated to incorporate management’s two-year reasonable and supportable forecast period followed by a reversion to the pool’s average lifetime loss-rate. Those qualitative loss factors are: (i) trends in portfolio volume and composition, (ii) volume and trends in classified loans, delinquencies, non-accruals and troubled loan modifications, (iii) concentration risk, (iv) trends in underlying collateral value, (v) changes in policies, procedures, and strategies, and (vi) economic conditions. Qualitative factors also include potential losses stemming from operational risk factors arising from fraud, natural disasters, pandemics, geopolitical events and large loans. The large loan operational risk factor was added beginning in the second quarter of 2023. Because of the magnitude of large loans, they pose a higher risk of default. Recognizing this risk and establishing an operational risk factor to capture that risk, is prudent action in the current economic environment. Large loans are usually part of a larger relationship with collateral that is pledged across the relationship. Defaulting on a larger loan may therefore jeopardize an entire collateral relationship. The current economic environment has created challenges for borrowers to service their debt. Increasing cap rates, elevated office vacancies, an upward trend in apartment vacancies and significant increases in interest rates are all contributing to the elevated risk in large loans. Should any of the factors considered by management in evaluating the adequacy of the ACL change, our estimate could also change, which could affect the level of future credit loss expense. We have elected to not measure an ACL for accrued interest receivable given our timely approach in identifying and writing off uncollectible accrued interest. An ACL for off-balance sheet exposure is derived from a projected usage rate of any unfunded commitment multiplied by the historical loss rate, plus model risk adjustment, if any, of the on-balance sheet loan pools. Our management continually reviews the ACL of the Subsidiary Banks using the amounts determined from the estimates established on specific doubtful loans, the estimate established on quantitative historical loss percentages, and the estimate based on qualitative current conditions and reasonable and supportable two-year forecasted data. Our methodology reverts to the average lifetime loss-rate beyond the forecast period when we can no longer develop reasonable and supportable forecasts. Should any of the factors considered by management in evaluating the adequacy of the estimate for current expected credit losses change, our estimate of current expected credit losses could also change, which could affect the level of future credit loss expense. While the calculation of our ACL utilizes management’s best judgment and all information reasonably available, the adequacy of the ACL is dependent on a variety of factors beyond our control, including, among other things, the performance of the entire loan portfolio, the economy, government actions, changes in interest rates, and the view of regulatory authorities towards loan classifications. A summary of the changes in the allowance for probable loan losses by loan class is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 ​ ​ Domestic ​ ​ ​ ​ Foreign ​ ​ ​ ​ ​ ​ ​ ​ Commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ other Commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ construction & real estate: ​ Commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ land ​ farmland & ​ real estate: ​ Residential: ​ Residential: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial ​ development ​ commercial ​ multifamily ​ first lien ​ junior lien ​ Consumer ​ Foreign ​ Total ​ ​ (Dollars in Thousands) ​ Balance at December 31, 2022 $ 26,728 ​ $ 44,684 ​ $ 36,474 ​ $ 3,794 ​ $ 4,759 ​ $ 8,284 ​ $ 281 ​ $ 968 ​ $ 125,972 ​ Losses charged to allowance ​ (9,664) ​ — ​ ​ — ​ — ​ (43) ​ (298) ​ (179) ​ — ​ (10,184) ​ Recoveries credited to allowance ​ 5,433 ​ 837 ​ 143 ​ — ​ 16 ​ 260 ​ 16 ​ — ​ 6,705 ​ Net losses charged to allowance ​ (4,231) ​ 837 ​ 143 ​ — ​ (27) ​ (38) ​ (163) ​ — ​ (3,479) ​ Provision (credit) charged to operations ​ 13,053 ​ ​ 9,770 ​ 6,086 ​ 1,294 ​ 1,080 ​ 2,778 ​ 200 ​ 315 ​ 34,576 ​ Balance at December 31, 2023 ​ $ 35,550 ​ $ 55,291 ​ $ 42,703 ​ $ 5,088 ​ $ 5,812 ​ $ 11,024 ​ $ 318 ​ $ 1,283 ​ $ 157,069 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022 ​ ​ Domestic ​ Foreign ​ ​ ​ ​ ​ ​ ​ ​ Commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ other Commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ construction & real estate: ​ Commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ land ​ farmland & ​ real estate: ​ Residential: ​ Residential: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial development ​ commercial ​ multifamily ​ first lien ​ junior lien ​ Consumer ​ Foreign ​ Total ​ ​ (Dollars in Thousands) ​ Balance at December 31, 2021 $ 23,178 ​ $ 35,390 ​ $ 35,654 ​ $ 3,291 ​ $ 4,073 ​ $ 7,754 ​ $ 272 ​ $ 762 $ 110,374 ​ Losses charged to allowance ​ (9,050) ​ (2) ​ ​ (16) ​ — ​ (160) ​ (28) ​ (223) ​ — ​ (9,479) ​ Recoveries credited to allowance ​ 2,894 ​ 123 ​ 27 ​ — ​ 240 ​ 104 ​ 38 ​ — ​ 3,426 ​ Net losses charged to allowance ​ (6,156) ​ 121 ​ 11 ​ — ​ 80 ​ 76 ​ (185) ​ — ​ (6,053) ​ Provision (credit) charged to operations ​ 9,706 ​ ​ 9,173 ​ 809 ​ 503 ​ 606 ​ 454 ​ 194 ​ 206 ​ 21,651 ​ Balance at December 31, 2022 ​ $ 26,728 ​ $ 44,684 ​ $ 36,474 ​ $ 3,794 ​ $ 4,759 ​ $ 8,284 ​ $ 281 ​ $ 968 ​ $ 125,972 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2021 ​ ​ Domestic ​ Foreign ​ ​ ​ ​ ​ ​ ​ ​ Commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ other Commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ construction & real estate: ​ Commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ land ​ farmland & ​ real estate: ​ Residential: ​ Residential: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial development ​ commercial ​ multifamily ​ first lien ​ junior lien ​ Consumer ​ Foreign ​ Total ​ (Dollars in Thousands) Balance at December 31, 2020 $ 21,908 ​ $ 37,612 ​ $ 30,000 ​ $ 5,051 ​ $ 3,874 ​ $ 9,570 ​ $ 291 ​ $ 753 $ 109,059 ​ Losses charged to allowance ​ (8,083) ​ (2) ​ (364) ​ — ​ (373) ​ (25) ​ (176) ​ (1) ​ (9,024) ​ Recoveries credited to allowance ​ 1,943 ​ — ​ 171 ​ — ​ 60 ​ 164 ​ 46 ​ — ​ 2,384 ​ Net losses charged to allowance ​ (6,140) ​ (2) ​ (193) ​ — ​ (313) ​ 139 ​ (130) ​ (1) ​ (6,640) ​ Provision (credit) charged to operations ​ 7,410 ​ ​ (2,220) ​ 5,847 ​ (1,760) ​ 512 ​ (1,955) ​ 111 ​ 10 ​ 7,955 ​ Balance at December 31, 2021 ​ $ 23,178 ​ $ 35,390 ​ $ 35,654 ​ $ 3,291 ​ $ 4,073 ​ $ 7,754 ​ $ 272 ​ $ 762 ​ $ 110,374 ​ ​ the high level of uncertainty in the economy and a potential economic recession on the horizon. We have increased the severity of some of the qualitative loss factors in certain pools of the portfolio to encompass the economic uncertainty, resulting in an increase in the required ACL. The pool specific qualitative loss factors management deemed appropriate for the ACL calculation at December 31, 2022 remained constant in the December 31, 2023 calculation, with the exception of the large loan factor that was added to the ACL calculation in the second quarter of 2023. The table below provides additional information on the balance of loans individually or collectively evaluated for impairment and their related allowance, by loan class: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 ​ ​ ​ Loans Individually ​ Loans Collectively ​ ​ ​ Evaluated For ​ Evaluated For ​ ​ ​ Impairment ​ Impairment ​ ​ ​ Recorded ​ ​ ​ ​ Recorded ​ ​ ​ ​ ​ ​ Investment ​ Allowance ​ Investment ​ Allowance ​ ​ ​ (Dollars in Thousands) ​ Domestic ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial $ 30,872 $ 7,971 $ 1,597,358 $ 27,579 ​ Commercial real estate: other construction & land development ​ 15,701 ​ 4,320 ​ 2,075,921 ​ 50,971 ​ Commercial real estate: farmland & commercial ​ 299 ​ — ​ 2,793,254 ​ 42,703 ​ Commercial real estate: multifamily ​ 96 ​ — ​ 380,743 ​ 5,088 ​ Residential: first lien ​ 93 ​ — ​ 477,940 ​ 5,812 ​ Residential: junior lien ​ — ​ — ​ 460,868 ​ 11,024 ​ Consumer ​ — ​ — ​ 45,121 ​ 318 ​ Foreign ​ — ​ — ​ 180,695 ​ 1,283 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 47,061 ​ $ 12,291 ​ $ 8,011,900 ​ $ 144,778 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022 ​ ​ ​ Loans Individually ​ Loans Collectively ​ ​ ​ Evaluated For ​ Evaluated For ​ ​ ​ Impairment ​ Impairment ​ ​ ​ Recorded ​ ​ ​ ​ Recorded ​ ​ ​ ​ ​ ​ Investment ​ Allowance ​ Investment ​ Allowance ​ ​ ​ (Dollars in Thousands) ​ Domestic ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial $ 30,747 $ 2,375 $ 1,468,006 $ 24,353 ​ Commercial real estate: other construction & land development ​ 20,483 ​ 70 ​ 1,969,186 ​ 44,614 ​ Commercial real estate: farmland & commercial ​ 94 ​ — ​ 2,568,025 ​ 36,474 ​ Commercial real estate: multifamily ​ 117 ​ — ​ 306,384 ​ 3,794 ​ Residential: first lien ​ 77 ​ — ​ 425,647 ​ 4,759 ​ Residential: junior lien ​ 312 ​ — ​ 439,958 ​ 8,284 ​ Consumer ​ — ​ — ​ 41,592 ​ 281 ​ Foreign ​ — ​ — ​ 159,975 ​ 968 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 51,830 ​ $ 2,445 ​ $ 7,378,773 ​ $ 123,527 ​ ​ Loans accounted for on a non-accrual basis at December 31, 2023, 2022 and 2021 amounted to $47,170,000, $51,648,000, and $1,921,000, respectively. The increase in non-accrual loans at December 31, 2022 is primarily attributable to two loans that were placed on non-accrual at the end of the fourth quarter of 2022. One relationship is secured by equipment used in the oil and gas industry and one is secured by real estate. The effect of such non-accrual loans reduced interest income by approximately $6,614,000, $116,000, and $169,000 for the years ended December 31, 2023, 2022, and 2021, respectively. Amounts received on non-accruals are applied, for financial accounting purposes, first to principal and then to interest after all principal has been collected. Accruing loans contractually past due 90 days or more as to principal or interest payments at December 31, 2023, 2022, and 2021 amounted to approximately $5,597,000, $6,132,000, and $8,642,000, respectively. The table below provides additional information on loans accounted for on a non-accrual basis by loan class: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 ​ December 31, 2022 ​ ​ ​ (Dollars in Thousands) ​ Domestic ​ ​ ​ ​ ​ ​ ​ Commercial $ 30,872 $ 30,747 ​ Commercial real estate: other construction & land development ​ 15,701 ​ 20,483 ​ Commercial real estate: farmland & commercial ​ 299 ​ 94 ​ Commercial real estate: multifamily ​ 96 ​ 117 ​ Residential: first lien ​ 202 ​ 207 ​ Total non-accrual loans ​ $ 47,170 ​ $ 51,648 ​ ​ Doubtful loans are those loans where it is probable that all amounts due according to contractual terms of the loan agreement will not be collected. We have identified these loans through our normal loan review procedures. Doubtful loans are measured based on (i) the present value of expected future cash flows discounted at the loan’s effective interest rate; (ii) the loan’s observable market price; or (iii) the fair value of the collateral if the loan is collateral dependent. Substantially all of our doubtful loans are measured at the fair value of the collateral. In limited cases, we may use other methods to determine the level of impairment of a loan if such loan is not collateral dependent. ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022 ​ ​ ​ (Dollars in Thousands) ​ Domestic ​ ​ ​ ​ Residential: first lien ​ $ 1,642 ​ Residential: junior lien ​ ​ 714 ​ Consumer ​ ​ 802 ​ Foreign ​ ​ 55 ​ Total troubled debt restructuring ​ $ 3,213 ​ ​ The Subsidiary Banks charge-off that portion of any loan which management considers to represent a loss as well as that portion of any other loan which is classified as a “loss” by bank examiners. Commercial and industrial or real estate loans are generally considered by management to represent a loss, in whole or part, when an exposure beyond any collateral coverage is apparent and when no further collection of the loss portion is anticipated based on the borrower’s financial condition and general economic conditions in the borrower’s industry. Generally, unsecured consumer loans are charged-off when 90 days past due. ​ While management considers that it is generally able to identify borrowers with financial problems reasonably early and to monitor credit extended to such borrowers carefully, there is no precise method of predicting loan losses. The determination that a loan is likely to be uncollectible and that it should be wholly or partially charged-off as a loss is an exercise of judgment. Similarly, the determination of the adequacy of the ACL (formerly allowance for probable loan losses) can be made only on a subjective basis. It is the judgment of our management that the ACL at December 31, 2023 and December 31, 2022, was adequate to absorb expected losses from loans in the portfolio at that date. The following table presents information regarding the aging of past due loans by loan class: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 90 Days or ​ Total ​ ​ ​ ​ ​ ​ ​ ​ ​ 30 - 59 ​ 60 - 89 ​ 90 Days or ​ greater & ​ Past ​ ​ ​ ​ Total ​ ​ ​ Days ​ Days ​ Greater ​ still accruing ​ Due ​ Current ​ Portfolio ​ ​ ​ (Dollars in Thousands) ​ Domestic ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial $ 2,387 $ 1,583 $ 30,238 $ 539 $ 34,208 $ 1,594,022 $ 1,628,230 ​ Commercial real estate: other construction & land development ​ 3,460 ​ — ​ 10,245 ​ — ​ 13,705 ​ 2,077,917 ​ 2,091,622 ​ Commercial real estate: farmland & commercial ​ 1,424 ​ 371 ​ 93 ​ 4 ​ 1,888 ​ 2,791,665 ​ 2,793,553 ​ Commercial real estate: multifamily ​ 369 ​ 330 ​ — ​ — ​ 699 ​ 380,140 ​ 380,839 ​ Residential: first lien ​ 1,812 ​ 1,439 ​ 2,545 ​ 2,437 ​ 5,796 ​ 472,236 ​ 478,032 ​ Residential: junior lien ​ 1,273 ​ 613 ​ 1,701 ​ 1,701 ​ 3,587 ​ 457,282 ​ 460,869 ​ Consumer ​ 263 ​ 11 ​ 27 ​ 27 ​ 301 ​ 44,820 ​ 45,121 ​ Foreign ​ 1,884 ​ 848 ​ 889 ​ 889 ​ 3,621 ​ 177,074 ​ 180,695 ​ Total past due loans ​ $ 12,872 ​ $ 5,195 ​ $ 45,738 ​ $ 5,597 ​ $ 63,805 ​ $ 7,995,156 ​ $ 8,058,961 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 90 Days or ​ Total ​ ​ ​ ​ ​ ​ ​ ​ ​ 30 - 59 ​ 60 - 89 ​ 90 Days or ​ greater & ​ Past ​ ​ ​ ​ Total ​ ​ ​ Days ​ Days ​ Greater ​ still accruing ​ Due ​ Current ​ Portfolio ​ ​ ​ (Dollars in Thousands) ​ Domestic ​ ​ ​ ​ ​ ​ ​ ​ Commercial ​ $ 1,732 $ 258 $ 1,014 $ 59 $ 3,004 $ 1,495,750 $ 1,498,754 ​ Commercial real estate: other construction & land development ​ 1,130 ​ — ​ — ​ — ​ 1,130 ​ 1,988,539 ​ 1,989,669 ​ Commercial real estate: farmland & commercial ​ 1,744 ​ 117 ​ — ​ — ​ 1,861 ​ 2,566,257 ​ 2,568,118 ​ Commercial real estate: multifamily ​ — ​ — ​ — ​ — ​ — ​ 306,501 ​ 306,501 ​ Residential: first lien ​ 2,023 ​ 1,068 ​ 4,189 ​ 4,061 ​ 7,280 ​ 418,444 ​ 425,724 ​ Residential: junior lien ​ 925 ​ 771 ​ 1,717 ​ 1,717 ​ 3,413 ​ 436,857 ​ 440,270 ​ Consumer ​ 281 ​ 14 ​ 7 ​ 7 ​ 302 ​ 41,290 ​ 41,592 ​ Foreign ​ 717 ​ 23 ​ 288 ​ 288 ​ 1,028 ​ 158,947 ​ 159,975 ​ Total past due loans ​ $ 8,552 ​ $ 2,251 ​ $ 7,215 ​ $ 6,132 ​ $ 18,018 ​ $ 7,412,585 ​ $ 7,430,603 ​ ​ The increase in Commercial loans past due 90 days or greater at December 31, 2023 can be primarily attributed to a loan secured by equipment and other assets used in the oil and gas industry and oil and gas production that is on non-accrual. The increase in Commercial Real Estate: Other Construction & Land Development loans past due 90 days or greater can be primarily attributed to a loan secured by commercial property that is on non-accrual. Our internal classified report is segregated into the following categories: (i) “Special Review Credits,” (ii) “Watch List—Pass Credits,” or (iii) “Watch List—Substandard Credits.” The loans placed in the “Special Review Credits” category reflect our opinion that the loans reflect potential weakness which require monitoring on a more frequent basis. The “Special Review Credits” are reviewed and discussed on a regular basis with the credit department and the lending staff to determine if a change in category is warranted. The loans placed in the “Watch List—Pass Credits” category reflect our opinion that the credit contains weaknesses which represent a greater degree of risk, which warrant “extra attention.” The “Watch List—Pass Credits” are reviewed and discussed on a regular basis with the credit department and the lending staff to determine if a change in category is warranted. The loans placed in the “Watch List—Substandard Credits” classification are considered to be potentially inadequately protected by the current sound worth and debt service capacity of the borrower or of any pledged collateral. These credit obligations, even if apparently protected by collateral value, have shown defined weaknesses related to adverse financial, managerial, economic, market, or political conditions which may jeopardize repayment of principal and interest. Furthermore, there is the possibility that we could sustain some future loss if such weaknesses are not corrected. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 2021 2020 2019 Prior Total ​ ​ ​ (Dollars in Thousands) ​ Balance at December 31, 2023 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Domestic ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 791,233 ​ $ 272,919 ​ $ 364,271 ​ $ 50,602 ​ $ 21,468 ​ $ 74,119 ​ $ 1,574,612 ​ Special Review ​ ​ 7,613 ​ ​ 1,800 ​ ​ 164 ​ ​ — ​ ​ — ​ ​ — ​ ​ 9,577 ​ Watch List - Pass ​ ​ 11,865 ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 11,865 ​ Watch List - Substandard ​ ​ 1,180 ​ ​ 92 ​ ​ 28 ​ ​ — ​ ​ — ​ ​ 4 ​ ​ 1,304 ​ Watch List - Doubtful ​ ​ 27 ​ ​ 30,810 ​ ​ 35 ​ ​ — ​ ​ — ​ ​ — ​ ​ 30,872 ​ Total Commercial ​ $ 811,918 ​ $ 305,621 ​ $ 364,498 ​ $ 50,602 ​ $ 21,468 ​ $ 74,123 ​ $ 1,628,230 ​ Commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Current-period gross writeoffs ​ $ 7,053 ​ $ 2,187 ​ $ 155 ​ $ 264 ​ $ 2 ​ $ 3 ​ $ 9,664 ​ Commercial real estate: other construction & land development ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 938,739 ​ $ 674,037 ​ $ 324,238 ​ $ 96,400 ​ $ 14,058 ​ $ 3,219 ​ $ 2,050,691 ​ Watch List - Substandard ​ ​ 25,230 ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 25,230 ​ Watch List - Doubtful ​ ​ 2,726 ​ ​ 12,975 ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 15,701 ​ Total Commercial real estate: other construction & land development ​ $ 966,695 ​ $ 687,012 ​ $ 324,238 ​ $ 96,400 ​ $ 14,058 ​ $ 3,219 ​ $ 2,091,622 ​ Commercial real estate: other construction & land development ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate: farmland & commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 888,878 ​ $ 628,653 ​ $ 415,458 ​ $ 267,705 ​ $ 184,164 ​ $ 248,626 ​ $ 2,633,484 ​ Special Review ​ ​ 5,205 ​ ​ — ​ ​ 3,357 ​ ​ — ​ ​ — ​ ​ — ​ ​ 8,562 ​ Watch List - Pass ​ ​ 16,654 ​ ​ 87 ​ ​ 233 ​ ​ — ​ ​ — ​ ​ — ​ ​ 16,974 ​ Watch List - Substandard ​ ​ 129,644 ​ ​ 2,201 ​ ​ — ​ ​ 2,304 ​ ​ 84 ​ ​ 1 ​ ​ 134,234 ​ Watch List - Doubtful ​ ​ 211 ​ ​ 88 ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 299 ​ Total Commercial real estate: farmland & commercial ​ $ 1,040,592 ​ $ 631,029 ​ $ 419,048 ​ $ 270,009 ​ $ 184,248 ​ $ 248,627 ​ $ 2,793,553 ​ Commercial real estate: farmland & commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate: multifamily ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 123,523 ​ $ 94,551 ​ $ 42,081 ​ $ 73,652 ​ $ 10,743 ​ $ 36,193 ​ $ 380,743 ​ Watch List - Doubtful ​ ​ — ​ ​ 96 ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 96 ​ Total Commercial real estate: multifamily ​ $ 123,523 ​ $ 94,647 ​ $ 42,081 ​ $ 73,652 ​ $ 10,743 ​ $ 36,193 ​ $ 380,839 ​ Commercial real estate: multifamily ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential: first lien ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 180,127 ​ $ 83,568 ​ $ 68,082 ​ $ 39,935 ​ $ 27,499 ​ $ 78,306 ​ $ 477,517 ​ Watch List - Substandard ​ ​ — ​ ​ — ​ ​ 327 ​ ​ — ​ ​ — ​ ​ 95 ​ ​ 422 ​ Watch List - Doubtful ​ ​ — ​ ​ 93 ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 93 ​ Total Residential: first lien ​ $ 180,127 ​ $ 83,661 ​ $ 68,409 ​ $ 39,935 ​ $ 27,499 ​ $ 78,401 ​ $ 478,032 ​ Residential: first lien ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Current-period gross writeoffs ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ 43 ​ $ 43 ​ Residential: junior lien ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 88,628 ​ $ 76,845 ​ $ 96,411 ​ $ 76,490 ​ $ 34,870 ​ $ 87,625 ​ $ 460,869 ​ Total Residential: junior lien ​ $ 88,628 ​ $ 76,845 ​ $ 96,411 ​ $ 76,490 ​ $ 34,870 ​ $ 87,625 ​ $ 460,869 ​ Residential: junior lien ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Current-period gross writeoffs ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ 298 ​ $ 298 ​ Consumer ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 36,639 ​ $ 5,366 ​ $ 1,043 ​ $ 237 ​ $ 157 ​ $ 1,679 ​ $ 45,121 ​ Total Consumer ​ $ 36,639 ​ $ 5,366 ​ $ 1,043 ​ $ 237 ​ $ 157 ​ $ 1,679 ​ $ 45,121 ​ Consumer ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Current-period gross writeoffs ​ $ 54 ​ $ 115 ​ $ 9 ​ $ — ​ $ 1 ​ $ — ​ $ 179 ​ Foreign ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 116,104 ​ $ 43,842 ​ $ 12,317 ​ $ 2,016 ​ $ 2,797 ​ $ 3,619 ​ $ 180,695 ​ Total Foreign ​ $ 116,104 ​ $ 43,842 ​ $ 12,317 ​ $ 2,016 ​ $ 2,797 ​ $ 3,619 ​ $ 180,695 ​ Total Loans ​ $ 3,364,226 ​ $ 1,928,023 ​ $ 1,328,045 ​ $ 609,341 ​ $ 295,840 ​ $ 533,486 ​ $ 8,058,961 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2022 2021 2020 2019 2018 Prior Total ​ ​ (Dollars in Thousands) Balance at December 31, 2022 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Domestic ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 736,462 ​ $ 524,879 ​ $ 96,401 ​ $ 35,917 ​ $ 43,792 ​ $ 29,464 ​ $ 1,466,915 Special Review ​ ​ 377 ​ ​ 213 ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 590 Watch List - Substandard ​ ​ 161 ​ ​ 149 ​ ​ 143 ​ ​ — ​ ​ 49 ​ ​ — ​ ​ 502 Watch List - Doubtful ​ ​ 29,789 ​ ​ — ​ ​ 954 ​ ​ — ​ ​ — ​ ​ 4 ​ ​ 30,747 Total Commercial ​ $ 766,789 ​ $ 525,241 ​ $ 97,498 ​ $ 35,917 ​ $ 43,841 ​ $ 29,468 ​ $ 1,498,754 Commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate: other construction & land development ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 913,675 ​ $ 666,347 ​ $ 173,824 ​ $ 174,897 ​ $ 35,069 ​ $ 5,165 ​ $ 1,968,977 Special Review ​ ​ — ​ ​ — ​ ​ — ​ ​ 209 ​ ​ — ​ ​ — ​ ​ 209 Watch List - Doubtful ​ ​ 19,982 ​ ​ 407 ​ ​ 94 ​ ​ — ​ ​ — ​ ​ — ​ ​ 20,483 Total Commercial real estate: other construction & land development ​ $ 933,657 ​ $ 666,754 ​ $ 173,918 ​ $ 175,106 ​ $ 35,069 ​ $ 5,165 ​ $ 1,989,669 Commercial real estate: farmland & commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 811,117 ​ $ 584,134 ​ $ 456,200 ​ $ 232,537 ​ $ 325,214 ​ $ 81,295 ​ $ 2,490,497 Special Review ​ ​ 2,855 ​ ​ — ​ ​ 842 ​ ​ — ​ ​ — ​ ​ — ​ ​ 3,697 Watch List - Pass ​ ​ 17,060 ​ ​ 247 ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 17,307 Watch List - Substandard ​ ​ 2,275 ​ ​ — ​ ​ 54,152 ​ ​ 96 ​ ​ — ​ ​ — ​ ​ 56,523 Watch List - Doubtful ​ ​ 94 ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 94 Total Commercial real estate: farmland & commercial ​ $ 833,401 ​ $ 584,381 ​ $ 511,194 ​ $ 232,633 ​ $ 325,214 ​ $ 81,295 ​ $ 2,568,118 Commercial real estate: multifamily ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 127,680 ​ $ 87,469 ​ $ 59,035 ​ $ 12,026 ​ $ 5,490 ​ $ 14,684 ​ $ 306,384 Watch List - Doubtful ​ ​ 117 ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 117 Total Commercial real estate: multifamily ​ $ 127,797 ​ $ 87,469 ​ $ 59,035 ​ $ 12,026 ​ $ 5,490 ​ $ 14,684 ​ $ 306,501 Residential: first lien ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 138,771 ​ $ 82,466 ​ $ 49,591 ​ $ 40,985 ​ $ 33,814 ​ $ 79,660 ​ $ 425,287 Watch List - Substandard ​ ​ — ​ ​ 360 ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 360 Watch List - Doubtful ​ ​ 77 ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 77 Total Residential: first lien ​ $ 138,848 ​ $ 82,826 ​ $ 49,591 ​ $ 40,985 ​ $ 33,814 ​ $ 79,660 ​ $ 425,724 Residential: junior lien ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 92,256 ​ $ 108,815 ​ $ 91,130 ​ $ 41,273 ​ $ 21,975 ​ $ 84,509 ​ $ 439,958 Watch List- Doubtful ​ ​ — ​ ​ 312 ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 312 Total Residential: junior lien ​ $ 92,256 ​ $ 109,127 ​ $ 91,130 ​ $ 41,273 ​ $ 21,975 ​ $ 84,509 ​ $ 440,270 Consumer ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 31,962 ​ $ 6,603 ​ $ 897 ​ $ 489 ​ $ 28 ​ $ 1,613 ​ $ 41,592 Total Consumer ​ $ 31,962 ​ $ 6,603 ​ $ 897 ​ $ 489 ​ $ 28 ​ $ 1,613 ​ $ 41,592 Foreign ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 124,265 ​ $ 19,082 ​ $ 5,362 ​ $ 4,848 ​ $ 3,417 ​ $ 3,001 ​ $ 159,975 Total Foreign ​ $ 124,265 ​ $ 19,082 ​ $ 5,362 ​ $ 4,848 ​ $ 3,417 ​ $ 3,001 ​ $ 159,975 Total Loans ​ $ 3,048,975 ​ $ 2,081,483 ​ $ 988,625 ​ $ 543,277 ​ $ 468,848 ​ $ 299,395 ​ $ 7,430,603 ​ ​ ​ ​ The increase in Watch-List Pass Commercial loans at December 31, 2023 compared to December 31, 2022 can be primarily attributable to a relationship secured by commercial vehicles, which was downgraded from Pass. The increase in Commercial Real Estate: Construction and Development loans at December 31, 2023 compared to December 31, 2022 can be primarily attributable to the downgrade of two relationships secured by land for future develop

Bank Premises and Equipment

Bank Premises and Equipment	12 Months Ended
	Dec. 31, 2023
Bank Premises and Equipment
Bank Premises and Equipment	(5) Bank Premises and Equipment A summary of bank premises and equipment, by asset classification, at December 31, 2023 and 2022 were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Estimated ​ ​ ​ ​ ​ ​ ​ ​ useful lives ​ 2023 ​ 2022 ​ ​ ​ ​ ​ ​ ​ (Dollars in Thousands) Bank buildings and improvements 5 - 39 years $ 582,075 $ 571,665 ​ Furniture, equipment and vehicles 1 - 20 years ​ 325,855 ​ 307,990 ​ Land ​ ​ ​ ​ ​ ​ 108,551 ​ 108,622 ​ Less: accumulated depreciation ​ ​ ​ ​ ​ ​ (579,387) ​ (556,665) ​ Bank premises and equipment, net ​ ​ ​ ​ ​ ​ $ 437,094 ​ $ 431,612 ​ ​

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	12 Months Ended
	Dec. 31, 2023
Goodwill and Other Intangible Assets
Goodwill and Other Intangible Assets	(6) Goodwill and Other Intangible Assets The majority of our identified intangibles are in the form of amortizable core deposit premium. A small portion of the fully amortized identified intangibles represent identified intangibles in the acquisition of the rights to the insurance agency contracts of InsCorp, Inc., acquired in 2008. Information on our identified intangible assets follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Carrying ​ Accumulated ​ ​ ​ ​ ​ Amount ​ Amortization ​ Net ​ ​ (Dollars in Thousands) December 31, 2023: ​ ​ ​ ​ Core deposit premium ​ $ 58,675 ​ $ 58,675 ​ $ — ​ Identified intangible (contract rights) ​ 2,022 ​ 2,022 ​ — ​ Total identified intangibles ​ $ 60,697 ​ $ 60,697 ​ $ — ​ December 31, 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Core deposit premium ​ $ 58,675 ​ $ 58,675 ​ $ — ​ Identified intangible (contract rights) ​ 2,022 ​ 2,022 ​ — ​ Total identified intangibles ​ $ 60,697 ​ $ 60,697 ​ $ — ​ ​ Amortization expense of intangible assets was $0, $0 and $0 for the years ended December 31, 2023, 2022, and 2021. There were no changes in the carrying amount of goodwill for the years ended December 31, 2023 and 2022.

Deposits

Deposits	12 Months Ended
	Dec. 31, 2023
Deposits.
Deposits	(7) Deposits Deposits as of December 31, 2023 and 2022 and related interest expense for the years ended December 31, 2023, 2022, and 2021 were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 ​ 2022 ​ ​ (Dollars in Thousands) Deposits: ​ ​ ​ Demand - non-interest bearing ​ ​ ​ ​ ​ ​ ​ Domestic ​ $ 4,126,635 ​ $ 4,744,299 ​ Foreign ​ 904,210 ​ 1,101,756 ​ Total demand non-interest bearing ​ 5,030,845 ​ 5,846,055 ​ Savings and interest bearing demand ​ ​ ​ ​ ​ ​ ​ Domestic ​ 3,161,411 ​ 3,448,717 ​ Foreign ​ 1,207,121 ​ 1,297,051 ​ Total savings and interest bearing demand ​ 4,368,532 ​ 4,745,768 ​ Time, certificates of deposit $100,000 or more ​ ​ ​ ​ ​ ​ ​ Domestic ​ 763,419 ​ 652,073 ​ Foreign ​ 1,103,710 ​ 892,619 ​ Less than $100,000 ​ ​ ​ ​ ​ ​ ​ Domestic ​ 289,565 ​ 276,660 ​ Foreign ​ 268,483 ​ 246,832 ​ Total time, certificates of deposit ​ 2,425,177 ​ 2,068,184 ​ Total deposits ​ $ 11,824,554 ​ $ 12,660,007 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 ​ 2022 ​ 2021 ​ ​ (Dollars in Thousands) Interest expense: ​ ​ ​ ​ Savings and interest bearing demand ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Domestic $ 42,148 ​ $ 9,196 ​ $ 3,268 ​ Foreign ​ 18,189 ​ 3,490 ​ 842 ​ Total savings and interest bearing demand ​ 60,337 ​ 12,686 ​ 4,110 ​ Time, certificates of deposit $100,000 or more ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Domestic ​ 18,597 ​ 5,528 ​ 6,652 ​ Foreign ​ 25,471 ​ 3,867 ​ 3,452 ​ Less than $100,000 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Domestic ​ 4,592 ​ 1,027 ​ 984 ​ Foreign ​ 4,498 ​ 735 ​ 567 ​ Total time, certificates of deposit ​ 53,158 ​ 11,157 ​ 11,655 ​ Total interest expense on deposits ​ $ 113,495 ​ $ 23,843 ​ $ 15,765 ​ ​ Scheduled maturities of time deposits as of December 31, 2023 were as follows: ​ ​ ​ ​ ​ ​ ​ Total ​ ​ (in thousands) 2024 ​ $ 2,301,914 ​ 2025 ​ 85,385 ​ 2026 ​ 23,102 ​ 2027 ​ 14,200 ​ 2028 ​ 573 ​ Thereafter ​ 3 ​ Total ​ $ 2,425,177 ​ ​ Scheduled maturities of time deposits in amounts of $100,000 or more at December 31, 2023, were as follows: ​ ​ ​ ​ ​ ​ ​ Total ​ ​ (in thousands) Due within 3 months or less $ 859,734 Due after 3 months and within 6 months ​ 517,994 Due after 6 months and within 12 months ​ 409,193 Due after 12 months ​ 80,208 ​ ​ $ 1,867,129 ​ Time deposits that meet or exceed the FDIC insurance limit of $250,000 at December 31, 2023 and December 31, 2022 were $749,169,000 and $585,456,000, respectively.

Securities Sold Under Repurchas

Securities Sold Under Repurchase Agreements	12 Months Ended
	Dec. 31, 2023
Securities Sold Under Repurchase Agreements
Securities Sold Under Repurchase Agreements	(8) Securities Sold Under Repurchase Agreements Our Subsidiary Banks have entered into repurchase agreements with individual customers of the Subsidiary Banks. The purchasers have agreed to resell to the Subsidiary Banks identical securities upon the maturities of the agreements. Securities sold under repurchase agreements were mortgage-backed securities and averaged $469,152,000 and $476,877,000 during 2023 and 2022, respectively, and the maximum amount outstanding at any month end during 2023 and 2022 was $544,418,000 and $513,368,000, respectively. Further information related to repurchase agreements at December 31, 2023 and 2022 is set forth in the following table: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Collateral Securities ​ Repurchase Borrowing ​ ​ Book Value of ​ Fair Value of ​ Balance of ​ Weighted Average ​ ​ Securities Sold ​ Securities Sold ​ Liability ​ Interest Rate ​ ​ (Dollars in Thousands) December 31, 2023 term: ​ ​ ​ ​ Overnight agreements ​ $ 667,647 ​ $ 587,673 ​ $ 518,650 3.76 % 1 to 29 days ​ 24,842 ​ 20,454 ​ 10,696 4.50 ​ 30 to 90 days ​ — ​ — ​ — — ​ Over 90 days ​ 1,623 ​ 1,574 ​ 1,070 4.00 ​ Total ​ $ 694,112 ​ $ 609,701 ​ $ 530,416 3.78 % December 31, 2022 term: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Overnight agreements ​ $ 664,491 ​ $ 559,637 ​ $ 419,703 1.61 % 1 to 29 days ​ — ​ — ​ — — ​ 30 to 90 days ​ — ​ — ​ — — ​ Over 90 days ​ 20,852 ​ 16,968 ​ 11,488 1.32 ​ Total ​ $ 685,343 ​ $ 576,605 ​ $ 431,191 1.60 % ​ The book value and fair value of securities sold includes the entire book value and fair value of securities partially or fully pledged under repurchase agreements.

Other Borrowed Funds

Other Borrowed Funds	12 Months Ended
	Dec. 31, 2023
Other Borrowed Funds
Other Borrowed Funds	(9) Other Borrowed Funds Other borrowed funds include Federal Home Loan Bank borrowings, which may be short, and long-term fixed borrowings issued by the Federal Home Loan Bank of Dallas and the Federal Home Loan Bank of Topeka at the market price offered at the time of funding. These borrowings are secured by mortgage-backed investment securities and a portion of our loan portfolio. Further information regarding our other borrowed funds at December 31, 2023 and 2022 is set forth in the following table: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ ​ 2023 ​ 2022 ​ ​ (Dollars in Thousands) Federal Home Loan Bank advances—long-term(1) ​ ​ ​ ​ ​ ​ ​ Balance at year end ​ $ 10,745 ​ $ 10,944 ​ Rate on balance outstanding at year end ​ 2.61 % 2.61 % Average daily balance ​ $ 10,837 ​ $ 386,924 ​ Average rate ​ 2.61 % 1.75 % Maximum amount outstanding at any month end ​ $ 10,928 ​ $ 436,122 ​ (1) Long-term advances at December 31, 2023 and December 31, 2022 consisted of amortizing and non-amortizing advances. The non-amortizing advances totaling $425,000,000 were called by the Federal Home Loan bank in the fourth quarter of 2022. Two amortizing advances are outstanding at December 31, 2023 in the amounts of $2,914,000 and $7,831,000 and mature in December 2033 and November 2033, respectively. The amortization on the amortizing long-term advances totals approximately $204,000 , $210,000 , $215,000 , $221,000 and $227,000 for the years ending December 31, 2024, 2025, 2026, 2027 and December 31, 2028, respectively .

Junior Subordinated Interest De

Junior Subordinated Interest Deferrable Debentures	12 Months Ended
	Dec. 31, 2023
Junior Subordinated Interest Deferrable Debentures
Junior Subordinated Interest Deferrable Debentures	(10) Junior Subordinated Deferrable Interest Debentures We currently have four statutory business trusts under the laws of the State of Delaware for the purpose of issuing trust preferred securities. These statutory business trusts (the “Trusts”) each issued capital and common securities (“Capital and Common Securities”) and invested the proceeds thereof in an equivalent amount of junior subordinated debentures (the “Debentures”) we issued. As of December 31, 2023 and December 31, 2022, the principal amount of debentures outstanding totaled $108,868,000 and $134,642,000, respectively. The Debentures are subordinated and junior in right of payment to all our present and future senior indebtedness (as defined in the respective indentures) and are pari passu For financial reporting purposes, the Trusts are treated as investments and not consolidated in the consolidated financial statements. Although the Capital Securities issued by each of the Trusts are not included as a component of shareholders’ equity on the consolidated statement of condition, the Capital Securities are treated as capital for regulatory purposes. Specifically, under applicable regulatory guidelines, the Capital Securities issued by the Trusts qualify as Tier 1 capital up to a maximum of 25% of Tier 1 capital on an aggregate basis. Any amount that exceeds the 25% threshold would qualify as Tier 2 capital. At December 31, 2023 and December 31, 2022, the total $108,868,000 and $134,642,000, respectively, of the Capital Securities outstanding qualified as Tier 1 capital. The following table illustrates key information about each of the Debentures and their interest rates at December 31, 2023: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Junior ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Subordinated ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Deferrable ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest ​ Repricing ​ Interest ​ Interest ​ ​ ​ Optional ​ ​ ​ Debentures ​ Frequency ​ Rate ​ Rate Index (1) ​ Maturity Date ​ Redemption Date (2) ​ ​ ​ (Dollars in Thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Trust IX ​ $ 41,238 Quarterly 7.28 % SOFR + 1.62 October 2036 October 2011 ​ Trust X ​ 21,021 Quarterly 7.29 % SOFR + 1.65 February 2037 February 2012 ​ Trust XI ​ 25,990 Quarterly 7.28 % SOFR + 1.62 July 2037 July 2012 ​ Trust XII ​ 20,619 Quarterly 7.09 % SOFR + 1.45 September 2037 September 2012 ​ ​ ​ $ 108,868 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (1) On July 1, 2023, the interest rate index on the Capital and Common Securities transitioned from U.S.-dollar London Interbank Offered Rate (“LIBOR”) to the Three-Month CME Term Secured Overnight Financing rate (“SOFR”) with a 26-basis point spread adjustment. (2) The Capital Securities may be redeemed in whole or in part on any interest payment date after the Optional Redemption Date.

Earnings per Share ("EPS")

Earnings per Share ("EPS")	12 Months Ended
	Dec. 31, 2023
Earnings per Share ("EPS")
Earnings per Share ("EPS")	(11) Earnings per Share (“EPS”) Basic EPS is calculated by dividing net income by the weighted average number of common shares outstanding. The computation of diluted EPS assumes the issuance of common shares for all dilutive potential common shares outstanding during the reporting period. The calculation of the basic EPS and the diluted EPS for the years ended December 31, 2023, 2022, and 2021 is set forth in the following table: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net Income ​ Shares ​ Per Share ​ ​ (Numerator) ​ (Denominator) ​ Amount ​ ​ (Dollars in Thousands, ​ ​ Except Per Share Amounts) December 31, 2023: ​ ​ ​ Basic EPS ​ ​ ​ ​ ​ ​ ​ ​ ​ Net income available to common shareholders ​ $ 411,768 62,082,827 ​ $ 6.63 ​ Potential dilutive common shares ​ — 138,774 ​ ​ ​ ​ Diluted EPS ​ $ 411,768 62,221,601 ​ $ 6.62 ​ December 31, 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ Basic EPS ​ ​ ​ ​ ​ ​ ​ ​ ​ Net income available to common shareholders ​ $ 300,232 62,658,414 ​ $ 4.79 ​ Potential dilutive common shares ​ — 151,820 ​ ​ ​ ​ Diluted EPS ​ $ 300,232 62,810,234 ​ $ 4.78 ​ December 31, 2021: ​ ​ ​ ​ ​ ​ ​ ​ ​ Basic EPS ​ ​ ​ ​ ​ ​ ​ ​ ​ Net income available to common shareholders ​ $ 253,922 63,352,737 ​ $ 4.01 ​ Potential dilutive common shares ​ — 133,629 ​ ​ ​ ​ Diluted EPS ​ $ 253,922 63,486,366 ​ $ 4.00 ​ ​

Employees' Profit Sharing Plan

Employees' Profit Sharing Plan	12 Months Ended
	Dec. 31, 2023
Employees' Profit Sharing Plan
Employees' Profit Sharing Plan	(12) Employees’ Profit-Sharing Plan We have a deferred profit-sharing plan for full-time employees with a minimum of one year of continuous employment. Our annual contribution to the plan is based on a percentage, as determined by our Board of Directors, of income before income taxes, as defined, for the year. Allocation of the contribution among officers and employees’ accounts is based on length of service and amount of salary earned. Profit sharing costs of $4,011,000, $4,300,000, and $3,550,000 were charged to income for the years ended December 31, 2023, 2022, and 2021, respectively.

International Operations

International Operations	12 Months Ended
	Dec. 31, 2023
International Operations
International Operations	(13) International Operations We provide international banking services for our customers through our Subsidiary Banks. Neither we nor our Subsidiary Banks have facilities located outside the United States. International operations are distinguished from domestic operations based upon the domicile of the customer. Because the resources we employ are common to both international and domestic operations, it is not practical to determine net income generated exclusively from international activities. A summary of assets attributable to international operations at December 31, 2023 and 2022 are as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 ​ 2022 ​ ​ (Dollars in Thousands) Loans: ​ ​ ​ Commercial ​ $ 106,241 ​ $ 103,748 ​ Others ​ 74,454 ​ 56,227 ​ ​ ​ 180,695 ​ 159,975 ​ Less allowance for probable loan losses ​ (1,283) ​ (968) ​ Net loans ​ $ 179,412 ​ $ 159,007 ​ Accrued interest receivable ​ $ 876 ​ $ 515 ​ ​ At December 31, 2023 and December 31, 2022, we had $147,551,000 and $131,254,000, respectively, in outstanding standby and commercial letters of credit to facilitate trade activities. Revenues directly attributable to international operations were approximately $8,212,000, $4,821,000, and $4,090,000 for the years ended December 31, 2023, 2022 and 2021, respectively.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2023
Income Taxes
Income Taxes	(14) Income Taxes We file a consolidated U.S. Federal and State income tax return. The current and deferred portions of net income tax expense included in the consolidated statements of income are presented below for the years ended December 31: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 ​ 2022 ​ 2021 ​ ​ (Dollars in Thousands) Current ​ ​ ​ ​ U.S. ​ $ 82,657 ​ $ 66,670 ​ $ 59,591 ​ State ​ 6,137 ​ 5,118 ​ 5,272 ​ Total current taxes ​ 88,794 ​ 71,788 ​ 64,863 ​ Deferred ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. ​ 23,001 ​ 10,555 ​ 3,794 ​ State ​ (51) ​ 64 ​ (252) ​ Total deferred taxes ​ 22,950 ​ 10,619 ​ 3,542 ​ Total income taxes ​ $ 111,744 ​ $ 82,407 ​ $ 68,405 ​ ​ Total income tax expense differs from the amount computed by applying the U.S. Federal income tax rate of 21% for 2023, 2022, and 2021 to income before income taxes. The reasons for the differences for the years ended December 31 are as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 ​ 2022 ​ 2021 ​ ​ (Dollars in Thousands) Computed expected tax expense $ 110,065 $ 80,893 $ 68,011 ​ Change in taxes resulting from: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Tax-exempt interest income ​ (3,663) ​ (2,433) ​ (2,970) ​ State tax, net of federal income taxes, tax credit and refunds ​ 4,808 ​ 4,094 ​ 3,966 ​ Other investment income ​ (2,761) ​ (1,391) ​ (1,753) ​ Net investment in low income housing investments ​ ​ 1,974 ​ ​ 1,906 ​ ​ 203 ​ Other ​ 1,321 ​ (662) ​ 948 ​ Actual tax expense ​ $ 111,744 ​ $ 82,407 ​ $ 68,405 ​ ​ The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities at December 31, 2023 and 2022 are reflected below: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 ​ 2022 ​ ​ (Dollars in Thousands) Deferred tax assets: ​ ​ ​ Loans receivable, principally due to the allowance for probable loan losses ​ $ 32,136 ​ $ 25,982 ​ Other real estate owned ​ 1,649 ​ 1,194 ​ Accrued expenses ​ 581 ​ 186 ​ Net unrealized losses on available for sale investment securities ​ ​ 110,584 ​ ​ 130,586 ​ Other ​ 1,352 ​ 2,308 ​ Total deferred tax assets ​ 146,302 ​ 160,256 ​ Deferred tax liabilities: ​ ​ ​ ​ ​ ​ ​ Bank premises and equipment, principally due to differences on depreciation ​ (14,879) ​ (13,615) ​ Impairment charges on available-for-sale securities ​ ​ (19) ​ ​ (19) ​ Identified intangible assets and goodwill ​ (14,151) ​ (14,125) ​ Partnership investment pass through ​ ​ (58,376) ​ ​ (30,319) ​ Other ​ (3,321) ​ (3,555) ​ Total deferred tax liabilities ​ (90,746) ​ (61,633) ​ Net deferred tax asset ​ $ 55,556 ​ $ 98,623 ​ ​ The net deferred tax asset of $55,556,000 and $98,623,000 at December 31, 2023 and December 31, 2022, respectively, is included in other assets in the consolidated statements of condition.

Stock Options and Stock Appreci

Stock Options and Stock Appreciation Rights	12 Months Ended
	Dec. 31, 2023
Stock Options and Stock Appreciation Rights
Stock Options and Stock Appreciation Rights	(15) Stock Options and Stock Appreciation Rights On April 5, 2012, the Board of Directors adopted the 2012 International Bancshares Corporation Stock Option Plan (the “2012 Plan”). There were 800,000 shares of common stock available for stock option grants under the 2012 Plan, which were qualified incentive stock options (“ISOs”) or non-qualified stock options. Options granted may be exercisable for a period of up to 10 years from the date of grant, excluding ISOs granted to 10% shareholders, which may be exercisable for a period of up to only five years. On April 4, 2022, the 2012 Plan expired and was not renewed. The fair value of each option award granted under the plan was estimated on the date of grant using a Black-Scholes-Merton option valuation model that uses the assumptions noted in the following table. Expected volatility was based on the historical volatility of the price of our stock. We used historical data to estimate the expected dividend yield and employee termination rates within the valuation model. The expected term of options was derived from historical exercise behavior. The risk-free rate for periods within the contractual life of the option was based on the U.S. Treasury yield curve in effect at the time of grant. ​ ​ ​ ​ ​ ​ 2022 Expected Life (Years) 7.00 ​ Dividend yield 3.08 % Interest rate 1.94 % Volatility 37.78 % ​ A summary of option activity under the stock option plans for the twelve months ended December 31, 2023 is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted ​ ​ ​ ​ ​ ​ Weighted ​ average ​ ​ ​ ​ ​ ​ ​ ​ average ​ remaining ​ Aggregate ​ ​ ​ Number of ​ exercise ​ contractual ​ intrinsic ​ ​ ​ options ​ price ​ term (years) ​ value ($) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (in Thousands) ​ Options outstanding at December 31, 2022 461,822 ​ $ 29.67 ​ ​ ​ ​ ​ ​ Plus: Options granted — ​ — ​ ​ ​ ​ ​ ​ Less: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Options exercised (46,444) ​ 25.12 ​ ​ ​ ​ ​ ​ Options expired — ​ — ​ ​ ​ ​ ​ ​ Options forfeited (31,513) ​ 24.52 ​ ​ ​ ​ ​ ​ Options outstanding at December 31, 2023 383,865 ​ 30.65 3.42 ​ $ 9,088 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Options fully vested and exercisable at December 31, 2023 232,143 ​ $ 27.80 1.96 ​ $ 6,157 ​ ​ Stock-based compensation expense included in the consolidated statements of income for the years ended December 31, 2023, 2022, and 2021 was approximately $330,000, $449,000, and $506,000, respectively. As of December 31, 2023, there was approximately $507,000 of total unrecognized stock-based compensation cost related to non-vested options granted under our plans that will be recognized over a weighted average period of 1.3 years. Other information pertaining to option activity during the twelve months ended December 31, 2023, 2022, and 2021 is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Twelve Months Ended December 31, ​ ​ 2023 ​ 2022 ​ 2021 Weighted average grant date fair value of stock options granted $ — $ 11.24 $ 10.20 ​ Total fair value of stock options vested ​ $ 514,000 ​ $ 514,000 ​ $ 1,308,000 ​ Total intrinsic value of stock options exercised ​ $ 1,060,000 ​ $ 1,670,000 ​ $ 2,536,000 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ On April 18, 2022, the Board of Directors adopted the 2022 International Bancshares Stock Appreciation Rights Plan (the “SAR Plan”). There are 750,000 shares of underlying common stock that may be used for stock appreciation right (“SAR”) grants under the plan, however, no actual shares will be granted. Upon exercise, the SAR will be settled in cash. SARs granted may be exercisable for a period of up to 10 years from the date of grant and may vest over an eight-year period. As of December 31, 2023, a total of 465,250 SARS had been issued under the SAR Plan. ​ A summary of activity under the SAR Plan for the twelve months ended December 31, 2023 is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted ​ ​ ​ ​ ​ Weighted ​ average ​ ​ ​ ​ ​ Number of ​ average ​ remaining ​ Aggregate ​ ​ stock appreciation ​ exercise ​ contractual ​ intrinsic ​ ​ rights ​ price ​ term (years) ​ value ($) ​ ​ ​ ​ ​ ​ ​ ​ ​ (in Thousands) Stock appreciation rights outstanding at December 31, 2022 489,250 ​ $ 39.35 ​ ​ ​ ​ ​ Plus: Stock appreciation rights granted ​ ​ ​ ​ ​ ​ ​ ​ ​ Less: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Stock appreciation rights exercised — ​ ​ — ​ ​ ​ ​ ​ Stock appreciation rights expired — ​ ​ — ​ ​ ​ ​ ​ Stock appreciation rights forfeited (24,000) ​ ​ 39.33 ​ ​ ​ ​ ​ Stock appreciation rights outstanding at December 31, 2023 465,250 ​ 39.35 8.50 ​ ​ 6,964 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Stock appreciation rights fully vested and exercisable at December 31, 2023 — ​ $ — ​ ​ ​ ​ ​ The fair value of the liability for payments due to stock appreciation rights holders at December 31, 2023 and December 31, 2022 is approximately $1,464,000 and $546,000, respectively, as calculated using a Black-Scholes-Merton model, and is included in other liabilities on the consolidated statements of condition. The expense recorded in connection with all grants under the SAR Plan totaled $918,000 and $546,000, respectively, for the twelve months ended December 31, 2023 and December 31, 2022. As of December 31, 2023, there was approximately $5,090,000 in unrecognized liability related to non-vested SARs granted under the plan that will be recognized over a weighted average period of 8.5 years. ​ ​

Commitments and Contingent Liab

Commitments and Contingent Liabilities and Other Matters	12 Months Ended
	Dec. 31, 2023
Commitments and Contingent Liabilities and Other Matters
Commitments and Contingent Liabilities and Other Matters	(16) Commitments, Contingent Liabilities and Other Matters On March 15, 2020, the FRB announced that it had reduced regulatory reserve requirements to zero percent effective on March 26, 2020; therefore no cash is required to be maintained to satisfy regulatory reserve requirements. We are involved in various legal proceedings that are in various stages of litigation. We have determined, based on discussions with our counsel that any material loss in such actions, individually or in the aggregate, is remote or the damages sought, even if fully recovered, would not be considered material to our consolidated statements of condition and related statements of income, comprehensive income, shareholders’ equity, and cash flows. However, many of these matters are in various stages of proceedings and further developments could cause management to revise its assessment of these matters.

Transactions with Related Parti

Transactions with Related Parties	12 Months Ended
	Dec. 31, 2023
Transactions with Related Parties
Transactions with Related Parties	(17) Transactions with Related Parties In the ordinary course of business, the Subsidiary Banks make loans to our directors and executive officers, including their affiliates, families, and companies in which they are principal owners. In the opinion of management, these loans are made on substantially the same terms, including interest rates and collateral, as those prevailing at the time for comparable transactions with other persons and do not involve more than normal risk of collectability or present other unfavorable features. The aggregate amounts receivable from such related parties amounted to approximately $13,335,000 and $28,708,000 at December 31, 2023 and 2022, respectively. ​

Financial Instruments with Off-

Financial Instruments with Off-Statement of Condition Risk and Concentrations of Credit Risk	12 Months Ended
	Dec. 31, 2023
Financial Instruments with Off-Statement of Condition Risk and Concentrations of Credit Risk
Financial Instruments with Off-Statement of Condition Risk and Concentrations of Credit Risk	(18) Financial Instruments with Off-Statement of Condition Risk and Concentrations of Credit Risk In the normal course of business, the Subsidiary Banks are party to financial instruments with off-statement of condition risk to meet the financing needs of their customers. These financial instruments include commitments to their customers. These financial instruments involve, to varying degrees, elements of credit risk in excess of the amounts recognized in the consolidated statement of condition. The contract amounts of these instruments reflect the extent of involvement the Subsidiary Banks have in particular classes of financial instruments. At December 31, 2023, the following financial amounts of instruments, whose contract amounts represent credit risks, were outstanding (in thousands): ​ ​ ​ ​ ​ Commitments to extend credit $ 3,340,280 Credit card lines ​ $ 14,181 Standby letters of credit ​ $ 147,190 Commercial letters of credit ​ $ 361 ​ We enter into a standby letter of credit to guarantee performance of a customer to a third party. These guarantees are primarily issued to support public and private borrowing arrangements. The credit risk involved is represented by the contractual amounts of those instruments. Under the standby letters of credit, we are required to make payments to the beneficiary of the letters of credit upon request by the beneficiary so long as all performance criteria have been met. At December 31, 2023, the maximum potential amount of future payments is approximately $147,190,000. At December 31, 2023, the fair value of these guarantees is not significant. Unsecured letters of credit totaled approximately $23,677,000 and $40,249,000 at December 31, 2023 and 2022, respectively. We enter into commercial letters of credit on behalf of our customers which authorize a third party to draw drafts upon us up to a stipulated amount and with specific terms and conditions. A commercial letter of credit is a conditional commitment on our part to provide payment on drafts drawn in accordance with the terms of the commercial letter of credit. The Subsidiary Banks’ exposure to credit loss in the event of nonperformance by the other party to the above financial instruments is represented by the contractual amounts of the instruments. The Subsidiary Banks use the same credit policies in making commitments and conditional obligations as they do for on-statement of condition instruments. The Subsidiary Banks control the credit risk of these transactions through credit approvals, limits, and monitoring procedures. Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates normally less than one year or other termination clauses and may require the payment of a fee. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The Subsidiary Banks evaluate each customer’s credit-worthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary by the Subsidiary Banks upon extension of credit, is based on management’s credit evaluation of the customer. Collateral held varies, but may include residential and commercial real estate, bank certificates of deposit, accounts receivable, and inventory. The Subsidiary Banks make commercial, real estate and consumer loans to customers principally located in south, central and southeast Texas and the State of Oklahoma. Although the loan portfolio is diversified, a substantial portion of its debtors’ ability to honor their contracts is dependent upon the economic conditions in these areas, especially in the real estate and commercial business sectors.

Capital Requirements

Capital Requirements	12 Months Ended
	Dec. 31, 2023
Capital Ratios
Capital Requirements	(19) Capital Requirements Bank regulatory agencies limit the amount of dividends, which the Subsidiary Banks can pay, without obtaining prior approval from such agencies. At December 31, 2023, the Subsidiary Banks could pay dividends of up to $1,229,500,000 without prior regulatory approval and without adversely affecting their “well-capitalized” status under regulatory capital rules in effect at December 31, 2023. In addition to legal requirements, regulatory authorities also consider the adequacy of the Subsidiary Banks’ total capital in relation to their deposits and other factors. These capital adequacy considerations also limit amounts available for payment of dividends. We historically have not allowed any Subsidiary Bank to pay dividends in such a manner as to impair its capital adequacy. We and the Subsidiary Banks are subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on our consolidated financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, we must meet specific capital guidelines that involve quantitative measures of our assets, liabilities, and certain off-statement of condition items as calculated under regulatory accounting practices. Our capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings, and other factors. Current quantitative measures established by regulation to ensure capital adequacy require us to maintain minimum amounts and ratios (set forth in the table on the following page) of Total and Tier 1 capital to risk-weighted assets and of Tier 1 capital to average assets. Management believes, as of December 31, 2023, that we met all capital adequacy requirements to which we are subject. In November 2017, the OCC, the FRB and the FDIC finalized a proposed rule that extends the current treatment under the regulatory capital rules for certain regulatory capital deductions and risk weights and certain minority interest requirements, as they apply to banking organizations that are not subject to the advanced approaches capital rules. Effective January 1, 2018, the rule also paused the full transition to the Basel III treatment of mortgage servicing assets, certain deferred tax assets, investments in the capital of unconsolidated financial institutions and minority interests. The agencies are also considering whether to make adjustments to the capital rules in response to CECL (the FASB Standard relating to current expected credit loss) and its potential impact on regulatory capital. Pursuant to rules issued by the federal bank regulatory agencies in February 2019 and March 2020, banking organizations were given options to phase in the adoption of CECL over a three-year transition period through December 31, 2022 or over a five-year transition period through December 31, 2024. Rather than electing to make one of the phase-in options, we immediately recognized the capital impact upon adopting CECL accounting standards on January 1, 2020, which resulted in an increase in our allowance for probable loan losses and a one-time cumulative-effect adjustment to retained earnings upon adoption. In December 2017, the Basel Committee on Banking Supervision unveiled its final set of standards and reforms to its Basel III regulatory capital framework, commonly called “Basel III Endgame” or “Basel IV.” The Basel IV framework makes changes to the capital framework first introduced as “Basel III” in 2010 and aim to reduce excessive variability in banks’ calculations of risk-weighted capital ratios. Implementation of Basel IV began on January 1, 2023 and will continue over a five-year transition period by regulators in individual countries, including the U.S. federal bank regulatory agencies (after notice and comment). On May 24, 2018, the Economic Growth, Regulatory Relief and Consumer Protection Act of 2018 (“EGRRCPA”) was enacted, and, among other things, it includes a simplified capital rule change which effectively exempts banks with assets of less than $10 billion that exceed the “community bank leverage ratio,” from all risk-based capital requirements, including Basel III and its predecessors. The federal banking agencies must establish the “community bank leverage ratio” (a ratio of tangible equity to average consolidated assets) between 8% and 10% before community banks can begin to take advantage of this regulatory relief provision. Some of the Subsidiary Banks, with assets of less than $10 billion, may qualify for this exemption. Additionally, under the EGRRCPA, qualified bank holding companies with assets of up to $3 billion (currently $1 billion) will be eligible for the Federal Reserve’s Small Bank Holding Company Policy Statement, which eases limitations on the issuance of debt by holding companies. On August 28, 2018, the Federal Reserve issued an interim final rule expanding the applicability of its Small Bank Holding Company Policy Statement. While holding companies that meet the conditions of the policy statement are excluded from consolidated capital requirements, their depository institutions continue to be subject to minimum capital requirements. Finally, for banks that continue to be subject to the risk-based capital rules of Basel III (e.g., 150%), certain commercial real estate loans that were formally classified as high volatility commercial real estate 31 (“HVCRE”) will not be subject to heightened risk weights if they meet certain criteria. Also, while acquisition, development, and construction loans will generally be subject to heightened risk weights, certain exceptions will apply. On September 18, 2018, the federal banking agencies issued a proposed rule modifying the agencies’ capital rules for HVCRE. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For Capital Adequacy ​ To Be Well-Capitalized ​ ​ ​ ​ ​ ​ ​ Purposes ​ Under Prompt Corrective ​ ​ Actual ​ Phase In Schedule ​ Action Provisions ​ ​ Amount ​ Ratio ​ Amount ​ Ratio ​ Amount ​ Ratio ​ ​ ​ ​ ​ ​ ​ (greater than ​ (greater than ​ (greater than ​ (greater than ​ ​ ​ ​ ​ ​ ​ or equal to) ​ or equal to) ​ or equal to) ​ or equal to) ​ ​ (Dollars in Thousands) As of December 31, 2023: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Common Equity Tier 1 (to Risk Weighted Assets): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ $ 2,563,130 21.72 % $ 825,968 7.000 % ​ N/A N/A ​ International Bank of Commerce, Laredo ​ 1,444,775 18.54 ​ 545,611 7.000 ​ $ 506,639 6.50 % International Bank of Commerce, Brownsville ​ ​ 477,390 ​ 24.41 ​ ​ 136,883 ​ 7.000 ​ ​ 127,106 ​ 6.50 ​ International Bank of Commerce, Oklahoma ​ 232,965 20.72 ​ 78,718 7.000 ​ 73,095 6.50 ​ Commerce Bank ​ 97,334 36.57 ​ 18,628 7.000 ​ 17,298 6.50 ​ International Bank of Commerce, Zapata ​ 64,110 31.18 ​ 14,394 7.000 ​ 13,366 6.50 ​ Total Capital (to Risk Weighted Assets): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ $ 2,790,171 23.65 % $ 1,238,952 10.500 % ​ N/A N/A ​ International Bank of Commerce, Laredo ​ 1,542,462 19.79 ​ 818,416 10.500 ​ $ 779,444 10.00 % International Bank of Commerce, Brownsville ​ ​ 500,268 ​ 25.58 ​ ​ 205,325 ​ 10.500 ​ ​ 195,547 ​ 10.00 ​ International Bank of Commerce, Oklahoma ​ 247,031 21.97 ​ 118,076 10.500 ​ 112,454 10.00 ​ Commerce Bank ​ 100,660 37.82 ​ 27,943 10.500 ​ 26,612 10.00 ​ International Bank of Commerce, Zapata ​ 66,680 32.43 ​ 21,591 10.500 ​ 20,563 10.00 ​ Tier 1 Capital (to Risk Weighted Assets): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ $ 2,642,492 22.39 % $ 1,002,961 8.500 % N/A N/A ​ International Bank of Commerce, Laredo ​ 1,444,775 18.54 ​ 662,527 8.500 ​ $ 623,555 8.00 % International Bank of Commerce, Brownsville ​ ​ 477,390 ​ 24.41 ​ ​ 166,215 ​ 8.500 ​ ​ 156,438 ​ 8.00 ​ International Bank of Commerce, Oklahoma ​ 232,965 20.72 ​ 95,586 8.500 ​ 89,963 8.00 ​ Commerce Bank ​ 97,334 36.57 ​ 22,620 8.500 ​ 21,290 8.00 ​ International Bank of Commerce, Zapata ​ 64,110 31.18 ​ 17,478 8.500 ​ 16,450 8.00 ​ Tier 1 Capital (to Average Assets): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ $ 2,642,492 17.46 % $ 605,262 4.00 % $ N/A N/A ​ International Bank of Commerce, Laredo ​ 1,444,775 16.40 ​ 352,412 4.00 ​ 440,515 5.00 % International Bank of Commerce, Brownsville ​ ​ 477,390 ​ 11.79 ​ ​ 161,919 ​ 4.00 ​ ​ 202,398 ​ 5.00 ​ International Bank of Commerce, Oklahoma ​ 232,965 14.72 ​ 63,294 4.00 ​ 79,117 5.00 ​ Commerce Bank ​ 97,334 14.50 ​ 26,858 4.00 ​ 33,572 5.00 ​ International Bank of Commerce, Zapata ​ 64,110 13.26 ​ 19,338 4.00 ​ 24,172 5.00 ​ ​ ​ Our actual capital amounts and ratios for 2022 are also presented in the following table: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ To Be Well-Capitalized ​ ​ ​ ​ ​ ​ ​ For Capital Adequacy ​ ​ Under Prompt Corrective ​ ​ Actual ​ Purposes ​ ​ Action Provisions ​ ​ Amount ​ Ratio ​ Amount ​ Ratio ​ ​ Amount Ratio ​ ​ ​ ​ ​ ​ ​ (greater than ​ (greater than ​ (greater than ​ (greater than ​ ​ ​ ​ ​ ​ ​ or equal to) ​ or equal to) ​ or equal to) ​ or equal to) ​ ​ (Dollars in Thousands) As of December 31, 2022: ​ ​ ​ ​ Common Equity Tier 1 (to Risk Weighted Assets): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ $ 2,232,723 ​ 20.21 % $ 773,398 7.000 % ​ N/A N/A ​ International Bank of Commerce, Laredo ​ 1,310,616 ​ 18.07 ​ 507,625 7.000 ​ $ 471,366 6.50 % International Bank of Commerce, Oklahoma ​ ​ 363,093 ​ 20.86 ​ ​ 121,855 ​ 7.000 ​ ​ 113,151 ​ 6.50 ​ International Bank of Commerce, Brownsville ​ 232,689 ​ 21.17 ​ 76,941 7.000 ​ 71,445 6.50 ​ International Bank of Commerce, Zapata ​ 98,087 ​ 42.26 ​ 16,248 7.000 ​ 15,088 6.50 ​ Commerce Bank ​ 71,418 ​ 37.70 ​ 13,261 7.000 ​ 12,314 6.50 ​ Total Capital (to Risk Weighted Assets): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ $ 2,455,468 ​ 22.22 % $ 1,160,096 10.500 % ​ N/A N/A % International Bank of Commerce, Laredo ​ 1,401,298 ​ 19.32 ​ 761,438 10.500 ​ $ 725,179 10.00 ​ International Bank of Commerce, Oklahoma ​ ​ 383,804 ​ 22.05 ​ ​ 182,782 ​ 10.500 ​ ​ 174,078 ​ 10.00 ​ International Bank of Commerce, Brownsville ​ 243,739 ​ 22.18 ​ 115,412 10.500 ​ 109,916 10.00 ​ International Bank of Commerce, Zapata ​ 100,798 ​ 43.43 ​ 24,372 10.500 ​ 23,212 10.00 ​ Commerce Bank ​ 73,420 ​ 38.76 ​ 19,892 10.500 ​ 18,945 10.00 ​ Tier 1 Capital (to Risk Weighted Assets): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ % Consolidated ​ $ 2,324,903 ​ 21.04 % $ 939,126 8.500 % N/A N/A ​ International Bank of Commerce, Laredo ​ 1,310,616 ​ 18.07 ​ 616,402 8.500 ​ $ 580,143 8.00 ​ International Bank of Commerce, Oklahoma ​ ​ 363,093 ​ 20.86 ​ ​ 147,966 ​ 8.500 ​ ​ 139,262 ​ 8.00 ​ International Bank of Commerce, Brownsville ​ 232,689 ​ 21.17 ​ 93,429 8.500 ​ 87,933 8.00 ​ International Bank of Commerce, Zapata ​ 98,087 ​ 42.26 ​ 19,730 8.500 ​ 18,569 8.00 ​ Commerce Bank ​ 71,418 ​ 37.70 ​ 16,103 8.500 ​ 15,156 8.00 % Tier 1 Capital (to Average Assets): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ $ 2,324,903 ​ 14.59 % $ 637,578 4.00 % $ N/A N/A ​ International Bank of Commerce, Laredo ​ 1,310,616 ​ 13.09 ​ 400,489 4.00 ​ 500,611 5.00 ​ International Bank of Commerce, Oklahoma ​ ​ 363,093 ​ 8.95 ​ ​ 162,246 ​ 4.00 ​ ​ 202,808 ​ 5.00 ​ International Bank of Commerce, Brownsville ​ 232,689 ​ 13.48 ​ 69,028 4.00 ​ 86,286 5.00 ​ International Bank of Commerce, Zapata ​ 98,087 ​ 14.39 ​ 27,270 4.00 ​ 34,088 5.00 ​ Commerce Bank ​ 71,418 ​ 15.00 ​ 19,048 4.00 ​ 23,811 5.00 ​ ​ ​

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2023
Fair Value Measurements
Fair Value Measurements	(20) Fair Value ASC Topic 820, “Fair Value Measurements and Disclosures” (“ASC 820”) defines fair value, establishes a framework for measuring fair value in generally accepted accounting principles, and expands disclosures about fair value measurements. ASC 820 applies to all financial instruments that are being measured and reported on a fair value basis. ASC 820 defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date; it also establishes a fair value hierarchy that prioritizes the inputs used in valuation methodologies into the following three levels: ● Level 1 Inputs—Unadjusted quoted prices in active markets for identical assets or liabilities. ● Level 2 Inputs—Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. ● Level 3 Inputs—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Level 3 assets and liabilities include financial instruments whose value is determined using pricing models, discounted cash flow methodologies, or other valuation techniques, as well as instruments for which the determination of fair value requires significant management judgment or estimation. ​ A description of the valuation methodologies used for instruments measured at fair value, as well as the general classification of such instruments pursuant to the valuation hierarchy is set forth below. The following table represents financial instruments reported on the consolidated statements of condition at their fair value as of December 31, 2023 by level within the fair value measurement hierarchy. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair Value Measurements at ​ ​ ​ ​ ​ ​ Reporting Date Using ​ ​ ​ ​ ​ ​ (in Thousands) ​ ​ ​ ​ ​ ​ Quoted ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Prices in ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Active ​ Significant ​ ​ ​ ​ ​ ​ Assets/Liabilities ​ Markets for ​ Other ​ Significant ​ ​ ​ Measured at ​ Identical ​ Observable ​ Unobservable ​ ​ ​ Fair Value ​ Assets ​ Inputs ​ Inputs ​ ​ ​ December 31, 2023 ​ (Level 1) ​ (Level 2) ​ (Level 3) ​ Measured on a recurring basis: ​ ​ ​ ​ ​ Assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Available for sale debt securities ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential mortgage-backed securities ​ $ 4,660,099 ​ $ — ​ $ 4,660,099 ​ $ — ​ States and political subdivisions ​ 162,242 ​ — ​ 162,242 ​ — ​ Equity Securities ​ 5,417 ​ 5,417 ​ ​ — ​ — ​ ​ ​ $ 4,827,758 ​ $ 5,417 ​ $ 4,822,341 ​ $ — ​ ​ The following table represents financial instruments reported on the consolidated balance sheets at their fair value as of December 31, 2022 by level within the fair value measurement hierarchy. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair Value Measurements at ​ ​ ​ ​ ​ ​ Reporting Date Using ​ ​ ​ ​ ​ ​ (in Thousands) ​ ​ ​ ​ ​ ​ Quoted ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Prices in ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Active ​ Significant ​ ​ ​ ​ ​ ​ Assets/Liabilities ​ Markets for ​ Other ​ Significant ​ ​ ​ Measured at ​ Identical ​ Observable ​ Unobservable ​ ​ ​ Fair Value ​ Assets ​ Inputs ​ Inputs ​ ​ ​ December 31, 2022 ​ (Level 1) ​ (Level 2) ​ (Level 3) ​ Measured on a recurring basis: ​ ​ ​ ​ ​ Assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Available for sale securities ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. Treasury securities ​ $ 49,393 ​ $ — ​ $ 49,393 ​ $ — ​ Residential mortgage-backed securities ​ ​ 4,209,212 ​ ​ — ​ ​ 4,209,212 ​ ​ — ​ States and political subdivisions ​ 159,191 ​ — ​ 159,191 ​ — ​ Equity Securities ​ 5,358 ​ 5,358 ​ — ​ — ​ ​ ​ $ 4,423,154 ​ $ 5,358 ​ $ 4,417,796 ​ $ — ​ ​ For the years ended December 31, 2023 and December 31, 2022, debt investment securities available-for-sale are classified within Level 2 of the valuation hierarchy. Equity securities with readily determinable fair values are classified within Level 1. For debt securities classified as Level 2 in the fair value hierarchy, we obtain fair value measurements from an independent pricing service. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information, and the bond’s terms and conditions, among other things. Certain financial instruments are measured at fair value on a nonrecurring basis. They are not measured at fair value on an ongoing basis but are subject to fair value adjustments in certain circumstances (for example, when there is evidence of impairment). The following table represents financial instruments measured at fair value on a non-recurring basis as of and for the period ended December 31, 2023 by level within the fair value measurement hierarchy: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair Value Measurements at Reporting ​ ​ ​ ​ ​ ​ ​ ​ Date Using ​ ​ ​ ​ ​ ​ ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ Quoted ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Assets/Liabilities ​ Prices in ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Measured at ​ Active ​ Significant ​ ​ ​ ​ ​ ​ ​ ​ Fair Value ​ Markets for ​ Other ​ Significant ​ Net ​ ​ Period ended ​ Identical ​ Observable ​ Unobservable ​ Provision ​ ​ December 31, ​ Assets ​ Inputs ​ Inputs ​ During ​ ​ 2023 ​ (Level 1) ​ (Level 2) ​ (Level 3) ​ Period Measured on a non-recurring basis: ​ ​ ​ ​ ​ Assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Watch-List doubtful loans ​ $ 46,124 ​ $ — ​ $ — ​ $ 46,124 ​ $ 10,221 Other real estate owned ​ ​ 307 ​ ​ — ​ ​ — ​ ​ 307 ​ ​ 2,538 ​ The following table represents financial instruments measured at fair value on a non-recurring basis as of and for the year ended December 31, 2022 by level within the fair value measurement hierarchy: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair Value Measurements at Reporting ​ ​ ​ ​ ​ ​ ​ ​ Date Using ​ ​ ​ ​ ​ ​ ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ Quoted ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Assets/Liabilities ​ Prices in ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Measured at ​ Active ​ Significant ​ ​ ​ ​ ​ ​ ​ ​ Fair Value ​ Markets ​ Other ​ Significant ​ Net ​ ​ Year ended ​ for Identical ​ Observable ​ Unobservable ​ Provision ​ ​ December 31, ​ Assets ​ Inputs ​ Inputs ​ During ​ ​ 2022 ​ (Level 1) ​ (Level 2) ​ (Level 3) ​ Period Measured on a non-recurring basis: ​ ​ ​ ​ ​ Assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Watch-List doubtful loans ​ $ 30,743 ​ $ — ​ $ — ​ $ 30,743 ​ $ 2,346 Other real estate owned ​ 5,653 ​ — ​ — ​ 5,653 ​ 1,627 ​ Our assets measured at fair value on a non-recurring basis are limited to loans classified as Watch List – Doubtful and other real estate owned. The fair value of Watch-List Doubtful loans is derived in accordance with FASB ASC 310, “Receivables”. They are primarily comprised of collateral-dependent commercial loans. As the primary sources of loan repayments decline, the secondary repayment source, the collateral, takes on greater significance. Correctly evaluating the fair value becomes even more important. Re-measurement of the loan to fair value is done through a specific valuation allowance included in the ACL. The fair value of the loan is based on the fair value of the collateral, as determined through either an appraisal or evaluation process. The basis for our appraisal and appraisal review process is based on regulatory guidelines and strives to comply with all regulatory appraisal laws, regulations, and the Uniform Standards of Professional Appraisal Practice. All appraisals and evaluations are “as is” (the property’s highest and best use) valuations based on the current conditions of the property/project at that point in time. The determination of the fair value of the collateral is based on the net realizable value, which is the appraised value less any closing costs, when applicable. As of December 31, 2023, we had approximately $46,491,000 of doubtful commercial collateral dependent loans, of which approximately $1,272,000 had an appraisal performed within the immediately preceding twelve months and of which approximately $35,061,000 had an evaluation performed within the immediately preceding twelve months. As of December 31, 2022, we had approximately $51,326,000 of doubtful commercial collateral dependent loans, of which approximately $0 had an appraisal performed within the immediately preceding twelve months and of which approximately $51,326,000 had an evaluation performed within the immediately preceding twelve months. The determination to either seek an appraisal or to perform an evaluation begins in weekly credit quality meetings, where the committee analyzes the existing collateral values of the doubtful loans and where obsolete appraisals are identified. In order to determine whether we would obtain a new appraisal or perform an internal evaluation to determine the fair value of the collateral, the credit committee reviews the existing appraisal to determine if the collateral value is reasonable in view of the current use of the collateral and the economic environment related to the collateral. If the analysis of the existing appraisal does not find that the collateral value is reasonable under the current circumstances, we would obtain a new appraisal on the collateral or perform an internal evaluation of the collateral. The ultimate decision to get a new appraisal rests with the independent credit administration group. A new appraisal is not required if an internal evaluation, as performed by in-house experts, is able to appropriately update the original appraisal assumptions to reflect current market conditions and provide an estimate of the collateral’s market value for impairment analysis. The internal evaluations must be in writing and contain sufficient information detailing the analysis, assumptions, and conclusions and they must support performing an evaluation in lieu of ordering a new appraisal. Other real estate owned is comprised of real estate acquired by foreclosure and deeds in lieu of foreclosure. Other real estate owned is carried at the lower of the recorded investment in the property or its fair value less estimated costs to sell such property (as determined by independent appraisal) within Level 3 of the fair value hierarchy. Prior to foreclosure, the value of the underlying loan is written down to the fair value of the real estate to be acquired by a charge to the ACL (formerly allowance for probable loan losses), if necessary. The fair value is reviewed periodically, and subsequent write downs are made accordingly through a charge to operations. Other real estate owned is included in other assets on the consolidated financial statements. For the twelve months ended December 31, 2023, 2022, and 2021, we recorded approximately $0, $2,000, and $2,000, respectively, in charges to the ACL in connection with loans transferred to other real estate owned. For the twelve months ended December 31, 2023, 2022, and 2021, we recorded approximately $2,538,000, $1,627,000, and $2,655,000, respectively, in adjustments to fair value in connection with other real estate owned. The fair value estimates, methods, and assumptions for our financial instruments at December 31, 2023 and December 31, 2022 are outlined below. Cash and Cash Equivalents For these short-term instruments, the carrying amount is a reasonable estimate of fair value. Investment securities held-to-maturity The carrying amounts of investments held-to-maturity approximate fair value. Investment Securities For debt investment securities, which may include U.S. Treasury securities, obligations of other U.S. government agencies, obligations of states and political subdivisions and mortgage pass through and related securities, fair values are from an independent pricing service. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the bond’s terms and conditions, among other things. See disclosures of fair value of investment securities in Note 2 – Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments. Loans Fair values are estimated for portfolios of loans with similar financial characteristics. Loans are segregated by type such as commercial, real estate and consumer loans as outlined by regulatory reporting guidelines. Each category is segmented into fixed and variable interest rate terms and by performing and non-performing categories. For variable rate performing loans, the carrying amount approximates the fair value. For fixed rate performing loans, except residential mortgage loans, the fair value is calculated by discounting scheduled cash flows through the estimated maturity using estimated market discount rates that reflect the credit and interest rate risk inherent in the loan. For performing residential mortgage loans, fair value is estimated by discounting contractual cash flows adjusted for prepayment estimates using discount rates based on secondary market sources or the primary origination market. Fixed rate performing loans are within Level 3 of the fair value hierarchy. At December 31, 2023 and December 31, 2022, the carrying amount of fixed rate performing loans was $1,199,347,000 and $1,203,381,000, respectively, and the estimated fair value was $1,073,892,000 and $1,100,848,000, respectively. Accrued Interest The carrying amounts of accrued interest approximate fair value. Deposits The fair value of deposits with no stated maturity, such as non-interest bearing demand deposit accounts, savings accounts and interest-bearing demand deposit accounts, was equal to the amount payable on demand as of December 31, 2023 and December 31, 2022. The fair value of time deposits is based on the discounted value of contractual cash flows. The discount rate is based on currently offered rates. Time deposits are within Level 3 of the fair value hierarchy. At December 31, 2023 and December 31, 2022, the carrying amount of time deposits was $2,425,177,000 and $2,068,184,000, respectively, and the estimated fair value was $2,428,681,000 and $2,076,231,000, respectively. Securities Sold Under Repurchase Agreements Securities sold under repurchase agreements are short-term maturities. Due to the contractual terms of the instruments, the carrying amounts approximated fair value at December 31, 2023 and December 31, 2022. Junior Subordinated Deferrable Interest Debentures We currently have floating rate junior subordinated deferrable interest debentures outstanding. Due to the contractual terms of the floating rate junior subordinated deferrable interest debentures, the carrying amounts approximated fair value at December 31, 2023 and December 31, 2022. Other Borrowed Funds We currently have long-term borrowings issued from the Federal Home Loan Bank (“FHLB”). The long-term borrowings outstanding at December 31, 2023 and December 31, 2022 are fixed-rate borrowings and the fair value is based on established market spreads for similar types of borrowings. The fixed-rate long-term borrowings are included in Level 2 of the fair value hierarchy. At December 31, 2023 and December 31, 2022 the carrying amount of the fixed-rate long-term FHLB borrowings was $10,745,000 and $10,944,000, respectively, and the estimated fair value was $10,745,000 and $10,944,000, respectively. Commitments to Extend Credit and Letters of Credit Commitments to extend credit and fund letters of credit are principally at current interest rates and therefore the carrying amount approximates fair value. Limitations Fair value estimates are made at a point in time, based on relevant market information and information about the financial instrument. These estimates do not reflect any premium or discount that could result from offering for sale at one time of our entire holdings of a particular financial instrument. Because no market exists for a significant portion of our financial instruments, fair value estimates are based on judgments regarding future expected loss experience, current economic conditions, risk characteristics of various financial instruments, and other factors. These estimates are subjective in nature and involve uncertainties and matters of significant judgment and therefore cannot be determined with precision. Changes in assumptions could significantly affect the estimates. Fair value estimates are based on existing on-and off-statement of condition financial instruments without attempting to estimate the value of anticipated future business and the value of assets and liabilities that are not considered financial instruments. Other significant assets and liabilities that are not considered financial assets or liabilities include the bank premises and equipment and core deposit value. In addition, the tax ramifications related to the effect of fair value estimates have not been considered in the above estimates.

International Bancshares Corpor

International Bancshares Corporation (Parent Company Only) Financial Information Statements of Condition	12 Months Ended
	Dec. 31, 2023
International Bancshares Corporation (Parent Company Only) Financial Information Statements of Condition
International Bancshares Corporation (Parent Company Only) Financial Information Statements of Condition	(21) International Bancshares Corporation (Parent Company Only) Financial Information Statements of Condition (Parent Company Only) December 31, 2023 and 2022 (Dollars in Thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 ASSETS ​ ​ ​ ​ ​ ​ ​ Cash ​ $ 105,184 ​ $ 89,263 ​ Other investments ​ 111,382 ​ 114,901 ​ Net loans ​ 62,150 ​ 42,519 ​ Investment in subsidiaries ​ 2,281,952 ​ 1,933,269 ​ Goodwill ​ ​ 3,365 ​ ​ 3,365 ​ Other assets ​ 8,617 ​ 7,181 ​ Total assets ​ $ 2,572,650 ​ $ 2,190,498 ​ LIABILITIES AND SHAREHOLDERS’ EQUITY ​ ​ ​ ​ ​ ​ ​ Liabilities: ​ ​ ​ ​ ​ ​ ​ Junior subordinated deferrable interest debentures ​ $ 108,868 ​ $ 134,642 ​ Due to IBC Trading ​ 21 ​ 21 ​ Other liabilities ​ 15,987 ​ 11,076 ​ Total liabilities ​ 124,876 ​ 145,739 ​ Shareholders’ equity: ​ ​ ​ ​ ​ ​ ​ Common shares ​ 96,467 ​ 96,420 ​ Surplus ​ 155,511 ​ 154,061 ​ Retained earnings ​ 3,029,088 ​ 2,695,567 ​ Accumulated other comprehensive loss ​ (397,889) ​ (470,497) ​ ​ ​ 2,883,177 ​ 2,475,551 ​ Less cost of shares in treasury ​ (435,403) ​ (430,792) ​ Total shareholders’ equity ​ 2,447,774 ​ 2,044,759 ​ Total liabilities and shareholders’ equity ​ $ 2,572,650 ​ $ 2,190,498 ​ ​

International Bancshares Corp_2

International Bancshares Corporation (Parent Company Only) Financial Information Statements of Income	12 Months Ended
	Dec. 31, 2023
International Bancshares Corporation (Parent Company Only) Financial Information Statements of Income
International Bancshares Corporation (Parent Company Only) Financial Information Statements of Income	(22) International Bancshares Corporation (Parent Company Only) Financial Information Statements of Income (Parent Company Only) Years ended December 31, 2023, 2022 and 2021 (Dollars in Thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 2021 Income: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Dividends from subsidiaries ​ $ 179,000 ​ $ 222,175 ​ $ 80,882 ​ Interest income on notes receivable ​ 5,769 ​ 2,394 ​ 1,139 ​ (Loss) income on other investments ​ (6,150) ​ 8,662 ​ 9,662 ​ Other ​ 4 ​ 857 ​ 58 ​ Total income ​ 178,623 ​ 234,088 ​ 91,741 ​ Expenses: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest expense (Debentures) ​ 8,122 ​ 5,037 ​ 2,792 ​ Provision for credit loss ​ ​ 500 ​ ​ 437 ​ ​ — ​ Other ​ 252 ​ 2,291 ​ 2,272 ​ Total expenses ​ 8,874 ​ 7,765 ​ 5,064 ​ Income before federal income taxes and equity in undistributed net income of subsidiaries ​ 169,749 ​ 226,323 ​ 86,677 ​ Income tax (benefit) expense ​ (1,365) ​ 504 ​ 1,358 ​ Income before equity in undistributed net income of subsidiaries ​ 171,114 ​ 225,819 ​ 85,319 ​ Equity in undistributed net income of subsidiaries ​ 240,654 ​ 74,413 ​ 168,603 ​ Net income ​ $ 411,768 ​ $ 300,232 ​ $ 253,922 ​ ​

International Bancshares Corp_3

International Bancshares Corporation (Parent Company Only) Financial Information Statements of Cash Flows	12 Months Ended
	Dec. 31, 2023
International Bancshares Corporation (Parent Company Only) Financial Information Statements of Cash Flows
International Bancshares Corporation (Parent Company Only) Financial Information Statements of Cash Flows	(23) International Bancshares Corporation (Parent Company Only) Financial Information Statements of Cash Flows (Parent Company Only) Years ended December 31, 2023, 2022 and 2021 (Dollars in Thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 2021 Operating activities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net income ​ $ 411,768 ​ $ 300,232 ​ $ 253,922 ​ Adjustments to reconcile net income to net cash provided by operating activities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Provision for credit loss ​ ​ 500 ​ ​ 437 ​ ​ — ​ Unrealized (gain) loss on equity securities with readily determinable fair values ​ ​ (14) ​ ​ 36 ​ ​ (51) ​ Stock compensation expense ​ 330 ​ 449 ​ 506 ​ Increase (decrease) in other liabilities ​ 4,911 ​ 1,743 ​ (8,084) ​ Equity in undistributed net income of subsidiaries ​ (240,654) ​ (74,413) ​ (168,603) ​ Net cash provided by operating activities ​ 176,841 ​ 228,484 ​ 77,690 ​ Investing activities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net (increase) decrease in notes receivable ​ (20,170) ​ (32,556) ​ 1,549 ​ Increase in other assets and other investments ​ (33,285) ​ (43,343) ​ (11,787) ​ Net cash used in investing activities ​ (53,455) ​ (75,899) ​ (10,238) ​ Financing activities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Redemption of long-term debt ​ (25,774) ​ — ​ — ​ Proceeds from stock transactions ​ 1,167 ​ 1,537 ​ 2,414 ​ Payments of cash dividends - common ​ (78,247) ​ (75,375) ​ (72,838) ​ Purchase of treasury stock ​ (4,611) ​ (52,048) ​ (716) ​ Net cash used in financing activities ​ (107,465) ​ (125,886) ​ (71,140) ​ Increase (decrease) in cash ​ 15,921 ​ 26,699 ​ (3,688) ​ Cash at beginning of year ​ 89,263 ​ 62,564 ​ 66,252 ​ Cash at end of year ​ $ 105,184 ​ $ 89,263 ​ $ 62,564 ​ ​

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2023
Summary of Significant Accounting Policies
Consolidation and Basis of Presentation	Consolidation and Basis of Presentation Our consolidated financial statements include the accounts of the International Bancshares Corporation, its wholly owned Subsidiary Banks and its wholly owned non-bank subsidiaries, IBC Trading Company, Premier Tierra Holdings, Inc., IBC Charitable and Community Development Corporation, IBC Capital Corporation and Diamond Beach Holdings, LLC. All significant inter-company balances and transactions have been eliminated in consolidation. We, through our Subsidiary Banks, are primarily engaged in the business of banking, including the acceptance of checking and savings deposits and the making of commercial, real estate, personal, home improvement, automobile, and other installment and term loans. Our primary markets are north, south, central, and southeast Texas and the state of Oklahoma. Each of our Subsidiary Banks is highly active in facilitating international trade along the United States border with Mexico and elsewhere. Although our loan portfolio is diversified, the ability of our debtors to honor their contracts is primarily dependent upon the economic conditions in our trade area. In addition, the investment portfolio is directly impacted by fluctuations in market interest rates. We are subject to the regulations of certain federal agencies as well as the Texas Department of Banking and the Oklahoma Department of Banking and undergo periodic examinations by those regulatory authorities. Such agencies may require certain standards or impose certain limitations based on their judgments or changes in law and regulations. We own one insurance-related subsidiary, IBC Insurance Agency, Inc., a wholly owned subsidiary of our Subsidiary Bank, International Bank of Commerce, Laredo. The insurance-related subsidiary does not conduct underwriting activities. The preparation of the consolidated financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the dates of the statement of condition and income and expenses for the periods. Actual results could differ significantly from those estimates. Material estimates that are particularly susceptible to significant changes in the near-term relate to the determination of the allowance for credit losses (“ACL”).
Subsequent Events	Subsequent Events We have evaluated all events or transactions that occurred through the date we issued these financial statements. During this period, we did not have any material recognizable or non-recognizable subsequent events.
Investment Securities	Investment Securities We classify debt securities into one of these categories: held-to-maturity, available-for-sale, or trading. Such classifications are reassessed for appropriate classification at each reporting date. Securities that are intended and expected to be held until maturity are classified as “held-to-maturity” and are carried at amortized cost for financial statement reporting. Securities that are not positively expected to be held until maturity but are intended to be held for an indefinite period of time are classified as “available-for-sale” or “trading” and are carried at their fair value. Unrealized holding gains and losses are included in net income for those securities classified as “trading,” while unrealized holding gains and losses related to those securities classified as “available-for-sale” are excluded from net income and reported net of tax as other comprehensive income (loss) and in shareholders’ equity as accumulated other comprehensive income (loss) until realized. Unrealized gains and losses related to equity securities with readily determinable fair values are included in net income. Available-for-sale and held-to-maturity debt securities in an unrealized loss position are evaluated for the underlying cause of the loss. In the event that the deterioration in value is attributable to credit related reasons, then the amount of credit-related impairment would be recorded as a charge to our ACL with subsequent changes in the amount of impairment, up or down, also recorded through our ACL. The exception to this process will occur if we intend to sell an impaired available- for-sale debt security or if we will more likely than not be required to sell a credit impaired available-for-sale debt security prior to the value recovering to the security’s amortized cost. In those situations, the entire credit-related impairment amount would be required to be recognized in earnings. We have evaluated the debt securities classified as available-for-sale and held-to-maturity at December 31, 2023 and have determined that no debt securities in an unrealized loss position are arising from credit related reasons and have therefore not recorded any allowances for debt securities in our ACL for the periods. We did not maintain any trading securities during the three-year period ended December 31, 2023. Mortgage-backed securities held at December 31, 2023 and 2022 represent participating interests in pools of long-term first mortgage loans originated and serviced by the issuers of the securities. Mortgage-backed securities are either issued or guaranteed by the U.S. government or its agencies including Freddie Mac, Fannie Mae, Ginnie Mae or other non-government entities. Investments in residential mortgage-backed securities issued by Ginnie Mae are fully guaranteed by the U. S. government. Investments in residential mortgage-backed securities issued by Freddie Mac and Fannie Mae are not fully guaranteed by the U.S. government; however, we believe that the quality of the bonds is similar to other AAA rated bonds with limited credit risk, particularly given the placement of Fannie Mae and Freddie Mac into conservatorship by the federal government in 2008 and because securities issued by others that are collateralized by residential mortgage-backed securities issued by Fannie Mae or Freddie Mac are rated consistently as AAA rated securities. Market interest rate fluctuations can affect the prepayment speed of principal and the yield on the security. Premiums and discounts are amortized using the level yield or “interest method” over the terms of the securities. Declines in the fair value of held-to-maturity and available-for sale-securities below their cost that are deemed to be other than temporary are reflected in earnings as realized losses. In determining whether other-than-temporary impairment exists, management considers many factors, including (i) the length of time and the extent to which the fair value has been less than cost, (ii) the financial condition and near-term prospects of the issuer, and (iii) our intent to hold and our determination of whether we will more likely than not be required to sell the security prior to a recovery in fair value. If we determine that (i) we intend to sell the security or (ii) it is more likely than not that we will be required to sell the security before it’s anticipated recovery, the other-than-temporary impairment that is recognized in earnings is equal to the difference between the fair value of the security and our amortized cost of the security. If we determine that we (i) do not intend to sell the security and (ii) we will not be more likely than not required to sell the security before it’s anticipated recovery, the other-than-temporary impairment is segregated into its two components (i) the amount of impairment related to credit loss and (ii) the amount of impairment related to other factors. The difference between the present value of the cash flows expected to be collected and the amortized cost is the credit loss recognized through earnings and an adjustment to the cost basis of the security. The amount of impairment related to other factors is included in other comprehensive income (loss). Gains and losses on the sale of securities are recorded on the trade date and are determined using the specific identification method.
Equity Securities	Equity Securities
Loans, Provisions and Allowances for Credit Losses and Doubtful Loans	Provision and Allowance for Credit Losses Our ACL is based on an expected credit loss model that recognizes credit losses over the life of a financial asset. Expected credit losses capture historical information, current conditions, and reasonable and supportable forecasts of future conditions. The ACL is deducted from the amortized cost of an instrument to present the net amount expected to be collected on the financial asset. Our ACL primarily consists of the aggregate ACL estimates of our Subsidiary Banks. The estimates are established through charges to operations in the form of charges to provisions for credit loss expense. Loan losses or recoveries are charged or credited directly to the ACL. The ACL of each Subsidiary Bank is maintained at a level considered appropriate by management, based on estimated current expected credit losses in the current loan portfolio, including information about past events, current conditions, and reasonable and supportable forecasts. Our management continually reviews the ACL of the Subsidiary Banks using the amounts determined from the estimates established on specific doubtful loans, the estimate established on quantitative historical loss percentages, and the estimate based on qualitative current conditions and reasonable and supportable two-year forecasted data. Our methodology reverts to the average lifetime loss-rate beyond the forecast period when we can no longer develop reasonable and supportable forecasts. Should any of the factors considered by management in evaluating the adequacy of the estimate for current expected credit losses change, our estimate of current expected credit losses could also change, which could affect the level of future credit loss expense. While the calculation of our ACL utilizes management’s best judgment and all information reasonably available, the adequacy of the ACL is dependent on a variety of factors beyond our control, including, among other things, the performance of the entire loan portfolio, the economy, government actions, changes in interest rates, and the view of regulatory authorities towards loan classifications. We believe that the allowance for probable loan losses is adequate. The Subsidiary Banks charge-off that portion of any loan which management considers to represent a loss as well as that portion of any other loan which is classified as a “loss” by bank examiners. Commercial, financial, and agricultural or real estate loans are generally considered by management to represent a loss, in whole or part, (i) when an exposure beyond any collateral coverage is apparent, (ii) when no further collection of the portion of the loan so exposed is anticipated based on actual results, (iii) when the credit enhancements, if any, are not adequate, and (iv) when the borrower’s financial condition would indicate so. Generally, unsecured consumer loans are charged-off when 90 days past due. Loans Loans are reported at the principal balance outstanding, net of unearned discounts. Interest income on loans is reported on an accrual basis. Loan fees and costs associated with originating the loans are accreted or amortized over the life of the loan using the interest method. We originate mortgage loans that may subsequently be sold to an unaffiliated third party. The loans are not securitized and if sold, are sold without recourse. Loans held for sale are carried at cost and the principal amount outstanding is not significant to the consolidated financial statements. Doubtful Loans Doubtful loans are those loans where it is probable that all amounts due according to contractual terms of the loan agreement will not be collected. Doubtful loans are measured based on (i) the present value of expected future cash flows discounted at the loan’s effective interest rate; (ii) the loan’s observable market price; or (iii) the fair value of the collateral if the loan is collateral dependent. Substantially all our doubtful loans are measured at the fair value of the collateral. In limited cases, we may use other methods to determine the level of impairment of a loan if such loan is not collateral dependent. Troubled Loan Modifications
Non-Accrual Loans	Non-Accrual Loans The non-accrual loan policy of our Subsidiary Banks is to discontinue the accrual of interest on loans when management determines that it is probable that future interest accruals will be un-collectible. As it relates to consumer loans, management charges-off those loans when the loan is contractually 90 days past due. Under special circumstances, a consumer or non-consumer loan may be more than 90 days delinquent as to interest or principal and not be placed on non-accrual status. This situation generally results when a Subsidiary Bank has a borrower who is experiencing financial difficulties, but not to the extent that requires a restructuring of indebtedness. The majority of this category is composed of loans that are considered to be adequately secured and/or for which there are expected future payments. When a loan is placed on non-accrual status, any interest accrued, not paid is reversed and charged to operations against interest income. As it relates to non-consumer loans that are not 90 days past due, management will evaluate each of these loans to determine if placing the loan on non-accrual status is warranted. Interest income on non-accrual loans is recognized only to the extent payments are received or when, in management’s opinion, the debtor’s financial condition warrants reestablishment of interest accruals.
Other Real Estate Owned and Repossessed Assets	Other Real Estate Owned and Repossessed Assets Other real estate owned is comprised of real estate acquired by foreclosure and deeds in lieu of foreclosure. Other real estate is carried at the lower of the recorded investment in the property or its fair value less estimated costs to sell such property (as determined by independent appraisal). Prior to foreclosure, the value of the underlying loan is written down to the fair value of the real estate to be acquired by a charge to the ACL, if necessary. Any subsequent write-downs are charged against other non-interest expense through a valuation allowance. Other real estate owned totaled approximately $26,728,000 and $30,144,000 at December 31, 2023 and 2022, respectively. Other real estate owned is included in other assets. Repossessed assets consist primarily of non-real estate assets acquired by foreclosure. Prior to foreclosure, the value of the underlying loan is written down to the fair value of the asset to be repossessed by a charge to the ACL, if necessary. Repossessed assets are included in other assets on the consolidated financial statements and totaled approximately $236,000 and $4,637,000 at December 31, 2023 and 2022, respectively.
Bank Premises and Equipment	Bank Premises and Equipment Bank premises and equipment are stated at cost less accumulated depreciation. Depreciation is computed on straight-line and accelerated methods over the estimated useful lives of the assets. Repairs and maintenance are charged to operations as incurred and expenditures for renewals and betterments are capitalized. We primarily own all the property we occupy, with the exception of certain branches operating in grocery store or retail shopping centers and certain ATM locations, which are all under operating leases as classified under guidance prior to the issuance of ASU 2016-02, “Leases (Topic 842).”
Other Investments	Other Investments Other investments include equity investments in non-financial companies, as well as equity securities with no readily determinable fair market value. Equity investments are accounted for using the equity method of accounting. Equity securities with no readily determinable fair value are accounted for using the cost method.
Revenue recognition	Revenue Recognition
Income Taxes	Income Taxes Deferred income tax assets and liabilities are determined using the asset and liability method. Under this method, the net deferred tax asset or liability is determined based on the tax effects of the differences between the book and tax basis of the various balance sheet assets and liabilities and gives current recognition to changes in tax rates and laws. We file a consolidated federal income tax return with our subsidiaries. Recognition of deferred tax assets is based on management’s assessment that the benefit related to certain temporary differences, tax operating loss carry forwards, and tax credits are more likely than not to be realized. A valuation allowance is recorded for the amount of the deferred tax items for which it is more likely than not that the tax benefits will not be realized. We evaluate uncertain tax positions at the end of each reporting period. We may recognize the tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. The tax benefit recognized in the financial statements from any such a position is measured based on the largest benefit that has a greater than fifty percent likelihood of being realized upon ultimate settlement. As of December 31, 2023 and 2022, respectively, after evaluating all uncertain tax positions, we have recorded no liability for unrecognized tax benefits at the end of the reporting period. We would recognize any interest accrued on unrecognized tax benefits as other interest expense and penalties as other non-interest expense. During the years ended December 31, 2023, 2022, and 2021, we recognized no interest expense or penalties related to uncertain tax positions. We file consolidated tax returns in the U.S. federal jurisdiction and various state jurisdictions. We are no longer subject to U.S. federal or state income tax examinations by tax authorities for years before 2020.
Stock Options and Stock Appreciation Rights	Stock Options and Stock Appreciation Rights Compensation expense for stock-based awards is based on the market price of the stock on the measurement date, which is generally the date of grant, and is recognized ratably over the service period of the award. The fair value of stock options and stock appreciation rights granted was estimated using a Black-Scholes-Merton pricing model. These models were developed for use in estimating the fair value of publicly traded options and stock appreciation rights that have no vesting restrictions and are fully transferable. Additionally, these models require the input of highly subjective assumptions. Because our employee stock options and stock appreciation rights have characteristics significantly different from those of publicly traded options and appreciation rights, and because changes in the subjective input assumptions can materially affect the fair value estimate, in management’s opinion, the Black-Scholes-Merton pricing models do not necessarily provide a reliable single measure of the fair value of our stock options and stock appreciation rights.
Net Income Per Share	Net Income Per Share Basic Earnings Per Share (“EPS”) is calculated by dividing net income by the weighted average number of common shares outstanding. The computation of diluted EPS assumes the issuance of common shares for all dilutive potential common shares outstanding during the reporting period. The dilutive effect of stock options is considered in earnings per share calculations, if dilutive, using the treasury stock method.
Goodwill and Identified Intangible Assets	Goodwill and Identified Intangible Assets Goodwill represents the excess of costs over fair value of assets of businesses acquired. Goodwill is tested for impairment at least annually or on an interim basis if an event triggering impairment may have occurred. As of October 1, 2023, after completing goodwill testing, we have determined that no goodwill impairment exists. Identified intangible assets are acquired assets that lack physical substance but can be distinguished from goodwill because of contractual or other legal rights or because the asset is capable of being sold or exchanged either on its own or in combination with a related contract, asset, or liability. Our identified intangible assets relate to core deposits and contract rights. As of December 31, 2023, we have determined that no impairment of identified intangibles exists. Identified intangible assets with definite useful lives are amortized on an accelerated basis over their estimated life. See Note 6—Goodwill and Other Intangible Assets.
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets Long-lived assets, such as property, plant, and equipment, and purchased intangibles subject to amortization, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying value of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying value of the asset to the estimated undiscounted future cash flows expected to be generated by the asset. If the carrying value of an asset exceeds its estimated future cash flows, an impairment charge is recognized by the amount by which the carrying value of the asset exceeds the fair value of the asset. Assets to be disposed of would be separately presented in the statement of condition and reported at the lower of the carrying value or fair value less costs to sell and are no longer depreciated. The assets and liabilities of a disposed group classified as held for sale would be presented separately in the appropriate asset and liability sections of the statement of condition.
Consolidated Statements of Cash Flows	Consolidated Statements of Cash Flows For purposes of the consolidated statements of cash flows, we consider all short-term investments with a maturity at date of purchase of three months or less to be cash equivalents. Also, we report transactions related to deposits and loans to customers on a net basis.
Accounting for Transfers and Servicing of Financial Assets	Accounting for Transfers and Servicing of Financial Assets We account for transfers and servicing of financial assets and extinguishments of liabilities based on the application of a financial-components approach that focuses on control. After a transfer of financial assets, we recognize the financial and servicing assets we control and liabilities we have incurred, derecognize financial assets when control has been surrendered and derecognize liabilities when extinguished. We have retained mortgage servicing rights in connection with the sale of mortgage loans. Because we may not initially identify loans as originated for resale, all loans are initially treated as held for investment. The value of the mortgage servicing rights are reviewed periodically for impairment and are amortized in proportion to, and over the period of estimated net servicing income or net servicing losses. The value of the mortgage servicing rights is not significant to the consolidated statements of condition.
Segments of an Enterprise and Related Information	Segments of an Enterprise and Related Information We operate as one segment. The operating information used by our chief executive officer for purposes of assessing performance and making operating decisions is the consolidated financial statements presented in this report. We have five active operating subsidiaries, namely, the Subsidiary Banks. We apply the provisions of ASC Topic 280, “Segment Reporting,” in determining our reportable segments and related disclosures.
Comprehensive Income (Loss)	Comprehensive Income (Loss) Comprehensive income (loss) consists of net income and other comprehensive income (loss). Other comprehensive income (loss) includes unrealized gains and losses on securities available for sale.
Advertising	Advertising Advertising costs are expensed as incurred.
Reclassifications	Reclassifications Certain amounts in the prior year’s presentations have been reclassified to conform to the current presentation. These reclassifications had no effect on previously reported net income or shareholders’ equity.
New Accounting Standards	New Accounting Standards In December 2019, the FASB issued Accounting Standards Update No. 2019-12, to ASC 740, “Income Taxes.” The update amends existing guidance with the intention of simplifying the accounting for income taxes. Specifically, the update removes some exceptions in existing guidance around intraperiod tax allocations, recognition of deferred tax liabilities for certain changes in investments in foreign subsidiaries and to the general methodology for calculating taxes on interim periods when year to date losses exceed the anticipated loss for the year. Additionally, the update clarifies and provides more guidance with respect to the classification of franchise or similar taxes, requirements to evaluate when a step up in the tax basis of goodwill should be considered, eliminates the requirement that a consolidated entity allocate a portion of current and deferred tax expense to a legal entity that is not subject to tax, requires that an entity reflect the effect of changes in tax laws and tax rates in the effective tax rate computed in the interim period that includes the enactment date and makes minor changes for taxes related to employee stock ownership plans and investments in qualified affordable housing projects accounted for using the equity method. The update is effective for fiscal years beginning after December 15, 2020. The adoption of the update did not have a significant impact on our consolidated financial statements. investments in leases. We adopted the provisions of ASU 2022-02 on January 1, 2023 and it did not have a significant impact on our consolidated financial statements.

Investment Securities, Equity_2

Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments (Tables)	12 Months Ended
	Dec. 31, 2023
Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments
Amortized cost and estimated fair value by type of investment security	The amortized cost and estimated fair value by type of investment security at December 31, 2023 are as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Held to Maturity ​ ​ ​ ​ ​ ​ Gross ​ Gross ​ ​ ​ ​ ​ ​ ​ ​ ​ Amortized ​ unrealized ​ unrealized ​ Estimated ​ Carrying ​ ​ ​ cost ​ gains ​ losses ​ fair value ​ value ​ ​ ​ (Dollars in Thousands) ​ Other securities $ 3,400 $ — $ — $ 3,400 $ 3,400 ​ Total investment securities ​ $ 3,400 ​ $ — ​ $ — ​ $ 3,400 ​ $ 3,400 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Available for Sale Debt Securities ​ ​ ​ ​ ​ ​ Gross ​ Gross ​ ​ ​ ​ ​ ​ ​ ​ ​ Amortized ​ unrealized ​ unrealized ​ Estimated ​ Carrying ​ ​ ​ cost ​ gains ​ losses ​ fair value ​ value (1) ​ ​ ​ (Dollars in Thousands) ​ Residential mortgage-backed securities ​ $ 5,169,813 ​ $ 9,541 ​ $ (519,255) ​ $ 4,660,099 ​ $ 4,660,099 ​ Obligations of states and political subdivisions ​ 161,001 ​ 1,602 ​ (361) ​ 162,242 ​ 162,242 ​ Total investment securities ​ $ 5,330,814 ​ $ 11,143 ​ $ (519,616) ​ $ 4,822,341 ​ $ 4,822,341 ​ (1) Included in the carrying value of residential mortgage- backed securities are $959,421 of mortgage-backed securities issued by Ginnie Mae and $3,700,678 of mortgage-backed securities issued by Fannie Mae and Freddie Mac The amortized cost and estimated fair value by type of investment security at December 31, 2022 are as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Held to Maturity ​ ​ ​ ​ ​ ​ Gross ​ Gross ​ ​ ​ ​ ​ ​ ​ ​ ​ Amortized ​ unrealized ​ unrealized ​ Estimated ​ Carrying ​ ​ ​ cost ​ gains ​ losses ​ fair value ​ value ​ ​ ​ (Dollars in Thousands) ​ Other securities $ 3,400 $ — $ — $ 3,400 $ 3,400 ​ Total investment securities ​ $ 3,400 ​ $ — ​ $ — ​ $ 3,400 ​ $ 3,400 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Available for Sale ​ ​ ​ ​ ​ ​ Gross ​ Gross ​ Estimated ​ ​ ​ ​ ​ ​ Amortized ​ unrealized ​ unrealized ​ fair ​ Carrying ​ ​ ​ cost ​ gains ​ losses ​ value ​ value (1) ​ ​ ​ (Dollars in Thousands) ​ U.S. Treasury securities ​ $ 49,752 ​ $ — $ (359) ​ $ 49,393 ​ $ 49,393 ​ Residential mortgage-backed securities ​ 4,805,735 ​ 3,145 ​ ​ (599,668) ​ 4,209,212 ​ 4,209,212 ​ Obligations of states and political subdivisions ​ 163,509 ​ 927 ​ (5,245) ​ 159,191 ​ 159,191 ​ Total investment securities ​ $ 5,018,996 ​ $ 4,072 ​ $ (605,272) ​ $ 4,417,796 ​ $ 4,417,796 ​ (1) Included in the carrying value of residential mortgage- backed securities are $681,121 of mortgage-backed securities issued by Ginnie Mae, $3,528,091 of mortgage-backed securities issued by Fannie Mae and Freddie Mac
Amortized cost and fair value of investment securities, by contractual maturity	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Held to Maturity ​ Available for Sale ​ ​ ​ Amortized ​ Estimated ​ Amortized ​ Estimated ​ ​ ​ Cost ​ fair value ​ Cost ​ fair value ​ ​ ​ (Dollars in Thousands) ​ Due in one year or less $ 2,075 $ 2,075 $ — $ — ​ Due after one year through five years ​ 1,325 ​ 1,325 ​ — ​ ​ — ​ Due after five years through ten years ​ — ​ — ​ 440 ​ 440 ​ Due after ten years ​ — ​ — ​ 160,561 ​ 161,802 ​ Residential mortgage-backed securities ​ — ​ — ​ 5,169,813 ​ 4,660,099 ​ Total investment securities ​ $ 3,400 ​ $ 3,400 ​ $ 5,330,814 ​ $ 4,822,341 ​
Gross unrealized losses on investment securities and the related fair value	Gross unrealized losses on investment securities and the fair value of the related securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2023 were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Less than 12 months ​ 12 months or more ​ Total ​ ​ ​ ​ ​ ​ Unrealized ​ ​ ​ ​ Unrealized ​ ​ ​ ​ Unrealized ​ ​ ​ Fair Value ​ Losses ​ Fair Value ​ Losses ​ Fair Value ​ Losses ​ ​ ​ (Dollars in Thousands) ​ Available for sale: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential mortgage-backed securities $ 577,448 $ (8,267) $ 3,456,349 $ (510,988) $ 4,033,797 $ (519,255) ​ Obligations of states and political subdivisions ​ 651 ​ (1) ​ 64,373 ​ (360) ​ 65,024 ​ (361) ​ ​ ​ $ 578,099 ​ $ (8,268) ​ $ 3,520,722 ​ $ (511,348) ​ $ 4,098,821 ​ $ (519,616) ​ ​ Gross unrealized losses on investment securities and the fair value of the related securities, aggregated by investment category and length of time that individual securities have been in a continuous loss position, at December 31, 2022 were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Less than 12 months ​ 12 months or more ​ Total ​ ​ ​ ​ ​ Unrealized ​ ​ ​ ​ Unrealized ​ ​ ​ ​ Unrealized ​ ​ Fair Value ​ Losses ​ Fair Value ​ Losses ​ Fair Value ​ Losses ​ ​ (Dollars in Thousands) Available for sale: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. Treasury securities ​ $ 49,394 ​ $ (359) ​ $ — ​ $ — ​ $ 49,394 ​ $ (359) Residential mortgage-backed securities ​ 1,357,905 ​ (87,815) ​ 2,566,975 ​ (511,853) ​ 3,924,880 ​ (599,668) Obligations of states and political subdivisions ​ 118,772 ​ (5,245) ​ — ​ — ​ 118,772 ​ (5,245) ​ ​ $ 1,526,071 ​ $ (93,419) ​ $ 2,566,975 ​ $ (511,853) ​ $ 4,093,046 ​ $ (605,272) ​
Summary of unrealized and realized gains and losses recognized in net income on equity securities	​ ​ ​ ​ ​ ​ ​ ​ Year Ended ​ ​ December 31, 2023 ​ ​ (Dollars in Thousands) ​ ​ ​ Net gains recognized during the period on equity securities $ ​ 59 Less: Net gains and (losses) recognized during the period on equity securities sold during the period ​ ​ — ​ ​ ​ ​ ​ Unrealized gains recognized during the reporting period on equity securities still held at the reporting date ​ $ ​ 59 ​ ​ ​ ​ ​ ​ ​ ​ Year Ended ​ ​ December 31, 2022 ​ ​ (Dollars in Thousands) ​ ​ ​ Net losses recognized during the period on equity securities $ ​ (721) Less: Net gains and (losses) recognized during the period on equity securities sold during the period ​ ​ — ​ ​ ​ ​ ​ Unrealized losses recognized during the reporting period on equity securities still held at the reporting date ​ $ ​ (721) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended ​ ​ December 31, 2021 ​ ​ (Dollars in Thousands) ​ ​ ​ Net losses recognized during the period on equity securities $ ​ (123) Less: Net gains and (losses) recognized during the period on equity securities sold during the period ​ ​ — ​ ​ ​ ​ ​ Unrealized losses recognized during the reporting period on equity securities still held at the reporting date ​ $ ​ (123)

Loans (Tables)

Loans (Tables)	12 Months Ended
	Dec. 31, 2023
Loans
Summary of loans, by loan type	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ December 31, ​ ​ ​ 2023 ​ 2022 ​ ​ ​ (Dollars in Thousands) ​ Commercial, financial and agricultural $ 4,802,622 $ 4,373,373 ​ Real estate - mortgage ​ 938,901 ​ 865,994 ​ Real estate - construction ​ 2,091,622 ​ 1,989,669 ​ Consumer ​ 45,121 ​ 41,592 ​ Foreign ​ 180,695 ​ 159,975 ​ Total loans ​ $ 8,058,961 ​ $ 7,430,603 ​ ​

Allowance for Credit Losses (Ta

Allowance for Credit Losses (Tables)	12 Months Ended
	Dec. 31, 2023
Allowance for Credit Losses
Loans individually or collectively evaluated for their impairment and related allowance, by loan class	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 ​ ​ Domestic ​ ​ ​ ​ Foreign ​ ​ ​ ​ ​ ​ ​ ​ Commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ other Commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ construction & real estate: ​ Commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ land ​ farmland & ​ real estate: ​ Residential: ​ Residential: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial ​ development ​ commercial ​ multifamily ​ first lien ​ junior lien ​ Consumer ​ Foreign ​ Total ​ ​ (Dollars in Thousands) ​ Balance at December 31, 2022 $ 26,728 ​ $ 44,684 ​ $ 36,474 ​ $ 3,794 ​ $ 4,759 ​ $ 8,284 ​ $ 281 ​ $ 968 ​ $ 125,972 ​ Losses charged to allowance ​ (9,664) ​ — ​ ​ — ​ — ​ (43) ​ (298) ​ (179) ​ — ​ (10,184) ​ Recoveries credited to allowance ​ 5,433 ​ 837 ​ 143 ​ — ​ 16 ​ 260 ​ 16 ​ — ​ 6,705 ​ Net losses charged to allowance ​ (4,231) ​ 837 ​ 143 ​ — ​ (27) ​ (38) ​ (163) ​ — ​ (3,479) ​ Provision (credit) charged to operations ​ 13,053 ​ ​ 9,770 ​ 6,086 ​ 1,294 ​ 1,080 ​ 2,778 ​ 200 ​ 315 ​ 34,576 ​ Balance at December 31, 2023 ​ $ 35,550 ​ $ 55,291 ​ $ 42,703 ​ $ 5,088 ​ $ 5,812 ​ $ 11,024 ​ $ 318 ​ $ 1,283 ​ $ 157,069 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022 ​ ​ Domestic ​ Foreign ​ ​ ​ ​ ​ ​ ​ ​ Commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ other Commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ construction & real estate: ​ Commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ land ​ farmland & ​ real estate: ​ Residential: ​ Residential: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial development ​ commercial ​ multifamily ​ first lien ​ junior lien ​ Consumer ​ Foreign ​ Total ​ ​ (Dollars in Thousands) ​ Balance at December 31, 2021 $ 23,178 ​ $ 35,390 ​ $ 35,654 ​ $ 3,291 ​ $ 4,073 ​ $ 7,754 ​ $ 272 ​ $ 762 $ 110,374 ​ Losses charged to allowance ​ (9,050) ​ (2) ​ ​ (16) ​ — ​ (160) ​ (28) ​ (223) ​ — ​ (9,479) ​ Recoveries credited to allowance ​ 2,894 ​ 123 ​ 27 ​ — ​ 240 ​ 104 ​ 38 ​ — ​ 3,426 ​ Net losses charged to allowance ​ (6,156) ​ 121 ​ 11 ​ — ​ 80 ​ 76 ​ (185) ​ — ​ (6,053) ​ Provision (credit) charged to operations ​ 9,706 ​ ​ 9,173 ​ 809 ​ 503 ​ 606 ​ 454 ​ 194 ​ 206 ​ 21,651 ​ Balance at December 31, 2022 ​ $ 26,728 ​ $ 44,684 ​ $ 36,474 ​ $ 3,794 ​ $ 4,759 ​ $ 8,284 ​ $ 281 ​ $ 968 ​ $ 125,972 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2021 ​ ​ Domestic ​ Foreign ​ ​ ​ ​ ​ ​ ​ ​ Commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ other Commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ construction & real estate: ​ Commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ land ​ farmland & ​ real estate: ​ Residential: ​ Residential: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial development ​ commercial ​ multifamily ​ first lien ​ junior lien ​ Consumer ​ Foreign ​ Total ​ (Dollars in Thousands) Balance at December 31, 2020 $ 21,908 ​ $ 37,612 ​ $ 30,000 ​ $ 5,051 ​ $ 3,874 ​ $ 9,570 ​ $ 291 ​ $ 753 $ 109,059 ​ Losses charged to allowance ​ (8,083) ​ (2) ​ (364) ​ — ​ (373) ​ (25) ​ (176) ​ (1) ​ (9,024) ​ Recoveries credited to allowance ​ 1,943 ​ — ​ 171 ​ — ​ 60 ​ 164 ​ 46 ​ — ​ 2,384 ​ Net losses charged to allowance ​ (6,140) ​ (2) ​ (193) ​ — ​ (313) ​ 139 ​ (130) ​ (1) ​ (6,640) ​ Provision (credit) charged to operations ​ 7,410 ​ ​ (2,220) ​ 5,847 ​ (1,760) ​ 512 ​ (1,955) ​ 111 ​ 10 ​ 7,955 ​ Balance at December 31, 2021 ​ $ 23,178 ​ $ 35,390 ​ $ 35,654 ​ $ 3,291 ​ $ 4,073 ​ $ 7,754 ​ $ 272 ​ $ 762 ​ $ 110,374 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 ​ ​ ​ Loans Individually ​ Loans Collectively ​ ​ ​ Evaluated For ​ Evaluated For ​ ​ ​ Impairment ​ Impairment ​ ​ ​ Recorded ​ ​ ​ ​ Recorded ​ ​ ​ ​ ​ ​ Investment ​ Allowance ​ Investment ​ Allowance ​ ​ ​ (Dollars in Thousands) ​ Domestic ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial $ 30,872 $ 7,971 $ 1,597,358 $ 27,579 ​ Commercial real estate: other construction & land development ​ 15,701 ​ 4,320 ​ 2,075,921 ​ 50,971 ​ Commercial real estate: farmland & commercial ​ 299 ​ — ​ 2,793,254 ​ 42,703 ​ Commercial real estate: multifamily ​ 96 ​ — ​ 380,743 ​ 5,088 ​ Residential: first lien ​ 93 ​ — ​ 477,940 ​ 5,812 ​ Residential: junior lien ​ — ​ — ​ 460,868 ​ 11,024 ​ Consumer ​ — ​ — ​ 45,121 ​ 318 ​ Foreign ​ — ​ — ​ 180,695 ​ 1,283 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 47,061 ​ $ 12,291 ​ $ 8,011,900 ​ $ 144,778 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022 ​ ​ ​ Loans Individually ​ Loans Collectively ​ ​ ​ Evaluated For ​ Evaluated For ​ ​ ​ Impairment ​ Impairment ​ ​ ​ Recorded ​ ​ ​ ​ Recorded ​ ​ ​ ​ ​ ​ Investment ​ Allowance ​ Investment ​ Allowance ​ ​ ​ (Dollars in Thousands) ​ Domestic ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial $ 30,747 $ 2,375 $ 1,468,006 $ 24,353 ​ Commercial real estate: other construction & land development ​ 20,483 ​ 70 ​ 1,969,186 ​ 44,614 ​ Commercial real estate: farmland & commercial ​ 94 ​ — ​ 2,568,025 ​ 36,474 ​ Commercial real estate: multifamily ​ 117 ​ — ​ 306,384 ​ 3,794 ​ Residential: first lien ​ 77 ​ — ​ 425,647 ​ 4,759 ​ Residential: junior lien ​ 312 ​ — ​ 439,958 ​ 8,284 ​ Consumer ​ — ​ — ​ 41,592 ​ 281 ​ Foreign ​ — ​ — ​ 159,975 ​ 968 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 51,830 ​ $ 2,445 ​ $ 7,378,773 ​ $ 123,527 ​
Loans accounted on non-accrual basis, by loan class	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 ​ December 31, 2022 ​ ​ ​ (Dollars in Thousands) ​ Domestic ​ ​ ​ ​ ​ ​ ​ Commercial $ 30,872 $ 30,747 ​ Commercial real estate: other construction & land development ​ 15,701 ​ 20,483 ​ Commercial real estate: farmland & commercial ​ 299 ​ 94 ​ Commercial real estate: multifamily ​ 96 ​ 117 ​ Residential: first lien ​ 202 ​ 207 ​ Total non-accrual loans ​ $ 47,170 ​ $ 51,648 ​
Loans accounted for as trouble debt restructuring, by loan class	​ ​ ​ ​ ​ ​ ​ December 31, 2022 ​ ​ ​ (Dollars in Thousands) ​ Domestic ​ ​ ​ ​ Residential: first lien ​ $ 1,642 ​ Residential: junior lien ​ ​ 714 ​ Consumer ​ ​ 802 ​ Foreign ​ ​ 55 ​ Total troubled debt restructuring ​ $ 3,213 ​
Information regarding the aging of past due loans, by loan class	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 90 Days or ​ Total ​ ​ ​ ​ ​ ​ ​ ​ ​ 30 - 59 ​ 60 - 89 ​ 90 Days or ​ greater & ​ Past ​ ​ ​ ​ Total ​ ​ ​ Days ​ Days ​ Greater ​ still accruing ​ Due ​ Current ​ Portfolio ​ ​ ​ (Dollars in Thousands) ​ Domestic ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial $ 2,387 $ 1,583 $ 30,238 $ 539 $ 34,208 $ 1,594,022 $ 1,628,230 ​ Commercial real estate: other construction & land development ​ 3,460 ​ — ​ 10,245 ​ — ​ 13,705 ​ 2,077,917 ​ 2,091,622 ​ Commercial real estate: farmland & commercial ​ 1,424 ​ 371 ​ 93 ​ 4 ​ 1,888 ​ 2,791,665 ​ 2,793,553 ​ Commercial real estate: multifamily ​ 369 ​ 330 ​ — ​ — ​ 699 ​ 380,140 ​ 380,839 ​ Residential: first lien ​ 1,812 ​ 1,439 ​ 2,545 ​ 2,437 ​ 5,796 ​ 472,236 ​ 478,032 ​ Residential: junior lien ​ 1,273 ​ 613 ​ 1,701 ​ 1,701 ​ 3,587 ​ 457,282 ​ 460,869 ​ Consumer ​ 263 ​ 11 ​ 27 ​ 27 ​ 301 ​ 44,820 ​ 45,121 ​ Foreign ​ 1,884 ​ 848 ​ 889 ​ 889 ​ 3,621 ​ 177,074 ​ 180,695 ​ Total past due loans ​ $ 12,872 ​ $ 5,195 ​ $ 45,738 ​ $ 5,597 ​ $ 63,805 ​ $ 7,995,156 ​ $ 8,058,961 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 90 Days or ​ Total ​ ​ ​ ​ ​ ​ ​ ​ ​ 30 - 59 ​ 60 - 89 ​ 90 Days or ​ greater & ​ Past ​ ​ ​ ​ Total ​ ​ ​ Days ​ Days ​ Greater ​ still accruing ​ Due ​ Current ​ Portfolio ​ ​ ​ (Dollars in Thousands) ​ Domestic ​ ​ ​ ​ ​ ​ ​ ​ Commercial ​ $ 1,732 $ 258 $ 1,014 $ 59 $ 3,004 $ 1,495,750 $ 1,498,754 ​ Commercial real estate: other construction & land development ​ 1,130 ​ — ​ — ​ — ​ 1,130 ​ 1,988,539 ​ 1,989,669 ​ Commercial real estate: farmland & commercial ​ 1,744 ​ 117 ​ — ​ — ​ 1,861 ​ 2,566,257 ​ 2,568,118 ​ Commercial real estate: multifamily ​ — ​ — ​ — ​ — ​ — ​ 306,501 ​ 306,501 ​ Residential: first lien ​ 2,023 ​ 1,068 ​ 4,189 ​ 4,061 ​ 7,280 ​ 418,444 ​ 425,724 ​ Residential: junior lien ​ 925 ​ 771 ​ 1,717 ​ 1,717 ​ 3,413 ​ 436,857 ​ 440,270 ​ Consumer ​ 281 ​ 14 ​ 7 ​ 7 ​ 302 ​ 41,290 ​ 41,592 ​ Foreign ​ 717 ​ 23 ​ 288 ​ 288 ​ 1,028 ​ 158,947 ​ 159,975 ​ Total past due loans ​ $ 8,552 ​ $ 2,251 ​ $ 7,215 ​ $ 6,132 ​ $ 18,018 ​ $ 7,412,585 ​ $ 7,430,603 ​
Summary of the loan portfolio by credit quality indicator, by loan class	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 2021 2020 2019 Prior Total ​ ​ ​ (Dollars in Thousands) ​ Balance at December 31, 2023 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Domestic ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 791,233 ​ $ 272,919 ​ $ 364,271 ​ $ 50,602 ​ $ 21,468 ​ $ 74,119 ​ $ 1,574,612 ​ Special Review ​ ​ 7,613 ​ ​ 1,800 ​ ​ 164 ​ ​ — ​ ​ — ​ ​ — ​ ​ 9,577 ​ Watch List - Pass ​ ​ 11,865 ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 11,865 ​ Watch List - Substandard ​ ​ 1,180 ​ ​ 92 ​ ​ 28 ​ ​ — ​ ​ — ​ ​ 4 ​ ​ 1,304 ​ Watch List - Doubtful ​ ​ 27 ​ ​ 30,810 ​ ​ 35 ​ ​ — ​ ​ — ​ ​ — ​ ​ 30,872 ​ Total Commercial ​ $ 811,918 ​ $ 305,621 ​ $ 364,498 ​ $ 50,602 ​ $ 21,468 ​ $ 74,123 ​ $ 1,628,230 ​ Commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Current-period gross writeoffs ​ $ 7,053 ​ $ 2,187 ​ $ 155 ​ $ 264 ​ $ 2 ​ $ 3 ​ $ 9,664 ​ Commercial real estate: other construction & land development ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 938,739 ​ $ 674,037 ​ $ 324,238 ​ $ 96,400 ​ $ 14,058 ​ $ 3,219 ​ $ 2,050,691 ​ Watch List - Substandard ​ ​ 25,230 ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 25,230 ​ Watch List - Doubtful ​ ​ 2,726 ​ ​ 12,975 ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 15,701 ​ Total Commercial real estate: other construction & land development ​ $ 966,695 ​ $ 687,012 ​ $ 324,238 ​ $ 96,400 ​ $ 14,058 ​ $ 3,219 ​ $ 2,091,622 ​ Commercial real estate: other construction & land development ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate: farmland & commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 888,878 ​ $ 628,653 ​ $ 415,458 ​ $ 267,705 ​ $ 184,164 ​ $ 248,626 ​ $ 2,633,484 ​ Special Review ​ ​ 5,205 ​ ​ — ​ ​ 3,357 ​ ​ — ​ ​ — ​ ​ — ​ ​ 8,562 ​ Watch List - Pass ​ ​ 16,654 ​ ​ 87 ​ ​ 233 ​ ​ — ​ ​ — ​ ​ — ​ ​ 16,974 ​ Watch List - Substandard ​ ​ 129,644 ​ ​ 2,201 ​ ​ — ​ ​ 2,304 ​ ​ 84 ​ ​ 1 ​ ​ 134,234 ​ Watch List - Doubtful ​ ​ 211 ​ ​ 88 ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 299 ​ Total Commercial real estate: farmland & commercial ​ $ 1,040,592 ​ $ 631,029 ​ $ 419,048 ​ $ 270,009 ​ $ 184,248 ​ $ 248,627 ​ $ 2,793,553 ​ Commercial real estate: farmland & commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate: multifamily ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 123,523 ​ $ 94,551 ​ $ 42,081 ​ $ 73,652 ​ $ 10,743 ​ $ 36,193 ​ $ 380,743 ​ Watch List - Doubtful ​ ​ — ​ ​ 96 ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 96 ​ Total Commercial real estate: multifamily ​ $ 123,523 ​ $ 94,647 ​ $ 42,081 ​ $ 73,652 ​ $ 10,743 ​ $ 36,193 ​ $ 380,839 ​ Commercial real estate: multifamily ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential: first lien ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 180,127 ​ $ 83,568 ​ $ 68,082 ​ $ 39,935 ​ $ 27,499 ​ $ 78,306 ​ $ 477,517 ​ Watch List - Substandard ​ ​ — ​ ​ — ​ ​ 327 ​ ​ — ​ ​ — ​ ​ 95 ​ ​ 422 ​ Watch List - Doubtful ​ ​ — ​ ​ 93 ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 93 ​ Total Residential: first lien ​ $ 180,127 ​ $ 83,661 ​ $ 68,409 ​ $ 39,935 ​ $ 27,499 ​ $ 78,401 ​ $ 478,032 ​ Residential: first lien ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Current-period gross writeoffs ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ 43 ​ $ 43 ​ Residential: junior lien ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 88,628 ​ $ 76,845 ​ $ 96,411 ​ $ 76,490 ​ $ 34,870 ​ $ 87,625 ​ $ 460,869 ​ Total Residential: junior lien ​ $ 88,628 ​ $ 76,845 ​ $ 96,411 ​ $ 76,490 ​ $ 34,870 ​ $ 87,625 ​ $ 460,869 ​ Residential: junior lien ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Current-period gross writeoffs ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ 298 ​ $ 298 ​ Consumer ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 36,639 ​ $ 5,366 ​ $ 1,043 ​ $ 237 ​ $ 157 ​ $ 1,679 ​ $ 45,121 ​ Total Consumer ​ $ 36,639 ​ $ 5,366 ​ $ 1,043 ​ $ 237 ​ $ 157 ​ $ 1,679 ​ $ 45,121 ​ Consumer ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Current-period gross writeoffs ​ $ 54 ​ $ 115 ​ $ 9 ​ $ — ​ $ 1 ​ $ — ​ $ 179 ​ Foreign ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 116,104 ​ $ 43,842 ​ $ 12,317 ​ $ 2,016 ​ $ 2,797 ​ $ 3,619 ​ $ 180,695 ​ Total Foreign ​ $ 116,104 ​ $ 43,842 ​ $ 12,317 ​ $ 2,016 ​ $ 2,797 ​ $ 3,619 ​ $ 180,695 ​ Total Loans ​ $ 3,364,226 ​ $ 1,928,023 ​ $ 1,328,045 ​ $ 609,341 ​ $ 295,840 ​ $ 533,486 ​ $ 8,058,961 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2022 2021 2020 2019 2018 Prior Total ​ ​ (Dollars in Thousands) Balance at December 31, 2022 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Domestic ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 736,462 ​ $ 524,879 ​ $ 96,401 ​ $ 35,917 ​ $ 43,792 ​ $ 29,464 ​ $ 1,466,915 Special Review ​ ​ 377 ​ ​ 213 ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 590 Watch List - Substandard ​ ​ 161 ​ ​ 149 ​ ​ 143 ​ ​ — ​ ​ 49 ​ ​ — ​ ​ 502 Watch List - Doubtful ​ ​ 29,789 ​ ​ — ​ ​ 954 ​ ​ — ​ ​ — ​ ​ 4 ​ ​ 30,747 Total Commercial ​ $ 766,789 ​ $ 525,241 ​ $ 97,498 ​ $ 35,917 ​ $ 43,841 ​ $ 29,468 ​ $ 1,498,754 Commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate: other construction & land development ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 913,675 ​ $ 666,347 ​ $ 173,824 ​ $ 174,897 ​ $ 35,069 ​ $ 5,165 ​ $ 1,968,977 Special Review ​ ​ — ​ ​ — ​ ​ — ​ ​ 209 ​ ​ — ​ ​ — ​ ​ 209 Watch List - Doubtful ​ ​ 19,982 ​ ​ 407 ​ ​ 94 ​ ​ — ​ ​ — ​ ​ — ​ ​ 20,483 Total Commercial real estate: other construction & land development ​ $ 933,657 ​ $ 666,754 ​ $ 173,918 ​ $ 175,106 ​ $ 35,069 ​ $ 5,165 ​ $ 1,989,669 Commercial real estate: farmland & commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 811,117 ​ $ 584,134 ​ $ 456,200 ​ $ 232,537 ​ $ 325,214 ​ $ 81,295 ​ $ 2,490,497 Special Review ​ ​ 2,855 ​ ​ — ​ ​ 842 ​ ​ — ​ ​ — ​ ​ — ​ ​ 3,697 Watch List - Pass ​ ​ 17,060 ​ ​ 247 ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 17,307 Watch List - Substandard ​ ​ 2,275 ​ ​ — ​ ​ 54,152 ​ ​ 96 ​ ​ — ​ ​ — ​ ​ 56,523 Watch List - Doubtful ​ ​ 94 ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 94 Total Commercial real estate: farmland & commercial ​ $ 833,401 ​ $ 584,381 ​ $ 511,194 ​ $ 232,633 ​ $ 325,214 ​ $ 81,295 ​ $ 2,568,118 Commercial real estate: multifamily ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 127,680 ​ $ 87,469 ​ $ 59,035 ​ $ 12,026 ​ $ 5,490 ​ $ 14,684 ​ $ 306,384 Watch List - Doubtful ​ ​ 117 ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 117 Total Commercial real estate: multifamily ​ $ 127,797 ​ $ 87,469 ​ $ 59,035 ​ $ 12,026 ​ $ 5,490 ​ $ 14,684 ​ $ 306,501 Residential: first lien ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 138,771 ​ $ 82,466 ​ $ 49,591 ​ $ 40,985 ​ $ 33,814 ​ $ 79,660 ​ $ 425,287 Watch List - Substandard ​ ​ — ​ ​ 360 ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 360 Watch List - Doubtful ​ ​ 77 ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 77 Total Residential: first lien ​ $ 138,848 ​ $ 82,826 ​ $ 49,591 ​ $ 40,985 ​ $ 33,814 ​ $ 79,660 ​ $ 425,724 Residential: junior lien ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 92,256 ​ $ 108,815 ​ $ 91,130 ​ $ 41,273 ​ $ 21,975 ​ $ 84,509 ​ $ 439,958 Watch List- Doubtful ​ ​ — ​ ​ 312 ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 312 Total Residential: junior lien ​ $ 92,256 ​ $ 109,127 ​ $ 91,130 ​ $ 41,273 ​ $ 21,975 ​ $ 84,509 ​ $ 440,270 Consumer ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 31,962 ​ $ 6,603 ​ $ 897 ​ $ 489 ​ $ 28 ​ $ 1,613 ​ $ 41,592 Total Consumer ​ $ 31,962 ​ $ 6,603 ​ $ 897 ​ $ 489 ​ $ 28 ​ $ 1,613 ​ $ 41,592 Foreign ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 124,265 ​ $ 19,082 ​ $ 5,362 ​ $ 4,848 ​ $ 3,417 ​ $ 3,001 ​ $ 159,975 Total Foreign ​ $ 124,265 ​ $ 19,082 ​ $ 5,362 ​ $ 4,848 ​ $ 3,417 ​ $ 3,001 ​ $ 159,975 Total Loans ​ $ 3,048,975 ​ $ 2,081,483 ​ $ 988,625 ​ $ 543,277 ​ $ 468,848 ​ $ 299,395 ​ $ 7,430,603

Bank Premises and Equipment (Ta

Bank Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2023
Bank Premises and Equipment
Summary of bank premises and equipment, by asset classification	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Estimated ​ ​ ​ ​ ​ ​ ​ ​ useful lives ​ 2023 ​ 2022 ​ ​ ​ ​ ​ ​ ​ (Dollars in Thousands) Bank buildings and improvements 5 - 39 years $ 582,075 $ 571,665 ​ Furniture, equipment and vehicles 1 - 20 years ​ 325,855 ​ 307,990 ​ Land ​ ​ ​ ​ ​ ​ 108,551 ​ 108,622 ​ Less: accumulated depreciation ​ ​ ​ ​ ​ ​ (579,387) ​ (556,665) ​ Bank premises and equipment, net ​ ​ ​ ​ ​ ​ $ 437,094 ​ $ 431,612 ​ ​

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2023
Goodwill and Other Intangible Assets
Schedule of the entity's identified intangible assets	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Carrying ​ Accumulated ​ ​ ​ ​ ​ Amount ​ Amortization ​ Net ​ ​ (Dollars in Thousands) December 31, 2023: ​ ​ ​ ​ Core deposit premium ​ $ 58,675 ​ $ 58,675 ​ $ — ​ Identified intangible (contract rights) ​ 2,022 ​ 2,022 ​ — ​ Total identified intangibles ​ $ 60,697 ​ $ 60,697 ​ $ — ​ December 31, 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Core deposit premium ​ $ 58,675 ​ $ 58,675 ​ $ — ​ Identified intangible (contract rights) ​ 2,022 ​ 2,022 ​ — ​ Total identified intangibles ​ $ 60,697 ​ $ 60,697 ​ $ — ​

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2023
Deposits.
Schedule of deposits and related interest expense	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 ​ 2022 ​ ​ (Dollars in Thousands) Deposits: ​ ​ ​ Demand - non-interest bearing ​ ​ ​ ​ ​ ​ ​ Domestic ​ $ 4,126,635 ​ $ 4,744,299 ​ Foreign ​ 904,210 ​ 1,101,756 ​ Total demand non-interest bearing ​ 5,030,845 ​ 5,846,055 ​ Savings and interest bearing demand ​ ​ ​ ​ ​ ​ ​ Domestic ​ 3,161,411 ​ 3,448,717 ​ Foreign ​ 1,207,121 ​ 1,297,051 ​ Total savings and interest bearing demand ​ 4,368,532 ​ 4,745,768 ​ Time, certificates of deposit $100,000 or more ​ ​ ​ ​ ​ ​ ​ Domestic ​ 763,419 ​ 652,073 ​ Foreign ​ 1,103,710 ​ 892,619 ​ Less than $100,000 ​ ​ ​ ​ ​ ​ ​ Domestic ​ 289,565 ​ 276,660 ​ Foreign ​ 268,483 ​ 246,832 ​ Total time, certificates of deposit ​ 2,425,177 ​ 2,068,184 ​ Total deposits ​ $ 11,824,554 ​ $ 12,660,007 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 ​ 2022 ​ 2021 ​ ​ (Dollars in Thousands) Interest expense: ​ ​ ​ ​ Savings and interest bearing demand ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Domestic $ 42,148 ​ $ 9,196 ​ $ 3,268 ​ Foreign ​ 18,189 ​ 3,490 ​ 842 ​ Total savings and interest bearing demand ​ 60,337 ​ 12,686 ​ 4,110 ​ Time, certificates of deposit $100,000 or more ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Domestic ​ 18,597 ​ 5,528 ​ 6,652 ​ Foreign ​ 25,471 ​ 3,867 ​ 3,452 ​ Less than $100,000 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Domestic ​ 4,592 ​ 1,027 ​ 984 ​ Foreign ​ 4,498 ​ 735 ​ 567 ​ Total time, certificates of deposit ​ 53,158 ​ 11,157 ​ 11,655 ​ Total interest expense on deposits ​ $ 113,495 ​ $ 23,843 ​ $ 15,765 ​ ​
Scheduled maturities of time deposits	Scheduled maturities of time deposits as of December 31, 2023 were as follows: ​ ​ ​ ​ ​ ​ ​ Total ​ ​ (in thousands) 2024 ​ $ 2,301,914 ​ 2025 ​ 85,385 ​ 2026 ​ 23,102 ​ 2027 ​ 14,200 ​ 2028 ​ 573 ​ Thereafter ​ 3 ​ Total ​ $ 2,425,177 ​
Scheduled maturities of time deposits in amounts of $100,000 or more	​ ​ ​ ​ ​ ​ ​ Total ​ ​ (in thousands) Due within 3 months or less $ 859,734 Due after 3 months and within 6 months ​ 517,994 Due after 6 months and within 12 months ​ 409,193 Due after 12 months ​ 80,208 ​ ​ $ 1,867,129

Securities Sold Under Repurch_2

Securities Sold Under Repurchase Agreements (Tables)	12 Months Ended
	Dec. 31, 2023
Securities Sold Under Repurchase Agreements
Schedule of repurchase agreements	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Collateral Securities ​ Repurchase Borrowing ​ ​ Book Value of ​ Fair Value of ​ Balance of ​ Weighted Average ​ ​ Securities Sold ​ Securities Sold ​ Liability ​ Interest Rate ​ ​ (Dollars in Thousands) December 31, 2023 term: ​ ​ ​ ​ Overnight agreements ​ $ 667,647 ​ $ 587,673 ​ $ 518,650 3.76 % 1 to 29 days ​ 24,842 ​ 20,454 ​ 10,696 4.50 ​ 30 to 90 days ​ — ​ — ​ — — ​ Over 90 days ​ 1,623 ​ 1,574 ​ 1,070 4.00 ​ Total ​ $ 694,112 ​ $ 609,701 ​ $ 530,416 3.78 % December 31, 2022 term: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Overnight agreements ​ $ 664,491 ​ $ 559,637 ​ $ 419,703 1.61 % 1 to 29 days ​ — ​ — ​ — — ​ 30 to 90 days ​ — ​ — ​ — — ​ Over 90 days ​ 20,852 ​ 16,968 ​ 11,488 1.32 ​ Total ​ $ 685,343 ​ $ 576,605 ​ $ 431,191 1.60 %

Other Borrowed Funds (Tables)

Other Borrowed Funds (Tables)	12 Months Ended
	Dec. 31, 2023
Other Borrowed Funds
Schedule of other borrowed funds	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ ​ 2023 ​ 2022 ​ ​ (Dollars in Thousands) Federal Home Loan Bank advances—long-term(1) ​ ​ ​ ​ ​ ​ ​ Balance at year end ​ $ 10,745 ​ $ 10,944 ​ Rate on balance outstanding at year end ​ 2.61 % 2.61 % Average daily balance ​ $ 10,837 ​ $ 386,924 ​ Average rate ​ 2.61 % 1.75 % Maximum amount outstanding at any month end ​ $ 10,928 ​ $ 436,122 ​ (1) Long-term advances at December 31, 2023 and December 31, 2022 consisted of amortizing and non-amortizing advances. The non-amortizing advances totaling $425,000,000 were called by the Federal Home Loan bank in the fourth quarter of 2022. Two amortizing advances are outstanding at December 31, 2023 in the amounts of $2,914,000 and $7,831,000 and mature in December 2033 and November 2033, respectively. The amortization on the amortizing long-term advances totals approximately $204,000 , $210,000 , $215,000 , $221,000 and $227,000 for the years ending December 31, 2024, 2025, 2026, 2027 and December 31, 2028, respectively .

Junior Subordinated Interest _2

Junior Subordinated Interest Deferrable Debentures (Tables)	12 Months Ended
	Dec. 31, 2023
Junior Subordinated Interest Deferrable Debentures
Junior subordinated interest deferrable debentures, major types of business trusts	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Junior ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Subordinated ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Deferrable ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest ​ Repricing ​ Interest ​ Interest ​ ​ ​ Optional ​ ​ ​ Debentures ​ Frequency ​ Rate ​ Rate Index (1) ​ Maturity Date ​ Redemption Date (2) ​ ​ ​ (Dollars in Thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Trust IX ​ $ 41,238 Quarterly 7.28 % SOFR + 1.62 October 2036 October 2011 ​ Trust X ​ 21,021 Quarterly 7.29 % SOFR + 1.65 February 2037 February 2012 ​ Trust XI ​ 25,990 Quarterly 7.28 % SOFR + 1.62 July 2037 July 2012 ​ Trust XII ​ 20,619 Quarterly 7.09 % SOFR + 1.45 September 2037 September 2012 ​ ​ ​ $ 108,868 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (1) On July 1, 2023, the interest rate index on the Capital and Common Securities transitioned from U.S.-dollar London Interbank Offered Rate (“LIBOR”) to the Three-Month CME Term Secured Overnight Financing rate (“SOFR”) with a 26-basis point spread adjustment. (2) The Capital Securities may be redeemed in whole or in part on any interest payment date after the Optional Redemption Date.

Earnings per Share ("EPS") (Tab

Earnings per Share ("EPS") (Tables)	12 Months Ended
	Dec. 31, 2023
Earnings per Share ("EPS")
Schedule of calculation of the basic EPS and the diluted EPS	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net Income ​ Shares ​ Per Share ​ ​ (Numerator) ​ (Denominator) ​ Amount ​ ​ (Dollars in Thousands, ​ ​ Except Per Share Amounts) December 31, 2023: ​ ​ ​ Basic EPS ​ ​ ​ ​ ​ ​ ​ ​ ​ Net income available to common shareholders ​ $ 411,768 62,082,827 ​ $ 6.63 ​ Potential dilutive common shares ​ — 138,774 ​ ​ ​ ​ Diluted EPS ​ $ 411,768 62,221,601 ​ $ 6.62 ​ December 31, 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ Basic EPS ​ ​ ​ ​ ​ ​ ​ ​ ​ Net income available to common shareholders ​ $ 300,232 62,658,414 ​ $ 4.79 ​ Potential dilutive common shares ​ — 151,820 ​ ​ ​ ​ Diluted EPS ​ $ 300,232 62,810,234 ​ $ 4.78 ​ December 31, 2021: ​ ​ ​ ​ ​ ​ ​ ​ ​ Basic EPS ​ ​ ​ ​ ​ ​ ​ ​ ​ Net income available to common shareholders ​ $ 253,922 63,352,737 ​ $ 4.01 ​ Potential dilutive common shares ​ — 133,629 ​ ​ ​ ​ Diluted EPS ​ $ 253,922 63,486,366 ​ $ 4.00 ​ ​

International Operations (Table

International Operations (Tables)	12 Months Ended
	Dec. 31, 2023
International Operations
Summary of assets attributable to international operations	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 ​ 2022 ​ ​ (Dollars in Thousands) Loans: ​ ​ ​ Commercial ​ $ 106,241 ​ $ 103,748 ​ Others ​ 74,454 ​ 56,227 ​ ​ ​ 180,695 ​ 159,975 ​ Less allowance for probable loan losses ​ (1,283) ​ (968) ​ Net loans ​ $ 179,412 ​ $ 159,007 ​ Accrued interest receivable ​ $ 876 ​ $ 515 ​

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2023
Income Taxes
Schedule of current and deferred portions of net income tax expense	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 ​ 2022 ​ 2021 ​ ​ (Dollars in Thousands) Current ​ ​ ​ ​ U.S. ​ $ 82,657 ​ $ 66,670 ​ $ 59,591 ​ State ​ 6,137 ​ 5,118 ​ 5,272 ​ Total current taxes ​ 88,794 ​ 71,788 ​ 64,863 ​ Deferred ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. ​ 23,001 ​ 10,555 ​ 3,794 ​ State ​ (51) ​ 64 ​ (252) ​ Total deferred taxes ​ 22,950 ​ 10,619 ​ 3,542 ​ Total income taxes ​ $ 111,744 ​ $ 82,407 ​ $ 68,405 ​
Schedule of income tax expense differences from the amount computed by applying the U.S. Federal income tax rate to income before income taxes	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 ​ 2022 ​ 2021 ​ ​ (Dollars in Thousands) Computed expected tax expense $ 110,065 $ 80,893 $ 68,011 ​ Change in taxes resulting from: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Tax-exempt interest income ​ (3,663) ​ (2,433) ​ (2,970) ​ State tax, net of federal income taxes, tax credit and refunds ​ 4,808 ​ 4,094 ​ 3,966 ​ Other investment income ​ (2,761) ​ (1,391) ​ (1,753) ​ Net investment in low income housing investments ​ ​ 1,974 ​ ​ 1,906 ​ ​ 203 ​ Other ​ 1,321 ​ (662) ​ 948 ​ Actual tax expense ​ $ 111,744 ​ $ 82,407 ​ $ 68,405 ​
Schedule of tax effects of temporary difference that give rise to significant portions of the deferred tax assets and deferred tax liabilities	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 ​ 2022 ​ ​ (Dollars in Thousands) Deferred tax assets: ​ ​ ​ Loans receivable, principally due to the allowance for probable loan losses ​ $ 32,136 ​ $ 25,982 ​ Other real estate owned ​ 1,649 ​ 1,194 ​ Accrued expenses ​ 581 ​ 186 ​ Net unrealized losses on available for sale investment securities ​ ​ 110,584 ​ ​ 130,586 ​ Other ​ 1,352 ​ 2,308 ​ Total deferred tax assets ​ 146,302 ​ 160,256 ​ Deferred tax liabilities: ​ ​ ​ ​ ​ ​ ​ Bank premises and equipment, principally due to differences on depreciation ​ (14,879) ​ (13,615) ​ Impairment charges on available-for-sale securities ​ ​ (19) ​ ​ (19) ​ Identified intangible assets and goodwill ​ (14,151) ​ (14,125) ​ Partnership investment pass through ​ ​ (58,376) ​ ​ (30,319) ​ Other ​ (3,321) ​ (3,555) ​ Total deferred tax liabilities ​ (90,746) ​ (61,633) ​ Net deferred tax asset ​ $ 55,556 ​ $ 98,623 ​

Stock Options and Stock Appre_2

Stock Options and Stock Appreciation Rights (Tables)	12 Months Ended
	Dec. 31, 2023
Stock Options and Stock Appreciation Rights
Schedule of Black-Scholes-Merton option valuation model assumptions	​ ​ ​ ​ ​ ​ 2022 Expected Life (Years) 7.00 ​ Dividend yield 3.08 % Interest rate 1.94 % Volatility 37.78 %
Summary of option activity under stock option plans	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted ​ ​ ​ ​ ​ ​ Weighted ​ average ​ ​ ​ ​ ​ ​ ​ ​ average ​ remaining ​ Aggregate ​ ​ ​ Number of ​ exercise ​ contractual ​ intrinsic ​ ​ ​ options ​ price ​ term (years) ​ value ($) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (in Thousands) ​ Options outstanding at December 31, 2022 461,822 ​ $ 29.67 ​ ​ ​ ​ ​ ​ Plus: Options granted — ​ — ​ ​ ​ ​ ​ ​ Less: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Options exercised (46,444) ​ 25.12 ​ ​ ​ ​ ​ ​ Options expired — ​ — ​ ​ ​ ​ ​ ​ Options forfeited (31,513) ​ 24.52 ​ ​ ​ ​ ​ ​ Options outstanding at December 31, 2023 383,865 ​ 30.65 3.42 ​ $ 9,088 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Options fully vested and exercisable at December 31, 2023 232,143 ​ $ 27.80 1.96 ​ $ 6,157 ​
Summary of activity under the SAR Plan	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted ​ ​ ​ ​ ​ Weighted ​ average ​ ​ ​ ​ ​ Number of ​ average ​ remaining ​ Aggregate ​ ​ stock appreciation ​ exercise ​ contractual ​ intrinsic ​ ​ rights ​ price ​ term (years) ​ value ($) ​ ​ ​ ​ ​ ​ ​ ​ ​ (in Thousands) Stock appreciation rights outstanding at December 31, 2022 489,250 ​ $ 39.35 ​ ​ ​ ​ ​ Plus: Stock appreciation rights granted ​ ​ ​ ​ ​ ​ ​ ​ ​ Less: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Stock appreciation rights exercised — ​ ​ — ​ ​ ​ ​ ​ Stock appreciation rights expired — ​ ​ — ​ ​ ​ ​ ​ Stock appreciation rights forfeited (24,000) ​ ​ 39.33 ​ ​ ​ ​ ​ Stock appreciation rights outstanding at December 31, 2023 465,250 ​ 39.35 8.50 ​ ​ 6,964 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Stock appreciation rights fully vested and exercisable at December 31, 2023 — ​ $ — ​ ​ ​ ​
Schedule of other information pertaining to option activity	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Twelve Months Ended December 31, ​ ​ 2023 ​ 2022 ​ 2021 Weighted average grant date fair value of stock options granted $ — $ 11.24 $ 10.20 ​ Total fair value of stock options vested ​ $ 514,000 ​ $ 514,000 ​ $ 1,308,000 ​ Total intrinsic value of stock options exercised ​ $ 1,060,000 ​ $ 1,670,000 ​ $ 2,536,000 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Financial Instruments with Of_2

Financial Instruments with Off-Statement of Condition Risk and Concentrations of Credit Risk (Tables)	12 Months Ended
	Dec. 31, 2023
Financial Instruments with Off-Statement of Condition Risk and Concentrations of Credit Risk
Schedule of financial amounts of instruments, whose contract amounts represent credit risks	​ ​ ​ ​ ​ Commitments to extend credit $ 3,340,280 Credit card lines ​ $ 14,181 Standby letters of credit ​ $ 147,190 Commercial letters of credit ​ $ 361

Capital Requirements (Tables)

Capital Requirements (Tables)	12 Months Ended
	Dec. 31, 2023
Capital Ratios
Schedule of the Company's and the bank subsidiaries' actual capital amounts and ratios	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For Capital Adequacy ​ To Be Well-Capitalized ​ ​ ​ ​ ​ ​ ​ Purposes ​ Under Prompt Corrective ​ ​ Actual ​ Phase In Schedule ​ Action Provisions ​ ​ Amount ​ Ratio ​ Amount ​ Ratio ​ Amount ​ Ratio ​ ​ ​ ​ ​ ​ ​ (greater than ​ (greater than ​ (greater than ​ (greater than ​ ​ ​ ​ ​ ​ ​ or equal to) ​ or equal to) ​ or equal to) ​ or equal to) ​ ​ (Dollars in Thousands) As of December 31, 2023: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Common Equity Tier 1 (to Risk Weighted Assets): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ $ 2,563,130 21.72 % $ 825,968 7.000 % ​ N/A N/A ​ International Bank of Commerce, Laredo ​ 1,444,775 18.54 ​ 545,611 7.000 ​ $ 506,639 6.50 % International Bank of Commerce, Brownsville ​ ​ 477,390 ​ 24.41 ​ ​ 136,883 ​ 7.000 ​ ​ 127,106 ​ 6.50 ​ International Bank of Commerce, Oklahoma ​ 232,965 20.72 ​ 78,718 7.000 ​ 73,095 6.50 ​ Commerce Bank ​ 97,334 36.57 ​ 18,628 7.000 ​ 17,298 6.50 ​ International Bank of Commerce, Zapata ​ 64,110 31.18 ​ 14,394 7.000 ​ 13,366 6.50 ​ Total Capital (to Risk Weighted Assets): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ $ 2,790,171 23.65 % $ 1,238,952 10.500 % ​ N/A N/A ​ International Bank of Commerce, Laredo ​ 1,542,462 19.79 ​ 818,416 10.500 ​ $ 779,444 10.00 % International Bank of Commerce, Brownsville ​ ​ 500,268 ​ 25.58 ​ ​ 205,325 ​ 10.500 ​ ​ 195,547 ​ 10.00 ​ International Bank of Commerce, Oklahoma ​ 247,031 21.97 ​ 118,076 10.500 ​ 112,454 10.00 ​ Commerce Bank ​ 100,660 37.82 ​ 27,943 10.500 ​ 26,612 10.00 ​ International Bank of Commerce, Zapata ​ 66,680 32.43 ​ 21,591 10.500 ​ 20,563 10.00 ​ Tier 1 Capital (to Risk Weighted Assets): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ $ 2,642,492 22.39 % $ 1,002,961 8.500 % N/A N/A ​ International Bank of Commerce, Laredo ​ 1,444,775 18.54 ​ 662,527 8.500 ​ $ 623,555 8.00 % International Bank of Commerce, Brownsville ​ ​ 477,390 ​ 24.41 ​ ​ 166,215 ​ 8.500 ​ ​ 156,438 ​ 8.00 ​ International Bank of Commerce, Oklahoma ​ 232,965 20.72 ​ 95,586 8.500 ​ 89,963 8.00 ​ Commerce Bank ​ 97,334 36.57 ​ 22,620 8.500 ​ 21,290 8.00 ​ International Bank of Commerce, Zapata ​ 64,110 31.18 ​ 17,478 8.500 ​ 16,450 8.00 ​ Tier 1 Capital (to Average Assets): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ $ 2,642,492 17.46 % $ 605,262 4.00 % $ N/A N/A ​ International Bank of Commerce, Laredo ​ 1,444,775 16.40 ​ 352,412 4.00 ​ 440,515 5.00 % International Bank of Commerce, Brownsville ​ ​ 477,390 ​ 11.79 ​ ​ 161,919 ​ 4.00 ​ ​ 202,398 ​ 5.00 ​ International Bank of Commerce, Oklahoma ​ 232,965 14.72 ​ 63,294 4.00 ​ 79,117 5.00 ​ Commerce Bank ​ 97,334 14.50 ​ 26,858 4.00 ​ 33,572 5.00 ​ International Bank of Commerce, Zapata ​ 64,110 13.26 ​ 19,338 4.00 ​ 24,172 5.00 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ To Be Well-Capitalized ​ ​ ​ ​ ​ ​ ​ For Capital Adequacy ​ ​ Under Prompt Corrective ​ ​ Actual ​ Purposes ​ ​ Action Provisions ​ ​ Amount ​ Ratio ​ Amount ​ Ratio ​ ​ Amount Ratio ​ ​ ​ ​ ​ ​ ​ (greater than ​ (greater than ​ (greater than ​ (greater than ​ ​ ​ ​ ​ ​ ​ or equal to) ​ or equal to) ​ or equal to) ​ or equal to) ​ ​ (Dollars in Thousands) As of December 31, 2022: ​ ​ ​ ​ Common Equity Tier 1 (to Risk Weighted Assets): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ $ 2,232,723 ​ 20.21 % $ 773,398 7.000 % ​ N/A N/A ​ International Bank of Commerce, Laredo ​ 1,310,616 ​ 18.07 ​ 507,625 7.000 ​ $ 471,366 6.50 % International Bank of Commerce, Oklahoma ​ ​ 363,093 ​ 20.86 ​ ​ 121,855 ​ 7.000 ​ ​ 113,151 ​ 6.50 ​ International Bank of Commerce, Brownsville ​ 232,689 ​ 21.17 ​ 76,941 7.000 ​ 71,445 6.50 ​ International Bank of Commerce, Zapata ​ 98,087 ​ 42.26 ​ 16,248 7.000 ​ 15,088 6.50 ​ Commerce Bank ​ 71,418 ​ 37.70 ​ 13,261 7.000 ​ 12,314 6.50 ​ Total Capital (to Risk Weighted Assets): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ $ 2,455,468 ​ 22.22 % $ 1,160,096 10.500 % ​ N/A N/A % International Bank of Commerce, Laredo ​ 1,401,298 ​ 19.32 ​ 761,438 10.500 ​ $ 725,179 10.00 ​ International Bank of Commerce, Oklahoma ​ ​ 383,804 ​ 22.05 ​ ​ 182,782 ​ 10.500 ​ ​ 174,078 ​ 10.00 ​ International Bank of Commerce, Brownsville ​ 243,739 ​ 22.18 ​ 115,412 10.500 ​ 109,916 10.00 ​ International Bank of Commerce, Zapata ​ 100,798 ​ 43.43 ​ 24,372 10.500 ​ 23,212 10.00 ​ Commerce Bank ​ 73,420 ​ 38.76 ​ 19,892 10.500 ​ 18,945 10.00 ​ Tier 1 Capital (to Risk Weighted Assets): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ % Consolidated ​ $ 2,324,903 ​ 21.04 % $ 939,126 8.500 % N/A N/A ​ International Bank of Commerce, Laredo ​ 1,310,616 ​ 18.07 ​ 616,402 8.500 ​ $ 580,143 8.00 ​ International Bank of Commerce, Oklahoma ​ ​ 363,093 ​ 20.86 ​ ​ 147,966 ​ 8.500 ​ ​ 139,262 ​ 8.00 ​ International Bank of Commerce, Brownsville ​ 232,689 ​ 21.17 ​ 93,429 8.500 ​ 87,933 8.00 ​ International Bank of Commerce, Zapata ​ 98,087 ​ 42.26 ​ 19,730 8.500 ​ 18,569 8.00 ​ Commerce Bank ​ 71,418 ​ 37.70 ​ 16,103 8.500 ​ 15,156 8.00 % Tier 1 Capital (to Average Assets): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ $ 2,324,903 ​ 14.59 % $ 637,578 4.00 % $ N/A N/A ​ International Bank of Commerce, Laredo ​ 1,310,616 ​ 13.09 ​ 400,489 4.00 ​ 500,611 5.00 ​ International Bank of Commerce, Oklahoma ​ ​ 363,093 ​ 8.95 ​ ​ 162,246 ​ 4.00 ​ ​ 202,808 ​ 5.00 ​ International Bank of Commerce, Brownsville ​ 232,689 ​ 13.48 ​ 69,028 4.00 ​ 86,286 5.00 ​ International Bank of Commerce, Zapata ​ 98,087 ​ 14.39 ​ 27,270 4.00 ​ 34,088 5.00 ​ Commerce Bank ​ 71,418 ​ 15.00 ​ 19,048 4.00 ​ 23,811 5.00 ​

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2023
Fair Value Measurements
Assets and liabilities measured at fair value on a recurring basis	The following table represents financial instruments reported on the consolidated statements of condition at their fair value as of December 31, 2023 by level within the fair value measurement hierarchy. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair Value Measurements at ​ ​ ​ ​ ​ ​ Reporting Date Using ​ ​ ​ ​ ​ ​ (in Thousands) ​ ​ ​ ​ ​ ​ Quoted ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Prices in ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Active ​ Significant ​ ​ ​ ​ ​ ​ Assets/Liabilities ​ Markets for ​ Other ​ Significant ​ ​ ​ Measured at ​ Identical ​ Observable ​ Unobservable ​ ​ ​ Fair Value ​ Assets ​ Inputs ​ Inputs ​ ​ ​ December 31, 2023 ​ (Level 1) ​ (Level 2) ​ (Level 3) ​ Measured on a recurring basis: ​ ​ ​ ​ ​ Assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Available for sale debt securities ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential mortgage-backed securities ​ $ 4,660,099 ​ $ — ​ $ 4,660,099 ​ $ — ​ States and political subdivisions ​ 162,242 ​ — ​ 162,242 ​ — ​ Equity Securities ​ 5,417 ​ 5,417 ​ ​ — ​ — ​ ​ ​ $ 4,827,758 ​ $ 5,417 ​ $ 4,822,341 ​ $ — ​ ​ The following table represents financial instruments reported on the consolidated balance sheets at their fair value as of December 31, 2022 by level within the fair value measurement hierarchy. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair Value Measurements at ​ ​ ​ ​ ​ ​ Reporting Date Using ​ ​ ​ ​ ​ ​ (in Thousands) ​ ​ ​ ​ ​ ​ Quoted ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Prices in ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Active ​ Significant ​ ​ ​ ​ ​ ​ Assets/Liabilities ​ Markets for ​ Other ​ Significant ​ ​ ​ Measured at ​ Identical ​ Observable ​ Unobservable ​ ​ ​ Fair Value ​ Assets ​ Inputs ​ Inputs ​ ​ ​ December 31, 2022 ​ (Level 1) ​ (Level 2) ​ (Level 3) ​ Measured on a recurring basis: ​ ​ ​ ​ ​ Assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Available for sale securities ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. Treasury securities ​ $ 49,393 ​ $ — ​ $ 49,393 ​ $ — ​ Residential mortgage-backed securities ​ ​ 4,209,212 ​ ​ — ​ ​ 4,209,212 ​ ​ — ​ States and political subdivisions ​ 159,191 ​ — ​ 159,191 ​ — ​ Equity Securities ​ 5,358 ​ 5,358 ​ — ​ — ​ ​ ​ $ 4,423,154 ​ $ 5,358 ​ $ 4,417,796 ​ $ — ​
Assets measured at fair value on a non-recurring basis	The following table represents financial instruments measured at fair value on a non-recurring basis as of and for the period ended December 31, 2023 by level within the fair value measurement hierarchy: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair Value Measurements at Reporting ​ ​ ​ ​ ​ ​ ​ ​ Date Using ​ ​ ​ ​ ​ ​ ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ Quoted ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Assets/Liabilities ​ Prices in ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Measured at ​ Active ​ Significant ​ ​ ​ ​ ​ ​ ​ ​ Fair Value ​ Markets for ​ Other ​ Significant ​ Net ​ ​ Period ended ​ Identical ​ Observable ​ Unobservable ​ Provision ​ ​ December 31, ​ Assets ​ Inputs ​ Inputs ​ During ​ ​ 2023 ​ (Level 1) ​ (Level 2) ​ (Level 3) ​ Period Measured on a non-recurring basis: ​ ​ ​ ​ ​ Assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Watch-List doubtful loans ​ $ 46,124 ​ $ — ​ $ — ​ $ 46,124 ​ $ 10,221 Other real estate owned ​ ​ 307 ​ ​ — ​ ​ — ​ ​ 307 ​ ​ 2,538 ​ The following table represents financial instruments measured at fair value on a non-recurring basis as of and for the year ended December 31, 2022 by level within the fair value measurement hierarchy: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair Value Measurements at Reporting ​ ​ ​ ​ ​ ​ ​ ​ Date Using ​ ​ ​ ​ ​ ​ ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ Quoted ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Assets/Liabilities ​ Prices in ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Measured at ​ Active ​ Significant ​ ​ ​ ​ ​ ​ ​ ​ Fair Value ​ Markets ​ Other ​ Significant ​ Net ​ ​ Year ended ​ for Identical ​ Observable ​ Unobservable ​ Provision ​ ​ December 31, ​ Assets ​ Inputs ​ Inputs ​ During ​ ​ 2022 ​ (Level 1) ​ (Level 2) ​ (Level 3) ​ Period Measured on a non-recurring basis: ​ ​ ​ ​ ​ Assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Watch-List doubtful loans ​ $ 30,743 ​ $ — ​ $ — ​ $ 30,743 ​ $ 2,346 Other real estate owned ​ 5,653 ​ — ​ — ​ 5,653 ​ 1,627

International Bancshares Corp_4

International Bancshares Corporation (Parent Company Only) Financial Information Statements of Condition (Tables)	12 Months Ended
	Dec. 31, 2023
International Bancshares Corporation (Parent Company Only) Financial Information Statements of Condition
Schedule of condensed statements of condition of Parent Company	(Dollars in Thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 ASSETS ​ ​ ​ ​ ​ ​ ​ Cash ​ $ 105,184 ​ $ 89,263 ​ Other investments ​ 111,382 ​ 114,901 ​ Net loans ​ 62,150 ​ 42,519 ​ Investment in subsidiaries ​ 2,281,952 ​ 1,933,269 ​ Goodwill ​ ​ 3,365 ​ ​ 3,365 ​ Other assets ​ 8,617 ​ 7,181 ​ Total assets ​ $ 2,572,650 ​ $ 2,190,498 ​ LIABILITIES AND SHAREHOLDERS’ EQUITY ​ ​ ​ ​ ​ ​ ​ Liabilities: ​ ​ ​ ​ ​ ​ ​ Junior subordinated deferrable interest debentures ​ $ 108,868 ​ $ 134,642 ​ Due to IBC Trading ​ 21 ​ 21 ​ Other liabilities ​ 15,987 ​ 11,076 ​ Total liabilities ​ 124,876 ​ 145,739 ​ Shareholders’ equity: ​ ​ ​ ​ ​ ​ ​ Common shares ​ 96,467 ​ 96,420 ​ Surplus ​ 155,511 ​ 154,061 ​ Retained earnings ​ 3,029,088 ​ 2,695,567 ​ Accumulated other comprehensive loss ​ (397,889) ​ (470,497) ​ ​ ​ 2,883,177 ​ 2,475,551 ​ Less cost of shares in treasury ​ (435,403) ​ (430,792) ​ Total shareholders’ equity ​ 2,447,774 ​ 2,044,759 ​ Total liabilities and shareholders’ equity ​ $ 2,572,650 ​ $ 2,190,498 ​ ​

International Bancshares Corp_5

International Bancshares Corporation (Parent Company Only) Financial Information Statements of Income (Tables)	12 Months Ended
	Dec. 31, 2023
International Bancshares Corporation (Parent Company Only) Financial Information Statements of Income
Schedule of condensed statements of income of Parent Company	(Dollars in Thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 2021 Income: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Dividends from subsidiaries ​ $ 179,000 ​ $ 222,175 ​ $ 80,882 ​ Interest income on notes receivable ​ 5,769 ​ 2,394 ​ 1,139 ​ (Loss) income on other investments ​ (6,150) ​ 8,662 ​ 9,662 ​ Other ​ 4 ​ 857 ​ 58 ​ Total income ​ 178,623 ​ 234,088 ​ 91,741 ​ Expenses: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest expense (Debentures) ​ 8,122 ​ 5,037 ​ 2,792 ​ Provision for credit loss ​ ​ 500 ​ ​ 437 ​ ​ — ​ Other ​ 252 ​ 2,291 ​ 2,272 ​ Total expenses ​ 8,874 ​ 7,765 ​ 5,064 ​ Income before federal income taxes and equity in undistributed net income of subsidiaries ​ 169,749 ​ 226,323 ​ 86,677 ​ Income tax (benefit) expense ​ (1,365) ​ 504 ​ 1,358 ​ Income before equity in undistributed net income of subsidiaries ​ 171,114 ​ 225,819 ​ 85,319 ​ Equity in undistributed net income of subsidiaries ​ 240,654 ​ 74,413 ​ 168,603 ​ Net income ​ $ 411,768 ​ $ 300,232 ​ $ 253,922 ​ ​

International Bancshares Corp_6

International Bancshares Corporation (Parent Company Only) Financial Information Statements of Cash Flows (Tables)	12 Months Ended
	Dec. 31, 2023
International Bancshares Corporation (Parent Company Only) Financial Information Statements of Cash Flows
Schedule of condensed statements of cash flows of Parent Company	(Dollars in Thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 2021 Operating activities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net income ​ $ 411,768 ​ $ 300,232 ​ $ 253,922 ​ Adjustments to reconcile net income to net cash provided by operating activities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Provision for credit loss ​ ​ 500 ​ ​ 437 ​ ​ — ​ Unrealized (gain) loss on equity securities with readily determinable fair values ​ ​ (14) ​ ​ 36 ​ ​ (51) ​ Stock compensation expense ​ 330 ​ 449 ​ 506 ​ Increase (decrease) in other liabilities ​ 4,911 ​ 1,743 ​ (8,084) ​ Equity in undistributed net income of subsidiaries ​ (240,654) ​ (74,413) ​ (168,603) ​ Net cash provided by operating activities ​ 176,841 ​ 228,484 ​ 77,690 ​ Investing activities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net (increase) decrease in notes receivable ​ (20,170) ​ (32,556) ​ 1,549 ​ Increase in other assets and other investments ​ (33,285) ​ (43,343) ​ (11,787) ​ Net cash used in investing activities ​ (53,455) ​ (75,899) ​ (10,238) ​ Financing activities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Redemption of long-term debt ​ (25,774) ​ — ​ — ​ Proceeds from stock transactions ​ 1,167 ​ 1,537 ​ 2,414 ​ Payments of cash dividends - common ​ (78,247) ​ (75,375) ​ (72,838) ​ Purchase of treasury stock ​ (4,611) ​ (52,048) ​ (716) ​ Net cash used in financing activities ​ (107,465) ​ (125,886) ​ (71,140) ​ Increase (decrease) in cash ​ 15,921 ​ 26,699 ​ (3,688) ​ Cash at beginning of year ​ 89,263 ​ 62,564 ​ 66,252 ​ Cash at end of year ​ $ 105,184 ​ $ 89,263 ​ $ 62,564 ​ ​

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Details)		12 Months Ended
	Oct. 01, 2021 USD ($)	Dec. 31, 2023 USD ($) item	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Summary of Significant Accounting Policies
Number of insurance-related subsidiaries | item		1
Investment Securities
Number of components in which other-than-temporary impairment is segregated | item		2
Non-Accrual Loans
Period of charge off for past due unsecured consumer loans		90 days
Minimum period that past due unsecured loans outstanding may not be placed on nonaccrual status under special circumstances		90 days
Maximum period of non-consumer loans outstanding that is used to evaluate whether loans should be placed on non-accrual status		90 days
Other Real Estate Owned and Repossessed Assets
Other real estate owned		$ 26,728,000	$ 30,144,000
Repossessed assets		$ 236,000	4,637,000
Income Taxes
Percentage of likelihood of realization of recognized tax benefit		50%
Liability for unrecognized tax benefits		$ 0	0
Interest expense related to uncertain tax positions		0	0	$ 0
Penalties related to uncertain tax positions		0	0	$ 0
Goodwill and Identified Intangible Assets
Goodwill impairment loss	$ 0
Impairment of identified intangible assets		$ 0
Segments of an Enterprise and Related Information
Number of operating segments | item		1
Number of active operating bank subsidiaries | item		5
New Accounting Standards
Retained Earnings (Accumulated Deficit)		$ 3,029,088,000	$ 2,695,567,000

Investment Securities, Equity_3

Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Held-to-maturity securities
Amortized Value	$ 3,400,000	$ 3,400,000
Estimated fair value	3,400,000	3,400,000
Carrying Value	3,400,000	3,400,000
Available-for-sale securities
Amortized cost	5,330,814,000	5,018,996,000
Gross unrealized gains	11,143,000	4,072,000
Gross unrealized losses	(519,616,000)	(605,272,000)
Estimated fair value, Available for sale securities	4,822,341,000	4,417,796,000
Collateral Pledged
Available-for-sale securities
Amortized cost	1,836,634,000
Estimated Fair Value
Available-for-sale securities
Estimated fair value, Available for sale securities	4,822,341,000	4,417,796,000
Reported Value Measurement
Available-for-sale securities
Amortized cost	4,822,341,000	4,417,796,000
US Treasury Securities
Available-for-sale securities
Amortized cost		49,752,000
Gross unrealized losses		(359,000)
US Treasury Securities | Estimated Fair Value
Available-for-sale securities
Estimated fair value, Available for sale securities		49,393,000
US Treasury Securities | Reported Value Measurement
Available-for-sale securities
Amortized cost		49,393,000
Residential mortgage-backed securities
Available-for-sale securities
Amortized cost	5,169,813,000	4,805,735,000
Gross unrealized gains	9,541,000	3,145,000
Gross unrealized losses	(519,255,000)	(599,668,000)
Residential mortgage-backed securities | Estimated Fair Value
Available-for-sale securities
Estimated fair value, Available for sale securities	4,660,099,000	4,209,212,000
Residential mortgage-backed securities | Reported Value Measurement
Available-for-sale securities
Amortized cost	4,660,099,000	4,209,212,000
US Government Corporations and Agencies Securities [Member]
Held-to-maturity securities
Carrying Value	959,421,000
Available-for-sale securities
Amortized cost		681,121
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Held-to-maturity securities
Carrying Value	3,700,678,000
Available-for-sale securities
Amortized cost		3,528,091
States and political subdivisions
Available-for-sale securities
Amortized cost	161,001,000	163,509,000
Gross unrealized gains	1,602,000	927,000
Gross unrealized losses	(361,000)	(5,245,000)
States and political subdivisions | Estimated Fair Value
Available-for-sale securities
Estimated fair value, Available for sale securities	162,242,000	159,191,000
States and political subdivisions | Reported Value Measurement
Available-for-sale securities
Amortized cost	162,242,000	159,191,000
Other Debt Obligations
Held-to-maturity securities
Amortized Value	3,400,000	3,400,000
Estimated fair value	3,400,000	3,400,000
Carrying Value	$ 3,400,000	$ 3,400,000

Investment Securities, Equity_4

Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments (Contractual Maturities and Estimated Fair Values) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Amortized Cost
Due in one year or less, held-to-maturity debt securities amortized cost	$ 2,075,000
Due after one year through five years, held-to-maturity debt securities amortized cost	1,325,000
Amortized cost, held-to-maturity debt securities	3,400,000	$ 3,400,000
Fair Value
Due in one year or less, held-to-maturity debt securities, Estimated fair value	2,075,000
Due after one year through five years, held-to-maturity debt securities, Estimated fair value	1,325,000
Estimated fair value	3,400,000	3,400,000
Available-for-sale debt securities amortized cost disclosures
Due after five years through ten years, available-for-sale debt securities amortized cost	440,000
Due after ten years, available-for-sale debt securities amortized cost	160,561,000
Residential mortgage-backed securities, amortized cost	5,169,813,000
Amortized cost, Available-for-sale securities	5,330,814,000	5,018,996,000
Available for sale debt securities, Estimated Fair Value Disclosures
Due after five years through ten years, available-for-sale debt securities, Estimated Fair Value	440,000
Due after ten years, available-for-sale debt securities, Estimated Fair Value	161,802,000
Residential mortgage-backed securities, Estimated Fair Value	4,660,099,000
Estimated fair value, Available for sale securities	4,822,341,000	4,417,796,000
Available for sale debt securities, Estimated Fair Value Disclosures
Proceeds from sales and calls of available for sale securities	2,045,000	800,000	$ 5,890,000
Proceeds from sales and calls of available for sale securities	2,045,000	800,000	5,890,000
Proceeds from sales of mortgage-backed securities	0	0	0
Gross gains realized on sales	0	0	0
Gross losses realized on sales	3,000	$ 0	$ 16,000
Collateral Pledged
Available-for-sale debt securities amortized cost disclosures
Amortized cost, Available-for-sale securities	1,836,634,000
Available for sale debt securities, Estimated Fair Value Disclosures
Fair value of available for sale investment securities pledged	$ 1,598,853,000

Investment Securities, Equity_5

Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments (Unrealized Losses) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Available for sale:
Fair value, less than 12 months	$ 578,099	$ 1,526,071
Unrealized losses, less than 12 Months	(8,268)	(93,419)
Fair value, 12 months or more	3,520,722	2,566,975
Unrealized losses, 12 Months or More	(511,348)	(511,853)
Fair value, Total	4,098,821	4,093,046
Unrealized losses, Total	(519,616)	(605,272)
US Treasury Securities
Available for sale:
Fair value, less than 12 months		49,394
Unrealized losses, less than 12 Months		(359)
Fair value, Total		49,394
Unrealized losses, Total		(359)
Residential mortgage-backed securities
Available for sale:
Fair value, less than 12 months	577,448	1,357,905
Unrealized losses, less than 12 Months	(8,267)	(87,815)
Fair value, 12 months or more	3,456,349	2,566,975
Unrealized losses, 12 Months or More	(510,988)	(511,853)
Fair value, Total	4,033,797	3,924,880
Unrealized losses, Total	(519,255)	(599,668)
States and political subdivisions
Available for sale:
Fair value, less than 12 months	651	118,772
Unrealized losses, less than 12 Months	(1)	(5,245)
Fair value, 12 months or more	64,373
Unrealized losses, 12 Months or More	(360)
Fair value, Total	65,024	118,772
Unrealized losses, Total	$ (361)	$ (5,245)

Investment Securities, Equity_6

Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments (Unrealized and realized gains and losses recognized in net income on equity securities ) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments
Equity Securities	$ 5,417,000	$ 5,358,000
Summary of unrealized and realized gains and losses recognized in net income on equity securities
Net losses recognized during the period on equity securities	59,000	(721,000)	$ (123,000)
Unrealized gain on equity securities with readily determinable fair values	$ 59,000	$ (721,000)	$ (123,000)

Investment Securities (Other In

Investment Securities (Other Investments) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Other investments
LIHTC
Investments	$ 200,245	$ 214,549
Other liabilities
LIHTC
Unfunded commitments	$ 34,126	$ 41,191

Loans (Details)

Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Summary of loans, by loan type
Total loans	$ 8,058,961	$ 7,430,603
Commercial, financial and agricultural
Summary of loans, by loan type
Total loans	4,802,622	4,373,373
Real estate - mortgage
Summary of loans, by loan type
Total loans	938,901	865,994
Obligations of states and political subdivisions
Summary of loans, by loan type
Total loans	2,091,622	1,989,669
Consumer
Summary of loans, by loan type
Total loans	45,121	41,592
Foreign.
Summary of loans, by loan type
Total loans	$ 180,695	$ 159,975

Allowance for Credit Losses (By

Allowance for Credit Losses (By Loan Class) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Balance at the beginning of the period	$ 125,972	$ 110,374	$ 109,059
Losses charged to allowance	(10,184)	(9,479)	(9,024)
Recoveries credited to allowance	6,705	3,426	2,384
Net losses charged to allowance	(3,479)	(6,053)	(6,640)
Provision (credit) charged to operations	34,576	21,651	7,955
Balance at the end of the period	157,069	125,972	110,374
Commercial, financial and agricultural | Domestic | Commercial.
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Balance at the beginning of the period	26,728	23,178	21,908
Losses charged to allowance	(9,664)	(9,050)	(8,083)
Recoveries credited to allowance	5,433	2,894	1,943
Net losses charged to allowance	(4,231)	(6,156)	(6,140)
Provision (credit) charged to operations	13,053	9,706	7,410
Balance at the end of the period	35,550	26,728	23,178
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Balance at the beginning of the period	36,474	35,654	30,000
Losses charged to allowance		(16)	(364)
Recoveries credited to allowance	143	27	171
Net losses charged to allowance	143	11	(193)
Provision (credit) charged to operations	6,086	809	5,847
Balance at the end of the period	42,703	36,474	35,654
Commercial, financial and agricultural | Domestic | Commercial real estate: multifamily
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Balance at the beginning of the period	3,794	3,291	5,051
Provision (credit) charged to operations	1,294	503	(1,760)
Balance at the end of the period	5,088	3,794	3,291
Obligations of states and political subdivisions | Domestic | Commercial Real Estate: other construction and land development
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Balance at the beginning of the period	44,684	35,390	37,612
Losses charged to allowance		(2)	(2)
Recoveries credited to allowance	837	123
Net losses charged to allowance	837	121	(2)
Provision (credit) charged to operations	9,770	9,173	(2,220)
Balance at the end of the period	55,291	44,684	35,390
Real estate - mortgage | Domestic | Residential: first lien
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Balance at the beginning of the period	4,759	4,073	3,874
Losses charged to allowance	(43)	(160)	(373)
Recoveries credited to allowance	16	240	60
Net losses charged to allowance	(27)	80	(313)
Provision (credit) charged to operations	1,080	606	512
Balance at the end of the period	5,812	4,759	4,073
Real estate - mortgage | Domestic | Residential Junior Lien
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Balance at the beginning of the period	8,284	7,754	9,570
Losses charged to allowance	(298)	(28)	(25)
Recoveries credited to allowance	260	104	164
Net losses charged to allowance	(38)	76	139
Provision (credit) charged to operations	2,778	454	(1,955)
Balance at the end of the period	11,024	8,284	7,754
Consumer | Domestic
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Balance at the beginning of the period	281	272	291
Losses charged to allowance	(179)	(223)	(176)
Recoveries credited to allowance	16	38	46
Net losses charged to allowance	(163)	(185)	(130)
Provision (credit) charged to operations	200	194	111
Balance at the end of the period	318	281	272
Foreign. | Foreign
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Balance at the beginning of the period	968	762	753
Losses charged to allowance			(1)
Net losses charged to allowance			(1)
Provision (credit) charged to operations	315	206	10
Balance at the end of the period	$ 1,283	$ 968	$ 762

Allowance for Credit Losses (Im

Allowance for Credit Losses (Impairment By Loan Class) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans Individually Evaluated for Impairment, Recorded Investment	$ 47,061	$ 51,830
Loans Individually Evaluated for Impairment, Allowance	12,291	2,445
Loans Collectively Evaluated for Impairment, Recorded Investment	8,011,900	7,378,773
Loans Collectively Evaluated for Impairment, Allowance	144,778	123,527
Commercial, financial and agricultural | Domestic | Commercial.
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans Individually Evaluated for Impairment, Recorded Investment	30,872	30,747
Loans Individually Evaluated for Impairment, Allowance	7,971	2,375
Loans Collectively Evaluated for Impairment, Recorded Investment	1,597,358	1,468,006
Loans Collectively Evaluated for Impairment, Allowance	27,579	24,353
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans Individually Evaluated for Impairment, Recorded Investment	299	94
Loans Collectively Evaluated for Impairment, Recorded Investment	2,793,254	2,568,025
Loans Collectively Evaluated for Impairment, Allowance	42,703	36,474
Commercial, financial and agricultural | Domestic | Commercial real estate: multifamily
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans Individually Evaluated for Impairment, Recorded Investment	96	117
Loans Collectively Evaluated for Impairment, Recorded Investment	380,743	306,384
Loans Collectively Evaluated for Impairment, Allowance	5,088	3,794
Obligations of states and political subdivisions | Domestic | Commercial Real Estate: other construction and land development
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans Individually Evaluated for Impairment, Recorded Investment	15,701	20,483
Loans Individually Evaluated for Impairment, Allowance	4,320	70
Loans Collectively Evaluated for Impairment, Recorded Investment	2,075,921	1,969,186
Loans Collectively Evaluated for Impairment, Allowance	50,971	44,614
Real estate - mortgage | Domestic | Residential: first lien
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans Individually Evaluated for Impairment, Recorded Investment	93	77
Loans Collectively Evaluated for Impairment, Recorded Investment	477,940	425,647
Loans Collectively Evaluated for Impairment, Allowance	5,812	4,759
Real estate - mortgage | Domestic | Residential Junior Lien
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans Individually Evaluated for Impairment, Recorded Investment		312
Loans Collectively Evaluated for Impairment, Recorded Investment	460,868	439,958
Loans Collectively Evaluated for Impairment, Allowance	11,024	8,284
Consumer | Domestic
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans Collectively Evaluated for Impairment, Recorded Investment	45,121	41,592
Loans Collectively Evaluated for Impairment, Allowance	318	281
Foreign. | Foreign
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans Collectively Evaluated for Impairment, Recorded Investment	180,695	159,975
Loans Collectively Evaluated for Impairment, Allowance	$ 1,283	$ 968

Allowance for Credit Losses (No

Allowance for Credit Losses (Non-accrual Basis By Loan Class) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Loan loss allowances, financing receivable past due
Non-accrual loans, total	$ 47,170,000	$ 51,648,000	$ 1,921,000
Reduced interest income on non-accrual loans	6,614,000	116,000	$ 169,000
Commercial, financial and agricultural | Domestic | Commercial.
Loan loss allowances, financing receivable past due
Non-accrual loans, total	30,872,000	30,747,000
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial
Loan loss allowances, financing receivable past due
Non-accrual loans, total	299,000	94,000
Commercial, financial and agricultural | Domestic | Commercial real estate: multifamily
Loan loss allowances, financing receivable past due
Non-accrual loans, total	96,000	117,000
Obligations of states and political subdivisions | Domestic | Commercial Real Estate: other construction and land development
Loan loss allowances, financing receivable past due
Non-accrual loans, total	15,701,000	20,483,000
Real estate - mortgage | Domestic | Residential: first lien
Loan loss allowances, financing receivable past due
Non-accrual loans, total	$ 202,000	$ 207,000

Allowance for Credit Losses (_2

Allowance for Credit Losses (Impaired Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Loan loss allowances
Total troubled debt restructuring		$ 3,213
Period of charge off for past due unsecured commercial loans	90 days
Domestic | Residential: first lien
Loan loss allowances
Total troubled debt restructuring		1,642
Domestic | Residential Junior Lien
Loan loss allowances
Total troubled debt restructuring		714
Consumer | Domestic
Loan loss allowances
Total troubled debt restructuring		802
Foreign. | Foreign
Loan loss allowances
Total troubled debt restructuring		$ 55

Allowance for Credit Losses (Ag

Allowance for Credit Losses (Aging By Loan Class) (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing receivable recorded investment
Past due 90 days or Greater and Still Accruing	$ 5,597,000	$ 6,132,000	$ 8,642,000
Loans	8,058,961,000	7,430,603,000
Current
Financing receivable recorded investment
Loans	7,995,156,000	7,412,585,000
Total Past Due
Financing receivable recorded investment
Loans	63,805,000	18,018,000
30 to 59 Days
Financing receivable recorded investment
Loans	12,872,000	8,552,000
60 to 89 Days
Financing receivable recorded investment
Loans	5,195,000	2,251,000
90 Days or Greater
Financing receivable recorded investment
Loans	45,738,000	7,215,000
Commercial, financial and agricultural
Financing receivable recorded investment
Loans	4,802,622,000	4,373,373,000
Commercial, financial and agricultural | Domestic | Commercial.
Financing receivable recorded investment
Past due 90 days or Greater and Still Accruing	539,000	59,000
Loans	1,628,230,000	1,498,754,000
Commercial, financial and agricultural | Domestic | Commercial. | Current
Financing receivable recorded investment
Loans	1,594,022,000	1,495,750,000
Commercial, financial and agricultural | Domestic | Commercial. | Total Past Due
Financing receivable recorded investment
Loans	34,208,000	3,004,000
Commercial, financial and agricultural | Domestic | Commercial. | 30 to 59 Days
Financing receivable recorded investment
Loans	2,387,000	1,732,000
Commercial, financial and agricultural | Domestic | Commercial. | 60 to 89 Days
Financing receivable recorded investment
Loans	1,583,000	258,000
Commercial, financial and agricultural | Domestic | Commercial. | 90 Days or Greater
Financing receivable recorded investment
Loans	30,238,000	1,014,000
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial
Financing receivable recorded investment
Past due 90 days or Greater and Still Accruing	4,000
Loans	2,793,553,000	2,568,118,000
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial | Current
Financing receivable recorded investment
Loans	2,791,665,000	2,566,257,000
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial | Total Past Due
Financing receivable recorded investment
Loans	1,888,000	1,861,000
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial | 30 to 59 Days
Financing receivable recorded investment
Loans	1,424,000	1,744,000
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial | 60 to 89 Days
Financing receivable recorded investment
Loans	371,000	117,000
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial | 90 Days or Greater
Financing receivable recorded investment
Loans	93,000
Commercial, financial and agricultural | Domestic | Commercial real estate: multifamily
Financing receivable recorded investment
Loans	380,839,000	306,501,000
Commercial, financial and agricultural | Domestic | Commercial real estate: multifamily | Current
Financing receivable recorded investment
Loans	380,140,000	306,501,000
Commercial, financial and agricultural | Domestic | Commercial real estate: multifamily | Total Past Due
Financing receivable recorded investment
Loans	699,000
Commercial, financial and agricultural | Domestic | Commercial real estate: multifamily | 30 to 59 Days
Financing receivable recorded investment
Loans	369,000
Commercial, financial and agricultural | Domestic | Commercial real estate: multifamily | 60 to 89 Days
Financing receivable recorded investment
Loans	330,000
Obligations of states and political subdivisions
Financing receivable recorded investment
Loans	2,091,622,000	1,989,669,000
Obligations of states and political subdivisions | Domestic | Commercial Real Estate: other construction and land development
Financing receivable recorded investment
Loans	2,091,622,000	1,989,669,000
Obligations of states and political subdivisions | Domestic | Commercial Real Estate: other construction and land development | Current
Financing receivable recorded investment
Loans	2,077,917,000	1,988,539,000
Obligations of states and political subdivisions | Domestic | Commercial Real Estate: other construction and land development | Total Past Due
Financing receivable recorded investment
Loans	13,705,000	1,130,000
Obligations of states and political subdivisions | Domestic | Commercial Real Estate: other construction and land development | 30 to 59 Days
Financing receivable recorded investment
Loans	3,460,000	1,130,000
Obligations of states and political subdivisions | Domestic | Commercial Real Estate: other construction and land development | 90 Days or Greater
Financing receivable recorded investment
Loans	10,245,000
Real estate - mortgage
Financing receivable recorded investment
Loans	938,901,000	865,994,000
Real estate - mortgage | Domestic | Residential: first lien
Financing receivable recorded investment
Past due 90 days or Greater and Still Accruing	2,437,000	4,061,000
Loans	478,032,000	425,724,000
Real estate - mortgage | Domestic | Residential: first lien | Current
Financing receivable recorded investment
Loans	472,236,000	418,444,000
Real estate - mortgage | Domestic | Residential: first lien | Total Past Due
Financing receivable recorded investment
Loans	5,796,000	7,280,000
Real estate - mortgage | Domestic | Residential: first lien | 30 to 59 Days
Financing receivable recorded investment
Loans	1,812,000	2,023,000
Real estate - mortgage | Domestic | Residential: first lien | 60 to 89 Days
Financing receivable recorded investment
Loans	1,439,000	1,068,000
Real estate - mortgage | Domestic | Residential: first lien | 90 Days or Greater
Financing receivable recorded investment
Loans	2,545,000	4,189,000
Real estate - mortgage | Domestic | Residential Junior Lien
Financing receivable recorded investment
Past due 90 days or Greater and Still Accruing	1,701,000	1,717,000
Loans	460,869,000	440,270,000
Real estate - mortgage | Domestic | Residential Junior Lien | Current
Financing receivable recorded investment
Loans	457,282,000	436,857,000
Real estate - mortgage | Domestic | Residential Junior Lien | Total Past Due
Financing receivable recorded investment
Loans	3,587,000	3,413,000
Real estate - mortgage | Domestic | Residential Junior Lien | 30 to 59 Days
Financing receivable recorded investment
Loans	1,273,000	925,000
Real estate - mortgage | Domestic | Residential Junior Lien | 60 to 89 Days
Financing receivable recorded investment
Loans	613,000	771,000
Real estate - mortgage | Domestic | Residential Junior Lien | 90 Days or Greater
Financing receivable recorded investment
Loans	1,701,000	1,717,000
Consumer
Financing receivable recorded investment
Loans	45,121,000	41,592,000
Consumer | Domestic
Financing receivable recorded investment
Past due 90 days or Greater and Still Accruing	27,000	7,000
Loans	45,121,000	41,592,000
Consumer | Domestic | Current
Financing receivable recorded investment
Loans	44,820,000	41,290,000
Consumer | Domestic | Total Past Due
Financing receivable recorded investment
Loans	301,000	302,000
Consumer | Domestic | 30 to 59 Days
Financing receivable recorded investment
Loans	263,000	281,000
Consumer | Domestic | 60 to 89 Days
Financing receivable recorded investment
Loans	11,000	14,000
Consumer | Domestic | 90 Days or Greater
Financing receivable recorded investment
Loans	27,000	7,000
Foreign.
Financing receivable recorded investment
Loans	180,695,000	159,975,000
Foreign. | Foreign
Financing receivable recorded investment
Past due 90 days or Greater and Still Accruing	889,000	288,000
Loans	180,695,000	159,975,000
Foreign. | Foreign | Current
Financing receivable recorded investment
Loans	177,074,000	158,947,000
Foreign. | Foreign | Total Past Due
Financing receivable recorded investment
Loans	3,621,000	1,028,000
Foreign. | Foreign | 30 to 59 Days
Financing receivable recorded investment
Loans	1,884,000	717,000
Foreign. | Foreign | 60 to 89 Days
Financing receivable recorded investment
Loans	848,000	23,000
Foreign. | Foreign | 90 Days or Greater
Financing receivable recorded investment
Loans	$ 889,000	$ 288,000

Allowance for Credit Losses (Po

Allowance for Credit Losses (Portfolio Credit Quality) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) item	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Loan portfolio by credit quality indicator
2023	$ 3,364,226
2022	1,928,023	$ 3,048,975
2021	1,328,045	2,081,483
2020	609,341	988,625
2019	295,840	543,277
2018/Prior	533,486	468,848
Prior		299,395
Total loans	8,058,961	7,430,603
Current-period gross writeoffs
Total	$ 10,184	9,479	$ 9,024
Commercial Real Estate: other construction and land development
Current-period gross writeoffs
Number of loans downgraded | item	2
Commercial real estate: farmland & commercial
Current-period gross writeoffs
Number of loans downgraded | item	2
Commercial, financial and agricultural
Loan portfolio by credit quality indicator
Total loans	$ 4,802,622	4,373,373
Commercial, financial and agricultural | Domestic | Commercial.
Loan portfolio by credit quality indicator
2023	811,918
2022	305,621	766,789
2021	364,498	525,241
2020	50,602	97,498
2019	21,468	35,917
2018/Prior	74,123	43,841
Prior		29,468
Total loans	1,628,230	1,498,754
Current-period gross writeoffs
Total	9,664	9,050	8,083
Commercial, financial and agricultural | Domestic | Commercial. | Pass
Loan portfolio by credit quality indicator
2023	791,233
2022	272,919	736,462
2021	364,271	524,879
2020	50,602	96,401
2019	21,468	35,917
2018/Prior	74,119	43,792
Prior		29,464
Total loans	1,574,612	1,466,915
Commercial, financial and agricultural | Domestic | Commercial. | Special Review
Loan portfolio by credit quality indicator
2023	7,613
2022	1,800	377
2021	164	213
Total loans	9,577	590
Commercial, financial and agricultural | Domestic | Commercial. | Watch List - Pass
Loan portfolio by credit quality indicator
2023	11,865
Total loans	11,865
Commercial, financial and agricultural | Domestic | Commercial. | Watch List - Substandard
Loan portfolio by credit quality indicator
2023	1,180
2022	92	161
2021	28	149
2020		143
2018/Prior	4	49
Total loans	1,304	502
Commercial, financial and agricultural | Domestic | Commercial. | Watch List - Doubtful
Loan portfolio by credit quality indicator
2023	27
2022	30,810	29,789
2021	35
2020		954
Prior		4
Total loans	30,872	30,747
Commercial, financial and agricultural | Domestic | Commercial. | Current Period Gross Write-Offs
Loan portfolio by credit quality indicator
2023	7,053
2022	2,187
2021	155
2020	264
2019	2
2018/Prior	3
Total loans	9,664
Commercial, financial and agricultural | Domestic | Commercial Real Estate: other construction and land development | Watch List - Substandard
Loan portfolio by credit quality indicator
2023	25,230
Total loans	25,230
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial
Loan portfolio by credit quality indicator
2023	1,040,592
2022	631,029	833,401
2021	419,048	584,381
2020	270,009	511,194
2019	184,248	232,633
2018/Prior	248,627	325,214
Prior		81,295
Total loans	2,793,553	2,568,118
Current-period gross writeoffs
Total		16	364
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial | Pass
Loan portfolio by credit quality indicator
2023	888,878
2022	628,653	811,117
2021	415,458	584,134
2020	267,705	456,200
2019	184,164	232,537
2018/Prior	248,626	325,214
Prior		81,295
Total loans	2,633,484	2,490,497
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial | Special Review
Loan portfolio by credit quality indicator
2023	5,205
2022		2,855
2021	3,357
2020		842
Total loans	8,562	3,697
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial | Watch List - Pass
Loan portfolio by credit quality indicator
2023	16,654
2022	87	17,060
2021	233	247
Total loans	16,974	17,307
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial | Watch List - Substandard
Loan portfolio by credit quality indicator
2023	129,644
2022	2,201	2,275
2020	2,304	54,152
2019	84	96
2018/Prior	1
Total loans	134,234	56,523
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial | Watch List - Doubtful
Loan portfolio by credit quality indicator
2023	211
2022	88	94
Total loans	299	94
Commercial, financial and agricultural | Domestic | Commercial real estate: multifamily
Loan portfolio by credit quality indicator
2023	123,523
2022	94,647	127,797
2021	42,081	87,469
2020	73,652	59,035
2019	10,743	12,026
2018/Prior	36,193	5,490
Prior		14,684
Total loans	380,839	306,501
Commercial, financial and agricultural | Domestic | Commercial real estate: multifamily | Pass
Loan portfolio by credit quality indicator
2023	123,523
2022	94,551	127,680
2021	42,081	87,469
2020	73,652	59,035
2019	10,743	12,026
2018/Prior	36,193	5,490
Prior		14,684
Total loans	380,743	306,384
Commercial, financial and agricultural | Domestic | Commercial real estate: multifamily | Watch List - Doubtful
Loan portfolio by credit quality indicator
2022	96	117
2021
2020
2019
2018/Prior
Prior
Total loans	96	117
Obligations of states and political subdivisions
Loan portfolio by credit quality indicator
Total loans	2,091,622	1,989,669
Obligations of states and political subdivisions | Domestic | Commercial Real Estate: other construction and land development
Loan portfolio by credit quality indicator
2023	966,695
2022	687,012	933,657
2021	324,238	666,754
2020	96,400	173,918
2019	14,058	175,106
2018/Prior	3,219	35,069
Prior		5,165
Total loans	2,091,622	1,989,669
Current-period gross writeoffs
Total		2	2
Obligations of states and political subdivisions | Domestic | Commercial Real Estate: other construction and land development | Pass
Loan portfolio by credit quality indicator
2023	938,739
2022	674,037	913,675
2021	324,238	666,347
2020	96,400	173,824
2019	14,058	174,897
2018/Prior	3,219	35,069
Prior		5,165
Total loans	2,050,691	1,968,977
Obligations of states and political subdivisions | Domestic | Commercial Real Estate: other construction and land development | Special Review
Loan portfolio by credit quality indicator
2022
2021
2020
2019		209
2018/Prior
Prior
Total loans		209
Obligations of states and political subdivisions | Domestic | Commercial Real Estate: other construction and land development | Watch List - Doubtful
Loan portfolio by credit quality indicator
2023	2,726
2022	12,975	19,982
2021		407
2020		94
Total loans	15,701	20,483
Real estate - mortgage
Loan portfolio by credit quality indicator
Total loans	938,901	865,994
Real estate - mortgage | Domestic | Residential: first lien
Loan portfolio by credit quality indicator
2023	180,127
2022	83,661	138,848
2021	68,409	82,826
2020	39,935	49,591
2019	27,499	40,985
2018/Prior	78,401	33,814
Prior		79,660
Total loans	478,032	425,724
Current-period gross writeoffs
Total	43	160	373
Real estate - mortgage | Domestic | Residential: first lien | Pass
Loan portfolio by credit quality indicator
2023	180,127
2022	83,568	138,771
2021	68,082	82,466
2020	39,935	49,591
2019	27,499	40,985
2018/Prior	78,306	33,814
Prior		79,660
Total loans	477,517	425,287
Real estate - mortgage | Domestic | Residential: first lien | Watch List - Substandard
Loan portfolio by credit quality indicator
2021	327	360
2018/Prior	95
Total loans	422	360
Real estate - mortgage | Domestic | Residential: first lien | Watch List - Doubtful
Loan portfolio by credit quality indicator
2022	93	77
Total loans	93	77
Real estate - mortgage | Domestic | Residential: first lien | Current Period Gross Write-Offs
Loan portfolio by credit quality indicator
2018/Prior	43
Total loans	43
Real estate - mortgage | Domestic | Residential Junior Lien
Loan portfolio by credit quality indicator
2023	88,628
2022	76,845	92,256
2021	96,411	109,127
2020	76,490	91,130
2019	34,870	41,273
2018/Prior	87,625	21,975
Prior		84,509
Total loans	460,869	440,270
Current-period gross writeoffs
Total	298	28	25
Real estate - mortgage | Domestic | Residential Junior Lien | Pass
Loan portfolio by credit quality indicator
2023	88,628
2022	76,845	92,256
2021	96,411	108,815
2020	76,490	91,130
2019	34,870	41,273
2018/Prior	87,625	21,975
Prior		84,509
Total loans	460,869	439,958
Real estate - mortgage | Domestic | Residential Junior Lien | Watch List - Doubtful
Loan portfolio by credit quality indicator
2021		312
Total loans		312
Real estate - mortgage | Domestic | Residential Junior Lien | Current Period Gross Write-Offs
Loan portfolio by credit quality indicator
2018/Prior	298
Total loans	298
Consumer
Loan portfolio by credit quality indicator
Total loans	45,121	41,592
Consumer | Domestic
Loan portfolio by credit quality indicator
2023	36,639
2022	5,366	31,962
2021	1,043	6,603
2020	237	897
2019	157	489
2018/Prior	1,679	28
Prior		1,613
Total loans	45,121	41,592
Current-period gross writeoffs
Total	179	223	176
Consumer | Domestic | Pass
Loan portfolio by credit quality indicator
2023	36,639
2022	5,366	31,962
2021	1,043	6,603
2020	237	897
2019	157	489
2018/Prior	1,679	28
Prior		1,613
Total loans	45,121	41,592
Consumer | Domestic | Current Period Gross Write-Offs
Loan portfolio by credit quality indicator
2023	54
2022	115
2021	9
2019	1
Total loans	179
Foreign.
Loan portfolio by credit quality indicator
Total loans	180,695	159,975
Foreign. | Foreign
Loan portfolio by credit quality indicator
2023	116,104
2022	43,842	124,265
2021	12,317	19,082
2020	2,016	5,362
2019	2,797	4,848
2018/Prior	3,619	3,417
Prior		3,001
Total loans	180,695	159,975
Current-period gross writeoffs
Total			$ 1
Foreign. | Foreign | Pass
Loan portfolio by credit quality indicator
2023	116,104
2022	43,842	124,265
2021	12,317	19,082
2020	2,016	5,362
2019	2,797	4,848
2018/Prior	3,619	3,417
Prior		3,001
Total loans	$ 180,695	$ 159,975

Bank Premises and Equipment (De

Bank Premises and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Bank premises and equipment
Less: accumulated depreciation	$ (579,387)	$ (556,665)
Bank premises and equipment, net	437,094	431,612
Bank buildings and improvements [Member]
Bank premises and equipment
Bank premises and equipment, gross	$ 582,075	571,665
Bank buildings and improvements [Member] | Minimum
Bank premises and equipment
Estimated useful lives	5 years
Bank buildings and improvements [Member] | Maximum [Member]
Bank premises and equipment
Estimated useful lives	39 years
Furniture equipment and Vehicles [Member]
Bank premises and equipment
Bank premises and equipment, gross	$ 325,855	307,990
Furniture equipment and Vehicles [Member] | Minimum
Bank premises and equipment
Estimated useful lives	1 year
Furniture equipment and Vehicles [Member] | Maximum [Member]
Bank premises and equipment
Estimated useful lives	20 years
Land [Member]
Bank premises and equipment
Bank premises and equipment, gross	$ 108,551	$ 108,622

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Identified intangible assets
Carrying Amount	$ 60,697,000	$ 60,697,000
Accumulated Amortization	60,697,000	60,697,000
Amortization expense	0	0	$ 0
Changes in carrying amount of goodwill	0	0
Core Deposits [Member]
Identified intangible assets
Carrying Amount	58,675,000	58,675,000
Accumulated Amortization	58,675,000	58,675,000
Contractual Rights [Member]
Identified intangible assets
Carrying Amount	2,022,000	2,022,000
Accumulated Amortization	$ 2,022,000	$ 2,022,000

Deposits (Details)

Deposits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Demand non-interest bearing
Domestic	$ 4,126,635	$ 4,744,299
Foreign	904,210	1,101,756
Total demand non-interest bearing	5,030,845	5,846,055
Savings and interest-bearing demand
Domestic	3,161,411	3,448,717
Foreign	1,207,121	1,297,051
Total savings and interest-bearing demand	4,368,532	4,745,768
$100,000 or more
Time, certificate of deposit	1,867,129
Less than $100,000
Domestic	289,565	276,660
Foreign	268,483	246,832
Total time, certificates of deposit	2,425,177	2,068,184
Total deposits	11,824,554	12,660,007
Savings and interest-bearing demand
Domestic	42,148	9,196	$ 3,268
Foreign	18,189	3,490	842
Total savings and interest-bearing demand	60,337	12,686	4,110
$100,000 or more
Domestic	18,597	5,528	6,652
Foreign	25,471	3,867	3,452
Less than $100,000
Domestic	4,592	1,027	984
Foreign	4,498	735	567
Total time, certificates of deposit	53,158	11,157	11,655
Total interest expense on deposits	113,495	23,843	$ 15,765
Domestic
$100,000 or more
Time, certificate of deposit	763,419	652,073
Foreign
$100,000 or more
Time, certificate of deposit	$ 1,103,710	$ 892,619

Deposits (Scheduled Maturities)

Deposits (Scheduled Maturities) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Scheduled maturities of time deposits
2024	$ 2,301,914
2025	85,385
2026	23,102
2027	14,200
2028	573
Thereafter	3
Total time, certificates of deposit	2,425,177	$ 2,068,184
Time Deposits 250,000 or exceed	749,169,000	$ 585,456,000
Scheduled maturities of time deposits in amounts of $100,000 or more
Due within 3 months or less	859,734
Due after 3 months and within 6 months	517,994
Due after 6 months and within 12 months	409,193
Due after 12 months	80,208
Total	$ 1,867,129

Securities Sold Under Repurch_3

Securities Sold Under Repurchase Agreements (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Collateral Securities and Repurchase Borrowing agreements
Average outstanding amount	$ 469,152,000	$ 476,877,000
Maximum amount outstanding at any month end	544,418,000	513,368,000
Collateralized Securities, Book Value of Securities Sold	694,112,000	685,343,000
Collateralized securities, Fair Value of Securities Sold	609,701,000	576,605,000
Repurchase Borrowing, Balance of Liability	$ 530,416,000	$ 431,191,000
Repurchase Borrowing, Weighted Average Interest Rate (as a percent)	3.78%	1.60%
Maturity Overnight [Member]
Collateral Securities and Repurchase Borrowing agreements
Collateralized Securities, Book Value of Securities Sold	$ 667,647,000	$ 664,491,000
Collateralized securities, Fair Value of Securities Sold	587,673,000	559,637,000
Repurchase Borrowing, Balance of Liability	$ 518,650,000	$ 419,703,000
Repurchase Borrowing, Weighted Average Interest Rate (as a percent)	3.76%	1.61%
Maturity up to 30 days [Member]
Collateral Securities and Repurchase Borrowing agreements
Collateralized Securities, Book Value of Securities Sold	$ 24,842,000
Collateralized securities, Fair Value of Securities Sold	20,454,000
Repurchase Borrowing, Balance of Liability	$ 10,696,000
Repurchase Borrowing, Weighted Average Interest Rate (as a percent)	4.50%
Maturity over 90 days [Member]
Collateral Securities and Repurchase Borrowing agreements
Collateralized Securities, Book Value of Securities Sold	$ 1,623,000	$ 20,852,000
Collateralized securities, Fair Value of Securities Sold	1,574,000	16,968,000
Repurchase Borrowing, Balance of Liability	$ 1,070,000	$ 11,488,000
Repurchase Borrowing, Weighted Average Interest Rate (as a percent)	4%	1.32%

Other Borrowed Funds (Details)

Other Borrowed Funds (Details)	12 Months Ended
	Dec. 31, 2023 USD ($) loan	Dec. 31, 2022 USD ($)
Federal Home Loan Bank advances
Other borrowed funds	$ 10,745,000	$ 10,944,000
Long-term Debt [Member]
Federal Home Loan Bank advances
Other borrowed funds	$ 10,745,000	$ 10,944,000
Rate on balance outstanding at year end (as a percent)	2.61%	2.61%
Average daily balance	$ 10,837,000	$ 386,924,000
Average rate (as a percent)	2.61%	1.75%
Maximum amount outstanding at any month end	$ 10,928,000	$ 436,122,000
Long-term Debt [Member] | Federal Home Loan Bank non-amortizing advances
Federal Home Loan Bank advances
Other borrowed funds		$ 425,000,000
Long-term Debt [Member] | Federal Home Loan Bank amortizing advances
Federal Home Loan Bank advances
Number of amortizing advances | loan	2
Amortizing in 2024	$ 204,000
Amortizing in 2025	210,000
Amortizing in 2026	215,000
Amortizing in 2027	221,000
Amortizing in 2028	227,000
Long-term Debt [Member] | Federal Home Loan Bank advances maturing December 2033
Federal Home Loan Bank advances
Other borrowed funds	2,914,000
Long-term Debt [Member] | Federal Home Loan Bank advances maturing November 2033
Federal Home Loan Bank advances
Other borrowed funds	$ 7,831,000

Junior Subordinated Interest _3

Junior Subordinated Interest Deferrable Debentures (Details)	12 Months Ended
	Dec. 31, 2023 USD ($) item	Dec. 31, 2022 USD ($)
Junior Subordinated Interest Deferrable Debentures
Number of statutory business trusts issuing trust preferred securities | item	4
Junior subordinated deferrable interest debentures | $	$ 108,868,000	$ 134,642,000
Maximum number of consecutive quarterly period available for deferral of interest payment on Trusts IX, X, XI and XII | item	20
Percentage of capital securities issued by trust qualifying as Tier I capital, maximum	25%
Percentage of capital securities issued by trust qualifying as Tier II capital, minimum	25%
Capital securities issued by the trust, qualifying as Tier I capital | $	$ 108,868,000	$ 134,642,000

Junior Subordinated Interest _4

Junior Subordinated Interest Deferrable Debentures (Key Information) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Junior subordinated interest deferrable debentures, major types of business trusts
Junior subordinated deferrable interest debentures	$ 108,868,000	$ 134,642,000
Trust IX
Junior subordinated interest deferrable debentures, major types of business trusts
Junior subordinated deferrable interest debentures	$ 41,238,000
Interest rate (as a percent)	7.28%
Interest rate index	SOFR
Spread on interest rate index (as a percent)	1.62%
Trust X
Junior subordinated interest deferrable debentures, major types of business trusts
Junior subordinated deferrable interest debentures	$ 21,021,000
Interest rate (as a percent)	7.29%
Interest rate index	SOFR
Spread on interest rate index (as a percent)	1.65%
Trust XI
Junior subordinated interest deferrable debentures, major types of business trusts
Junior subordinated deferrable interest debentures	$ 25,990,000
Interest rate (as a percent)	7.28%
Interest rate index	SOFR
Spread on interest rate index (as a percent)	1.62%
Trust XII
Junior subordinated interest deferrable debentures, major types of business trusts
Junior subordinated deferrable interest debentures	$ 20,619,000
Interest rate (as a percent)	7.09%
Interest rate index	SOFR
Spread on interest rate index (as a percent)	1.45%

Earnings per Share ("EPS") (Det

Earnings per Share ("EPS") (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Basic EPS
Net income available to common shareholders	$ 411,768	$ 300,232	$ 253,922
Shares (Denominator)	62,082,827	62,658,414	63,352,737
Per Share Amount	$ 6.63	$ 4.79	$ 4.01
Diluted EPS
Net income available to common shareholders	$ 411,768	$ 300,232	$ 253,922
Potential dilutive common shares	138,774	151,820	133,629
Shares (Denominator)	62,221,601	62,810,234	63,486,366
Per Share Amount (in dollars per share)	$ 6.62	$ 4.78	$ 4

Employees' Profit Sharing Plan

Employees' Profit Sharing Plan (Details) - Deferred Profit Sharing [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Employees' profit sharing plan
Minimum period of continuous employment to be fully vested	1 year
Profit sharing costs	$ 4,011	$ 4,300	$ 3,550

International Operations (Detai

International Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Loans and Leases Receivable, Other Information [Abstract]
Loans	$ 8,058,961	$ 7,430,603
Less allowance for credit losses	(157,069)	(125,972)	$ (110,374)	$ (109,059)
Net loans	7,901,892	7,304,631
Accrued interest receivable	65,302	45,787
International Banking Services [Member]
Loans and Leases Receivable, Other Information [Abstract]
Accrued interest receivable	876	515
Outstanding standby and commercial letters of credit	147,551	131,254
Revenues	8,212	4,821	$ 4,090
International Banking Services [Member] | Foreign
Loans and Leases Receivable, Other Information [Abstract]
Loans	180,695	159,975
Less allowance for credit losses	(1,283)	(968)
Net loans	179,412	159,007
International Banking Services [Member] | Foreign | Commercial
Loans and Leases Receivable, Other Information [Abstract]
Loans	106,241	103,748
International Banking Services [Member] | Foreign | Others
Loans and Leases Receivable, Other Information [Abstract]
Loans	$ 74,454	$ 56,227

Income Taxes (Current and Defer

Income Taxes (Current and Deferred Portions of Net Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current
U.S.	$ 82,657	$ 66,670	$ 59,591
State	6,137	5,118	5,272
Total current taxes	88,794	71,788	64,863
Deferred
U.S.	23,001	10,555	3,794
State	(51)	64	(252)
Total deferred taxes	22,950	10,619	3,542
Total income taxes	$ 111,744	$ 82,407	$ 68,405

Income Taxes (Income Tax Expens

Income Taxes (Income Tax Expense Differences from the Amount Computed by Applying the U.S. Federal Income Tax Rate) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Taxes
U.S. Federal income tax rate (as a percent)	21%	21%	21%
Reasons for the difference of income tax expense
Computed expected tax expense	$ 110,065	$ 80,893	$ 68,011
Change in taxes resulting from:
Tax-exempt interest income	(3,663)	(2,433)	(2,970)
State tax, net of federal income taxes and tax credit and refunds	4,808	4,094	3,966
Other investment income	(2,761)	(1,391)	(1,753)
Net investment expense, low-income housing investment	1,974	1,906	203
Other	1,321	(662)	948
Total income taxes	$ 111,744	$ 82,407	$ 68,405

Income Taxes (Deferred Tax Asse

Income Taxes (Deferred Tax Assets and Deferred Tax Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets:
Loans receivable, principally due to the allowance for probable loan losses	$ 32,136	$ 25,982
Other real estate owned	1,649	1,194
Accrued expenses	581	186
Net unrealized losses on available for sale investment securities	110,584	130,586
Other	1,352	2,308
Total deferred tax assets	146,302	160,256
Deferred tax liabilities:
Bank premises and equipment, principally due to differences on depreciation	(14,879)	(13,615)
Impairment charges on available-for-securities	(19)	(19)
Identified intangible assets and goodwill	(14,151)	(14,125)
Partnership investment pass through	(58,376)	(30,319)
Other	(3,321)	(3,555)
Total deferred tax liabilities	90,746	61,633
Net deferred tax asset	$ 55,556	$ 98,623

Stock Options and Stock Appre_3

Stock Options and Stock Appreciation Rights - Options (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Apr. 05, 2012
Employee Stock Option
Stock option details
Shares available for future grants				800,000
Maximum exercisable period for granted share-based compensation	10 years
Black-Scholes-Merton option valuation model assumptions
Expected Life (Years)		7 years
Dividend yield (as a percent)		3.08%
Interest rate (as a percent)		1.94%
Volatility (as a percent)		37.78%
Stock option activity
Options outstanding at the beginning of the period (in shares)	461,822
Less:
Options exercised (in shares)	(46,444)
Options forfeited (in shares)	(31,513)
Options outstanding at the end of the period (in shares)	383,865	461,822
Options fully vested and exercisable at the end of the period (in shares)	232,143
Stock Options, Weighted average exercise price
Options outstanding at the beginning, weighted average exercise price (in dollars per share)	$ 29.67
Less:
Options exercised, weighted average exercise price (in dollars per share)	25.12
Options forfeited, weighted average exercise price (in dollars per share)	24.52
Options outstanding at the end, weighted average exercise price (in dollars per share)	30.65	$ 29.67
Options fully vested and exercisable at the end, weighted average exercise price (in dollars per share)	$ 27.80
Stock Options, Weighted average remaining contractual term (years)
Options outstanding at the end, weighted average remaining contractual term (years)	3 years 5 months 1 day
Options fully vested and exercisable at the end, weighted average remaining contractual term (years)	1 year 11 months 15 days
Stock Options, Aggregate intrinsic value
Options outstanding at the end, aggregate intrinsic value	$ 9,088,000
Options fully vested and exercisable at the end, aggregate intrinsic value	6,157,000
Stock-based compensation expense	330,000	$ 449,000	$ 506,000
Stock-based compensation cost, unrecognized	$ 507,000
Stock-based compensation cost, unrecognized, weighted-average period of recognition	1 year 3 months 18 days
Other information pertaining to option activity
Weighted average grant date fair value of stock options granted (in dollars per share)		$ 11.24	$ 10.20
Total fair value of stock options vested	$ 514,000	$ 514,000	$ 1,308,000
Total intrinsic value of stock options exercised	$ 1,060,000	$ 1,670,000	$ 2,536,000
Incentive Stock Options to 10 Percent Shareholders
Stock option details
Maximum exercisable period for granted share-based compensation	5 years

Stock Options and Stock Appre_4

Stock Options and Stock Appreciation Rights - SARs (Details) - Stock Appreciation Rights (SARs) - USD ($)		12 Months Ended
	Apr. 18, 2022	Dec. 31, 2023	Dec. 31, 2022
Stock option details
Shares available for future grants	750,000
Maximum exercisable period for granted share-based compensation	10 years
Number of rights issued		465,250
Vesting period	8 years
SARs
Outstanding beginning balance		489,250
Granted		465,250
Forfeited		(24,000)
Outstanding ending balance		465,250	489,250
Weighted average exercise price
Weighted average exercise price, beginning balance (per share)		$ 39.35
Weighted average exercise price, forfeited (per share)		39.33
Weighted average exercise price, ending balance (per share)		$ 39.35	$ 39.35
Aggregate intrinsic value
Aggregate intrinsic value		$ 6,964,000
Weighted average remaining contractual term (years)		8 years 6 months
Fair Value of Liability		$ 1,464,000	$ 546,000
Stock-based compensation expense		918,000	$ 546,000
Stock-based compensation cost, unrecognized		$ 5,090,000
Stock-based compensation cost, unrecognized, weighted-average period of recognition		8 years 6 months

Transactions with Related Par_2

Transactions with Related Parties (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Transactions with Related Parties
Receivables from related parties	$ 13,335,000	$ 28,708,000

Financial Instruments with Of_3

Financial Instruments with Off-Statement of Condition Risk and Concentrations of Credit Risk (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Maximum [Member]
Financial amounts of instruments, whose contract amounts represent credit risks
Credit risk commitment, maximum expiration date	1 year
Commitments to Extend Credit [Member]
Financial amounts of instruments, whose contract amounts represent credit risks
Outstanding amount of financial instruments whose, contract amounts represent credit risks	$ 3,340,280
Credit card lines [Member]
Financial amounts of instruments, whose contract amounts represent credit risks
Outstanding amount of financial instruments whose, contract amounts represent credit risks	14,181
Standby Letters of Credit [Member]
Financial amounts of instruments, whose contract amounts represent credit risks
Outstanding amount of financial instruments whose, contract amounts represent credit risks	147,190
Guarantee obligations, maximum exposure	147,190,000
Commercial Letters of Credit [Member]
Financial amounts of instruments, whose contract amounts represent credit risks
Outstanding amount of financial instruments whose, contract amounts represent credit risks	361
Unsecured Letters of Credit [Member]
Financial amounts of instruments, whose contract amounts represent credit risks
Unsecured letters of credit	$ 23,677,000	$ 40,249,000

Capital Requirements (Details)

Capital Requirements (Details)	12 Months Ended
	Dec. 31, 2023 USD ($)
Capital Ratios
Dividend payable by subsidiaries, maximum	$ 1,229,500,000

Capital Requirements (Capital A

Capital Requirements (Capital Amounts and Ratios) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Parent Company
Capital Requirements
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Amount	$ 2,563,130	$ 2,232,723
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent)	0.2172%	0.2021%
Total Capital (to Risk Weighted Assets), Actual Amount	$ 2,790,171	$ 2,455,468
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent)	0.2365	0.2222
Tier 1 Capital (to Risk Weighted Assets), Actual Amount	$ 2,642,492	$ 2,324,903
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent)	0.2239	0.2104
Tier 1 Capital (to Average Assets), Actual Amount	$ 2,642,492	$ 2,324,903
Tier 1 capital (to Average Assets), Actual Ratio (as a percent)	0.1746	0.1459
Parent Company | Minimum
Capital Requirements
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount	$ 825,968	$ 773,398
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent)	0.07%	0.07%
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount	$ 1,238,952	$ 1,160,096
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent)	0.10500	0.10500
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount	$ 1,002,961	$ 939,126
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent)	0.08500	0.08500
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount	$ 605,262	$ 637,578
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Ratio (as a percent)	0.0400	0.0400
International Bank of Commerce Laredo
Capital Requirements
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Amount	$ 1,444,775	$ 1,310,616
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent)	0.1854%	0.1807%
Total Capital (to Risk Weighted Assets), Actual Amount	$ 1,542,462	$ 1,401,298
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent)	0.1979	0.1932
Tier 1 Capital (to Risk Weighted Assets), Actual Amount	$ 1,444,775	$ 1,310,616
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent)	0.1854	0.1807
Tier 1 Capital (to Average Assets), Actual Amount	$ 1,444,775	$ 1,310,616
Tier 1 capital (to Average Assets), Actual Ratio (as a percent)	0.1640	0.1309
International Bank of Commerce Laredo | Minimum
Capital Requirements
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount	$ 545,611	$ 507,625
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 506,639	$ 471,366
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent)	0.07%	0.07%
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	0.065%	0.065%
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount	$ 818,416	$ 761,438
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 779,444	$ 725,179
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent)	0.10500	0.10500
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	0.1000	0.1000
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount	$ 662,527	$ 616,402
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 623,555	$ 580,143
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent)	0.08500	0.08500
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	0.0800	0.0800
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount	$ 352,412	$ 400,489
Tier 1 Capital (to Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 440,515	$ 500,611
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Ratio (as a percent)	0.0400	0.0400
Tier 1 Capital (to Average Assets), To Be well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	0.0500	0.0500
International Bank of Commerce Brownsville
Capital Requirements
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Amount	$ 477,390	$ 232,689
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent)	0.2441%	0.2117%
Total Capital (to Risk Weighted Assets), Actual Amount	$ 500,268	$ 243,739
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent)	0.2558	0.2218
Tier 1 Capital (to Risk Weighted Assets), Actual Amount	$ 477,390	$ 232,689
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent)	0.2441	0.2117
Tier 1 Capital (to Average Assets), Actual Amount	$ 477,390	$ 232,689
Tier 1 capital (to Average Assets), Actual Ratio (as a percent)	0.1179	0.1348
International Bank of Commerce Brownsville | Minimum
Capital Requirements
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount	$ 136,883	$ 76,941
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 127,106	$ 71,445
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent)	0.07%	0.07%
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	0.065%	0.065%
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount	$ 205,325	$ 115,412
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 195,547	$ 109,916
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent)	0.10500	0.10500
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	0.1000	0.1000
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount	$ 166,215	$ 93,429
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 156,438	$ 87,933
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent)	0.08500	0.08500
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	0.0800	0.0800
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount	$ 161,919	$ 69,028
Tier 1 Capital (to Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 202,398	$ 86,286
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Ratio (as a percent)	0.0400	0.0400
Tier 1 Capital (to Average Assets), To Be well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	0.0500	0.0500
International Bank Of Commerce Oklahoma
Capital Requirements
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Amount	$ 232,965	$ 363,093
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent)	0.2072%	0.2086%
Total Capital (to Risk Weighted Assets), Actual Amount	$ 247,031	$ 383,804
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent)	0.2197	0.2205
Tier 1 Capital (to Risk Weighted Assets), Actual Amount	$ 232,965	$ 363,093
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent)	0.2072	0.2086
Tier 1 Capital (to Average Assets), Actual Amount	$ 232,965	$ 363,093
Tier 1 capital (to Average Assets), Actual Ratio (as a percent)	0.1472	0.0895
International Bank Of Commerce Oklahoma | Minimum
Capital Requirements
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount	$ 78,718	$ 121,855
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 73,095	$ 113,151
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent)	0.07%	0.07%
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	0.065%	0.065%
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount	$ 118,076	$ 182,782
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 112,454	$ 174,078
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent)	0.10500	0.10500
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	0.1000	0.1000
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount	$ 95,586	$ 147,966
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 89,963	$ 139,262
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent)	0.08500	0.08500
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	0.0800	0.0800
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount	$ 63,294	$ 162,246
Tier 1 Capital (to Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 79,117	$ 202,808
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Ratio (as a percent)	0.0400	0.0400
Tier 1 Capital (to Average Assets), To Be well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	0.0500	0.0500
Commerce Bank
Capital Requirements
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Amount	$ 97,334	$ 71,418
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent)	0.3657%	0.377%
Total Capital (to Risk Weighted Assets), Actual Amount	$ 100,660
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent)	0.3782	0.3876
Tier 1 Capital (to Risk Weighted Assets), Actual Amount	$ 97,334	$ 73,420
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent)	0.3657	0.3770
Tier 1 Capital (to Average Assets), Actual Amount	$ 97,334	$ 71,418
Tier 1 capital (to Average Assets), Actual Ratio (as a percent)	0.1450	0.1500
Commerce Bank | Minimum
Capital Requirements
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount	$ 18,628	$ 13,261
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 17,298	$ 12,314
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent)	0.07%	0.07%
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	0.065%	0.065%
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount	$ 27,943	$ 19,892
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 26,612	$ 18,945
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent)	0.10500	0.10500
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	0.1000	0.1000
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount	$ 22,620	$ 16,103
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 21,290	$ 15,156
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent)	0.08500	0.08500
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	0.0800	0.0800
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount	$ 26,858	$ 19,048
Tier 1 Capital (to Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 33,572	$ 23,811
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Ratio (as a percent)	0.0400	0.0400
Tier 1 Capital (to Average Assets), To Be well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	0.0500	0.0500
International Bank of Commerce Zapata
Capital Requirements
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Amount	$ 64,110	$ 98,087
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent)	0.3118%	0.4226%
Total Capital (to Risk Weighted Assets), Actual Amount	$ 66,680	$ 100,798
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent)	0.3243	0.4343
Tier 1 Capital (to Risk Weighted Assets), Actual Amount	$ 64,110	$ 98,087
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent)	0.3118	0.4226
Tier 1 Capital (to Average Assets), Actual Amount	$ 64,110	$ 98,087
Tier 1 capital (to Average Assets), Actual Ratio (as a percent)	0.1326	0.1439
International Bank of Commerce Zapata | Minimum
Capital Requirements
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount	$ 14,394	$ 16,248
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 13,366	$ 15,088
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent)	0.07%	0.07%
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	0.065%	0.065%
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount	$ 21,591	$ 24,372
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 20,563	$ 23,212
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent)	0.10500	0.10500
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	0.1000	0.1000
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount	$ 17,478	$ 19,730
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 16,450	$ 18,569
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent)	0.08500	0.08500
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	0.0800	0.0800
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount	$ 19,338	$ 27,270
Tier 1 Capital (to Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 24,172	$ 34,088
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Ratio (as a percent)	0.0400	0.0400
Tier 1 Capital (to Average Assets), To Be well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	0.0500	0.0500

Fair Value Measurements (Fair V

Fair Value Measurements (Fair Value By Level) (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Assets:
Available for sale debt securities	$ 4,822,341,000	$ 4,417,796,000
Equity Securities	5,417,000	5,358,000
Estimate of Fair Value Measurement
Assets:
Available for sale debt securities	4,822,341,000	4,417,796,000
Estimate of Fair Value Measurement | US Treasury Securities
Assets:
Available for sale debt securities		49,393,000
Estimate of Fair Value Measurement | Residential mortgage-backed securities
Assets:
Available for sale debt securities	4,660,099,000	4,209,212,000
Estimate of Fair Value Measurement | States and political subdivisions
Assets:
Available for sale debt securities	162,242,000	159,191,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1
Assets:
Equity Securities	5,417,000	5,358,000
Marketable Securities	5,417,000	5,358,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2
Assets:
Marketable Securities	4,822,341,000	4,417,796,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | US Treasury Securities
Assets:
Available for sale debt securities		49,393,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | Residential mortgage-backed securities
Assets:
Available for sale debt securities	4,660,099,000	4,209,212,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | States and political subdivisions
Assets:
Available for sale debt securities	162,242,000	159,191,000
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement
Assets:
Equity Securities	5,417,000	5,358,000
Marketable Securities	4,827,758,000	4,423,154,000
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement | US Treasury Securities
Assets:
Available for sale debt securities		49,393,000
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement | Residential mortgage-backed securities
Assets:
Available for sale debt securities	4,660,099,000	4,209,212,000
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement | States and political subdivisions
Assets:
Available for sale debt securities	$ 162,242,000	$ 159,191,000

Fair Value Measurements (Fair_2

Fair Value Measurements (Fair Value Measurement and Assumptions) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Non-financial assets:
Other real estate owned	$ 26,728,000	$ 30,144,000
Assumptions used in discounted cash flow model to determine fair value of investments classified within level 3
Doubtful and Impaired commercial collateral dependent loans	46,491,000	51,326,000
Impaired commercial collateral dependent receivables appraisals to determine fair value within immediately preceding twelve months	1,272,000	0
Impaired collateral dependent commercial loans with internal evaluation completed within last twelve months	35,061,000	51,326,000
Charges to allowance for probable loan losses in connection with other real estate owned	0	2,000	$ 2,000
Adjustment to fair value in connection with other real estate owned	2,538,000	1,627,000	$ 2,655,000
Fair Value, Measurements, Nonrecurring
Assumptions used in discounted cash flow model to determine fair value of investments classified within level 3
Change in net provision, impaired loans	10,221,000	2,346,000
Change in net provision, other real estate owned	2,538,000	1,627,000
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3
Assets:
Watch-List doubtful loans	46,124,000	30,743,000
Non-financial assets:
Other real estate owned	307,000	5,653,000
Fair Value, Measurements, Nonrecurring | Estimated Fair Value
Assets:
Watch-List doubtful loans	46,124,000	30,743,000
Non-financial assets:
Other real estate owned	$ 307,000	$ 5,653,000

Fair Value Measurements (Other

Fair Value Measurements (Other Assumptions) (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Deposits
Carrying amount of time deposits	$ 2,425,177,000	$ 2,068,184,000
Fair Value, Inputs, Level 3
Loans
Carrying amount of fixed rate performing loans	1,199,347,000	1,203,381,000
Estimated fair value of fixed rate performing loans	1,073,892,000	1,100,848,000
Deposits
Carrying amount of time deposits	2,425,177,000	2,068,184,000
Estimated fair value of time deposits	2,428,681,000	2,076,231,000
Fair Value, Inputs, Level 2
Other borrowed funds
Carrying amount of the long-term FHLB borrowings	10,745,000	10,944,000
Estimated fair value of long-term FHLB borrowings	$ 10,745,000	$ 10,944,000

International Bancshares Corp_7

International Bancshares Corporation (Parent Company Only) Financial Information Statements of Condition (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
ASSETS
Other investments	$ 343,452,000	$ 358,910,000
Notes loans	7,901,892,000	7,304,631,000
Goodwill	282,532,000	282,532,000
Other assets	250,215,000	263,137,000
Total assets	15,066,189,000	15,501,476,000
Liabilities:
Junior subordinated deferrable interest debentures	108,868,000	134,642,000
Other liabilities	143,832,000	219,933,000
Total liabilities	12,618,415,000	13,456,717,000
Shareholders' equity:
Common shares	96,467,000	96,420,000
Surplus	155,511,000	154,061,000
Retained earnings	3,029,088,000	2,695,567,000
Accumulated other comprehensive income (loss)	(397,889,000)	(470,497,000)
Total shareholders' equity before treasury stock	2,883,177,000	2,475,551,000
Less cost of shares in treasury	(435,403,000)	(430,792,000)
Total shareholders' equity	2,447,774,000	2,044,759,000	$ 2,308,481,000	$ 2,177,998,000
Total liabilities and shareholders' equity	15,066,189,000	15,501,476,000
Parent Company | Reportable Legal Entities
ASSETS
Cash	105,184,000	89,263,000
Other investments	111,382,000	114,901,000
Notes loans	62,150,000	42,519,000
Investment in subsidiaries	2,281,952,000	1,933,269,000
Goodwill	3,365,000	3,365,000
Other assets	8,617,000	7,181,000
Total assets	2,572,650,000	2,190,498,000
Liabilities:
Junior subordinated deferrable interest debentures	108,868,000	134,642,000
Due to IBC Trading	21,000	21,000
Other liabilities	15,987,000	11,076,000
Total liabilities	124,876,000	145,739,000
Shareholders' equity:
Common shares	96,467,000	96,420,000
Surplus	155,511,000	154,061,000
Retained earnings	3,029,088,000	2,695,567,000
Accumulated other comprehensive income (loss)	(397,889,000)	(470,497,000)
Total shareholders' equity before treasury stock	2,883,177,000	2,475,551,000
Less cost of shares in treasury	(435,403,000)	(430,792,000)
Total shareholders' equity	2,447,774,000	2,044,759,000
Total liabilities and shareholders' equity	$ 2,572,650,000	$ 2,190,498,000

International Bancshares Corp_8

International Bancshares Corporation (Parent Company Only) Financial Information Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Expenses:
Interest expense (Debentures)	$ 8,123	$ 5,037	$ 2,791
Provision for credit loss	34,576	21,651	7,955
Income before federal income taxes and equity in undistributed net income of subsidiaries	523,512	382,639	322,327
Income tax (benefit) expense	111,744	82,407	68,405
Net income	411,768	300,232	253,922
Parent Company | Reportable Legal Entities
Income:
Dividends from subsidiaries	179,000	222,175	80,882
Interest income on notes receivable	5,769	2,394	1,139
(Loss) income on other investments	(6,150)	8,662	9,662
Other	4	857	58
Total income	178,623	234,088	91,741
Expenses:
Interest expense (Debentures)	8,122	5,037	2,792
Provision for credit loss	500	437
Other	252	2,291	2,272
Total expenses	8,874	7,765	5,064
Income before federal income taxes and equity in undistributed net income of subsidiaries	169,749	226,323	86,677
Income tax (benefit) expense	(1,365)	504	1,358
Income before equity in undistributed net income of subsidiaries	171,114	225,819	85,319
Equity in undistributed net income of subsidiaries	240,654	74,413	168,603
Net income	$ 411,768	$ 300,232	$ 253,922

International Bancshares Corp_9

International Bancshares Corporation (Parent Company Only) Financial Information Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating activities:
Net Income (Loss)	$ 411,768	$ 300,232	$ 253,922
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit loss	34,576	21,651	7,955
Unrealized (gain) loss on equity securities with readily determinable fair values	(59)	721	123
Stock compensation expense	330	449	506
Increase (decrease) in other liabilities	10,757	42,018	(5,519)
Net cash provided by operating activities	474,432	387,941	291,681
Investing activities:
Net cash used in investing activities	(1,067,206)	(992,028)	(915,889)
Financing activities:
Redemption of long-term debt	(25,774)
Proceeds from stock transactions	1,167	1,537	2,414
Payments of cash dividends - common	(78,247)	(75,375)	(72,838)
Purchase of treasury stock	(4,611)	(52,048)	(716)
Net cash (used in) provided by financing activities	(843,892)	(517,431)	1,836,212
(Decrease) increase in cash and cash equivalents	(1,436,666)	(1,121,518)	1,212,004
Cash and cash equivalents at beginning of period	2,087,724	3,209,242	1,997,238
Cash and cash equivalents at end of period	651,058	2,087,724	3,209,242
Parent Company | Reportable Legal Entities
Operating activities:
Net Income (Loss)	411,768	300,232	253,922
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit loss	500	437
Unrealized (gain) loss on equity securities with readily determinable fair values	(14)	36	(51)
Stock compensation expense	330	449	506
Increase (decrease) in other liabilities	4,911	1,743	(8,084)
Equity in undistributed net income of subsidiaries	(240,654)	(74,413)	(168,603)
Net cash provided by operating activities	176,841	228,484	77,690
Investing activities:
Net decrease (increase) in notes receivable	(20,170)	(32,556)	1,549
Increase in other assets and other investments	(33,285)	(43,343)	(11,787)
Net cash used in investing activities	(53,455)	(75,899)	(10,238)
Financing activities:
Redemption of long-term debt	(25,774)
Proceeds from stock transactions	1,167	1,537	2,414
Payments of cash dividends - common	(78,247)	(75,375)	(72,838)
Purchase of treasury stock	(4,611)	(52,048)	(716)
Net cash (used in) provided by financing activities	(107,465)	(125,886)	(71,140)
(Decrease) increase in cash and cash equivalents	15,921	26,699	(3,688)
Cash and cash equivalents at beginning of period	89,263	62,564	66,252
Cash and cash equivalents at end of period	$ 105,184	$ 89,263	$ 62,564

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pay vs Performance Disclosure
Net Income (Loss)	$ 411,768	$ 300,232	$ 253,922

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Dec. 31, 2023
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false