International Bancshares (IBOC) 10-Q 7 Nov 18 2018 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Nov. 05, 2018
Document and Entity Information
Entity Registrant Name	INTERNATIONAL BANCSHARES CORP
Entity Central Index Key	315,709
Document Type	10-Q
Document Period End Date	Sep. 30, 2018
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		66,155,136
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q3
Entity Small Business	false
Entity Emerging Growth Company	false

Consolidated Statements of Cond

Consolidated Statements of Condition - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Assets
Cash and cash equivalents	$ 285,664,000	$ 265,357,000
Investment securities:
Held to maturity debt securities (Fair value of $2,400 on September 30, 2018 and $2,400 on December 31, 2017)	2,400,000	2,400,000
Available for sale debt securities (Amortized cost of $3,631,419 on September 30, 2018 and $4,196,263 on December 31, 2017)	3,509,896,000	4,124,185,000
Equity securities with readily determinable fair values	6,013,000	27,885,000
Total investment securities	3,518,309,000	4,154,470,000
Loans	6,475,141,000	6,348,172,000
Less allowance for probable loan losses	(60,654,000)	(67,687,000)
Net loans	6,414,487,000	6,280,485,000
Bank premises and equipment, net	510,493,000	514,454,000
Accrued interest receivable	34,391,000	34,456,000
Other investments	609,997,000	571,415,000
Goodwill	282,532,000	282,532,000
Other assets	189,628,000	81,529,000
Total assets	11,845,501,000	12,184,698,000
Deposits:
Demand - non-interest bearing	3,431,773,000	3,243,255,000
Savings and interest bearing demand	3,231,193,000	3,245,131,000
Time	1,982,635,000	2,056,506,000
Total deposits	8,645,601,000	8,544,892,000
Securities sold under repurchase agreements	333,803,000	353,805,000
Other borrowed funds	674,900,000	1,195,225,000
Junior subordinated deferrable interest debentures	160,416,000	160,416,000
Other liabilities	171,936,000	91,380,000
Total liabilities	9,986,656,000	10,345,718,000
Shareholders' equity:
Common shares of $1.00 par value. Authorized 275,000,000 shares; issued 96,083,354 shares on September 30, 2018 and 96,019,028 shares on December 31, 2017	96,083,000	96,019,000
Surplus	144,660,000	171,816,000
Retained earnings	2,005,606,000	1,891,805,000
Accumulated other comprehensive loss	(95,184,000)	(28,397,000)
Total shareholders' equity before treasury stock	2,151,165,000	2,131,243,000
Less cost of shares in treasury, 29,940,843 shares on September 30, 2018 and 29,939,545 on December 31, 2017	(292,320,000)	(292,263,000)
Total shareholders' equity	1,858,845,000	1,838,980,000
Total liabilities and shareholders' equity	$ 11,845,501,000	$ 12,184,698,000

Consolidated Statements of Co_2

Consolidated Statements of Condition (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Consolidated Statements of Condition
Held to maturity, Fair value (in dollars)	$ 2,400	$ 2,400
Available for sale, Amortized cost (in dollars)	$ 3,631,419	$ 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	96,083,354	96,019,028
Treasury, shares	29,940,843	29,939,545

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Interest income:
Loans, including fees	$ 95,828	$ 83,394	$ 275,744	$ 238,261
Investment securities:
Taxable	20,213	21,003	62,121	60,998
Tax-exempt	1,981	2,409	6,263	7,357
Other interest income	352	139	719	484
Total interest income	118,374	106,945	344,847	307,100
Interest expense:
Savings deposits	3,353	1,599	8,872	4,241
Time deposits	3,493	2,426	9,172	7,203
Securities sold under repurchase agreements	468	1,177	1,839	5,391
Other borrowings	4,358	3,396	13,426	7,234
Junior subordinated deferrable interest debentures	1,828	1,395	5,119	3,967
Total interest expense	13,500	9,993	38,428	28,036
Net interest income	104,874	96,952	306,419	279,064
Provision for probable loan losses	4,280	6,591	3,212	9,096
Net interest income after provision for probable loan losses	100,594	90,361	303,207	269,968
Non-interest income:
Investment securities transactions, net	(141)		(141)	(1,612)
Other investments, net	5,625	4,938	16,192	12,036
Other income	3,643	2,774	13,425	8,569
Total non-interest income	42,503	41,366	123,781	113,044
Non-interest expense:
Employee compensation and benefits	35,360	33,787	104,670	99,256
Occupancy	6,839	6,416	20,077	18,824
Depreciation of bank premises and equipment	6,460	6,407	19,097	18,936
Professional fees	4,063	3,577	10,010	11,143
Deposit insurance assessments	928	1,007	2,902	2,310
Net expense, other real estate owned	911	(407)	3,289	989
Amortization of identified intangible assets				25
Advertising	2,020	2,064	5,667	6,448
Early termination fee - securities sold under repurchase agreements				5,765
Software and software maintenance	4,481	4,302	12,943	12,155
Other	17,005	14,558	48,922	45,199
Total non-interest expense	78,067	71,711	227,577	221,050
Income before income taxes	65,030	60,016	199,411	161,962
Provision for income taxes	13,935	20,388	42,009	49,761
Net income	$ 51,095	$ 39,628	$ 157,402	$ 112,201
Basic earnings per common share:
Weighted average number of shares outstanding (in shares)	66,136,091	66,060,829	66,114,482	66,036,501
Net income (in dollars per share)	$ 0.77	$ 0.60	$ 2.38	$ 1.70
Fully diluted earnings per common share:
Weighted average number of shares outstanding (in shares)	66,423,209	66,745,350	66,739,899	66,736,250
Net income (in dollars per share)	$ 0.77	$ 0.59	$ 2.36	$ 1.68
Services charges on deposit accounts
Non-interest income:
Service charges	$ 18,391	$ 18,706	$ 53,658	$ 54,494
Other service charges, commissions and fees, Banking
Non-interest income:
Service charges	13,100	13,095	35,374	34,505
Other service charges, commissions and fees, Non-banking
Non-interest income:
Service charges	$ 1,885	$ 1,853	$ 5,273	$ 5,052

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Consolidated Statements of Comprehensive Income
Net income	$ 51,095	$ 39,628	$ 157,402	$ 112,201
Other comprehensive income, net of tax:
Net unrealized holding (losses) gains on securities available for sale arising during period (net of tax effects of $(4,193), $198, $(17,787) and $10,290)	(15,772)	368	(66,912)	19,110
Reclassification adjustment for losses on securities available for sale included in net income (net of tax effects of $30, $0, $30 and $564)	111		111	1,048
Other comprehensive income, net of tax	(15,661)	368	(66,801)	20,158
Comprehensive income	$ 35,434	$ 39,996	$ 90,601	$ 132,359

Consolidated Statements of Co_3

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Consolidated Statements of Comprehensive Income
Net unrealized holding (losses) gains on securities available for sale arising during period, tax effects	$ (4,193)	$ 198	$ (17,787)	$ 10,290
Reclassification adjustment for (losses) gains on securities available for sale included in net income, tax effects	$ 30	$ 0	$ 30	$ 564

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($)	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Operating activities:
Net income	$ 157,402,000	$ 112,201,000
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for probable loan losses	3,212,000	9,096,000
Specific reserve, other real estate owned	3,033,000	330,000
Depreciation of bank premises and equipment	19,097,000	18,936,000
Gain on sale of bank premises and equipment	(293,000)	(30,000)
Gain on sale of other real estate owned	(1,317,000)	(267,000)
Accretion of investment securities discounts	(209,000)	(307,000)
Amortization of investment securities premiums	15,620,000	18,068,000
Investment securities transactions, net	141,000	1,612,000
Unrealized loss on equity securities with readily determinable fair values	312,000
Amortization of identified intangible assets		25,000
Stock based compensation expense	755,000	699,000
Earnings from affiliates and other investments	(12,247,000)	(9,538,000)
Deferred tax expense (benefit)	1,373,000	(26,000)
Decrease (increase) in accrued interest receivable	65,000	(106,000)
(Increase) decrease in other assets	(48,747,000)	6,516,000
Net increase in other liabilities	40,533,000	17,314,000
Net cash provided by operating activities	178,730,000	174,523,000
Investing activities:
Proceeds from maturities of securities	1,075,000
Proceeds from sales and calls of available for sale securities	37,675,000	279,419,000
Proceeds from sales of equity securities with readily determinable fair values	21,607,000
Purchases of available for sale securities	(47,346,000)	(944,241,000)
Principal collected on mortgage backed securities	529,956,000	573,713,000
Net increase in loans	(168,823,000)	(245,019,000)
Purchases of other investments	(34,914,000)	(10,282,000)
Distributions from other investments	2,894,000	349,000
Purchases of bank premises and equipment	(16,256,000)	(10,303,000)
Proceeds from sales of other real estate owned	1,413,000	2,194,000
Proceeds from sales of bank premises and equipment	3,633,000	11,139,000
Net cash provided by (used in) investing activities	330,914,000	(343,031,000)
Financing activities:
Net increase in non-interest bearing demand deposits	188,518,000	86,778,000
Net (decrease) increase in savings and interest bearing demand deposits	(13,938,000)	49,654,000
Net decrease in time deposits	(73,871,000)	(132,980,000)
Net decrease in securities sold under repurchase agreements	(20,002,000)	(126,952,000)
Net (decrease) increase in other borrowed funds	(520,325,000)	334,125,000
Repurchase of outstanding common stock warrant	(29,005,000)
Purchase of treasury stock	(57,000)	(132,000)
Proceeds from stock transactions	1,158,000	1,185,000
Payments of cash dividends - common	(21,815,000)	(21,793,000)
Net cash (used in) provided by financing activities	(489,337,000)	189,885,000
Increase in cash and cash equivalents	20,307,000	21,377,000
Cash and cash equivalents at beginning of period	265,357,000	269,198,000
Cash and cash equivalents at end of period	285,664,000	290,575,000
Supplemental cash flow information:
Interest paid	37,051,000	9,735,000
Income taxes paid	39,715,000	54,442,000
Non-cash investing and financing activities:
Net transfers from loans to other real estate owned	31,609,000	1,538,000
Dividends declared, not yet paid on common stock	$ 27,784,000	$ 21,801,000

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2018
Basis of Presentation
Basis of Presentation	Note 1 — Basis of Presentation The accounting and reporting policies of International Bancshares Corporation (the “Corporation”) and Subsidiaries (the Corporation and Subsidiaries collectively referred to herein as the “Company”) conform to accounting principles generally accepted in the United States of America and to general practices within the banking industry. The consolidated financial statements include the accounts of the Corporation and its wholly-owned subsidiaries, International Bank of Commerce, Laredo (“IBC”), Commerce Bank, International Bank of Commerce, Zapata, International Bank of Commerce, Brownsville, International Bank of Commerce, Oklahoma and the Corporation’s 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. The consolidated financial statements are unaudited, but include all adjustments, which, in the opinion of management, are necessary for a fair presentation of the results of the periods presented. All such adjustments were of a normal and recurring nature. These financial statements should be read in conjunction with the financial statements and the notes thereto in the Company’s latest Annual Report on Form 10-K. The consolidated statement of condition at December 31, 2017 has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by accounting principles generally accepted in the United States of America (“US GAAP”) for complete financial statements. Certain reclassifications have been made to make prior periods comparable. Operating results for the three and nine months ended September 30, 2018 are not necessarily indicative of the results for the year ending December 31, 2018 or any future period. The Company operates as one segment. The operating information used by the Company’s chief executive officer for purposes of assessing performance and making operating decisions about the Company is the consolidated statements presented in this report. The Company has five active operating subsidiaries, the bank subsidiaries. The Company applies the provisions of Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”), FASB ASC 280, “Segment Reporting,” in determining its reportable segments and related disclosures. The Company has evaluated all events or transactions that occurred through the date the Company issued these financial statements. During this period, the Company did not have any material recognizable or non-recognizable subsequent events. On January 1, 2018, the Company adopted the provisions of ASU 2016-01, “Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities,” and ASU 2018-03, “Technical Corrections and Improvements to Financial Instruments – Overall,” which affects current US GAAP as it relates to the accounting for equity investments, financial liability under the fair value option, and the presentation and disclosure requirements for financial instruments. ASU 2016-01 also supersedes the guidance that requires: (i) the classification of equity securities with readily determinable fair values into different categories, and (ii) recognition in changes in fair value of available-for-sale securities in other comprehensive income. 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 the Company’s 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 the Company’s 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 the Company’s consolidated financial statements. On January 1, 2018, the Company adopted the provisions of ASU 2014-09 to ASC 606, “Revenue from Contracts with Customers.” ASC 606 sets a common standard that defines revenue and the principles for recognizing revenue. The core principle of the accounting standards update requires an entity to recognize revenue in a manner that reflects the consideration that an entity is expected to receive in exchange for goods or services as performance obligations are satisfied. The Company’s revenue is primarily comprised of net interest income on financial assets and financial liabilities, which is explicitly excluded from the scope of ASC 606. The Company has 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 the Company’s consolidated financial statements or operations. The Company adopted the provisions of ASU 2018-02 to ASC 220, “Income Statement- Reporting Comprehensive Income” in the second quarter of 2018. ASU 2018-02 amends current guidance surrounding the reclassification of certain tax effects from accumulated other comprehensive income (loss) as a result of the 2017 Tax Cuts and Jobs Act and the related impact to comprehensive income (loss) as a result of the application of existing guidance with respect to changes in tax rates. Under prior guidance, entities were to 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 would be recognized through earnings and would result in stranded tax effects in other comprehensive income (loss) for the impact of the rate change. ASU 2018-02 allows for 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 Company recorded a one-time reclassification of $5,979,000 between accumulated comprehensive income (loss) and retained earnings as a result of the adoption of the accounting standards update.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2018
Fair Value Measurements
Fair Value Measurements	Note 2 — Fair Value Measurements ASC Topic 820, “Fair Value Measurements and Disclosures” (“ASC 820”), defines fair value, establishes a framework for measuring fair value in generally accepted accounting principles, and expands disclosures about fair value measurements. ASC 820 applies to all financial instruments that are being measured and reported on a fair value basis. ASC 820 defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date; it also establishes a fair value hierarchy that prioritizes the inputs used in valuation methodologies into the following three levels: · Level 1 Inputs - Unadjusted quoted prices in active markets for identical assets or liabilities. · Level 2 Inputs - Observable inputs other than Level 1 inputs, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. · Level 3 Inputs - Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Level 3 assets and liabilities include financial instruments whose value is determined using pricing models, discounted cash flow methodologies, or other valuation techniques, as well as instruments for which the determination of fair value requires significant management judgment or estimation. 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 assets and liabilities reported on the consolidated balance sheets at their fair value on a recurring basis as of September 30, 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 September 30, 2018 (Level 1) (Level 2) (Level 3) Measured on a recurring basis: Assets: Available for sale debt securities Residential mortgage-backed securities $ 3,320,727 $ — $ 3,320,727 $ — States and political subdivisions 189,169 — 189,169 — Equity Securities 6,013 6,013 — — $ 3,515,909 $ 6,013 $ 3,509,896 $ — The following table represents assets and liabilities reported on the consolidated balance sheets at their fair value on a recurring basis as of December 31, 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 27,886 27,886 — — $ 4,152,070 $ 27,886 $ 4,124,184 $ — Available-for-sale debt securities are classified within Level 2 of the valuation hierarchy. Equity securities with readily determinable fair values are classified within Level 1. For debt investments classified as Level 2 in the fair value hierarchy, the Company obtains fair value measurements from an independent pricing service. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the bond’s terms and conditions, among other things. Certain financial assets and financial liabilities are measured at fair value on a non-recurring basis. The instruments are not measured at fair value on an ongoing basis but are subject to fair value adjustments in certain circumstances (for example, when there is evidence of impairment). The following table represents financial instruments measured at fair value on a non-recurring basis as of and for the period ended September 30, 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) September 30, Assets Inputs Inputs During 2018 (Level 1) (Level 2) (Level 3) Period Measured on a non-recurring basis: Assets: Impaired loans $ 8,665 $ — $ — $ 8,665 $ 716 Other real estate owned 8,886 — — 8,886 3,033 The following table represents financial instruments measured at fair value on a non-recurring basis as of and for the period 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 The Company’s 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. As the primary sources of loan repayments decline, the secondary repayment source, the collateral, takes on greater significance. Correctly evaluating the fair value becomes even more important. Re-measurement of the 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 the Company’s appraisal and appraisal review process is based on regulatory guidelines and strives to comply with all regulatory appraisal laws, regulations, and the Uniform Standards of Professional Appraisal Practice. All appraisals and evaluations are “as is” (the property’s highest and best use) valuations based on the current conditions of the property/project at that point in time. The determination of the fair value of the collateral is based on the net realizable value, which is the appraised value less any closing costs, when applicable. As of September 30, 2018, the Company had $22,948,000 of impaired commercial collateral dependent loans, of which $16,083,000 had an appraisal performed within the immediately preceding twelve months, and of which $0 had an evaluation performed within the immediately preceding twelve months. As of December 31, 2017, the Company had $53,267,000 of impaired commercial collateral dependent loans, of which $18,585,000 had an appraisal performed within the immediately preceding twelve months and of which $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 the Company 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, the Company 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 three and nine months ended September 30, 2018 and the twelve months ended December 31, 2017, the Company recorded $8,000, $170,000 and $30,000, respectively, in charges to the allowance for probable loan losses in connection with loans transferred to other real estate owned. For the three and nine months ended September 30, 2018 and the twelve months ended December 31, 2017, the Company recorded $635,000, $3,033,000 and $710,000, respectively, in adjustments to fair value in connection with other real estate owned. The fair value estimates, methods, and assumptions for the Company’s financial instruments at September 30, 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. Time Deposits with Banks The carrying amounts of time deposits with banks approximate fair value. Investment Securities Held-to-Maturity The carrying amounts of investments held-to-maturity approximate fair value. Investment Securities For investment securities, which include U.S. Treasury securities, obligations of other U.S. government agencies, obligations of states and political subdivisions and mortgage pass-through and related securities, fair values are from an independent pricing service. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the bond’s terms and conditions, among other things. See disclosures of fair value of investment securities in Note 6. Loans Fair values are estimated for portfolios of loans with similar financial characteristics. Loans are segregated by type, such as commercial, real estate and consumer loans, as outlined by regulatory reporting guidelines. Each category is segmented into fixed and variable interest rate terms and by performing and non-performing categories. For variable rate performing loans, the carrying amount approximates the fair value. For fixed-rate performing loans, except residential mortgage loans, the fair value is calculated by discounting scheduled cash flows through the estimated maturity using estimated market discount rates that reflect the credit and interest rate risk inherent in the loan. For performing residential mortgage loans, fair value is estimated by discounting contractual cash flows adjusted for prepayment estimates using discount rates based on secondary market sources or the primary origination market. Fixed-rate performing loans are within Level 3 of the fair value hierarchy. At September 30, 2018, and December 31, 2017, the carrying amount of fixed-rate performing loans was $1,543,620,000 and $1,505,531,000, respectively, and the estimated fair value was $1,485,318,000 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 September 30, 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 September 30, 2018 and December 31, 2017, the carrying amount of time deposits was $1,982,635,000 and $2,056,506,000, respectively, and the estimated fair value was $1,984,627,000 and $2,058,621,000, respectively. Securities Sold Under Repurchase Agreements Securities sold under repurchase agreements include short- and long-term maturities. Due to the contractual terms of the short-term instruments, the carrying amounts approximated fair value at September 30, 2018 and December 31, 2017. The fair value of the long-term instruments is based on established market spreads 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 The Company currently has floating-rate junior subordinated deferrable interest debentures outstanding. Due to the contractual terms of the floating-rate junior subordinated deferrable interest debentures, the carrying amounts approximated fair value at September 30, 2018 and December 31, 2017. Other Borrowed Funds The Company currently has 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 September 30, 2018 and December 31, 2017. The long-term borrowings outstanding at September 30, 2018 are fixed-rate borrowings and the fair value is based on established market spreads for similar types of borrowings. The fixed rate long-term borrowings are included in Level 2 of the fair value hierarchy. At September 30, 2018 and December 31, 2017, the carrying amount of the fixed rate long-term FHLB borrowings was $425,000,000 and $250,000,000, respectively, and the estimated fair value was $423,568,000 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 the Company’s entire holdings of a particular financial instrument. Because no market exists for a significant portion of the Company’s financial instruments, fair value estimates are based on judgments regarding future expected loss experience, current economic conditions, risk characteristics of various financial instruments and other factors. These estimates are subjective in nature and involve uncertainties and matters of significant judgment and therefore cannot be determined with precision. Changes in assumptions could significantly affect the estimates. Fair value estimates are based on existing on- and off-statement of condition financial instruments without attempting to estimate the value of anticipated future business and the value of assets and liabilities that are not considered financial instruments. Other significant assets and liabilities that are not considered financial assets or liabilities include the bank premises and equipment and core deposit value. In addition, the tax ramifications related to the effect of fair value estimates have not been considered in the above estimates.

Loans

Loans	9 Months Ended
	Sep. 30, 2018
Loans
Loans	Note 3 — Loans A summary of loans, by loan type at September 30, 2018 and December 31, 2017 is as follows: September 30, December 31, 2018 2017 (Dollars in Thousands) Commercial, financial and agricultural $ 3,247,464 $ 3,322,668 Real estate - mortgage 1,147,632 1,133,525 Real estate - construction 1,878,440 1,683,550 Consumer 46,646 49,543 Foreign 154,959 158,886 Total loans $ 6,475,141 $ 6,348,172

Allowance for Probable Loan Los

Allowance for Probable Loan Losses	9 Months Ended
	Sep. 30, 2018
Allowance for Probable Loan Losses
Allowance for Probable Loan Losses	Note 4 — Allowance for Probable Loan Losses The allowance for probable loan losses primarily consists of the aggregate loan loss allowances of the bank subsidiaries. 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 bank subsidiary 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 the Company’s 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. All segments of the loan portfolio continue to be impacted by economic uncertainty as the economy recovers from the recent prolonged downturn. The Company’s management continually reviews the allowance for loan losses of the bank subsidiaries 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 the Company’s allowance for loan losses. Should any of the factors considered by management in evaluating the adequacy of the allowance for probable loan losses change, the Company’s 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 reasonably available, the adequacy of the allowance is dependent on a variety of factors beyond the Company’s 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 the Company’s internal classified report. Additionally, the Company’s credit department reviews the majority of the Company’s 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, the Company determines 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. A summary of the transactions in the allowance for probable loan losses by loan class is as follows: Three Months Ended September 30, 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 June 30, $ 16,596 $ 14,703 $ 18,296 $ 1,574 $ 3,591 $ 6,793 $ 450 $ 850 $ 62,853 Losses charged to allowance (6,798) — — — (74) (133) (80) (3) (7,088) Recoveries credited to allowance 489 4 19 — 23 53 12 9 609 Net (losses) recoveries charged to allowance (6,309) 4 19 — (51) (80) (68) 6 (6,479) Provision charged to operations 3,039 397 1,050 (138) (354) 194 57 35 4,280 Balance at September 30, $ 13,326 $ 15,104 $ 19,365 $ 1,436 $ 3,186 $ 6,907 $ 439 $ 891 $ 60,654 Three Months Ended September 30, 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 June 30, $ 25,140 $ 13,249 $ 17,472 $ 997 $ 2,314 $ 4,357 $ 488 $ 902 $ 64,919 Losses charged to allowance (4,249) (213) — — (16) (202) (63) — (4,743) Recoveries credited to allowance 631 17 341 — — 85 6 5 1,085 Net (losses) recoveries charged to allowance (3,618) (196) 341 — (16) (117) (57) 5 (3,658) Provision charged to operations 5,473 (1,168) 371 — 817 995 82 21 6,591 Balance at September 30, $ 26,995 $ 11,885 $ 18,184 $ 997 $ 3,115 $ 5,235 $ 513 $ 928 $ 67,852 Nine Months Ended September 30, 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 charged to allowance (11,798) (1) (70) — (118) (172) (262) (3) (12,424) Recoveries credited to allowance 1,520 8 229 — 25 348 39 10 2,179 Net (losses) recoveries charged to allowance (10,278) 7 159 — (93) 176 (223) 7 (10,245) Provision charged to operations (4,301) 3,422 2,543 327 329 628 222 42 3,212 Balance at September 30, $ 13,326 $ 15,104 $ 19,365 $ 1,436 $ 3,186 $ 6,907 $ 439 $ 891 $ 60,654 Nine Months Ended September 30, 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 charged to allowance (9,248) (213) (40) — (77) (340) (223) — (10,141) Recoveries credited to allowance 3,484 20 488 — 7 182 35 20 4,236 Net (losses) recoveries charged to allowance (5,764) (193) 448 — (70) (158) (188) 20 (5,905) Provision charged to operations 7,110 (1,811) 1,005 191 730 1,677 170 24 9,096 Balance at September 30, $ 26,995 $ 11,885 $ 18,184 $ 997 $ 3,115 $ 5,235 $ 513 $ 928 $ 67,852 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 individually or collectively. The decreases in provision for probable loan losses charged to expense for the three and nine months ended September 30, 2018 and September 30, 2017 can be attributed to a decrease in the historical loss experience in the commercial category of the calculation and a decrease in loans classified as Watch-List Substandard and Impaired. As discussed in prior periods, charge-offs increased from historical levels due to the deterioration of one relationship that is secured by multiple pieces of transportation equipment beginning in the fourth quarter of 2014. The Company uses 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 table below provides additional information on the balance of loans individually or collectively evaluated for impairment and their related allowance, by loan class as of September 30, 2018 and December 31, 2017: September 30, 2018 Loans Individually Loans Collectively Evaluated For Evaluated For Impairment Impairment Recorded Recorded Investment Allowance Investment Allowance (Dollars in Thousands) Domestic Commercial $ 17,236 $ 584 $ 1,061,329 $ 12,742 Commercial real estate: other construction & land development 2,130 116 1,876,310 14,988 Commercial real estate: farmland & commercial 4,157 — 1,977,397 19,365 Commercial real estate: multifamily 586 — 186,759 1,436 Residential: first lien 6,173 — 420,373 3,186 Residential: junior lien 740 — 720,346 6,907 Consumer 1,164 — 45,482 439 Foreign 306 — 154,653 891 Total $ 32,492 $ 700 $ 6,442,649 $ 59,954 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 table below provides additional information on loans accounted for on a non-accrual basis by loan class at September 30, 2018 and December 31, 2017: September 30, 2018 December 31, 2017 (Dollars in Thousands) Domestic Commercial $ 17,199 $ 17,909 Commercial real estate: other construction & land development 2,130 2,455 Commercial real estate: farmland & commercial 4,157 33,123 Commercial real estate: multifamily 586 476 Residential: first lien 197 712 Residential: junior lien — 11 Consumer 31 44 Total non-accrual loans $ 24,300 $ 54,730 The decrease in impaired and non-accrual loans at September 30, 2018 compared to December 31, 2017 can be attributed to a relationship secured by a waterpark foreclosed upon in the second quarter of 2018. The relationship was classified as Watch-List Impaired at December 31, 2017. 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. The Company has identified these loans through its 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 the Company’s impaired loans are measured at the fair value of the collateral. In limited cases, the Company 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 the Company’s impaired loans by loan class at September 30, 2018 and December 31, 2017: September 30, 2018 Quarter to Date Year to Date Unpaid Average Average Recorded Principal Related Recorded Interest Recorded Interest Investment Balance Allowance Investment Recognized Investment Recognized (Dollars in Thousands) Loans with Related Allowance Domestic Commercial $ 1,619 $ 2,212 $ 584 $ 1,620 $ — $ 1,794 $ — Commercial real estate: other construction & land development 138 169 116 139 — 142 — Total impaired loans with related allowance $ 1,757 $ 2,381 $ 700 $ 1,759 $ — $ 1,936 $ — September 30, 2018 Quarter to Date Year to Date Unpaid Average Average Recorded Principal Recorded Interest Recorded Interest Investment Balance Investment Recognized Investment Recognized (Dollars in Thousands) Loans with No Related Allowance Domestic Commercial $ 15,617 $ 43,068 $ 15,758 $ — $ 16,464 $ 2 Commercial real estate: other construction & land development 1,992 2,199 1,994 — 2,203 — Commercial real estate: farmland & commercial 4,157 4,660 5,986 — 36,633 — Commercial real estate: multifamily 586 617 590 — 575 — Residential: first lien 6,173 6,257 6,362 76 6,929 228 Residential: junior lien 740 748 743 11 807 33 Consumer 1,164 1,167 1,187 1 1,192 2 Foreign 306 306 318 4 331 11 Total impaired loans with no related allowance $ 30,735 $ 59,022 $ 32,938 $ 92 $ 65,134 $ 276 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 $ 19,354 $ 3 Commercial real estate: other construction & land development 2,310 2,455 2,336 67 Commercial real estate: farmland & commercial 32,675 33,275 8,523 110 Commercial real estate: multifamily 476 505 401 — Residential: first lien 6,852 6,968 6,860 298 Residential: junior lien 723 736 1,011 52 Consumer 1,281 1,283 1,214 1 Foreign 347 347 751 16 Total impaired loans with no related allowance $ 61,310 $ 89,664 $ 40,450 $ 547 The following table details key information regarding the Company’s impaired loans by loan class at September 30, 2017: September 30, 2017 Quarter to Date Year to Date Average Average Recorded Interest Recorded Interest Investment Recognized Investment Recognized (Dollars in Thousands) Loans with Related Allowance Domestic Commercial $ 2,215 $ — $ 2,439 $ — Commercial real estate: other construction & land development 149 — 151 — Commercial real estate: farmland & commercial 500 — 496 — Total impaired loans with related allowance $ 2,864 $ — $ 3,086 $ — September 30, 2017 Quarter to Date Year to Date Average Average Recorded Interest Recorded Interest Investment Recognized Investment Recognized (Dollars in Thousands) Loans with No Related Allowance Domestic Commercial $ 18,547 $ 1 $ 18,931 $ 2 Commercial real estate: other construction & land development 2,296 — 3,456 — Commercial real estate: farmland & commercial 7,936 21 9,456 79 Commercial real estate: multifamily 502 — 521 — Residential: first lien 6,733 81 6,903 241 Residential: junior lien 765 11 975 35 Consumer 1,317 2 1,278 2 Foreign 759 4 753 12 Total impaired loans with no related allowance $ 38,855 $ 120 $ 42,273 $ 371 A portion of the impaired loans have adequate collateral and credit enhancements not requiring a related allowance for loan loss. Management recognizes the risks associated with these impaired loans, however, management is confident the Company’s loss exposure regarding these credits will be significantly reduced due to the Company’s long-standing practices that 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. Management’s decision to place loans in this category does not necessarily mean that the Company will experience significant losses from these loans or significant increases in impaired loans from these levels. 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. September 30, 2018 December 31, 2017 (Dollars in Thousands) Domestic Commercial $ 6,440 $ 6,910 Commercial real estate: farmland & commercial — — Residential: first lien 5,976 6,140 Residential: junior lien 740 712 Consumer 1,134 1,237 Foreign 306 347 Total troubled debt restructuring $ 14,596 $ 15,346 The bank subsidiaries 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 of the Company believes that it is generally able to identify borrowers with financial problems reasonably early and to monitor credit extended to such borrowers carefully, there is no precise method of predicting loan losses. The determination that a loan is likely to be uncollectible and that it should be wholly or partially charged-off as a loss is an exercise of judgment. Similarly, the determination of the adequacy of the allowance for probable loan losses can be made only on a subjective basis. It is the judgment of the Company’s management that the allowance for probable loan losses at September 30, 2018 was adequate to absorb probable losses from loans in the portfolio at that date. The following tables present information regarding the aging of past due loans by loan class at September 30, 2018 and December 31, 2017: September 30, 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 $ 14,468 $ 1,381 $ 17,410 $ 886 $ 33,259 $ 1,045,306 $ 1,078,565 Commercial real estate: other construction & land development 2,596 81 1,005 100 3,682 1,874,758 1,878,440 Commercial real estate: farmland & commercial 27,621 733 3,655 789 32,009 1,949,545 1,981,554 Commercial real estate: multifamily 282 — 586 — 868 186,477 187,345 Residential: first lien 4,029 709 3,538 3,435 8,276 418,270 426,546 Residential: junior lien 746 287 1,120 1,120 2,153 718,933 721,086 Consumer 410 64 52 38 526 46,120 46,646 Foreign 1,238 1,137 1,081 1,081 3,456 151,503 154,959 Total past due loans $ 51,390 $ 4,392 $ 28,447 $ 7,449 $ 84,229 $ 6,390,912 $ 6,475,141 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 30 – 59 days Commercial real estate: farmland and commercial category at September 30, 2018 compared to December 31, 2017 can be attributed to one relationship secured by commercial real estate leased by car dealerships. The decrease in the 90 days or greater Commercial real estate: farmland and commercial category at September 30, 2018 compared to December 31, 2017 can be attributed to the removal of a loan relationship primarily secured by a water park due to the foreclosure of the collateral in the second quarter of 2018. The Company’s internal classified report is segregated into the following categories: (i) “Special Review Credits,” (ii) “Watch List-Pass Credits,” and (iii) “Watch List-Substandard Credits.” The loans placed in the “Special Review Credits” category reflect management’s opinion that the loans reflect potential weakness which requires monitoring on a more frequent basis. The “Special Review Credits” are reviewed and discussed on a regular basis with the credit department and the lending staff to determine if a change in category is warranted. The loans placed in the “Watch List-Pass Credits” category reflect the Company’s opinion that the credit contains weaknesses which represent a greater degree of risk, which warrant “extra attention.” The “Watch List-Pass Credits” are reviewed and discussed on a regular basis with the credit department and the lending staff to determine if a change in category is warranted. The loans placed in the “Watch List-Substandard Credits” classification are considered to be potentially inadequately protected by the current sound worth and debt service capacity of the borrower or of any pledged collateral. These credit obligations, even if apparently protected by collateral value, have shown defined weaknesses related to adverse financial, managerial, economic, market or political conditions which may jeopardize repayment of principal and interest. Furthermore, there is the possibility that some future loss could be sustained by the Company if such weaknesses are not corrected. For loans that are classified as impaired, management evaluates these credits in accordance with the provisions of ASC 310-10, “Receivables,” and, if deemed necessary, a specific reserve is allocated to the credit. The specific reserve allocated under ASC 310-10 is based on (i) the present value of expected future cash flows discounted at the loan’s effective interest rate; (ii) the loan’s observable market price; or (iii) the fair value of the collateral if the loan is collateral dependent. Substantially all of the Company’s loans evaluated as impaired under ASC 310-10 are measured using the fair value of collateral method. In limited cases, the Company may use other methods to determine the specific reserve of a loan under ASC 310-10 if such loan is not collateral dependent. The allowance based on historical loss experience on the Company’s 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 by the Company, (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 at September 30, 2018 and December 31, 2017 is as follows: September 30, 2018 Special Watch Watch List— Watch List— Pass Review List—Pass Substandard Impaired (Dollars in Thousands) Domestic Commercial $ 959,115 $ 449 $ 38,469 $ 63,296 $ 17,236 Commercial real estate: other construction & land development 1,811,960 1,662 7,171 55,517 2,130 Commercial real estate: farmland & commercial 1,759,210 59,433 38,622 120,132 4,157 Commercial real estate: multifamily 185,823 — — 936 586 Residential: first lien 419,328 — 129 916 6,173 Residential: junior lien 719,464 — 882 — 740 Consumer 45,482 — — — 1,164 Foreign 154,653 — — — 306 Total $ 6,055,035 $ 61,544 $ 85,273 $ 240,797 $ 32,492 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 at September 30, 2018 compared to December 31, 2017 can be attributed to the reclassification of one relationship secured by real estate used for day care facilities from Pass. The increase in Watch List – Pass credits at September 30, 2018 can be attributed to the reclassification of a relationship in the oil and gas production business from Watch List - Substandard. The decrease in Commercial Watch List-Substandard credits at September 30, 2018 compared to December 31, 2017 can be primarily attributed to the payoff of a loan relationship secured by barges used in the transportation of petroleum products and the reclassification of a relationship in the oil and gas production business to Watch List - Pass. The increase in Commercial real estate: farmland and commercial Watch List – Substandard credits at September 30, 2018 compared to December 31, 2017 can be attributed to the reclassification of a relationship secured by commercial real estate leased by car dealerships from Pass. The decrease in Watch List-Impaired at September 30, 2018 compared to December 31, 2017 can be attributed to the foreclosure of a loan relationship primarily secured by a water park.

Stock Options

Stock Options	9 Months Ended
	Sep. 30, 2018
Stock Options
Stock Options	Note 5 — Stock Options On April 5, 2012, the Board of Directors adopted the 2012 International Bancshares Corporation Stock Option Plan (the “2012 Plan”). There are 800,000 shares of common stock available for stock option grants under the 2012 Plan, which may be qualified incentive stock options (“ISOs”) or non-qualified stock options. Options granted may be exercisable for a period of up to 10 years from the date of grant, excluding ISOs granted to 10% shareholders, which may be exercisable for a period of up to only five years. As of September 30, 2018, 7,625 shares were available for future grants under the 2012 Plan. A summary of option activity under the stock option plan for the nine months ended September 30, 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 229,700 38.30 Less: Options exercised 64,026 Options expired — — Options forfeited 21,113 Options outstanding at September 30, 2018 812,727 $ 15,728 Options fully vested and exercisable at September 30, 2018 322,360 $ $ 8,135 Stock-based compensation expense included in the consolidated statements of income for the three and nine months ended September 30, 2018 was $285,000 and $755,000, respectively. Stock-based compensation expense included in the consolidated statements of income for the three and nine months ended September 30, 2017 was approximately $215,000 and $699,000, respectively. As of September 30, 2018, there was approximately $3,032,000 of total unrecognized stock-based compensation cost related to non-vested options granted under the Company plans that will be recognized over a weighted average period of 2.1 years.

Investment Securities and Equit

Investment Securities and Equity Securities with Readily Determinable Fair Values	9 Months Ended
	Sep. 30, 2018
Investment Securities and Equity Securities with Readily Determinable Fair Values
Investment Securities and Equity Securities with Readily Determinable Fair Values	Note 6 — Investment Securities and Equity Securities with Readily Determinable Fair Values The Company classifies debt securities into one of three categories: held-to maturity, available-for-sale, or trading. Such debt securities are reassessed for appropriate classification at each reporting date. Securities classified as “held-to-maturity” are carried at amortized cost for financial statement reporting, while securities classified as “available-for-sale” and “trading” are carried at their fair value. Unrealized holding gains and losses are included in net income for those securities classified as “trading,” while unrealized holding gains and losses related to those securities classified as “available-for-sale” are excluded from net income and reported net of tax as other comprehensive income (loss) and accumulated other comprehensive income (loss) until realized, or in the case of losses, when deemed other than temporary. In accordance with the provisions of ASU 2016-01, which the Company adopted on January 1, 2018, unrealized holding gains and losses related to equity securities with readily determinable fair values are included in net income. The amortized cost and estimated fair value by type of investment security at September 30, 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 $ 2,400 $ — $ — $ 2,400 $ 2,400 Total investment securities $ 2,400 $ — $ — $ 2,400 $ 2,400 Available for Sale Debt Securities Gross Gross Amortized unrealized unrealized Estimated Carrying cost gains losses fair value value (1) (Dollars in Thousands) Residential mortgage-backed securities $ 3,444,855 $ 5,396 $ (129,523) $ 3,320,727 $ 3,320,727 Obligations of states and political subdivisions 186,564 2,873 (269) 189,169 189,169 Total investment securities $ 3,631,419 $ 8,269 $ (129,792) $ 3,509,896 $ 3,509,896 (1) Included in the carrying value of residential mortgage-backed securities are $529,985 of mortgage-backed securities issued by Ginnie Mae and $2,790,742 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. The amortized cost and estimated fair value of investment securities at September 30, 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 $ 1,200 $ 1,200 $ — $ — Due after one year through five years 1,200 1,200 — — Due after five years through ten years — — 500 506 Due after ten years — — 186,064 188,663 Residential mortgage-backed securities — — 3,444,855 3,320,727 Total investment securities $ 2,400 $ 2,400 $ 3,631,419 $ 3,509,896 Residential mortgage-backed securities are securities primarily issued by the Federal Home Loan Mortgage Corporation (“Freddie Mac”), Federal National Mortgage Association (“Fannie Mae”), or the Government National Mortgage Association (“Ginnie Mae”). Investments in residential mortgage-backed securities issued by Ginnie Mae are fully guaranteed by the U.S. Government. Investments in residential mortgage-backed securities issued by Freddie Mac and Fannie Mae are not fully guaranteed by the U.S. Government, however, the Company believes that the quality of the bonds is similar to other AAA rated bonds with limited credit risk, particularly given the placement of Fannie Mae and Freddie Mac into conservatorship by the federal government in early September 2008 and because securities issued by others that are collateralized by residential mortgage-backed securities issued by Fannie Mae or Freddie Mac are rated consistently as AAA rated securities. The amortized cost and fair value of available-for-sale debt investment securities pledged to qualify for fiduciary powers, to secure public monies as required by law, repurchase agreements and short-term fixed borrowings was $1,111,062,000 and $1,068,227,000, respectively, at September 30, 2018. Proceeds from the sale and calls of debt securities available-for-sale were $19,530,000 and $37,675,000 for the three and nine months ended September 30, 2018, which included $0 and $0 of mortgage-backed securities. Gross gains of $2,000 and $3,000 and gross losses of $0 and $0 were realized on the sales and calls for the three and nine months ended September 30, 2018. Proceeds from the sale and call of debt securities available-for-sale were $7,235,000 and $279,419,000 for the three and nine months ended September 30, 2017, respectively, which included $0 and $266,967,000 of mortgage-backed securities, respectively. Gross gains of $0 and $1,186,000 and gross losses of $0 and $2,798,000 were realized on the sales and calls for the three and nine months ended September 30, 2017. Gross unrealized losses on debt investment securities and the fair value of the related securities, aggregated by investment category and length of time that individual debt securities have been in a continuous unrealized loss position at September 30, 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 $ 812,981 $ (18,128) $ 2,210,870 $ (111,395) $ 3,023,851 $ (129,523) Obligations of states and political subdivisions 19,958 (261) 513 (8) 20,471 (269) $ 832,939 $ (18,389) $ 2,211,383 $ (111,403) $ 3,044,322 $ (129,792) 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, 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, the Company believes 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. The Company has no intent to sell and will more than likely not be required to sell before a market price recovery or maturity of the securities; therefore, it is the conclusion of the Company that the investments in residential mortgage-backed securities issued by Freddie Mac, Fannie Mae and Ginnie Mae are not considered other-than-temporarily impaired. Equity securities with readily determinable fair values consist primarily of Community Reinvestment Act funds. At September 30, 2018 and December 31, 2017, the balance in equity securities with readily determinable fair values recorded at fair value were $6,013,000 and $27,885,000, 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. The following is a summary of unrealized and realized gains and losses recognized in net income on equity securities during the three and nine months ended September 30, 2018: Three Months Ended September 30, (Dollars in Thousands) 2018 Net losses recognized during the period on equity securities $ (62) Less: Net gains and (losses) recognized during the period on equity securities sold during the period (771) Unrealized gains recognized during the reporting period on equity securities still held at the reporting date $ 709 Nine Months Ended September 30, (Dollars in Thousands) 2018 Net losses recognized during the period on equity securities $ (1,083) Less: Net gains and (losses) recognized during the period on equity securities sold during the period (771) Unrealized losses recognized during the reporting period on equity securities still held at the reporting date $ (312)

Other Borrowed Funds

Other Borrowed Funds	9 Months Ended
	Sep. 30, 2018
Other Borrowed Funds
Other Borrowed Funds	Note 7 — Other Borrowed Funds Other borrowed funds include FHLB borrowings, which are short-term and long-term borrowings issued by the FHLB of Dallas at the market price offered at the time of funding. These borrowings are secured by residential mortgage-backed investment securities and a portion of the Company’s loan portfolio. At September 30, 2018, other borrowed funds totaled $674,900,000, a decrease of 43.5% from $1,195,225,000 at December 31, 2017.

Junior Subordinated Interest De

Junior Subordinated Interest Deferrable Debentures	9 Months Ended
	Sep. 30, 2018
Junior Subordinated Interest Deferrable Debentures
Junior Subordinated Interest Deferrable Debentures	Note 8 — Junior Subordinated Interest Deferrable Debentures The Company has six statutory business trusts under the laws of the State of Delaware, for the purpose of issuing trust preferred securities. The six statutory business trusts formed by the Company (the “Trusts”) have each issued Capital and Common Securities and invested the proceeds thereof in an equivalent amount of junior subordinated debentures (“Debentures”) issued by the Company. As of September 30, 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 present and future senior indebtedness (as defined in the respective Indentures) of the Company, 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. The Company has fully and unconditionally guaranteed the obligations of each of the Trusts with respect to the Capital and Common Securities. The Company has 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 of the Company and not consolidated in the consolidated financial statements. Although the Capital and Common Securities issued by each of the Trusts are not included as a component of shareholders’ equity on the consolidated statement of condition, the Capital and Common Securities are treated as capital for regulatory purposes. Specifically, under applicable regulatory guidelines, the Capital and Common Securities issued by the Trusts qualify as Tier 1 capital up to a maximum of 25% of Tier 1 capital on an aggregate basis. Any amount that exceeds the 25% threshold would qualify as Tier 2 capital. At September 30, 2018 and December 31, 2017, the total $160,416,000 of the Capital and Common Securities outstanding qualified as Tier 1 capital. The following table illustrates key information about each of the Capital and Common Securities and their interest rate at September 30, 2018: Junior Subordinated Deferrable Interest Repricing Interest Interest Optional Debentures Frequency Rate Rate Index Maturity Date Redemption Date (1) (Dollars in Thousands) Trust VI $ 25,774 Quarterly 5.76 % LIBOR + November 2032 February 2008 Trust VIII 25,774 Quarterly 5.39 % LIBOR + October 2033 October 2008 Trust IX 41,238 Quarterly 3.96 % LIBOR + October 2036 October 2011 Trust X 21,021 Quarterly 3.99 % LIBOR + February 2037 February 2012 Trust XI 25,990 Quarterly 3.96 % LIBOR + July 2037 July 2012 Trust XII 20,619 Quarterly 3.77 % LIBOR + September 2037 September 2012 $ 160,416 (1) The Capital and Common Securities may be redeemed in whole or in part on any interest payment date after the Optional Redemption Date.

Common Stock and Dividends

Common Stock and Dividends	9 Months Ended
	Sep. 30, 2018
Common Stock and Dividends
Common Stock and Dividends	Note 9 — Common Stock and Dividends In connection with the Company’s participation in the Troubled Asset Relief Program Capital Purchase Program in 2008, the US Treasury received a warrant (“Warrant”) to purchase 1,326,238 shares of the Company’s common stock at $24.43 per share. The term of the Warrant is ten years and was immediately exercisable. The Warrant is included as a component of Tier 1 capital. On June 12, 2013, the U. S. Treasury sold the Warrant to a third party. On September 19, 2018, the Company 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. On April 16 and October 16, 2018, and the Company paid cash dividends of $0.33 and $0.42 per share to record holders of the Company’s common stock on April 2 and October 9, 2018, respectively. On April 17 and October 16, 2017, the Company paid cash dividends of $0.33 per share to record holders of the Company’s common stock on April 13, and September 29, 2017, respectively. In April 2009, following receipt of the Treasury Department’s consent, the Board of Directors re‑established a formal stock repurchase program that authorized the repurchase of up to $40 million of common stock within the following 12 months. Annually since then, including on March 15, 2018, the Board of Directors extended the repurchase program and authorized the purchase of up to $40 million of common stock during each successive 12 month period commencing again on April 9, 2018. Shares of common stock may be purchased from time to time on the open market or through privately negotiated transactions. Shares purchased in this program will be held in treasury for reissue for various corporate purposes, including employee compensation plans. During the first quarter of 2018, the Board of Directors adopted a Rule 10b5‑1 trading plan, and intends to adopt additional Rule 10b5‑1 trading plans, that will allow the Company to purchase shares of its common stock during certain trading blackout periods when the Company ordinarily would not be in the market due to trading restrictions in its insider trading policy. During the term of a Rule 10b5‑1 trading plan, purchases of common stock are automatic to the extent the conditions of the plan’s trading instructions are met. Shares purchased under the Rule 10b5-1 trading plan will be held in treasury for reissue for various corporate purposes, including employee stock compensation plans. As of November 5, 2018, a total of 9,246,956 shares had been repurchased under all programs at a cost of $271,347,000. The Company is not obligated to purchase shares under its stock repurchase program outside of its Rule 10b5-1 trading plan.

Commitments, Contingent Liabili

Commitments, Contingent Liabilities and Other Tax Matters	9 Months Ended
	Sep. 30, 2018
Commitments, Contingent Liabilities and Other Tax Matters
Commitments, Contingent Liabilities and Other Tax Matters	Note 10 — Commitments and Contingent Liabilities and Other Tax Matters The Company is involved in various legal proceedings that are in various stages of litigation. The Company has determined, based on discussions with its counsel, that any material loss in such actions, individually or in the aggregate, is remote or the damages sought, even if fully recovered, would not be considered material to the consolidated financial position or results of operations of the Company. However, many of these matters are in various stages of proceedings and further developments could cause management to revise its assessment of these matters. 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. The Company was 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 revaluation resulted in a net benefit to the Company of $3,168,000 and was included as a reduction to income tax expense in the consolidated income statement for the year ended December 31, 2017. No adjustments to the revalued carrying value for deferred tax assets or liabilities were made during the three or nine months ended September 30, 2018.

Capital Ratios

Capital Ratios	9 Months Ended
	Sep. 30, 2018
Capital Ratios
Capital Ratios	Note 11 — Capital Ratios Banks and bank holding companies are subject to various regulatory capital requirements administered by state and federal banking agencies. Capital adequacy guidelines and, additionally for banks, prompt corrective action regulations, involve quantitative measures of assets, liabilities, and certain off-balance sheet items calculated under regulatory accounting practices. Capital amount and classifications are also subject to qualitative judgements by regulators about components, risk-weighting and other factors. In July 2013, the Federal Deposit Insurance Corporation (“FDIC”) and other regulatory bodies established a new, comprehensive capital framework for U.S. banking organizations, consisting of minimum requirements that increase both the quantity and quality of capital held by banking organizations. The final rules are a result of the implementation of the BASEL III capital reforms and various Dodd-Frank Wall Street Reform and Consumer Protection Act (“Dodd-Frank”) related capital provisions. Consistent with the Basel international framework, the rules include a minimum ratio of Common Equity Tier 1 (“CET1”) to risk-weighted assets of 4.5% and a CET1 capital conservation buffer of 2.5% of risk-weighted assets. The capital conservation buffer began phasing-in on January 1, 2016 at .625% and will increase each year until January 1, 2019, when the Company will be required to have a 2.5% capital conservation buffer, effectively resulting in a minimum ratio of CET1 capital to risk-weighted assets of at least 7% upon full implementation. The rules also raised the minimum ratio of Tier 1 capital to risk-weighted assets from 4% to 6% and include a minimum leverage ratio of 4% for all banking organizations. Regarding the quality of capital, the rules emphasize CET1 capital and implements strict eligibility criteria for regulatory capital instruments. The rules also improve the methodology for calculating risk-weighted assets to enhance risk sensitivity. The rules are subject to a four year phase in period for mandatory compliance and the Company was required to begin to phase in the rules beginning on January 1, 2016. Management believes, as of September 30, 2018, that the Company and each of the bank subsidiaries will meet all capital adequacy requirements once the capital conservation is fully phased-in. 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 Company’s bank subsidiaries, 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 (“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. The Company had a CET1 to risk-weighted assets ratio of 17.37% on September 30, 2018 and 17.11% on December 31, 2017. The Company had a Tier 1 capital-to-average-total-asset (leverage) ratio of 15.53% and 14.62%, risk-weighted Tier 1 capital ratio of 18.91% and 18.73% and risk-weighted total capital ratio of 19.59% and 19.51% at September 30, 2018 and December 31, 2017, respectively. The Company’s CET1 capital consists of common stock and related surplus, net of treasury stock, and retained earnings. The Company and its subsidiary banks elected to opt-out of the requirement to include most components of accumulated other comprehensive income (loss) in the calculation of CET1 capital. CET1 is reduced by goodwill and other intangible assets, net of associated deferred tax liabilities and subject to transition provisions. Tier 1 capital includes CET1 capital and additional Tier 1 capital. Additional Tier 1 capital of the Company includes the Capital and Common Securities issued by the Trusts (see Note 8 above) up to a maximum of 25% of Tier 1 capital on an aggregate basis. Any amount that exceeds the 25% threshold qualifies as Tier 2 capital. As of September 30, 2018, the total of $160,416,000 of the Capital and Common Securities outstanding qualified as Tier 1 capital. The Company actively monitors the regulatory capital ratios to ensure that the Company’s bank subsidiaries are well-capitalized under the regulatory framework. The CET1, Tier 1 and Total capital ratios are calculated by dividing the respective capital amounts by risk-weighted assets. Risk-weighted assets are calculated based on regulatory requirements and include total assets, excluding goodwill and other intangible assets, allocated by risk-weight category, and certain off-balance-sheet items, among other things. The leverage ratio is calculated by dividing Tier 1 capital by adjusted quarterly average total assets, which exclude goodwill and other intangible assets, among other things. 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 September 30, 2018, capital levels at the Company exceed all capital adequacy requirements under the Basel III Capital Rules as currently applicable to the Company, including the capital conservation buffer. Based on the ratios presented above, capital levels as of September 30, 2018 at the Company exceed the minimum levels necessary to be considered “well-capitalized.” The Company and its subsidiary banks are subject to the regulatory capital requirements administered by the Federal Reserve, and, for the subsidiary banks, the FDIC. Regulatory authorities can initiate certain mandatory actions if the Company or any of the subsidiary banks fail to meet the minimum capital requirements, which could have a direct material effect on our financial statements. Management believes, as of September 30, 2018, that the Company and each of its subsidiary banks meet all capital adequacy requirements to which they are subject.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2018
Fair Value Measurements
Assets and liabilities measured at fair value on a recurring basis	The following table represents assets and liabilities reported on the consolidated balance sheets at their fair value on a recurring basis as of September 30, 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 September 30, 2018 (Level 1) (Level 2) (Level 3) Measured on a recurring basis: Assets: Available for sale debt securities Residential mortgage-backed securities $ 3,320,727 $ — $ 3,320,727 $ — States and political subdivisions 189,169 — 189,169 — Equity Securities 6,013 6,013 — — $ 3,515,909 $ 6,013 $ 3,509,896 $ — The following table represents assets and liabilities reported on the consolidated balance sheets at their fair value on a recurring basis as of December 31, 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 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 September 30, 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) September 30, Assets Inputs Inputs During 2018 (Level 1) (Level 2) (Level 3) Period Measured on a non-recurring basis: Assets: Impaired loans $ 8,665 $ — $ — $ 8,665 $ 716 Other real estate owned 8,886 — — 8,886 3,033 The following table represents financial instruments measured at fair value on a non-recurring basis as of and for the period 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

Loans (Tables)

Loans (Tables)	9 Months Ended
	Sep. 30, 2018
Loans
Summary of loans, by loan type	September 30, December 31, 2018 2017 (Dollars in Thousands) Commercial, financial and agricultural $ 3,247,464 $ 3,322,668 Real estate - mortgage 1,147,632 1,133,525 Real estate - construction 1,878,440 1,683,550 Consumer 46,646 49,543 Foreign 154,959 158,886 Total loans $ 6,475,141 $ 6,348,172

Allowance for Probable Loan L_2

Allowance for Probable Loan Losses (Tables)	9 Months Ended
	Sep. 30, 2018
Allowance for Probable Loan Losses
Summary of the transactions in the allowance for probable loan losses by loan class	Three Months Ended September 30, 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 June 30, $ 16,596 $ 14,703 $ 18,296 $ 1,574 $ 3,591 $ 6,793 $ 450 $ 850 $ 62,853 Losses charged to allowance (6,798) — — — (74) (133) (80) (3) (7,088) Recoveries credited to allowance 489 4 19 — 23 53 12 9 609 Net (losses) recoveries charged to allowance (6,309) 4 19 — (51) (80) (68) 6 (6,479) Provision charged to operations 3,039 397 1,050 (138) (354) 194 57 35 4,280 Balance at September 30, $ 13,326 $ 15,104 $ 19,365 $ 1,436 $ 3,186 $ 6,907 $ 439 $ 891 $ 60,654 Three Months Ended September 30, 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 June 30, $ 25,140 $ 13,249 $ 17,472 $ 997 $ 2,314 $ 4,357 $ 488 $ 902 $ 64,919 Losses charged to allowance (4,249) (213) — — (16) (202) (63) — (4,743) Recoveries credited to allowance 631 17 341 — — 85 6 5 1,085 Net (losses) recoveries charged to allowance (3,618) (196) 341 — (16) (117) (57) 5 (3,658) Provision charged to operations 5,473 (1,168) 371 — 817 995 82 21 6,591 Balance at September 30, $ 26,995 $ 11,885 $ 18,184 $ 997 $ 3,115 $ 5,235 $ 513 $ 928 $ 67,852 Nine Months Ended September 30, 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 charged to allowance (11,798) (1) (70) — (118) (172) (262) (3) (12,424) Recoveries credited to allowance 1,520 8 229 — 25 348 39 10 2,179 Net (losses) recoveries charged to allowance (10,278) 7 159 — (93) 176 (223) 7 (10,245) Provision charged to operations (4,301) 3,422 2,543 327 329 628 222 42 3,212 Balance at September 30, $ 13,326 $ 15,104 $ 19,365 $ 1,436 $ 3,186 $ 6,907 $ 439 $ 891 $ 60,654 Nine Months Ended September 30, 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 charged to allowance (9,248) (213) (40) — (77) (340) (223) — (10,141) Recoveries credited to allowance 3,484 20 488 — 7 182 35 20 4,236 Net (losses) recoveries charged to allowance (5,764) (193) 448 — (70) (158) (188) 20 (5,905) Provision charged to operations 7,110 (1,811) 1,005 191 730 1,677 170 24 9,096 Balance at September 30, $ 26,995 $ 11,885 $ 18,184 $ 997 $ 3,115 $ 5,235 $ 513 $ 928 $ 67,852
Loans individually or collectively evaluated for their impairment and related allowance, by loan class	September 30, 2018 Loans Individually Loans Collectively Evaluated For Evaluated For Impairment Impairment Recorded Recorded Investment Allowance Investment Allowance (Dollars in Thousands) Domestic Commercial $ 17,236 $ 584 $ 1,061,329 $ 12,742 Commercial real estate: other construction & land development 2,130 116 1,876,310 14,988 Commercial real estate: farmland & commercial 4,157 — 1,977,397 19,365 Commercial real estate: multifamily 586 — 186,759 1,436 Residential: first lien 6,173 — 420,373 3,186 Residential: junior lien 740 — 720,346 6,907 Consumer 1,164 — 45,482 439 Foreign 306 — 154,653 891 Total $ 32,492 $ 700 $ 6,442,649 $ 59,954 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	September 30, 2018 December 31, 2017 (Dollars in Thousands) Domestic Commercial $ 17,199 $ 17,909 Commercial real estate: other construction & land development 2,130 2,455 Commercial real estate: farmland & commercial 4,157 33,123 Commercial real estate: multifamily 586 476 Residential: first lien 197 712 Residential: junior lien — 11 Consumer 31 44 Total non-accrual loans $ 24,300 $ 54,730
Impaired loans, by loan class	September 30, 2018 Quarter to Date Year to Date Unpaid Average Average Recorded Principal Related Recorded Interest Recorded Interest Investment Balance Allowance Investment Recognized Investment Recognized (Dollars in Thousands) Loans with Related Allowance Domestic Commercial $ 1,619 $ 2,212 $ 584 $ 1,620 $ — $ 1,794 $ — Commercial real estate: other construction & land development 138 169 116 139 — 142 — Total impaired loans with related allowance $ 1,757 $ 2,381 $ 700 $ 1,759 $ — $ 1,936 $ — September 30, 2018 Quarter to Date Year to Date Unpaid Average Average Recorded Principal Recorded Interest Recorded Interest Investment Balance Investment Recognized Investment Recognized (Dollars in Thousands) Loans with No Related Allowance Domestic Commercial $ 15,617 $ 43,068 $ 15,758 $ — $ 16,464 $ 2 Commercial real estate: other construction & land development 1,992 2,199 1,994 — 2,203 — Commercial real estate: farmland & commercial 4,157 4,660 5,986 — 36,633 — Commercial real estate: multifamily 586 617 590 — 575 — Residential: first lien 6,173 6,257 6,362 76 6,929 228 Residential: junior lien 740 748 743 11 807 33 Consumer 1,164 1,167 1,187 1 1,192 2 Foreign 306 306 318 4 331 11 Total impaired loans with no related allowance $ 30,735 $ 59,022 $ 32,938 $ 92 $ 65,134 $ 276 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 $ 19,354 $ 3 Commercial real estate: other construction & land development 2,310 2,455 2,336 67 Commercial real estate: farmland & commercial 32,675 33,275 8,523 110 Commercial real estate: multifamily 476 505 401 — Residential: first lien 6,852 6,968 6,860 298 Residential: junior lien 723 736 1,011 52 Consumer 1,281 1,283 1,214 1 Foreign 347 347 751 16 Total impaired loans with no related allowance $ 61,310 $ 89,664 $ 40,450 $ 547 The following table details key information regarding the Company’s impaired loans by loan class at September 30, 2017: September 30, 2017 Quarter to Date Year to Date Average Average Recorded Interest Recorded Interest Investment Recognized Investment Recognized (Dollars in Thousands) Loans with Related Allowance Domestic Commercial $ 2,215 $ — $ 2,439 $ — Commercial real estate: other construction & land development 149 — 151 — Commercial real estate: farmland & commercial 500 — 496 — Total impaired loans with related allowance $ 2,864 $ — $ 3,086 $ — September 30, 2017 Quarter to Date Year to Date Average Average Recorded Interest Recorded Interest Investment Recognized Investment Recognized (Dollars in Thousands) Loans with No Related Allowance Domestic Commercial $ 18,547 $ 1 $ 18,931 $ 2 Commercial real estate: other construction & land development 2,296 — 3,456 — Commercial real estate: farmland & commercial 7,936 21 9,456 79 Commercial real estate: multifamily 502 — 521 — Residential: first lien 6,733 81 6,903 241 Residential: junior lien 765 11 975 35 Consumer 1,317 2 1,278 2 Foreign 759 4 753 12 Total impaired loans with no related allowance $ 38,855 $ 120 $ 42,273 $ 371
Loans accounted for as trouble debt restructuring, by loan class	September 30, 2018 December 31, 2017 (Dollars in Thousands) Domestic Commercial $ 6,440 $ 6,910 Commercial real estate: farmland & commercial — — Residential: first lien 5,976 6,140 Residential: junior lien 740 712 Consumer 1,134 1,237 Foreign 306 347 Total troubled debt restructuring $ 14,596 $ 15,346
Information regarding the aging of past due loans, by loan class	September 30, 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 $ 14,468 $ 1,381 $ 17,410 $ 886 $ 33,259 $ 1,045,306 $ 1,078,565 Commercial real estate: other construction & land development 2,596 81 1,005 100 3,682 1,874,758 1,878,440 Commercial real estate: farmland & commercial 27,621 733 3,655 789 32,009 1,949,545 1,981,554 Commercial real estate: multifamily 282 — 586 — 868 186,477 187,345 Residential: first lien 4,029 709 3,538 3,435 8,276 418,270 426,546 Residential: junior lien 746 287 1,120 1,120 2,153 718,933 721,086 Consumer 410 64 52 38 526 46,120 46,646 Foreign 1,238 1,137 1,081 1,081 3,456 151,503 154,959 Total past due loans $ 51,390 $ 4,392 $ 28,447 $ 7,449 $ 84,229 $ 6,390,912 $ 6,475,141 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	September 30, 2018 Special Watch Watch List— Watch List— Pass Review List—Pass Substandard Impaired (Dollars in Thousands) Domestic Commercial $ 959,115 $ 449 $ 38,469 $ 63,296 $ 17,236 Commercial real estate: other construction & land development 1,811,960 1,662 7,171 55,517 2,130 Commercial real estate: farmland & commercial 1,759,210 59,433 38,622 120,132 4,157 Commercial real estate: multifamily 185,823 — — 936 586 Residential: first lien 419,328 — 129 916 6,173 Residential: junior lien 719,464 — 882 — 740 Consumer 45,482 — — — 1,164 Foreign 154,653 — — — 306 Total $ 6,055,035 $ 61,544 $ 85,273 $ 240,797 $ 32,492 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

Stock Options (Tables)

Stock Options (Tables)	9 Months Ended
	Sep. 30, 2018
Stock Options
Summary of option activity under stock option plans	Weighted Weighted average average remaining Aggregate Number of exercise contractual intrinsic options price term (years) value ($) (in Thousands) Options outstanding at December 31, 2017 668,166 $ Plus: Options granted 229,700 38.30 Less: Options exercised 64,026 Options expired — — Options forfeited 21,113 Options outstanding at September 30, 2018 812,727 $ 15,728 Options fully vested and exercisable at September 30, 2018 322,360 $ $ 8,135

Investment Securities and Equ_2

Investment Securities and Equity Securities with Readily Determinable Fair Values (Tables)	9 Months Ended
	Sep. 30, 2018
Investment Securities and Equity Securities with Readily Determinable Fair Values
Amortized cost and estimated fair value by type of investment security	The amortized cost and estimated fair value by type of investment security at September 30, 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 $ 2,400 $ — $ — $ 2,400 $ 2,400 Total investment securities $ 2,400 $ — $ — $ 2,400 $ 2,400 Available for Sale Debt Securities Gross Gross Amortized unrealized unrealized Estimated Carrying cost gains losses fair value value (1) (Dollars in Thousands) Residential mortgage-backed securities $ 3,444,855 $ 5,396 $ (129,523) $ 3,320,727 $ 3,320,727 Obligations of states and political subdivisions 186,564 2,873 (269) 189,169 189,169 Total investment securities $ 3,631,419 $ 8,269 $ (129,792) $ 3,509,896 $ 3,509,896 (1) Included in the carrying value of residential mortgage-backed securities are $529,985 of mortgage-backed securities issued by Ginnie Mae and $2,790,742 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.
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 $ 1,200 $ 1,200 $ — $ — Due after one year through five years 1,200 1,200 — — Due after five years through ten years — — 500 506 Due after ten years — — 186,064 188,663 Residential mortgage-backed securities — — 3,444,855 3,320,727 Total investment securities $ 2,400 $ 2,400 $ 3,631,419 $ 3,509,896
Gross unrealized losses on investment securities and the related fair value	Gross unrealized losses on debt investment securities and the fair value of the related securities, aggregated by investment category and length of time that individual debt securities have been in a continuous unrealized loss position at September 30, 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 $ 812,981 $ (18,128) $ 2,210,870 $ (111,395) $ 3,023,851 $ (129,523) Obligations of states and political subdivisions 19,958 (261) 513 (8) 20,471 (269) $ 832,939 $ (18,389) $ 2,211,383 $ (111,403) $ 3,044,322 $ (129,792) 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, 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)
Summary of unrealized and realized gains and losses recognized in net income on equity securities	Three Months Ended September 30, (Dollars in Thousands) 2018 Net losses recognized during the period on equity securities $ (62) Less: Net gains and (losses) recognized during the period on equity securities sold during the period (771) Unrealized gains recognized during the reporting period on equity securities still held at the reporting date $ 709 Nine Months Ended September 30, (Dollars in Thousands) 2018 Net losses recognized during the period on equity securities $ (1,083) Less: Net gains and (losses) recognized during the period on equity securities sold during the period (771) Unrealized losses recognized during the reporting period on equity securities still held at the reporting date $ (312)

Junior Subordinated Interest _2

Junior Subordinated Interest Deferrable Debentures (Tables)	9 Months Ended
	Sep. 30, 2018
Junior Subordinated Interest Deferrable Debentures
Junior subordinated deferrable interest debentures, major types of business trusts	Junior Subordinated Deferrable Interest Repricing Interest Interest Optional Debentures Frequency Rate Rate Index Maturity Date Redemption Date (1) (Dollars in Thousands) Trust VI $ 25,774 Quarterly 5.76 % LIBOR + November 2032 February 2008 Trust VIII 25,774 Quarterly 5.39 % LIBOR + October 2033 October 2008 Trust IX 41,238 Quarterly 3.96 % LIBOR + October 2036 October 2011 Trust X 21,021 Quarterly 3.99 % LIBOR + February 2037 February 2012 Trust XI 25,990 Quarterly 3.96 % LIBOR + July 2037 July 2012 Trust XII 20,619 Quarterly 3.77 % LIBOR + September 2037 September 2012 $ 160,416 The Capital and Common Securities may be redeemed in whole or in part on any interest payment date after the Optional Redemption Date.

Basis of Presentation (Details)

Basis of Presentation (Details)	3 Months Ended	9 Months Ended	12 Months Ended
	Jun. 30, 2018USD ($)	Sep. 30, 2018item	Dec. 31, 2017USD ($)
Basis of presentation
Number of operating segments | item		1
Number of active operating bank subsidiaries | item		5
On-time reclassification from AOCI to retained earnings, relating to the Tax Cuts and Jobs Act of 2017 | $	$ 5,979,000
Equity securities
Basis of presentation
Net unrealized loss on available-for-sale equity securities | $			$ 189,000

Fair Value (Fair Value By Level

Fair Value (Fair Value By Level) (Details) - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Assets:
Available for sale debt securities	$ 3,509,896,000	$ 4,124,185,000
Equity Securities	6,013,000	27,885,000
Marketable Securities	3,518,309,000	4,154,470,000
Assets/liabilities measured at fair value
Assets:
Available for sale debt securities	3,509,896,000
Assets/liabilities measured at fair value | Residential mortgage-backed securities
Assets:
Available for sale debt securities	3,320,727,000	3,891,233,000
Assets/liabilities measured at fair value | Obligations of states and political subdivisions
Assets:
Available for sale debt securities	189,169,000	232,951,000
Assets/liabilities measured at fair value | Equity securities
Assets:
Equity Securities		27,886,000
Measured on a recurring basis: | Assets/liabilities measured at fair value
Assets:
Marketable Securities	3,515,909,000	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	3,320,727,000	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	189,169,000	232,951,000
Measured on a recurring basis: | Assets/liabilities measured at fair value | Equity securities
Assets:
Equity Securities	6,013,000	27,886,000
Measured on a recurring basis: | Assets/liabilities measured at fair value | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Marketable Securities	6,013,000	27,886,000
Measured on a recurring basis: | Assets/liabilities measured at fair value | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities
Assets:
Equity Securities	6,013,000	27,886,000
Measured on a recurring basis: | Assets/liabilities measured at fair value | Significant Other Observable Inputs (Level 2)
Assets:
Marketable Securities	3,509,896,000	4,124,184,000
Measured on a recurring basis: | Assets/liabilities measured at fair value | Significant Other Observable Inputs (Level 2) | Residential mortgage-backed securities
Assets:
Available for sale debt securities	3,320,727,000	3,891,233,000
Measured on a recurring basis: | Assets/liabilities measured at fair value | Significant Other Observable Inputs (Level 2) | Obligations of states and political subdivisions
Assets:
Available for sale debt securities	$ 189,169,000	$ 232,951,000

Fair Value (Fair Value Measurem

Fair Value (Fair Value Measurement and Assumptions) (Details) - USD ($)	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Dec. 31, 2017
Assets:
Impaired Loans	$ 22,948,000	$ 22,948,000	$ 53,267,000
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	8,000	170,000	30,000
Adjustment to fair value in connection with other real estate owned	635,000	3,033,000	710,000
Impaired commercial collateral dependent loans	22,948,000	22,948,000	53,267,000
Impaired commercial collateral dependent receivables appraisals to determine fair value within immediately preceding twelve months	16,083,000	16,083,000	18,585,000
Impaired collateral dependent commercial loans with internal evaluation completed within last twelve months	0	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	716,000	716,000	2,138,000
Change in net provision, other real estate owned	3,033,000	3,033,000	710,000
Measured on a non-recurring basis | Significant Unobservable Inputs (Level 3)
Assets:
Impaired Loans	8,665,000	8,665,000	11,210,000
Non-financial assets:
Other real estate owned	8,886,000	8,886,000	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	8,665,000	8,665,000	11,210,000
Measured on a non-recurring basis | Assets/liabilities measured at fair value
Assets:
Impaired Loans	8,665,000	8,665,000	11,210,000
Non-financial assets:
Other real estate owned	8,886,000	8,886,000	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	$ 8,665,000	$ 8,665,000	$ 11,210,000

Fair Value Measurements (Other

Fair Value Measurements (Other Assumptions) (Details) - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Deposits
Carrying amount of time deposits	$ 1,982,635,000	$ 2,056,506,000
Significant Unobservable Inputs (Level 3)
Loans
Carrying amount of fixed rate performing loans	1,543,620,000	1,505,531,000
Estimated fair value of fixed rate performing loans	1,485,318,000	1,454,434,000
Deposits
Carrying amount of time deposits	1,982,635,000	2,056,506,000
Estimated fair value of time deposits	1,984,627,000	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	425,000,000	250,000,000
Estimated fair value of long-term FHLB borrowings	$ 423,568,000	$ 249,728,000

Loans (Details)

Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Summary of loans, by loan type
Total loans	$ 6,475,141	$ 6,348,172
Commercial, financial and agricultural
Summary of loans, by loan type
Total loans	3,247,464	3,322,668
Real estate - mortgage
Summary of loans, by loan type
Total loans	1,147,632	1,133,525
Commercial Real Estate:Other Construction and Land Development
Summary of loans, by loan type
Total loans	1,878,440	1,683,550
Consumer
Summary of loans, by loan type
Total loans	46,646	49,543
Foreign
Summary of loans, by loan type
Total loans	$ 154,959	$ 158,886

Allowance for Probable Loan L_3

Allowance for Probable Loan Losses (By Loan Class) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Allowance for probable loan losses
Balance at the beginning of the period	$ 62,853	$ 64,919	$ 67,687	$ 64,661
Losses charged to allowance	(7,088)	(4,743)	(12,424)	(10,141)
Recoveries credited to allowance	609	1,085	2,179	4,236
Net losses (recoveries) charged to allowance	(6,479)	(3,658)	(10,245)	(5,905)
Provision charged to operations	4,280	6,591	3,212	9,096
Balance at the end of the period	60,654	67,852	$ 60,654	67,852
Period of time for determining the historical charge-off experience			3 years
Commercial
Allowance for probable loan losses
Balance at the beginning of the period	16,596	25,140	$ 27,905	25,649
Losses charged to allowance	(6,798)	(4,249)	(11,798)	(9,248)
Recoveries credited to allowance	489	631	1,520	3,484
Net losses (recoveries) charged to allowance	(6,309)	(3,618)	(10,278)	(5,764)
Provision charged to operations	3,039	5,473	(4,301)	7,110
Balance at the end of the period	13,326	26,995	13,326	26,995
Commercial Real Estate:Other Construction and Land Development
Allowance for probable loan losses
Balance at the beginning of the period	14,703	13,249	11,675	13,889
Losses charged to allowance		(213)	(1)	(213)
Recoveries credited to allowance	4	17	8	20
Net losses (recoveries) charged to allowance	4	(196)	7	(193)
Provision charged to operations	397	(1,168)	3,422	(1,811)
Balance at the end of the period	15,104	11,885	15,104	11,885
Commercial Real Estate: Farmland and Commercial
Allowance for probable loan losses
Balance at the beginning of the period	18,296	17,472	16,663	16,731
Losses charged to allowance			(70)	(40)
Recoveries credited to allowance	19	341	229	488
Net losses (recoveries) charged to allowance	19	341	159	448
Provision charged to operations	1,050	371	2,543	1,005
Balance at the end of the period	19,365	18,184	19,365	18,184
Commercial Real Estate: Multifamily
Allowance for probable loan losses
Balance at the beginning of the period	1,574	997	1,109	806
Provision charged to operations	(138)		327	191
Balance at the end of the period	1,436	997	1,436	997
Residential First Lien
Allowance for probable loan losses
Balance at the beginning of the period	3,591	2,314	2,950	2,455
Losses charged to allowance	(74)	(16)	(118)	(77)
Recoveries credited to allowance	23		25	7
Net losses (recoveries) charged to allowance	(51)	(16)	(93)	(70)
Provision charged to operations	(354)	817	329	730
Balance at the end of the period	3,186	3,115	3,186	3,115
Residential Junior Lien
Allowance for probable loan losses
Balance at the beginning of the period	6,793	4,357	6,103	3,716
Losses charged to allowance	(133)	(202)	(172)	(340)
Recoveries credited to allowance	53	85	348	182
Net losses (recoveries) charged to allowance	(80)	(117)	176	(158)
Provision charged to operations	194	995	628	1,677
Balance at the end of the period	6,907	5,235	6,907	5,235
Consumer
Allowance for probable loan losses
Balance at the beginning of the period	450	488	440	531
Losses charged to allowance	(80)	(63)	(262)	(223)
Recoveries credited to allowance	12	6	39	35
Net losses (recoveries) charged to allowance	(68)	(57)	(223)	(188)
Provision charged to operations	57	82	222	170
Balance at the end of the period	439	513	439	513
Foreign
Allowance for probable loan losses
Balance at the beginning of the period	850	902	842	884
Losses charged to allowance	(3)		(3)
Recoveries credited to allowance	9	5	10	20
Net losses (recoveries) charged to allowance	6	5	7	20
Provision charged to operations	35	21	42	24
Balance at the end of the period	$ 891	$ 928	$ 891	$ 928

Allowance for Probable Loan L_4

Allowance for Probable Loan Losses (Impairment By Loan Class) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans Individually Evaluated for Impairment, Recorded Investment	$ 32,492	$ 63,204
Loans Individually Evaluated for Impairment, Allowance	700	434
Loans Collectively Evaluated for Impairment, Recorded Investment	6,442,649	6,284,968
Loans Collectively Evaluated for Impairment, Allowance	59,954	67,253
Commercial
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans Individually Evaluated for Impairment, Recorded Investment	17,236	17,947
Loans Individually Evaluated for Impairment, Allowance	584	300
Loans Collectively Evaluated for Impairment, Recorded Investment	1,061,329	1,068,520
Loans Collectively Evaluated for Impairment, Allowance	12,742	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	2,130	2,455
Loans Individually Evaluated for Impairment, Allowance	116	116
Loans Collectively Evaluated for Impairment, Recorded Investment	1,876,310	1,681,095
Loans Collectively Evaluated for Impairment, Allowance	14,988	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	4,157	33,123
Loans Individually Evaluated for Impairment, Allowance		18
Loans Collectively Evaluated for Impairment, Recorded Investment	1,977,397	2,010,162
Loans Collectively Evaluated for Impairment, Allowance	19,365	16,645
Commercial Real Estate: Multifamily
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans Individually Evaluated for Impairment, Recorded Investment	586	476
Loans Collectively Evaluated for Impairment, Recorded Investment	186,759	192,440
Loans Collectively Evaluated for Impairment, Allowance	1,436	1,109
Residential First Lien
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans Individually Evaluated for Impairment, Recorded Investment	6,173	6,852
Loans Collectively Evaluated for Impairment, Recorded Investment	420,373	425,925
Loans Collectively Evaluated for Impairment, Allowance	3,186	2,950
Residential Junior Lien
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans Individually Evaluated for Impairment, Recorded Investment	740	723
Loans Collectively Evaluated for Impairment, Recorded Investment	720,346	700,025
Loans Collectively Evaluated for Impairment, Allowance	6,907	6,103
Consumer
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans Individually Evaluated for Impairment, Recorded Investment	1,164	1,281
Loans Collectively Evaluated for Impairment, Recorded Investment	45,482	48,262
Loans Collectively Evaluated for Impairment, Allowance	439	440
Foreign
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans Individually Evaluated for Impairment, Recorded Investment	306	347
Loans Collectively Evaluated for Impairment, Recorded Investment	154,653	158,539
Loans Collectively Evaluated for Impairment, Allowance	$ 891	$ 842

Allowance for Probable Loan L_5

Allowance for Probable Loan Losses (Non-accrual Basis By Loan Class) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Loan loss allowances, financing receivable past due
Non-accrual loans, total	$ 24,300	$ 54,730
Commercial
Loan loss allowances, financing receivable past due
Non-accrual loans, total	17,199	17,909
Commercial Real Estate:Other Construction and Land Development
Loan loss allowances, financing receivable past due
Non-accrual loans, total	2,130	2,455
Commercial Real Estate: Farmland and Commercial
Loan loss allowances, financing receivable past due
Non-accrual loans, total	4,157	33,123
Commercial Real Estate: Multifamily
Loan loss allowances, financing receivable past due
Non-accrual loans, total	586	476
Residential First Lien
Loan loss allowances, financing receivable past due
Non-accrual loans, total	197	712
Residential Junior Lien
Loan loss allowances, financing receivable past due
Non-accrual loans, total		11
Consumer
Loan loss allowances, financing receivable past due
Non-accrual loans, total	$ 31	$ 44

Allowance for Probable Loan L_6

Allowance for Probable Loan Losses (Impaired Loans) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Interest Recognized
Total trouble debt restructuring	$ 14,596		$ 14,596		$ 15,346
Period of time for determining the historical charge-off experience			3 years
Period of charge off for past due unsecured commercial loans			90 days
Class of Financing Receivable
Recorded investment:
Total impaired loans with related allowance	1,757		$ 1,757		1,894
Total impaired loans with no related allowance	30,735		30,735		61,310
Unpaid principal balance:
Total impaired loans with an allowance recorded	2,381		2,381		2,336
Total impaired loans with no related allowance recorded	59,022		59,022		89,664
Related Allowance	700		700		434
Average recorded investment:
Total impaired loans with an allowance recorded	1,759	$ 2,864	1,936	$ 3,086	1,985
Total impaired loans with no related allowance recorded	32,938	38,855	65,134	42,273	40,450
Interest Recognized
Total impaired loans with no related allowance recorded	92	120	276	371	547
Receivables from Domestic Operations [Member] | Class of Financing Receivable
Recorded investment:
Total impaired loans with related allowance	138		138
Unpaid principal balance:
Total impaired loans with an allowance recorded	169		169
Related Allowance	116		116
Average recorded investment:
Total impaired loans with an allowance recorded	139		142
Commercial
Interest Recognized
Total trouble debt restructuring	6,440		6,440		6,910
Commercial | Class of Financing Receivable
Recorded investment:
Total impaired loans with no related allowance	15,617		15,617		16,646
Unpaid principal balance:
Total impaired loans with no related allowance recorded	43,068		43,068		44,095
Average recorded investment:
Total impaired loans with an allowance recorded		2,215		2,439
Total impaired loans with no related allowance recorded	15,758	18,547	16,464	18,931	19,354
Interest Recognized
Total impaired loans with no related allowance recorded		1	2	2	3
Commercial Real Estate:Other Construction and Land Development | Class of Financing Receivable
Recorded investment:
Total impaired loans with related allowance	1,619		1,619		1,300
Total impaired loans with no related allowance	1,992		1,992		2,310
Unpaid principal balance:
Total impaired loans with an allowance recorded	2,212		2,212		1,577
Total impaired loans with no related allowance recorded	2,199		2,199		2,455
Related Allowance	584		584		300
Average recorded investment:
Total impaired loans with an allowance recorded	1,620	149	1,794	151	1,346
Total impaired loans with no related allowance recorded	1,994	2,296	2,203	3,456	2,336
Interest Recognized
Total impaired loans with no related allowance recorded					67
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	4,157		4,157		32,675
Unpaid principal balance:
Total impaired loans with an allowance recorded					169
Total impaired loans with no related allowance recorded	4,660		4,660		33,275
Related Allowance					116
Average recorded investment:
Total impaired loans with an allowance recorded		500		496	150
Total impaired loans with no related allowance recorded	5,986	7,936	36,633	9,456	8,523
Interest Recognized
Total impaired loans with no related allowance recorded		21		79	110
Commercial Real Estate: Multifamily | Class of Financing Receivable
Recorded investment:
Total impaired loans with related allowance					449
Total impaired loans with no related allowance	586		586		476
Unpaid principal balance:
Total impaired loans with an allowance recorded					590
Total impaired loans with no related allowance recorded	617		617		505
Related Allowance					18
Average recorded investment:
Total impaired loans with an allowance recorded					489
Total impaired loans with no related allowance recorded	590	502	575	521	401
Residential First Lien
Interest Recognized
Total trouble debt restructuring	5,976		5,976		6,140
Residential First Lien | Class of Financing Receivable
Recorded investment:
Total impaired loans with no related allowance	6,173		6,173		6,852
Unpaid principal balance:
Total impaired loans with no related allowance recorded	6,257		6,257		6,968
Average recorded investment:
Total impaired loans with no related allowance recorded	6,362	6,733	6,929	6,903	6,860
Interest Recognized
Total impaired loans with no related allowance recorded	76	81	228	241	298
Residential Junior Lien
Interest Recognized
Total trouble debt restructuring	740		740		712
Residential Junior Lien | Class of Financing Receivable
Recorded investment:
Total impaired loans with no related allowance	740		740		723
Unpaid principal balance:
Total impaired loans with no related allowance recorded	748		748		736
Average recorded investment:
Total impaired loans with no related allowance recorded	743	765	807	975	1,011
Interest Recognized
Total impaired loans with no related allowance recorded	11	11	33	35	52
Consumer
Interest Recognized
Total trouble debt restructuring	1,134		1,134		1,237
Consumer | Class of Financing Receivable
Recorded investment:
Total impaired loans with no related allowance	1,164		1,164		1,281
Unpaid principal balance:
Total impaired loans with no related allowance recorded	1,167		1,167		1,283
Average recorded investment:
Total impaired loans with no related allowance recorded	1,187	1,317	1,192	1,278	1,214
Interest Recognized
Total impaired loans with no related allowance recorded	1	2	2	2	1
Foreign
Interest Recognized
Total trouble debt restructuring	306		306		347
Foreign | Class of Financing Receivable
Recorded investment:
Total impaired loans with no related allowance	306		306		347
Unpaid principal balance:
Total impaired loans with no related allowance recorded	306		306		347
Average recorded investment:
Total impaired loans with no related allowance recorded	318	759	331	753	751
Interest Recognized
Total impaired loans with no related allowance recorded	$ 4	$ 4	$ 11	$ 12	$ 16

Allowance for Probable Loan L_7

Allowance for Probable Loan Losses (Aging By Loan Class) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Financing receivable recorded investment
Past due	$ 84,229	$ 77,053
Past due 90 days or Greater and Still Accruing	7,449	7,257
Loans, current	6,390,912	6,271,119
Total loans	6,475,141	6,348,172
30 to 59 Days
Financing receivable recorded investment
Past due	51,390	15,855
60 to 89 Days
Financing receivable recorded investment
Past due	4,392	4,429
90 Days or Greater
Financing receivable recorded investment
Past due	28,447	56,769
Commercial
Financing receivable recorded investment
Past due	33,259	22,496
Past due 90 days or Greater and Still Accruing	886	537
Loans, current	1,045,306	1,063,971
Total loans	1,078,565	1,086,467
Commercial | 30 to 59 Days
Financing receivable recorded investment
Past due	14,468	3,790
Commercial | 60 to 89 Days
Financing receivable recorded investment
Past due	1,381	398
Commercial | 90 Days or Greater
Financing receivable recorded investment
Past due	17,410	18,308
Commercial Real Estate:Other Construction and Land Development
Financing receivable recorded investment
Past due	3,682	1,482
Past due 90 days or Greater and Still Accruing	100	6
Loans, current	1,874,758	1,682,068
Total loans	1,878,440	1,683,550
Commercial Real Estate:Other Construction and Land Development | 30 to 59 Days
Financing receivable recorded investment
Past due	2,596	354
Commercial Real Estate:Other Construction and Land Development | 60 to 89 Days
Financing receivable recorded investment
Past due	81	308
Commercial Real Estate:Other Construction and Land Development | 90 Days or Greater
Financing receivable recorded investment
Past due	1,005	820
Commercial Real Estate: Farmland and Commercial
Financing receivable recorded investment
Past due	32,009	35,576
Past due 90 days or Greater and Still Accruing	789	954
Loans, current	1,949,545	2,007,709
Total loans	1,981,554	2,043,285
Commercial Real Estate: Farmland and Commercial | 30 to 59 Days
Financing receivable recorded investment
Past due	27,621	3,925
Commercial Real Estate: Farmland and Commercial | 60 to 89 Days
Financing receivable recorded investment
Past due	733	518
Commercial Real Estate: Farmland and Commercial | 90 Days or Greater
Financing receivable recorded investment
Past due	3,655	31,133
Commercial Real Estate: Multifamily
Financing receivable recorded investment
Past due	868	560
Loans, current	186,477	192,356
Total loans	187,345	192,916
Commercial Real Estate: Multifamily | 30 to 59 Days
Financing receivable recorded investment
Past due	282	84
Commercial Real Estate: Multifamily | 90 Days or Greater
Financing receivable recorded investment
Past due	586	476
Residential First Lien
Financing receivable recorded investment
Past due	8,276	10,848
Past due 90 days or Greater and Still Accruing	3,435	3,861
Loans, current	418,270	421,929
Total loans	426,546	432,777
Residential First Lien | 30 to 59 Days
Financing receivable recorded investment
Past due	4,029	4,295
Residential First Lien | 60 to 89 Days
Financing receivable recorded investment
Past due	709	2,458
Residential First Lien | 90 Days or Greater
Financing receivable recorded investment
Past due	3,538	4,095
Residential Junior Lien
Financing receivable recorded investment
Past due	2,153	3,000
Past due 90 days or Greater and Still Accruing	1,120	1,099
Loans, current	718,933	697,748
Total loans	721,086	700,748
Residential Junior Lien | 30 to 59 Days
Financing receivable recorded investment
Past due	746	1,310
Residential Junior Lien | 60 to 89 Days
Financing receivable recorded investment
Past due	287	580
Residential Junior Lien | 90 Days or Greater
Financing receivable recorded investment
Past due	1,120	1,110
Consumer
Financing receivable recorded investment
Past due	526	1,126
Past due 90 days or Greater and Still Accruing	38	133
Loans, current	46,120	48,417
Total loans	46,646	49,543
Consumer | 30 to 59 Days
Financing receivable recorded investment
Past due	410	868
Consumer | 60 to 89 Days
Financing receivable recorded investment
Past due	64	98
Consumer | 90 Days or Greater
Financing receivable recorded investment
Past due	52	160
Foreign
Financing receivable recorded investment
Past due	3,456	1,965
Past due 90 days or Greater and Still Accruing	1,081	667
Loans, current	151,503	156,921
Total loans	154,959	158,886
Foreign | 30 to 59 Days
Financing receivable recorded investment
Past due	1,238	1,229
Foreign | 60 to 89 Days
Financing receivable recorded investment
Past due	1,137	69
Foreign | 90 Days or Greater
Financing receivable recorded investment
Past due	$ 1,081	$ 667

Allowance for Probable Loan L_8

Allowance for Probable Loan Losses (Portfolio Credit Quality By Loan Class) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Loan portfolio by credit quality indicator
Portfolio, total	$ 6,475,141	$ 6,348,172
Pass
Loan portfolio by credit quality indicator
Portfolio, total	6,055,035	5,911,001
Special Review
Loan portfolio by credit quality indicator
Portfolio, total	61,544	6,612
Watch List - Pass
Loan portfolio by credit quality indicator
Portfolio, total	85,273	45,662
Watch List - Substandard
Loan portfolio by credit quality indicator
Portfolio, total	240,797	321,693
Watch - List Impaired
Loan portfolio by credit quality indicator
Portfolio, total	32,492	63,204
Commercial
Loan portfolio by credit quality indicator
Portfolio, total	1,078,565	1,086,467
Commercial | Pass
Loan portfolio by credit quality indicator
Portfolio, total	959,115	905,707
Commercial | Special Review
Loan portfolio by credit quality indicator
Portfolio, total	449
Commercial | Watch List - Pass
Loan portfolio by credit quality indicator
Portfolio, total	38,469	3,170
Commercial | Watch List - Substandard
Loan portfolio by credit quality indicator
Portfolio, total	63,296	159,643
Commercial | Watch - List Impaired
Loan portfolio by credit quality indicator
Portfolio, total	17,236	17,947
Commercial Real Estate:Other Construction and Land Development
Loan portfolio by credit quality indicator
Portfolio, total	1,878,440	1,683,550
Commercial Real Estate:Other Construction and Land Development | Pass
Loan portfolio by credit quality indicator
Portfolio, total	1,811,960	1,616,604
Commercial Real Estate:Other Construction and Land Development | Special Review
Loan portfolio by credit quality indicator
Portfolio, total	1,662	1,288
Commercial Real Estate:Other Construction and Land Development | Watch List - Pass
Loan portfolio by credit quality indicator
Portfolio, total	7,171	672
Commercial Real Estate:Other Construction and Land Development | Watch List - Substandard
Loan portfolio by credit quality indicator
Portfolio, total	55,517	62,531
Commercial Real Estate:Other Construction and Land Development | Watch - List Impaired
Loan portfolio by credit quality indicator
Portfolio, total	2,130	2,455
Commercial Real Estate: Farmland and Commercial
Loan portfolio by credit quality indicator
Portfolio, total	1,981,554	2,043,285
Commercial Real Estate: Farmland and Commercial | Pass
Loan portfolio by credit quality indicator
Portfolio, total	1,759,210	1,863,763
Commercial Real Estate: Farmland and Commercial | Special Review
Loan portfolio by credit quality indicator
Portfolio, total	59,433	5,134
Commercial Real Estate: Farmland and Commercial | Watch List - Pass
Loan portfolio by credit quality indicator
Portfolio, total	38,622	41,820
Commercial Real Estate: Farmland and Commercial | Watch List - Substandard
Loan portfolio by credit quality indicator
Portfolio, total	120,132	99,445
Commercial Real Estate: Farmland and Commercial | Watch - List Impaired
Loan portfolio by credit quality indicator
Portfolio, total	4,157	33,123
Commercial Real Estate: Multifamily
Loan portfolio by credit quality indicator
Portfolio, total	187,345	192,916
Commercial Real Estate: Multifamily | Pass
Loan portfolio by credit quality indicator
Portfolio, total	185,823	192,440
Commercial Real Estate: Multifamily | Watch List - Substandard
Loan portfolio by credit quality indicator
Portfolio, total	936
Commercial Real Estate: Multifamily | Watch - List Impaired
Loan portfolio by credit quality indicator
Portfolio, total	586	476
Residential First Lien
Loan portfolio by credit quality indicator
Portfolio, total	426,546	432,777
Residential First Lien | Pass
Loan portfolio by credit quality indicator
Portfolio, total	419,328	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	129
Residential First Lien | Watch List - Substandard
Loan portfolio by credit quality indicator
Portfolio, total	916	74
Residential First Lien | Watch - List Impaired
Loan portfolio by credit quality indicator
Portfolio, total	6,173	6,852
Residential Junior Lien
Loan portfolio by credit quality indicator
Portfolio, total	721,086	700,748
Residential Junior Lien | Pass
Loan portfolio by credit quality indicator
Portfolio, total	719,464	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	882
Residential Junior Lien | Watch - List Impaired
Loan portfolio by credit quality indicator
Portfolio, total	740	723
Consumer
Loan portfolio by credit quality indicator
Portfolio, total	46,646	49,543
Consumer | Pass
Loan portfolio by credit quality indicator
Portfolio, total	45,482	48,262
Consumer | Watch - List Impaired
Loan portfolio by credit quality indicator
Portfolio, total	1,164	1,281
Foreign
Loan portfolio by credit quality indicator
Portfolio, total	154,959	158,886
Foreign | Pass
Loan portfolio by credit quality indicator
Portfolio, total	154,653	158,539
Foreign | Watch - List Impaired
Loan portfolio by credit quality indicator
Portfolio, total	$ 306	$ 347

Stock Options (Details)

Stock Options (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Apr. 05, 2012
Stock options under 2012 Plan
Stock option details
Shares available for future grants	7,625		7,625		800,000
Maximum exercisable period for options granted			10 years
Stock option activity
Options outstanding at the beginning of the period (in shares)			668,166
Plus: Options granted (in shares)			229,700
Less:
Options exercised (in shares)			64,026
Options forfeited (in shares)			21,113
Options outstanding at the end of the period (in shares)	812,727		812,727
Options fully vested and exercisable at the end of the period (in shares)	322,360		322,360
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)			38.30
Less:
Options exercised, weighted average exercise price (in dollars per share)			18
Options forfeited, weighted average exercise price (in dollars per share)			20.83
Options outstanding at the end, weighted average exercise price (in dollars per share)	$ 25.65		25.65
Options fully vested and exercisable at the end, weighted average exercise price (in dollars per share)	$ 19.77		$ 19.77
Stock Options, Weighted average remaining contractual term (years)
Options outstanding at the end, weighted average remaining contractual term (years)			6 years 2 months 19 days
Options fully vested and exercisable at the end, weighted average remaining contractual term (years)			4 years 4 months 13 days
Stock Options, Aggregate intrinsic value
Options outstanding at the end, aggregate intrinsic value	$ 15,728,000		$ 15,728,000
Options fully vested and exercisable at the end, aggregate intrinsic value	8,135,000		8,135,000
Stock-based compensation expense	285,000	$ 215,000	755,000	$ 699,000
Stock-based compensation cost, unrecognized, related to non-vested options	$ 3,032,000		$ 3,032,000
Stock-based compensation cost, unrecognized, related to non-vested options, weighted-average period of recognition			2 years 1 month 6 days
Incentive stock options granted to 10% shareholders
Stock option details
Maximum exercisable period for options granted			5 years

Investment Securities and Equ_3

Investment Securities and Equity Securities with Readily Determinable Fair Values (Details) - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Held-to-maturity securities
Amortized cost	$ 2,400,000	$ 2,400,000
Estimated fair value	2,400,000	2,400,000
Carrying Value	2,400,000	2,400,000
Available-for-sale securities
Amortized cost, Available-for-sale securities	3,631,419,000	4,196,263,000
Gross Unrealized Gains	8,269,000
Gross Unrealized Losses	(129,792,000)
Available for sale debt securities	3,509,896,000	4,124,185,000
Equity Securities	6,013,000	27,885,000
Total Amortized cost		4,196,263,000
Total Gross unrealized gains		22,274,000
Total Gross unrealized losses		66,467,000
Assets/liabilities measured at fair value
Available-for-sale securities
Available for sale debt securities	3,509,896,000
Available for sale debt securities and equity securities		4,152,070,000
Carrying Value
Available-for-sale securities
Available for sale debt securities	3,509,896,000
Available for sale debt securities and equity securities		4,152,070,000
Residential mortgage-backed securities
Available-for-sale securities
Amortized cost, Available-for-sale securities	3,444,855,000	3,943,092,000
Gross Unrealized Gains	5,396,000	14,110,000
Gross Unrealized Losses	(129,523,000)	(65,969,000)
Residential mortgage-backed securities | Assets/liabilities measured at fair value
Available-for-sale securities
Available for sale debt securities	3,320,727,000	3,891,233,000
Residential mortgage-backed securities | Carrying Value
Available-for-sale securities
Available for sale debt securities	3,320,727,000	3,891,233,000
Mortgage-backed securities by Ginnie Mae
Available-for-sale securities
Available for sale debt securities	529,985,000	654,063,000
Mortgage-backed securities by Fannie Mae and Freddie Mac
Available-for-sale securities
Available for sale debt securities	2,790,742,000	3,237,170,000
Obligations of states and political subdivisions
Available-for-sale securities
Amortized cost, Available-for-sale securities	186,564,000	225,096,000
Gross Unrealized Gains	2,873,000	7,871,000
Gross Unrealized Losses	(269,000)	(16,000)
Obligations of states and political subdivisions | Assets/liabilities measured at fair value
Available-for-sale securities
Available for sale debt securities	189,169,000	232,951,000
Obligations of states and political subdivisions | Carrying Value
Available-for-sale securities
Available for sale debt securities	189,169,000	232,951,000
Other securities
Held-to-maturity securities
Amortized cost	2,400,000	2,400,000
Estimated fair value	2,400,000	2,400,000
Carrying Value	$ 2,400,000	2,400,000
Equity securities
Available-for-sale securities
Gross Unrealized Gains		293,000
Amortized Cost, Equity securities		28,075,000
Gross Unrealized Losses, Equity securities		(482,000)
Equity securities | Assets/liabilities measured at fair value
Available-for-sale securities
Equity Securities		27,886,000
Equity securities | Carrying Value
Available-for-sale securities
Equity Securities		$ 27,886,000

Investment Securities and Equ_4

Investment Securities and Equity Securities with Readily Determinable Fair Values (Contractual Maturities and Estimated Fair Values) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Held-to-maturity debt securities amortized cost disclosures
Due in one year or less, held-to-maturity debt securities amortized cost	$ 1,200,000		$ 1,200,000
Due after one year through five years, held-to-maturity debt securities amortized cost	1,200,000		1,200,000
Amortized cost, held-to-maturity debt securities	2,400,000		2,400,000		$ 2,400,000
Held-to-maturity debt securities, Estimated fair value disclosures
Due in one year or less, held-to-maturity debt securities, Estimated fair value	1,200,000		1,200,000
Due after one year through five years, held-to-maturity debt securities, Estimated fair value	1,200,000		1,200,000
Estimated fair value	2,400,000		2,400,000		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		500,000
Due after ten years, available-for-sale debt securities amortized cost	186,064,000		186,064,000
Residential mortgage-backed securities, amortized cost	3,444,855,000		3,444,855,000
Amortized cost, Available-for-sale securities	3,631,419,000		3,631,419,000		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	506,000		506,000
Due after ten years, available-for-sale debt securities, Estimated Fair Value	188,663,000		188,663,000
Residential mortgage-backed securities, Estimated Fair Value	3,320,727,000		3,320,727,000
Estimated fair value, Available for sale securities	3,509,896,000		3,509,896,000		$ 4,124,185,000
Proceeds from sales and calls of available for sale securities	19,530,000	$ 7,235,000	37,675,000	$ 279,419,000
Proceeds from sales of mortgage-backed securities	0	0	0	266,967,000
Gross gains realized on sales	2,000	0	3,000	1,186,000
Gross losses realized on sales	0	$ 0	0	$ 2,798,000
Collateral Pledged
Available-for-sale debt securities amortized cost disclosures
Amortized cost, Available-for-sale securities	1,111,062,000		1,111,062,000
Available for sale debt securities, Estimated Fair Value Disclosures
Fair value of available for sale investment securities pledged	$ 1,068,227,000		$ 1,068,227,000

Investment Securities and Equ_5

Investment Securities and Equity Securities with Readily Determinable Fair Values (Fair Value and Gross Unrealized Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Sep. 30, 2018
Available for sale:
Fair value, less than 12 months		$ 832,939
Marketable securities, less than 12 months	$ 1,078,610
Unrealized losses, less than 12 Months		(18,389)
Marketable securities, less than 12 Months	(13,417)
Fair value, 12 months or more		2,211,383
Marketable securities, 12 months or more	2,037,996
Unrealized losses, 12 Months or More		(111,403)
Marketable securities, 12 Months or More	(53,050)
Fair value, Total		3,044,322
Marketable securities, Total	3,116,606
Unrealized losses, Total		(129,792)
Marketable securities, Total	(66,467)
Residential mortgage-backed securities
Available for sale:
Fair value, less than 12 months	1,061,577	812,981
Unrealized losses, less than 12 Months	(13,157)	(18,128)
Fair value, 12 months or more	2,029,455	2,210,870
Unrealized losses, 12 Months or More	(52,812)	(111,395)
Fair value, Total	3,091,032	3,023,851
Unrealized losses, Total	(65,969)	(129,523)
Obligations of states and political subdivisions
Available for sale:
Fair value, less than 12 months	5,534	19,958
Unrealized losses, less than 12 Months	(9)	(261)
Fair value, 12 months or more	522	513
Unrealized losses, 12 Months or More	(7)	(8)
Fair value, Total	6,056	20,471
Unrealized losses, Total	(16)	$ (269)
Equity securities
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 and Equ_6

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 ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Dec. 31, 2017
Investment Securities and Equity Securities with Readily Determinable Fair Values
Equity Securities	$ 6,013,000	$ 6,013,000	$ 27,885,000
Summary of unrealized and realized gains and losses recognized in net income on equity securities
Net losses recognized during the period on equity securities	(62,000)	(1,083,000)
Less: Net gains and (losses) recognized during the period on equity securities sold during the period	(771,000)	(771,000)
Unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting date	$ 709,000	$ (312,000)

Other Borrowed Funds (Details)

Other Borrowed Funds (Details) - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Federal Home Loan Bank advances
Other borrowed funds	$ 674,900,000	$ 1,195,225,000
Percentage of decrease in other borrowed funds	43.50%

Junior Subordinated Deferrable

Junior Subordinated Deferrable Interest Debentures (Details)	9 Months Ended
	Sep. 30, 2018USD ($)item	Dec. 31, 2017USD ($)
Junior Subordinated Interest Deferrable Debentures
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

Junior Subordinated Deferrabl_2

Junior Subordinated Deferrable Interest Debentures (Key Information) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Junior subordinated deferrable interest debentures, major types of business trusts
Junior subordinated deferrable interest debentures	$ 160,416	$ 160,416
Trust VI
Junior subordinated deferrable interest debentures, major types of business trusts
Junior subordinated deferrable interest debentures	$ 25,774
Interest rate (as a percent)	5.76%
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
Interest rate (as a percent)	5.39%
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
Interest rate (as a percent)	3.96%
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
Interest rate (as a percent)	3.99%
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
Interest rate (as a percent)	3.96%
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
Interest rate (as a percent)	3.77%
Interest rate index	LIBOR
Spread on interest rate index (as a percent)	1.45%

Common Stock and Dividends (Det

Common Stock and Dividends (Details) - USD ($)

Nov. 05, 2018

Oct. 16, 2018

Apr. 16, 2018

Oct. 16, 2017

Apr. 17, 2017

Apr. 09, 2017

Apr. 30, 2009

Sep. 30, 2018

Jun. 30, 2018

Sep. 30, 2018

Dec. 31, 2008

Apr. 03, 2018

Common Stock and Dividends

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

Payments for Repurchase of Warrants

$ 29,005,000

$ 29,005,000

Maximum cash dividend paid in semi-annual period (in dollars per share)

$ 0.33

Cash dividends paid to common shareholders (in dollars per share)

$ 0.42

$ 0.33

$ 0.33

$ 0.33

Repurchase of common stock, authorized amount

$ 40,000,000

$ 40,000,000

Period of repurchase of common stock

12 months

12 months

Cumulative number of shares repurchased under all stock repurchase programs

9,246,956

Cumulative cost of shares repurchased under all stock repurchase programs

$ 271,347,000

Commitments, Contingent Liabi_2

Commitments, Contingent Liabilities and Other Tax Matters (Details) - USD ($)	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Dec. 31, 2017
Commitments, Contingent Liabilities and Other Tax Matters
Effective tax rate (in percent)		21.00%
Net benefit included as a reduction to income tax expense			$ 3,168,000
Adjustments to the revalued carrying value for deferred tax assets or liabilities	$ 0	$ 0

Capital Ratios (Details)

Capital Ratios (Details) - USD ($) $ in Billions	Jan. 01, 2016	Sep. 30, 2018	Jun. 30, 2018	May 24, 2018	Dec. 31, 2017	Dec. 31, 2016	Jul. 31, 2013
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent)		19.59%			19.51%
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent)	0.625%					2.50%
Maximum amount of assets to exempt banks				$ 10
Maximum amount of assets for qualified bank holding companies		$ 3	$ 1
CET 1 ratio		17.37%			17.11%
Tier 1 capital (to Average Assets), Actual Ratio (as a percent)		15.53%			14.62%
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent)		18.91%			18.73%		6.00%
Term of mandatory compliance	4 years
Minimum
Community bank leverage ratio				8.00%
CET 1 ratio		7.00%
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent)						4.50%	4.00%
Maximum
Community bank leverage ratio				10.00%