International Bancshares (IBOC) 10-Q4 Nov 212021 Q3 Quarterly reportFinancial data

Company Profile

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2021	Nov. 01, 2021
Document and Entity Information
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2021
Document Transition Report	false
Entity File Number	000-09439
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 Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		63,367,206
Entity Central Index Key	0000315709
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Amendment Flag	false

Consolidated Statements of Cond

Consolidated Statements of Condition - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Assets
Cash and cash equivalents	$ 2,287,318,000	$ 1,997,238,000
Investment securities:
Held to maturity debt securities (Market value of $3,400 on September 30, 2021 and $3,400 on December 31, 2020)	3,400,000	3,400,000
Available for sale debt securities (Amortized cost of $4,540,752 on September 30, 2021 and $3,054,289 on December 31, 2020)	4,554,314,000	3,080,768,000
Equity securities with readily determinable fair values	6,132,000	6,202,000
Total investment securities	4,563,846,000	3,090,370,000
Loans	7,404,158,000	7,541,754,000
Less allowance for credit losses	(109,325,000)	(109,059,000)
Net loans	7,294,833,000	7,432,695,000
Bank premises and equipment, net	459,291,000	479,878,000
Accrued interest receivable	31,394,000	37,881,000
Other investments	298,664,000	254,413,000
Cash surrender value of life insurance policies	295,513,000	292,381,000
Goodwill	282,532,000	282,532,000
Other assets	164,105,000	162,079,000
Total assets	15,677,496,000	14,029,467,000
Deposits:
Demand-non-interest bearing	5,596,765,000	4,715,814,000
Savings and interest bearing demand	4,460,557,000	3,852,505,000
Time	2,186,651,000	2,153,541,000
Total deposits	12,243,973,000	10,721,860,000
Securities sold under repurchase agreements	424,397,000	428,148,000
Other borrowed funds	436,186,000	436,327,000
Junior subordinated deferrable interest debentures	134,642,000	134,642,000
Other liabilities	143,926,000	130,492,000
Total liabilities	13,383,124,000	11,851,469,000
Shareholders' equity:
Common shares of $1.00 par value. Authorized 275,000,000 shares; issued 96,343,252 shares on September 30, 2021 and 96,240,977 shares on December 31, 2020	96,343,000	96,241,000
Surplus	151,855,000	149,334,000
Retained earnings	2,414,183,000	2,289,626,000
Accumulated other comprehensive income	10,723,000	20,825,000
Total shareholders' equity before treasury stock	2,673,104,000	2,556,026,000
Less cost of shares in treasury, 32,979,001 shares on September 30, 2021 and 32,961,289 on December 31, 2020	(378,732,000)	(378,028,000)
Total shareholders' equity	2,294,372,000	2,177,998,000
Total liabilities and shareholders' equity	$ 15,677,496,000	$ 14,029,467,000

Consolidated Statements of Co_2

Consolidated Statements of Condition (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Consolidated Statements of Condition
Held to maturity, Market value (in dollars)	$ 3,400	$ 3,400
Available for sale, Amortized cost (in dollars)	$ 4,540,752	$ 3,054,289
Common shares, par value (in dollars per share)	$ 1	$ 1
Common shares, Authorized shares	275,000,000	275,000,000
Common shares, issued shares	96,343,252	96,240,977
Treasury, shares	32,979,001	32,961,289

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Consolidated Statements of Income - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Interest income:
Loans, including fees	$ 88,280	$ 90,614	$ 272,210	$ 287,608
Investment securities:
Taxable	11,669	8,469	21,558	40,049
Tax-exempt	360	605	1,132	2,024
Other interest income	883	295	2,145	564
Total interest income	101,192	99,983	297,045	330,245
Interest expense:
Savings deposits	1,082	1,028	3,001	5,424
Time deposits	2,814	4,292	8,941	15,581
Securities sold under repurchase agreements	165	164	448	777
Other borrowings	1,929	1,930	5,726	6,844
Junior subordinated deferrable interest debentures	692	756	2,102	3,109
Total interest expense	6,682	8,170	20,218	31,735
Net interest income	94,510	91,813	276,827	298,510
Provision for credit losses	2,801	8,770	5,137	36,595
Net interest income after provision for credit losses	91,709	83,043	271,690	261,915
Non-interest income:
Investment securities transactions, net	(12)		(16)	(5)
Other investments, net	5,490	3,235	68,495	3,621
Other income	6,641	5,574	17,905	17,223
Total non-interest income	47,209	40,117	181,352	108,843
Non-interest expense:
Employee compensation and benefits	30,552	31,718	91,262	100,367
Occupancy	6,491	6,677	18,638	19,346
Depreciation of bank premises and equipment	6,028	7,049	19,263	21,348
Professional fees	2,558	4,121	7,675	12,004
Deposit insurance assessments	1,026	810	2,840	1,012
Net expense, other real estate owned	438	1,341	5,351	7,178
Advertising	1,470	1,413	4,349	5,289
Software and software maintenance	4,115	4,964	13,081	14,712
Other	17,049	11,960	39,407	39,686
Total non-interest expense	69,727	70,053	201,866	220,942
Income before income taxes	69,191	53,107	251,176	149,816
Provision for income taxes	14,592	10,365	53,780	30,726
Net income	$ 54,599	$ 42,742	$ 197,396	$ 119,090
Basic earnings per common share:
Weighted average number of shares outstanding (in shares)	63,372,777	63,269,966	63,347,922	63,876,496
Net income (in dollars per share)	$ 0.86	$ 0.68	$ 3.12	$ 1.86
Fully diluted earnings per common share:
Weighted average number of shares outstanding (in shares)	63,498,542	63,386,292	63,479,174	64,001,883
Net income (in dollars per share)	$ 0.86	$ 0.67	$ 3.11	$ 1.86
Services charges on deposit accounts
Non-interest income:
Service charges	$ 17,294	$ 15,037	$ 47,971	$ 45,554
Other service charges, commissions and fees, Banking
Non-interest income:
Service charges	15,750	14,471	41,166	36,866
Other service charges, commissions and fees, Non-banking
Non-interest income:
Service charges	$ 2,046	$ 1,800	$ 5,831	$ 5,584

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Consolidated Statements of Comprehensive Income
Net income	$ 54,599	$ 42,742	$ 197,396	$ 119,090
Other comprehensive income, net of tax:
Net unrealized holding (losses) gains on securities available for sale arising during period (net of tax effects of $(2,015), $(2,366), $(2,689) and $7,993)	(7,578)	(8,901)	(10,115)	30,069
Reclassification adjustment for losses on securities available for sale included in net income (net of tax effects of $3, $0, $3 and $1)	9		13	4
Other comprehensive income, net of tax	(7,569)	(8,901)	(10,102)	30,073
Comprehensive income	$ 47,030	$ 33,841	$ 187,294	$ 149,163

Consolidated Statements of Co_3

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Consolidated Statements of Comprehensive Income
Net unrealized holding gains (losses) on securities available for sale arising during period, tax effects	$ (2,015)	$ (2,366)	$ (2,689)	$ 7,993
Reclassification adjustment for losses on securities available for sale included in net income, tax effects	$ 3	$ 0	$ 3	$ 1

Consolidated Statements of Shar

Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]Adjustment	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Adjustment	Total
Balance at Dec. 31, 2019	$ 96,215	$ 148,075		$ 2,200,568	$ 2,345	$ (329,150)		$ 2,118,053
Balance (in shares) at Dec. 31, 2019	96,215
Increase (decrease) in shareholders' equity
Net Income				119,090				119,090
Dividends:
Payable/Cash				(69,928)				(69,928)
Purchase of treasury stock						(48,878)		(48,878)
Exercise of stock options	$ 19	388						407
Exercise of stock options (in shares)	19
Stock compensation expense recognized in earnings		571						571
Other comprehensive income, net of tax:
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments					30,073			30,073
Balance at Sep. 30, 2020	$ 96,234	149,034	$ (8,333)	2,241,397	32,418	(378,028)	$ (8,333)	2,141,055
Balance (in shares) at Sep. 30, 2020	96,234
Balance at Jun. 30, 2020	$ 96,229	148,744		2,233,455	41,319	(377,887)		2,141,860
Balance (in shares) at Jun. 30, 2020	96,229
Increase (decrease) in shareholders' equity
Net Income				42,742				42,742
Dividends:
Payable/Cash				(34,800)				(34,800)
Purchase of treasury stock						(141)		(141)
Exercise of stock options	$ 5	114						119
Exercise of stock options (in shares)	5
Stock compensation expense recognized in earnings		176						176
Other comprehensive income, net of tax:
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments					(8,901)			(8,901)
Balance at Sep. 30, 2020	$ 96,234	149,034	$ (8,333)	2,241,397	32,418	(378,028)	$ (8,333)	2,141,055
Balance (in shares) at Sep. 30, 2020	96,234
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				197,396				197,396
Dividends:
Payable/Cash				(72,839)				(72,839)
Purchase of treasury stock						(704)		(704)
Exercise of stock options	$ 102	2,130						2,232
Exercise of stock options (in shares)	102
Stock compensation expense recognized in earnings		391						391
Other comprehensive income, net of tax:
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments					(10,102)			(10,102)
Balance at Sep. 30, 2021	$ 96,343	151,855		2,414,183	10,723	(378,732)		2,294,372
Balance (in shares) at Sep. 30, 2021	96,343
Balance at Jun. 30, 2021	$ 96,332	151,512		2,397,610	18,292	(378,076)		2,285,670
Balance (in shares) at Jun. 30, 2021	96,332
Increase (decrease) in shareholders' equity
Net Income				54,599				54,599
Dividends:
Payable/Cash				(38,026)				(38,026)
Purchase of treasury stock						(656)		(656)
Exercise of stock options	$ 11	225						236
Exercise of stock options (in shares)	11
Stock compensation expense recognized in earnings		118						118
Other comprehensive income, net of tax:
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments					(7,569)			(7,569)
Balance at Sep. 30, 2021	$ 96,343	$ 151,855		$ 2,414,183	$ 10,723	$ (378,732)		$ 2,294,372
Balance (in shares) at Sep. 30, 2021	96,343

Consolidated Statements of Sh_2

Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Consolidated Statements of Shareholders' Equity
Payable/Cash Dividends (in dollars per share)	$ 0.60	$ 0.55	$ 1.15	$ 1.10
Purchase of treasury stock (in shares)	16,713	5,016	17,712	1,946,228

Consolidated Statements of Cash

Consolidated Statements of Cash Flows	9 Months Ended
Consolidated Statements of Cash Flows	Sep. 30, 2021USD ($)	Sep. 30, 2020USD ($)
Operating activities:
Net income	$ 197,396,000	$ 119,090,000
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit loss	5,137,000	36,595,000
Specific reserve, other real estate owned	2,065,000	702,000
Depreciation of bank premises and equipment	19,263,000	21,348,000
Loss (gain) on sale of bank premises and equipment	5,000	(248,000)
Loss (gain) on sale of other real estate owned	160,000	(361,000)
Accretion of investment securities discounts	(440,000)	(367,000)
Amortization of investment securities premiums	29,749,000	26,673,000
Investment securities transactions, net	16,000	5,000
Unrealized loss (gain) on equity securities with readily determinable fair values	70,000	(87,000)
Proceeds from settlements of claims	2,870,000
Stock based compensation expense	391,000	571,000
(Earnings) losses from affiliates and other investments	(66,746,000)	1,270,000
Deferred income taxes	(792,000)	(17,443,000)
Decrease in accrued interest receivable	6,487,000	576,000
Decrease in other assets	7,436,000	10,724,000
Increase in other liabilities	21,381,000	15,799,000
Net cash provided by operating activities	224,448,000	214,847,000
Investing activities:
Proceeds from maturities of securities	1,200,000	1,075,000
Proceeds from sales and calls of available for sale securities	5,890,000	28,795,000
Purchases of available for sale securities	(2,856,135,000)	(1,336,445,000)
Principal collected on mortgage backed securities	1,333,256,000	1,397,733,000
Net decrease (increase) in loans	116,355,000	(684,471,000)
Purchases of other investments	(45,184,000)	(38,985,000)
Distributions from other investments	60,207,000	64,870,000
Purchases of bank premises and equipment	(6,070,000)	(6,245,000)
Proceeds from sales of bank premises and equipment	1,278,000	879,000
Proceeds from sales of other real estate owned	7,925,000	4,248,000
Net cash used in investing activities	(1,381,278,000)	(568,546,000)
Financing activities:
Net increase in non-interest bearing demand deposits	880,951,000	976,195,000
Net (decrease) increase in savings and interest bearing demand deposits	608,052,000	423,075,000
Net increase in time deposits	33,110,000	81,429,000
Net increase in securities sold under repurchase agreements	(3,751,000)	139,313,000
Net decrease in other borrowed funds	(141,000)	(190,138,000)
Purchase of treasury stock	(704,000)	(48,878,000)
Proceeds from stock transactions	2,232,000	407,000
Payments of cash dividends	(72,839,000)	(35,128,000)
Net cash provided by financing activities	1,446,910,000	1,346,275,000
Increase in cash and cash equivalents	290,080,000	992,576,000
Cash and cash equivalents at beginning of period	1,997,238,000	256,820,000
Cash and cash equivalents at end of period	2,287,318,000	1,249,396,000
Supplemental cash flow information:
Interest paid	21,127,000	33,880,000
Income taxes paid	47,392,000	34,826,000
Non-cash investing and financing activities:
Net transfers from loans to other real estate owned	$ 16,370,000	4,526,000
Dividends declared, not yet paid on common stock		34,800,000
Net transfers from bank premises and equipment to other assets		$ 4,260,000

Basis of Presentation

Basis of Presentation	9 Months Ended
Basis of Presentation	Sep. 30, 2021
Basis of Presentation
Basis of Presentation	Note 1 — Basis of Presentation Our accounting and reporting policies conform to accounting principles generally accepted in the United States of America and to general practices within the banking industry. Our consolidated financial statements include the accounts of International Bancshares Corporation, and our wholly-owned bank subsidiaries, International Bank of Commerce, Laredo (“IBC”), Commerce Bank, International Bank of Commerce, Zapata, International Bank of Commerce, Brownsville, International Bank of Commerce, Oklahoma (the “Subsidiary Banks”) and our wholly-owned non-bank subsidiaries, IBC Trading Company, Premier Tierra Holdings, Inc., IBC Charitable and Community Development Corporation, Emerald Galveston Holdings, LLC and IBC Capital Corporation. Our consolidated financial statements are unaudited, but include all adjustments, which, in the opinion of management, are necessary for a fair presentation of the results of the periods presented. All such adjustments were of a normal and recurring nature. These financial statements should be read in conjunction with the financial statements and the notes thereto in our latest Annual Report on Form 10-K. Our consolidated statement of condition at December 31, 2020 has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by accounting principles generally accepted in the United States of America (“US GAAP”) for complete financial statements. Certain reclassifications have been made to make prior periods comparable. Operating results for the three and nine months ended September 30, 2021 are not necessarily indicative of the results for the year ending December 31, 2021 or any future period. 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 statements presented in this report. We have five active operating subsidiaries, the Subsidiary Banks. We apply the provisions of Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”), FASB ASC 280, “Segment Reporting,” in determining our reportable segments and related disclosures. 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. In June 2016, the FASB issued Accounting Standards Update No. 2016-13 to ASC 326, “Financial Instruments – Credit Losses.” The update amends existing standards for accounting for credit losses for financial assets. The update requires that the expected credit losses on the financial instruments held as of the end of the period being reported be measured based on historical experience, current conditions, and reasonable and supportable forecasts. The update also expands the required disclosures related to significant estimates and judgements used in estimating credit losses, as well as the credit quality and underwriting standards of an organization’s financial assets. The update also amended the accounting for credit losses on available-for-sale debt securities and purchased financial assets with credit deterioration. The impact of the adoption of the standard is to be recorded as a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is adopted. The accounting standard was effective for us on January 1, 2020. The task force formed last year, which includes key members of the teams that work with the current calculation of the allowance for probable loan losses plus members representing the corporate accounting and risk management areas, has worked with the implementation of the update and validation to complete our model/tool. Based on the composition of the portfolio at December 31, 2019 and after finalizing the methodology, the adoption of the update increased our allowance for probable loan losses (referred to as the allowance for credit losses under ASU 2016-13), by approximately 17.2%, resulting in a cumulative-effect adjustment to retained earnings of approximately $8.3 million, net of tax. Please refer to Note 4 – Allowance for Credit Losses and the Critical Accounting Policies discussion in Management’s Discussion and Analysis.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
Fair Value Measurements	Sep. 30, 2021
Fair Value Measurements
Fair Value Measurements	Note 2 — Fair Value Measurements 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 inputs, 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. The following table represents assets and liabilities reported on the consolidated balance sheets at their fair value on a recurring basis as of September 30, 2021 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 September 30, 2021 (Level 1) (Level 2) (Level 3) Measured on a recurring basis: Assets: Available for sale debt securities Residential mortgage-backed securities $ 4,509,643 $ — $ 4,509,643 $ — States and political subdivisions 44,671 — 44,671 — Equity Securities 6,132 6,132 — — $ 4,560,446 $ 6,132 $ 4,554,314 $ — The following table represents assets and liabilities reported on the consolidated balance sheets at their fair value on a recurring basis as of December 31, 2020 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, 2020 (Level 1) (Level 2) (Level 3) Measured on a recurring basis: Assets: Available for sale securities Residential mortgage - backed securities $ 3,029,954 $ — $ 3,029,954 $ — States and political subdivisions 50,814 — 50,814 — Equity Securities 6,202 6,202 — — $ 3,086,970 $ 6,202 $ 3,080,768 $ — Available-for-sale debt securities are classified within Level 1 or 2 of the valuation hierarchy. Equity securities with readily determinable fair values are classified within Level 1. For debt investments 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 assets and financial liabilities are measured at fair value on a non-recurring basis. The instruments 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 September 30, 2021 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 Provision Period ended Identical Observable Unobservable (Credit) September 30, Assets Inputs Inputs During 2021 (Level 1) (Level 2) (Level 3) Period Measured on a non-recurring basis: Assets: Watch-List doubtful loans $ 57 $ — $ — $ 57 $ 209 Other real estate owned $ 1,685 $ — $ — $ 1,685 $ 2,065 The following table represents financial instruments measured at fair value on a non-recurring basis as of and for the period ended December 31, 2020 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 (Credit) Year ended for Identical Observable Unobservable Provision December 31, Assets Inputs Inputs During 2020 (Level 1) (Level 2) (Level 3) Period Measured on a non-recurring basis: Assets: Watch-List doubtful loans $ 393 $ — $ — $ 393 $ (86) Other real estate owned 6,241 — — 6,241 1,539 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 allowance for credit losses. 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 September 30, 2021, we had $815,000 of doubtful commercial collateral dependent loans, of which $0 had an appraisal performed within the immediately preceding twelve months, and of which $815,000 had an evaluation performed within the immediately preceding twelve months. As of December 31, 2020, we had approximately $18,361,000 of doubtful commercial collateral dependent loans, of which $16,587,000 had an appraisal performed within the immediately preceding twelve months and of which $1,283,000 had an evaluation performed within the immediately preceding twelve months. Our 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 analysis of the doubtful loan. 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 allowance for credit losses (“ACL”), 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 three and nine months ended September 30, 2021 and the twelve months ended December 31, 2020, we recorded $2, $2 n charges to the ACL in connection with loans transferred to other real estate owned. For the three and nine months ended September 30, 2021 and the twelve months ended December 31, 2020, we recorded $0, $2,065,000 and $1,539,000, 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 September 30, 2021 and December 31, 2020 are outlined below. Cash and Cash Equivalents For these short-term instruments, the carrying amount is a reasonable estimate of fair value. Time Deposits with Banks The carrying amounts of time deposits with banks approximate fair value. Investment Securities Held-to-Maturity The carrying amounts of investments held-to-maturity approximate fair value. Investment Securities For investment securities, which 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 6. 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 September 30, 2021 and December 31, 2020, the carrying amount of fixed rate performing loans w 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 September 30, 2021 and December 31, 2020. The fair value of time deposits is based on the discounted value of contractual cashflows. The discount rate is based on currently offered rates. Time deposits are within Level 3 of the fair value hierarchy. At September 30, 2021 and December 31, 2020, the carrying amount of time deposits was $2,186,651,000 and $2,153,541,000, respectively, and the estimated fair value was $2,184,386,000 and $2,148,976,000, 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 September 30, 2021 and December 31, 2020. 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 September 30, 2021 and December 31, 2020. Other Borrowed Funds We currently have long-term borrowings issued from the Federal Home Loan Bank (“FHLB”). The long-term borrowings outstanding at September 30, 2021 and December 31, 2020 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 September 30, 2021 and December 31, 2020, the carrying amount of the fixed rate long-term FHLB borrowings was $436,186,000 and $436,372,000, respectively, and the estimated fair value was $466,315,000 and $480,475,000 , 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 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.

Loans

Loans	9 Months Ended
Loans	Sep. 30, 2021
Loans
Loans	Note 3 — Loans A summary of loans, by loan type at September 30, 2021 and December 31, 2020 is as follows: September 30, December 31, 2021 2020 (Dollars in Thousands) Commercial, financial and agricultural $ 4,680,091 $ 4,516,288 Real estate - mortgage 876,313 999,144 Real estate - construction 1,671,212 1,846,757 Consumer 40,699 40,595 Foreign 135,843 138,970 Total loans $ 7,404,158 $ 7,541,754

Allowance for Credit Losses

Allowance for Credit Losses	9 Months Ended
Allowance for Credit Losses	Sep. 30, 2021
Allowance for Credit Losses
Allowance for Credit Losses	Note 4 — Allowance for Credit Losses 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. This category includes loans secured by farmland, multifamily properties, owner occupied commercial properties, and non-owner occupied commercial properties. Owner occupied commercial properties include warehouses often along the border for import/export operations, office space where the borrower is the primary tenant, restaurants and other single-tenant retail. Non-owner occupied commercial properties include hotels, retail centers, office and professional buildings, and leased warehouses. These loans carry risk of repayment when market values deteriorate, the business experiences turnover in key management, the business has an inability to attract or keep occupancy levels stable, or when the market experiences an exit of a specific business type that is significant to the local economy, such as a manufacturing plant. 1-4 family mortgages. lines of credits, lots purchases, and home construction. Loan repayments may be affected by unemployment or underemployment and deteriorating market values of real estate. 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, (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) 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 TDR’s, (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 and geopolitical events. 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 transactions in the allowance for credit loan losses by loan class is as follows: Three Months Ended September 30, 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 June 30, 2021 $ 23,063 $ 33,603 $ 34,238 $ 4,206 $ 3,916 $ 8,196 $ 268 $ 791 $ 108,281 Losses charged to allowance (2,287) (2) — — (73) (4) (64) — (2,430) Recoveries credited to allowance 473 — 141 — 12 28 19 — 673 Net (losses) recoveries charged to allowance (1,814) (2) 141 — (61) 24 (45) — (1,757) Credit loss expense 1,955 503 871 9 (110) (496) 47 22 2,801 Balance at September 30, 2021 $ 23,204 $ 34,104 $ 35,250 $ 4,215 $ 3,745 $ 7,724 $ 270 $ 813 $ 109,325 Three Months Ended September 30, 2020 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 June 30, 2020 $ 20,079 $ 40,924 $ 18,711 $ 1,864 $ 3,208 $ 8,964 $ 288 $ 516 $ 94,554 Losses charged to allowance (1,735) — — — (87) (3) (62) — (1,887) Recoveries credited to allowance 523 14 86 — 8 51 46 — 728 Net (losses) recoveries charged to allowance (1,212) 14 86 — (79) 48 (16) — (1,159) Credit loss expense 3,277 (2,855) 4,892 2,639 400 293 2 122 8,770 Balance at September 30, 2020 $ 22,144 $ 38,083 $ 23,689 $ 4,503 $ 3,529 $ 9,305 $ 274 $ 638 $ 102,165 Nine Months Ended September 30, 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 (5,835) (2) (356) — (262) (25) (151) — (6,631) Recoveries credited to allowance 1,429 — 160 — 47 86 38 — 1,760 Net (losses) recoveries charged to allowance (4,406) (2) (196) — (215) 61 (113) — (4,871) Credit loss expense 5,702 (3,506) 5,446 (836) 86 (1,907) 92 60 5,137 Balance at September 30, 2021 $ 23,204 $ 34,104 $ 35,250 $ 4,215 $ 3,745 $ 7,724 $ 270 $ 813 $ 109,325 Nine Months Ended September 30, 2020 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, 2019 $ 11,145 $ 18,152 $ 16,533 $ 1,786 $ 3,762 $ 7,535 $ 542 $ 823 $ 60,278 Adoption of ASU 2016-13 4,247 13,391 (4,292) (355) (1,580) (429) (225) (410) 10,347 Losses charged to allowance (6,696) (19) (55) — (123) (124) (192) — (7,209) Recoveries credited to allowance 1,793 15 107 — 10 171 58 — 2,154 Net (losses) recoveries charged to allowance (4,903) (4) 52 — (113) 47 (134) — (5,055) Credit loss expense 11,655 6,544 11,396 3,072 1,460 2,152 91 225 36,595 Balance at September 30, 2020 $ 22,144 $ 38,083 $ 23,689 $ 4,503 $ 3,529 $ 9,305 $ 274 $ 638 $ 102,165 The credit loss expense charged to operations increased throughout 2020 as a result of increases in the ACL due to deteriorating economic conditions as a result of the novel Coronavirus Disease 2019 (“COVID-19”) and its variant strains the impact of those conditions on certain segments of our loan portfolio. Economic conditions during the first nine months of 2021 have stabilized and, in some segments, improved. The pool specific qualitative loss factors management deemed appropriate for the ACL calculation at December 31, 2020 remained constant in the September 30, 2021 ACL calculation, which positively impacted the calculation and resulted in a decrease in the credit loss expense charged to operations for the three and nine months ended September 30, 2021 compared to the same period of 2020. The table below provides additional information on the balance of loans individually or collectively evaluated for impairment and their related allowance, by loan class as of September 30, 2021 and December 31, 2020: September 30, 2021 Loans Individually Loans Collectively Evaluated For Evaluated For Impairment Impairment Recorded Recorded Investment Allowance Investment Allowance (Dollars in Thousands) Domestic Commercial $ 331 $ 29 $ 1,596,518 $ 23,175 Commercial real estate: other construction & land development 646 70 1,670,566 34,034 Commercial real estate: farmland & commercial 414 — 2,715,663 35,250 Commercial real estate: multifamily 137 — 367,028 4,215 Residential: first lien 89 — 385,544 3,745 Residential: junior lien 33 — 490,647 7,724 Consumer — — 40,699 270 Foreign — — 135,843 813 Total $ 1,650 $ 99 $ 7,402,508 $ 109,226 December 31, 2020 Loans Individually Loans Collectively Evaluated For Evaluated For Impairment Impairment Recorded Recorded Investment Allowance Investment Allowance (Dollars in Thousands) Domestic Commercial $ 1,189 $ 209 $ 1,784,747 $ 21,699 Commercial real estate: other construction & land development 17,496 70 1,829,261 37,542 Commercial real estate: farmland & commercial 439 — 2,288,869 30,000 Commercial real estate: multifamily 134 — 440,910 5,051 Residential: first lien 151 — 404,968 3,874 Residential: junior lien 38 — 593,987 9,570 Consumer — — 40,595 291 Foreign — — 138,970 753 Total $ 19,447 $ 279 $ 7,522,307 $ 108,780 The table below provides additional information on loans accounted for on a non-accrual basis by loan class at September 30, 2021 and December 31, 2020: September 30, 2021 December 31, 2020 (Dollars in Thousands) Domestic Commercial $ 331 $ 1,189 Commercial real estate: other construction & land development 646 17,496 Commercial real estate: farmland & commercial 414 439 Commercial real estate: multifamily 137 134 Residential: first lien 342 526 Residential: junior lien 33 38 Total non-accrual loans $ 1,903 $ 19,822 The following table details loans accounted for as “troubled debt restructuring,” segregated by loan class. Loans accounted for as troubled debt restructuring are included in Watch List—Doubtful loans. September 30, 2021 December 31, 2020 (Dollars in Thousands) Domestic Residential: first lien $ 1,934 $ 4,078 Residential: junior lien 106 521 Consumer 862 989 Foreign 17 233 Total troubled debt restructuring $ 2,919 $ 5,821 We are actively working with our customers affected by the current economic crisis arising from COVID-19. We have been offering and are prepared to continue to offer assistance in accordance with current regulatory guidance. That includes continuously reaching out to our customers and, in some cases, offering short-term payment deferral plans. As of November 1, 2021, we had approximately $226,831,000 in loans with some degree of payment deferrals in our system. In accordance with interagency regulatory guidance, these short-term deferrals are not considered troubled debt restructurings. The $226,831,000 is comprised primarily of loans related to industries that have been significantly impacted by the COVID-19 pandemic, including the hospitality sector, special use facilities, including child care centers, and retail developments. With the passage of the Paycheck Protection Program (“PPP”), administered by the Small Business Association (“SBA”), we assisted our customers with applications for loans through the PPP. PPP loans earn interest at 1% and PPP loans made prior to June 5, 2020 have a two-year term, while those made after June 5, 2020 have a five-year term; however, PPP loans also include forgiveness provisions that we expect most customers will utilize. Customers began submitting applications for the forgiveness program in the third quarter of 2020. PPP loans were intended to support up to weeks of payroll and certain other costs to help those businesses remain viable and allow their employees to pay their bills. As of November 1, 2021, we had 2,634 PPP loans totaling approximately $169,511,000 outstanding. The PPP loans are fully guaranteed by the U.S. government through the SBA. 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 our management believes 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 can be made only on a subjective basis. It is the judgment of our management that the ACL at September 30, 2021 was adequate to absorb probable losses from loans in the portfolio at that date. The following tables present information regarding the aging of past due loans by loan class at September 30, 2021 and December 31, 2020: September 30, 2021 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 $ 5,123 $ 221 $ 89 $ 89 $ 5,433 $ 1,591,416 $ 1,596,849 Commercial real estate: other construction & land development 21,433 188 — — 21,621 1,649,591 1,671,212 Commercial real estate: farmland & commercial 6,535 2,104 185 — 8,824 2,707,253 2,716,077 Commercial real estate: multifamily — — — — — 367,165 367,165 Residential: first lien 2,266 655 4,930 4,735 7,851 377,782 385,633 Residential: junior lien 515 104 1,842 1,842 2,461 488,219 490,680 Consumer 240 70 46 46 356 40,343 40,699 Foreign 1,231 1,482 360 360 3,073 132,770 135,843 Total past due loans $ 37,343 $ 4,824 $ 7,452 $ 7,072 $ 49,619 $ 7,354,539 $ 7,404,158 December 31, 2020 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 $ 1,931 $ 1,109 $ 563 $ 318 $ 3,603 $ 1,782,333 $ 1,785,936 Commercial real estate: other construction & land development 1,059 854 16,587 — 18,500 1,828,257 1,846,757 Commercial real estate: farmland & commercial 2,435 219 186 186 2,840 2,286,468 2,289,308 Commercial real estate: multifamily 126 — — — 126 440,918 441,044 Residential: first lien 2,399 926 6,165 5,890 9,490 395,629 405,119 Residential: junior lien 561 247 1,197 1,197 2,005 592,020 594,025 Consumer 318 71 79 79 468 40,127 40,595 Foreign 478 180 568 568 1,226 137,744 138,970 Total past due loans $ 9,307 $ 3,606 $ 25,345 $ 8,238 $ 38,258 $ 7,503,496 $ 7,541,754 The decrease in Commercial Real Estate – Other Construction and Land Development Loans 90 days or greater past due at September 30, 2021 can be primarily attributed to a relationship secured by commercial property that was placed on non-accrual in the fourth quarter of 2020 and foreclosed upon in the first quarter of 2021. A summary of the loan portfolio by credit quality indicator by loan class and by year of origination at September 30, 2021 and December 31, 2020 is presented below: 2021 2020 2019 2018 2017 Prior Total (Dollars in Thousands) Balance at September 30, 2021 Domestic Commercial Pass $ 775,702 $ 398,790 $ 126,858 $ 104,736 $ 67,433 $ 8,398 $ 1,481,917 Special Review 1,517 74,691 139 81 — — 76,428 Watch List - Pass 33,793 — — — — 10 33,803 Watch List - Substandard 3,232 297 781 60 — — 4,370 Watch List - Doubtful 106 134 — — 91 — 331 Total Commercial $ 814,350 $ 473,912 $ 127,778 $ 104,877 $ 67,524 $ 8,408 $ 1,596,849 Commercial real estate: other construction & land development Pass $ 657,381 $ 441,333 $ 413,856 $ 83,925 $ 15,826 $ 3,406 $ 1,615,727 Special Review 31,527 — 211 — — — 31,738 Watch List - Pass — 23,101 — — — — 23,101 Watch List - Doubtful 539 107 — — — — 646 Total Commercial real estate: other construction & land development $ 689,447 $ 464,541 $ 414,067 $ 83,925 $ 15,826 $ 3,406 $ 1,671,212 Commercial real estate: farmland & commercial Pass $ 771,884 $ 699,685 $ 326,176 $ 455,899 $ 197,313 $ 131,756 $ 2,582,713 Special Review 2,849 1,314 910 3,617 63 194 8,947 Watch List - Pass 17,503 44,143 — — 94 1 61,741 Watch List - Substandard 1,304 54,124 4,178 — 2,195 461 62,262 Watch List - Doubtful — 229 185 — — — 414 Total Commercial real estate: farmland & commercial $ 793,540 $ 799,495 $ 331,449 $ 459,516 $ 199,665 $ 132,412 $ 2,716,077 Commercial real estate: multifamily Pass $ 40,569 $ 81,107 $ 98,720 $ 76,109 $ 63,220 $ 7,303 $ 367,028 Watch List - Doubtful — 137 — — — — 137 Total Commercial real estate: multifamily $ 40,569 $ 81,244 $ 98,720 $ 76,109 $ 63,220 $ 7,303 $ 367,165 Residential: first lien Pass $ 85,763 $ 56,687 $ 65,531 $ 51,959 $ 31,709 $ 93,611 $ 385,260 Watch List - Substandard 57 — 103 — 123 1 284 Watch List - Doubtful — 89 — — — — 89 Total Residential: first lien $ 85,820 $ 56,776 $ 65,634 $ 51,959 $ 31,832 $ 93,612 $ 385,633 Residential: junior lien Pass $ 103,570 $ 141,368 $ 71,211 $ 35,364 $ 46,503 $ 92,631 $ 490,647 Watch List- Doubtful — 33 — — — — 33 Total Residential: junior lien $ 103,570 $ 141,401 $ 71,211 $ 35,364 $ 46,503 $ 92,631 $ 490,680 Residential: junior lien Consumer Pass $ 26,613 $ 10,196 $ 1,910 $ 332 $ 67 $ 1,581 $ 40,699 Total Consumer $ 26,613 $ 10,196 $ 1,910 $ 332 $ 67 $ 1,581 $ 40,699 Foreign Pass $ 69,895 $ 37,503 $ 9,082 $ 9,347 $ 5,238 $ 4,778 $ 135,843 Total Foreign $ 69,895 $ 37,503 $ 9,082 $ 9,347 $ 5,238 $ 4,778 $ 135,843 Total Loans $ 2,623,804 $ 2,065,068 $ 1,119,851 $ 821,429 $ 429,875 $ 344,131 $ 7,404,158 2020 2019 2018 2017 2016 Prior Total (Dollars in Thousands) Balance at December 31, 2020 Domestic Commercial Pass $ 1,168,671 $ 240,869 $ 145,670 $ 85,434 $ 13,901 $ 10,000 $ 1,664,545 Special Review 75,638 — — — — — 75,638 Watch List - Pass 39,886 11 — 3 — 17 39,917 Watch List - Substandard 3,360 683 289 — 315 — 4,647 Watch List - Doubtful 777 161 92 159 — — 1,189 Total Commercial $ 1,288,332 $ 241,724 $ 146,051 $ 85,596 $ 14,216 $ 10,017 $ 1,785,936 Commercial Commercial real estate: other construction & land development Pass $ 773,165 $ 576,707 $ 320,308 $ 78,174 $ 10,534 $ 3,343 $ 1,762,231 Special Review 20,828 21,650 — — — — 42,478 Watch List - Pass 23,101 1,451 — — — — 24,552 Watch List - Doubtful 16,702 794 — — — — 17,496 Total Commercial real estate: other construction & land development $ 833,796 $ 600,602 $ 320,308 $ 78,174 $ 10,534 $ 3,343 $ 1,846,757 Commercial real estate: farmland & commercial Pass $ 884,070 $ 373,993 $ 386,268 $ 189,639 $ 202,500 $ 116,729 $ 2,153,199 Special Review 3,041 — 4,758 177 3,218 — 11,194 Watch List - Pass 61,637 942 277 80 — — 62,936 Watch List - Substandard 53,809 4,986 — 2,269 475 1 61,540 Watch List - Doubtful — 202 — — — 237 439 Total Commercial real estate: farmland & commercial $ 1,002,557 $ 380,123 $ 391,303 $ 192,165 $ 206,193 $ 116,967 $ 2,289,308 Commercial real estate: multifamily Pass $ 74,577 $ 208,356 $ 82,818 $ 64,110 $ 6,801 $ 4,248 $ 440,910 Watch List - Doubtful 134 — — — — — 134 Total Commercial real estate: multifamily $ 74,711 $ 208,356 $ 82,818 $ 64,110 $ 6,801 $ 4,248 $ 441,044 Residential: first lien Pass $ 81,004 $ 62,165 $ 72,299 $ 54,593 $ 29,250 $ 105,463 $ 404,774 Watch List - Pass — 14 131 — — — 145 Watch List - Substandard — — — — 49 — 49 Watch List - Doubtful 86 — — — — 65 151 Total Residential: first lien $ 81,090 $ 62,179 $ 72,430 $ 54,593 $ 29,299 $ 105,528 $ 405,119 Residential: junior lien Pass $ 196,308 $ 108,276 $ 61,636 $ 75,056 $ 56,705 $ 94,454 $ 592,435 Special Review 740 — — 812 — — 1,552 Watch List- Doubtful — — 38 — — — 38 Total Residential: junior lien $ 197,048 $ 108,276 $ 61,674 $ 75,868 $ 56,705 $ 94,454 $ 594,025 Consumer Pass $ 30,910 $ 7,159 $ 875 $ 225 $ 55 $ 1,371 $ 40,595 Total Consumer $ 30,910 $ 7,159 $ 875 $ 225 $ 55 $ 1,371 $ 40,595 Foreign Pass $ 93,236 $ 19,092 $ 11,572 $ 6,192 $ 3,533 $ 5,345 $ 138,970 Total Foreign $ 93,236 $ 19,092 $ 11,572 $ 6,192 $ 3,533 $ 5,345 $ 138,970 Total Loans $ 3,601,680 $ 1,627,511 $ 1,087,031 $ 556,923 $ 327,336 $ 341,273 $ 7,541,754 The decrease in Special Review Commercial Real Estate – Other Construction and Land development loans at September 30, 2021 compared to December 31, 2020 can be primarily attributed to the payoff of a loan secured by commercial property in the first quarter of 2021. The decrease in Watch List-Doubtful loans in the same category for the same period can be primarily attributed to a relationship secured by commercial property that was placed on non-accrual status

Stock Options

Stock Options	9 Months Ended
Stock Options	Sep. 30, 2021
Stock Options
Stock Options	Note 5 — Stock Options On April 5, 2012, the Board of Directors adopted the 2012 International Bancshares Corporation Stock Option Plan (the “2012 Plan”). There are 800,000 shares of common stock available for stock option grants under the 2012 Plan, which may be 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 . As of September 30, 2021, 21,478 shares were available for future grants under the 2012 Plan. A summary of option activity under the stock option plan for the nine months ended September 30, 2021 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, 2020 651,127 $ 27.24 Plus: Options granted 18,000 37.76 Less: Options exercised 102,275 21.83 Options expired — — Options forfeited 29,376 33.31 Options outstanding at September 30, 2021 537,476 28.29 4.73 $ 7,176 Options fully vested and exercisable at September 30, 2021 342,473 $ 24.58 3.32 $ 5,843 Stock-based compensation expense included in the consolidated statements of income for the three and nine months ended September 30, 2021 was $118,000 and $391,000 , respectively. Stock-based compensation expense included in the consolidated statements of income for the three and nine months ended September 30, 2020 was $176,000 and $571,000 , respectively. As of September 30, 2021, there was approximately $1,023,000 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 1.7 years.

Investment Securities, Equity S

Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments	9 Months Ended
	Sep. 30, 2021
Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments
Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments	Note 6 — Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments We classify debt securities into one of three categories: held-to-maturity, available-for-sale, or trading. Such debt securities are reassessed for appropriate classification at each reporting date. Securities classified as “held-to-maturity” are carried at amortized cost for financial statement reporting, while securities classified as “available-for-sale” and “trading” 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 accumulated other comprehensive income (loss) until realized, or in the case of losses, when deemed other than temporary. In accordance with ASU 2016-13, which we adopted on January 1, 2020, available-for-sale and held-to-maturity debt securities in an unrealized loss position must be 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 September 30, 2021 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 September 30, 2021 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 $ 4,499,169 $ 21,717 $ (11,243) $ 4,509,643 $ 4,509,643 Obligations of states and political subdivisions 41,583 3,088 — 44,671 44,671 Total investment securities $ 4,540,752 $ 24,805 $ (11,243) $ 4,554,314 $ 4,554,314 (1) Included in the carrying value of residential mortgage-backed securities are $873,753 of mortgage-backed securities issued by Ginnie Mae and $3,635,890 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, 2020 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) Residential mortgage-backed securities $ 3,006,592 $ 32,701 $ (9,339) $ 3,029,954 $ 3,029,954 Obligations of states and political subdivisions 47,697 3,131 (14) 50,814 50,814 Total investment securities $ 3,054,289 $ 35,832 $ (9,353) $ 3,080,768 $ 3,080,768 (1) Included in the carrying value of residential mortgage-backed securities are $371,407 of mortgage-backed securities issued by Ginnie Mae and $2,658,547 of mortgage-backed securities issued by Fannie Mae and Freddie. The amortized cost and estimated fair value of investment securities at September 30, 2021, 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 $ 2,200 $ 2,200 $ — $ — Due after one year through five years 1,200 1,200 — — Due after five years through ten years — — — — Due after ten years — — 41,583 44,671 Residential mortgage-backed securities — — 4,499,169 4,509,643 Total investment securities $ 3,400 $ 3,400 $ 4,540,752 $ 4,554,314 Residential mortgage-backed securities are securities primarily issued by the Federal Home Loan Mortgage Corporation (“Freddie Mac”), Federal National Mortgage Association (“Fannie Mae”), or the Government National Mortgage Association (“Ginnie Mae”). 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 early September 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. The amortized cost and fair value of available-for-sale debt investment securities pledged to qualify for fiduciary powers, to secure public monies as required by law, repurchase agreements and short-term fixed borrowings was $1,442,729,000 and $1,442,487,000, respectively, at September 30, 2021. Proceeds from the sale and calls of debt securities available-for-sale were $3,025,000 and $5,890,000 for the three and nine months ended September 30, 2021, respectively, which included $0 and $0 of mortgage-backed securities, respectively. Gross gains of $0 and $0 and gross losses of $12,000 and $16,000 , respectively, were realized on the sales and calls for the three and nine months ended September 30, 2021. Proceeds from the sale and call of debt securities available-for-sale were $9,875,000 and $28,795,000 for the three and nine months ended September 30, 2020, which included $0 and $0 of mortgage-backed securities, respectively. Gross gains of $0 and $0 and gross losses of $0 and $5,000 were realized on the sales and calls for the three and nine months ended September 30, 2020, respectively. Gross unrealized losses on debt investment securities and the fair value of the related securities, aggregated by investment category and length of time that individual debt securities have been in a continuous unrealized loss position at September 30, 2021, 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 $ 2,448,908 $ (10,355) $ 276,364 $ (888) $ 2,725,272 $ (11,243) $ 2,448,908 $ (10,355) $ 276,364 $ (888) $ 2,725,272 $ (11,243) 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, 2020 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 $ 1,462,232 $ (9,339) $ — $ — $ 1,462,232 $ (9,339) Obligations of states and political subdivisions — — 757 (14) 757 (14) $ 1,462,232 $ (9,339) $ 757 $ (14) $ 1,462,989 $ (9,353) 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 will more than likely 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. Equity securities with readily determinable fair values consist primarily of Community Reinvestment Act funds. At September 30, 2021 and December 31, 2020, the balance in equity securities with readily determinable fair values recorded at fair value were $6,132,000 and $6,202,000 , respectively. The following is a summary of unrealized and realized gains and losses recognized in net income on equity securities during the three and nine months ended September 30, 2021 and the three and nine months ended September 30, 2020: Three Months Ended September 30, 2021 (Dollars in Thousands) Net losses recognized during the period on equity securities $ (5) 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 $ (5) Nine Months Ended September 30, 2021 (Dollars in Thousands) Net losses recognized during the period on equity securities $ (70) 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 $ (70) Three Months Ended September 30, 2020 (Dollars in Thousands) Net losses recognized during the period on equity securities $ (12) 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 $ (12) Nine Months Ended September 30, 2020 (Dollars in Thousands) Net gains recognized during the period on equity securities $ 87 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 $ 87 Other investments include equity and merchant banking investments held by our subsidiary banks and non-banking entities. During the second quarter of 2021, one of our non-bank subsidiaries sold an equity interest in a merchant banking investment resulting in a gain on sale included in other investment income on the consolidated statements of income.

Other Borrowed Funds

Other Borrowed Funds	9 Months Ended
Other Borrowed Funds	Sep. 30, 2021
Other Borrowed Funds
Other Borrowed Funds	Note 7 — Other Borrowed Funds Other borrowed funds include FHLB borrowings, which are short-term and long-term borrowings issued by the FHLB of Dallas and the FHLB of Topeka at the market price offered at the time of funding. These borrowings are secured by residential mortgage-backed investment securities and a portion of our loan portfolio. At September 30, 2021, other borrowed funds totaled $436,186,000, a decrease of less than .1% from $436,327,000 at December 31, 2020.

Junior Subordinated Interest De

Junior Subordinated Interest Deferrable Debentures	9 Months Ended
Junior Subordinated Interest Deferrable Debentures	Sep. 30, 2021
Junior Subordinated Interest Deferrable Debentures
Junior Subordinated Interest Deferrable Debentures	Note 8 — Junior Subordinated Interest Deferrable Debentures As of September 30, 2021, we have five statutory business trusts under the laws of the State of Delaware, for the purpose of issuing trust preferred securities. The five statutory business trusts we formed (the “Trusts”) have each issued Capital and Common Securities and invested the proceeds thereof in an equivalent amount of junior subordinated debentures (“Debentures”) that we issued. As of September 30, 2021 and December 31, 2020, the principal amount of Debentures outstanding totaled $134,642,000. The Debentures are subordinated and junior in right of payment to all present and future senior indebtedness (as defined in the respective Indentures) and are pari passu For financial reporting purposes, the Trusts are treated as our investments and not consolidated in our consolidated financial statements. Although the Capital and Common Securities issued by each of the Trusts are not included as a component of shareholders’ equity on the consolidated statement of condition, the Capital and Common Securities are treated as capital for regulatory purposes. Specifically, under applicable regulatory guidelines, the Capital and Common 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 September 30, 2021 and December 31, 2020, the total $ The following table illustrates key information about each of the Capital and Common Securities and their interest rate at September 30, 2021: Junior Subordinated Deferrable Interest Repricing Interest Interest Optional Debentures Frequency Rate Rate Index(1) Maturity Date Redemption Date (1) (Dollars in Thousands) Trust VIII $ 25,774 Quarterly 3.18 % LIBOR + 3.05 October 2033 October 2008 Trust IX 41,238 Quarterly 1.76 % LIBOR + 1.62 October 2036 October 2011 Trust X 21,021 Quarterly 1.78 % LIBOR + 1.65 February 2037 February 2012 Trust XI 25,990 Quarterly 1.76 % LIBOR + 1.62 July 2037 July 2012 Trust XII 20,619 Quarterly 1.57 % LIBOR + 1.45 September 2037 September 2012 $ 134,642 (1) The Capital and Common Securities may be redeemed in whole or in part on any interest payment date after the Optional Redemption Date.

Common Stock and Dividends

Common Stock and Dividends	9 Months Ended
Common Stock and Dividends	Sep. 30, 2021
Common Stock and Dividends
Common Stock and Dividends	Note 9 — Common Stock and Dividends We paid cash dividends of $.60 and $0.55 per share on February 17 and September 3, 2021, respectively, to record holders of our common Stock on February 5 and August 20, 2021, respectively. We paid cash dividends of $.55 per share on April 3 and October 5, 2020, respectively, to record holders of our common stock on April 1 and September 21, 2020, respectively. In April 2009, the Board of Directors re-established a formal stock repurchase program that authorized the repurchase of up to $40 million of common stock within the following 12 months . Annually since then, including on March 2, 2021, the Board of Directors extended the repurchase program to purchase up to $50 million of common stock during the 12-month period commencing on March 17, 2021. Shares of common stock may be purchased from time to time on the open market or through privately negotiated transactions. Shares purchased in this program will be held in treasury for reissue for various corporate purposes, including employee compensation plans. During the third quarter of 2021, the Board of Directors adopted a Rule 10b5-1 trading plan, and intends to adopt additional Rule 10b5-1 trading plans, that will allow us to purchase shares of our common stock during certain trading blackout periods when we ordinarily would not be in the market due to trading restrictions in our insider trading policy. During the term of a Rule 10b5-1 trading plan, purchases of common stock are automatic to the extent the conditions of the plan’s trading instructions are met. Shares purchased under the Rule 10b5-1 trading plan will be held in treasury for reissue for various corporate purposes, including employee stock compensation plans. As of November 1, 2021, a

Commitments and Contingent Liab

Commitments and Contingent Liabilities and Other Tax Matters	9 Months Ended
	Sep. 30, 2021
Commitments, Contingent Liabilities and Other Tax Matters
Commitments, Contingent Liabilities and Other Tax Matters	Note 10 — Commitments and Contingent Liabilities and Other Tax Matters We are involved in various legal proceedings that are in various stages of litigation. We have determined, based on discussions with its 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 financial position or results of operations. However, many of these matters are in various stages of proceedings and further developments could cause management to revise its assessment of these matters.

Capital Ratios

Capital Ratios	9 Months Ended
Capital Ratios	Sep. 30, 2021
Capital Ratios
Capital Ratios	Note 11 — Capital Ratios Banks and bank holding companies are subject to various regulatory capital requirements administered by state and federal banking agencies. Capital adequacy guidelines and, additionally for banks, prompt corrective action regulations, involve quantitative measures of assets, liabilities, and certain off-balance sheet items calculated under regulatory accounting practices. Capital amount and classifications are also subject to qualitative judgements by regulators about components, risk-weighting and other factors. In July 2013, the Federal Deposit Insurance Corporation (“FDIC”) and other regulatory bodies established a new, comprehensive capital framework for U.S. banking organizations, consisting of minimum requirements that increase both the quantity and quality of capital held by banking organizations. The final rules are a result of the implementation of the BASEL III capital reforms and various Dodd-Frank Wall Street Reform and Consumer Protection Act (“Dodd Frank”) related capital provisions. Consistent with the Basel international framework, the rules include a minimum ratio of Common Equity Tier 1 (“CET1”) to risk-weighted assets of 4.5% and a CET1 capital conservation buffer of 2.5% of risk-weighted assets. The capital conservation buffer began phasing-in on January 1, 2016 at .625% and increased each year until January 1, 2019, when we were required to have a 2.5% capital conservation buffer, effectively resulting in a minimum ratio of CET1 capital to risk-weighted assets of at least 7% upon full implementation. The rules also raised the minimum ratio of Tier 1 capital to risk-weighted assets from 4% to 6% and include a minimum leverage ratio of 4% for all banking organizations. Regarding the quality of capital, the rules emphasize CET1 capital and implements strict eligibility criteria for regulatory capital instruments. The rules also improve the methodology for calculating risk-weighted assets to enhance risk sensitivity. The rules were subject to a four-year phase in period for mandatory compliance and we were required to begin to phase in the rules beginning on January 1, 2015. We believe that as of September 30, 2021, we continue to meet all fully phased-in capital adequacy requirements. On November 21, 2017, the OCC, the Federal Reserve 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 pauses 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. On December 7, 2017, the Basel Committee on Banking Supervision unveiled the latest round of its regulatory capital framework, commonly called “Basel IV.” The framework makes changes to the capital framework first introduced as “Basel III” in 2010. The committee targeted 2022-2027 as the timeframe for implementation by regulators in individual countries, including the U.S. federal bank regulatory agencies (after notice and comment). On May 24, 2018, the 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 (“ADC”) 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. We had a CET1 to risk-weighted assets ratio of 19.64% on September 30, 2021 and 19.05 % on December 31, 2020. We had a Tier 1 capital-to-average-total-asset (leverage) ratio of 13.89% and 14.92%, risk-weighted Tier 1 capital ratio of 20.76% and 20.25% and risk-weighted total capital ratio of 21.86% and 21.40 % at September 30, 2021 and December 31, 2020, respectively. Our CET1 capital consists of common stock and related surplus, net of treasury stock, and retained earnings. We and our Subsidiary Banks elected to opt-out of the requirement to include most components of accumulated other comprehensive income (loss) in the calculation of CET1 capital. CET1 is reduced by goodwill and other intangible assets, net of associated deferred tax liabilities and subject to transition provisions. Tier 1 capital includes CET1 capital and additional Tier 1 capital. Additional Tier 1 capital includes the Capital and Common Securities issued by the Trusts (see Note 8 above) up to a maximum of 25 % of Tier 1 capital on an aggregate basis. Any amount that exceeds the 25 % threshold qualifies as Tier 2 capital. As of September 30, 2021, the total of $134,642,000 of the Capital and Common Securities outstanding qualified as Tier 1 capital. We actively monitor the regulatory capital ratios to ensure that our Subsidiary Banks are well-capitalized under the regulatory framework. The CET1, Tier 1 and Total capital ratios are calculated by dividing the respective capital amounts by risk-weighted assets. Risk-weighted assets are calculated based on regulatory requirements and include total assets, excluding goodwill and other intangible assets, allocated by risk-weight category, and certain off-balance-sheet items, among other things. The leverage ratio is calculated by dividing Tier 1 capital by adjusted quarterly average total assets, which exclude goodwill and other intangible assets, among other things. We and our Subsidiary Banks are subject to the regulatory capital requirements administered by the Federal Reserve, and, for our Subsidiary Banks, the FDIC. Regulatory authorities can initiate certain mandatory actions if we or any of our Subsidiary Banks fail to meet the minimum capital requirements, which could have a direct material effect on our financial statements. Management believes, as of September 30, 2021, that we and each of our Subsidiary Banks meet all capital adequacy requirements to which we are subject.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
Fair Value Measurements (Tables)	Sep. 30, 2021
Fair Value Measurements
Assets and liabilities measured at fair value on a recurring basis	The following table represents assets and liabilities reported on the consolidated balance sheets at their fair value on a recurring basis as of September 30, 2021 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 September 30, 2021 (Level 1) (Level 2) (Level 3) Measured on a recurring basis: Assets: Available for sale debt securities Residential mortgage-backed securities $ 4,509,643 $ — $ 4,509,643 $ — States and political subdivisions 44,671 — 44,671 — Equity Securities 6,132 6,132 — — $ 4,560,446 $ 6,132 $ 4,554,314 $ — The following table represents assets and liabilities reported on the consolidated balance sheets at their fair value on a recurring basis as of December 31, 2020 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, 2020 (Level 1) (Level 2) (Level 3) Measured on a recurring basis: Assets: Available for sale securities Residential mortgage - backed securities $ 3,029,954 $ — $ 3,029,954 $ — States and political subdivisions 50,814 — 50,814 — Equity Securities 6,202 6,202 — — $ 3,086,970 $ 6,202 $ 3,080,768 $ —
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 September 30, 2021 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 Provision Period ended Identical Observable Unobservable (Credit) September 30, Assets Inputs Inputs During 2021 (Level 1) (Level 2) (Level 3) Period Measured on a non-recurring basis: Assets: Watch-List doubtful loans $ 57 $ — $ — $ 57 $ 209 Other real estate owned $ 1,685 $ — $ — $ 1,685 $ 2,065 The following table represents financial instruments measured at fair value on a non-recurring basis as of and for the period ended December 31, 2020 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 (Credit) Year ended for Identical Observable Unobservable Provision December 31, Assets Inputs Inputs During 2020 (Level 1) (Level 2) (Level 3) Period Measured on a non-recurring basis: Assets: Watch-List doubtful loans $ 393 $ — $ — $ 393 $ (86) Other real estate owned 6,241 — — 6,241 1,539

Loans (Tables)

Loans (Tables)	9 Months Ended
Loans (Tables)	Sep. 30, 2021
Loans
Summary of loans, by loan type	September 30, December 31, 2021 2020 (Dollars in Thousands) Commercial, financial and agricultural $ 4,680,091 $ 4,516,288 Real estate - mortgage 876,313 999,144 Real estate - construction 1,671,212 1,846,757 Consumer 40,699 40,595 Foreign 135,843 138,970 Total loans $ 7,404,158 $ 7,541,754

Allowance for Credit Losses (Ta

Allowance for Credit Losses (Tables)	9 Months Ended
Allowance for Credit Losses (Tables)	Sep. 30, 2021
Allowance for Credit Losses
Loans individually or collectively evaluated for their impairment and related allowance, by loan class	Three Months Ended September 30, 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 June 30, 2021 $ 23,063 $ 33,603 $ 34,238 $ 4,206 $ 3,916 $ 8,196 $ 268 $ 791 $ 108,281 Losses charged to allowance (2,287) (2) — — (73) (4) (64) — (2,430) Recoveries credited to allowance 473 — 141 — 12 28 19 — 673 Net (losses) recoveries charged to allowance (1,814) (2) 141 — (61) 24 (45) — (1,757) Credit loss expense 1,955 503 871 9 (110) (496) 47 22 2,801 Balance at September 30, 2021 $ 23,204 $ 34,104 $ 35,250 $ 4,215 $ 3,745 $ 7,724 $ 270 $ 813 $ 109,325 Three Months Ended September 30, 2020 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 June 30, 2020 $ 20,079 $ 40,924 $ 18,711 $ 1,864 $ 3,208 $ 8,964 $ 288 $ 516 $ 94,554 Losses charged to allowance (1,735) — — — (87) (3) (62) — (1,887) Recoveries credited to allowance 523 14 86 — 8 51 46 — 728 Net (losses) recoveries charged to allowance (1,212) 14 86 — (79) 48 (16) — (1,159) Credit loss expense 3,277 (2,855) 4,892 2,639 400 293 2 122 8,770 Balance at September 30, 2020 $ 22,144 $ 38,083 $ 23,689 $ 4,503 $ 3,529 $ 9,305 $ 274 $ 638 $ 102,165 Nine Months Ended September 30, 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 (5,835) (2) (356) — (262) (25) (151) — (6,631) Recoveries credited to allowance 1,429 — 160 — 47 86 38 — 1,760 Net (losses) recoveries charged to allowance (4,406) (2) (196) — (215) 61 (113) — (4,871) Credit loss expense 5,702 (3,506) 5,446 (836) 86 (1,907) 92 60 5,137 Balance at September 30, 2021 $ 23,204 $ 34,104 $ 35,250 $ 4,215 $ 3,745 $ 7,724 $ 270 $ 813 $ 109,325 Nine Months Ended September 30, 2020 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, 2019 $ 11,145 $ 18,152 $ 16,533 $ 1,786 $ 3,762 $ 7,535 $ 542 $ 823 $ 60,278 Adoption of ASU 2016-13 4,247 13,391 (4,292) (355) (1,580) (429) (225) (410) 10,347 Losses charged to allowance (6,696) (19) (55) — (123) (124) (192) — (7,209) Recoveries credited to allowance 1,793 15 107 — 10 171 58 — 2,154 Net (losses) recoveries charged to allowance (4,903) (4) 52 — (113) 47 (134) — (5,055) Credit loss expense 11,655 6,544 11,396 3,072 1,460 2,152 91 225 36,595 Balance at September 30, 2020 $ 22,144 $ 38,083 $ 23,689 $ 4,503 $ 3,529 $ 9,305 $ 274 $ 638 $ 102,165 September 30, 2021 Loans Individually Loans Collectively Evaluated For Evaluated For Impairment Impairment Recorded Recorded Investment Allowance Investment Allowance (Dollars in Thousands) Domestic Commercial $ 331 $ 29 $ 1,596,518 $ 23,175 Commercial real estate: other construction & land development 646 70 1,670,566 34,034 Commercial real estate: farmland & commercial 414 — 2,715,663 35,250 Commercial real estate: multifamily 137 — 367,028 4,215 Residential: first lien 89 — 385,544 3,745 Residential: junior lien 33 — 490,647 7,724 Consumer — — 40,699 270 Foreign — — 135,843 813 Total $ 1,650 $ 99 $ 7,402,508 $ 109,226 December 31, 2020 Loans Individually Loans Collectively Evaluated For Evaluated For Impairment Impairment Recorded Recorded Investment Allowance Investment Allowance (Dollars in Thousands) Domestic Commercial $ 1,189 $ 209 $ 1,784,747 $ 21,699 Commercial real estate: other construction & land development 17,496 70 1,829,261 37,542 Commercial real estate: farmland & commercial 439 — 2,288,869 30,000 Commercial real estate: multifamily 134 — 440,910 5,051 Residential: first lien 151 — 404,968 3,874 Residential: junior lien 38 — 593,987 9,570 Consumer — — 40,595 291 Foreign — — 138,970 753 Total $ 19,447 $ 279 $ 7,522,307 $ 108,780
Loans accounted on non-accrual basis, by loan class	September 30, 2021 December 31, 2020 (Dollars in Thousands) Domestic Commercial $ 331 $ 1,189 Commercial real estate: other construction & land development 646 17,496 Commercial real estate: farmland & commercial 414 439 Commercial real estate: multifamily 137 134 Residential: first lien 342 526 Residential: junior lien 33 38 Total non-accrual loans $ 1,903 $ 19,822
Loans accounted for as trouble debt restructuring, by Watch List Doubtful loans	September 30, 2021 December 31, 2020 (Dollars in Thousands) Domestic Residential: first lien $ 1,934 $ 4,078 Residential: junior lien 106 521 Consumer 862 989 Foreign 17 233 Total troubled debt restructuring $ 2,919 $ 5,821
Information regarding the aging of past due loans, by loan class	September 30, 2021 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 $ 5,123 $ 221 $ 89 $ 89 $ 5,433 $ 1,591,416 $ 1,596,849 Commercial real estate: other construction & land development 21,433 188 — — 21,621 1,649,591 1,671,212 Commercial real estate: farmland & commercial 6,535 2,104 185 — 8,824 2,707,253 2,716,077 Commercial real estate: multifamily — — — — — 367,165 367,165 Residential: first lien 2,266 655 4,930 4,735 7,851 377,782 385,633 Residential: junior lien 515 104 1,842 1,842 2,461 488,219 490,680 Consumer 240 70 46 46 356 40,343 40,699 Foreign 1,231 1,482 360 360 3,073 132,770 135,843 Total past due loans $ 37,343 $ 4,824 $ 7,452 $ 7,072 $ 49,619 $ 7,354,539 $ 7,404,158 December 31, 2020 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 $ 1,931 $ 1,109 $ 563 $ 318 $ 3,603 $ 1,782,333 $ 1,785,936 Commercial real estate: other construction & land development 1,059 854 16,587 — 18,500 1,828,257 1,846,757 Commercial real estate: farmland & commercial 2,435 219 186 186 2,840 2,286,468 2,289,308 Commercial real estate: multifamily 126 — — — 126 440,918 441,044 Residential: first lien 2,399 926 6,165 5,890 9,490 395,629 405,119 Residential: junior lien 561 247 1,197 1,197 2,005 592,020 594,025 Consumer 318 71 79 79 468 40,127 40,595 Foreign 478 180 568 568 1,226 137,744 138,970 Total past due loans $ 9,307 $ 3,606 $ 25,345 $ 8,238 $ 38,258 $ 7,503,496 $ 7,541,754
Summary of the loan portfolio by credit quality indicator, by loan class	2021 2020 2019 2018 2017 Prior Total (Dollars in Thousands) Balance at September 30, 2021 Domestic Commercial Pass $ 775,702 $ 398,790 $ 126,858 $ 104,736 $ 67,433 $ 8,398 $ 1,481,917 Special Review 1,517 74,691 139 81 — — 76,428 Watch List - Pass 33,793 — — — — 10 33,803 Watch List - Substandard 3,232 297 781 60 — — 4,370 Watch List - Doubtful 106 134 — — 91 — 331 Total Commercial $ 814,350 $ 473,912 $ 127,778 $ 104,877 $ 67,524 $ 8,408 $ 1,596,849 Commercial real estate: other construction & land development Pass $ 657,381 $ 441,333 $ 413,856 $ 83,925 $ 15,826 $ 3,406 $ 1,615,727 Special Review 31,527 — 211 — — — 31,738 Watch List - Pass — 23,101 — — — — 23,101 Watch List - Doubtful 539 107 — — — — 646 Total Commercial real estate: other construction & land development $ 689,447 $ 464,541 $ 414,067 $ 83,925 $ 15,826 $ 3,406 $ 1,671,212 Commercial real estate: farmland & commercial Pass $ 771,884 $ 699,685 $ 326,176 $ 455,899 $ 197,313 $ 131,756 $ 2,582,713 Special Review 2,849 1,314 910 3,617 63 194 8,947 Watch List - Pass 17,503 44,143 — — 94 1 61,741 Watch List - Substandard 1,304 54,124 4,178 — 2,195 461 62,262 Watch List - Doubtful — 229 185 — — — 414 Total Commercial real estate: farmland & commercial $ 793,540 $ 799,495 $ 331,449 $ 459,516 $ 199,665 $ 132,412 $ 2,716,077 Commercial real estate: multifamily Pass $ 40,569 $ 81,107 $ 98,720 $ 76,109 $ 63,220 $ 7,303 $ 367,028 Watch List - Doubtful — 137 — — — — 137 Total Commercial real estate: multifamily $ 40,569 $ 81,244 $ 98,720 $ 76,109 $ 63,220 $ 7,303 $ 367,165 Residential: first lien Pass $ 85,763 $ 56,687 $ 65,531 $ 51,959 $ 31,709 $ 93,611 $ 385,260 Watch List - Substandard 57 — 103 — 123 1 284 Watch List - Doubtful — 89 — — — — 89 Total Residential: first lien $ 85,820 $ 56,776 $ 65,634 $ 51,959 $ 31,832 $ 93,612 $ 385,633 Residential: junior lien Pass $ 103,570 $ 141,368 $ 71,211 $ 35,364 $ 46,503 $ 92,631 $ 490,647 Watch List- Doubtful — 33 — — — — 33 Total Residential: junior lien $ 103,570 $ 141,401 $ 71,211 $ 35,364 $ 46,503 $ 92,631 $ 490,680 Residential: junior lien Consumer Pass $ 26,613 $ 10,196 $ 1,910 $ 332 $ 67 $ 1,581 $ 40,699 Total Consumer $ 26,613 $ 10,196 $ 1,910 $ 332 $ 67 $ 1,581 $ 40,699 Foreign Pass $ 69,895 $ 37,503 $ 9,082 $ 9,347 $ 5,238 $ 4,778 $ 135,843 Total Foreign $ 69,895 $ 37,503 $ 9,082 $ 9,347 $ 5,238 $ 4,778 $ 135,843 Total Loans $ 2,623,804 $ 2,065,068 $ 1,119,851 $ 821,429 $ 429,875 $ 344,131 $ 7,404,158 2020 2019 2018 2017 2016 Prior Total (Dollars in Thousands) Balance at December 31, 2020 Domestic Commercial Pass $ 1,168,671 $ 240,869 $ 145,670 $ 85,434 $ 13,901 $ 10,000 $ 1,664,545 Special Review 75,638 — — — — — 75,638 Watch List - Pass 39,886 11 — 3 — 17 39,917 Watch List - Substandard 3,360 683 289 — 315 — 4,647 Watch List - Doubtful 777 161 92 159 — — 1,189 Total Commercial $ 1,288,332 $ 241,724 $ 146,051 $ 85,596 $ 14,216 $ 10,017 $ 1,785,936 Commercial Commercial real estate: other construction & land development Pass $ 773,165 $ 576,707 $ 320,308 $ 78,174 $ 10,534 $ 3,343 $ 1,762,231 Special Review 20,828 21,650 — — — — 42,478 Watch List - Pass 23,101 1,451 — — — — 24,552 Watch List - Doubtful 16,702 794 — — — — 17,496 Total Commercial real estate: other construction & land development $ 833,796 $ 600,602 $ 320,308 $ 78,174 $ 10,534 $ 3,343 $ 1,846,757 Commercial real estate: farmland & commercial Pass $ 884,070 $ 373,993 $ 386,268 $ 189,639 $ 202,500 $ 116,729 $ 2,153,199 Special Review 3,041 — 4,758 177 3,218 — 11,194 Watch List - Pass 61,637 942 277 80 — — 62,936 Watch List - Substandard 53,809 4,986 — 2,269 475 1 61,540 Watch List - Doubtful — 202 — — — 237 439 Total Commercial real estate: farmland & commercial $ 1,002,557 $ 380,123 $ 391,303 $ 192,165 $ 206,193 $ 116,967 $ 2,289,308 Commercial real estate: multifamily Pass $ 74,577 $ 208,356 $ 82,818 $ 64,110 $ 6,801 $ 4,248 $ 440,910 Watch List - Doubtful 134 — — — — — 134 Total Commercial real estate: multifamily $ 74,711 $ 208,356 $ 82,818 $ 64,110 $ 6,801 $ 4,248 $ 441,044 Residential: first lien Pass $ 81,004 $ 62,165 $ 72,299 $ 54,593 $ 29,250 $ 105,463 $ 404,774 Watch List - Pass — 14 131 — — — 145 Watch List - Substandard — — — — 49 — 49 Watch List - Doubtful 86 — — — — 65 151 Total Residential: first lien $ 81,090 $ 62,179 $ 72,430 $ 54,593 $ 29,299 $ 105,528 $ 405,119 Residential: junior lien Pass $ 196,308 $ 108,276 $ 61,636 $ 75,056 $ 56,705 $ 94,454 $ 592,435 Special Review 740 — — 812 — — 1,552 Watch List- Doubtful — — 38 — — — 38 Total Residential: junior lien $ 197,048 $ 108,276 $ 61,674 $ 75,868 $ 56,705 $ 94,454 $ 594,025 Consumer Pass $ 30,910 $ 7,159 $ 875 $ 225 $ 55 $ 1,371 $ 40,595 Total Consumer $ 30,910 $ 7,159 $ 875 $ 225 $ 55 $ 1,371 $ 40,595 Foreign Pass $ 93,236 $ 19,092 $ 11,572 $ 6,192 $ 3,533 $ 5,345 $ 138,970 Total Foreign $ 93,236 $ 19,092 $ 11,572 $ 6,192 $ 3,533 $ 5,345 $ 138,970 Total Loans $ 3,601,680 $ 1,627,511 $ 1,087,031 $ 556,923 $ 327,336 $ 341,273 $ 7,541,754

Stock Options (Tables)

Stock Options (Tables)	9 Months Ended
Stock Options (Tables)	Sep. 30, 2021
Stock Options
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, 2020 651,127 $ 27.24 Plus: Options granted 18,000 37.76 Less: Options exercised 102,275 21.83 Options expired — — Options forfeited 29,376 33.31 Options outstanding at September 30, 2021 537,476 28.29 4.73 $ 7,176 Options fully vested and exercisable at September 30, 2021 342,473 $ 24.58 3.32 $ 5,843

Investment Securities, Equity_2

Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments (Tables)	9 Months Ended
	Sep. 30, 2021
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 September 30, 2021 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 $ 4,499,169 $ 21,717 $ (11,243) $ 4,509,643 $ 4,509,643 Obligations of states and political subdivisions 41,583 3,088 — 44,671 44,671 Total investment securities $ 4,540,752 $ 24,805 $ (11,243) $ 4,554,314 $ 4,554,314 (1) Included in the carrying value of residential mortgage-backed securities are $873,753 of mortgage-backed securities issued by Ginnie Mae and $3,635,890 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, 2020 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) Residential mortgage-backed securities $ 3,006,592 $ 32,701 $ (9,339) $ 3,029,954 $ 3,029,954 Obligations of states and political subdivisions 47,697 3,131 (14) 50,814 50,814 Total investment securities $ 3,054,289 $ 35,832 $ (9,353) $ 3,080,768 $ 3,080,768 (1) Included in the carrying value of residential mortgage-backed securities are $371,407 of mortgage-backed securities issued by Ginnie Mae and $2,658,547 of mortgage-backed securities issued by Fannie Mae and Freddie.
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 $ 2,200 $ 2,200 $ — $ — Due after one year through five years 1,200 1,200 — — Due after five years through ten years — — — — Due after ten years — — 41,583 44,671 Residential mortgage-backed securities — — 4,499,169 4,509,643 Total investment securities $ 3,400 $ 3,400 $ 4,540,752 $ 4,554,314
Gross unrealized losses on investment securities and the related fair value	Gross unrealized losses on debt investment securities and the fair value of the related securities, aggregated by investment category and length of time that individual debt securities have been in a continuous unrealized loss position at September 30, 2021, 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 $ 2,448,908 $ (10,355) $ 276,364 $ (888) $ 2,725,272 $ (11,243) $ 2,448,908 $ (10,355) $ 276,364 $ (888) $ 2,725,272 $ (11,243) 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, 2020 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 $ 1,462,232 $ (9,339) $ — $ — $ 1,462,232 $ (9,339) Obligations of states and political subdivisions — — 757 (14) 757 (14) $ 1,462,232 $ (9,339) $ 757 $ (14) $ 1,462,989 $ (9,353)
Summary of unrealized and realized gains and losses recognized in net income on equity securities	Three Months Ended September 30, 2021 (Dollars in Thousands) Net losses recognized during the period on equity securities $ (5) 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 $ (5) Nine Months Ended September 30, 2021 (Dollars in Thousands) Net losses recognized during the period on equity securities $ (70) 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 $ (70) Three Months Ended September 30, 2020 (Dollars in Thousands) Net losses recognized during the period on equity securities $ (12) 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 $ (12) Nine Months Ended September 30, 2020 (Dollars in Thousands) Net gains recognized during the period on equity securities $ 87 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 $ 87

Junior Subordinated Interest _2

Junior Subordinated Interest Deferrable Debentures (Tables)	9 Months Ended
Junior Subordinated Interest Deferrable Debentures (Tables)	Sep. 30, 2021
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 (1) (Dollars in Thousands) Trust VIII $ 25,774 Quarterly 3.18 % LIBOR + 3.05 October 2033 October 2008 Trust IX 41,238 Quarterly 1.76 % LIBOR + 1.62 October 2036 October 2011 Trust X 21,021 Quarterly 1.78 % LIBOR + 1.65 February 2037 February 2012 Trust XI 25,990 Quarterly 1.76 % LIBOR + 1.62 July 2037 July 2012 Trust XII 20,619 Quarterly 1.57 % LIBOR + 1.45 September 2037 September 2012 $ 134,642 (1) The Capital and Common Securities may be redeemed in whole or in part on any interest payment date after the Optional Redemption Date.

Basis of Presentation (Details)

Basis of Presentation (Details) $ in Thousands	Jan. 01, 2020USD ($)	Sep. 30, 2021USD ($)segmentsubsidiary	Dec. 31, 2020USD ($)
Basis of presentation
Number of operating segments \| segment		1
Number of active operating bank subsidiaries \| subsidiary		5
Retained earnings		$ 2,414,183	$ 2,289,626
ASU 2016-13 \| Adjustment
Basis of presentation
Percentage of allowance for loan losses	17.20%
Retained earnings	$ 8,300

Fair Value (Fair Value By Level

Fair Value (Fair Value By Level) (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Assets:
Available for sale debt securities	$ 4,554,314,000	$ 3,080,768,000
Equity Securities	6,132,000	6,202,000
Estimate of Fair Value Measurement [Member] \| Collateralized Mortgage Backed Securities [Member]
Assets:
Available for sale debt securities	4,509,643,000	3,029,954,000
Estimate of Fair Value Measurement [Member] \| US States and Political Subdivisions Debt Securities [Member]
Assets:
Available for sale debt securities	44,671,000	50,814,000
Fair Value, Measurements, Recurring [Member] \| Estimate of Fair Value Measurement [Member]
Assets:
Marketable Securities	4,560,446,000	3,086,970,000
Fair Value, Measurements, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Collateralized Mortgage Backed Securities [Member]
Assets:
Available for sale debt securities	4,509,643,000	3,029,954,000
Fair Value, Measurements, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| US States and Political Subdivisions Debt Securities [Member]
Assets:
Available for sale debt securities	44,671,000	50,814,000
Fair Value, Measurements, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Equity Securities [Member]
Assets:
Equity Securities	6,132,000	6,202,000
Fair Value, Measurements, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets:
Marketable Securities	6,132,000	6,202,000
Fair Value, Measurements, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member] \| Equity Securities [Member]
Assets:
Equity Securities	6,132,000	6,202,000
Fair Value, Measurements, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets:
Marketable Securities	4,554,314,000	3,080,768,000
Fair Value, Measurements, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member] \| Collateralized Mortgage Backed Securities [Member]
Assets:
Available for sale debt securities	4,509,643,000	3,029,954,000
Fair Value, Measurements, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member] \| US States and Political Subdivisions Debt Securities [Member]
Assets:
Available for sale debt securities	$ 44,671,000	$ 50,814,000

Fair Value Measurements (Fair V

Fair Value Measurements (Fair Value Measurement and Assumptions) (Details) - USD ($)	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Dec. 31, 2020
Assets:
Impaired Loans	$ 815,000	$ 815,000	$ 18,361,000
Assumptions used in discounted cash flow model to determine fair value of investments classified within level 3
Charges to allowance for probable loan losses in connection with other real estate owned	2	2	22,000
Adjustment to fair value in connection with other real estate owned	0	2,065,000	1,539,000
Impaired commercial collateral dependent receivables appraisals to determine fair value within immediately preceding twelve months	0	0	16,587,000
Impaired collateral dependent commercial loans with internal evaluation completed within last twelve months	815,000	815,000	1,283,000
Fair Value, Measurements, Nonrecurring [Member]
Assumptions used in discounted cash flow model to determine fair value of investments classified within level 3
Change in net provision, impaired loans	209,000	209,000	(86,000)
Change in net provision, other real estate owned	2,065,000	2,065,000	1,539,000
Fair Value, Measurements, Nonrecurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Assets:
Watch-List doubtful loans	57,000	57,000	393,000
Non-financial assets:
Other real estate owned	1,685,000	1,685,000	6,241,000
Fair Value, Measurements, Nonrecurring [Member] \| Estimate of Fair Value Measurement [Member]
Assets:
Watch-List doubtful loans	57,000	57,000	393,000
Non-financial assets:
Other real estate owned	$ 1,685,000	$ 1,685,000	$ 6,241,000

Fair Value Measurements (Other

Fair Value Measurements (Other Assumptions) (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Deposits
Carrying amount of time deposits	$ 2,186,651,000	$ 2,153,541,000
Fair Value, Inputs, Level 3 [Member]
Loans
Carrying amount of fixed rate performing loans	1,497,535,000	1,812,413,000
Estimated fair value of fixed rate performing loans	1,451,592,000	1,747,257,000
Deposits
Carrying amount of time deposits	2,186,651,000	2,153,541,000
Estimated fair value of time deposits	2,184,386,000	2,148,976,000
Fair Value, Inputs, Level 2 [Member]
Other borrowed funds
Carrying amount of the long-term FHLB borrowings	436,186,000	436,372,000
Estimated fair value of long-term FHLB borrowings	$ 466,315,000	$ 480,475,000

Loans (Details)

Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Summary of loans, by loan type
Total loans	$ 7,404,158	$ 7,541,754
Commercial, financial and agricultural
Summary of loans, by loan type
Total loans	4,680,091	4,516,288
Real estate - mortgage
Summary of loans, by loan type
Total loans	876,313	999,144
Commercial Real Estate Portfolio Segment [Member]
Summary of loans, by loan type
Total loans	1,671,212	1,846,757
Consumer
Summary of loans, by loan type
Total loans	40,699	40,595
Foreign.
Summary of loans, by loan type
Total loans	$ 135,843	$ 138,970

Allowance for Credit Losses (By

Allowance for Credit Losses (By Loan Class) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Allowance for Credit Losses
Balance at the beginning of the period	$ 108,281	$ 94,554	$ 109,059	$ 60,278
Losses charged to allowance	(2,430)	(1,887)	(6,631)	(7,209)
Recoveries credited to allowance	673	728	1,760	2,154
Net (losses) recoveries charged to allowance	(1,757)	(1,159)	(4,871)	(5,055)
Credit loss expense	2,801	8,770	5,137	36,595
Balance at the end of the period	109,325	102,165	109,325	102,165
ASU 2016-13 \| Adjustment
Allowance for Credit Losses
Balance at the end of the period		10,347		10,347
Commercial, financial and agricultural \| Domestic \| Commercial Loan [Member]
Allowance for Credit Losses
Balance at the beginning of the period	23,063	20,079	21,908	11,145
Losses charged to allowance	(2,287)	(1,735)	(5,835)	(6,696)
Recoveries credited to allowance	473	523	1,429	1,793
Net (losses) recoveries charged to allowance	(1,814)	(1,212)	(4,406)	(4,903)
Credit loss expense	1,955	3,277	5,702	11,655
Balance at the end of the period	23,204	22,144	23,204	22,144
Commercial, financial and agricultural \| Domestic \| Commercial Loan [Member] \| ASU 2016-13 \| Adjustment
Allowance for Credit Losses
Balance at the end of the period		4,247		4,247
Commercial, financial and agricultural \| Domestic \| Commercial Real Estate Farmland and Commercial Receivable [Member]
Allowance for Credit Losses
Balance at the beginning of the period	34,238	18,711	30,000	16,533
Losses charged to allowance			(356)	(55)
Recoveries credited to allowance	141	86	160	107
Net (losses) recoveries charged to allowance	141	86	(196)	52
Credit loss expense	871	4,892	5,446	11,396
Balance at the end of the period	35,250	23,689	35,250	23,689
Commercial, financial and agricultural \| Domestic \| Commercial Real Estate Farmland and Commercial Receivable [Member] \| ASU 2016-13 \| Adjustment
Allowance for Credit Losses
Balance at the end of the period		(4,292)		(4,292)
Commercial, financial and agricultural \| Domestic \| Commercial Real Estate Multifamily Receivable [Member]
Allowance for Credit Losses
Balance at the beginning of the period	4,206	1,864	5,051	1,786
Credit loss expense	9	2,639	(836)	3,072
Balance at the end of the period	4,215	4,503	4,215	4,503
Commercial, financial and agricultural \| Domestic \| Commercial Real Estate Multifamily Receivable [Member] \| ASU 2016-13 \| Adjustment
Allowance for Credit Losses
Balance at the end of the period		(355)		(355)
Commercial Real Estate Portfolio Segment [Member] \| Domestic \| Commercial Real Estate: other construction and land development
Allowance for Credit Losses
Balance at the beginning of the period	33,603	40,924	37,612	18,152
Losses charged to allowance	(2)		(2)	(19)
Recoveries credited to allowance		14		15
Net (losses) recoveries charged to allowance	(2)	14	(2)	(4)
Credit loss expense	503	(2,855)	(3,506)	6,544
Balance at the end of the period	34,104	38,083	34,104	38,083
Commercial Real Estate Portfolio Segment [Member] \| Domestic \| Commercial Real Estate: other construction and land development \| ASU 2016-13 \| Adjustment
Allowance for Credit Losses
Balance at the end of the period		13,391		13,391
Real estate - mortgage \| Domestic \| Residential First Mortgage Financing Receivable [Member]
Allowance for Credit Losses
Balance at the beginning of the period	3,916	3,208	3,874	3,762
Losses charged to allowance	(73)	(87)	(262)	(123)
Recoveries credited to allowance	12	8	47	10
Net (losses) recoveries charged to allowance	(61)	(79)	(215)	(113)
Credit loss expense	(110)	400	86	1,460
Balance at the end of the period	3,745	3,529	3,745	3,529
Real estate - mortgage \| Domestic \| Residential First Mortgage Financing Receivable [Member] \| ASU 2016-13 \| Adjustment
Allowance for Credit Losses
Balance at the end of the period		(1,580)		(1,580)
Real estate - mortgage \| Domestic \| Residential Junior Lien
Allowance for Credit Losses
Balance at the beginning of the period	8,196	8,964	9,570	7,535
Losses charged to allowance	(4)	(3)	(25)	(124)
Recoveries credited to allowance	28	51	86	171
Net (losses) recoveries charged to allowance	24	48	61	47
Credit loss expense	(496)	293	(1,907)	2,152
Balance at the end of the period	7,724	9,305	7,724	9,305
Real estate - mortgage \| Domestic \| Residential Junior Lien \| ASU 2016-13 \| Adjustment
Allowance for Credit Losses
Balance at the end of the period		(429)		(429)
Consumer \| Domestic
Allowance for Credit Losses
Balance at the beginning of the period	268	288	291	542
Losses charged to allowance	(64)	(62)	(151)	(192)
Recoveries credited to allowance	19	46	38	58
Net (losses) recoveries charged to allowance	(45)	(16)	(113)	(134)
Credit loss expense	47	2	92	91
Balance at the end of the period	270	274	270	274
Consumer \| Domestic \| ASU 2016-13 \| Adjustment
Allowance for Credit Losses
Balance at the end of the period		(225)		(225)
Foreign. \| Foreign
Allowance for Credit Losses
Balance at the beginning of the period	791	516	753	823
Credit loss expense	22	122	60	225
Balance at the end of the period	$ 813	638	$ 813	638
Foreign. \| Foreign \| ASU 2016-13 \| Adjustment
Allowance for Credit Losses
Balance at the end of the period		$ (410)		$ (410)

Allowance for Credit Losses (Im

Allowance for Credit Losses (Impairment By Loan Class) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans Individually Evaluated for Impairment, Recorded Investment	$ 1,650	$ 19,447
Loans Individually Evaluated for Impairment, Allowance	99	279
Loans Collectively Evaluated for Impairment, Recorded Investment	7,402,508	7,522,307
Loans Collectively Evaluated for Impairment, Allowance	109,226	108,780
Commercial, financial and agricultural \| Domestic \| Commercial Loan [Member]
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans Individually Evaluated for Impairment, Recorded Investment	331	1,189
Loans Individually Evaluated for Impairment, Allowance	29	209
Loans Collectively Evaluated for Impairment, Recorded Investment	1,596,518	1,784,747
Loans Collectively Evaluated for Impairment, Allowance	23,175	21,699
Commercial, financial and agricultural \| Domestic \| Commercial Real Estate Farmland and Commercial Receivable [Member]
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans Individually Evaluated for Impairment, Recorded Investment	414	439
Loans Collectively Evaluated for Impairment, Recorded Investment	2,715,663	2,288,869
Loans Collectively Evaluated for Impairment, Allowance	35,250	30,000
Commercial, financial and agricultural \| Domestic \| Commercial Real Estate Multifamily Receivable [Member]
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans Individually Evaluated for Impairment, Recorded Investment	137	134
Loans Collectively Evaluated for Impairment, Recorded Investment	367,028	440,910
Loans Collectively Evaluated for Impairment, Allowance	4,215	5,051
Commercial Real Estate Portfolio Segment [Member] \| 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	646	17,496
Loans Individually Evaluated for Impairment, Allowance	70	70
Loans Collectively Evaluated for Impairment, Recorded Investment	1,670,566	1,829,261
Loans Collectively Evaluated for Impairment, Allowance	34,034	37,542
Real estate - mortgage \| Domestic \| Residential First Mortgage Financing Receivable [Member]
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans Individually Evaluated for Impairment, Recorded Investment	89	151
Loans Collectively Evaluated for Impairment, Recorded Investment	385,544	404,968
Loans Collectively Evaluated for Impairment, Allowance	3,745	3,874
Real estate - mortgage \| Domestic \| Residential Junior Lien
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans Individually Evaluated for Impairment, Recorded Investment	33	38
Loans Collectively Evaluated for Impairment, Recorded Investment	490,647	593,987
Loans Collectively Evaluated for Impairment, Allowance	7,724	9,570
Consumer \| Domestic
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans Collectively Evaluated for Impairment, Recorded Investment	40,699	40,595
Loans Collectively Evaluated for Impairment, Allowance	270	291
Foreign. \| Foreign
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans Collectively Evaluated for Impairment, Recorded Investment	135,843	138,970
Loans Collectively Evaluated for Impairment, Allowance	$ 813	$ 753

Allowance for Credit Losses (No

Allowance for Credit Losses (Non-accrual Basis By Loan Class) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Loan loss allowances, financing receivable past due
Non-accrual loans, total	$ 1,903	$ 19,822
Commercial, financial and agricultural \| Domestic \| Commercial Loan [Member]
Loan loss allowances, financing receivable past due
Non-accrual loans, total	331	1,189
Commercial, financial and agricultural \| Domestic \| Commercial Real Estate Farmland and Commercial Receivable [Member]
Loan loss allowances, financing receivable past due
Non-accrual loans, total	414	439
Commercial, financial and agricultural \| Domestic \| Commercial Real Estate Multifamily Receivable [Member]
Loan loss allowances, financing receivable past due
Non-accrual loans, total	137	134
Commercial Real Estate Portfolio Segment [Member] \| Domestic \| Commercial Real Estate: other construction and land development
Loan loss allowances, financing receivable past due
Non-accrual loans, total	646	17,496
Real estate - mortgage \| Domestic \| Residential First Mortgage Financing Receivable [Member]
Loan loss allowances, financing receivable past due
Non-accrual loans, total	342	526
Real estate - mortgage \| Domestic \| Residential Junior Lien
Loan loss allowances, financing receivable past due
Non-accrual loans, total	$ 33	$ 38

Allowance for Credit Losses (_2

Allowance for Credit Losses (Impaired Loans) (Details)	9 Months Ended
Allowance for Credit Losses (Impaired Loans) (Details)	Sep. 30, 2021USD ($)	Nov. 01, 2021USD ($)	Aug. 01, 2021USD ($)loan	Dec. 31, 2020USD ($)
Loan loss allowances, impaired financing receivable
Total troubled debt restructuring	$ 2,919,000			$ 5,821,000
Amount of loans with some degree of payment deferral		$ 226,831,000
Period of charge off for past due unsecured commercial loans	90 days
Paycheck protection program loans (COVID-19 program)
Loan loss allowances, impaired financing receivable
Period of time PPP loans cover payroll and certain other costs	168 days
Interest rate on receivable	1.00%
Number of loans \| loan			2,634
Amount of loans outstanding			$ 169,511,000
Paycheck protection program loans (COVID-19 program) \| Loans made prior to June 5, 2020
Loan loss allowances, impaired financing receivable
Term of receivable (in years)	2 years
Paycheck protection program loans (COVID-19 program) \| Loans made after June 5, 2020
Loan loss allowances, impaired financing receivable
Term of receivable (in years)	5 years
Real estate - mortgage \| Domestic \| Residential First Mortgage Financing Receivable [Member]
Loan loss allowances, impaired financing receivable
Total troubled debt restructuring	$ 1,934,000			4,078,000
Real estate - mortgage \| Domestic \| Residential Junior Lien
Loan loss allowances, impaired financing receivable
Total troubled debt restructuring	106,000			521,000
Consumer \| Domestic
Loan loss allowances, impaired financing receivable
Total troubled debt restructuring	862,000			989,000
Foreign. \| Foreign
Loan loss allowances, impaired financing receivable
Total troubled debt restructuring	$ 17,000			$ 233,000

Allowance for Credit Losses (Ag

Allowance for Credit Losses (Aging By Loan Class) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing receivable recorded investment
Past due 90 days or Greater and Still Accruing	$ 7,072	$ 8,238
Loans	7,404,158	7,541,754
Current
Financing receivable recorded investment
Loans	7,354,539	7,503,496
Total Past Due
Financing receivable recorded investment
Loans	49,619	38,258
30 to 59 Days
Financing receivable recorded investment
Loans	37,343	9,307
60 to 89 Days
Financing receivable recorded investment
Loans	4,824	3,606
90 Days or Greater
Financing receivable recorded investment
Loans	7,452	25,345
Commercial, financial and agricultural
Financing receivable recorded investment
Loans	4,680,091	4,516,288
Commercial, financial and agricultural \| Domestic \| Commercial Loan [Member]
Financing receivable recorded investment
Past due 90 days or Greater and Still Accruing	89	318
Loans	1,596,849	1,785,936
Commercial, financial and agricultural \| Domestic \| Commercial Loan [Member] \| Current
Financing receivable recorded investment
Loans	1,591,416	1,782,333
Commercial, financial and agricultural \| Domestic \| Commercial Loan [Member] \| Total Past Due
Financing receivable recorded investment
Loans	5,433	3,603
Commercial, financial and agricultural \| Domestic \| Commercial Loan [Member] \| 30 to 59 Days
Financing receivable recorded investment
Loans	5,123	1,931
Commercial, financial and agricultural \| Domestic \| Commercial Loan [Member] \| 60 to 89 Days
Financing receivable recorded investment
Loans	221	1,109
Commercial, financial and agricultural \| Domestic \| Commercial Loan [Member] \| 90 Days or Greater
Financing receivable recorded investment
Loans	89	563
Commercial, financial and agricultural \| Domestic \| Commercial Real Estate Farmland and Commercial Receivable [Member]
Financing receivable recorded investment
Past due 90 days or Greater and Still Accruing		186
Loans	2,716,077	2,289,308
Commercial, financial and agricultural \| Domestic \| Commercial Real Estate Farmland and Commercial Receivable [Member] \| Current
Financing receivable recorded investment
Loans	2,707,253	2,286,468
Commercial, financial and agricultural \| Domestic \| Commercial Real Estate Farmland and Commercial Receivable [Member] \| Total Past Due
Financing receivable recorded investment
Loans	8,824	2,840
Commercial, financial and agricultural \| Domestic \| Commercial Real Estate Farmland and Commercial Receivable [Member] \| 30 to 59 Days
Financing receivable recorded investment
Loans	6,535	2,435
Commercial, financial and agricultural \| Domestic \| Commercial Real Estate Farmland and Commercial Receivable [Member] \| 60 to 89 Days
Financing receivable recorded investment
Loans	2,104	219
Commercial, financial and agricultural \| Domestic \| Commercial Real Estate Farmland and Commercial Receivable [Member] \| 90 Days or Greater
Financing receivable recorded investment
Loans	185	186
Commercial, financial and agricultural \| Domestic \| Commercial Real Estate Multifamily Receivable [Member]
Financing receivable recorded investment
Loans	367,165	441,044
Commercial, financial and agricultural \| Domestic \| Commercial Real Estate Multifamily Receivable [Member] \| Current
Financing receivable recorded investment
Loans	367,165	440,918
Commercial, financial and agricultural \| Domestic \| Commercial Real Estate Multifamily Receivable [Member] \| Total Past Due
Financing receivable recorded investment
Loans		126
Commercial, financial and agricultural \| Domestic \| Commercial Real Estate Multifamily Receivable [Member] \| 30 to 59 Days
Financing receivable recorded investment
Loans		126
Commercial Real Estate Portfolio Segment [Member]
Financing receivable recorded investment
Loans	1,671,212	1,846,757
Commercial Real Estate Portfolio Segment [Member] \| Domestic \| Commercial Real Estate: other construction and land development
Financing receivable recorded investment
Loans	1,671,212	1,846,757
Commercial Real Estate Portfolio Segment [Member] \| Domestic \| Commercial Real Estate: other construction and land development \| Current
Financing receivable recorded investment
Loans	1,649,591	1,828,257
Commercial Real Estate Portfolio Segment [Member] \| Domestic \| Commercial Real Estate: other construction and land development \| Total Past Due
Financing receivable recorded investment
Loans	21,621	18,500
Commercial Real Estate Portfolio Segment [Member] \| Domestic \| Commercial Real Estate: other construction and land development \| 30 to 59 Days
Financing receivable recorded investment
Loans	21,433	1,059
Commercial Real Estate Portfolio Segment [Member] \| Domestic \| Commercial Real Estate: other construction and land development \| 60 to 89 Days
Financing receivable recorded investment
Loans	188	854
Commercial Real Estate Portfolio Segment [Member] \| Domestic \| Commercial Real Estate: other construction and land development \| 90 Days or Greater
Financing receivable recorded investment
Loans		16,587
Real estate - mortgage
Financing receivable recorded investment
Loans	876,313	999,144
Real estate - mortgage \| Domestic \| Residential First Mortgage Financing Receivable [Member]
Financing receivable recorded investment
Past due 90 days or Greater and Still Accruing	4,735	5,890
Loans	385,633	405,119
Real estate - mortgage \| Domestic \| Residential First Mortgage Financing Receivable [Member] \| Current
Financing receivable recorded investment
Loans	377,782	395,629
Real estate - mortgage \| Domestic \| Residential First Mortgage Financing Receivable [Member] \| Total Past Due
Financing receivable recorded investment
Loans	7,851	9,490
Real estate - mortgage \| Domestic \| Residential First Mortgage Financing Receivable [Member] \| 30 to 59 Days
Financing receivable recorded investment
Loans	2,266	2,399
Real estate - mortgage \| Domestic \| Residential First Mortgage Financing Receivable [Member] \| 60 to 89 Days
Financing receivable recorded investment
Loans	655	926
Real estate - mortgage \| Domestic \| Residential First Mortgage Financing Receivable [Member] \| 90 Days or Greater
Financing receivable recorded investment
Loans	4,930	6,165
Real estate - mortgage \| Domestic \| Residential Junior Lien
Financing receivable recorded investment
Past due 90 days or Greater and Still Accruing	1,842	1,197
Loans	490,680	594,025
Real estate - mortgage \| Domestic \| Residential Junior Lien \| Current
Financing receivable recorded investment
Loans	488,219	592,020
Real estate - mortgage \| Domestic \| Residential Junior Lien \| Total Past Due
Financing receivable recorded investment
Loans	2,461	2,005
Real estate - mortgage \| Domestic \| Residential Junior Lien \| 30 to 59 Days
Financing receivable recorded investment
Loans	515	561
Real estate - mortgage \| Domestic \| Residential Junior Lien \| 60 to 89 Days
Financing receivable recorded investment
Loans	104	247
Real estate - mortgage \| Domestic \| Residential Junior Lien \| 90 Days or Greater
Financing receivable recorded investment
Loans	1,842	1,197
Consumer
Financing receivable recorded investment
Loans	40,699	40,595
Consumer \| Domestic
Financing receivable recorded investment
Past due 90 days or Greater and Still Accruing	46	79
Loans	40,699	40,595
Consumer \| Domestic \| Current
Financing receivable recorded investment
Loans	40,343	40,127
Consumer \| Domestic \| Total Past Due
Financing receivable recorded investment
Loans	356	468
Consumer \| Domestic \| 30 to 59 Days
Financing receivable recorded investment
Loans	240	318
Consumer \| Domestic \| 60 to 89 Days
Financing receivable recorded investment
Loans	70	71
Consumer \| Domestic \| 90 Days or Greater
Financing receivable recorded investment
Loans	46	79
Foreign.
Financing receivable recorded investment
Loans	135,843	138,970
Foreign. \| Foreign
Financing receivable recorded investment
Past due 90 days or Greater and Still Accruing	360	568
Loans	135,843	138,970
Foreign. \| Foreign \| Current
Financing receivable recorded investment
Loans	132,770	137,744
Foreign. \| Foreign \| Total Past Due
Financing receivable recorded investment
Loans	3,073	1,226
Foreign. \| Foreign \| 30 to 59 Days
Financing receivable recorded investment
Loans	1,231	478
Foreign. \| Foreign \| 60 to 89 Days
Financing receivable recorded investment
Loans	1,482	180
Foreign. \| Foreign \| 90 Days or Greater
Financing receivable recorded investment
Loans	$ 360	$ 568

Allowance for Credit Losses (Po

Allowance for Credit Losses (Portfolio Credit Quality) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Loan portfolio by credit quality indicator
2021	$ 2,623,804
2020	2,065,068	$ 3,601,680
2019	1,119,851	1,627,511
2018	821,429	1,087,031
2017	429,875	556,923
2016/Prior	344,131	327,336
Prior		341,273
Total loans	7,404,158	7,541,754
Commercial, financial and agricultural
Loan portfolio by credit quality indicator
Total loans	4,680,091	4,516,288
Commercial, financial and agricultural \| Domestic \| Commercial Loan [Member]
Loan portfolio by credit quality indicator
2021	814,350
2020	473,912	1,288,332
2019	127,778	241,724
2018	104,877	146,051
2017	67,524	85,596
2016/Prior	8,408	14,216
Prior		10,017
Total loans	1,596,849	1,785,936
Commercial, financial and agricultural \| Domestic \| Commercial Loan [Member] \| Pass [Member]
Loan portfolio by credit quality indicator
2021	775,702
2020	398,790	1,168,671
2019	126,858	240,869
2018	104,736	145,670
2017	67,433	85,434
2016/Prior	8,398	13,901
Prior		10,000
Total loans	1,481,917	1,664,545
Commercial, financial and agricultural \| Domestic \| Commercial Loan [Member] \| Special Mention [Member]
Loan portfolio by credit quality indicator
2021	1,517
2020	74,691	75,638
2019	139
2018	81
Total loans	76,428	75,638
Commercial, financial and agricultural \| Domestic \| Commercial Loan [Member] \| Special Pass [Member]
Loan portfolio by credit quality indicator
2021	33,793
2020		39,886
2019		11
2017		3
2016/Prior	10
Prior		17
Total loans	33,803	39,917
Commercial, financial and agricultural \| Domestic \| Commercial Loan [Member] \| Substandard [Member]
Loan portfolio by credit quality indicator
2021	3,232
2020	297	3,360
2019	781	683
2018	60	289
2016/Prior		315
Total loans	4,370	4,647
Commercial, financial and agricultural \| Domestic \| Commercial Loan [Member] \| Watch List - Doubtful
Loan portfolio by credit quality indicator
2021	106
2020	134	777
2019		161
2018		92
2017	91	159
Total loans	331	1,189
Commercial, financial and agricultural \| Domestic \| Commercial Real Estate Farmland and Commercial Receivable [Member]
Loan portfolio by credit quality indicator
2021	793,540
2020	799,495	1,002,557
2019	331,449	380,123
2018	459,516	391,303
2017	199,665	192,165
2016/Prior	132,412	206,193
Prior		116,967
Total loans	2,716,077	2,289,308
Commercial, financial and agricultural \| Domestic \| Commercial Real Estate Farmland and Commercial Receivable [Member] \| Pass [Member]
Loan portfolio by credit quality indicator
2021	771,884
2020	699,685	884,070
2019	326,176	373,993
2018	455,899	386,268
2017	197,313	189,639
2016/Prior	131,756	202,500
Prior		116,729
Total loans	2,582,713	2,153,199
Commercial, financial and agricultural \| Domestic \| Commercial Real Estate Farmland and Commercial Receivable [Member] \| Special Mention [Member]
Loan portfolio by credit quality indicator
2021	2,849
2020	1,314	3,041
2019	910
2018	3,617	4,758
2017	63	177
2016/Prior	194	3,218
Total loans	8,947	11,194
Commercial, financial and agricultural \| Domestic \| Commercial Real Estate Farmland and Commercial Receivable [Member] \| Special Pass [Member]
Loan portfolio by credit quality indicator
2021	17,503
2020	44,143	61,637
2019		942
2018		277
2017	94	80
2016/Prior	1
Total loans	61,741	62,936
Commercial, financial and agricultural \| Domestic \| Commercial Real Estate Farmland and Commercial Receivable [Member] \| Substandard [Member]
Loan portfolio by credit quality indicator
2021	1,304
2020	54,124	53,809
2019	4,178	4,986
2017	2,195	2,269
2016/Prior	461	475
Prior		1
Total loans	62,262	61,540
Commercial, financial and agricultural \| Domestic \| Commercial Real Estate Farmland and Commercial Receivable [Member] \| Watch List - Doubtful
Loan portfolio by credit quality indicator
2020	229
2019	185	202
Prior		237
Total loans	414	439
Commercial, financial and agricultural \| Domestic \| Commercial Real Estate Multifamily Receivable [Member]
Loan portfolio by credit quality indicator
2021	40,569
2020	81,244	74,711
2019	98,720	208,356
2018	76,109	82,818
2017	63,220	64,110
2016/Prior	7,303	6,801
Prior		4,248
Total loans	367,165	441,044
Commercial, financial and agricultural \| Domestic \| Commercial Real Estate Multifamily Receivable [Member] \| Pass [Member]
Loan portfolio by credit quality indicator
2021	40,569
2020	81,107	74,577
2019	98,720	208,356
2018	76,109	82,818
2017	63,220	64,110
2016/Prior	7,303	6,801
Prior		4,248
Total loans	367,028	440,910
Commercial, financial and agricultural \| Domestic \| Commercial Real Estate Multifamily Receivable [Member] \| Watch List - Doubtful
Loan portfolio by credit quality indicator
2020	137	134
Total loans	137	134
Commercial Real Estate Portfolio Segment [Member]
Loan portfolio by credit quality indicator
Total loans	1,671,212	1,846,757
Commercial Real Estate Portfolio Segment [Member] \| Domestic \| Commercial Real Estate: other construction and land development
Loan portfolio by credit quality indicator
2021	689,447
2020	464,541	833,796
2019	414,067	600,602
2018	83,925	320,308
2017	15,826	78,174
2016/Prior	3,406	10,534
Prior		3,343
Total loans	1,671,212	1,846,757
Commercial Real Estate Portfolio Segment [Member] \| Domestic \| Commercial Real Estate: other construction and land development \| Pass [Member]
Loan portfolio by credit quality indicator
2021	657,381
2020	441,333	773,165
2019	413,856	576,707
2018	83,925	320,308
2017	15,826	78,174
2016/Prior	3,406	10,534
Prior		3,343
Total loans	1,615,727	1,762,231
Commercial Real Estate Portfolio Segment [Member] \| Domestic \| Commercial Real Estate: other construction and land development \| Special Mention [Member]
Loan portfolio by credit quality indicator
2021	31,527
2020		20,828
2019	211	21,650
Total loans	31,738	42,478
Commercial Real Estate Portfolio Segment [Member] \| Domestic \| Commercial Real Estate: other construction and land development \| Special Pass [Member]
Loan portfolio by credit quality indicator
2020	23,101	23,101
2019		1,451
Total loans	23,101	24,552
Commercial Real Estate Portfolio Segment [Member] \| Domestic \| Commercial Real Estate: other construction and land development \| Watch List - Doubtful
Loan portfolio by credit quality indicator
2021	539
2020	107	16,702
2019		794
Total loans	646	17,496
Real estate - mortgage
Loan portfolio by credit quality indicator
Total loans	876,313	999,144
Real estate - mortgage \| Domestic \| Residential First Mortgage Financing Receivable [Member]
Loan portfolio by credit quality indicator
2021	85,820
2020	56,776	81,090
2019	65,634	62,179
2018	51,959	72,430
2017	31,832	54,593
2016/Prior	93,612	29,299
Prior		105,528
Total loans	385,633	405,119
Real estate - mortgage \| Domestic \| Residential First Mortgage Financing Receivable [Member] \| Pass [Member]
Loan portfolio by credit quality indicator
2021	85,763
2020	56,687	81,004
2019	65,531	62,165
2018	51,959	72,299
2017	31,709	54,593
2016/Prior	93,611	29,250
Prior		105,463
Total loans	385,260	404,774
Real estate - mortgage \| Domestic \| Residential First Mortgage Financing Receivable [Member] \| Special Pass [Member]
Loan portfolio by credit quality indicator
2019		14
2018		131
Total loans		145
Real estate - mortgage \| Domestic \| Residential First Mortgage Financing Receivable [Member] \| Substandard [Member]
Loan portfolio by credit quality indicator
2021	57
2019	103
2017	123
2016/Prior	1	49
Total loans	284	49
Real estate - mortgage \| Domestic \| Residential First Mortgage Financing Receivable [Member] \| Watch List - Doubtful
Loan portfolio by credit quality indicator
2020	89	86
Prior		65
Total loans	89	151
Real estate - mortgage \| Domestic \| Residential Junior Lien
Loan portfolio by credit quality indicator
2021	103,570
2020	141,401	197,048
2019	71,211	108,276
2018	35,364	61,674
2017	46,503	75,868
2016/Prior	92,631	56,705
Prior		94,454
Total loans	490,680	594,025
Real estate - mortgage \| Domestic \| Residential Junior Lien \| Pass [Member]
Loan portfolio by credit quality indicator
2021	103,570
2020	141,368	196,308
2019	71,211	108,276
2018	35,364	61,636
2017	46,503	75,056
2016/Prior	92,631	56,705
Prior		94,454
Total loans	490,647	592,435
Real estate - mortgage \| Domestic \| Residential Junior Lien \| Special Mention [Member]
Loan portfolio by credit quality indicator
2020		740
2017		812
Total loans		1,552
Real estate - mortgage \| Domestic \| Residential Junior Lien \| Watch List - Doubtful
Loan portfolio by credit quality indicator
2020	33
2018		38
Total loans	33	38
Consumer
Loan portfolio by credit quality indicator
Total loans	40,699	40,595
Consumer \| Domestic
Loan portfolio by credit quality indicator
2021	26,613
2020	10,196	30,910
2019	1,910	7,159
2018	332	875
2017	67	225
2016/Prior	1,581	55
Prior		1,371
Total loans	40,699	40,595
Consumer \| Domestic \| Pass [Member]
Loan portfolio by credit quality indicator
2021	26,613
2020	10,196	30,910
2019	1,910	7,159
2018	332	875
2017	67	225
2016/Prior	1,581	55
Prior		1,371
Total loans	40,699	40,595
Foreign.
Loan portfolio by credit quality indicator
Total loans	135,843	138,970
Foreign. \| Foreign
Loan portfolio by credit quality indicator
2021	69,895
2020	37,503	93,236
2019	9,082	19,092
2018	9,347	11,572
2017	5,238	6,192
2016/Prior	4,778	3,533
Prior		5,345
Total loans	135,843	138,970
Foreign. \| Foreign \| Pass [Member]
Loan portfolio by credit quality indicator
2021	69,895
2020	37,503	93,236
2019	9,082	19,092
2018	9,347	11,572
2017	5,238	6,192
2016/Prior	4,778	3,533
Prior		5,345
Total loans	$ 135,843	$ 138,970

Stock Options (Details)

Stock Options (Details) - USD ($)	3 Months Ended		9 Months Ended
Stock Options (Details) - USD ($)	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Apr. 05, 2012
Employee Stock Option [Member]
Stock option details
Shares available for future grants	21,478		21,478		800,000
Maximum exercisable period for options granted			10 years
Number of options granted (in shares)			18,000
Stock option activity
Options outstanding at the beginning of the period (in shares)			651,127
Plus: Options granted (in shares)			18,000
Less:
Exercise of stock options (in shares)			102,275
Options forfeited (in shares)			29,376
Options outstanding at the end of the period (in shares)	537,476		537,476
Options fully vested and exercisable at the end of the period (in shares)	342,473		342,473
Stock Options, Weighted average exercise price
Options outstanding at the beginning, weighted average exercise price (in dollars per share)			$ 27.24
Plus: Options granted, weighted average exercise price (in dollars per share)			37.76
Less:
Options exercised, weighted average exercise price (in dollars per share)			21.83
Options forfeited, weighted average exercise price (in dollars per share)			33.31
Options outstanding at the end, weighted average exercise price (in dollars per share)	$ 28.29		28.29
Options fully vested and exercisable at the end, weighted average exercise price (in dollars per share)	$ 24.58		$ 24.58
Stock Options, Weighted average remaining contractual term (years)
Options outstanding at the end, weighted average remaining contractual term (years)			4 years 8 months 23 days
Options fully vested and exercisable at the end, weighted average remaining contractual term (years)			3 years 3 months 25 days
Stock Options, Aggregate intrinsic value
Options outstanding at the end, aggregate intrinsic value	$ 7,176,000		$ 7,176,000
Options fully vested and exercisable at the end, aggregate intrinsic value	5,843,000		5,843,000
Stock-based compensation expense	118,000	$ 176,000	391,000	$ 571,000
Stock-based compensation cost, unrecognized, related to non-vested options	$ 1,023,000		$ 1,023,000
Stock-based compensation cost, unrecognized, related to non-vested options, weighted-average period of recognition			1 year 8 months 12 days
Incentive Stock Options to 10 Percent Shareholders [Member]
Stock option details
Maximum exercisable period for options granted			5 years

Investment Securities, Equity_3

Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Held-to-maturity securities
Amortized cost	$ 3,400	$ 3,400
Estimated fair value	3,400	3,400
Carrying Value	3,400	3,400
Available-for-sale securities
Amortized cost	4,540,752	3,054,289
Available for sale debt securities	4,554,314	3,080,768
Total Amortized cost	4,540,752	3,054,289
Total Gross unrealized gains	24,805	35,832
Total Gross unrealized losses	11,243	9,353
Estimate of Fair Value Measurement [Member]
Available-for-sale securities
Available for sale debt securities and equity securities	4,554,314	3,080,768
Reported Value Measurement [Member]
Available-for-sale securities
Available for sale debt securities and equity securities	4,554,314	3,080,768
Collateralized Mortgage Backed Securities [Member]
Available-for-sale securities
Amortized cost	4,499,169	3,006,592
Gross unrealized gains	21,717	32,701
Gross unrealized losses	(11,243)	(9,339)
Collateralized Mortgage Backed Securities [Member] \| Estimate of Fair Value Measurement [Member]
Available-for-sale securities
Available for sale debt securities	4,509,643	3,029,954
Collateralized Mortgage Backed Securities [Member] \| Reported Value Measurement [Member]
Available-for-sale securities
Available for sale debt securities	4,509,643	3,029,954
US Government Corporations and Agencies Securities [Member]
Available-for-sale securities
Available for sale debt securities	873,753	371,407
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Available-for-sale securities
Available for sale debt securities	3,635,890	2,658,547
US States and Political Subdivisions Debt Securities [Member]
Available-for-sale securities
Amortized cost	41,583	47,697
Gross unrealized gains	3,088	3,131
Gross unrealized losses		(14)
US States and Political Subdivisions Debt Securities [Member] \| Estimate of Fair Value Measurement [Member]
Available-for-sale securities
Available for sale debt securities	44,671	50,814
US States and Political Subdivisions Debt Securities [Member] \| Reported Value Measurement [Member]
Available-for-sale securities
Available for sale debt securities	44,671	50,814
Other Debt Obligations [Member]
Held-to-maturity securities
Amortized cost	3,400	3,400
Estimated fair value	3,400	3,400
Carrying Value	$ 3,400	$ 3,400

Investment Securities, Equity_4

Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments (Contractual Maturities and Estimated Fair Values) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Amortized Cost
Due in one year or less, held-to-maturity debt securities amortized cost	$ 2,200,000		$ 2,200,000
Due after one year through five years, held-to-maturity debt securities amortized cost	1,200,000		1,200,000
Amortized cost, held-to-maturity debt securities	3,400,000		3,400,000		$ 3,400,000
Fair Value
Due in one year or less, held-to-maturity debt securities, Estimated fair value	2,200,000		2,200,000
Due after one year through five years, held-to-maturity debt securities, Estimated fair value	1,200,000		1,200,000
Estimated fair value	3,400,000		3,400,000		3,400,000
Available-for-sale debt securities amortized cost disclosures
Due after ten years, available-for-sale debt securities amortized cost	41,583,000		41,583,000
Residential mortgage-backed securities, amortized cost	4,499,169,000		4,499,169,000
Amortized cost, Available-for-sale securities	4,540,752,000		4,540,752,000		3,054,289,000
Available for sale debt securities, Estimated Fair Value Disclosures
Due after ten years, available-for-sale debt securities, Estimated Fair Value	44,671,000		44,671,000
Residential mortgage-backed securities, Estimated Fair Value	4,509,643,000		4,509,643,000
Estimated fair value, Available for sale securities	4,554,314,000		4,554,314,000		$ 3,080,768,000
Available for sale debt securities, Estimated Fair Value Disclosures
Proceeds from sales and calls of available for sale securities	3,025,000	$ 9,875,000	5,890,000	$ 28,795,000
Proceeds from sales of mortgage-backed securities	0	0	0	0
Gross gains realized on sales	0	0	0	0
Gross losses realized on sales	(12,000)	$ 0	(16,000)	$ (5,000)
Collateral Pledged
Available-for-sale debt securities amortized cost disclosures
Amortized cost, Available-for-sale securities	1,442,729,000		1,442,729,000
Available for sale debt securities, Estimated Fair Value Disclosures
Fair value of available for sale investment securities pledged	$ 1,442,487,000		$ 1,442,487,000

Investment Securities, Equity_5

Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments (Unrealized Losses) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Available for sale:
Fair value, less than 12 months	$ 2,448,908	$ 1,462,232
Unrealized losses, less than 12 Months	(10,355)	(9,339)
Fair value, 12 months or more	276,364	757
Unrealized losses, 12 Months or More	(888)	(14)
Fair value, Total	2,725,272	1,462,989
Unrealized losses, Total	(11,243)	(9,353)
Collateralized Mortgage Backed Securities [Member]
Available for sale:
Fair value, less than 12 months	2,448,908	1,462,232
Unrealized losses, less than 12 Months	(10,355)	(9,339)
Fair value, 12 months or more	276,364
Unrealized losses, 12 Months or More	(888)
Fair value, Total	2,725,272	1,462,232
Unrealized losses, Total	$ (11,243)	(9,339)
US States and Political Subdivisions Debt Securities [Member]
Available for sale:
Fair value, 12 months or more		757
Unrealized losses, 12 Months or More		(14)
Fair value, Total		757
Unrealized losses, Total		$ (14)

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 ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments
Equity Securities	$ 6,132,000		$ 6,132,000		$ 6,202,000
Summary of unrealized and realized gains and losses recognized in net income on equity securities
Net gains (losses) recognized during the period on equity securities	(5,000)	$ (12,000)	(70,000)	$ 87,000
Unrealized gain on equity securities with readily determinable fair values	$ (5,000)	$ (12,000)	$ (70,000)	$ 87,000

Other Borrowed Funds (Details)

Other Borrowed Funds (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Federal Home Loan Bank advances
Other borrowed funds	$ 436,186,000	$ 436,327,000
Maximum
Federal Home Loan Bank advances
Percentage of decrease in other borrowed funds	(0.10%)

Junior Subordinated Interest _3

Junior Subordinated Interest Deferrable Debentures (Details)	9 Months Ended
	Sep. 30, 2021USD ($)item	Dec. 31, 2020USD ($)
Junior subordinated interest deferrable debentures, major types of business trusts
Number of statutory business trusts issuing trust preferred securities \| item	5
Junior subordinated deferrable interest debentures	$ 134,642,000	$ 134,642,000
Maximum number of consecutive quarterly period available for deferral of interest payment on Trusts VIII, IX, X, XI and XII \| item	20
Percentage of capital securities issued by trust qualifying as Tier I capital, maximum	25.00%
Percentage of capital securities issued by trust qualifying as Tier II capital, minimum	25.00%
Capital securities issued by the trust, qualifying as Tier I capital	$ 134,642,000	$ 134,642,000
Trust XI
Junior subordinated interest deferrable debentures, major types of business trusts
Junior subordinated deferrable interest debentures	25,990,000
Trust X
Junior subordinated interest deferrable debentures, major types of business trusts
Junior subordinated deferrable interest debentures	$ 21,021,000

Junior Subordinated Interest _4

Junior Subordinated Interest Deferrable Debentures (Key Information) (Details) - USD ($)	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Junior subordinated interest deferrable debentures, major types of business trusts
Junior subordinated deferrable interest debentures	$ 134,642,000	$ 134,642,000
Trust VIII
Junior subordinated interest deferrable debentures, major types of business trusts
Junior subordinated deferrable interest debentures	$ 25,774,000
Interest rate (as a percent)	3.18%
Interest rate index	LIBOR
Spread on interest rate index (as a percent)	3.05%
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)	1.76%
Interest rate index	LIBOR
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)	1.78%
Interest rate index	LIBOR
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)	1.76%
Interest rate index	LIBOR
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)	1.57%
Interest rate index	LIBOR
Spread on interest rate index (as a percent)	1.45%

Common Stock and Dividends (Det

Common Stock and Dividends (Details) - USD ($)	Sep. 03, 2021	Mar. 02, 2021	Feb. 17, 2021	Oct. 05, 2020	Apr. 03, 2020	Apr. 30, 2009	Nov. 01, 2021
Common Stock and Dividends
Cash dividends paid to common shareholders (in dollars per share)	$ 0.55		$ 0.60	$ 0.55	$ 0.55
Repurchase of common stock, authorized amount		$ 50,000,000				$ 40,000,000
Period of repurchase of common stock		12 months				12 months
Cumulative number of shares repurchased under all stock repurchase programs							12,285,114
Cumulative cost of shares repurchased under all stock repurchase programs							$ 357,759,000

Capital Ratios (Capital Amounts

Capital Ratios (Capital Amounts and Ratios) (Details)	9 Months Ended
Capital Ratios (Capital Amounts and Ratios) (Details)	Sep. 30, 2021USD ($)	Dec. 31, 2020USD ($)
Capital Ratios
CET 1 ratio	19.64	19.05
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent)	21.86	21.40
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent)	20.76	20.25
Tier 1 capital (to Average Assets), Actual Ratio (as a percent)	13.89	14.92
Percentage of capital securities issued by trust qualifying as Tier I capital, maximum	25.00%
Percentage of capital securities issued by trust qualifying as Tier II capital, minimum	25.00%
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust	$ 134,642,000	$ 134,642,000