International Bancshares (IBOC) 10-K 27 Feb 19 2018 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2018	Feb. 25, 2019	Jun. 30, 2018
Document and Entity Information
Entity Registrant Name	INTERNATIONAL BANCSHARES CORP
Entity Central Index Key	315,709
Document Type	10-K
Document Period End Date	Dec. 31, 2018
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 2,830,143,000
Entity Common Stock, Shares Outstanding		65,617,505
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	FY
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false

Consolidated Statements of Cond

Consolidated Statements of Condition - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Assets
Cash and cash equivalents	$ 316,797,000	$ 265,357,000
Investment securities:
Held to maturity debt securities (Market value of $1,200 on December 31, 2018 and $2,400 on December 31, 2017)	1,200,000	2,400,000
Available for sale debt securities (Amortized cost of $3,481,166 on December 31, 2018 and $4,196,263 on December 31, 2017)	3,411,350,000	4,124,184,000
Equity securities with readily determinable fair values	5,937,000	27,886,000
Total investment securities	3,418,487,000	4,154,470,000
Loans	6,561,289,000	6,348,172,000
Less allowance for probable loan losses	(61,384,000)	(67,687,000)
Net loans	6,499,905,000	6,280,485,000
Bank premises and equipment, net	506,899,000	514,454,000
Accrued interest receivable	36,803,000	34,456,000
Other investments	337,507,000	293,990,000
Cash surrender value of bank owned life insurance	282,646,000	277,425,000
Goodwill	282,532,000	282,532,000
Other assets	190,376,000	81,529,000
Total assets	11,871,952,000	12,184,698,000
Deposits:
Demand - non-interest bearing	3,454,840,000	3,243,255,000
Savings and interest bearing demand	3,268,237,000	3,245,131,000
Time	1,973,468,000	2,056,506,000
Total deposits	8,696,545,000	8,544,892,000
Securities sold under repurchase agreements	229,989,000	353,805,000
Other borrowed funds	705,665,000	1,195,225,000
Junior subordinated deferrable interest debentures	160,416,000	160,416,000
Other liabilities	139,755,000	91,380,000
Total liabilities	9,932,370,000	10,345,718,000
Shareholders' equity:
Common shares of $1.00 par value. Authorized 275,000,000 shares; issued 96,104,029 shares on December 31, 2018 and 96,019,028 shares on December 31, 2017	96,104,000	96,019,000
Surplus	145,283,000	171,816,000
Retained earnings	2,064,134,000	1,891,805,000
Accumulated other comprehensive loss	(54,634,000)	(28,397,000)
Total shareholders' equity before treasury stock	2,250,887,000	2,131,243,000
Less cost of shares in treasury, 30,494,143 shares on December 31, 2018 and 29,939,545 on December 31, 2017	(311,305,000)	(292,263,000)
Total shareholders' equity	1,939,582,000	1,838,980,000
Total liabilities and shareholders' equity	$ 11,871,952,000	$ 12,184,698,000

Consolidated Statements of Co_2

Consolidated Statements of Condition (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Consolidated Statements of Condition
Held to maturity, Fair value (in dollars)	$ 1,200	$ 2,400
Available for sale, Amortized cost (in dollars)	$ 3,481,165	$ 4,196,263
Common shares, par value (in dollars per share)	$ 1	$ 1
Common shares, Authorized shares	275,000,000	275,000,000
Common shares, issued shares	96,104,029	96,019,028
Treasury, shares	30,494,143	29,939,545

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest income:
Loans, including fees	$ 375,173	$ 322,508	$ 297,820
Investment securities:
Taxable	81,484	82,347	79,533
Tax-exempt	8,141	9,656	10,356
Other interest income	1,024	625	205
Total interest income	465,822	415,136	387,914
Interest expense:
Savings deposits	12,764	6,208	4,562
Time deposits	13,096	9,736	9,963
Securities sold under repurchase agreements	2,415	6,617	20,876
Other borrowings	17,404	10,978	3,128
Junior subordinated deferrable interest debentures	6,989	5,392	4,600
Total interest expense	52,668	38,931	43,129
Net interest income	413,154	376,205	344,785
Provision for probable loan losses	6,112	11,221	19,859
Net interest income after provision for probable loan losses	407,042	364,984	324,926
Non-interest income:
Investment securities transactions, net	(141)	(4,774)	(2,626)
Other investments, net	19,897	18,918	23,827
Other income	18,367	11,085	13,647
Total non-interest income	165,042	150,406	161,702
Non-interest expense:
Employee compensation and benefits	138,532	132,750	128,661
Occupancy	29,097	28,439	26,583
Depreciation of bank premises and equipment	25,873	25,281	24,738
Professional fees	12,601	13,650	13,672
Deposit insurance assessments	3,742	3,294	5,777
Net expense, other real estate owned	4,413	965	5,688
Amortization of identified intangible assets		25	128
Advertising	7,695	7,854	7,814
Early termination fee - securities sold under repurchase agreements		5,765	7,042
Software and software maintenance	17,516	19,189	15,087
Impairment charges (Total other-than-temporary impairment charges, $0 net of $0, $0 net of $0, and $793 net of $1,147 included in other comprehensive loss)			354
Other	60,032	56,536	54,081
Total non-interest expense	299,501	293,748	289,625
Income before income taxes	272,583	221,642	197,003
Provision for income taxes	56,652	64,206	63,071
Net income	$ 215,931	$ 157,436	$ 133,932
Basic earnings per common share:
Weighted average number of shares outstanding (in shares)	66,106,580	66,046,155	65,967,989
Net income (in dollars per share)	$ 3.27	$ 2.38	$ 2.03
Fully diluted earnings per common share:
Weighted average number of shares outstanding (in shares)	66,633,820	66,778,436	66,313,490
Net income (in dollars per share)	$ 3.24	$ 2.36	$ 2.02
Services charges on deposit accounts
Non-interest income:
Service charges	$ 72,433	$ 72,868	$ 73,581
Other service charges, commissions and fees, Banking
Non-interest income:
Service charges	46,685	44,964	46,267
Other service charges, commissions and fees, Non-banking
Non-interest income:
Service charges	$ 7,801	$ 7,345	$ 7,006

Consolidated Statements of In_2

Consolidated Statements of Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Consolidated Statements of Income
Impairment charges, other-than-temporary impairment charges	$ 0	$ 0	$ 793
Impairment charges, other comprehensive income	$ 0	$ 0	$ 1,147

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Consolidated Statements of Comprehensive Income
Net income	$ 215,931	$ 157,436	$ 133,932
Other comprehensive income (loss), net of tax:
Net unrealized holding losses on securities available for sale arising during period (net of tax effects of $(7,004), $(2,586), and $(16,585))	(26,348)	(4,803)	(30,801)
Reclassification adjustment for losses on securities available for sale included in net income (net of tax effects of $30, $1,671, and $919)	111	3,103	1,707
Reclassification adjustment for impairment charges on available for sale securities included in net income (net of tax effects of $0, $0, and $124)			230
Other comprehensive income, net of tax	(26,237)	(1,700)	(28,864)
Comprehensive income	$ 189,694	$ 155,736	$ 105,068

Consolidated Statements of Co_3

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Consolidated Statements of Comprehensive Income
Net unrealized holding gains (losses) on securities available for sale arising during period, tax effects	$ (7,004)	$ (2,586)	$ (16,585)
Reclassification adjustment for losses on securities available for sale included in net income, tax effects	30	1,671	919
Reclassification adjustment for impairment charges on available for sale securities included in net income, tax effects	$ 0	$ 0	$ 124

Consolidated Statements of Shar

Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Preferred Stock	Common Stock	Surplus	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Total
Balance at Dec. 31, 2015		$ 95,866	$ 167,980	$ 1,683,600	$ 2,167	$ (284,110)	$ 1,665,503
Balance (in shares) at Dec. 31, 2015	95,866
Increase (decrease) in shareholders' equity
Net Income				133,932			133,932
Dividends:
Cash ($.75, $.66 and $.60 per share) for the year ended December 31, 2018, 2017 and 2016, respectively)				(39,569)			(39,569)
Purchase of treasury stock (554,598, 4,870 and 349,029 shares) for the years ended December 31, 2018, 2017 and 2016, respectively)						(7,966)	(7,966)
Exercise of stock options		44	505				549
Options exercised (in shares)	44
Stock compensation expense recognized in earnings			1,082				1,082
Other comprehensive income (loss), net of tax:
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments					(28,864)		(28,864)
Balance at Dec. 31, 2016		95,910	169,567	1,777,963	(26,697)	(292,076)	1,724,667
Balance (in shares) at Dec. 31, 2016	95,910
Increase (decrease) in shareholders' equity
Net Income				157,436			157,436
Dividends:
Cash ($.75, $.66 and $.60 per share) for the year ended December 31, 2018, 2017 and 2016, respectively)				(43,594)			(43,594)
Purchase of treasury stock (554,598, 4,870 and 349,029 shares) for the years ended December 31, 2018, 2017 and 2016, respectively)						(187)	(187)
Exercise of stock options		109	1,346				1,455
Options exercised (in shares)	109
Stock compensation expense recognized in earnings			903				903
Other comprehensive income (loss), net of tax:
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments					(1,700)		(1,700)
Balance at Dec. 31, 2017		96,019	171,816	1,891,805	(28,397)	(292,263)	1,838,980
Balance (in shares) at Dec. 31, 2017	96,019
Dividends:
Cumulative adjustment for adoption of new accounting standards				5,997	(5,997)
Net Income				215,931			215,931
Cash ($.75, $.66 and $.60 per share) for the year ended December 31, 2018, 2017 and 2016, respectively)				(49,599)			(49,599)
Purchase of treasury stock (554,598, 4,870 and 349,029 shares) for the years ended December 31, 2018, 2017 and 2016, respectively)						(19,042)	(19,042)
Exercise of stock options		85	1,437				1,522
Options exercised (in shares)	85
Stock compensation expense recognized in earnings			1,035				1,035
Repurchase of outstanding warrant			(29,005)				(29,005)
Other comprehensive income (loss), net of tax:
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments					(20,240)		(20,240)
Balance at Dec. 31, 2018		$ 96,104	$ 145,283	$ 2,064,134	$ (54,634)	$ (311,305)	$ 1,939,582
Balance (in shares) at Dec. 31, 2018	96,104

Consolidated Statements of Sh_2

Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Consolidated Statements of Shareholders' Equity
Cash Dividends (in dollars per share)	$ 0.75	$ 0.66	$ 0.60
Purchase of treasury stock (in shares)	554,598	4,870	349,029

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating activities:
Net income	$ 215,931,000	$ 157,436,000	$ 133,932,000
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for probable loan losses	6,112,000	11,221,000	19,859,000
Specific reserve, other real estate owned	3,071,000	710,000	2,351,000
Depreciation of bank premises and equipment	25,873,000	25,281,000	24,738,000
Gain on sale of bank premises and equipment	(1,456,000)	(38,000)	(450,000)
Gain (loss) on sale of other real estate owned	(1,465,000)	(703,000)	86,000
Accretion of investment securities discounts	(271,000)	(393,000)	(539,000)
Amortization of investment securities premiums	20,087,000	24,040,000	26,873,000
Investment securities transactions, net	141,000	4,774,000	2,626,000
Impairment charges on available for sale securities			354,000
Unrealized loss on equity securities with readily determinable fair values	388,000
Amortization of identified intangible assets		25,000	128,000
Stock based compensation expense	1,035,000	903,000	1,082,000
Earnings from affiliates and other investments	(15,484,000)	(13,198,000)	(14,315,000)
Deferred tax expense	5,143,000	4,570,000	7,306,000
Increase in accrued interest receivable	(2,347,000)	(2,284,000)	(600,000)
(Increase) decrease in other assets	(51,827,000)	(16,117,000)	7,494,000
Net increase (decrease) in other liabilities	24,916,000	592,000	(7,705,000)
Net cash provided by operating activities	229,847,000	196,819,000	203,220,000
Investing activities:
Proceeds from maturities of securities	2,275,000		1,200,000
Proceeds from sales and calls of available for sale securities	38,175,000	396,066,000	352,743,000
Proceeds from sales of equity securities with readily determinable fair values	21,607,000
Purchases of available for sale securities	(47,346,000)	(1,182,006,000)	(1,325,657,000)
Principal collected on mortgage backed securities	675,304,000	780,097,000	919,594,000
Net increase in loans	(258,142,000)	(394,267,000)	(38,523,000)
Purchases of other investments	(43,418,000)	(26,193,000)	(49,013,000)
Distributions from other investments	3,668,000	20,344,000	23,276,000
Purchases of bank premises and equipment	(21,395,000)	(14,315,000)	(38,856,000)
Proceeds from sales of bank premises and equipment	4,533,000	2,201,000	3,701,000
Proceeds from sales of other real estate owned	4,179,000	14,266,000	13,772,000
Net cash provided by (used in) investing activities	379,440,000	(403,807,000)	(137,763,000)
Financing activities:
Net increase in non-interest bearing demand deposits	211,585,000	85,204,000	8,433,000
Net increase in savings and interest bearing demand deposits	23,106,000	41,403,000	183,506,000
Net decrease in time deposits	(83,038,000)	(191,804,000)	(118,103,000)
Net decrease in securities sold under repurchase agreements	(123,816,000)	(151,180,000)	(322,787,000)
Net (decrease) increase in other borrowed funds	(489,560,000)	461,850,000	227,625,000
Redemption of long-term debt			(1,000,000)
Repurchase of outstanding common stock warrant	(29,005,000)
Purchase of treasury stock	(19,042,000)	(187,000)	(7,966,000)
Proceeds from stock transactions	1,522,000	1,455,000	549,000
Payments of cash dividends - common	(49,599,000)	(43,594,000)	(39,569,000)
Net cash (used in) provided by financing activities	(557,847,000)	203,147,000	(69,312,000)
Increase (decrease) in cash and cash equivalents	51,440,000	(3,841,000)	(3,855,000)
Cash and cash equivalents at beginning of period	265,357,000	269,198,000	273,053,000
Cash and cash equivalents at end of period	316,797,000	265,357,000	269,198,000
Supplemental cash flow information:
Interest paid	50,623,000	38,995,000	44,069,000
Income taxes paid	40,565,000	66,983,000	49,925,000
Non-cash investing and financing activities:
Net transfers from loans to other real estate owned	$ 32,610,000	$ 2,588,000	$ 2,563,000

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2018
Summary of Significant Accounting Policies
Summary of Significant Accounting Policies	(1) Summary of Significant Accounting Policies Our accounting and reporting policies conform to U.S. generally accepted accounting principles (“GAAP”) and to general practices within the banking industry. The following is a description of the more significant of those policies. Consolidation and Basis of Presentation Our consolidated financial statements include the accounts of the International Bancshares Corporation, its wholly-owned Subsidiary Banks and its wholly-owned non-bank subsidiaries, IBC Subsidiary Corporation, IBC Trading Company, Premier Tierra Holdings, Inc., IBC Charitable and Community Development Corporation, and IBC Capital Corporation. All significant inter-company balances and transactions have been eliminated in consolidation. We, through our Subsidiary Banks, are primarily engaged in the business of banking, including the acceptance of checking and savings deposits and the making of commercial, real estate, personal, home improvement, automobile and other installment and term loans. Our primary markets are north, south, central, and southeast Texas and the state of Oklahoma. Each of our Subsidiary Banks is very active in facilitating international trade along the United States border with Mexico and elsewhere. Although our loan portfolio is diversified, the ability of our debtors to honor their contracts is primarily dependent upon the economic conditions in our trade area. In addition, the investment portfolio is directly impacted by fluctuations in market interest rates. We are subject to the regulations of certain federal agencies as well as the Texas Department of Banking and the Oklahoma Department of Banking and undergo periodic examinations by those regulatory authorities. Such agencies may require certain standards or impose certain limitations based on their judgments or changes in law and regulations. We own one insurance‑related subsidiary, IBC Insurance Agency, Inc., a wholly owned subsidiary of our Subsidiary Bank, International Bank of Commerce, Laredo. The insurance‑related subsidiary does not conduct underwriting activities. The preparation of the consolidated financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the dates of the statement of condition and income and expenses for the periods. Actual results could differ significantly from those estimates. Material estimates that are particularly susceptible to significant changes in the near‑term relate to the determination of the allowance for probable loan losses. Subsequent Events We have evaluated all events or transactions that occurred through the date we issued these financial statements. During this period, we did not have any material recognizable or non‑recognizable subsequent events. Investment Securities We classify debt securities into one of these categories: held‑to‑maturity, available‑for‑sale, or trading. Such classifications are reassessed for appropriate classification at each reporting date. Securities that are intended and expected to be held until maturity are classified as “held‑to‑maturity” and are carried at amortized cost for financial statement reporting. Securities that are not positively expected to be held until maturity, but are intended to be held for an indefinite period of time are classified as “available‑for‑sale” or “trading” and are carried at their fair value. Unrealized holding gains and losses are included in net income for those securities classified as “trading”, while unrealized holding gains and losses related to those securities classified as “available‑for‑sale” are excluded from net income and reported net of tax as other comprehensive income and in shareholders’ equity as accumulated other comprehensive income (loss) until realized. We did not maintain any trading securities during the three-year period ended December 31, 2018. Mortgage‑backed securities held at December 31, 2018 and 2017 represent participating interests in pools of long‑term first mortgage loans originated and serviced by the issuers of the securities. Mortgage‑backed securities are either issued or guaranteed by the U.S. government or its agencies including the Federal Home Loan Mortgage Corporation (“Freddie Mac”), the Federal National Mortgage Association (“Fannie Mae”), the Government National Mortgage Association (“Ginnie Mae”) or other non‑government entities. Investments in residential mortgage‑backed securities issued by Ginnie Mae are fully guaranteed by the U. S. government. Investments in residential mortgage‑backed securities issued by Freddie Mac and Fannie Mae are not fully guaranteed by the U.S. government; however, we believe that the quality of the bonds is similar to other AAA rated bonds with limited credit risk, particularly given the placement of Fannie Mae and Freddie Mac into conservatorship by the federal government in 2008 and because securities issued by others that are collateralized by residential mortgage‑backed securities issued by Fannie Mae or Freddie Mac are rated consistently as AAA rated securities. Market interest rate fluctuations can affect the prepayment speed of principal and the yield on the security. Premiums and discounts are amortized using the level yield or “interest method” over the terms of the securities. Declines in the fair value of held‑to‑maturity and available‑for sale‑securities below their cost that are deemed to be other than temporary are reflected in earnings as realized losses. In determining whether other‑than‑temporary impairment exists, management considers many factors, including (i) the length of time and the extent to which the fair value has been less than cost, (ii) the financial condition and near‑term prospects of the issuer, and (iii) our intent to hold and our determination of whether we will more likely than not be required to sell the security prior to a recovery in fair value. If we determine that (i) we intend to sell the security or (ii) it is more likely than not that we will be required to sell the security before it’s anticipated recovery, the other‑than‑temporary impairment that is recognized in earnings is equal to the difference between the fair value of the security and our amortized cost of the security. If we determine that we (i) do not intend to sell the security and (ii) we will not be more likely than not required to sell the security before it’s anticipated recovery, the other‑than‑temporary impairment is segregated into its two components (i) the amount of impairment related to credit loss and (ii) the amount of impairment related to other factors. The difference between the present value of the cash flows expected to be collected and the amortized cost is the credit loss recognized through earnings and an adjustment to the cost basis of the security. The amount of impairment related to other factors is included in other comprehensive income (loss). Gains and losses on the sale of securities are recorded on the trade date and are determined using the specific identification method. Equity Securities Prior to January 1, 2018, equity securities with readily determinable fair values were included in available-for-sale securities, with the unrealized gain or loss recorded as a component of other comprehensive income (loss). Pursuant to the adoption of ASU 2016-02, equity securities with readily determinable fair values are a separate component of our balance sheet, with unrealized gains and losses recognized in net income. Equity securities with readily determinable fair values at December 31, 2018 and December 31, 2017 consist primarily of Community Reinvestment Act funds. Provision and Allowance for Probable Loan Losses The allowance for probable loan losses is maintained at a level considered adequate by management to provide for probable loan losses. The allowance is increased by provisions charged to operating expense and reduced by net charge‑offs. The provision for probable loan losses is the amount, which, in the judgment of management, is necessary to establish the allowance for probable loan losses at a level that is adequate to absorb known and inherent risks in the loan portfolio. Management believes that the allowance for probable loan losses is adequate. While management uses available information to recognize losses on loans, future additions to the allowance may be necessary based on changes in economic conditions. In addition, various regulatory agencies, as an integral part of their examination process, periodically review our Subsidiary Banks’ allowances for probable loan losses. Such agencies may require our Subsidiary Banks to make additions or reductions to their GAAP allowances based on their judgments of information available to them at the time of their examination. The Subsidiary Banks charge-off that portion of any loan which management considers to represent a loss as well as that portion of any other loan which is classified as a “loss” by bank examiners. Commercial, financial and agricultural or real estate loans are generally considered by management to represent a loss, in whole or part, (i) when an exposure beyond any collateral coverage is apparent, (ii) when no further collection of the portion of the loan so exposed is anticipated based on actual results, (iii) when the credit enhancements, if any, are not adequate, and (iv) when the borrower’s financial condition would indicate so. Generally, unsecured consumer loans are charged-off when 90 days past due. Loans Loans are reported at the principal balance outstanding, net of unearned discounts. Interest income on loans is reported on an accrual basis. Loan fees and costs associated with originating the loans are accreted or amortized over the life of the loan using the interest method. We originate mortgage loans that may subsequently be sold to an unaffiliated third party. The loans are not securitized and if sold, are sold without recourse. Loans held for sale are carried at cost and the principal amount outstanding is not significant to the consolidated financial statements. Impaired Loans Impaired loans are those loans where it is probable that all amounts due according to contractual terms of the loan agreement will not be collected. Impaired loans are measured based on (1) the present value of expected future cash flows discounted at the loan’s effective interest rate; (2) the loan’s observable market price; or (3) the fair value of the collateral if the loan is collateral dependent. Substantially all our impaired loans are measured at the fair value of the collateral. In limited cases, we may use other methods to determine the level of impairment of a loan if such loan is not collateral dependent. Troubled Debt Restructured Loans Troubled debt restructured loans (“TDR”) are those loans where, for reasons related to a borrower’s difficulty to repay a loan, we grant a concession to the borrower that we would not normally consider in the normal course of business. The original terms of the loan are modified or restructured. The terms that may be modified include a reduction in the original stated interest rate, an extension of the original maturity of the loan, a renewal of the loan at an interest rate below current market rates, a reduction in the principal amount of debt outstanding, a reduction in accrued interest or deferral of interest payments. A loan classified as a TDR is classified as an impaired loan and included in the impaired loan totals. A TDR loan may be returned to accrual status when the loan is brought current, has performed in accordance with the restructured terms for a reasonable period of time, is at the current market rate, and the ultimate collectability of the outstanding principal and interest is no longer questionable, however, although those loans may be placed back on accrual status, they will continue to be classified as impaired. Consistent with regulatory guidance, a TDR loan that is subsequently modified, but has shown sustained performance and classification as a TDR, will be removed from TDR status provided that the modified terms were market-based at the time of modification. Non‑Accrual Loans The non‑accrual loan policy of our Subsidiary Banks is to discontinue the accrual of interest on loans when management determines that it is probable that future interest accruals will be un‑collectible. As it relates to consumer loans, management charges-off those loans when the loan is contractually 90 days past due. Under special circumstances, a consumer or non‑consumer loan may be more than 90 days delinquent as to interest or principal and not be placed on non‑accrual status. This situation generally results when a Subsidiary Bank has a borrower who is experiencing financial difficulties, but not to the extent that requires a restructuring of indebtedness. The majority of this category is composed of loans that are considered to be adequately secured and/or for which there are expected future payments. When a loan is placed on non‑accrual status, any interest accrued, not paid is reversed and charged to operations against interest income. As it relates to non‑consumer loans that are not 90 days past due, management will evaluate each of these loans to determine if placing the loan on non‑accrual status is warranted. Interest income on non‑accrual loans is recognized only to the extent payments are received or when, in management’s opinion, the debtor’s financial condition warrants reestablishment of interest accruals. Other Real Estate Owned and Reposessed Assets Other real estate owned is comprised of real estate acquired by foreclosure and deeds in lieu of foreclosure. Other real estate is carried at the lower of the recorded investment in the property or its fair value less estimated costs to sell such property (as determined by independent appraisal). Prior to foreclosure, the value of the underlying loan is written down to the fair value of the real estate to be acquired by a charge to the allowance for probable loan losses, if necessary. Any subsequent write‑downs are charged against other non‑interest expense through a valuation allowance. Other real estate owned totaled approximately $57,344,000 and $30,519,000 at December 31, 2018 and 2017, respectively. Other real estate owned is included in other assets. Reposessed assets consist primarily of non-real estate assets acquired by foreclosure. Prior to foreclosure, the value of the underlying loan is written down to the fair value of the asset to be repossessed by a charge to the allowance for probable loan losses, if necessary. Reposessed assets are included in other assets on the consolidated financial statements and totaled approximately $6,454,000 and $303,000 at December 31, 2018 and 2017, respectively. Bank Premises and Equipment Bank premises and equipment are stated at cost less accumulated depreciation. Depreciation is computed on straight‑line and accelerated methods over the estimated useful lives of the assets. Repairs and maintenance are charged to operations as incurred and expenditures for renewals and betterments are capitalized. Other Investments Other investments include equity investments in non‑financial companies, as well as equity securities with no readily determinable fair market value. Equity investments are accounted for using the equity method of accounting. Equity securities with no readily determinable fair value are accounted for using the cost method. Cash Surrender Value of Bank Owned Life Insurance Cash surrender value of bank owned life insurance includes investments in cash value insurance policies to assist with financing employee compensation and benefit programs. The cash value of the underlying policies accumulates on a tax-free basis and is received through death proceeds, which are also tax-free. The earnings on the policies are derived from the investment portfolio returns of the individual insurance carriers for general account policies and on the returns on investments segregated in our name for separate account policies. Revenue Recognition On January 1, 2018, we adopted the provisions of ASU 2014-09 to ASC 606, “Revenue from Contracts with Customers.” Since our revenue is primarily comprised of net interest income on financial assets and liabilities, which were excluded from the scope of the update, the remaining non-interest revenue streams were identified and then analyzed under the provisions of the update, to: (i) indentify the contract, (ii) identify the performance obligation, (iii) determine the transaction price, (iv) allocate the transaction price to the performance obligations, and (v) recognize revenue when the performance obligation was satisfied. Our non-interest revenue contracts with customers are primarily short term and our performance obligation is satisfied at a single point in time, typically within a single period. No changes to our existing methods for recognizing revenue were made as a result of the update. Income Taxes Deferred income tax assets and liabilities are determined using the asset and liability method. Under this method, the net deferred tax asset or liability is determined based on the tax effects of the differences between the book and tax basis of the various balance sheet assets and liabilities and gives current recognition to changes in tax rates and laws. We file a consolidated federal income tax return with our subsidiaries. Recognition of deferred tax assets is based on management’s assessment that the benefit related to certain temporary differences, tax operating loss carry forwards, and tax credits are more likely than not to be realized. A valuation allowance is recorded for the amount of the deferred tax items for which it is more likely than not that the tax benefits will not be realized. We evaluate uncertain tax positions at the end of each reporting period. We may recognize the tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. The tax benefit recognized in the financial statements from any such a position is measured based on the largest benefit that has a greater than fifty percent likelihood of being realized upon ultimate settlement. As of December 31, 2018 and 2017, respectively, after evaluating all uncertain tax positions, we have recorded no liability for unrecognized tax benefits at the end of the reporting period. We would recognize any interest accrued on unrecognized tax benefits as other interest expense and penalties as other non‑interest expense. During the years ended December 31, 2018, 2017 and 2016, we recognized no interest expense or penalties related to uncertain tax positions. We file consolidated tax returns in the U.S. Federal jurisdiction and various state jurisdictions. We are no longer subject to U.S. federal or state income tax examinations by tax authorities for years before 2015. Stock Options Compensation expense for stock awards is based on the market price of the stock on the measurement date, which is generally the date of grant, and is recognized ratably over the service period of the award. The fair value of stock options granted was estimated using the Black‑Sholes‑Merton option‑pricing model. This model was developed for use in estimating the fair value of publicly traded options that have no vesting restrictions and are fully transferable. Additionally, the model requires the input of highly subjective assumptions. Because our employee stock options have characteristics significantly different from those of publicly traded options, and because changes in the subjective input assumptions can materially affect the fair value estimate, in management’s opinion, the Black‑Scholes‑Merton option‑pricing model does not necessarily provide a reliable single measure of the fair value of our stock options. Net Income Per Share Basic Earnings Per Share (“EPS”) is calculated by dividing net income by the weighted average number of common shares outstanding. The computation of diluted EPS assumes the issuance of common shares for all dilutive potential common shares outstanding during the reporting period. The dilutive effect of stock options is considered in earnings per share calculations, if dilutive, using the treasury stock method. Goodwill and Identified Intangible Assets Goodwill represents the excess of costs over fair value of assets of businesses acquired. Goodwill is tested for impairment at least annually or on an interim basis if an event triggering impairment may have occurred. As of October 1, 2018, after completing goodwill testing, we have determined that no goodwill impairment exists. Identified intangible assets are acquired assets that lack physical substance but can be distinguished from goodwill because of contractual or other legal rights or because the asset is capable of being sold or exchanged either on its own or in combination with a related contract, asset, or liability. Our identified intangible assets relate to core deposits and contract rights. As of December 31, 2018, we have determined that no impairment of identified intangibles exists. Identified intangible assets with definite useful lives are amortized on an accelerated basis over their estimated life. See Note 6—Goodwill and Other Intangible Assets. Impairment of Long‑Lived Assets Long‑lived assets, such as property, plant and equipment, and purchased intangibles subject to amortization, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying value of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying value of the asset to the estimated undiscounted future cash flows expected to be generated by the asset. If the carrying value of an asset exceeds its estimated future cash flows, an impairment charge is recognized by the amount by which the carrying value of the asset exceeds the fair value of the asset. Assets to be disposed of would be separately presented in the statement of condition and reported at the lower of the carrying value or fair value less costs to sell, and are no longer depreciated. The assets and liabilities of a disposed group classified as held for sale would be presented separately in the appropriate asset and liability sections of the statement of condition. Consolidated Statements of Cash Flows For purposes of the consolidated statements of cash flows, we consider all short‑term investments with a maturity at date of purchase of three months or less to be cash equivalents. Also, we report transactions related to deposits and loans to customers on a net basis. Accounting for Transfers and Servicing of Financial Assets We account for transfers and servicing of financial assets and extinguishments of liabilities based on the application of a financial‑components approach that focuses on control. After a transfer of financial assets, we recognize the financial and servicing assets we control and liabilities we have incurred, derecognize financial assets when control has been surrendered and derecognize liabilities when extinguished. We have retained mortgage servicing rights in connection with the sale of mortgage loans. Because we may not initially identify loans as originated for resale, all loans are initially treated as held for investment. The value of the mortgage servicing rights are reviewed periodically for impairment and are amortized in proportion to, and over the period of estimated net servicing income or net servicing losses. The value of the mortgage servicing rights is not significant to the consolidated statements of condition. Segments of an Enterprise and Related Information We operate as one segment. The operating information used by our chief executive officer for purposes of assessing performance and making operating decisions is the consolidated financial statements presented in this report. We have five active operating subsidiaries, namely, the Subsidiary Banks. We apply the provisions of ASC Topic 280, “Segment Reporting,” in determining our reportable segments and related disclosures. Comprehensive Income (Loss) Comprehensive income (loss) consists of net income and other comprehensive income (loss). Other comprehensive income (loss) includes unrealized gains and losses on securities available for sale. Advertising Advertising costs are expensed as incurred. Reclassifications Certain amounts in the prior year’s presentations have been reclassified to conform to the current presentation. These reclassifications had no effect on previously reported net income or shareholders’ equity. New Accounting Standards In May 2014, the FASB issued Accounting Standards Update No. 2014-09 to ASC 606, “Revenue from Contracts with Customers.” The update sets a common standard that defines revenue and the principles for recognizing revenue. The update outlines when an entity should recognize revenue, among other matters. At its core, the update states that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for those goods or services. The update also outlines the steps that entities should take to determine and record the current revenue number including: (i) identify the contract(s) with a customer, (ii) identify the performance obligations in the contract(s), (iii) determine the transaction price, (iv) allocate the transaction price to the performance obligations in the contract(s), and (v) recognize revenue when (or as) the entity satisfies the identified performance obligations in the contract(s). The update was originally effective for annual periods beginning after December 31, 2016 and the interim periods within that reporting period. In August 2015, the FASB issued Accounting Standards Update No. 2015-14 which deferred the effective date of ASU 2014-09 by one year to annual and interim periods beginning after December 15, 2017. On January 1, 2018, we adopted the provisions of ASU 2014-09 to ASC 606. Our revenue is primarily comprised of net interest income on financial assets and financial liabilities, which is explicitly excluded from the scope of ASC 606. We have evaluated the impact of the accounting standards update on certain other non-interest revenue streams that the provisions of the update apply to and has determined that the adoption of the new provisions to ASC 606 did not have a significant impact to our consolidated financial statements or operations. In January 2016, the FASB issued Accounting Standards Update No. 2016-01 to ASC 825-10, “Financial Instruments – Overall.” The update amends existing standards regarding certain aspects of recognition and measurement of financial assets and financial liabilities. The amendments in the update establish the following guidance: (i) requires equity investments, except those accounted for under the equity method of accounting or those that result in consolidation of the investee, to be measured at fair value with changes in fair value recognized in net income, (ii) simplifies the impairment assessment of equity securities without readily determinable fair values by requiring a qualitative assessment, (iii) eliminates the requirement to disclose the fair value of financial instruments measured at amortized cost for entities that are not public business entities, (iv) eliminates the requirement for public business entities to disclose the methods and significant assumptions used to estimate fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet, (v) requires public business entities to use the exit price notion when measuring fair value for disclosure purposes, (vi) requires an entity to present separately, in other comprehensive income, the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option, (vii) requires separate presentation of financial assets and liabilities by measurement category and form of financial assets on the balance sheet or in the accompanying notes to the financial statements, and (viii) clarifies that an entity should evaluate the need to a valuation allowance on a deferred tax asset related to available-for-sale securities in combination with the entity’s other deferred tax assets. The update is effective for interim and annual periods beginning after December 15, 2017. On January 1, 2018, we adopted the provisions of ASU 2016-01 The main effect resulting from the adoption of the new standards is that beginning on January 1, 2018, equity securities with readily determinable fair values are now reported in a single line item on the face of our consolidated statement of condition under the caption, “Equity securities with readily determinable fair values.” Additionally, the changes in fair value of the equity securities is now recognized in net income and is included in other non-interest expense on the face of our consolidated income statement. Prior to January 1, 2018, the equity securities were classified as available-for-sale and stated at fair value with unrealized gains and losses included in accumulated comprehensive income, net of tax and had a net unrealized loss of $189,000. Other equity securities without readily determinable fair values are recorded at cost less any impairment, if any, and included in other investments in our consolidated financial statements. In February 2016, the FASB issued Accounting Standards Update No. 2016-02 to ASC 820, “Leases.” The update amends existing standards for accounting for leases by lessees, with accounting for leases by lessors remaining mainly unchanged from current guidance. The update requires that lessees recognize a lease liability and a right of use asset for all leases (with the exception of short-term leases) at the commencement date of the lease and disclose key information about leasing arrangements. The update is to be applied on a modified retrospective basis for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the consolidated financial statements. The update is effective for interim and annual periods beginning after December 15, 2018. In January 2018, the FASB issued a proposal that provides an additional transition method that would allow entities to not apply the guidance in the update in the comparative periods presented in the consolidated financial statements, but instead recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. The adoption of the update is not expected to have a significant impact to our consolidated financial statements. 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 amends the accounting for credit losses on available-for-sale debt securities and purchased financial assets with credit deterioration and effective for interim and annual periods beginning after December 15, 2019. The change in accounting method represents a significant difference to current accounting practice over the accounting for credit losses on financial assets. We have formed a task force including key members of the teams that work with the current calculation of the allowance for probable loan losses and members representing the corporate accounting and risk management areas. The task force will be working with a plan to develop and implement the changes to current practice with support from third-party vendors. We cannot estimate at this time the impact of ASC 326. In January 2017, the FASB issued Accounting Standards

Investment Securities

Investment Securities	12 Months Ended
	Dec. 31, 2018
Investment Securities
Investment Securities	(2) Investment Securities The amortized cost and estimated fair value by type of investment security at December 31, 2018 are as follows: Held to Maturity Gross Gross Amortized unrealized unrealized Estimated Carrying cost gains losses fair value value (Dollars in Thousands) Other securities $ 1,200 $ — $ — $ 1,200 $ 1,200 Total investment securities $ 1,200 $ — $ — $ 1,200 $ 1,200 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 $ 3,295,366 $ 6,813 $ (79,169) $ 3,223,010 $ 3,223,010 Obligations of states and political subdivisions 185,799 2,646 (105) 188,340 188,340 Total investment securities $ 3,481,165 $ 9,459 $ (79,274) $ 3,411,350 $ 3,411,350 (1) Included in the carrying value of residential mortgage‑ backed securities are $501,293 of mortgage‑backed securities issued by Ginnie Mae and $2,721,717 of mortgage‑backed securities issued by Fannie Mae and Freddie Mac The amortized cost and estimated fair value of investment securities at December 31, 2018, 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 $ — $ — $ — $ — Due after one year through five years 1,200 1,200 — — Due after five years through ten years — — 500 502 Due after ten years — — 185,299 187,838 Residential mortgage-backed securities — — 3,295,366 3,223,010 Total investment securities $ 1,200 $ 1,200 $ 3,481,165 $ 3,411,350 The amortized cost and estimated fair value by type of investment security at December 31, 2017 are as follows: Held to Maturity Gross Gross Amortized unrealized unrealized Estimated Carrying cost gains losses fair value value (Dollars in Thousands) Other securities $ 2,400 $ — $ — $ 2,400 $ 2,400 Total investment securities $ 2,400 $ — $ — $ 2,400 $ 2,400 Available for Sale Gross Gross Estimated Amortized unrealized unrealized fair Carrying cost gains losses value value (1) (Dollars in Thousands) Residential mortgage-backed securities $ 3,943,092 $ 14,110 $ (65,969) $ 3,891,233 $ 3,891,233 Obligations of states and political subdivisions 225,096 7,871 (16) 232,951 232,951 Equity securities 28,075 293 (482) 27,886 27,886 Total investment securities $ 4,196,263 $ 22,274 $ (66,467) $ 4,152,070 $ 4,152,070 (1) Included in the carrying value of residential mortgage‑ backed securities are $654,063 of mortgage‑backed securities issued by Ginnie Mae, $3,237,1700 of mortgage‑backed securities issued by Fannie Mae and Freddie Mac Residential mortgage‑backed securities are securities issued by Freddie Mac, Fannie Mae, Ginnie Mae or non‑government entities. Investments in residential mortgage‑backed securities issued by Ginnie Mae are fully guaranteed by the U.S. government. Investments in mortgage‑backed securities issued by Freddie Mac and Fannie Mae are not fully guaranteed by the U.S. government; however, we believe that the quality of the bonds is similar to other AAA rated bonds with limited credit risk, particularly given the placement of Fannie Mae and Freddie Mac into conservatorship by the federal government in early September 2008 and because securities issued by others that are collateralized by residential mortgage‑backed securities issued by Fannie Mae and Freddie Mac are rated consistently as AAA rated securities. The amortized cost and fair value of available for sale investment securities pledged to qualify for fiduciary powers, to secure public monies as required by law, repurchase agreements and short‑term fixed borrowings was $1,112,852,000 and $1,086,360,000, respectively, at December 31, 2018. Proceeds from the sale and call of securities available‑for‑sale were $59,782,000, $396,066,000 and $352,743,000 during 2018, 2017 and 2016, respectively, which amounts included $0, $377,756,000 and $338,138,000 of mortgage‑backed securities. Gross gains of $3,000, $1,186,000 and $586,000, and gross losses of $144,000, $5,960,000 and $3,212,000 were realized on the sales in 2018, 2017 and 2016, respectively. Gross unrealized losses on investment securities and the fair value of the related securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2018 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 $ 208,384 $ (2,124) $ 2,537,181 $ (77,045) $ 2,745,565 $ (79,169) Obligations of states and political subdivisions 12,756 (99) 512 (6) 13,268 (105) $ 221,140 $ (2,223) $ 2,537,693 $ (77,051) $ 2,758,833 $ (79,274) Gross unrealized losses on investment securities and the fair value of the related securities, aggregated by investment category and length of time that individual securities have been in a continuous loss position, at December 31, 2017 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 $ 1,061,577 $ (13,157) $ 2,029,455 $ (52,812) $ 3,091,032 $ (65,969) Obligations of states and political subdivisions 5,534 (9) 522 (7) 6,056 (16) Equity securities 11,499 (251) 8,019 (231) 19,518 (482) $ 1,078,610 $ (13,417) $ 2,037,996 $ (53,050) $ 3,116,606 $ (66,467) The unrealized losses on investments in residential mortgage‑backed securities are primarily caused by changes in market interest rates. Residential mortgage‑backed securities are primarily securities issued by Freddie Mac, Fannie Mae and Ginnie Mae. The contractual cash obligations of the securities issued by Ginnie Mae are fully guaranteed by the U.S. government. The contractual cash obligations of the securities issued by Freddie Mac and Fannie Mae are not fully guaranteed by the U.S. government; however, we believe that the quality of the bonds is similar to other AAA rated bonds with limited credit risk, particularly given the placement of Fannie Mae and Freddie Mac into conservatorship by the federal government in early September 2008 and because securities issued by others that are collateralized by residential mortgage‑backed securities issued by Fannie Mae and Freddie Mac are rated consistently as AAA rated securities. The decrease in fair value on residential mortgage‑backed securities issued by Freddie Mac, Fannie Mae and Ginnie Mae is due to market interest rates. We have no intent to sell and more likely than not be required to sell before a market price recovery or maturity of the securities; therefore, it is our conclusion that the investments in residential mortgage‑backed securities issued by Freddie Mac, Fannie Mae and Ginnie Mae are not considered other‑than‑temporarily impaired. In addition, we had a small investment in non‑agency residential mortgage‑backed securities that had additional market volatility beyond economically induced interest rate events, which were sold in the first quarter of 2017. We concluded that the investments in non‑agency residential mortgage‑backed securities were other‑than‑temporarily impaired due to both credit and other than credit issues. No impairment charges were recorded in 2017. Impairment charges of $354,000 ($230,100, after tax) were recorded in 2016 on the non‑agency residential mortgage backed securities. The impairment charges represent the credit related impairment on the securities. The unrealized losses on investments in other securities are caused by fluctuations in market interest rates. The underlying cash obligations of the securities are guaranteed by the entity underwriting the debt instrument. We believe that the entity issuing the debt will honor its interest payment schedule, as well as the full debt at maturity. We purchased the securities for their economic value. The decrease in fair value is primarily due to market interest rates and not other factors, and because we have no intent to sell and will more likely than not be required to sell before a market price recovery or maturity of the securities, it is our conclusion that the investments are not considered other‑than‑temporarily impaired. The following table presents a reconciliation of credit‑related impairment charges on available‑for‑sale investments recognized in earnings for the twelve months ended December 31, 2017 (in Thousands): Balance at December 31, 2016 $ Sale of other-than-temporarily impaired available-for-sale securities during period (13,931) Balance at December 31, 2017 $ — The following table presents a reconciliation of credit‑related impairment charges on available‑for‑sale investments recognized in earnings for the twelve months ended December 31, 2016 (in Thousands): Balance at December 31, 2015 $ Impairment charges recognized during period Balance at December 31, 2016 $ Equity securities with readily determinable fair values consist primarily of Community Reinvestment Act funds. At December 31, 2018 and December 31, 2017, the balance in equity securities with readily determinable fair values recorded at fair value were $5,937,000 and $27,886,000, respectively. Prior to January 1, 2018, the equity securities were included in available-for-sale securities, with the related unrealized gain or loss recorded as a component of other comprehensive income (loss). The following is a summary of unrealized and realized gains and losses recognized in net income on equity securities during the twelve months ended December 31, 2018: Year Ended December 31, (Dollars in Thousands) 2018 Net losses recognized during the period on equity securities $ (388) 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 $ (388)

Loans

Loans	12 Months Ended
	Dec. 31, 2018
Loans
Loans	(3) Loans A summary of loans, by loan type at December 31, 2018 and 2017 is as follows: December 31, December 31, 2018 2017 (Dollars in Thousands) Commercial, financial and agricultural $ 3,305,124 $ 3,322,668 Real estate - mortgage 1,173,101 1,133,525 Real estate - construction 1,886,231 1,683,550 Consumer 46,316 49,543 Foreign 150,517 158,886 Total loans $ 6,561,289 $ 6,348,172

Allowance for Probable Loan Los

Allowance for Probable Loan Losses	12 Months Ended
	Dec. 31, 2018
Allowance for Probable Loan Losses
Allowance for Probable Loan Losses	(4) Allowance for Probable Loan Losses The allowance for probable loan losses primarily consists of the aggregate loan loss allowances of the Subsidiary Banks. The allowances are established through charges to operations in the form of provisions for probable loan losses. Loan losses or recoveries are charged or credited directly to the allowances. The allowance for probable loan losses of each Subsidiary Bank is maintained at a level considered appropriate by management, based on estimated probable losses in the loan portfolio. The allowance for probable loan losses is derived from the following elements: (i) allowances established on specific impaired loans, which are based on a review of the individual characteristics of each loan, including the customer’s ability to repay the loan, the underlying collateral values, and the industry in which the customer operates, (ii) allowances based on actual historical loss experience for similar types of loans in our loan portfolio, and (iii) allowances based on general economic conditions, changes in the mix of loans, company resources, border risk and credit quality indicators, among other things. Our management continually reviews the allowance for loan losses of the Subsidiary Banks using the amounts determined from the allowances established on specific impaired loans, the allowance established on quantitative historical loss percentages, and the allowance based on qualitative data to establish an appropriate amount to maintain in our allowance for probable loan losses. Should any of the factors considered by management in evaluating the adequacy of the allowance for probable loan losses change, our estimate of probable loan losses could also change, which could affect the level of future provisions for probable loan losses. While the calculation of the allowance for probable loan losses utilizes management’s best judgment and all information available, the adequacy of the allowance is dependent on a variety of factors beyond our control, including, among other things, the performance of the entire loan portfolio, the economy, changes in interest rates and the view of regulatory authorities towards loan classifications. The loan loss provision is determined using the following methods. On a weekly basis, 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 classified 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 classified report because of issues related to the analysis of the credit, credit documents, collateral and/or payment history. World and U.S. economic conditions have continued to improve; however, there remains some uncertainty created by continued issues with negative demographic trends, weak labor participation rates, enormous government debt, excessive regulations, and unfunded entitlement programs that could create a financial crisis. The impact to the world and U.S. economy from these issues is being magnified by a lack of appropriate government action to find solutions to the problems. Economic risk factors are minimized by the underwriting standards of the Subsidiary Banks. The general underwriting standards encompass the following principles: (i) the financial strength of the borrower including strong earnings, a high net worth, significant liquidity and an acceptable debt to worth ratio, (ii) managerial and business competence, (iii) the ability to repay, (iv) for a new business, projected cash flows, (v) loan to value, (vi) in the case of a secondary guarantor, a guarantor financial statement, and (vii) financial and/or other character references. Although the underwriting standards reduce the risk of loss, unique risk factors exist in each type of loan in which the Subsidiary Banks invest. Commercial and industrial loans are mostly secured by the collateral pledged by the borrower that is directly related to the business activities of the company such as accounts receivable and inventory. The ability of the borrower to collect accounts receivable, and to turn inventory into sales are risk factors in the repayment of the loan. Construction and land development loans can carry risk of repayment when projects incur cost overruns, have an increase in the price of building materials, encounter zoning and environmental issues, or encounter other factors that may affect the completion of a project on time and on budget. Additionally, repayment risk may be negatively impacted when the market experiences a deterioration in the value of real estate. Risks specifically related to 1‑4 family development loans also include the practice by the mortgage industry of more restrictive underwriting standards, which inhibits the buyer from obtaining long term financing and excessive housing and lot inventory in the market. Commercial real estate loans demonstrate a 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 industry that is significant to the local economy, such as a manufacturing plant. First and second lien residential 1-4 family mortgage and consumer loan repayments may be affected by unemployment or underemployment and deteriorating market values of real estate. A summary of the changes in the allowance for probable loan losses by loan class is as follows: December 31, 2018 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, $ 27,905 $ 11,675 $ 16,663 $ 1,109 $ 2,950 $ 6,103 $ 440 $ 842 $ 67,687 Losses charge to allowance (14,220) (1) (70) — (122) (347) (362) (3) (15,125) Recoveries credited to allowance 1,981 25 246 — 36 369 43 10 2,710 Net losses charged to allowance (12,239) 24 176 — (86) 22 (319) 7 (12,415) Provision (credit) charged to operations (3,070) 3,424 2,514 699 603 1,594 326 22 6,112 Balance at December 31, $ 12,596 $ 15,123 $ 19,353 $ 1,808 $ 3,467 $ 7,719 $ 447 $ 871 $ 61,384 December 31, 2017 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, $ 25,649 $ 13,889 $ 16,731 $ 806 $ 2,455 $ 3,716 $ 531 $ 884 $ 64,661 Losses charge to allowance (12,094) (213) (40) — (101) (340) (309) (1) (13,098) Recoveries credited to allowance 4,020 21 527 — 11 258 45 21 4,903 Net losses charged to allowance (8,074) (192) 487 — (90) (82) (264) 20 (8,195) Provision (credit) charged to operations 10,330 (2,022) (555) 303 585 2,469 173 (62) 11,221 Balance at December 31, $ 27,905 $ 11,675 $ 16,663 $ 1,109 $ 2,950 $ 6,103 $ 440 $ 842 $ 67,687 December 31, 2016 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, $ 21,431 $ 13,920 $ 19,769 $ 1,248 $ 3,509 $ 5,321 $ 638 $ 1,152 $ 66,988 Losses charge to allowance (32,959) (16) (1,890) (180) (70) (331) (414) (41) (35,901) Recoveries credited to allowance 7,110 6,099 119 — 21 278 69 19 13,715 Net losses charged to allowance (25,849) 6,083 (1,771) (180) (49) (53) (345) (22) (22,186) Provision (credit) charged to operations 30,067 (6,114) (1,267) (262) (1,005) (1,552) 238 (246) 19,859 Balance at December 31, $ 25,649 $ 13,889 $ 16,731 $ 806 $ 2,455 $ 3,716 $ 531 $ 884 $ 64,661 The allowance for probable loan losses is a reserve established through a provision for probable loan losses charged to expense, which represents management’s best estimate of probable loan losses when evaluating loans (i) individually or (ii) collectively. The decrease in the provision for probable loan losses charged to expense for the years ended December 31, 2018 and December 31, 2017 can be attributed to a decrease in the historical loss experience in the commercial category of the calculation. As discussed in prior periods, charge-offs increased from historical levels due to the deterioration of one relationship that was secured by multiple pieces of transportation equipment beginning in the fourth quarter of 2014. We use a three-year historical charge-off experience in the calculation, therefore, as those charge-offs are eliminated from the calculation, the allowance for probable loan losses is impacted. As fluctuations occur in historical loss factors, management evaluates the need to adjust the qualitative factors used in the calculation to properly reflect probable loan losses. The increase in losses charged to the allowance for probable loan losses for the year ended December 31, 2016 can be attributed to further deterioration in the previously identified and charged down relationship primarily secured by multiple pieces of transportation equipment. In March 2016, litigation against the management of the borrower was filed in the State of Nevada, resulting in a going concern issue with the borrower’s operations and the future use of the transportation equipment pledged as collateral on the relationship. As a result, management, in accordance with its credit review procedures, re-evaluated the collateral values on the equipment in light of the new circumstances and reduced the collateral values accordingly, resulting in a further charge-down of the relationship of approximately $19.4 million, which is included in the losses charged to the allowance in the commercial category in the table detailing the year ended December 31, 2016 activity. The table below provides additional information on the balance of loans individually or collectively evaluated for impairment and their related allowance, by loan class: December 31, 2018 Loans Individually Loans Collectively Evaluated For Evaluated For Impairment Impairment Recorded Recorded Investment Allowance Investment Allowance (Dollars in Thousands) Domestic Commercial $ 9,179 $ 656 $ 1,119,790 $ 11,940 Commercial real estate: other construction & land development 2,092 116 1,884,139 15,007 Commercial real estate: farmland & commercial 3,509 — 1,946,389 19,353 Commercial real estate: multifamily 507 — 225,750 1,808 Residential: first lien 6,244 — 439,556 3,467 Residential: junior lien 901 — 726,400 7,719 Consumer 1,175 — 45,141 447 Foreign 293 — 150,224 871 Total $ 23,900 $ 772 $ 6,537,389 $ 60,612 December 31, 2017 Loans Individually Loans Collectively Evaluated For Evaluated For Impairment Impairment Recorded Recorded Investment Allowance Investment Allowance (Dollars in Thousands) Domestic Commercial $ 17,947 $ 300 $ 1,068,520 $ 27,605 Commercial real estate: other construction & land development 2,455 116 1,681,095 11,559 Commercial real estate: farmland & commercial 33,123 18 2,010,162 16,645 Commercial real estate: multifamily 476 — 192,440 1,109 Residential: first lien 6,852 — 425,925 2,950 Residential: junior lien 723 — 700,025 6,103 Consumer 1,281 — 48,262 440 Foreign 347 — 158,539 842 Total $ 63,204 $ 434 $ 6,284,968 $ 67,253 The decrease in loans individually evaluated for impairment at December 31, 2018 compared to December 31, 2017, can be attributed to the foreclosure on a relationship primarily secured by a water park and the foreclosure of the collateral on a relationship secured by multiple pieces of transportation equipment. The foreclosure of the collateral securing the two relationships is also impacting the balances reported as impaired loans in the following tables. Loans accounted for on a non‑accrual basis at December 31, 2018, 2017 and 2016 amounted to $15,791,000, $54,730,000 and $37,245,000, respectively. The effect of such non‑accrual loans reduced interest income by approximately $1,119,000, $977,000 and $2,461,000 for the years ended December 31, 2018, 2017 and 2016, respectively. Amounts received on non‑accruals are applied, for financial accounting purposes, first to principal and then to interest after all principal has been collected. Accruing loans contractually past due 90 days or more as to principal or interest payments at December 31, 2018, 2017 and 2016 amounted to approximately $40,674,000, $7,257,000 and $5,226,000, respectively and can be attributed to a relationship that is secured by multiple pieces of real property on which car dealerships are operated. The table below provides additional information on loans accounted for on a non‑accrual basis by loan class: December 31, 2018 December 31, 2017 (Dollars in Thousands) Domestic Commercial $ 9,143 $ 17,909 Commercial real estate: other construction & land development 2,092 2,455 Commercial real estate: farmland & commercial 3,509 33,123 Commercial real estate: multifamily 507 476 Residential: first lien 347 712 Residential: junior lien 171 11 Consumer 22 44 Total non-accrual loans $ 15,791 $ 54,730 Impaired loans are those loans where it is probable that all amounts due according to contractual terms of the loan agreement will not be collected. We have identified these loans through our normal loan review procedures. Impaired loans are measured based on (i) the present value of expected future cash flows discounted at the loan’s effective interest rate; (ii) the loan’s observable market price; or (iii) the fair value of the collateral if the loan is collateral dependent. Substantially all of our impaired loans are measured at the fair value of the collateral. In limited cases, we may use other methods to determine the level of impairment of a loan if such loan is not collateral dependent. The following tables detail key information regarding our impaired loans by loan class for the year ended December 31, 2018: December 31, 2018 Unpaid Average Recorded Principal Related Recorded Interest Investment Balance Allowance Investment Recognized (Dollars in Thousands) Loans with Related Allowance Domestic Commercial $ 1,563 $ 2,161 $ 656 $ 1,741 $ — Commercial real estate: other construction & land development 135 169 116 141 — Total impaired loans with related allowance $ 1,698 $ 2,330 $ 772 $ 1,882 $ — December 31, 2018 Unpaid Average Recorded Principal Recorded Interest Investment Balance Investment Recognized (Dollars in Thousands) Loans with No Related Allowance Domestic Commercial $ 7,616 $ 7,730 $ 16,194 $ 3 Commercial real estate: other construction & land development 1,957 2,205 2,151 — Commercial real estate: farmland & commercial 3,509 4,031 36,632 — Commercial real estate: multifamily 507 538 565 — Residential: first lien 6,244 6,386 7,136 305 Residential: junior lien 901 911 976 44 Consumer 1,175 1,190 1,211 2 Foreign 293 293 327 14 Total impaired loans with no related allowance $ 22,202 $ 23,284 $ 65,192 $ 368 The following tables detail key information regarding our impaired loans by loan class for the year ended December 31, 2017: December 31, 2017 Unpaid Average Recorded Principal Related Recorded Interest Investment Balance Allowance Investment Recognized (Dollars in Thousands) Loans with Related Allowance Domestic Commercial real estate: other construction & land development $ 1,300 $ 1,577 $ 300 1,346 — Commercial real estate: farmland & commercial 145 169 116 150 — Commercial real estate: multifamily 449 590 18 489 — Total impaired loans with related allowance $ 1,894 $ 2,336 $ 434 $ 1,985 $ — December 31, 2017 Unpaid Average Recorded Principal Recorded Interest Investment Balance Investment Recognized (Dollars in Thousands) Loans with No Related Allowance Domestic Commercial $ 16,646 $ 44,095 $ 19,615 $ 3 Commercial real estate: other construction & land development 2,310 2,455 3,493 — Commercial real estate: farmland & commercial 32,675 33,275 38,536 — Commercial real estate: multifamily 476 505 511 — Residential: first lien 6,852 6,968 7,249 324 Residential: junior lien 723 736 970 45 Consumer 1,281 1,283 1,293 3 Foreign 347 347 750 16 Total impaired loans with no related allowance $ 61,310 $ 89,664 $ 72,417 $ 391 A portion of the impaired loans have adequate collateral and credit enhancements not requiring a related allowance for loan loss. Management is confident our loss exposure regarding these credits will be significantly reduced due to our long‑standing practices that emphasize secured lending with strong collateral positions and guarantor support. Management is likewise confident the reserve for probable loan losses is adequate. Management recognizes the risks associated with these impaired loans. However, management's decision to place loans in this category does not necessarily mean that losses will occur. In the current environment, troubled loan management can be protracted because of the legal and process problems that delay the collection of an otherwise collectible loan. Additionally, management believes that the collateral related to these impaired loans and/or the secondary support from guarantors mitigates the potential for losses from impaired loans. 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 impaired loans. December 31, 2018 December 31, 2017 (Dollars in Thousands) Domestic Commercial $ 35 $ 6,910 Commercial real estate: farmland & commercial — — Residential: first lien 5,947 6,140 Residential: junior lien 730 712 Consumer 1,153 1,237 Foreign 293 347 Total troubled debt restructuring $ 8,158 $ 15,346 The Subsidiary Banks charge-off that portion of any loan which management considers to represent a loss, as well as that portion of any other loan which is classified as a “loss” by bank examiners. Commercial and industrial or real estate loans are generally considered by management to represent a loss, in whole or part, when an exposure beyond any collateral coverage is apparent and when no further collection of the loss portion is anticipated based on the borrower’s financial condition and general economic conditions in the borrower’s industry. Generally, unsecured consumer loans are charged‑off when 90 days past due. While management considers that it is generally able to identify borrowers with financial problems reasonably early and to monitor credit extended to such borrowers carefully, there is no precise method of predicting loan losses. The determination that a loan is likely to be uncollectible and that it should be wholly or partially charged‑off as a loss is an exercise of judgment. Similarly, the determination of the adequacy of the allowance for probable loan losses can be made only on a subjective basis. It is the judgment of our management that the allowance for probable loan losses at December 31, 2018 and December 31, 2017, was adequate to absorb probable losses from loans in the portfolio at that date. The following table presents information regarding the aging of past due loans by loan class: December 31, 2018 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 $ 4,651 $ 1,089 $ 19,851 $ 10,890 $ 25,591 $ 1,103,378 $ 1,128,969 Commercial real estate: other construction & land development 727 1,707 922 16 3,356 1,882,875 1,886,231 Commercial real estate: farmland & commercial 2,928 784 27,239 24,910 30,951 1,918,947 1,949,898 Commercial real estate: multifamily 927 — 578 71 1,505 224,752 226,257 Residential: first lien 3,998 1,677 3,362 3,079 9,037 436,763 445,800 Residential: junior lien 1,155 618 1,108 937 2,881 724,420 727,301 Consumer 486 19 45 32 550 45,766 46,316 Foreign 1,106 117 739 739 1,962 148,555 150,517 Total past due loans $ 15,978 $ 6,011 $ 53,844 $ 40,674 $ 75,833 $ 6,485,456 $ 6,561,289 December 31, 2017 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 $ 3,790 $ 398 $ 18,308 $ 537 $ 22,496 $ 1,063,971 $ 1,086,467 Commercial real estate: other construction & land development 354 308 820 6 1,482 1,682,068 1,683,550 Commercial real estate: farmland & commercial 3,925 518 31,133 954 35,576 2,007,709 2,043,285 Commercial real estate: multifamily 84 — 476 — 560 192,356 192,916 Residential: first lien 4,295 2,458 4,095 3,861 10,848 421,929 432,777 Residential: junior lien 1,310 580 1,110 1,099 3,000 697,748 700,748 Consumer 868 98 160 133 1,126 48,417 49,543 Foreign 1,229 69 667 667 1,965 156,921 158,886 Total past due loans $ 15,855 $ 4,429 $ 56,769 $ 7,257 $ 77,053 $ 6,271,119 $ 6,348,172 The increase in the commercial real estate: farmland and commercial in the 90 days and greater category at December 31, 2018 compared to December 31, 2017 can be attributed to a relationship that is secured by multiple pieces of real property on which car dealerships are operated. The allowance based on historical loss experience on our remaining loan portfolio, which includes the “Special Review Credits,” “Watch List—Pass Credits,” and “Watch List—Substandard Credits” is determined by segregating the remaining loan portfolio into certain categories such as commercial loans, installment loans, international loans, loan concentrations and overdrafts. Installment loans are then further segregated by number of days past due. A historical loss percentage, adjusted for (i) management’s evaluation of changes in lending policies and procedures, (ii) current economic conditions in the market area served, (iii) other risk factors, (iv) the effectiveness of the internal loan review function, (v) changes in loan portfolios, and (vi) the composition and concentration of credit volume is applied to each category. Each category is then added together to determine the allowance allocated under ASC 450‑20. A summary of the loan portfolio by credit quality indicator by loan class is as follows: December 31, 2018 Special Watch Watch List— Watch List— Pass Review List—Pass Substandard Impaired (Dollars in Thousands) Domestic Commercial $ 998,625 $ 441 $ 44,544 $ 76,180 $ 9,179 Commercial real estate: other construction & land development 1,817,098 1,648 9,055 56,338 2,092 Commercial real estate: farmland & commercial 1,726,711 62,046 38,373 119,259 3,509 Commercial real estate: multifamily 224,823 — — 927 507 Residential: first lien 438,773 — 142 641 6,244 Residential: junior lien 725,538 — 862 — 901 Consumer 45,141 — — — 1,175 Foreign 150,224 — — — 293 Total $ 6,126,933 $ 64,135 $ 92,976 $ 253,345 $ 23,900 December 31, 2017 Special Watch Watch List— Watch List— Pass Review List—Pass Substandard Impaired (Dollars in Thousands) Domestic Commercial $ 905,707 $ — $ 3,170 $ 159,643 $ 17,947 Commercial real estate: other construction & land development 1,616,604 1,288 672 62,531 2,455 Commercial real estate: farmland & commercial 1,863,763 5,134 41,820 99,445 33,123 Commercial real estate: multifamily 192,440 — — — 476 Residential: first lien 425,811 40 — 74 6,852 Residential: junior lien 699,875 150 — — 723 Consumer 48,262 — — — 1,281 Foreign 158,539 — — — 347 Total $ 5,911,001 $ 6,612 $ 45,662 $ 321,693 $ 63,204 The increase in special review credits in the commercial real estate: farmland and commercial for December 31, 2018 compared to December 31, 2017 can be attributed to a relationship secured by children’s learning centers reclassified from the Pass category. The increase in Watch-List Pass commercial credits can be attributed to the reclassification of a relationship in the oil and gas production business from Watch-List Substandard. The decrease in Watch-List Substandard for December 31, 2018 can be attributed to the payoff of a relationship secured by barges used in the transportation of petroleum products, the reclassification of a relationship secured by accounts receivable to Pass and the previously mentioned reclassification of the relationship in the oil and gas production business to Watch-List Pass. The increase in Watch-List Substandard commercial credits for December 31, 2018 can be attributed to a relationship secured by real property on which car dealerships are operated from the Pass category. The decrease in Watch-List Impaired credits in the commercial real estate: farmland and commercial at December 31, 2018 can be attributed to the foreclosure of a loan relationship primarily secured by a water park.

Bank Premises and Equipment

Bank Premises and Equipment	12 Months Ended
	Dec. 31, 2018
Bank Premises and Equipment
Bank Premises and Equipment	(5) Bank Premises and Equipment A summary of bank premises and equipment, by asset classification, at December 31, 2018 and 2017 were as follows: Estimated useful lives 2018 2017 (Dollars in Thousands) Bank buildings and improvements 5 - 40 years $ 563,302 $ 550,094 Furniture, equipment and vehicles 1 - 20 years 292,958 289,743 Land 118,806 123,087 Real estate held for future expansion: Land, building, furniture, fixture and equipment 7 - 27 years — — Less: accumulated depreciation (468,167) (448,470) Bank premises and equipment, net $ 506,899 $ 514,454

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	12 Months Ended
	Dec. 31, 2018
Goodwill and Other Intangible Assets
Goodwill and Other Intangible Assets	(6) Goodwill and Other Intangible Assets The majority of our identified intangibles are in the form of amortizable core deposit premium. A small portion of the fully amortized identified intangibles represent identified intangibles in the acquisition of the rights to the insurance agency contracts of InsCorp, Inc., acquired in 2008. Information on our identified intangible assets follows: Carrying Accumulated Amount Amortization Net (Dollars in Thousands) December 31, 2018: Core deposit premium $ 58,675 $ 58,675 $ — Identified intangible (contract rights) 2,022 2,022 — Total identified intangibles $ 60,697 $ 60,697 $ — December 31, 2017: Core deposit premium $ 58,675 $ 58,675 $ — Identified intangible (contract rights) 2,022 2,022 — Total identified intangibles $ 60,697 $ 60,697 $ — Amortization expense of intangible assets for the years ended December 31, 2018, 2017 and 2016, was $0, $0 and $25,000, respectively. There were no changes in the carrying amount of goodwill for the years ended December 31, 2018 and 2017.

Deposits

Deposits	12 Months Ended
	Dec. 31, 2018
Deposits.
Deposits	(7) Deposits Deposits as of December 31, 2018 and 2017 and related interest expense for the years ended December 31, 2018, 2017 and 2016 were as follows: 2018 2017 (Dollars in Thousands) Deposits: Demand - non-interest bearing Domestic $ 2,758,768 $ 2,609,932 Foreign 696,072 633,323 Total demand non-interest bearing 3,454,840 3,243,255 Savings and interest bearing demand Domestic 2,531,854 2,615,143 Foreign 736,383 629,988 Total savings and interest bearing demand 3,268,237 3,245,131 Time, certificates of deposit $100,000 or more Domestic 590,895 637,006 Foreign 807,486 808,881 Less than $100,000 Domestic 323,377 354,998 Foreign 251,710 255,621 Total time, certificates of deposit 1,973,468 2,056,506 Total deposits $ 8,696,545 $ 8,544,892 2018 2017 2016 (Dollars in Thousands) Interest expense: Savings and interest bearing demand Domestic $ 11,029 $ 5,453 $ 3,922 Foreign 1,735 755 640 Total savings and interest bearing demand 12,764 6,208 4,562 Time, certificates of deposit $100,000 or more Domestic 4,741 3,644 3,881 Foreign 5,798 4,105 3,929 Less than $100,000 Domestic 1,589 1,312 1,447 Foreign 968 675 706 Total time, certificates of deposit 13,096 9,736 9,963 Total interest expense on deposits $ 25,860 $ 15,944 $ 14,525 Scheduled maturities of time deposits as of December 31, 2018 were as follows: Total (in thousands) 2019 $ 1,786,776 2020 138,105 2021 31,665 2022 15,717 2023 1,096 Thereafter 109 Total $ 1,973,468 Scheduled maturities of time deposits in amounts of $100,000 or more at December 31, 2018, were as follows: Total (in thousands) Due within 3 months or less $ 500,836 Due after 3 months and within 6 months 337,349 Due after 6 months and within 12 months 433,628 Due after 12 months 126,568 $ 1,398,381 Time deposits that meet or exceed the FDIC insurance limit of $250,000 at December 31, 2018 and December 31, 2017 were $869,000 and $894,000, in thousands, respectively.

Securities Sold Under Repurchas

Securities Sold Under Repurchase Agreements	12 Months Ended
	Dec. 31, 2018
Securities Sold Under Repurchase Agreements
Securities Sold Under Repurchase Agreements	(8) Securities Sold Under Repurchase Agreements Our Subsidiary Banks have entered into repurchase agreements with an investment banking firm and individual customers of the Subsidiary Banks. The purchasers have agreed to resell to the Subsidiary Banks identical securities upon the maturities of the agreements. Securities sold under repurchase agreements were mortgage‑backed securities and averaged $314,876,000 and $402,396,000 during 2018 and 2017, respectively, and the maximum amount outstanding at any month end during 2018 and 2017 was $370,495,000 and $514,616,000 respectively. Further information related to repurchase agreements at December 31, 2018 and 2017 is set forth in the following table: Collateral Securities Repurchase Borrowing Book Value of Fair Value of Balance of Weighted Average Securities Sold Securities Sold Liability Interest Rate (Dollars in Thousands) December 31, 2018 term: Overnight agreements $ 357,642 $ 349,081 $ 218,852 0.85 % 1 to 29 days — — — — 30 to 90 days — — — — Over 90 days 11,444 11,096 11,137 1.27 Total $ 369,086 $ 360,177 $ 229,989 0.87 % December 31, 2017 term: Overnight agreements $ 340,054 $ 334,506 $ 242,824 0.25 % 1 to 29 days — — — — 30 to 90 days 109,300 107,238 100,000 3.99 Over 90 days 11,327 11,168 10,981 0.74 Total $ 460,681 $ 452,912 $ 353,805 1.32 % The book value and fair value of securities sold includes the entire book value and fair value of securities partially or fully pledged under repurchase agreements.

Other Borrowed Funds

Other Borrowed Funds	12 Months Ended
	Dec. 31, 2018
Other Borrowed Funds
Other Borrowed Funds	(9) Other Borrowed Funds Other borrowed funds include Federal Home Loan Bank borrowings, which are short and long‑term fixed borrowings issued by the Federal Home Loan Bank of Dallas and the Federal Home Loan Bank of Topeka at the market price offered at the time of funding. These borrowings are secured by mortgage‑backed investment securities and a portion of our loan portfolio. Further information regarding our other borrowed funds at December 31, 2018 and 2017 is set forth in the following table: December 31, 2018 2017 (Dollars in Thousands) Federal Home Loan Bank advances—short-term Balance at year end $ 268,975 $ 945,225 Rate on balance outstanding at year end 2.70 % 1.44 % Average daily balance $ 621,357 $ 839,858 Average rate 1.97 % 1.23 % Maximum amount outstanding at any month end $ 1,007,100 $ 1,043,250 Federal Home Loan Bank advances—long-term (1) Balance at year end $ 436,690 $ 250,000 Rate on balance outstanding at year end 1.73 % 1.26 % Average daily balance $ 302,373 $ 51,644 Average rate 1.71 % 1.26 % Maximum amount outstanding at any month end $ 436,700 $ 250,000 (1) Long-term advances at December 31, 2018 consisted of both amortizing and non-amortizing advances. The non-amortizing advances mature in the following increments: $75,000,000 in July 2028, $100,000,000 in March 2033 and $250,000,000 in August 2033 and are callable by the FHLB on an annual basis. Two amortizing advances are outstanding at December 31, 2018 in the amounts of $3,200,000 and $8,490,000 and mature in December 2033 and November 2033, respectively. The amortization on the amortizing long-term advances totals approximately $179,000 per year for each of the next five years. Long-term advances outstanding at December 31, 2017 mature in the following increments: $100,000,000 in November 2027 and $150,000,000 in December 2027 and are callable by the FHLB on a quarterly basis.

Junior Subordinated Interest De

Junior Subordinated Interest Deferrable Debentures	12 Months Ended
	Dec. 31, 2018
Junior Subordinated Interest Deferrable Debentures
Junior Subordinated Interest Deferrable Debentures	(10) Junior Subordinated Deferrable Interest Debentures We have formed six statutory business trusts under the laws of the State of Delaware for the purpose of issuing trust preferred securities. These statutory business trusts (the “Trusts”) have each issued Capital and Common Securities and invested the proceeds thereof in an equivalent amount of junior subordinated debentures (the “Debentures”) we issued. As of December 31, 2018 and December 31, 2017, the principal amount of debentures outstanding totaled $160,416,000. The Debentures are subordinated and junior in right of payment to all our present and future senior indebtedness (as defined in the respective indentures) and are pari passu with one another. The interest rate payable on, and the payment terms of the Debentures are the same as the distribution rate and payment terms of the respective issues of Capital and Common Securities issued by the Trusts. We have fully and unconditionally guaranteed the obligations of each of the Trusts with respect to the Capital and Common Securities. We have the right, unless an Event of Default (as defined in the Indentures) has occurred and is continuing, to defer payment of interest on the Debentures for up to twenty consecutive quarterly periods on Trusts VI, VIII, IX, X, XI and XII. If interest payments on any of the Debentures are deferred, distributions on both the Capital and Common Securities related to that Debenture would also be deferred. The redemption prior to maturity of any of the Debentures may require the prior approval of the Federal Reserve and/or other regulatory bodies. For financial reporting purposes, the Trusts are treated as investments and not consolidated in the consolidated financial statements. Although the Capital Securities issued by each of the Trusts are not included as a component of shareholders’ equity on the consolidated statement of condition, the Capital Securities are treated as capital for regulatory purposes. Specifically, under applicable regulatory guidelines, the Capital Securities issued by the Trusts qualify as Tier 1 capital up to a maximum of 25% of Tier 1 capital on an aggregate basis. Any amount that exceeds the 25% threshold would qualify as Tier 2 capital. At December 31, 2018 and December 31, 2017, the total $160,416,000 of the Capital Securities outstanding qualified as Tier 1 capital. The following table illustrates key information about each of the Debentures and their interest rates at December 31, 2018: Junior Subordinated Deferrable Interest Repricing Interest Interest Optional Debentures Frequency Rate Rate Index(1) Maturity Date Redemption Date (1) (Dollars in Thousands) Trust VI $ 25,774 Quarterly 6.07 % LIBOR + November 2032 February 2008 Trust VIII 25,774 Quarterly 5.49 % LIBOR + October 2033 October 2008 Trust IX 41,238 Quarterly 4.02 % LIBOR + October 2036 October 2011 Trust X 21,021 Quarterly 4.19 % LIBOR + February 2037 February 2012 Trust XI 25,990 Quarterly 4.02 % LIBOR + July 2037 July 2012 Trust XII 20,619 Quarterly 4.19 % LIBOR + September 2037 September 2012 $ 160,416 (1) The Capital Securities may be redeemed in whole or in part on any interest payment date after the Optional Redemption Date.

Earnings per Share ("EPS")

Earnings per Share ("EPS")	12 Months Ended
	Dec. 31, 2018
Earnings per Share ("EPS")
Earnings per Share ("EPS")	(11) Earnings per Share (“EPS”) Basic EPS is calculated by dividing net income by the weighted average number of common shares outstanding. The computation of diluted EPS assumes the issuance of common shares for all dilutive potential common shares outstanding during the reporting period. The calculation of the basic EPS and the diluted EPS for the years ended December 31, 2018, 2017, and 2016 is set forth in the following table: Net Income Shares Per Share (Numerator) (Denominator) Amount (Dollars in Thousands, Except Per Share Amounts) December 31, 2018: Basic EPS Net income available to common shareholders $ 215,931 66,106,580 $ 3.27 Potential dilutive common shares and warrants — 527,240 Diluted EPS $ 215,931 66,633,820 $ 3.24 December 31, 2017: Basic EPS Net income available to common shareholders $ 157,436 66,046,155 $ 2.38 Potential dilutive common shares and warrants — 732,281 Diluted EPS $ 157,436 66,778,436 $ 2.36 December 31, 2016: Basic EPS Net income available to common shareholders $ 133,932 65,967,989 $ 2.03 Potential dilutive common shares — 345,501 Diluted EPS $ 133,932 66,313,490 $ 2.02

Employees' Profit Sharing Plan

Employees' Profit Sharing Plan	12 Months Ended
	Dec. 31, 2018
Employees' Profit Sharing Plan
Employees' Profit Sharing Plan	(12) Employees’ Profit Sharing Plan We have a deferred profit sharing plan for full‑time employees with a minimum of one year of continuous employment. Our annual contribution to the plan is based on a percentage, as determined by our Board of Directors, of income before income taxes, as defined, for the year. Allocation of the contribution among officers and employees’ accounts is based on length of service and amount of salary earned. Profit sharing costs of $3,850,000 $3,750,000 and $3,650,000 were charged to income for the years ended December 31, 2018, 2017, and 2016, respectively.

International Operations

International Operations	12 Months Ended
	Dec. 31, 2018
International Operations
International Operations	(13) International Operations We provide international banking services for our customers through our Subsidiary Banks. Neither we nor our Subsidiary Banks have facilities located outside the United States. International operations are distinguished from domestic operations based upon the domicile of the customer. Because the resources we employ are common to both international and domestic operations, it is not practical to determine net income generated exclusively from international activities. A summary of assets attributable to international operations at December 31, 2018 and 2017 are as follows: 2018 2017 (Dollars in Thousands) Loans: Commercial $ 101,955 $ 113,019 Others 48,562 45,867 150,517 158,886 Less allowance for probable loan losses (842) Net loans $ 149,646 $ 158,044 Accrued interest receivable $ 811 $ 671 At December 31, 2018, we had $119,302,000 in outstanding standby and commercial letters of credit to facilitate trade activities. Revenues directly attributable to international operations were approximately $5,412,000, $5,248,000 and $5,495,000 for the years ended December 31, 2018, 2017 and 2016, respectively.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2018
Income Taxes
Income Taxes	(14) Income Taxes We file a consolidated U.S. Federal and State income tax return. The current and deferred portions of net income tax expense included in the consolidated statements of income are presented below for the years ended December 31: 2018 2017 2016 (Dollars in Thousands) Current U.S. $ 48,144 $ 56,974 $ 52,403 State 3,370 2,662 3,362 Foreign (5) — — Total current taxes 51,509 59,636 55,765 Deferred U.S. 5,130 4,620 7,279 State 13 (50) 27 Total deferred taxes 5,143 4,570 7,306 Total income taxes $ 56,652 $ 64,206 $ 63,071 Total income tax expense differs from the amount computed by applying the U.S. Federal income tax rate of 21% for 2018 and 35% for 2017 and 2016 to income before income taxes. The reasons for the differences for the years ended December 31 are as follows: 2018 2017 2016 (Dollars in Thousands) Computed expected tax expense $ 57,831 $ 77,643 $ 69,253 Change in taxes resulting from: Tax-exempt interest income (3,101) (4,701) (3,940) State tax, net of federal income taxes, tax credit and refunds 2,673 1,697 3,287 Resolution of IRS exam — (4,985) — Other investment income (1,561) (3,198) (3,694) Deferred tax adjustment due to federal tax rate change (1,618) (3,168) — Net investment expense, low income housing investments 2,518 387 — Other (90) 531 (1,835) Actual tax expense $ 56,652 $ 64,206 $ 63,071 The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities at December 31, 2018 and 2017 are reflected below: 2018 2017 (Dollars in Thousands) Deferred tax assets: Loans receivable, principally due to the allowance for probable loan losses $ 12,257 $ 14,546 Other real estate owned 2,459 2,053 Impairment charges on available-for-sale securities 1,054 844 Accrued expenses 81 81 Net unrealized losses on available for sale investment securities 15,182 9,680 Other 5,076 4,434 Total deferred tax assets 36,109 31,638 Deferred tax liabilities: Bank premises and equipment, principally due to differences on depreciation (12,596) (10,940) Identified intangible assets and goodwill (13,490) (13,417) Other (14,787) (12,474) Total deferred tax liabilities (40,873) (36,831) Net deferred tax liability $ (4,764) $ (5,193) The net deferred tax liability of $4,764,000 at December 31, 2018 and $5,193,000 at December 31, 2017 is included in other liabilities in the consolidated statements of condition. On December 22, 2017, the Tax Cuts and Jobs Act (“Tax Act”) was signed into law. The Tax Act materially changes U.S. corporate income tax rates, among other things. We were in a net deferred tax liability position at the time the Tax Act was enacted and subsequently revalued the carrying value of the net deferred liability and its components to the new 21% effective tax rate. The change in the tax rate resulted in a net benefit to us of $4,786,000 and was included as a reduction to income tax expense in the consolidated income statement.

Stock Options

Stock Options	12 Months Ended
	Dec. 31, 2018
Stock Options
Stock Options	(15) 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 available for stock option grants under the 2012 Plan. Under the 2012 Plan, both qualified incentive stock options (“ISOs”) and non‑qualified stock options (“NQSOs”) may be granted. 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 December 31, 2018, 10,700 shares were available for future grants under the 2012 Plan. The fair value of each option award granted under the plan is estimated on the date of grant using a Black‑Scholes‑Merton option valuation model that uses the assumptions noted in the following table. Expected volatility is based on the historical volatility of the price of our stock. We use historical data to estimate the expected dividend yield and employee termination rates within the valuation model. The expected term of options is derived from historical exercise behavior. The risk‑free rate for periods within the contractual life of the option is based on the U.S. Treasury yield curve in effect at the time of grant. 2018 2017 Expected Life (Years) 7.00 — Dividend yield 1.73 % — % Interest rate 2.68 % — % Volatility 31.65 % — % (1) No stock options were granted during the twelve months ended December 31, 2017. A summary of option activity under the stock option plans for the twelve months ended December 31, 2018 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, 2017 668,166 $ Plus: Options granted 234,700 Less: Options exercised 84,701 Options expired — — Options forfeited 29,188 Options outstanding at December 31, 2018 788,977 $ 7,587 Options fully vested and exercisable at December 31, 2018 310,108 $ $ 4,486 Stock‑based compensation expense included in the consolidated statements of income for the years ended December 31, 2018, 2017 and 2016 was approximately $1,035,000, $903,000 and $1,082,000, respectively. As of December 31, 2018, there was approximately $2,798,000 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 2.1 years. Other information pertaining to option activity during the twelve month period ending December 31, 2018, 2017 and 2016 is as follows: Twelve Months Ended December 31, 2018 2017 2016 Weighted average grant date fair value of stock options granted $ 11.78 $ — $ 8.74 Total fair value of stock options vested $ 1,077,000 $ 1,182,000 $ 1,015,000 Total intrinsic value of stock options exercised $ 2,045,000 $ 2,595,000 $ 792,000 (1) No stock options were granted during the twelve months ended December 31, 2017.

Long Term Restricted Stock Unit

Long Term Restricted Stock Units	12 Months Ended
	Dec. 31, 2018
Long Term Restricted Stock Units
Long Term Restricted Stock Units	(16) Long Term Restricted Stock Units As a former participant in the Troubled Asset Relief Program Capital Purchase Program (the “CPP”) we were subject to certain compensation restrictions, including a prohibition on the payment or accrual of any bonuses to certain officers and employees except for awards of CPP‑compliant long‑ term restricted stock and stock units. On December 18, 2009, our board of directors (the “Board”) adopted the 2009 International Bancshares Corporation Long‑Term Restricted Stock Unit Plan (the “Plan”) to give us additional flexibility in the compensation of our officers, employees, consultants and advisors in compliance with all applicable laws and restrictions. The Plan authorizes us to issue Restricted Stock Units (“RSUs”) to our officers, employees, consultants and advisors. On December 18, 2009, pursuant to the Plan, the Board adopted resolutions creating the Long‑Term Restricted Stock Unit Plan Committee to administer the Plan. RSUs issued under the Plan are not equity and are payable only in cash. The Plan provides for both the issuance of CPP‑compliant long‑term RSUs as well as RSUs that are not CPP‑compliant. No grants have been made under the Plan since December 2012 and there are currently no outstanding grants under the Plan.

Commitments, Contingent Liabili

Commitments, Contingent Liabilities and Other Tax Matters	12 Months Ended
	Dec. 31, 2018
Commitments, Contingent Liabilities and Other Tax Matters
Commitments, Contingent Liabilities and Other Tax Matters	(17) Commitments, Contingent Liabilities and Other Matters We lease portions of our banking premises and equipment under operating leases. Total rental expense for the years ended December 31, 2018, 2017 and 2016 were approximately $5,257,000, $5,258,000 and $5,870,000, respectively. Future minimum lease payments due under non‑cancellable operating leases at December 31, 2018 were as follows: Fiscal year ending: Total (in thousands) 2019 $ 3,443 2020 3,246 2021 2,272 2022 579 2023 212 Thereafter 275 Total $ 10,027 It is expected that certain leases will be renewed as these leases expire. Aggregate future minimum rentals to be received under non‑cancellable sub‑leases greater than one year at December 31, 2018 were $82,690,000. Cash of approximately $115,721,000 and $116,129,000 at December 31, 2018 and 2017, respectively, was maintained to satisfy regulatory reserve requirements. We are involved in various legal proceedings that are in various stages of litigation. We have determined, based on discussions with our counsel that any material loss in such actions, individually or in the aggregate, is remote or the damages sought, even if fully recovered, would not be considered material to our consolidated statements of condition and related statements of income, comprehensive income, shareholders’ equity and cash flows. However, many of these matters are in various stages of proceedings and further developments could cause management to revise its assessment of these matters.

Transactions with Related Parti

Transactions with Related Parties	12 Months Ended
	Dec. 31, 2018
Transactions with Related Parties
Transactions with Related Parties	(18) Transactions with Related Parties In the ordinary course of business, the Subsidiary Banks make loans to our directors and executive officers, including their affiliates, families and companies in which they are principal owners. In the opinion of management, these loans are made on substantially the same terms, including interest rates and collateral, as those prevailing at the time for comparable transactions with other persons and do not involve more than normal risk of collectability or present other unfavorable features. The aggregate amounts receivable from such related parties amounted to approximately $33,042,000 and $27,626,000 at December 31, 2018 and 2017, respectively.

Financial Instruments with Off-

Financial Instruments with Off-Statement of Condition Risk and Concentrations of Credit Risk	12 Months Ended
	Dec. 31, 2018
Financial Instruments with Off-Statement of Condition Risk and Concentrations of Credit Risk
Financial Instruments with Off-Statement of Condition Risk and Concentrations of Credit Risk	(19) Financial Instruments with Off‑Statement of Condition Risk and Concentrations of Credit Risk In the normal course of business, the Subsidiary Banks are party to financial instruments with off‑statement of condition risk to meet the financing needs of their customers. These financial instruments include commitments to their customers. These financial instruments involve, to varying degrees, elements of credit risk in excess of the amounts recognized in the consolidated statement of condition. The contract amounts of these instruments reflect the extent of involvement the Subsidiary Banks have in particular classes of financial instruments. At December 31, 2018, the following financial amounts of instruments, whose contract amounts represent credit risks, were outstanding: Commitments to extend credit $ 2,935,768,000 Credit card lines 21,114,000 Standby letters of credit 111,229,000 Commercial letters of credit 8,073,000 We enter into a standby letter of credit to guarantee performance of a customer to a third party. These guarantees are primarily issued to support public and private borrowing arrangements. The credit risk involved is represented by the contractual amounts of those instruments. Under the standby letters of credit, we are required to make payments to the beneficiary of the letters of credit upon request by the beneficiary so long as all performance criteria have been met. At December 31, 2018, the maximum potential amount of future payments is approximately $111,229,000. At December 31, 2018, the fair value of these guarantees is not significant. Unsecured letters of credit totaled approximately $42,729,000 and $35,409,000 at December 31, 2018 and 2017, respectively. We enter into commercial letters of credit on behalf of our customers which authorize a third party to draw drafts upon us up to a stipulated amount and with specific terms and conditions. A commercial letter of credit is a conditional commitment on our part to provide payment on drafts drawn in accordance with the terms of the commercial letter of credit. The Subsidiary Banks’ exposure to credit loss in the event of nonperformance by the other party to the above financial instruments is represented by the contractual amounts of the instruments. The Subsidiary Banks use the same credit policies in making commitments and conditional obligations as they do for on‑statement of condition instruments. The Subsidiary Banks control the credit risk of these transactions through credit approvals, limits and monitoring procedures. Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates normally less than one year or other termination clauses and may require the payment of a fee. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The Subsidiary Banks evaluate each customer’s credit‑worthiness on a case‑by‑case basis. The amount of collateral obtained, if deemed necessary by the Subsidiary Banks upon extension of credit, is based on management’s credit evaluation of the customer. Collateral held varies, but may include residential and commercial real estate, bank certificates of deposit, accounts receivable and inventory. The Subsidiary Banks make commercial, real estate and consumer loans to customers principally located in South, Central and Southeast Texas and the State of Oklahoma. Although the loan portfolio is diversified, a substantial portion of its debtors’ ability to honor their contracts is dependent upon the economic conditions in these areas, especially in the real estate and commercial business sectors.

Capital Requirements

Capital Requirements	12 Months Ended
	Dec. 31, 2018
Capital Requirements
Capital Requirements	(20) Capital Requirements On December 23, 2008, as part of the Troubled Asset Relief Program Capital Purchase Program of the United States Department of the Treasury (“Treasury”), we issued to the Treasury a warrant to purchase 1,326,238 shares of our common stock at a price per share of $24.43 and with a term of ten years (the “Warrant”). On June 12, 2013, the U.S. Treasury sold the Warrant to a third party. On September 19, 2018, we entered into an agreement to repurchase the Warrant from the third party at an aggregate purchase price of $29,005,000, which transaction was consummated in the third quarter of 2018. The repurchase of the outstanding Warrant eliminates any restrictions on certain shareholder distributions or payment of cash dividends in excess of $0.33 per semi-annual period that would have impacted the exercise price of the Warrant while it remained outstanding. Bank regulatory agencies limit the amount of dividends, which the Subsidiary Banks can pay, without obtaining prior approval from such agencies. At December 31, 2018, the Subsidiary Banks could pay dividends of up to $768,900,000 without prior regulatory approval and without adversely affecting their “well‑capitalized” status under regulatory capital rules in effect at December 31, 2018. In addition to legal requirements, regulatory authorities also consider the adequacy of the Subsidiary Banks’ total capital in relation to their deposits and other factors. These capital adequacy considerations also limit amounts available for payment of dividends. We historically have not allowed any Subsidiary Bank to pay dividends in such a manner as to impair its capital adequacy. We and the Subsidiary Banks are subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on our consolidated financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, we must meet specific capital guidelines that involve quantitative measures of our assets, liabilities, and certain off‑statement of condition items as calculated under regulatory accounting practices. Our capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings, and other factors. Current quantitative measures established by regulation to ensure capital adequacy require us to maintain minimum amounts and ratios (set forth in the table on the following page) of Total and Tier 1 capital to risk‑weighted assets and of Tier 1 capital to average assets. Management believes, as of December 31, 2018, that we met all capital adequacy requirements to which we are subject. 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). The aforementioned capital conservation buffer is designed to absorb losses during periods of economic stress. Banking institutions with a ratio of CET1 capital to risk-weighted assets above the minimum but below the conservation buffer will face constraints on dividends, equity repurchases and compensation based on the amount of the shortfall. As of December 31, 2018, our capital levels exceed all capital adequacy requirements under the Basel III Capital Rules as currently applicable to us. Based on the ratios presented below, capital levels as of December 31, 2018 exceed the minimum levels necessary to be considered “well capitalized.” 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. As of December 31, 2018, the most recent notification from the Federal Deposit Insurance Corporation categorized all the Subsidiary Banks as well‑capitalized under the regulatory framework for prompt corrective action. To be categorized as “well‑capitalized,” we must maintain minimum Total risk‑based, Tier 1 risk based, and Tier 1 leverage ratios as set forth in the table. There are no conditions or events since that notification that management believes have changed our categorization as well‑capitalized. In December 2018, the federal bank regulators issued a final rule that would provide an optional three-year phase-in period for the day-one regulatory capital effects of the adoption of ASU 2016-13 to ASC 326 “Financial Instruments – Credit Losses,” as amended, on January 1, 2020. Our actual capital amounts and ratios for 2018 under current guidelines are presented in the following table: For Capital Adequacy To Be Well-Capitalized Purposes Under Prompt Corrective Actual Phase In Schedule Action Provisions Amount Ratio Amount Ratio Amount Ratio (greater than (greater than (greater than (greater than or equal to) or equal to) or equal to) or equal to) (Dollars in Thousands) As of December 31, 2018: Common Equity Tier 1 (to Risk Weighted Assets): Consolidated $ 1,711,682 17.55 % $ 621,850 6.375 % N/A N/A International Bank of Commerce, Laredo 1,201,462 17.24 444,207 6.375 $ 452,917 % International Bank of Commerce, Oklahoma 188,997 13.95 86,344 6.375 88,037 International Bank of Commerce, Brownsville 177,456 24.73 45,741 6.375 46,638 International Bank of Commerce, Zapata 70,984 30.77 14,707 6.375 14,996 Commerce Bank 89,305 32.95 17,276 6.375 17,615 Total Capital (to Risk Weighted Assets): Consolidated $ 1,925,905 19.74 % $ 963,258 9.875 % N/A N/A International Bank of Commerce, Laredo 1,248,107 17.91 688,086 9.875 $ 696,796 % International Bank of Commerce, Oklahoma 198,293 14.64 133,749 9.875 135,442 International Bank of Commerce, Brownsville 183,554 25.58 70,854 9.875 71,750 International Bank of Commerce, Zapata 73,726 31.96 22,782 9.875 23,070 Commerce Bank 90,894 33.54 26,761 9.875 27,100 Tier 1 Capital (to Risk Weighted Assets): Consolidated $ 1,859,536 19.06 % $ 768,168 7.875 % N/A N/A International Bank of Commerce, Laredo 1,201,462 17.24 548,727 7.875 $ 557,437 % International Bank of Commerce, Oklahoma 188,997 13.95 106,660 7.875 108,354 International Bank of Commerce, Brownsville 177,456 24.73 56,503 7.875 57,400 International Bank of Commerce, Zapata 70,984 30.77 18,168 7.875 18,456 Commerce Bank 89,305 32.95 21,341 7.875 21,680 Tier 1 Capital (to Average Assets): Consolidated $ 1,859,536 15.87 % $ 468,593 % $ N/A N/A International Bank of Commerce, Laredo 1,201,462 14.45 332,507 415,634 % International Bank of Commerce, Oklahoma 188,997 12.53 60,344 75,430 International Bank of Commerce, Brownsville 177,456 17.25 41,144 51,430 International Bank of Commerce, Zapata 70,984 16.22 17,507 21,884 Commerce Bank 89,305 15.53 23,000 28,750 Our actual capital amounts and ratios for 2017 are also presented in the following table: To Be Well-Capitalized For Capital Adequacy Under Prompt Corrective Actual Purposes Action Provisions Amount Ratio Amount Ratio Amount Ratio (greater than (greater than (greater than (greater than or equal to) or equal to) or equal to) or equal to) (Dollars in Thousands) As of December 31, 2017: Common Equity Tier 1 (to Risk Weighted Assets): Consolidated $ 1,584,665 % $ 532,579 % N/A N/A International Bank of Commerce, Laredo 1,119,173 376,245 $ 425,320 % International Bank of Commerce, Oklahoma 169,279 72,586 82,054 International Bank of Commerce, Brownsville 165,034 36,583 41,355 International Bank of Commerce, Zapata 66,406 12,487 14,116 Commerce Bank 79,330 13,733 15,524 Total Capital (to Risk Weighted Assets): Consolidated $ 1,807,107 % $ 856,757 % N/A N/A % International Bank of Commerce, Laredo 1,173,068 605,263 $ 654,339 International Bank of Commerce, Oklahoma 178,057 116,769 126,237 International Bank of Commerce, Brownsville 170,613 58,851 63,623 International Bank of Commerce, Zapata 68,718 20,088 21,717 Commerce Bank 81,278 22,092 23,884 Tier 1 Capital (to Risk Weighted Assets): % Consolidated $ 1,734,595 % $ 671,512 % N/A N/A International Bank of Commerce, Laredo 1,119,173 474,395 $ 523,471 International Bank of Commerce, Oklahoma 169,279 91,521 100,989 International Bank of Commerce, Brownsville 165,034 46,127 50,899 International Bank of Commerce, Zapata 66,406 15,745 17,374 Commerce Bank 79,330 17,316 19,107 % Tier 1 Capital (to Average Assets): Consolidated $ 1,734,595 % $ 474,675 % $ N/A N/A International Bank of Commerce, Laredo 1,119,173 333,166 416,458 International Bank of Commerce, Oklahoma 169,279 59,854 74,818 International Bank of Commerce, Brownsville 165,034 38,440 48,050 International Bank of Commerce, Zapata 66,406 18,701 23,376 Commerce Bank 79,330 21,789 27,236

Fair Value

Fair Value	12 Months Ended
	Dec. 31, 2018
Fair Value
Fair Value	(21) Fair Value ASC Topic 820, “Fair Value Measurements and Disclosures” (“ASC 820”) defines fair value, establishes a framework for measuring fair value in generally accepted accounting principles, and expands disclosures about fair value measurements. ASC 820 applies to all financial instruments that are being measured and reported on a fair value basis. ASC 820 defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date; it also establishes a fair value hierarchy that prioritizes the inputs used in valuation methodologies into the following three levels: · Level 1 Inputs—Unadjusted quoted prices in active markets for identical assets or liabilities. · Level 2 Inputs—Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. · Level 3 Inputs—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Level 3 assets and liabilities include financial instruments whose value is determined using pricing models, discounted cash flow methodologies, or other valuation techniques, as well as instruments for which the determination of fair value requires significant management judgment or estimation. A description of the valuation methodologies used for instruments measured at fair value, as well as the general classification of such instruments pursuant to the valuation hierarchy is set forth below. The following table represents financial instruments reported on the consolidated statements of condition at their fair value as of December 31, 2018 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, 2018 (Level 1) (Level 2) (Level 3) Measured on a recurring basis: Assets: Available for sale debt securities Residential mortgage-backed securities $ 3,223,010 $ — $ 3,223,010 $ — States and political subdivisions 188,340 — 188,340 — Equity securities with readily determinable fair values 5,937 5,937 — — $ 3,417,287 $ 5,937 $ 3,411,350 $ — The following table represents financial instruments reported on the consolidated balance sheets at their fair value as of December 31, 2017 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, 2017 (Level 1) (Level 2) (Level 3) Measured on a recurring basis: Assets: Available for sale securities Residential mortgage - backed securities $ 3,891,233 $ — $ 3,891,233 $ — States and political subdivisions 232,951 — 232,951 — Equity securities with readily determinable fair values 27,886 27,886 — — $ 4,152,070 $ 27,886 $ 4,124,184 $ — For the years ended December 31, 2018 and December 31, 2017, debt investment securities available‑for‑sale are classified within Level 2 of the valuation hierarchy. Equity securities with readily determinable fair values are classified within Level 1. For debt securities classified as Level 2 in the fair value hierarchy, we obtain fair value measurements from an independent pricing service. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the bond’s terms and conditions, among other things. Certain financial instruments are measured at fair value on a nonrecurring basis. They are not measured at fair value on an ongoing basis but are subject to fair value adjustments in certain circumstances (for example, when there is evidence of impairment). The following table represents financial instruments measured at fair value on a non‑recurring basis as of and for the period ended December 31, 2018 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 Year ended Identical Observable Unobservable (Credit) December 31, Assets Inputs Inputs During 2018 (Level 1) (Level 2) (Level 3) Period Measured on a non-recurring basis: Assets: Impaired loans $ 1,563 $ — $ — $ 1,563 $ 356 Other real estate owned 38,871 — — 38,871 3,071 The following table represents financial instruments measured at fair value on a non‑recurring basis as of and for the year ended December 31, 2017 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 2017 (Level 1) (Level 2) (Level 3) Period Measured on a non-recurring basis: Assets: Impaired loans $ 11,210 $ — $ — $ 11,210 $ 2,138 Other real estate owned 2,000 — — 2,000 710 Our assets measured at fair value on a non-recurring basis are limited to impaired loans and other real estate owned. Impaired loans are classified within Level 3 of the valuation hierarchy. The fair value of impaired loans is derived in accordance with FASB ASC 310, “Receivables”. Impaired loans are primarily comprised of collateral-dependent commercial loans. Understanding that as the primary sources of loan repayments decline, the secondary repayment source comes into play and correctly evaluating the fair value of that secondary source, the collateral, becomes even more important. Re-measurement of the impaired loan to fair value is done through a specific valuation allowance included in the allowance for probable loan losses. The fair value of impaired loans is based on the fair value of the collateral, as determined through either an appraisal or evaluation process. The basis for our appraisal and appraisal review process is based on regulatory guidelines and strives to comply with all regulatory appraisal laws, regulations and the Uniform Standards of Professional Appraisal Practice. All appraisals and evaluations are “as is” (the property’s highest and best use) valuations based on the current conditions of the property/project at that point in time. The determination of the fair value of the collateral is based on the net realizable value, which is the appraised value less any closing costs, when applicable. As of December 31, 2018, we had approximately $14,306,000 of impaired commercial collateral dependent loans, of which approximately $10,911,000 had an appraisal performed within the immediately preceding twelve months and of which approximately $0 had an evaluation performed within the immediately preceding twelve months. As of December 31, 2017, we had approximately $53,267,000 of impaired commercial collateral dependent loans, of which approximately $18,585,000 had an appraisal performed within the immediately preceding twelve months and of which approximately $0 had an evaluation performed within the immediately preceding twelve months. The determination to either seek an appraisal or to perform an evaluation begins in weekly credit quality meetings, where the committee analyzes the existing collateral values of the impaired loans and where obsolete appraisals are identified. In order to determine whether we would obtain a new appraisal or perform an internal evaluation to determine the fair value of the collateral, the credit committee reviews the existing appraisal to determine if the collateral value is reasonable in view of the current use of the collateral and the economic environment related to the collateral. If the analysis of the existing appraisal does not find that the collateral value is reasonable under the current circumstances, we would obtain a new appraisal on the collateral or perform an internal evaluation of the collateral. The ultimate decision to get a new appraisal rests with the independent credit administration group. A new appraisal is not required if an internal evaluation, as performed by in-house experts, is able to appropriately update the original appraisal assumptions to reflect current market conditions and provide an estimate of the collateral’s market value for impairment analysis. The internal evaluations must be in writing and contain sufficient information detailing the analysis, assumptions and conclusions and they must support performing an evaluation in lieu of ordering a new appraisal. Other real estate owned is comprised of real estate acquired by foreclosure and deeds in lieu of foreclosure. Other real estate owned is carried at the lower of the recorded investment in the property or its fair value less estimated costs to sell such property (as determined by independent appraisal) within Level 3 of the fair value hierarchy. Prior to foreclosure, the value of the underlying loan is written down to the fair value of the real estate to be acquired by a charge to the allowance for probable loan losses, if necessary. The fair value is reviewed periodically and subsequent write downs are made accordingly through a charge to operations. Other real estate owned is included in other assets on the consolidated financial statements. For the twelve months ended December 31, 2018, December 31, 2017 and December 31, 2016, respectively we recorded approximately $170,000, $30,000 and $381,000 in charges to the allowance for probable loan losses in connection with loans transferred to other real estate owned. For the twelve months ended December 31, 2018, December 31, 2017 and December 31, 2016, respectively, we recorded approximately $3,071,000, $710,000 and $2,351,000 in adjustments to fair value in connection with other real estate owned. The fair value estimates, methods, and assumptions for our financial instruments at December 31, 2018 and December 31, 2017 are outlined below. Cash and Cash Equivalents For these short‑term instruments, the carrying amount is a reasonable estimate of fair value. Investment securities held‑to‑maturity The carrying amounts of investments held‑to‑maturity approximate fair value. Investment Securities For debt investment securities, which include U.S. Treasury securities, obligations of other U.S. government agencies, obligations of states and political subdivisions and mortgage pass through and related securities, fair values are from an independent pricing service. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the bond’s terms and conditions, among other things. See disclosures of fair value of investment securities in Note 2. Loans Fair values are estimated for portfolios of loans with similar financial characteristics. Loans are segregated by type such as commercial, real estate and consumer loans as outlined by regulatory reporting guidelines. Each category is segmented into fixed and variable interest rate terms and by performing and non‑performing categories. For variable rate performing loans, the carrying amount approximates the fair value. For fixed rate performing loans, except residential mortgage loans, the fair value is calculated by discounting scheduled cash flows through the estimated maturity using estimated market discount rates that reflect the credit and interest rate risk inherent in the loan. For performing residential mortgage loans, fair value is estimated by discounting contractual cash flows adjusted for prepayment estimates using discount rates based on secondary market sources or the primary origination market. Fixed rate performing loans are within Level 3 of the fair value hierarchy. At December 31, 2018 and December 31, 2017, the carrying amount of fixed rate performing loans was $1,515,437,000 and $1,505,531,000, respectively, and the estimated fair value was $1,469,231,000 and $1,454,434,000, respectively. Accrued Interest The carrying amounts of accrued interest approximate fair value. Deposits The fair value of deposits with no stated maturity, such as non‑interest bearing demand deposit accounts, savings accounts and interest bearing demand deposit accounts, was equal to the amount payable on demand as of December 31, 2018 and December 31, 2017. The fair value of time deposits is based on the discounted value of contractual cash flows. The discount rate is based on currently offered rates. Time deposits are within Level 3 of the fair value hierarchy. At December 31, 2018 and December 31, 2017, the carrying amount of time deposits was $1,973,468,000 and $2,056,506,000, respectively, and the estimated fair value was $1,976,156,000 and $2,058,621,000, respectively. Securities Sold Under Repurchase Agreements Securities sold under repurchase agreements include both short and long‑term maturities. Due to the contractual terms of the short‑term instruments, the carrying amounts approximated fair value at December 31, 2018 and December 31, 2017. The fair value of the long‑term instruments is based on established market spread using option adjusted spread methodology. Long‑term repurchase agreements are within Level 3 of the fair value hierarchy. The only remaining long-term repurchase agreement outstanding matured in the first quarter of 2018 and was not renewed. At December 31, 2017 the carrying amount of long‑term repurchase agreements was $100,000,000 and the estimated fair value was $99,504,000. Junior Subordinated Deferrable Interest Debentures We currently have floating rate junior subordinated deferrable interest debentures outstanding. Due to the contractual terms of the floating rate junior subordinated deferrable interest debentures, the carrying amounts approximated fair value at December 31, 2018 and December 31, 2017. Other Borrowed Funds We currently have short and long‑term borrowings issued from the Federal Home Loan Bank (“FHLB”). Due to the contractual terms of the short‑term borrowings, the carrying amounts approximated fair value at December 31, 2018 and December 31, 2017. The long-term borrowings outstanding at December 31, 2018 and December 31, 2017 are fixed-rate borrowings and the fair value is based on established market spreads for similar types of borrowings. The fixed-rate long-term borrowings are included in Level 2 of the fair value hierarchy. At December 31, 2018, and December 31, 2017 the carrying amount of the fixed-rate long-term FHLB borrowings was $436,690,000 and $250,000,000, respectively and the estimated fair value was $436,238,000 and $249,728,000 respectively. Commitments to Extend Credit and Letters of Credit Commitments to extend credit and fund letters of credit are principally at current interest rates and therefore the carrying amount approximates fair value. Limitations Fair value estimates are made at a point in time, based on relevant market information and information about the financial instrument. These estimates do not reflect any premium or discount that could result from offering for sale at one time of our entire holdings of a particular financial instrument. Because no market exists for a significant portion of our financial instruments, fair value estimates are based on judgments regarding future expected loss experience, current economic conditions, risk characteristics of various financial instruments and other factors. These estimates are subjective in nature and involve uncertainties and matters of significant judgment and therefore cannot be determined with precision. Changes in assumptions could significantly affect the estimates. Fair value estimates are based on existing on‑and off‑statement of condition financial instruments without attempting to estimate the value of anticipated future business and the value of assets and liabilities that are not considered financial instruments. Other significant assets and liabilities that are not considered financial assets or liabilities include the bank premises and equipment and core deposit value. In addition, the tax ramifications related to the effect of fair value estimates have not been considered in the above estimates.

International Bancshares Corpor

International Bancshares Corporation (Parent Company Only) Financial Information Statements of Condition	12 Months Ended
	Dec. 31, 2018
International Bancshares Corporation (Parent Company Only) Financial Information Statements of Condition
International Bancshares Corporation (Parent Company Only) Financial Information Statements of Condition	(22) International Bancshares Corporation (Parent Company Only) Financial Information Statements of Condition (Parent Company Only) December 31, 2018 and 2017 (Dollars in Thousands) 2018 2017 ASSETS Cash $ 19,065 $ 18,398 Other investments 105,377 92,620 Investment in subsidiaries 1,987,293 1,878,521 Other assets — 23,120 Total assets $ 2,111,735 $ 2,012,659 LIABILITIES AND SHAREHOLDERS’ EQUITY Liabilities: Junior subordinated deferrable interest debentures $ 160,416 $ 160,416 Due to IBC Trading 21 21 Other liabilities 11,716 13,242 Total liabilities 172,153 173,679 Shareholders’ equity: Common shares 96,104 96,019 Surplus 145,283 171,816 Retained earnings 2,064,134 1,891,805 Accumulated other comprehensive (loss) income (54,634) (28,397) 2,250,887 2,131,243 Less cost of shares in treasury (311,305) (292,263) Total shareholders’ equity 1,939,582 1,838,980 Total liabilities and shareholders’ equity $ 2,111,735 $ 2,012,659

International Bancshares Corp_2

International Bancshares Corporation (Parent Company Only) Financial Information Statements of Income	12 Months Ended
	Dec. 31, 2018
International Bancshares Corporation (Parent Company Only) Financial Information Statements of Income
International Bancshares Corporation (Parent Company Only) Financial Information Statements of Income	(23) International Bancshares Corporation (Parent Company Only) Financial Information Statements of Income (Parent Company Only) Years ended December 31, 2018, 2017 and 2016 (Dollars in Thousands) 2018 2017 2016 Income: Dividends from subsidiaries $ 105,000 $ 64,600 $ 84,432 Interest income on notes receivable — — 2 Interest income on other investments 8,208 8,100 8,958 Other 1,988 26 255 Total income 115,196 72,726 93,647 Expenses: Interest expense (Debentures) 6,989 5,392 4,600 Other 2,930 5,648 3,637 Total expenses 9,919 11,040 8,237 Income before federal income taxes and equity in undistributed net income of subsidiaries 105,277 61,686 85,410 Income tax expense 481 (2,076) 311 Income before equity in undistributed net income of subsidiaries 104,796 63,762 85,099 Equity in undistributed net income of subsidiaries 111,135 93,674 48,833 Net income $ 215,931 $ 157,436 $ 133,932

International Bancshares Corp_3

International Bancshares Corporation (Parent Company Only) Financial Information Statements of Cash Flows	12 Months Ended
	Dec. 31, 2018
International Bancshares Corporation (Parent Company Only) Financial Information Statements of Cash Flows
International Bancshares Corporation (Parent Company Only) Financial Information Statements of Cash Flows	(24) International Bancshares Corporation (Parent Company Only) Financial Information Statements of Cash Flows (Parent Company Only) Years ended December 31, 2018, 2017 and 2016 (Dollars in Thousands) 2018 2017 2016 Operating activities: Net income $ 215,931 $ 157,436 $ 133,932 Adjustments to reconcile net income to net cash provided by operating activities: Investment securities transactions, net — (23) — Unrealized loss on equity securities with readily determinable fair values 330 — — Impairment charges on available for sale securities — — 112 Stock compensation expense 1,035 903 1,082 (Decrease) increase in other liabilities (1,479) (3,453) 3,901 Equity in undistributed net income of subsidiaries (111,135) (93,674) (48,833) Net cash provided by operating activities 104,682 61,189 90,194 Investing activities: Principal collected on mortgage-backed securities — 6,328 1,105 Net decrease in notes receivable — — 99 Increase in other assets and other investments (7,891) (25,348) (27,834) Net cash used in investing activities (7,891) (19,020) (26,630) Financing activities: Redemption of long-term debt — — (1,000) Proceeds from stock transactions 1,522 1,455 549 Payments of cash dividends - common (49,599) (43,594) (39,569) Repurchase of outstanding common stock warrant (29,005) — — Purchase of treasury stock (19,042) (187) (7,966) Net cash used in financing activities (96,124) (42,326) (47,986) Increase (decrease) in cash 667 (157) 15,578 Cash at beginning of year 18,398 18,555 2,977 Cash at end of year $ 19,065 $ 18,398 $ 18,555

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2018
Summary of Significant Accounting Policies
Consolidation and Basis of Presentation	Consolidation and Basis of Presentation Our consolidated financial statements include the accounts of the International Bancshares Corporation, its wholly-owned Subsidiary Banks and its wholly-owned non-bank subsidiaries, IBC Subsidiary Corporation, IBC Trading Company, Premier Tierra Holdings, Inc., IBC Charitable and Community Development Corporation, and IBC Capital Corporation. All significant inter-company balances and transactions have been eliminated in consolidation. We, through our Subsidiary Banks, are primarily engaged in the business of banking, including the acceptance of checking and savings deposits and the making of commercial, real estate, personal, home improvement, automobile and other installment and term loans. Our primary markets are north, south, central, and southeast Texas and the state of Oklahoma. Each of our Subsidiary Banks is very active in facilitating international trade along the United States border with Mexico and elsewhere. Although our loan portfolio is diversified, the ability of our debtors to honor their contracts is primarily dependent upon the economic conditions in our trade area. In addition, the investment portfolio is directly impacted by fluctuations in market interest rates. We are subject to the regulations of certain federal agencies as well as the Texas Department of Banking and the Oklahoma Department of Banking and undergo periodic examinations by those regulatory authorities. Such agencies may require certain standards or impose certain limitations based on their judgments or changes in law and regulations. We own one insurance‑related subsidiary, IBC Insurance Agency, Inc., a wholly owned subsidiary of our Subsidiary Bank, International Bank of Commerce, Laredo. The insurance‑related subsidiary does not conduct underwriting activities. The preparation of the consolidated financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the dates of the statement of condition and income and expenses for the periods. Actual results could differ significantly from those estimates. Material estimates that are particularly susceptible to significant changes in the near‑term relate to the determination of the allowance for probable loan losses.
Subsequent Events	Subsequent Events We have evaluated all events or transactions that occurred through the date we issued these financial statements. During this period, we did not have any material recognizable or non‑recognizable subsequent events.
Investment Securities	Investment Securities We classify debt securities into one of these categories: held‑to‑maturity, available‑for‑sale, or trading. Such classifications are reassessed for appropriate classification at each reporting date. Securities that are intended and expected to be held until maturity are classified as “held‑to‑maturity” and are carried at amortized cost for financial statement reporting. Securities that are not positively expected to be held until maturity, but are intended to be held for an indefinite period of time are classified as “available‑for‑sale” or “trading” and are carried at their fair value. Unrealized holding gains and losses are included in net income for those securities classified as “trading”, while unrealized holding gains and losses related to those securities classified as “available‑for‑sale” are excluded from net income and reported net of tax as other comprehensive income and in shareholders’ equity as accumulated other comprehensive income (loss) until realized. We did not maintain any trading securities during the three-year period ended December 31, 2018. Mortgage‑backed securities held at December 31, 2018 and 2017 represent participating interests in pools of long‑term first mortgage loans originated and serviced by the issuers of the securities. Mortgage‑backed securities are either issued or guaranteed by the U.S. government or its agencies including the Federal Home Loan Mortgage Corporation (“Freddie Mac”), the Federal National Mortgage Association (“Fannie Mae”), the Government National Mortgage Association (“Ginnie Mae”) or other non‑government entities. Investments in residential mortgage‑backed securities issued by Ginnie Mae are fully guaranteed by the U. S. government. Investments in residential mortgage‑backed securities issued by Freddie Mac and Fannie Mae are not fully guaranteed by the U.S. government; however, we believe that the quality of the bonds is similar to other AAA rated bonds with limited credit risk, particularly given the placement of Fannie Mae and Freddie Mac into conservatorship by the federal government in 2008 and because securities issued by others that are collateralized by residential mortgage‑backed securities issued by Fannie Mae or Freddie Mac are rated consistently as AAA rated securities. Market interest rate fluctuations can affect the prepayment speed of principal and the yield on the security. Premiums and discounts are amortized using the level yield or “interest method” over the terms of the securities. Declines in the fair value of held‑to‑maturity and available‑for sale‑securities below their cost that are deemed to be other than temporary are reflected in earnings as realized losses. In determining whether other‑than‑temporary impairment exists, management considers many factors, including (i) the length of time and the extent to which the fair value has been less than cost, (ii) the financial condition and near‑term prospects of the issuer, and (iii) our intent to hold and our determination of whether we will more likely than not be required to sell the security prior to a recovery in fair value. If we determine that (i) we intend to sell the security or (ii) it is more likely than not that we will be required to sell the security before it’s anticipated recovery, the other‑than‑temporary impairment that is recognized in earnings is equal to the difference between the fair value of the security and our amortized cost of the security. If we determine that we (i) do not intend to sell the security and (ii) we will not be more likely than not required to sell the security before it’s anticipated recovery, the other‑than‑temporary impairment is segregated into its two components (i) the amount of impairment related to credit loss and (ii) the amount of impairment related to other factors. The difference between the present value of the cash flows expected to be collected and the amortized cost is the credit loss recognized through earnings and an adjustment to the cost basis of the security. The amount of impairment related to other factors is included in other comprehensive income (loss). Gains and losses on the sale of securities are recorded on the trade date and are determined using the specific identification method. Equity Securities Prior to January 1, 2018, equity securities with readily determinable fair values were included in available-for-sale securities, with the unrealized gain or loss recorded as a component of other comprehensive income (loss). Pursuant to the adoption of ASU 2016-02, equity securities with readily determinable fair values are a separate component of our balance sheet, with unrealized gains and losses recognized in net income. Equity securities with readily determinable fair values at December 31, 2018 and December 31, 2017 consist primarily of Community Reinvestment Act funds.
Provision and Allowance for Probable Loan Losses	Provision and Allowance for Probable Loan Losses The allowance for probable loan losses is maintained at a level considered adequate by management to provide for probable loan losses. The allowance is increased by provisions charged to operating expense and reduced by net charge‑offs. The provision for probable loan losses is the amount, which, in the judgment of management, is necessary to establish the allowance for probable loan losses at a level that is adequate to absorb known and inherent risks in the loan portfolio. Management believes that the allowance for probable loan losses is adequate. While management uses available information to recognize losses on loans, future additions to the allowance may be necessary based on changes in economic conditions. In addition, various regulatory agencies, as an integral part of their examination process, periodically review our Subsidiary Banks’ allowances for probable loan losses. Such agencies may require our Subsidiary Banks to make additions or reductions to their GAAP allowances based on their judgments of information available to them at the time of their examination. The Subsidiary Banks charge-off that portion of any loan which management considers to represent a loss as well as that portion of any other loan which is classified as a “loss” by bank examiners. Commercial, financial and agricultural or real estate loans are generally considered by management to represent a loss, in whole or part, (i) when an exposure beyond any collateral coverage is apparent, (ii) when no further collection of the portion of the loan so exposed is anticipated based on actual results, (iii) when the credit enhancements, if any, are not adequate, and (iv) when the borrower’s financial condition would indicate so. Generally, unsecured consumer loans are charged-off when 90 days past due.
Loans	Loans Loans are reported at the principal balance outstanding, net of unearned discounts. Interest income on loans is reported on an accrual basis. Loan fees and costs associated with originating the loans are accreted or amortized over the life of the loan using the interest method. We originate mortgage loans that may subsequently be sold to an unaffiliated third party. The loans are not securitized and if sold, are sold without recourse. Loans held for sale are carried at cost and the principal amount outstanding is not significant to the consolidated financial statements.
Impaired Loans	Impaired Loans Impaired loans are those loans where it is probable that all amounts due according to contractual terms of the loan agreement will not be collected. Impaired loans are measured based on (1) the present value of expected future cash flows discounted at the loan’s effective interest rate; (2) the loan’s observable market price; or (3) the fair value of the collateral if the loan is collateral dependent. Substantially all our impaired loans are measured at the fair value of the collateral. In limited cases, we may use other methods to determine the level of impairment of a loan if such loan is not collateral dependent.
Troubled Debt Restructured Loans	Troubled Debt Restructured Loans Troubled debt restructured loans (“TDR”) are those loans where, for reasons related to a borrower’s difficulty to repay a loan, we grant a concession to the borrower that we would not normally consider in the normal course of business. The original terms of the loan are modified or restructured. The terms that may be modified include a reduction in the original stated interest rate, an extension of the original maturity of the loan, a renewal of the loan at an interest rate below current market rates, a reduction in the principal amount of debt outstanding, a reduction in accrued interest or deferral of interest payments. A loan classified as a TDR is classified as an impaired loan and included in the impaired loan totals. A TDR loan may be returned to accrual status when the loan is brought current, has performed in accordance with the restructured terms for a reasonable period of time, is at the current market rate, and the ultimate collectability of the outstanding principal and interest is no longer questionable, however, although those loans may be placed back on accrual status, they will continue to be classified as impaired. Consistent with regulatory guidance, a TDR loan that is subsequently modified, but has shown sustained performance and classification as a TDR, will be removed from TDR status provided that the modified terms were market-based at the time of modification.
Non-Accrual Loans	Non‑Accrual Loans The non‑accrual loan policy of our Subsidiary Banks is to discontinue the accrual of interest on loans when management determines that it is probable that future interest accruals will be un‑collectible. As it relates to consumer loans, management charges-off those loans when the loan is contractually 90 days past due. Under special circumstances, a consumer or non‑consumer loan may be more than 90 days delinquent as to interest or principal and not be placed on non‑accrual status. This situation generally results when a Subsidiary Bank has a borrower who is experiencing financial difficulties, but not to the extent that requires a restructuring of indebtedness. The majority of this category is composed of loans that are considered to be adequately secured and/or for which there are expected future payments. When a loan is placed on non‑accrual status, any interest accrued, not paid is reversed and charged to operations against interest income. As it relates to non‑consumer loans that are not 90 days past due, management will evaluate each of these loans to determine if placing the loan on non‑accrual status is warranted. Interest income on non‑accrual loans is recognized only to the extent payments are received or when, in management’s opinion, the debtor’s financial condition warrants reestablishment of interest accruals.
Other Real Estate Owned and Reposessed Assets	Other Real Estate Owned and Reposessed Assets Other real estate owned is comprised of real estate acquired by foreclosure and deeds in lieu of foreclosure. Other real estate is carried at the lower of the recorded investment in the property or its fair value less estimated costs to sell such property (as determined by independent appraisal). Prior to foreclosure, the value of the underlying loan is written down to the fair value of the real estate to be acquired by a charge to the allowance for probable loan losses, if necessary. Any subsequent write‑downs are charged against other non‑interest expense through a valuation allowance. Other real estate owned totaled approximately $57,344,000 and $30,519,000 at December 31, 2018 and 2017, respectively. Other real estate owned is included in other assets. Reposessed assets consist primarily of non-real estate assets acquired by foreclosure. Prior to foreclosure, the value of the underlying loan is written down to the fair value of the asset to be repossessed by a charge to the allowance for probable loan losses, if necessary. Reposessed assets are included in other assets on the consolidated financial statements and totaled approximately $6,454,000 and $303,000 at December 31, 2018 and 2017, respectively.
Bank Premises and Equipment	Bank Premises and Equipment Bank premises and equipment are stated at cost less accumulated depreciation. Depreciation is computed on straight‑line and accelerated methods over the estimated useful lives of the assets. Repairs and maintenance are charged to operations as incurred and expenditures for renewals and betterments are capitalized.
Other Investments	Other Investments Other investments include equity investments in non‑financial companies, as well as equity securities with no readily determinable fair market value. Equity investments are accounted for using the equity method of accounting. Equity securities with no readily determinable fair value are accounted for using the cost method.
Cash Surrender Value of Bank Owned Life Insurance	Cash Surrender Value of Bank Owned Life Insurance Cash surrender value of bank owned life insurance includes investments in cash value insurance policies to assist with financing employee compensation and benefit programs. The cash value of the underlying policies accumulates on a tax-free basis and is received through death proceeds, which are also tax-free. The earnings on the policies are derived from the investment portfolio returns of the individual insurance carriers for general account policies and on the returns on investments segregated in our name for separate account policies.
Revenue recognition	Revenue Recognition On January 1, 2018, we adopted the provisions of ASU 2014-09 to ASC 606, “Revenue from Contracts with Customers.” Since our revenue is primarily comprised of net interest income on financial assets and liabilities, which were excluded from the scope of the update, the remaining non-interest revenue streams were identified and then analyzed under the provisions of the update, to: (i) indentify the contract, (ii) identify the performance obligation, (iii) determine the transaction price, (iv) allocate the transaction price to the performance obligations, and (v) recognize revenue when the performance obligation was satisfied. Our non-interest revenue contracts with customers are primarily short term and our performance obligation is satisfied at a single point in time, typically within a single period. No changes to our existing methods for recognizing revenue were made as a result of the update.
Income Taxes	Income Taxes Deferred income tax assets and liabilities are determined using the asset and liability method. Under this method, the net deferred tax asset or liability is determined based on the tax effects of the differences between the book and tax basis of the various balance sheet assets and liabilities and gives current recognition to changes in tax rates and laws. We file a consolidated federal income tax return with our subsidiaries. Recognition of deferred tax assets is based on management’s assessment that the benefit related to certain temporary differences, tax operating loss carry forwards, and tax credits are more likely than not to be realized. A valuation allowance is recorded for the amount of the deferred tax items for which it is more likely than not that the tax benefits will not be realized. We evaluate uncertain tax positions at the end of each reporting period. We may recognize the tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. The tax benefit recognized in the financial statements from any such a position is measured based on the largest benefit that has a greater than fifty percent likelihood of being realized upon ultimate settlement. As of December 31, 2018 and 2017, respectively, after evaluating all uncertain tax positions, we have recorded no liability for unrecognized tax benefits at the end of the reporting period. We would recognize any interest accrued on unrecognized tax benefits as other interest expense and penalties as other non‑interest expense. During the years ended December 31, 2018, 2017 and 2016, we recognized no interest expense or penalties related to uncertain tax positions. We file consolidated tax returns in the U.S. Federal jurisdiction and various state jurisdictions. We are no longer subject to U.S. federal or state income tax examinations by tax authorities for years before 2015.
Stock Options	Stock Options Compensation expense for stock awards is based on the market price of the stock on the measurement date, which is generally the date of grant, and is recognized ratably over the service period of the award. The fair value of stock options granted was estimated using the Black‑Sholes‑Merton option‑pricing model. This model was developed for use in estimating the fair value of publicly traded options that have no vesting restrictions and are fully transferable. Additionally, the model requires the input of highly subjective assumptions. Because our employee stock options have characteristics significantly different from those of publicly traded options, and because changes in the subjective input assumptions can materially affect the fair value estimate, in management’s opinion, the Black‑Scholes‑Merton option‑pricing model does not necessarily provide a reliable single measure of the fair value of our stock options.
Net Income Per Share	Net Income Per Share Basic Earnings Per Share (“EPS”) is calculated by dividing net income by the weighted average number of common shares outstanding. The computation of diluted EPS assumes the issuance of common shares for all dilutive potential common shares outstanding during the reporting period. The dilutive effect of stock options is considered in earnings per share calculations, if dilutive, using the treasury stock method.
Goodwill and Identified Intangible Assets	Goodwill and Identified Intangible Assets Goodwill represents the excess of costs over fair value of assets of businesses acquired. Goodwill is tested for impairment at least annually or on an interim basis if an event triggering impairment may have occurred. As of October 1, 2018, after completing goodwill testing, we have determined that no goodwill impairment exists. Identified intangible assets are acquired assets that lack physical substance but can be distinguished from goodwill because of contractual or other legal rights or because the asset is capable of being sold or exchanged either on its own or in combination with a related contract, asset, or liability. Our identified intangible assets relate to core deposits and contract rights. As of December 31, 2018, we have determined that no impairment of identified intangibles exists. Identified intangible assets with definite useful lives are amortized on an accelerated basis over their estimated life. See Note 6—Goodwill and Other Intangible Assets.
Impairment of Long-Lived Assets	Impairment of Long‑Lived Assets Long‑lived assets, such as property, plant and equipment, and purchased intangibles subject to amortization, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying value of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying value of the asset to the estimated undiscounted future cash flows expected to be generated by the asset. If the carrying value of an asset exceeds its estimated future cash flows, an impairment charge is recognized by the amount by which the carrying value of the asset exceeds the fair value of the asset. Assets to be disposed of would be separately presented in the statement of condition and reported at the lower of the carrying value or fair value less costs to sell, and are no longer depreciated. The assets and liabilities of a disposed group classified as held for sale would be presented separately in the appropriate asset and liability sections of the statement of condition.
Consolidated Statements of Cash Flows	Consolidated Statements of Cash Flows For purposes of the consolidated statements of cash flows, we consider all short‑term investments with a maturity at date of purchase of three months or less to be cash equivalents. Also, we report transactions related to deposits and loans to customers on a net basis.
Accounting for Transfers and Servicing of Financial Assets	Accounting for Transfers and Servicing of Financial Assets We account for transfers and servicing of financial assets and extinguishments of liabilities based on the application of a financial‑components approach that focuses on control. After a transfer of financial assets, we recognize the financial and servicing assets we control and liabilities we have incurred, derecognize financial assets when control has been surrendered and derecognize liabilities when extinguished. We have retained mortgage servicing rights in connection with the sale of mortgage loans. Because we may not initially identify loans as originated for resale, all loans are initially treated as held for investment. The value of the mortgage servicing rights are reviewed periodically for impairment and are amortized in proportion to, and over the period of estimated net servicing income or net servicing losses. The value of the mortgage servicing rights is not significant to the consolidated statements of condition.
Segments of an Enterprise and Related Information	Segments of an Enterprise and Related Information We operate as one segment. The operating information used by our chief executive officer for purposes of assessing performance and making operating decisions is the consolidated financial statements presented in this report. We have five active operating subsidiaries, namely, the Subsidiary Banks. We apply the provisions of ASC Topic 280, “Segment Reporting,” in determining our reportable segments and related disclosures.
Comprehensive Income (Loss)	Comprehensive Income (Loss) Comprehensive income (loss) consists of net income and other comprehensive income (loss). Other comprehensive income (loss) includes unrealized gains and losses on securities available for sale.
Advertising	Advertising Advertising costs are expensed as incurred.
Reclassifications	Reclassifications Certain amounts in the prior year’s presentations have been reclassified to conform to the current presentation. These reclassifications had no effect on previously reported net income or shareholders’ equity.
New Accounting Standards	New Accounting Standards In May 2014, the FASB issued Accounting Standards Update No. 2014-09 to ASC 606, “Revenue from Contracts with Customers.” The update sets a common standard that defines revenue and the principles for recognizing revenue. The update outlines when an entity should recognize revenue, among other matters. At its core, the update states that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for those goods or services. The update also outlines the steps that entities should take to determine and record the current revenue number including: (i) identify the contract(s) with a customer, (ii) identify the performance obligations in the contract(s), (iii) determine the transaction price, (iv) allocate the transaction price to the performance obligations in the contract(s), and (v) recognize revenue when (or as) the entity satisfies the identified performance obligations in the contract(s). The update was originally effective for annual periods beginning after December 31, 2016 and the interim periods within that reporting period. In August 2015, the FASB issued Accounting Standards Update No. 2015-14 which deferred the effective date of ASU 2014-09 by one year to annual and interim periods beginning after December 15, 2017. On January 1, 2018, we adopted the provisions of ASU 2014-09 to ASC 606. Our revenue is primarily comprised of net interest income on financial assets and financial liabilities, which is explicitly excluded from the scope of ASC 606. We have evaluated the impact of the accounting standards update on certain other non-interest revenue streams that the provisions of the update apply to and has determined that the adoption of the new provisions to ASC 606 did not have a significant impact to our consolidated financial statements or operations. In January 2016, the FASB issued Accounting Standards Update No. 2016-01 to ASC 825-10, “Financial Instruments – Overall.” The update amends existing standards regarding certain aspects of recognition and measurement of financial assets and financial liabilities. The amendments in the update establish the following guidance: (i) requires equity investments, except those accounted for under the equity method of accounting or those that result in consolidation of the investee, to be measured at fair value with changes in fair value recognized in net income, (ii) simplifies the impairment assessment of equity securities without readily determinable fair values by requiring a qualitative assessment, (iii) eliminates the requirement to disclose the fair value of financial instruments measured at amortized cost for entities that are not public business entities, (iv) eliminates the requirement for public business entities to disclose the methods and significant assumptions used to estimate fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet, (v) requires public business entities to use the exit price notion when measuring fair value for disclosure purposes, (vi) requires an entity to present separately, in other comprehensive income, the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option, (vii) requires separate presentation of financial assets and liabilities by measurement category and form of financial assets on the balance sheet or in the accompanying notes to the financial statements, and (viii) clarifies that an entity should evaluate the need to a valuation allowance on a deferred tax asset related to available-for-sale securities in combination with the entity’s other deferred tax assets. The update is effective for interim and annual periods beginning after December 15, 2017. On January 1, 2018, we adopted the provisions of ASU 2016-01 The main effect resulting from the adoption of the new standards is that beginning on January 1, 2018, equity securities with readily determinable fair values are now reported in a single line item on the face of our consolidated statement of condition under the caption, “Equity securities with readily determinable fair values.” Additionally, the changes in fair value of the equity securities is now recognized in net income and is included in other non-interest expense on the face of our consolidated income statement. Prior to January 1, 2018, the equity securities were classified as available-for-sale and stated at fair value with unrealized gains and losses included in accumulated comprehensive income, net of tax and had a net unrealized loss of $189,000. Other equity securities without readily determinable fair values are recorded at cost less any impairment, if any, and included in other investments in our consolidated financial statements. In February 2016, the FASB issued Accounting Standards Update No. 2016-02 to ASC 820, “Leases.” The update amends existing standards for accounting for leases by lessees, with accounting for leases by lessors remaining mainly unchanged from current guidance. The update requires that lessees recognize a lease liability and a right of use asset for all leases (with the exception of short-term leases) at the commencement date of the lease and disclose key information about leasing arrangements. The update is to be applied on a modified retrospective basis for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the consolidated financial statements. The update is effective for interim and annual periods beginning after December 15, 2018. In January 2018, the FASB issued a proposal that provides an additional transition method that would allow entities to not apply the guidance in the update in the comparative periods presented in the consolidated financial statements, but instead recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. The adoption of the update is not expected to have a significant impact to our consolidated financial statements. 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 amends the accounting for credit losses on available-for-sale debt securities and purchased financial assets with credit deterioration and effective for interim and annual periods beginning after December 15, 2019. The change in accounting method represents a significant difference to current accounting practice over the accounting for credit losses on financial assets. We have formed a task force including key members of the teams that work with the current calculation of the allowance for probable loan losses and members representing the corporate accounting and risk management areas. The task force will be working with a plan to develop and implement the changes to current practice with support from third-party vendors. We cannot estimate at this time the impact of ASC 326. In January 2017, the FASB issued Accounting Standards Update No. 2017-04 to ASC 350, “Intangibles – Goodwill and Other.” The update amends existing guidance in evaluating goodwill for impairment. The update requires that an entity perform its annual or interim goodwill test by comparing the fair value of a reporting unit with its carrying amount, with any impairment charges being recognized as the difference between the fair value and carrying value. The update is intended to standardize the impairment test for all business entities and also reduce the complexity and cost of evaluating goodwill for impairment. The update is effective for any annual or interim goodwill impairment tests in fiscal years beginning after December 15, 2019. The adoption of the update is not expected to have a significant impact to our consolidated financial statements. In March 2017, the FASB issued Accounting Standards Update No. 2017-08 to ASC 310, “Receivables – Nonrefundable Fees and Other Costs.” The update amends existing guidance on the amortization period for certain callable debt securities held at a premium. The update shortens the amortization period of the premium to the earliest call date. The update is effective for fiscal years beginning after December 15, 2018. The update is to be applied on a modified retrospective basis through a cumulative-effect adjustment to retained earnings as of the beginning of the period of adoption. The adoption of the update did not have a significant impact to our consolidated financial statements. In February 2018, the FASB issued Accounting Standards Update No. 2018-02 to ASC 220, “Income Statement – Reporting Comprehensive Income.” The update amends current guidance surrounding the reclassification of certain tax effects from accumulated other comprehensive income. The update is being issued as a result of the 2017 Tax Cuts and Jobs Act and the related impact to comprehensive income as a result of the application of current guidance with respect to changes in tax rates. Under current guidance, entities must re-evaluate the carrying value of deferred tax assets and liabilities and adjust them for the tax effect of the rate change and record that change through earnings. The result is that the tax effects for items that normally would only be recognized in comprehensive income will be recognized through earnings and results in stranded tax effects in accumulated other comprehensive income (loss) for the impact of the rate change. The update will allow a reclassification from accumulated other comprehensive income (loss) to retained earnings for the stranded tax effects resulting from the 2017 Tax Cuts and Jobs Act. The update is effective for all entities for fiscal years beginning after December 31, 2018. We adopted the provisions of ASU 2018-02 to ASC 220 in the second quarter of 2018. We recorded a one-time reclassification of $5,997,000 between accumulated comprehensive income (loss) and retained earnings as a result of the adoption of the accounting standards update. In August 2018, the FASB issued Accounting Standards Update No. 2018-13 to ASC 820, “Fair Value Measurement.” The update amends the existing guidance surrounding the disclosure of certain fair value measurements. The update removes certain disclosures that are no longer considered cost beneficial, modifies and, in some instances clarifies, the specific requirements of certain disclosures and adds disclosure requirements that are identified relevant. The update is effective for fiscal years beginning after December 15, 2019. The adoption of the update is not expected to have a significant impact on our consolidated financial statements.

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2018
Investment Securities
Amortized cost and estimated fair value by type of investment security	The amortized cost and estimated fair value by type of investment security at December 31, 2018 are as follows: Held to Maturity Gross Gross Amortized unrealized unrealized Estimated Carrying cost gains losses fair value value (Dollars in Thousands) Other securities $ 1,200 $ — $ — $ 1,200 $ 1,200 Total investment securities $ 1,200 $ — $ — $ 1,200 $ 1,200 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 $ 3,295,366 $ 6,813 $ (79,169) $ 3,223,010 $ 3,223,010 Obligations of states and political subdivisions 185,799 2,646 (105) 188,340 188,340 Total investment securities $ 3,481,165 $ 9,459 $ (79,274) $ 3,411,350 $ 3,411,350 (1) Included in the carrying value of residential mortgage‑ backed securities are $501,293 of mortgage‑backed securities issued by Ginnie Mae and $2,721,717 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, 2017 are as follows: Held to Maturity Gross Gross Amortized unrealized unrealized Estimated Carrying cost gains losses fair value value (Dollars in Thousands) Other securities $ 2,400 $ — $ — $ 2,400 $ 2,400 Total investment securities $ 2,400 $ — $ — $ 2,400 $ 2,400 Available for Sale Gross Gross Estimated Amortized unrealized unrealized fair Carrying cost gains losses value value (1) (Dollars in Thousands) Residential mortgage-backed securities $ 3,943,092 $ 14,110 $ (65,969) $ 3,891,233 $ 3,891,233 Obligations of states and political subdivisions 225,096 7,871 (16) 232,951 232,951 Equity securities 28,075 293 (482) 27,886 27,886 Total investment securities $ 4,196,263 $ 22,274 $ (66,467) $ 4,152,070 $ 4,152,070 (1) Included in the carrying value of residential mortgage‑ backed securities are $654,063 of mortgage‑backed securities issued by Ginnie Mae and $3,237,170 of mortgage‑backed securities issued by Fannie Mae and Freddie Mac
Amortized cost and fair value of investment securities, by contractual maturity	Held to Maturity Available for Sale Amortized Estimated Amortized Estimated Cost fair value Cost fair value (Dollars in Thousands) Due in one year or less $ — $ — $ — $ — Due after one year through five years 1,200 1,200 — — Due after five years through ten years — — 500 502 Due after ten years — — 185,299 187,838 Residential mortgage-backed securities — — 3,295,366 3,223,010 Total investment securities $ 1,200 $ 1,200 $ 3,481,165 $ 3,411,350
Gross unrealized losses on investment securities and the related fair value	Gross unrealized losses on investment securities and the fair value of the related securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2018 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 $ 208,384 $ (2,124) $ 2,537,181 $ (77,045) $ 2,745,565 $ (79,169) Obligations of states and political subdivisions 12,756 (99) 512 (6) 13,268 (105) $ 221,140 $ (2,223) $ 2,537,693 $ (77,051) $ 2,758,833 $ (79,274) Gross unrealized losses on investment securities and the fair value of the related securities, aggregated by investment category and length of time that individual securities have been in a continuous loss position, at December 31, 2017 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 $ 1,061,577 $ (13,157) $ 2,029,455 $ (52,812) $ 3,091,032 $ (65,969) Obligations of states and political subdivisions 5,534 (9) 522 (7) 6,056 (16) Equity securities 11,499 (251) 8,019 (231) 19,518 (482) $ 1,078,610 $ (13,417) $ 2,037,996 $ (53,050) $ 3,116,606 $ (66,467)
Reconciliation of credit-related impairment charges on available-for-sale investment	The following table presents a reconciliation of credit‑related impairment charges on available‑for‑sale investments recognized in earnings for the twelve months ended December 31, 2017 (in Thousands): Balance at December 31, 2016 $ Sale of other-than-temporarily impaired available-for-sale securities during period (13,931) Balance at December 31, 2017 $ — The following table presents a reconciliation of credit‑related impairment charges on available‑for‑sale investments recognized in earnings for the twelve months ended December 31, 2016 (in Thousands): Balance at December 31, 2015 $ Impairment charges recognized during period Balance at December 31, 2016 $
Summary of unrealized and realized gains and losses recognized in net income on equity securities	Year Ended December 31, (Dollars in Thousands) 2018 Net losses recognized during the period on equity securities $ (388) 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 $ (388)

Loans (Tables)

Loans (Tables)	12 Months Ended
	Dec. 31, 2018
Loans
Summary of loans, by loan type	December 31, December 31, 2018 2017 (Dollars in Thousands) Commercial, financial and agricultural $ 3,305,124 $ 3,322,668 Real estate - mortgage 1,173,101 1,133,525 Real estate - construction 1,886,231 1,683,550 Consumer 46,316 49,543 Foreign 150,517 158,886 Total loans $ 6,561,289 $ 6,348,172

Allowance for Probable Loan L_2

Allowance for Probable Loan Losses (Tables)	12 Months Ended
	Dec. 31, 2018
Allowance for Probable Loan Losses
Summary of the transactions in the allowance for probable loan losses by loan class	December 31, 2018 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, $ 27,905 $ 11,675 $ 16,663 $ 1,109 $ 2,950 $ 6,103 $ 440 $ 842 $ 67,687 Losses charge to allowance (14,220) (1) (70) — (122) (347) (362) (3) (15,125) Recoveries credited to allowance 1,981 25 246 — 36 369 43 10 2,710 Net losses charged to allowance (12,239) 24 176 — (86) 22 (319) 7 (12,415) Provision (credit) charged to operations (3,070) 3,424 2,514 699 603 1,594 326 22 6,112 Balance at December 31, $ 12,596 $ 15,123 $ 19,353 $ 1,808 $ 3,467 $ 7,719 $ 447 $ 871 $ 61,384 December 31, 2017 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, $ 25,649 $ 13,889 $ 16,731 $ 806 $ 2,455 $ 3,716 $ 531 $ 884 $ 64,661 Losses charge to allowance (12,094) (213) (40) — (101) (340) (309) (1) (13,098) Recoveries credited to allowance 4,020 21 527 — 11 258 45 21 4,903 Net losses charged to allowance (8,074) (192) 487 — (90) (82) (264) 20 (8,195) Provision (credit) charged to operations 10,330 (2,022) (555) 303 585 2,469 173 (62) 11,221 Balance at December 31, $ 27,905 $ 11,675 $ 16,663 $ 1,109 $ 2,950 $ 6,103 $ 440 $ 842 $ 67,687 December 31, 2016 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, $ 21,431 $ 13,920 $ 19,769 $ 1,248 $ 3,509 $ 5,321 $ 638 $ 1,152 $ 66,988 Losses charge to allowance (32,959) (16) (1,890) (180) (70) (331) (414) (41) (35,901) Recoveries credited to allowance 7,110 6,099 119 — 21 278 69 19 13,715 Net losses charged to allowance (25,849) 6,083 (1,771) (180) (49) (53) (345) (22) (22,186) Provision (credit) charged to operations 30,067 (6,114) (1,267) (262) (1,005) (1,552) 238 (246) 19,859 Balance at December 31, $ 25,649 $ 13,889 $ 16,731 $ 806 $ 2,455 $ 3,716 $ 531 $ 884 $ 64,661
Loans individually or collectively evaluated for their impairment and related allowance, by loan class	December 31, 2018 Loans Individually Loans Collectively Evaluated For Evaluated For Impairment Impairment Recorded Recorded Investment Allowance Investment Allowance (Dollars in Thousands) Domestic Commercial $ 9,179 $ 656 $ 1,119,790 $ 11,940 Commercial real estate: other construction & land development 2,092 116 1,884,139 15,007 Commercial real estate: farmland & commercial 3,509 — 1,946,389 19,353 Commercial real estate: multifamily 507 — 225,750 1,808 Residential: first lien 6,244 — 439,556 3,467 Residential: junior lien 901 — 726,400 7,719 Consumer 1,175 — 45,141 447 Foreign 293 — 150,224 871 Total $ 23,900 $ 772 $ 6,537,389 $ 60,612 December 31, 2017 Loans Individually Loans Collectively Evaluated For Evaluated For Impairment Impairment Recorded Recorded Investment Allowance Investment Allowance (Dollars in Thousands) Domestic Commercial $ 17,947 $ 300 $ 1,068,520 $ 27,605 Commercial real estate: other construction & land development 2,455 116 1,681,095 11,559 Commercial real estate: farmland & commercial 33,123 18 2,010,162 16,645 Commercial real estate: multifamily 476 — 192,440 1,109 Residential: first lien 6,852 — 425,925 2,950 Residential: junior lien 723 — 700,025 6,103 Consumer 1,281 — 48,262 440 Foreign 347 — 158,539 842 Total $ 63,204 $ 434 $ 6,284,968 $ 67,253
Loans accounted on non-accrual basis, by loan class	December 31, 2018 December 31, 2017 (Dollars in Thousands) Domestic Commercial $ 9,143 $ 17,909 Commercial real estate: other construction & land development 2,092 2,455 Commercial real estate: farmland & commercial 3,509 33,123 Commercial real estate: multifamily 507 476 Residential: first lien 347 712 Residential: junior lien 171 11 Consumer 22 44 Total non-accrual loans $ 15,791 $ 54,730
Impaired loans, by loan class	The following tables detail key information regarding our impaired loans by loan class for the year ended December 31, 2018: December 31, 2018 Unpaid Average Recorded Principal Related Recorded Interest Investment Balance Allowance Investment Recognized (Dollars in Thousands) Loans with Related Allowance Domestic Commercial $ 1,563 $ 2,161 $ 656 $ 1,741 $ — Commercial real estate: other construction & land development 135 169 116 141 — Total impaired loans with related allowance $ 1,698 $ 2,330 $ 772 $ 1,882 $ — December 31, 2018 Unpaid Average Recorded Principal Recorded Interest Investment Balance Investment Recognized (Dollars in Thousands) Loans with No Related Allowance Domestic Commercial $ 7,616 $ 7,730 $ 16,194 $ 3 Commercial real estate: other construction & land development 1,957 2,205 2,151 — Commercial real estate: farmland & commercial 3,509 4,031 36,632 — Commercial real estate: multifamily 507 538 565 — Residential: first lien 6,244 6,386 7,136 305 Residential: junior lien 901 911 976 44 Consumer 1,175 1,190 1,211 2 Foreign 293 293 327 14 Total impaired loans with no related allowance $ 22,202 $ 23,284 $ 65,192 $ 368 The following tables detail key information regarding our impaired loans by loan class for the year ended December 31, 2017: December 31, 2017 Unpaid Average Recorded Principal Related Recorded Interest Investment Balance Allowance Investment Recognized (Dollars in Thousands) Loans with Related Allowance Domestic Commercial real estate: other construction & land development $ 1,300 $ 1,577 $ 300 1,346 — Commercial real estate: farmland & commercial 145 169 116 150 — Commercial real estate: multifamily 449 590 18 489 — Total impaired loans with related allowance $ 1,894 $ 2,336 $ 434 $ 1,985 $ — December 31, 2017 Unpaid Average Recorded Principal Recorded Interest Investment Balance Investment Recognized (Dollars in Thousands) Loans with No Related Allowance Domestic Commercial $ 16,646 $ 44,095 $ 19,615 $ 3 Commercial real estate: other construction & land development 2,310 2,455 3,493 — Commercial real estate: farmland & commercial 32,675 33,275 38,536 — Commercial real estate: multifamily 476 505 511 — Residential: first lien 6,852 6,968 7,249 324 Residential: junior lien 723 736 970 45 Consumer 1,281 1,283 1,293 3 Foreign 347 347 750 16 Total impaired loans with no related allowance $ 61,310 $ 89,664 $ 72,417 $ 391
Loans accounted for as trouble debt restructuring, by loan class	December 31, 2018 December 31, 2017 (Dollars in Thousands) Domestic Commercial $ 35 $ 6,910 Commercial real estate: farmland & commercial — — Residential: first lien 5,947 6,140 Residential: junior lien 730 712 Consumer 1,153 1,237 Foreign 293 347 Total troubled debt restructuring $ 8,158 $ 15,346
Information regarding the aging of past due loans, by loan class	December 31, 2018 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 $ 4,651 $ 1,089 $ 19,851 $ 10,890 $ 25,591 $ 1,103,378 $ 1,128,969 Commercial real estate: other construction & land development 727 1,707 922 16 3,356 1,882,875 1,886,231 Commercial real estate: farmland & commercial 2,928 784 27,239 24,910 30,951 1,918,947 1,949,898 Commercial real estate: multifamily 927 — 578 71 1,505 224,752 226,257 Residential: first lien 3,998 1,677 3,362 3,079 9,037 436,763 445,800 Residential: junior lien 1,155 618 1,108 937 2,881 724,420 727,301 Consumer 486 19 45 32 550 45,766 46,316 Foreign 1,106 117 739 739 1,962 148,555 150,517 Total past due loans $ 15,978 $ 6,011 $ 53,844 $ 40,674 $ 75,833 $ 6,485,456 $ 6,561,289 December 31, 2017 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 $ 3,790 $ 398 $ 18,308 $ 537 $ 22,496 $ 1,063,971 $ 1,086,467 Commercial real estate: other construction & land development 354 308 820 6 1,482 1,682,068 1,683,550 Commercial real estate: farmland & commercial 3,925 518 31,133 954 35,576 2,007,709 2,043,285 Commercial real estate: multifamily 84 — 476 — 560 192,356 192,916 Residential: first lien 4,295 2,458 4,095 3,861 10,848 421,929 432,777 Residential: junior lien 1,310 580 1,110 1,099 3,000 697,748 700,748 Consumer 868 98 160 133 1,126 48,417 49,543 Foreign 1,229 69 667 667 1,965 156,921 158,886 Total past due loans $ 15,855 $ 4,429 $ 56,769 $ 7,257 $ 77,053 $ 6,271,119 $ 6,348,172
Summary of the loan portfolio by credit quality indicator, by loan class	December 31, 2018 Special Watch Watch List— Watch List— Pass Review List—Pass Substandard Impaired (Dollars in Thousands) Domestic Commercial $ 998,625 $ 441 $ 44,544 $ 76,180 $ 9,179 Commercial real estate: other construction & land development 1,817,098 1,648 9,055 56,338 2,092 Commercial real estate: farmland & commercial 1,726,711 62,046 38,373 119,259 3,509 Commercial real estate: multifamily 224,823 — — 927 507 Residential: first lien 438,773 — 142 641 6,244 Residential: junior lien 725,538 — 862 — 901 Consumer 45,141 — — — 1,175 Foreign 150,224 — — — 293 Total $ 6,126,933 $ 64,135 $ 92,976 $ 253,345 $ 23,900 December 31, 2017 Special Watch Watch List— Watch List— Pass Review List—Pass Substandard Impaired (Dollars in Thousands) Domestic Commercial $ 905,707 $ — $ 3,170 $ 159,643 $ 17,947 Commercial real estate: other construction & land development 1,616,604 1,288 672 62,531 2,455 Commercial real estate: farmland & commercial 1,863,763 5,134 41,820 99,445 33,123 Commercial real estate: multifamily 192,440 — — — 476 Residential: first lien 425,811 40 — 74 6,852 Residential: junior lien 699,875 150 — — 723 Consumer 48,262 — — — 1,281 Foreign 158,539 — — — 347 Total $ 5,911,001 $ 6,612 $ 45,662 $ 321,693 $ 63,204

Bank Premises and Equipment (Ta

Bank Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2018
Bank Premises and Equipment
Summary of bank premises and equipment, by asset classification	Estimated useful lives 2018 2017 (Dollars in Thousands) Bank buildings and improvements 5 - 40 years $ 563,302 $ 550,094 Furniture, equipment and vehicles 1 - 20 years 292,958 289,743 Land 118,806 123,087 Real estate held for future expansion: Land, building, furniture, fixture and equipment 7 - 27 years — — Less: accumulated depreciation (468,167) (448,470) Bank premises and equipment, net $ 506,899 $ 514,454

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2018
Goodwill and Other Intangible Assets
Schedule of the entity's identified intangible assets	Carrying Accumulated Amount Amortization Net (Dollars in Thousands) December 31, 2018: Core deposit premium $ 58,675 $ 58,675 $ — Identified intangible (contract rights) 2,022 2,022 — Total identified intangibles $ 60,697 $ 60,697 $ — December 31, 2017: Core deposit premium $ 58,675 $ 58,675 $ — Identified intangible (contract rights) 2,022 2,022 — Total identified intangibles $ 60,697 $ 60,697 $ —

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2018
Deposits.
Schedule of deposits and related interest expense	2018 2017 (Dollars in Thousands) Deposits: Demand - non-interest bearing Domestic $ 2,758,768 $ 2,609,932 Foreign 696,072 633,323 Total demand non-interest bearing 3,454,840 3,243,255 Savings and interest bearing demand Domestic 2,531,854 2,615,143 Foreign 736,383 629,988 Total savings and interest bearing demand 3,268,237 3,245,131 Time, certificates of deposit $100,000 or more Domestic 590,895 637,006 Foreign 807,486 808,881 Less than $100,000 Domestic 323,377 354,998 Foreign 251,710 255,621 Total time, certificates of deposit 1,973,468 2,056,506 Total deposits $ 8,696,545 $ 8,544,892 2018 2017 2016 (Dollars in Thousands) Interest expense: Savings and interest bearing demand Domestic $ 11,029 $ 5,453 $ 3,922 Foreign 1,735 755 640 Total savings and interest bearing demand 12,764 6,208 4,562 Time, certificates of deposit $100,000 or more Domestic 4,741 3,644 3,881 Foreign 5,798 4,105 3,929 Less than $100,000 Domestic 1,589 1,312 1,447 Foreign 968 675 706 Total time, certificates of deposit 13,096 9,736 9,963 Total interest expense on deposits $ 25,860 $ 15,944 $ 14,525
Scheduled maturities of time deposits	Scheduled maturities of time deposits as of December 31, 2018 were as follows: Total (in thousands) 2019 $ 1,786,776 2020 138,105 2021 31,665 2022 15,717 2023 1,096 Thereafter 109 Total $ 1,973,468
Scheduled maturities of time deposits in amounts of $100,000 or more	Total (in thousands) Due within 3 months or less $ 500,836 Due after 3 months and within 6 months 337,349 Due after 6 months and within 12 months 433,628 Due after 12 months 126,568 $ 1,398,381

Securities Sold Under Repurch_2

Securities Sold Under Repurchase Agreements (Tables)	12 Months Ended
	Dec. 31, 2018
Securities Sold Under Repurchase Agreements
Schedule of repurchase agreements	Collateral Securities Repurchase Borrowing Book Value of Fair Value of Balance of Weighted Average Securities Sold Securities Sold Liability Interest Rate (Dollars in Thousands) December 31, 2018 term: Overnight agreements $ 357,642 $ 349,081 $ 218,852 0.85 % 1 to 29 days — — — — 30 to 90 days — — — — Over 90 days 11,444 11,096 11,137 1.27 Total $ 369,086 $ 360,177 $ 229,989 0.87 % December 31, 2017 term: Overnight agreements $ 340,054 $ 334,506 $ 242,824 0.25 % 1 to 29 days — — — — 30 to 90 days 109,300 107,238 100,000 3.99 Over 90 days 11,327 11,168 10,981 0.74 Total $ 460,681 $ 452,912 $ 353,805 1.32 %

Other Borrowed Funds (Tables)

Other Borrowed Funds (Tables)	12 Months Ended
	Dec. 31, 2018
Other Borrowed Funds
Schedule of other borrowed funds	December 31, 2018 2017 (Dollars in Thousands) Federal Home Loan Bank advances—short-term Balance at year end $ 268,975 $ 945,225 Rate on balance outstanding at year end 2.70 % 1.44 % Average daily balance $ 621,357 $ 839,858 Average rate 1.97 % 1.23 % Maximum amount outstanding at any month end $ 1,007,100 $ 1,043,250 Federal Home Loan Bank advances—long-term (1) Balance at year end $ 436,690 $ 250,000 Rate on balance outstanding at year end 1.73 % 1.26 % Average daily balance $ 302,373 $ 51,644 Average rate 1.71 % 1.26 % Maximum amount outstanding at any month end $ 436,700 $ 250,000 Long-term advances at December 31, 2018 consisted of both amortizing and non-amortizing advances. The non-amortizing advances mature in the following increments: $75,000,000 in July 2028, $100,000,000 in March 2033 and $250,000,000 in August 2033 and are callable by the FHLB on an annual basis. Two amortizing advances are outstanding at December 31, 2018 in the amounts of $3,200,000 and $8,490,000 and mature in December 2033 and November 2033, respectively. The amortization on the amortizing long-term advances totals approximately $179,000 per year for each of the next five years. Long-term advances outstanding at December 31, 2017 mature in the following increments: $100,000,000 in November 2027 and $150,000,000 in December 2027 and are callable by the FHLB on a quarterly basis.

Junior Subordinated Interest _2

Junior Subordinated Interest Deferrable Debentures (Tables)	12 Months Ended
	Dec. 31, 2018
Junior Subordinated Interest Deferrable Debentures
Junior subordinated deferrable interest debentures, major types of business trusts	The following table illustrates key information about each of the Debentures and their interest rates at December 31, 2018: Junior Subordinated Deferrable Interest Repricing Interest Interest Optional Debentures Frequency Rate Rate Index(1) Maturity Date Redemption Date (1) (Dollars in Thousands) Trust VI $ 25,774 Quarterly 6.07 % LIBOR + November 2032 February 2008 Trust VIII 25,774 Quarterly 5.49 % LIBOR + October 2033 October 2008 Trust IX 41,238 Quarterly 4.02 % LIBOR + October 2036 October 2011 Trust X 21,021 Quarterly 4.19 % LIBOR + February 2037 February 2012 Trust XI 25,990 Quarterly 4.02 % LIBOR + July 2037 July 2012 Trust XII 20,619 Quarterly 4.19 % LIBOR + September 2037 September 2012 $ 160,416 (1) The Capital Securities may be redeemed in whole or in part on any interest payment date after the Optional Redemption Date.

Earnings per Share ("EPS") (Tab

Earnings per Share ("EPS") (Tables)	12 Months Ended
	Dec. 31, 2018
Earnings per Share ("EPS")
Schedule of calculation of the basic EPS and the diluted EPS	Net Income Shares Per Share (Numerator) (Denominator) Amount (Dollars in Thousands, Except Per Share Amounts) December 31, 2018: Basic EPS Net income available to common shareholders $ 215,931 66,106,580 $ 3.27 Potential dilutive common shares and warrants — 527,240 Diluted EPS $ 215,931 66,633,820 $ 3.24 December 31, 2017: Basic EPS Net income available to common shareholders $ 157,436 66,046,155 $ 2.38 Potential dilutive common shares and warrants — 732,281 Diluted EPS $ 157,436 66,778,436 $ 2.36 December 31, 2016: Basic EPS Net income available to common shareholders $ 133,932 65,967,989 $ 2.03 Potential dilutive common shares — 345,501 Diluted EPS $ 133,932 66,313,490 $ 2.02

International Operations (Table

International Operations (Tables)	12 Months Ended
	Dec. 31, 2018
International Operations
Summary of assets attributable to international operations	2018 2017 (Dollars in Thousands) Loans: Commercial $ 101,955 $ 113,019 Others 48,562 45,867 150,517 158,886 Less allowance for probable loan losses (842) Net loans $ 149,646 $ 158,044 Accrued interest receivable $ 811 $ 671

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2018
Income Taxes
Schedule of current and deferred portions of net income tax expense	2018 2017 2016 (Dollars in Thousands) Current U.S. $ 48,144 $ 56,974 $ 52,403 State 3,370 2,662 3,362 Foreign (5) — — Total current taxes 51,509 59,636 55,765 Deferred U.S. 5,130 4,620 7,279 State 13 (50) 27 Total deferred taxes 5,143 4,570 7,306 Total income taxes $ 56,652 $ 64,206 $ 63,071
Schedule of income tax expense differences from the amount computed by applying the U.S. Federal income tax rate to income before income taxes	2018 2017 2016 (Dollars in Thousands) Computed expected tax expense $ 57,831 $ 77,643 $ 69,253 Change in taxes resulting from: Tax-exempt interest income (3,101) (4,701) (3,940) State tax, net of federal income taxes, tax credit and refunds 2,673 1,697 3,287 Resolution of IRS exam — (4,985) — Other investment income (1,561) (3,198) (3,694) Deferred tax adjustment due to federal tax rate change (1,618) (3,168) — Net investment expense, low income housing investments 2,518 387 — Other (90) 531 (1,835) Actual tax expense $ 56,652 $ 64,206 $ 63,071
Schedule of tax effects of temporary difference that give rise to significant portions of the deferred tax assets and deferred tax liabilities	2018 2017 (Dollars in Thousands) Deferred tax assets: Loans receivable, principally due to the allowance for probable loan losses $ 12,257 $ 14,546 Other real estate owned 2,459 2,053 Impairment charges on available-for-sale securities 1,054 844 Accrued expenses 81 81 Net unrealized losses on available for sale investment securities 15,182 9,680 Other 5,076 4,434 Total deferred tax assets 36,109 31,638 Deferred tax liabilities: Bank premises and equipment, principally due to differences on depreciation (12,596) (10,940) Identified intangible assets and goodwill (13,490) (13,417) Other (14,787) (12,474) Total deferred tax liabilities (40,873) (36,831) Net deferred tax liability $ (4,764) $ (5,193)

Stock Options (Tables)

Stock Options (Tables)	12 Months Ended
	Dec. 31, 2018
Stock Options
Schedule of Black-Scholes-Merton option valuation model assumptions	2018 2017 Expected Life (Years) 7.00 — Dividend yield 1.73 % — % Interest rate 2.68 % — % Volatility 31.65 % — % (1) No stock options were granted during the twelve months ended December 31, 2017.
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, 2017 668,166 $ Plus: Options granted 234,700 Less: Options exercised 84,701 Options expired — — Options forfeited 29,188 Options outstanding at December 31, 2018 788,977 $ 7,587 Options fully vested and exercisable at December 31, 2018 310,108 $ $ 4,486
Schedule of other information pertaining to option activity	Twelve Months Ended December 31, 2018 2017 2016 Weighted average grant date fair value of stock options granted $ 11.78 $ — $ 8.74 Total fair value of stock options vested $ 1,077,000 $ 1,182,000 $ 1,015,000 Total intrinsic value of stock options exercised $ 2,045,000 $ 2,595,000 $ 792,000 (1) No stock options were granted during the twelve months ended December 31, 2017.

Commitments, Contingent Liabi_2

Commitments, Contingent Liabilities and Other Matters (Tables)	12 Months Ended
	Dec. 31, 2018
Commitments, Contingent Liabilities and Other Tax Matters
Schedule of future minimum lease payments due under non-cancellable operating leases	Total (in thousands) 2019 $ 3,443 2020 3,246 2021 2,272 2022 579 2023 212 Thereafter 275 Total $ 10,027

Financial Instruments with Of_2

Financial Instruments with Off-Statement of Condition Risk and Concentrations of Credit Risk (Tables)	12 Months Ended
	Dec. 31, 2018
Financial Instruments with Off-Statement of Condition Risk and Concentrations of Credit Risk
Schedule of financial amounts of instruments, whose contract amounts represent credit risks	Commitments to extend credit $ 2,935,768,000 Credit card lines 21,114,000 Standby letters of credit 111,229,000 Commercial letters of credit 8,073,000

Capital Requirements (Tables)

Capital Requirements (Tables)	12 Months Ended
	Dec. 31, 2018
Capital Requirements
Schedule of the Company's and the bank subsidiaries' actual capital amounts and ratios	Our actual capital amounts and ratios for 2018 under current guidelines are presented in the following table: For Capital Adequacy To Be Well-Capitalized Purposes Under Prompt Corrective Actual Phase In Schedule Action Provisions Amount Ratio Amount Ratio Amount Ratio (greater than (greater than (greater than (greater than or equal to) or equal to) or equal to) or equal to) (Dollars in Thousands) As of December 31, 2018: Common Equity Tier 1 (to Risk Weighted Assets): Consolidated $ 1,711,682 17.55 % $ 621,850 6.375 % N/A N/A International Bank of Commerce, Laredo 1,201,462 17.24 444,207 6.375 $ 452,917 % International Bank of Commerce, Oklahoma 188,997 13.95 86,344 6.375 88,037 International Bank of Commerce, Brownsville 177,456 24.73 45,741 6.375 46,638 International Bank of Commerce, Zapata 70,984 30.77 14,707 6.375 14,996 Commerce Bank 89,305 32.95 17,276 6.375 17,615 Total Capital (to Risk Weighted Assets): Consolidated $ 1,925,905 19.74 % $ 963,258 9.875 % N/A N/A International Bank of Commerce, Laredo 1,248,107 17.91 688,086 9.875 $ 696,796 % International Bank of Commerce, Oklahoma 198,293 14.64 133,749 9.875 135,442 International Bank of Commerce, Brownsville 183,554 25.58 70,854 9.875 71,750 International Bank of Commerce, Zapata 73,726 31.96 22,782 9.875 23,070 Commerce Bank 90,894 33.54 26,761 9.875 27,100 Tier 1 Capital (to Risk Weighted Assets): Consolidated $ 1,859,536 19.06 % $ 768,168 7.875 % N/A N/A International Bank of Commerce, Laredo 1,201,462 17.24 548,727 7.875 $ 557,437 % International Bank of Commerce, Oklahoma 188,997 13.95 106,660 7.875 108,354 International Bank of Commerce, Brownsville 177,456 24.73 56,503 7.875 57,400 International Bank of Commerce, Zapata 70,984 30.77 18,168 7.875 18,456 Commerce Bank 89,305 32.95 21,341 7.875 21,680 Tier 1 Capital (to Average Assets): Consolidated $ 1,859,536 15.87 % $ 468,593 % $ N/A N/A International Bank of Commerce, Laredo 1,201,462 14.45 332,507 415,634 % International Bank of Commerce, Oklahoma 188,997 12.53 60,344 75,430 International Bank of Commerce, Brownsville 177,456 17.25 41,144 51,430 International Bank of Commerce, Zapata 70,984 16.22 17,507 21,884 Commerce Bank 89,305 15.53 23,000 28,750 Our actual capital amounts and ratios for 2017 are also presented in the following table: To Be Well-Capitalized For Capital Adequacy Under Prompt Corrective Actual Purposes Action Provisions Amount Ratio Amount Ratio Amount Ratio (greater than (greater than (greater than (greater than or equal to) or equal to) or equal to) or equal to) (Dollars in Thousands) As of December 31, 2017: Common Equity Tier 1 (to Risk Weighted Assets): Consolidated $ 1,584,665 % $ 532,579 % N/A N/A International Bank of Commerce, Laredo 1,119,173 376,245 $ 425,320 % International Bank of Commerce, Oklahoma 169,279 72,586 82,054 International Bank of Commerce, Brownsville 165,034 36,583 41,355 International Bank of Commerce, Zapata 66,406 12,487 14,116 Commerce Bank 79,330 13,733 15,524 Total Capital (to Risk Weighted Assets): Consolidated $ 1,807,107 % $ 856,757 % N/A N/A % International Bank of Commerce, Laredo 1,173,068 605,263 $ 654,339 International Bank of Commerce, Oklahoma 178,057 116,769 126,237 International Bank of Commerce, Brownsville 170,613 58,851 63,623 International Bank of Commerce, Zapata 68,718 20,088 21,717 Commerce Bank 81,278 22,092 23,884 Tier 1 Capital (to Risk Weighted Assets): % Consolidated $ 1,734,595 % $ 671,512 % N/A N/A International Bank of Commerce, Laredo 1,119,173 474,395 $ 523,471 International Bank of Commerce, Oklahoma 169,279 91,521 100,989 International Bank of Commerce, Brownsville 165,034 46,127 50,899 International Bank of Commerce, Zapata 66,406 15,745 17,374 Commerce Bank 79,330 17,316 19,107 % Tier 1 Capital (to Average Assets): Consolidated $ 1,734,595 % $ 474,675 % $ N/A N/A International Bank of Commerce, Laredo 1,119,173 333,166 416,458 International Bank of Commerce, Oklahoma 169,279 59,854 74,818 International Bank of Commerce, Brownsville 165,034 38,440 48,050 International Bank of Commerce, Zapata 66,406 18,701 23,376 Commerce Bank 79,330 21,789 27,236

Fair Value (Tables)

Fair Value (Tables)	12 Months Ended
	Dec. 31, 2018
Fair Value
Assets and liabilities measured at fair value on a recurring basis	The following table represents financial instruments reported on the consolidated statements of condition at their fair value as of December 31, 2018 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, 2018 (Level 1) (Level 2) (Level 3) Measured on a recurring basis: Assets: Available for sale debt securities Residential mortgage-backed securities $ 3,223,010 $ — $ 3,223,010 $ — States and political subdivisions 188,340 — 188,340 — Equity securities with readily determinable fair values 5,937 5,937 — — $ 3,417,287 $ 5,937 $ 3,411,350 $ — The following table represents financial instruments reported on the consolidated balance sheets at their fair value as of December 31, 2017 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, 2017 (Level 1) (Level 2) (Level 3) Measured on a recurring basis: Assets: Available for sale securities Residential mortgage - backed securities $ 3,891,233 $ — $ 3,891,233 $ — States and political subdivisions 232,951 — 232,951 — Equity securities with readily determinable fair values 27,886 27,886 — — $ 4,152,070 $ 27,886 $ 4,124,184 $ —
Assets measured at fair value on a non-recurring basis	The following table represents financial instruments measured at fair value on a non‑recurring basis as of and for the period ended December 31, 2018 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 Year ended Identical Observable Unobservable (Credit) December 31, Assets Inputs Inputs During 2018 (Level 1) (Level 2) (Level 3) Period Measured on a non-recurring basis: Assets: Impaired loans $ 1,563 $ — $ — $ 1,563 $ 356 Other real estate owned 38,871 — — 38,871 3,071 The following table represents financial instruments measured at fair value on a non‑recurring basis as of and for the year ended December 31, 2017 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 2017 (Level 1) (Level 2) (Level 3) Period Measured on a non-recurring basis: Assets: Impaired loans $ 11,210 $ — $ — $ 11,210 $ 2,138 Other real estate owned 2,000 — — 2,000 710

International Bancshares Corp_4

International Bancshares Corporation (Parent Company Only) Financial Information Statements of Condition (Tables)	12 Months Ended
	Dec. 31, 2018
International Bancshares Corporation (Parent Company Only) Financial Information Statements of Condition
Schedule of condensed statements of condition of Parent Company	(Dollars in Thousands) 2018 2017 ASSETS Cash $ 19,065 $ 18,398 Other investments 105,377 92,620 Investment in subsidiaries 1,987,293 1,878,521 Other assets — 23,120 Total assets $ 2,111,735 $ 2,012,659 LIABILITIES AND SHAREHOLDERS’ EQUITY Liabilities: Junior subordinated deferrable interest debentures $ 160,416 $ 160,416 Due to IBC Trading 21 21 Other liabilities 11,716 13,242 Total liabilities 172,153 173,679 Shareholders’ equity: Common shares 96,104 96,019 Surplus 145,283 171,816 Retained earnings 2,064,134 1,891,805 Accumulated other comprehensive (loss) income (54,634) (28,397) 2,250,887 2,131,243 Less cost of shares in treasury (311,305) (292,263) Total shareholders’ equity 1,939,582 1,838,980 Total liabilities and shareholders’ equity $ 2,111,735 $ 2,012,659

International Bancshares Corp_5

International Bancshares Corporation (Parent Company Only) Financial Information Statements of Income (Tables)	12 Months Ended
	Dec. 31, 2018
International Bancshares Corporation (Parent Company Only) Financial Information Statements of Income
Schedule of condensed statements of income of Parent Company	(Dollars in Thousands) 2018 2017 2016 Income: Dividends from subsidiaries $ 105,000 $ 64,600 $ 84,432 Interest income on notes receivable — — 2 Interest income on other investments 8,208 8,100 8,958 Other 1,988 26 255 Total income 115,196 72,726 93,647 Expenses: Interest expense (Debentures) 6,989 5,392 4,600 Other 2,930 5,648 3,637 Total expenses 9,919 11,040 8,237 Income before federal income taxes and equity in undistributed net income of subsidiaries 105,277 61,686 85,410 Income tax expense 481 (2,076) 311 Income before equity in undistributed net income of subsidiaries 104,796 63,762 85,099 Equity in undistributed net income of subsidiaries 111,135 93,674 48,833 Net income $ 215,931 $ 157,436 $ 133,932

International Bancshares Corp_6

International Bancshares Corporation (Parent Company Only) Financial Information Statements of Cash Flows (Tables)	12 Months Ended
	Dec. 31, 2018
International Bancshares Corporation (Parent Company Only) Financial Information Statements of Cash Flows
Schedule of condensed statements of cash flows of Parent Company	(Dollars in Thousands) 2018 2017 2016 Operating activities: Net income $ 215,931 $ 157,436 $ 133,932 Adjustments to reconcile net income to net cash provided by operating activities: Investment securities transactions, net — (23) — Unrealized loss on equity securities with readily determinable fair values 330 — — Impairment charges on available for sale securities — — 112 Stock compensation expense 1,035 903 1,082 (Decrease) increase in other liabilities (1,479) (3,453) 3,901 Equity in undistributed net income of subsidiaries (111,135) (93,674) (48,833) Net cash provided by operating activities 104,682 61,189 90,194 Investing activities: Principal collected on mortgage-backed securities — 6,328 1,105 Net decrease in notes receivable — — 99 Increase in other assets and other investments (7,891) (25,348) (27,834) Net cash used in investing activities (7,891) (19,020) (26,630) Financing activities: Redemption of long-term debt — — (1,000) Proceeds from stock transactions 1,522 1,455 549 Payments of cash dividends - common (49,599) (43,594) (39,569) Repurchase of outstanding common stock warrant (29,005) — — Purchase of treasury stock (19,042) (187) (7,966) Net cash used in financing activities (96,124) (42,326) (47,986) Increase (decrease) in cash 667 (157) 15,578 Cash at beginning of year 18,398 18,555 2,977 Cash at end of year $ 19,065 $ 18,398 $ 18,555

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Details)	Oct. 01, 2018USD ($)	Jun. 30, 2018USD ($)	Dec. 31, 2018USD ($)item	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Number of insurance-related subsidiaries | item			1
Investment Securities
Number of components in which other-than-temporary impairment is segregated | item			2
Non-Accrual Loans
Period of charge off for past due unsecured consumer loans			90 days
Minimum period that past due unsecured loans outstanding may not be placed on nonaccrual status under special circumstances			90 days
Maximum period of non-consumer loans outstanding that is used to evaluate whether loans should be placed on non-accrual status			90 days
Other Real Estate Owned and Reposessed Assets
Other real estate owned			$ 57,344,000	$ 30,519,000
Reposessed assets			$ 6,454,000	303,000
Income Taxes
Percentage of likelihood of realization of recognized tax benefit			50.00%
Liability for unrecognized tax benefits			$ 0	0
Interest expense related to uncertain tax positions			0	0	$ 0
Penalties related to uncertain tax positions			0	$ 0	$ 0
Goodwill and Identified Intangible Assets
Goodwill impairment loss	$ 0
Impairment of identified intangible assets			$ 0
Segments of an Enterprise and Related Information
Number of operating segments | item			1
Number of active operating bank subsidiaries | item			5
New Accounting Standards
One-time reclassification from AOCI to retained earnings, relating to the Tax Cuts and Jobs Act of 2017		$ 5,997,000
Equity securities with readily determinable fair values
New Accounting Standards
Net unrealized loss on available-for-sale equity securities			$ 189,000

Investment Securities (Details)

Investment Securities (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Held-to-maturity securities
Amortized cost	$ 1,200,000	$ 2,400,000
Estimated fair value	1,200,000	2,400,000
Carrying Value	1,200,000	2,400,000
Available-for-sale securities
Amortized cost, Available-for-sale securities	3,481,165,000	4,196,263,000
Gross Unrealized Gains	9,459,000
Gross Unrealized Losses	(79,274,000)
Available for sale debt securities	3,411,350,000	4,124,184,000
Equity Securities	5,937,000	27,886,000
Total Amortized cost	3,481,165,000	4,196,263,000
Total Gross unrealized gains		22,274,000
Total Gross unrealized losses		66,467,000
Available for sale debt securities and equity securities	3,411,350,000
Assets/liabilities measured at fair value
Available-for-sale securities
Total Amortized cost		4,152,070,000
Available for sale debt securities and equity securities	3,411,350,000
Carrying Value
Available-for-sale securities
Available for sale debt securities and equity securities	3,411,350,000	4,152,070,000
Residential mortgage-backed securities
Available-for-sale securities
Amortized cost, Available-for-sale securities	3,295,366,000	3,943,092,000
Gross Unrealized Gains	6,813,000	14,110,000
Gross Unrealized Losses	(79,169,000)	(65,969,000)
Residential mortgage-backed securities | Assets/liabilities measured at fair value
Available-for-sale securities
Available for sale debt securities	3,223,010,000	3,891,233,000
Residential mortgage-backed securities | Carrying Value
Available-for-sale securities
Available for sale debt securities	3,223,010,000	3,891,233,000
Mortgage-backed securities by Ginnie Mae
Available-for-sale securities
Available for sale debt securities	501,293,000	654,063,000
Mortgage-backed securities by Fannie Mae and Freddie Mac
Available-for-sale securities
Available for sale debt securities	2,721,717,000	32,371,700
Obligations of states and political subdivisions
Available-for-sale securities
Amortized cost, Available-for-sale securities	185,799,000	225,096,000
Gross Unrealized Gains	2,646,000	7,871,000
Gross Unrealized Losses	(105,000)	(16,000)
Obligations of states and political subdivisions | Assets/liabilities measured at fair value
Available-for-sale securities
Available for sale debt securities	188,340,000	232,951,000
Obligations of states and political subdivisions | Carrying Value
Available-for-sale securities
Available for sale debt securities	188,340,000	232,951,000
Other securities
Held-to-maturity securities
Amortized cost	1,200,000	2,400,000
Estimated fair value	1,200,000	2,400,000
Carrying Value	$ 1,200,000	2,400,000
Equity securities with readily determinable fair values
Available-for-sale securities
Amortized Cost, Equity securities		28,075,000
Gross Unrealized Gains, Equity securities		293,000
Gross Unrealized Losses, Equity securities		(482,000)
Equity securities with readily determinable fair values | Assets/liabilities measured at fair value
Available-for-sale securities
Equity Securities		27,886,000
Equity securities with readily determinable fair values | Carrying Value
Available-for-sale securities
Equity Securities		$ 27,886,000

Investment Securities (Contract

Investment Securities (Contractual Maturities and Estimated Fair Values) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Held-to-maturity debt securities amortized cost disclosures
Due after one year through five years, held-to-maturity debt securities amortized cost	$ 1,200,000
Amortized cost, held-to-maturity debt securities	1,200,000	$ 2,400,000
Held-to-maturity debt securities, Estimated fair value disclosures
Due after one year through five years, held-to-maturity debt securities, Estimated fair value	1,200,000
Estimated fair value	1,200,000	2,400,000
Available-for-sale debt securities amortized cost disclosures
Due after five years through ten years, available-for-sale debt securities amortized cost	500,000
Due after ten years, available-for-sale debt securities amortized cost	185,299,000
Residential mortgage-backed securities, amortized cost	3,295,366,000
Amortized cost, Available-for-sale securities	3,481,165,000	4,196,263,000
Available for sale debt securities, Estimated Fair Value Disclosures
Due after five years through ten years, available-for-sale debt securities, Estimated Fair Value	502,000
Due after ten years, available-for-sale debt securities, Estimated Fair Value	187,838,000
Residential mortgage-backed securities, Estimated Fair Value	3,223,010,000
Estimated fair value, Available for sale securities	3,411,350,000	4,124,184,000
Proceeds from sales and calls of available for sale securities	38,175,000	396,066,000	$ 352,743,000
Proceeds from sales of mortgage-backed securities	0	377,756,000	338,138,000
Gross gains realized on sales	3,000	1,186,000	586,000
Gross losses realized on sales	144,000	$ 5,960,000	$ 3,212,000
Collateral Pledged
Available-for-sale debt securities amortized cost disclosures
Amortized cost, Available-for-sale securities	1,112,852,000
Available for sale debt securities, Estimated Fair Value Disclosures
Fair value of available for sale investment securities pledged	$ 1,086,360,000

Investment Securities (Fair Val

Investment Securities (Fair Value and Gross Unrealized Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018
Available for sale:
Fair value, less than 12 months		$ 221,140
Marketable securities, less than 12 months	$ 1,078,610
Unrealized losses, less than 12 Months		(2,223)
Marketable securities, less than 12 Months	(13,417)
Fair value, 12 months or more		(2,537,693)
Marketable securities, 12 months or more	2,037,996
Unrealized losses, 12 Months or More		(77,051)
Marketable securities, 12 Months or More	(53,050)
Fair value, Total		2,758,833
Marketable securities, Total	(3,116,606)
Unrealized losses, Total		(79,274)
Marketable securities, Total	(66,467)
Residential mortgage-backed securities
Available for sale:
Fair value, less than 12 months	1,061,577	208,384
Unrealized losses, less than 12 Months	(13,157)	(2,124)
Fair value, 12 months or more	(2,029,455)	(2,537,181)
Unrealized losses, 12 Months or More	(52,812)	(77,045)
Fair value, Total	3,091,032	2,745,565
Unrealized losses, Total	(65,969)	(79,169)
Obligations of states and political subdivisions
Available for sale:
Fair value, less than 12 months	5,534	12,756
Unrealized losses, less than 12 Months	(9)	(99)
Fair value, 12 months or more	(522)	(512)
Unrealized losses, 12 Months or More	(7)	(6)
Fair value, Total	6,056	13,268
Unrealized losses, Total	(16)	$ (105)
Equity securities with readily determinable fair values
Available for sale:
Equity Securities, less than 12 months	11,499
Equity Securities, less than 12 Months	(251)
Equity Securities, 12 months or more	(8,019)
Equity Securities, 12 Months or More	(231)
Equity Securities, Total	(19,518)
Equity securities	$ (482)

Investment Securities (Reconcil

Investment Securities (Reconciliation of Credit Related Impairment Charges ) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of credit-related impairment charges on investments recognized in earnings
Impairment charges on available-for-sale investment securities, after tax	$ 354,000	$ 230,100
Available-for-sale investments
Reconciliation of credit-related impairment charges on investments recognized in earnings
Balance at the beginning	13,931,000	13,577,000
Sale of other-than-temporarily impaired available-for-sale securities during period	$ (13,931,000)
Impairment charges recognized during period		(354,000)
Balance at the end		$ 13,931,000

Investment Securities and Equit

Investment Securities and Equity Securities with Readily Determinable Fair Values (Unrealized and realized gains and losses recognized in net income on equity securities ) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Investment Securities
Equity Securities	$ 5,937,000	$ 27,886,000
Summary of unrealized and realized gains and losses recognized in net income on equity securities
Net losses recognized during the period on equity securities	(388,000)
Unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting date	(388,000)
Impairment charges on available-for-sale investment securities, after tax	$ 354,000	$ 230,100

Loans (Details)

Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Summary of loans, by loan type
Total loans	$ 6,561,289	$ 6,348,172
Commercial, financial and agricultural
Summary of loans, by loan type
Total loans	3,305,124	3,322,668
Real estate - mortgage
Summary of loans, by loan type
Total loans	1,173,101	1,133,525
Commercial Real Estate:Other Construction and Land Development
Summary of loans, by loan type
Total loans	1,886,231	1,683,550
Consumer
Summary of loans, by loan type
Total loans	46,316	49,543
Foreign
Summary of loans, by loan type
Total loans	$ 150,517	$ 158,886

Allowance for Probable Loan L_3

Allowance for Probable Loan Losses (By Loan Class) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for probable loan losses
Balance at the beginning of the period	$ 67,687	$ 64,661	$ 66,988
Losses charged to allowance	(15,125)	(13,098)	(35,901)
Recoveries credited to allowance	2,710	4,903	13,715
Net losses (recoveries) charged to allowance	(12,415)	(8,195)	(22,186)
Provision charged to operations	6,112	11,221	19,859
Balance at the end of the period	61,384	67,687	64,661
Watch - List Impaired
Allowance for probable loan losses
Losses charged to allowance			(19,400)
Commercial
Allowance for probable loan losses
Balance at the beginning of the period	27,905	25,649	21,431
Losses charged to allowance	(14,220)	(12,094)	(32,959)
Recoveries credited to allowance	1,981	4,020	7,110
Net losses (recoveries) charged to allowance	(12,239)	(8,074)	(25,849)
Provision charged to operations	(3,070)	10,330	30,067
Balance at the end of the period	12,596	27,905	25,649
Commercial Real Estate:Other Construction and Land Development
Allowance for probable loan losses
Balance at the beginning of the period	11,675	13,889	13,920
Losses charged to allowance	(1)	(213)	(16)
Recoveries credited to allowance	25	21	6,099
Net losses (recoveries) charged to allowance	24	(192)	6,083
Provision charged to operations	3,424	(2,022)	(6,114)
Balance at the end of the period	15,123	11,675	13,889
Commercial Real Estate: Farmland and Commercial
Allowance for probable loan losses
Balance at the beginning of the period	16,663	16,731	19,769
Losses charged to allowance	(70)	(40)	(1,890)
Recoveries credited to allowance	246	527	119
Net losses (recoveries) charged to allowance	176	487	(1,771)
Provision charged to operations	2,514	(555)	(1,267)
Balance at the end of the period	19,353	16,663	16,731
Commercial Real Estate: Multifamily
Allowance for probable loan losses
Balance at the beginning of the period	1,109	806	1,248
Losses charged to allowance			(180)
Net losses (recoveries) charged to allowance			(180)
Provision charged to operations	699	303	(262)
Balance at the end of the period	1,808	1,109	806
Residential First Lien
Allowance for probable loan losses
Balance at the beginning of the period	2,950	2,455	3,509
Losses charged to allowance	(122)	(101)	(70)
Recoveries credited to allowance	36	11	21
Net losses (recoveries) charged to allowance	(86)	(90)	(49)
Provision charged to operations	603	585	(1,005)
Balance at the end of the period	3,467	2,950	2,455
Residential Junior Lien
Allowance for probable loan losses
Balance at the beginning of the period	6,103	3,716	5,321
Losses charged to allowance	(347)	(340)	(331)
Recoveries credited to allowance	369	258	278
Net losses (recoveries) charged to allowance	22	(82)	(53)
Provision charged to operations	1,594	2,469	(1,552)
Balance at the end of the period	7,719	6,103	3,716
Consumer
Allowance for probable loan losses
Balance at the beginning of the period	440	531	638
Losses charged to allowance	(362)	(309)	(414)
Recoveries credited to allowance	43	45	69
Net losses (recoveries) charged to allowance	(319)	(264)	(345)
Provision charged to operations	326	173	238
Balance at the end of the period	447	440	531
Foreign
Allowance for probable loan losses
Balance at the beginning of the period	842	884	1,152
Losses charged to allowance	(3)	(1)	(41)
Recoveries credited to allowance	10	21	19
Net losses (recoveries) charged to allowance	7	20	(22)
Provision charged to operations	22	(62)	(246)
Balance at the end of the period	$ 871	$ 842	$ 884

Allowance for Probable Loan L_4

Allowance for Probable Loan Losses (Impairment By Loan Class) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans Individually Evaluated for Impairment, Recorded Investment	$ 23,900	$ 63,204
Loans Individually Evaluated for Impairment, Allowance	772	434
Loans Collectively Evaluated for Impairment, Recorded Investment	6,537,389	6,284,968
Loans Collectively Evaluated for Impairment, Allowance	60,612	67,253
Commercial
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans Individually Evaluated for Impairment, Recorded Investment	9,179	17,947
Loans Individually Evaluated for Impairment, Allowance	656	300
Loans Collectively Evaluated for Impairment, Recorded Investment	1,119,790	1,068,520
Loans Collectively Evaluated for Impairment, Allowance	11,940	27,605
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	2,092	2,455
Loans Individually Evaluated for Impairment, Allowance	116	116
Loans Collectively Evaluated for Impairment, Recorded Investment	1,884,139	1,681,095
Loans Collectively Evaluated for Impairment, Allowance	15,007	11,559
Commercial Real Estate: Farmland and Commercial
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans Individually Evaluated for Impairment, Recorded Investment	3,509	33,123
Loans Individually Evaluated for Impairment, Allowance		18
Loans Collectively Evaluated for Impairment, Recorded Investment	1,946,389	2,010,162
Loans Collectively Evaluated for Impairment, Allowance	19,353	16,645
Commercial Real Estate: Multifamily
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans Individually Evaluated for Impairment, Recorded Investment	507	476
Loans Collectively Evaluated for Impairment, Recorded Investment	225,750	192,440
Loans Collectively Evaluated for Impairment, Allowance	1,808	1,109
Residential First Lien
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans Individually Evaluated for Impairment, Recorded Investment	6,244	6,852
Loans Collectively Evaluated for Impairment, Recorded Investment	439,556	425,925
Loans Collectively Evaluated for Impairment, Allowance	3,467	2,950
Residential Junior Lien
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans Individually Evaluated for Impairment, Recorded Investment	901	723
Loans Collectively Evaluated for Impairment, Recorded Investment	726,400	700,025
Loans Collectively Evaluated for Impairment, Allowance	7,719	6,103
Consumer
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans Individually Evaluated for Impairment, Recorded Investment	1,175	1,281
Loans Collectively Evaluated for Impairment, Recorded Investment	45,141	48,262
Loans Collectively Evaluated for Impairment, Allowance	447	440
Foreign
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans Individually Evaluated for Impairment, Recorded Investment	293	347
Loans Collectively Evaluated for Impairment, Recorded Investment	150,224	158,539
Loans Collectively Evaluated for Impairment, Allowance	$ 871	$ 842

Allowance for Probable Loan L_5

Allowance for Probable Loan Losses (Non-accrual Basis By Loan Class) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Loan loss allowances, financing receivable past due
Non-accrual loans, total	$ 15,791,000	$ 54,730,000	$ 37,245,000
Reduced interest income on non-accrual loans	1,119,000	977,000	$ 2,461,000
Commercial
Loan loss allowances, financing receivable past due
Non-accrual loans, total	9,143,000	17,909,000
Commercial Real Estate:Other Construction and Land Development
Loan loss allowances, financing receivable past due
Non-accrual loans, total	2,092,000	2,455,000
Commercial Real Estate: Farmland and Commercial
Loan loss allowances, financing receivable past due
Non-accrual loans, total	3,509,000	33,123,000
Commercial Real Estate: Multifamily
Loan loss allowances, financing receivable past due
Non-accrual loans, total	507,000	476,000
Residential First Lien
Loan loss allowances, financing receivable past due
Non-accrual loans, total	347,000	712,000
Residential Junior Lien
Loan loss allowances, financing receivable past due
Non-accrual loans, total	171,000	11,000
Consumer
Loan loss allowances, financing receivable past due
Non-accrual loans, total	$ 22,000	$ 44,000

Allowance for Probable Loan L_6

Allowance for Probable Loan Losses (Impaired Loans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Interest Recognized
Total trouble debt restructuring	$ 8,158	$ 15,346
Period of charge off for past due unsecured commercial loans	90 days
Class of Financing Receivable
Recorded investment:
Total impaired loans with related allowance	$ 1,698	1,894
Total impaired loans with no related allowance	22,202	61,310
Unpaid principal balance:
Total impaired loans with an allowance recorded	2,330	2,336
Total impaired loans with no related allowance recorded	23,284	89,664
Related Allowance	772	434
Average recorded investment:
Total impaired loans with an allowance recorded	1,882	1,985
Total impaired loans with no related allowance recorded	65,192	72,417
Interest Recognized
Total impaired loans with no related allowance recorded	368	391
Commercial
Interest Recognized
Total trouble debt restructuring	35	6,910
Commercial | Class of Financing Receivable
Recorded investment:
Total impaired loans with related allowance	1,563
Total impaired loans with no related allowance	7,616	16,646
Unpaid principal balance:
Total impaired loans with an allowance recorded	2,161
Total impaired loans with no related allowance recorded	7,730	44,095
Related Allowance	656
Average recorded investment:
Total impaired loans with an allowance recorded	1,741
Total impaired loans with no related allowance recorded	16,194	19,615
Interest Recognized
Total impaired loans with no related allowance recorded	3	3
Commercial Real Estate:Other Construction and Land Development | Class of Financing Receivable
Recorded investment:
Total impaired loans with related allowance	135	1,300
Total impaired loans with no related allowance	1,957	2,310
Unpaid principal balance:
Total impaired loans with an allowance recorded	169	1,577
Total impaired loans with no related allowance recorded	2,205	2,455
Related Allowance	116	300
Average recorded investment:
Total impaired loans with an allowance recorded	141	1,346
Total impaired loans with no related allowance recorded	2,151	3,493
Commercial Real Estate: Farmland and Commercial | Class of Financing Receivable
Recorded investment:
Total impaired loans with related allowance		145
Total impaired loans with no related allowance	3,509	32,675
Unpaid principal balance:
Total impaired loans with an allowance recorded		169
Total impaired loans with no related allowance recorded	4,031	33,275
Related Allowance		116
Average recorded investment:
Total impaired loans with an allowance recorded		150
Total impaired loans with no related allowance recorded	36,632	38,536
Commercial Real Estate: Multifamily | Class of Financing Receivable
Recorded investment:
Total impaired loans with related allowance		449
Total impaired loans with no related allowance	507	476
Unpaid principal balance:
Total impaired loans with an allowance recorded		590
Total impaired loans with no related allowance recorded	538	505
Related Allowance		18
Average recorded investment:
Total impaired loans with an allowance recorded		489
Total impaired loans with no related allowance recorded	565	511
Residential First Lien
Interest Recognized
Total trouble debt restructuring	5,947	6,140
Residential First Lien | Class of Financing Receivable
Recorded investment:
Total impaired loans with no related allowance	6,244	6,852
Unpaid principal balance:
Total impaired loans with no related allowance recorded	6,386	6,968
Average recorded investment:
Total impaired loans with no related allowance recorded	7,136	7,249
Interest Recognized
Total impaired loans with no related allowance recorded	305	324
Residential Junior Lien
Interest Recognized
Total trouble debt restructuring	730	712
Residential Junior Lien | Class of Financing Receivable
Recorded investment:
Total impaired loans with no related allowance	901	723
Unpaid principal balance:
Total impaired loans with no related allowance recorded	911	736
Average recorded investment:
Total impaired loans with no related allowance recorded	976	970
Interest Recognized
Total impaired loans with no related allowance recorded	44	45
Consumer
Interest Recognized
Total trouble debt restructuring	1,153	1,237
Consumer | Class of Financing Receivable
Recorded investment:
Total impaired loans with no related allowance	1,175	1,281
Unpaid principal balance:
Total impaired loans with no related allowance recorded	1,190	1,283
Average recorded investment:
Total impaired loans with no related allowance recorded	1,211	1,293
Interest Recognized
Total impaired loans with no related allowance recorded	2	3
Foreign
Interest Recognized
Total trouble debt restructuring	293	347
Foreign | Class of Financing Receivable
Recorded investment:
Total impaired loans with no related allowance	293	347
Unpaid principal balance:
Total impaired loans with no related allowance recorded	293	347
Average recorded investment:
Total impaired loans with no related allowance recorded	327	750
Interest Recognized
Total impaired loans with no related allowance recorded	$ 14	$ 16

Allowance for Probable Loan L_7

Allowance for Probable Loan Losses (Aging By Loan Class) (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financing receivable recorded investment
Past due 90 days or Greater and Still Accruing	$ 40,674,000	$ 7,257,000	$ 5,226,000
Past due	75,833,000	77,053,000
Loans, current	6,485,456,000	6,271,119,000
Total loans	6,561,289,000	6,348,172,000
30 to 59 Days
Financing receivable recorded investment
Past due	15,978,000	15,855,000
60 to 89 Days
Financing receivable recorded investment
Past due	6,011,000	4,429,000
90 Days or Greater
Financing receivable recorded investment
Past due	53,844,000	56,769,000
Commercial
Financing receivable recorded investment
Past due 90 days or Greater and Still Accruing	10,890,000	537,000
Past due	25,591,000	22,496,000
Loans, current	1,103,378,000	1,063,971,000
Total loans	1,128,969,000	1,086,467,000
Commercial | 30 to 59 Days
Financing receivable recorded investment
Past due	4,651,000	3,790,000
Commercial | 60 to 89 Days
Financing receivable recorded investment
Past due	1,089,000	398,000
Commercial | 90 Days or Greater
Financing receivable recorded investment
Past due	19,851,000	18,308,000
Commercial Real Estate:Other Construction and Land Development
Financing receivable recorded investment
Past due 90 days or Greater and Still Accruing	16,000	6,000
Past due	3,356,000	1,482,000
Loans, current	1,882,875,000	1,682,068,000
Total loans	1,886,231,000	1,683,550,000
Commercial Real Estate:Other Construction and Land Development | 30 to 59 Days
Financing receivable recorded investment
Past due	727,000	354,000
Commercial Real Estate:Other Construction and Land Development | 60 to 89 Days
Financing receivable recorded investment
Past due	1,707,000	308,000
Commercial Real Estate:Other Construction and Land Development | 90 Days or Greater
Financing receivable recorded investment
Past due	922,000	820,000
Commercial Real Estate: Farmland and Commercial
Financing receivable recorded investment
Past due 90 days or Greater and Still Accruing	24,910,000	954,000
Past due	30,951,000	35,576,000
Loans, current	1,918,947,000	2,007,709,000
Total loans	1,949,898,000	2,043,285,000
Commercial Real Estate: Farmland and Commercial | 30 to 59 Days
Financing receivable recorded investment
Past due	2,928,000	3,925,000
Commercial Real Estate: Farmland and Commercial | 60 to 89 Days
Financing receivable recorded investment
Past due	784,000	518,000
Commercial Real Estate: Farmland and Commercial | 90 Days or Greater
Financing receivable recorded investment
Past due	27,239,000	31,133,000
Commercial Real Estate: Multifamily
Financing receivable recorded investment
Past due 90 days or Greater and Still Accruing	71,000
Past due	1,505,000	560,000
Loans, current	224,752,000	192,356,000
Total loans	226,257,000	192,916,000
Commercial Real Estate: Multifamily | 30 to 59 Days
Financing receivable recorded investment
Past due	927,000	84,000
Commercial Real Estate: Multifamily | 90 Days or Greater
Financing receivable recorded investment
Past due	578,000	476,000
Residential First Lien
Financing receivable recorded investment
Past due 90 days or Greater and Still Accruing	3,079,000	3,861,000
Past due	9,037,000	10,848,000
Loans, current	436,763,000	421,929,000
Total loans	445,800,000	432,777,000
Residential First Lien | 30 to 59 Days
Financing receivable recorded investment
Past due	3,998,000	4,295,000
Residential First Lien | 60 to 89 Days
Financing receivable recorded investment
Past due	1,677,000	2,458,000
Residential First Lien | 90 Days or Greater
Financing receivable recorded investment
Past due	3,362,000	4,095,000
Residential Junior Lien
Financing receivable recorded investment
Past due 90 days or Greater and Still Accruing	937,000	1,099,000
Past due	2,881,000	3,000,000
Loans, current	724,420,000	697,748,000
Total loans	727,301,000	700,748,000
Residential Junior Lien | 30 to 59 Days
Financing receivable recorded investment
Past due	1,155,000	1,310,000
Residential Junior Lien | 60 to 89 Days
Financing receivable recorded investment
Past due	618,000	580,000
Residential Junior Lien | 90 Days or Greater
Financing receivable recorded investment
Past due	1,108,000	1,110,000
Consumer
Financing receivable recorded investment
Past due 90 days or Greater and Still Accruing	32,000	133,000
Past due	550,000	1,126,000
Loans, current	45,766,000	48,417,000
Total loans	46,316,000	49,543,000
Consumer | 30 to 59 Days
Financing receivable recorded investment
Past due	486,000	868,000
Consumer | 60 to 89 Days
Financing receivable recorded investment
Past due	19,000	98,000
Consumer | 90 Days or Greater
Financing receivable recorded investment
Past due	45,000	160,000
Foreign
Financing receivable recorded investment
Past due 90 days or Greater and Still Accruing	739,000	667,000
Past due	1,962,000	1,965,000
Loans, current	148,555,000	156,921,000
Total loans	150,517,000	158,886,000
Foreign | 30 to 59 Days
Financing receivable recorded investment
Past due	1,106,000	1,229,000
Foreign | 60 to 89 Days
Financing receivable recorded investment
Past due	117,000	69,000
Foreign | 90 Days or Greater
Financing receivable recorded investment
Past due	$ 739,000	$ 667,000

Allowance for Probable Loan L_8

Allowance for Probable Loan Losses (Portfolio Credit Quality By Loan Class) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Loan portfolio by credit quality indicator
Portfolio, total	$ 6,561,289	$ 6,348,172
Pass
Loan portfolio by credit quality indicator
Portfolio, total	6,126,933	5,911,001
Special Review
Loan portfolio by credit quality indicator
Portfolio, total	64,135	6,612
Watch List - Pass
Loan portfolio by credit quality indicator
Portfolio, total	92,976	45,662
Watch List - Substandard
Loan portfolio by credit quality indicator
Portfolio, total	253,345	321,693
Watch - List Impaired
Loan portfolio by credit quality indicator
Portfolio, total	23,900	63,204
Commercial
Loan portfolio by credit quality indicator
Portfolio, total	1,128,969	1,086,467
Commercial | Pass
Loan portfolio by credit quality indicator
Portfolio, total	998,625	905,707
Commercial | Special Review
Loan portfolio by credit quality indicator
Portfolio, total	441
Commercial | Watch List - Pass
Loan portfolio by credit quality indicator
Portfolio, total	44,544	3,170
Commercial | Watch List - Substandard
Loan portfolio by credit quality indicator
Portfolio, total	76,180	159,643
Commercial | Watch - List Impaired
Loan portfolio by credit quality indicator
Portfolio, total	9,179	17,947
Commercial Real Estate:Other Construction and Land Development
Loan portfolio by credit quality indicator
Portfolio, total	1,886,231	1,683,550
Commercial Real Estate:Other Construction and Land Development | Pass
Loan portfolio by credit quality indicator
Portfolio, total	1,817,098	1,616,604
Commercial Real Estate:Other Construction and Land Development | Special Review
Loan portfolio by credit quality indicator
Portfolio, total	1,648	1,288
Commercial Real Estate:Other Construction and Land Development | Watch List - Pass
Loan portfolio by credit quality indicator
Portfolio, total	9,055	672
Commercial Real Estate:Other Construction and Land Development | Watch List - Substandard
Loan portfolio by credit quality indicator
Portfolio, total	56,338	62,531
Commercial Real Estate:Other Construction and Land Development | Watch - List Impaired
Loan portfolio by credit quality indicator
Portfolio, total	2,092	2,455
Commercial Real Estate: Farmland and Commercial
Loan portfolio by credit quality indicator
Portfolio, total	1,949,898	2,043,285
Commercial Real Estate: Farmland and Commercial | Pass
Loan portfolio by credit quality indicator
Portfolio, total	1,726,711	1,863,763
Commercial Real Estate: Farmland and Commercial | Special Review
Loan portfolio by credit quality indicator
Portfolio, total	62,046	5,134
Commercial Real Estate: Farmland and Commercial | Watch List - Pass
Loan portfolio by credit quality indicator
Portfolio, total	38,373	41,820
Commercial Real Estate: Farmland and Commercial | Watch List - Substandard
Loan portfolio by credit quality indicator
Portfolio, total	119,259	99,445
Commercial Real Estate: Farmland and Commercial | Watch - List Impaired
Loan portfolio by credit quality indicator
Portfolio, total	3,509	33,123
Commercial Real Estate: Multifamily
Loan portfolio by credit quality indicator
Portfolio, total	226,257	192,916
Commercial Real Estate: Multifamily | Pass
Loan portfolio by credit quality indicator
Portfolio, total	224,823	192,440
Commercial Real Estate: Multifamily | Watch List - Substandard
Loan portfolio by credit quality indicator
Portfolio, total	927
Commercial Real Estate: Multifamily | Watch - List Impaired
Loan portfolio by credit quality indicator
Portfolio, total	507	476
Residential First Lien
Loan portfolio by credit quality indicator
Portfolio, total	445,800	432,777
Residential First Lien | Pass
Loan portfolio by credit quality indicator
Portfolio, total	438,773	425,811
Residential First Lien | Special Review
Loan portfolio by credit quality indicator
Portfolio, total		40
Residential First Lien | Watch List - Pass
Loan portfolio by credit quality indicator
Portfolio, total	142
Residential First Lien | Watch List - Substandard
Loan portfolio by credit quality indicator
Portfolio, total	641	74
Residential First Lien | Watch - List Impaired
Loan portfolio by credit quality indicator
Portfolio, total	6,244	6,852
Residential Junior Lien
Loan portfolio by credit quality indicator
Portfolio, total	727,301	700,748
Residential Junior Lien | Pass
Loan portfolio by credit quality indicator
Portfolio, total	725,538	699,875
Residential Junior Lien | Special Review
Loan portfolio by credit quality indicator
Portfolio, total		150
Residential Junior Lien | Watch List - Pass
Loan portfolio by credit quality indicator
Portfolio, total	862
Residential Junior Lien | Watch - List Impaired
Loan portfolio by credit quality indicator
Portfolio, total	901	723
Consumer
Loan portfolio by credit quality indicator
Portfolio, total	46,316	49,543
Consumer | Pass
Loan portfolio by credit quality indicator
Portfolio, total	45,141	48,262
Consumer | Watch - List Impaired
Loan portfolio by credit quality indicator
Portfolio, total	1,175	1,281
Foreign
Loan portfolio by credit quality indicator
Portfolio, total	150,517	158,886
Foreign | Pass
Loan portfolio by credit quality indicator
Portfolio, total	150,224	158,539
Foreign | Watch - List Impaired
Loan portfolio by credit quality indicator
Portfolio, total	$ 293	$ 347

Bank Premises and Equipment (De

Bank Premises and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Bank premises and equipment
Less: accumulated depreciation	$ (468,167)	$ (448,470)
Bank premises and equipment, net	506,899	514,454
Bank Building and Improvements
Bank premises and equipment
Bank premises and equipment, gross	$ 563,302	550,094
Bank Building and Improvements | Minimum
Bank premises and equipment
Estimated useful lives	5 years
Bank Building and Improvements | Maximum
Bank premises and equipment
Estimated useful lives	40 years
Furniture, Equipment and Vehicles
Bank premises and equipment
Bank premises and equipment, gross	$ 292,958	289,743
Furniture, Equipment and Vehicles | Minimum
Bank premises and equipment
Estimated useful lives	1 year
Furniture, Equipment and Vehicles | Maximum
Bank premises and equipment
Estimated useful lives	20 years
Land
Bank premises and equipment
Bank premises and equipment, gross	$ 118,806	$ 123,087
Land, Building, Furniture, Fixture and Equipment | Minimum
Bank premises and equipment
Estimated useful lives	7 years
Land, Building, Furniture, Fixture and Equipment | Maximum
Bank premises and equipment
Estimated useful lives	27 years

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Identified intangible assets
Carrying Amount	$ 60,697	$ 60,697
Accumulated Amortization	60,697	60,697
Amortization expense		25	$ 128
Changes in carrying amount of goodwill	0	0
Core deposit premium
Identified intangible assets
Carrying Amount	58,675	58,675
Accumulated Amortization	58,675	58,675
Identified intangible (contract rights)
Identified intangible assets
Carrying Amount	2,022	2,022
Accumulated Amortization	$ 2,022	$ 2,022

Deposits (Details)

Deposits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Demand non-interest bearing
Domestic	$ 2,758,768	$ 2,609,932
Foreign	696,072	633,323
Total demand non-interest bearing	3,454,840	3,243,255
Savings and interest bearing demand
Domestic	2,531,854	2,615,143
Foreign	736,383	629,988
Total savings and interest bearing demand	3,268,237	3,245,131
$100,000 or more
Time, certificate of deposit	1,398,381
Less than $100,000
Domestic	323,377	354,998
Foreign	251,710	255,621
Total time, certificates of deposit	1,973,468	2,056,506
Total deposits	8,696,545	8,544,892
Savings and interest bearing demand
Domestic	11,029	5,453	$ 3,922
Foreign	1,735	755	640
Total savings and interest bearing demand	12,764	6,208	4,562
$100,000 or more
Domestic	4,741	3,644	3,881
Foreign	5,798	4,105	3,929
Less than $100,000
Domestic	1,589	1,312	1,447
Foreign	968	675	706
Total time, certificates of deposit	13,096	9,736	9,963
Total interest expense on deposits	25,860	15,944	$ 14,525
Domestic
$100,000 or more
Time, certificate of deposit	590,895	637,006
Foreign
$100,000 or more
Time, certificate of deposit	$ 807,486	$ 808,881

Deposits (Scheduled Maturities)

Deposits (Scheduled Maturities) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Scheduled maturities of time deposits
2,019	$ 1,786,776
2,020	138,105
2,021	31,665
2,022	15,717
2,023	1,096
Thereafter	109
Total time, certificates of deposit	1,973,468	$ 2,056,506
Time Deposits 250,000 or exceed	869,000	$ 894,000
Scheduled maturities of time deposits in amounts of $100,000 or more
Due within 3 months or less	500,836
Due after 3 months and within 6 months	337,349
Due after 6 months and within 12 months	433,628
Due after 12 months	126,568
Total	$ 1,398,381

Securities Sold Under Repurch_3

Securities Sold Under Repurchase Agreements (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Collateral Securities and Repurchase Borrowing agreements
Average outstanding amount	$ 314,876,000	$ 402,396,000
Maximum amount outstanding at any month end	370,495,000	514,616,000
Collateralized Securities, Book Value of Securities Sold	369,086,000	460,681,000
Collateralized securities, Fair Value of Securities Sold	360,177,000	452,912,000
Repurchase Borrowing, Balance of Liability	$ 229,989,000	$ 353,805,000
Repurchase Borrowing, Weighted Average Interest Rate (as a percent)	0.87%	1.32%
Overnight agreements
Collateral Securities and Repurchase Borrowing agreements
Collateralized Securities, Book Value of Securities Sold	$ 357,642,000	$ 340,054,000
Collateralized securities, Fair Value of Securities Sold	349,081,000	334,506,000
Repurchase Borrowing, Balance of Liability	$ 218,852,000	$ 242,824,000
Repurchase Borrowing, Weighted Average Interest Rate (as a percent)	0.85%	0.25%
30 to 90 days
Collateral Securities and Repurchase Borrowing agreements
Collateralized Securities, Book Value of Securities Sold		$ 109,300,000
Collateralized securities, Fair Value of Securities Sold		107,238,000
Repurchase Borrowing, Balance of Liability		$ 100,000,000
Repurchase Borrowing, Weighted Average Interest Rate (as a percent)		3.99%
Over 90 days
Collateral Securities and Repurchase Borrowing agreements
Collateralized Securities, Book Value of Securities Sold	$ 11,444,000	$ 11,327,000
Collateralized securities, Fair Value of Securities Sold	11,096,000	11,168,000
Repurchase Borrowing, Balance of Liability	$ 11,137,000	$ 10,981,000
Repurchase Borrowing, Weighted Average Interest Rate (as a percent)	1.27%	0.74%

Other Borrowed Funds (Details)

Other Borrowed Funds (Details)	12 Months Ended
	Dec. 31, 2018USD ($)loan	Dec. 31, 2017USD ($)
Federal Home Loan Bank advances
Other borrowed funds	$ 705,665,000	$ 1,195,225,000
Federal home loan bank advances maturing November 2027
Federal Home Loan Bank advances
Other borrowed funds	100,000,000
Federal home loan Bank advances maturing December 2027
Federal Home Loan Bank advances
Other borrowed funds	150,000,000
Federal Home Loan Bank advances - short-term
Federal Home Loan Bank advances
Other borrowed funds	$ 268,975,000	$ 945,225,000
Rate on balance outstanding at year end (as a percent)	2.70%	1.44%
Average daily balance	$ 621,357,000	$ 839,858,000
Average rate (as a percent)	1.97%	1.23%
Maximum amount outstanding at any month end	$ 1,007,100,000	$ 1,043,250,000
Federal Home Loan Bank advances - long-term
Federal Home Loan Bank advances
Other borrowed funds	$ 436,690,000	$ 250,000,000
Rate on balance outstanding at year end (as a percent)	1.73%	1.26%
Average daily balance	$ 302,373,000	$ 51,644,000
Average rate (as a percent)	1.71%	1.26%
Maximum amount outstanding at any month end	$ 436,700,000	$ 250,000,000
Federal Home Loan Bank advances - long-term | Federal Home Loan Bank advances maturing July 2028
Federal Home Loan Bank advances
Other borrowed funds	75,000,000,000
Federal Home Loan Bank advances - long-term | Federal Home Loan Bank advances maturing March 2033
Federal Home Loan Bank advances
Other borrowed funds	100,000,000,000
Federal Home Loan Bank advances - long-term | Federal Home Loan Bank advances maturing August 2033
Federal Home Loan Bank advances
Other borrowed funds	$ 250,000,000,000
Federal Home Loan Bank advances - long-term | Federal Home Loan Bank amortizing advances
Federal Home Loan Bank advances
Number of amortizing advances | loan	2
Amortizing in 2019	$ 179,000,000
Amortizing in 2020	179,000,000
Amortizing in 2021	179,000,000
Amortizing in 2022	179,000,000
Amortizing in 2023	179,000,000
Federal Home Loan Bank advances - long-term | Federal Home Loan Bank advances maturing December 2033
Federal Home Loan Bank advances
Other borrowed funds	3,200,000,000
Federal Home Loan Bank advances - long-term | Federal Home Loan Bank advances maturing November 2033
Federal Home Loan Bank advances
Other borrowed funds	$ 8,490,000,000

Junior Subordinated Deferrable

Junior Subordinated Deferrable Interest Debentures (Details)	12 Months Ended
	Dec. 31, 2018USD ($)item	Dec. 31, 2017USD ($)
Junior subordinated deferrable interest debentures, major types of business trusts
Number of statutory business trusts issuing trust preferred securities | item	6
Junior subordinated deferrable interest debentures	$ 160,416,000	$ 160,416,000
Maximum number of consecutive quarterly period available for deferral of interest payment on Trusts VI, 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	$ 160,416,000	$ 160,416,000
Trust XI
Junior subordinated deferrable interest debentures, major types of business trusts
Junior subordinated deferrable interest debentures	25,990,000
Trust X
Junior subordinated deferrable interest debentures, major types of business trusts
Junior subordinated deferrable interest debentures	$ 21,021,000

Junior Subordinated Deferrabl_2

Junior Subordinated Deferrable Interest Debentures (Key Information) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Junior subordinated deferrable interest debentures, major types of business trusts
Junior subordinated deferrable interest debentures	$ 160,416,000	$ 160,416,000
Trust VI
Junior subordinated deferrable interest debentures, major types of business trusts
Junior subordinated deferrable interest debentures	$ 25,774,000
Interest rate (as a percent)	6.07%
Interest rate index	LIBOR
Spread on interest rate index (as a percent)	3.45%
Trust VIII
Junior subordinated deferrable interest debentures, major types of business trusts
Junior subordinated deferrable interest debentures	$ 25,774,000
Interest rate (as a percent)	5.49%
Interest rate index	LIBOR
Spread on interest rate index (as a percent)	3.05%
Trust IX
Junior subordinated deferrable interest debentures, major types of business trusts
Junior subordinated deferrable interest debentures	$ 41,238,000
Interest rate (as a percent)	4.02%
Interest rate index	LIBOR
Spread on interest rate index (as a percent)	1.62%
Trust X
Junior subordinated deferrable interest debentures, major types of business trusts
Junior subordinated deferrable interest debentures	$ 21,021,000
Interest rate (as a percent)	4.19%
Interest rate index	LIBOR
Spread on interest rate index (as a percent)	1.65%
Trust XI
Junior subordinated deferrable interest debentures, major types of business trusts
Junior subordinated deferrable interest debentures	$ 25,990,000
Interest rate (as a percent)	4.02%
Interest rate index	LIBOR
Spread on interest rate index (as a percent)	1.62%
Trust XII
Junior subordinated deferrable interest debentures, major types of business trusts
Junior subordinated deferrable interest debentures	$ 20,619,000
Interest rate (as a percent)	4.19%
Interest rate index	LIBOR
Spread on interest rate index (as a percent)	1.45%

Earnings per Share ("EPS") (Det

Earnings per Share ("EPS") (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Basic EPS
Net income	$ 215,931	$ 157,436	$ 133,932
Shares (Denominator)	66,106,580	66,046,155	65,967,989
Per Share Amount	$ 3.27	$ 2.38	$ 2.03
Diluted EPS
Net Income	$ 215,931	$ 157,436	$ 133,932
Potential dilutive common shares and warrants	527,240	732,281	345,501
Shares (Denominator)	66,633,820	66,778,436	66,313,490
Per Share Amount (in dollars per share)	$ 3.24	$ 2.36	$ 2.02

Employees' Profit Sharing Plan

Employees' Profit Sharing Plan (Details) - Deferred profit sharing plan - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Employees' profit sharing plan
Minimum period of continuous employment to be fully vested	1 year
Profit sharing costs	$ 3,850,000	$ 3,750,000	$ 3,650,000

International Operations (Detai

International Operations (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Loans:
Loans	$ 6,561,289,000	$ 6,348,172,000
Less allowance for probable loan losses	(61,384,000)	(67,687,000)	$ (64,661,000)	$ (66,988,000)
Net loans	6,499,905,000	6,280,485,000
Accrued interest receivable	36,803,000	34,456,000
International Banking Services
Loans:
Accrued interest receivable	811,000	671,000
Outstanding standby and commercial letters of credit	119,302,000
Revenues	5,412,000	5,248,000	$ 5,495,000
International Banking Services | Foreign
Loans:
Loans	150,517,000	158,886,000
Less allowance for probable loan losses	(871,000)	(842,000)
Net loans	149,646,000	158,044,000
International Banking Services | Foreign | Commercial
Loans:
Loans	101,955,000	113,019,000
International Banking Services | Foreign | Others
Loans:
Loans	$ 48,562,000	$ 45,867,000

Income Taxes (Current and Defer

Income Taxes (Current and Deferred Portions of Net Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current
U.S.	$ 48,144	$ 56,974	$ 52,403
State	3,370	2,662	3,362
Foreign	(5)
Total current taxes	51,509	59,636	55,765
Deferred
U.S.	5,130	4,620	7,279
State	13	(50)	27
Total deferred taxes	5,143	4,570	7,306
Total income taxes	$ 56,652	$ 64,206	$ 63,071

Income Taxes (Income Tax Expens

Income Taxes (Income Tax Expense Differences from the Amount Computed by Applying the U.S. Federal Income Tax Rate) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes
U.S. Federal income tax rate (as a percent)	21.00%	35.00%	35.00%
Reasons for the difference of income tax expense
Computed expected tax expense	$ 57,831	$ 77,643	$ 69,253
Change in taxes resulting from:
Tax-exempt interest income	(3,101)	(4,701)	(3,940)
State tax, net of federal income taxes and tax credit and refunds	2,673	1,697	3,287
Resolution of IRS exam		(4,985)
Other investment income	(1,561)	(3,198)	(3,694)
Deferred tax adjustment due to federal tax rate change	(1,618)	(3,168)
Net investment expense, low income housing investment	2,518	387
Other	(90)	531	(1,835)
Total income taxes	$ 56,652	$ 64,206	$ 63,071

Income Taxes (Deferred Tax Asse

Income Taxes (Deferred Tax Assets and Deferred Tax Liabilities) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Loans receivable, principally due to the allowance for probable loan losses	$ 12,257,000	$ 14,546,000
Other real estate owned	2,459,000	2,053,000
Impairment charges on available-for-sale securities	1,054,000	844,000
Accrued expenses	81,000	81,000
Net unrealized losses on available for sale investment securities	15,182,000	9,680,000
Other	5,076,000	4,434,000
Total deferred tax assets	36,109,000	31,638,000
Deferred tax liabilities:
Bank premises and equipment, principally due to differences on depreciation	(12,596,000)	(10,940,000)
Identified intangible assets and goodwill	(13,490,000)	(13,417,000)
Other	(14,787,000)	(12,474,000)
Total deferred tax liabilities	40,873,000	36,831,000
Net deferred tax liability	$ (4,764,000)	$ (5,193,000)
U.S. Federal income tax rate (as a percent)	21.00%	35.00%	35.00%
Net benefit due to change in tax rate	$ 4,786,000

Stock Options (Details)

Stock Options (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Apr. 05, 2012
Stock options under 2012 Plan
Stock option details
Shares available for future grants	10,700			800,000
Maximum exercisable period for options granted	10 years
Black-Scholes-Merton option valuation model assumptions
Expected Life (Years)	7 years
Dividend yield (as a percent)	1.73%
Interest rate (as a percent)	2.68%
Volatility (as a percent)	31.65%
Number of options granted (in shares)	234,700	0
Stock option activity
Options outstanding at the beginning of the period (in shares)	668,166
Plus: Options granted (in shares)	234,700	0
Less:
Options exercised (in shares)	84,701
Options forfeited (in shares)	29,188
Options outstanding at the end of the period (in shares)	788,977	668,166
Options fully vested and exercisable at the end of the period (in shares)	310,108
Stock Options, Weighted average exercise price
Options outstanding at the beginning, weighted average exercise price (in dollars per share)	$ 20.41
Plus: Options granted, weighted average exercise price (in dollars per share)	38.27
Less:
Options exercised, weighted average exercise price (in dollars per share)	17.89
Options forfeited, weighted average exercise price (in dollars per share)	22.73
Options outstanding at the end, weighted average exercise price (in dollars per share)	25.91	$ 20.41
Options fully vested and exercisable at the end, weighted average exercise price (in dollars per share)	$ 19.93
Stock Options, Weighted average remaining contractual term (years)
Options outstanding at the end, weighted average remaining contractual term (years)	6 years 26 days
Options fully vested and exercisable at the end, weighted average remaining contractual term (years)	4 years 2 months 16 days
Stock Options, Aggregate intrinsic value
Options outstanding at the end, aggregate intrinsic value	$ 7,587,000
Options fully vested and exercisable at the end, aggregate intrinsic value	4,486,000
Stock-based compensation expense	1,035,000	$ 903,000	$ 1,082,000
Stock-based compensation cost, unrecognized, related to non-vested options	$ 2,798,000
Stock-based compensation cost, unrecognized, related to non-vested options, weighted-average period of recognition	2 years 1 month 6 days
Other information pertaining to option activity
Weighted average grant date fair value of stock options granted (in dollars per share)	$ 11.78		$ 8.74
Total fair value of stock options vested	$ 1,077,000	1,182,000	$ 1,015,000
Total intrinsic value of stock options exercised	$ 2,045,000	$ 2,595,000	$ 792,000
Incentive stock options granted to 10% shareholders
Stock option details
Maximum exercisable period for options granted	5 years

Long Term Restricted Stock Un_2

Long Term Restricted Stock Units (Details) - Plan - RSUs	12 Months Ended
	Dec. 31, 2018shares
Long-Term Restricted Stock Units
Granted units	0
Outstanding grants (in shares)	0

Commitments, Contingent Liabi_3

Commitments, Contingent Liabilities and Other Tax Matters (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Commitments, Contingent Liabilities and Other Tax Matters
Total rental expense	$ 5,257,000	$ 5,258,000	$ 5,870,000
Minimum period for non-cancellable sub-leases	1 year
Aggregate future minimum rentals to be received under non-cancellable sub-leases	$ 82,690,000
Approximate cash maintained to satisfy regulatory reserve requirements	115,721,000	$ 116,129,000
Future minimum lease payments due under non-cancellable operating leases
2,019	3,443,000
2,020	3,246,000
2,021	2,272,000
2,022	579,000
2,023	212,000
Thereafter	275,000
Total	$ 10,027,000

Transactions with Related Par_2

Transactions with Related Parties (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Transactions with Related Parties
Aggregate amount receivable from related parties	$ 33,042,000	$ 27,626,000

Financial Instruments with Of_3

Financial Instruments with Off-Statement of Condition Risk and Concentrations of Credit Risk (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Maximum
Financial amounts of instruments, whose contract amounts represent credit risks
Credit risk commitment, maximum expiration date	1 year
Commitments to extend credit
Financial amounts of instruments, whose contract amounts represent credit risks
Outstanding amount of financial instruments whose, contract amounts represent credit risks	$ 2,935,768,000
Credit card lines
Financial amounts of instruments, whose contract amounts represent credit risks
Outstanding amount of financial instruments whose, contract amounts represent credit risks	21,114,000
Standby letters of credit
Financial amounts of instruments, whose contract amounts represent credit risks
Outstanding amount of financial instruments whose, contract amounts represent credit risks	111,229,000
Guarantee obligations, maximum exposure	111,229,000
Commercial letters of credit
Financial amounts of instruments, whose contract amounts represent credit risks
Outstanding amount of financial instruments whose, contract amounts represent credit risks	8,073,000
Unsecured letters of credit
Financial amounts of instruments, whose contract amounts represent credit risks
Unsecured letters of credit	$ 42,729,000	$ 35,409,000

Capital Requirements (Details)

Capital Requirements (Details) - USD ($)	Sep. 19, 2018	Dec. 23, 2008	Dec. 31, 2018
Capital Requirements
Warrants to purchase entity's common stock (in shares)		1,326,238
Warrants, exercise price (in dollars per share)		$ 24.43
Warrants, term		10 years
Maximum cash dividend paid in semi-annual period (in dollars per share)	$ 0.33
Payments for repurchase of warrants	$ 29,005,000		$ 29,005,000
Dividend payable by subsidiaries, maximum			$ 768,900,000

Capital Requirements (Changes)

Capital Requirements (Changes) (Details) - USD ($) $ in Billions	Dec. 31, 2018	Jun. 30, 2018	May 24, 2018	Dec. 31, 2016	Jan. 01, 2016	Jul. 31, 2013
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent)				2.50%	0.625%
Maximum amount of assets to exempt banks			$ 10
Maximum amount of assets for qualified bank holding companies	$ 3	$ 1
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent)						6.00%
Minimum
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent)				4.50%
Community bank leverage ratio			8.00%			4.00%
CET 1 ratio	7.00%
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent)						4.00%
Maximum
Community bank leverage ratio			10.00%

Capital Requirements (Capital A

Capital Requirements (Capital Amounts and Ratios) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2016	Jul. 31, 2013
Capital Requirements
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent)			2.50%	0.625%
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent)					6.00%
Minimum
Capital Requirements
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent)			4.50%
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent)					4.00%
Parent Company
Capital Requirements
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Amount	$ 1,711,682	$ 1,584,665
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent)	17.55%	17.11%
Total Capital (to Risk Weighted Assets), Actual Amount	$ 1,925,905	$ 1,807,107
Tier 1 Capital (to Risk Weighted Assets), Actual Amount	1,859,536	1,734,595
Tier 1 Capital (to Average Assets), Actual Amount	$ 1,859,536	$ 1,734,595
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent)	19.74%	19.51%
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent)	19.06%	18.73%
Tier 1 capital (to Average Assets), Actual Ratio (as a percent)	15.87%	14.62%
Parent Company | Minimum
Capital Requirements
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount	$ 621,850	$ 532,579
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent)	6.375%	5.75%
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount	$ 963,258	$ 856,757
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount	768,168	671,512
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount	$ 468,593	$ 474,675
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent)	9.875%	9.25%
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent)	7.875%	7.25%
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Ratio (as a percent)	4.00%	4.00%
International Bank of Commerce, Laredo
Capital Requirements
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Amount	$ 1,201,462	$ 1,119,173
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent)	17.24%	17.10%
Total Capital (to Risk Weighted Assets), Actual Amount	$ 1,248,107	$ 1,173,068
Tier 1 Capital (to Risk Weighted Assets), Actual Amount	1,201,462	1,119,173
Tier 1 Capital (to Average Assets), Actual Amount	$ 1,201,462	$ 1,119,173
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent)	17.91%	17.93%
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent)	17.24%	17.10%
Tier 1 capital (to Average Assets), Actual Ratio (as a percent)	14.45%	13.44%
International Bank of Commerce, Laredo | Minimum
Capital Requirements
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount	$ 444,207	$ 376,245
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 452,917	$ 425,320
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent)	6.375%	5.75%
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	6.50%	6.50%
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount	$ 688,086	$ 605,263
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	696,796	654,339
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount	548,727	474,395
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	557,437	523,471
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount	332,507	333,166
Tier 1 Capital (to Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 415,634	$ 416,458
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent)	9.875%	9.25%
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	10.00%	10.00%
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent)	7.875%	7.25%
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	8.00%	8.00%
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Ratio (as a percent)	4.00%	4.00%
Tier 1 Capital (to Average Assets), To Be well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	5.00%	5.00%
International Bank Of Commerce Oklahoma
Capital Requirements
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Amount	$ 188,997	$ 169,279
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent)	13.95%	13.41%
Total Capital (to Risk Weighted Assets), Actual Amount	$ 198,293	$ 178,057
Tier 1 Capital (to Risk Weighted Assets), Actual Amount	188,997	169,279
Tier 1 Capital (to Average Assets), Actual Amount	$ 188,997	$ 169,279
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent)	14.64%	14.11%
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent)	13.95%	13.41%
Tier 1 capital (to Average Assets), Actual Ratio (as a percent)	12.53%	11.31%
International Bank Of Commerce Oklahoma | Minimum
Capital Requirements
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount	$ 86,344	$ 72,586
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 88,037	$ 82,054
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent)	6.375%	5.75%
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	6.50%	6.50%
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount	$ 133,749	$ 116,769
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	135,442	126,237
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount	106,660	91,521
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	108,354	100,989
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount	60,344	59,854
Tier 1 Capital (to Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 75,430	$ 74,818
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent)	9.875%	9.25%
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	10.00%	10.00%
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent)	7.875%	7.25%
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	8.00%	8.00%
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Ratio (as a percent)	4.00%	4.00%
Tier 1 Capital (to Average Assets), To Be well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	5.00%	5.00%
International Bank of Commerce, Brownsville
Capital Requirements
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Amount	$ 177,456	$ 165,034
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent)	24.73%	25.94%
Total Capital (to Risk Weighted Assets), Actual Amount	$ 183,554	$ 170,613
Tier 1 Capital (to Risk Weighted Assets), Actual Amount	177,456	165,034
Tier 1 Capital (to Average Assets), Actual Amount	$ 177,456	$ 165,034
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent)	25.58%	26.82%
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent)	24.73%	25.94%
Tier 1 capital (to Average Assets), Actual Ratio (as a percent)	17.25%	17.17%
International Bank of Commerce, Brownsville | Minimum
Capital Requirements
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount	$ 45,741	$ 36,583
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 46,638	$ 41,355
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent)	6.375%	5.75%
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	6.50%	6.50%
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount	$ 70,854	$ 58,851
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	71,750	63,623
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount	56,503	46,127
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	57,400	50,899
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount	41,144	38,440
Tier 1 Capital (to Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 51,430	$ 48,050
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent)	9.875%	9.25%
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	10.00%	10.00%
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent)	7.875%	7.25%
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	8.00%	8.00%
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Ratio (as a percent)	4.00%	4.00%
Tier 1 Capital (to Average Assets), To Be well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	5.00%	5.00%
International Bank of Commerce, Zapata
Capital Requirements
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Amount	$ 70,984	$ 66,406
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent)	30.77%	30.58%
Total Capital (to Risk Weighted Assets), Actual Amount	$ 73,726	$ 68,718
Tier 1 Capital (to Risk Weighted Assets), Actual Amount	70,984	66,406
Tier 1 Capital (to Average Assets), Actual Amount	$ 70,984	$ 66,406
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent)	31.96%	31.64%
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent)	30.77%	30.58%
Tier 1 capital (to Average Assets), Actual Ratio (as a percent)	16.22%	14.20%
International Bank of Commerce, Zapata | Minimum
Capital Requirements
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount	$ 14,707	$ 12,487
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 14,996	$ 14,116
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent)	6.375%	5.75%
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	6.50%	6.50%
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount	$ 22,782	$ 20,088
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	23,070	21,717
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount	18,168	15,745
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	18,456	17,374
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount	17,507	18,701
Tier 1 Capital (to Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 21,884	$ 23,376
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent)	9.875%	9.25%
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	10.00%	10.00%
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent)	7.875%	7.25%
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	8.00%	8.00%
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Ratio (as a percent)	4.00%	4.00%
Tier 1 Capital (to Average Assets), To Be well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	5.00%	5.00%
Commerce Bank
Capital Requirements
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Amount	$ 89,305	$ 79,330
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent)	32.95%	33.22%
Total Capital (to Risk Weighted Assets), Actual Amount	$ 90,894
Tier 1 Capital (to Risk Weighted Assets), Actual Amount	89,305	$ 81,278
Tier 1 Capital (to Average Assets), Actual Amount	$ 89,305	$ 79,330
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent)	33.54%	34.03%
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent)	32.95%	33.22%
Tier 1 capital (to Average Assets), Actual Ratio (as a percent)	15.53%	14.56%
Commerce Bank | Minimum
Capital Requirements
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount	$ 17,276	$ 13,733
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 17,615	$ 15,524
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent)	6.375%	5.75%
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	6.50%	6.50%
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount	$ 26,761	$ 22,092
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	27,100	23,884
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount	21,341	17,316
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	21,680	19,107
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount	23,000	21,789
Tier 1 Capital (to Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 28,750	$ 27,236
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent)	9.875%	9.25%
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	10.00%	10.00%
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent)	7.875%	7.25%
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	8.00%	8.00%
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Ratio (as a percent)	4.00%	4.00%
Tier 1 Capital (to Average Assets), To Be well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	5.00%	5.00%

Fair Value (Fair Value By Level

Fair Value (Fair Value By Level) (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Assets:
Available for sale debt securities	$ 3,411,350,000	$ 4,124,184,000
Equity Securities	5,937,000	27,886,000
Marketable Securities	3,418,487,000	4,154,470,000
Assets/liabilities measured at fair value | Residential mortgage-backed securities
Assets:
Available for sale debt securities	3,223,010,000	3,891,233,000
Assets/liabilities measured at fair value | Obligations of states and political subdivisions
Assets:
Available for sale debt securities	188,340,000	232,951,000
Assets/liabilities measured at fair value | Equity securities with readily determinable fair values
Assets:
Equity Securities		27,886,000
Measured on a recurring basis: | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Marketable Securities	5,937,000	27,886,000
Measured on a recurring basis: | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities with readily determinable fair values
Assets:
Equity Securities	5,937,000	27,886,000
Measured on a recurring basis: | Significant Other Observable Inputs (Level 2)
Assets:
Marketable Securities	3,411,350,000	4,124,184,000
Measured on a recurring basis: | Significant Other Observable Inputs (Level 2) | Residential mortgage-backed securities
Assets:
Available for sale debt securities	3,223,010,000	3,891,233,000
Measured on a recurring basis: | Significant Other Observable Inputs (Level 2) | Obligations of states and political subdivisions
Assets:
Available for sale debt securities	188,340,000	232,951,000
Measured on a recurring basis: | Assets/liabilities measured at fair value
Assets:
Marketable Securities	3,417,287,000	4,152,070,000
Measured on a recurring basis: | Assets/liabilities measured at fair value | Residential mortgage-backed securities
Assets:
Available for sale debt securities	3,223,010,000	3,891,233,000
Measured on a recurring basis: | Assets/liabilities measured at fair value | Obligations of states and political subdivisions
Assets:
Available for sale debt securities	188,340,000	232,951,000
Measured on a recurring basis: | Assets/liabilities measured at fair value | Equity securities with readily determinable fair values
Assets:
Equity Securities	$ 5,937,000	$ 27,886,000

Fair Value (Fair Value Measurem

Fair Value (Fair Value Measurement and Assumptions) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Assets:
Impaired Loans	$ 14,306,000	$ 53,267,000
Non-financial assets:
Other real estate owned	57,344,000	30,519,000
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	170,000	30,000	$ 381,000
Adjustment to fair value in connection with other real estate owned	3,071,000	710,000	$ 2,351,000
Impaired commercial collateral dependent loans	14,306,000	53,267,000
Impaired commercial collateral dependent receivables appraisals to determine fair value within immediately preceding twelve months	10,911,000	18,585,000
Impaired collateral dependent commercial loans with internal evaluation completed within last twelve months	0	0
Measured on a non-recurring basis
Assumptions used in discounted cash flow model to determine fair value of investments classified within level 3
Change in net provision, impaired loans	356,000	2,138,000
Change in net provision, other real estate owned	3,071,000	710,000
Measured on a non-recurring basis | Significant Unobservable Inputs (Level 3)
Assets:
Impaired Loans	1,563,000	11,210,000
Non-financial assets:
Other real estate owned	38,871,000	2,000,000
Assumptions used in discounted cash flow model to determine fair value of investments classified within level 3
Impaired commercial collateral dependent loans	1,563,000	11,210,000
Measured on a non-recurring basis | Assets/liabilities measured at fair value
Assets:
Impaired Loans	1,563,000	11,210,000
Non-financial assets:
Other real estate owned	38,871,000	2,000,000
Assumptions used in discounted cash flow model to determine fair value of investments classified within level 3
Impaired commercial collateral dependent loans	$ 1,563,000	$ 11,210,000

Fair Value Measurements (Other

Fair Value Measurements (Other Assumptions) (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Deposits
Carrying amount of time deposits	$ 1,973,468,000	$ 2,056,506,000
Significant Unobservable Inputs (Level 3)
Loans
Carrying amount of fixed rate performing loans	1,515,437,000	1,505,531,000
Estimated fair value of fixed rate performing loans	1,469,231,000	1,454,434,000
Deposits
Carrying amount of time deposits	1,973,468,000	2,056,506,000
Estimated fair value of time deposits	1,976,156,000	2,058,621,000
Securities Sold Under Repurchase Agreements
Carrying amount of long-term repurchase agreements		100,000,000
Estimated fair value of long-term repurchase agreements		99,504,000
Significant Other Observable Inputs (Level 2)
Other borrowed funds
Carrying amount of the long-term FHLB borrowings	436,690,000	250,000,000
Estimated fair value of long-term FHLB borrowings	$ 436,238,000	$ 249,728,000

International Bancshares Corp_7

International Bancshares Corporation (Parent Company Only) Financial Information Statements of Condition (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
ASSETS
Other investments	$ 337,507,000	$ 293,990,000
Other assets	190,376,000	81,529,000
Total assets	11,871,952,000	12,184,698,000
Liabilities:
Junior subordinated deferrable interest debentures	160,416,000	160,416,000
Other liabilities	139,755,000	91,380,000
Total liabilities	9,932,370,000	10,345,718,000
Shareholders' equity:
Common shares	96,104,000	96,019,000
Surplus	145,283,000	171,816,000
Retained earnings	2,064,134,000	1,891,805,000
Accumulated other comprehensive (loss) income	(54,634,000)	(28,397,000)
Total shareholders' equity before treasury stock	2,250,887,000	2,131,243,000
Less cost of shares in treasury	(311,305,000)	(292,263,000)
Total shareholders' equity	1,939,582,000	1,838,980,000	$ 1,724,667,000	$ 1,665,503,000
Total liabilities and shareholders' equity	11,871,952,000	12,184,698,000
Parent Company | Reportable Legal Entities
ASSETS
Cash	19,065,000	18,398,000
Other investments	105,377,000	92,620,000
Investment in subsidiaries	1,987,293,000	1,878,521,000
Other assets		23,120,000
Total assets	2,111,735,000	2,012,659,000
Liabilities:
Junior subordinated deferrable interest debentures	160,416,000	160,416,000
Due to IBC Trading	21,000	21,000
Other liabilities	11,716,000	13,242,000
Total liabilities	172,153,000	173,679,000
Shareholders' equity:
Common shares	96,104,000	96,019,000
Surplus	145,283,000	171,816,000
Retained earnings	2,064,134,000	1,891,805,000
Accumulated other comprehensive (loss) income	(54,634,000)	(28,397,000)
Total shareholders' equity before treasury stock	2,250,887,000	2,131,243,000
Less cost of shares in treasury	(311,305,000)	(292,263,000)
Total shareholders' equity	1,939,582,000	1,838,980,000
Total liabilities and shareholders' equity	$ 2,111,735,000	$ 2,012,659,000

International Bancshares Corp_8

International Bancshares Corporation (Parent Company Only) Financial Information Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Expenses:
Interest expense (Debentures)	$ 6,989	$ 5,392	$ 4,600
Income before federal income taxes and equity in undistributed net income of subsidiaries	272,583	221,642	197,003
Income tax expense	56,652	64,206	63,071
Net income	215,931	157,436	133,932
Parent Company | Reportable Legal Entities
Income:
Dividends from subsidiaries	105,000	64,600	84,432
Interest income on notes receivable			2
Interest income on other investments	8,208	8,100	8,958
Other	1,988	26	255
Total income	115,196	72,726	93,647
Expenses:
Interest expense (Debentures)	6,989	5,392	4,600
Other	2,930	5,648	3,637
Total expenses	9,919	11,040	8,237
Income before federal income taxes and equity in undistributed net income of subsidiaries	105,277	61,686	85,410
Income tax expense	481	(2,076)	311
Income before equity in undistributed net income of subsidiaries	104,796	63,762	85,099
Equity in undistributed net income of subsidiaries	111,135	93,674	48,833
Net income	$ 215,931	$ 157,436	$ 133,932

International Bancshares Corp_9

International Bancshares Corporation (Parent Company Only) Financial Information Statements of Cash Flows (Details) - USD ($)	Sep. 19, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating activities:
Net income		$ 215,931,000	$ 157,436,000	$ 133,932,000
Adjustments to reconcile net income to net cash provided by operating activities:
Investment securities transactions, net		141,000	4,774,000	2,626,000
Unrealized loss on equity securities with readily determinable fair values		388,000
Impairment charges on available for sale securities				354,000
Stock compensation expense		1,035,000	903,000	1,082,000
(Decrease) increase in other liabilities		24,916,000	592,000	(7,705,000)
Net cash provided by operating activities		229,847,000	196,819,000	203,220,000
Investing activities:
Principal collected on mortgage-backed securities		675,304,000	780,097,000	919,594,000
Net cash provided by (used in) investing activities		379,440,000	(403,807,000)	(137,763,000)
Financing activities:
Redemption of long-term debt				(1,000,000)
Proceeds from stock transactions		1,522,000	1,455,000	549,000
Payments of cash dividends - common		(49,599,000)	(43,594,000)	(39,569,000)
Repurchase of outstanding common stock warrant	$ (29,005,000)	(29,005,000)
Purchase of treasury stock		(19,042,000)	(187,000)	(7,966,000)
Net cash (used in) provided by financing activities		(557,847,000)	203,147,000	(69,312,000)
Increase (decrease) in cash and cash equivalents		51,440,000	(3,841,000)	(3,855,000)
Cash and cash equivalents at beginning of period		265,357,000	269,198,000	273,053,000
Cash and cash equivalents at end of period		316,797,000	265,357,000	269,198,000
Parent Company | Reportable Legal Entities
Operating activities:
Net income		215,931,000	157,436,000	133,932,000
Adjustments to reconcile net income to net cash provided by operating activities:
Investment securities transactions, net			(23,000)
Unrealized loss on equity securities with readily determinable fair values		330,000
Impairment charges on available for sale securities				112,000
Stock compensation expense		1,035,000	903,000	1,082,000
(Decrease) increase in other liabilities		(1,479,000)	(3,453,000)	3,901,000
Equity in undistributed net income of subsidiaries		(111,135,000)	(93,674,000)	(48,833,000)
Net cash provided by operating activities		104,682,000	61,189,000	90,194,000
Investing activities:
Principal collected on mortgage-backed securities			6,328,000	1,105,000
Net decrease in notes receivable				99,000
Increase in other assets and other investments		(7,891,000)	(25,348,000)	(27,834,000)
Net cash provided by (used in) investing activities		(7,891,000)	(19,020,000)	(26,630,000)
Financing activities:
Redemption of long-term debt				(1,000,000)
Proceeds from stock transactions		1,522,000	1,455,000	549,000
Payments of cash dividends - common		(49,599,000)	(43,594,000)	(39,569,000)
Repurchase of outstanding common stock warrant		(29,005,000)
Purchase of treasury stock		(19,042,000)	(187,000)	(7,966,000)
Net cash (used in) provided by financing activities		(96,124,000)	(42,326,000)	(47,986,000)
Increase (decrease) in cash and cash equivalents		667,000	(157,000)	15,578,000
Cash and cash equivalents at beginning of period		18,398,000	18,555,000	2,977,000
Cash and cash equivalents at end of period		$ 19,065,000	$ 18,398,000	$ 18,555,000