United States

Securities and Exchange Commission

Washington, D.C. 20549

Form 10-Q

ý Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the quarterly period ended: ~~September 30, 2017~~March 31, 2019

¨ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the transition period from to

Commission file number: 001-13221

Cullen/Frost Bankers, Inc.

(Exact name of registrant as specified in its charter)



Texas	74-1751768
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

100 W. Houston Street, San Antonio, Texas	78205
(Address of principal executive offices)	(Zip code)

(210) 220-4011

(Registrant’s telephone number, including area code)

N/A

(Former name, former address and former fiscal year, if changed since last report)

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

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

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



Large accelerated filer	ý	Accelerated filer	¨
Non-accelerated filer	¨ (Do not check if a smaller reporting company)	Smaller reporting company	¨
		Emerging growth company	¨

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

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

As of ~~October 19, 2017~~April 18, 2019 there were ~~63,164,491~~63,093,256 shares of the registrant’s Common Stock, $.01 par value, outstanding.

Cullen/Frost Bankers, Inc.

Quarterly Report on Form 10-Q

~~September 30, 2017~~March 31, 2019

Table of Contents



		Page
Part I - Financial Information
Item 1.	Financial Statements (Unaudited)
	Consolidated Balance Sheets	3
	Consolidated Statements of Income	4
	Consolidated Statements of Comprehensive Income (Loss)	5
	Consolidated Statements of Changes in Shareholders’ Equity	6
	Consolidated Statements of Cash Flows	7
	Notes to Consolidated Financial Statements	8
Item 2.	Management's Discussion and Analysis of Financial Condition and Results of Operations	3534
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	5752
Item 4.	Controls and Procedures	5853

Part II - Other Information
Item 1.	Legal Proceedings	5954
Item 1A.	Risk Factors	5954
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	5954
Item 3.	Defaults Upon Senior Securities	5954
Item 4.	Mine Safety Disclosures	5954
Item 5.	Other Information	5954
Item 6.	Exhibits	5954

Signatures		6055

Part I. Financial Information

Item 1. Financial Statements (Unaudited)

Cullen/Frost Bankers, Inc.

Consolidated Balance Sheets

(Dollars in thousands, except per share amounts)


	September 30, 2017			December 31, 2016			March 31, 2019			December 31, 2018
Assets:
Cash and due from banks	$	503,961		$	561,838		$	521,599		$	678,791
Interest-bearing deposits	4,538,300			3,560,865			1,435,088			2,641,971
Federal funds sold and resell agreements	49,642			18,742			324,767			635,017
Total cash and cash equivalents	5,091,903			4,141,445			2,281,454			3,955,779
Securities held to maturity, at amortized cost	1,442,222			2,250,460			1,077,279			1,106,057
Securities available for sale, at estimated fair value	10,185,100			10,203,277			12,013,963			11,387,321
Trading account securities	19,721			16,703			25,231			24,086
Loans, net of unearned discounts	12,706,304			11,975,392			14,406,339			14,099,733
Less: Allowance for loan losses	(154,303		)	(153,045		)	(136,350		)	(132,132		)
Net loans	12,552,001			11,822,347			14,269,989			13,967,601
Premises and equipment, net	520,639			525,821			750,256			552,330
Goodwill	654,952			654,952			654,952			654,952
Other intangible assets, net	5,475			6,776			3,324			3,649
Cash surrender value of life insurance policies	179,789			177,884			184,371			183,473
Accrued interest receivable and other assets	338,170			396,654			403,747			457,718
Total assets	$	30,989,972		$	30,196,319		$	31,664,566		$	32,292,966

Liabilities:
Deposits:
Non-interest-bearing demand deposits	$	11,174,251		$	10,513,369		$	10,128,908		$	10,997,494
Interest-bearing deposits	15,229,018			15,298,206			16,165,955			16,151,710
Total deposits	26,403,269			25,811,575			26,294,863			27,149,204
Federal funds purchased and repurchase agreements	997,919			976,992			1,227,149			1,367,548
Junior subordinated deferrable interest debentures, net of unamortized issuance costs	136,170			136,127			136,256			136,242
Subordinated notes, net of unamortized issuance costs	98,512			99,990			98,747			98,708
Accrued interest payable and other liabilities	165,059			169,107			313,973			172,347
Total liabilities	27,800,929			27,193,791			28,070,988			28,924,049

Shareholders’ Equity:
Preferred stock, par value $0.01 per share; 10,000,000 shares authorized; 6,000,000 Series A shares ($25 liquidation preference) issued at September 30, 2017 and December 31, 2016	144,486			144,486
Common stock, par value $0.01 per share; 210,000,000 shares authorized; 64,236,306 shares issued at September 30, 2017 and 63,632,464 shares issued at December 31, 2016	642			637
Preferred stock, par value $0.01 per share; 10,000,000 shares authorized; 6,000,000 Series A shares ($25 liquidation preference) issued at March 31, 2019 and December 31, 2018							144,486			144,486
Common stock, par value $0.01 per share; 210,000,000 shares authorized; 64,236,306 shares issued at March 31, 2019 and December 31, 2018							642			642
Additional paid-in capital	951,893			906,732			970,958			967,304
Retained earnings	2,133,259			1,985,569			2,495,268			2,440,002
Accumulated other comprehensive income, net of tax	57,675			(24,623		)
Treasury stock, at cost; 1,122,721 shares at September 30, 2017 and 158,243 shares at December 31, 2016	(98,912		)	(10,273		)
Accumulated other comprehensive income (loss), net of tax							93,774			(63,600		)
Treasury stock, at cost; 1,154,950 shares at March 31, 2019 and 1,250,464 shares at December 31, 2018							(111,550		)	(119,917		)
Total shareholders’ equity	3,189,043			3,002,528			3,593,578			3,368,917
Total liabilities and shareholders’ equity	$	30,989,972		$	30,196,319		$	31,664,566		$	32,292,966

See Notes to Consolidated Financial Statements.

Cullen/Frost Bankers, Inc.

Consolidated Statements of Income

(Dollars in thousands, except per share amounts)


	Three Months Ended September 30,						Nine Months Ended September 30,					Three Months Ended March 31,
	2017			2016			2017			2016		2019		2018
Interest income:
Loans, including fees	$	138,400		$	114,368		$	392,073		$	340,303	$	185,272	$	151,202
Securities:
Taxable	23,203			25,897			72,032			77,402		24,679		20,558
Tax-exempt	54,939			53,065			167,321			154,308		59,143		56,711
Interest-bearing deposits	10,800			4,111			26,712			11,366		10,639		14,094
Federal funds sold and resell agreements	244			48			514			165		1,588		761
Total interest income	227,586			197,489			658,652			583,544		281,321		243,326
Interest expense:
Deposits	5,668			1,749			9,709			5,309		27,174		10,638
Federal funds purchased and repurchase agreements	523			44			849			152		5,016		634
Junior subordinated deferrable interest debentures	1,020			839			2,890			2,392		1,498		1,142
Other long-term borrowings	1,164			350			2,696			958		1,164		1,164
Total interest expense	8,375			2,982			16,144			8,811		34,852		13,578
Net interest income	219,211			194,507			642,508			574,733		246,469		229,748
Provision for loan losses	10,980			5,045			27,358			42,734		11,003		6,945
Net interest income after provision for loan losses	208,231			189,462			615,150			531,999		235,466		222,803
Non-interest income:
Trust and investment management fees	27,493			26,451			81,690			77,806		31,697		29,587
Service charges on deposit accounts	20,967			20,540			62,934			60,769		20,790		20,843
Insurance commissions and fees	10,892			11,029			34,441			35,812		18,406		15,980
Interchange and debit card transaction fees	5,884			5,435			17,150			15,838		3,280		3,158
Other charges, commissions and fees	10,493			10,703			29,983			29,825		9,062		9,007
Net gain (loss) on securities transactions	(4,867		)	(37		)	(4,917		)	14,866		—		(19		)
Other	10,753			7,993			25,114			21,358		13,550		12,889
Total non-interest income	81,615			82,114			246,395			256,274		96,785		91,445
Non-interest expense:
Salaries and wages	84,388			79,411			247,895			236,814		92,476		86,683
Employee benefits	17,730			17,844			57,553			55,861		23,526		21,995
Net occupancy	19,391			18,202			57,781			53,631		19,267		19,740
Furniture and equipment	18,743			17,979			54,983			53,474
Technology, furniture and equipment												21,664		19,679
Deposit insurance	4,862			4,558			15,347			12,412		2,808		4,879
Intangible amortization	405			586			1,301			1,869		325		388
Other	41,304			41,925			127,929			125,048		41,734		43,247
Total non-interest expense	186,823			180,505			562,789			539,109		201,800		196,611
Income before income taxes	103,023			91,071			298,756			249,164		130,451		117,637
Income taxes	9,892			10,852			35,131			28,622		13,955		11,157
Net income	93,131			80,219			263,625			220,542		116,496		106,480
Preferred stock dividends	2,016			2,016			6,047			6,047		2,016		2,016
Net income available to common shareholders	$	91,115		$	78,203		$	257,578		$	214,495	$	114,480	$	104,464

Earnings per common share:
Basic	$	1.43		$	1.24		$	4.02		$	3.44	$	1.80	$	1.63
Diluted	1.41			1.24			3.98			3.42		1.79		1.61

See Notes to Consolidated Financial Statements.

Cullen/Frost Bankers, Inc.

Consolidated Statements of Comprehensive Income (Loss)

(Dollars in thousands)


	Three Months Ended September 30,						Nine Months Ended September 30,						Three Months Ended March 31,
	2017			2016			2017			2016			2019			2018
Net income	$	93,131		$	80,219		$	263,625		$	220,542		$	116,496		$	106,480
Other comprehensive income (loss), before tax:
Securities available for sale and transferred securities:
Change in net unrealized gain/loss during the period	7,082			(95,641		)	131,283			191,865			198,146			(178,904		)
Change in net unrealized gain on securities transferred to held to maturity	(3,514		)	(7,278		)	(13,660		)	(24,629		)	(344		)	(2,619		)
Reclassification adjustment for net (gains) losses included in net income	4,867			37			4,917			(14,866		)	—			19
Total securities available for sale and transferred securities	8,435			(102,882		)	122,540			152,370			197,802			(181,504		)
Defined-benefit post-retirement benefit plans:
Change in the net actuarial gain/loss	—			—			—			(862		)	—			—
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit)	1,357			1,585			4,072			4,878			1,406			1,250
Total defined-benefit post-retirement benefit plans	1,357			1,585			4,072			4,016			1,406			1,250
Other comprehensive income (loss), before tax	9,792			(101,297		)	126,612			156,386			199,208			(180,254		)
Deferred tax expense (benefit) related to other comprehensive income	3,427			(35,453		)	44,314			54,736
Deferred tax expense (benefit)													41,834			(37,853		)
Other comprehensive income (loss), net of tax	6,365			(65,844		)	82,298			101,650			157,374			(142,401		)
Comprehensive income (loss)	$	99,496		$	14,375		$	345,923		$	322,192		$	273,870		$	(35,921	)

See Notes to Consolidated Financial Statements.

Cullen/Frost Bankers, Inc.

Consolidated Statements of Changes in Shareholders’ Equity

(Dollars in thousands, except per share amounts)

Nine Months Ended
September 30,
2017 2016
Total shareholders’ equity at beginning of period $ 3,002,528
$ 2,890,343
Net income 263,625
220,542
Other comprehensive income (loss) 82,298
101,650
Stock option exercises/stock unit conversions (774,799 shares in 2017 and 908,921 shares in 2016) 45,422
47,873
Stock compensation expense recognized in earnings 9,013
7,998
Purchase of treasury stock (1,135,435 shares in 2017) (100,042 ) —
Cash dividends – preferred stock (approximately $1.01 per share in both 2017 and in 2016) (6,047 ) (6,047 )
Cash dividends – common stock ($1.68 per share in 2017 and $1.61 per share in 2016) (107,754 ) (100,563 )
Total shareholders’ equity at end of period $ 3,189,043
$ 3,161,796



	Preferred Stock		Common Stock		Additional Paid-In Capital		Retained Earnings			Accumulated Other Comprehensive Income (Loss), Net of Tax			Treasury Stock			Total
Three months ended:
March 31, 2019
Balance at beginning of period	$	144,486	$	642	$	967,304	$	2,440,002		$	(63,600	)	$	(119,917	)	$	3,368,917
Cumulative effect of accounting change	—		—		—		(12,611		)	—			—			(12,611		)
Total shareholders' equity at beginning of period, as adjusted	144,486		642		967,304		2,427,391			(63,600		)	(119,917		)	3,356,306
Net income	—		—		—		116,496			—			—			116,496
Other comprehensive income, net of tax	—		—		—		—			157,374			—			157,374
Stock option exercises/stock unit conversions (100,865 shares)	—		—		—		(4,001		)	—			8,886			4,885
Stock-based compensation expense recognized in earnings	—		—		3,654		—			—			—			3,654
Purchase of treasury stock (5,351 shares)	—		—		—		—			—			(519		)	(519		)
Cash dividends – preferred stock (approximately $0.34 per share)	—		—		—		(2,016		)	—			—			(2,016		)
Cash dividends – common stock ($0.67 per share)	—		—		—		(42,602		)	—			—			(42,602		)
Balance at end of period	$	144,486	$	642	$	970,958	$	2,495,268		$	93,774		$	(111,550	)	$	3,593,578

March 31, 2018
Balance at beginning of period	$	144,486	$	642	$	953,361	$	2,187,069		$	79,512		$	(67,207	)	$	3,297,863
Cumulative effect of accounting change	—		—		—		(2,285		)	—			—			(2,285		)
Total shareholders' equity at beginning of period, as adjusted	144,486		642		953,361		2,184,784			79,512			(67,207		)	3,295,578
Net income	—		—		—		106,480			—			—			106,480
Other comprehensive loss, net of tax	—		—		—		—			(142,401		)	—			(142,401		)
Reclassification of certain income tax effects related to the change in the U.S. statutory federal income tax rate under the Tax Cuts and Jobs Act	—		—		—		(9,535		)	9,535			—			—
Stock option exercises/stock unit conversions (318,110 shares)	—		—		—		(8,861		)	—			28,026			19,165
Stock-based compensation expense recognized in earnings	—		—		3,175		—			—			—			3,175
Cash dividends – preferred stock (approximately $0.34 per share)	—		—		—		(2,016		)	—			—			(2,016		)
Cash dividends – common stock ($0.57 per share)	—		—		—		(36,551		)	—			—			(36,551		)
Balance at end of period	$	144,486	$	642	$	956,536	$	2,234,301		$	(53,354	)	$	(39,181	)	$	3,243,430

See accompanying Notes to Consolidated Financial ~~Statements.~~Statements

Cullen/Frost Bankers, Inc.

Consolidated Statements of Cash Flows

(Dollars in thousands)


	Nine Months Ended September 30,						Three Months Ended March 31,
	2017			2016			2019			2018
Operating Activities:
Net income	$	263,625		$	220,542		$	116,496		$	106,480
Adjustments to reconcile net income to net cash from operating activities:
Provision for loan losses	27,358			42,734			11,003			6,945
Deferred tax expense (benefit)	(9,505		)	(11,629		)	(1,044		)	10,411
Accretion of loan discounts	(11,567		)	(11,893		)	(3,757		)	(3,378		)
Securities premium amortization (discount accretion), net	66,455			59,071			28,696			24,260
Net (gain) loss on securities transactions	4,917			(14,866		)	—			19
Depreciation and amortization	35,819			35,712			12,752			12,130
Net (gain) loss on sale/write-down of assets/foreclosed assets	(2,045		)	(373		)	(4,437		)	(3,982		)
Stock-based compensation	9,013			7,998			3,654			3,175
Net tax benefit from stock-based compensation	5,844			1,610			716			2,211
Earnings on life insurance policies	(2,367		)	(2,678		)	(898		)	(820		)
Net change in:
Trading account securities	(3,018		)	418			1,582			1,326
Lease right-of-use assets							4,833			—
Accrued interest receivable and other assets	10,495			11,134			32,634			23,555
Accrued interest payable and other liabilities	(39,580		)	(2,806		)	(56,098		)	28,376
Net cash from operating activities	355,444			334,974			146,132			210,708

Investing Activities:
Securities held to maturity:
Purchases	—			—			—			(1,500		)
Sales	—			135,610
Maturities, calls and principal repayments	780,562			227,760			23,421			179,149
Securities available for sale:
Purchases	(9,138,457		)	(10,079,302		)	(1,526,279		)	(3,245,923		)
Sales	8,993,963			9,040,245			944,903			2,984,867
Maturities, calls and principal repayments	283,278			270,737			121,471			62,768
Proceeds from sale of loans	—			30,470			12,699			—
Net change in loans	(745,702		)	(142,698		)	(322,308		)	(227,417		)
Benefits received on life insurance policies	462			906
Proceeds from sales of premises and equipment	1,553			1,517			4,667			11,317
Purchases of premises and equipment	(23,796		)	(32,647		)	(44,039		)	(16,759		)
Proceeds from sales of repossessed properties	517			297			—			307
Net cash from investing activities	152,380			(547,105		)	(785,465		)	(253,191		)

Financing Activities:
Net change in deposits	591,694			763,953			(854,341		)	(194,611		)
Net change in short-term borrowings	20,927			(89,220		)	(140,399		)	(115,603		)
Proceeds from issuance of subordinated notes	98,434			—
Principal payments on subordinated notes	(100,000		)	—
Proceeds from stock option exercises	45,422			47,873			4,885			19,165
Purchase of treasury stock	(100,042		)	—			(519		)	—
Cash dividends paid on preferred stock	(6,047		)	(6,047		)	(2,016		)	(2,016		)
Cash dividends paid on common stock	(107,754		)	(100,563		)	(42,602		)	(36,551		)
Net cash from financing activities	442,634			615,996			(1,034,992		)	(329,616		)

Net change in cash and cash equivalents	950,458			403,865			(1,674,325		)	(372,099		)
Cash and equivalents at beginning of period	4,141,445			3,591,523
Cash and equivalents at end of period	$	5,091,903		$	3,995,388
Cash and cash equivalents at beginning of period							3,955,779			5,053,047
Cash and cash equivalents at end of period							$	2,281,454		$	4,680,948

See Notes to Consolidated Financial Statements.

Notes to Consolidated Financial Statements

(Table amounts in thousands, except for share and per share amounts)

Note 1 - Significant Accounting Policies

Nature of Operations. Cullen/Frost Bankers, Inc. (“Cullen/Frost”) is a financial holding company and a bank holding company headquartered in San Antonio, Texas that provides, through its subsidiaries, a broad array of products and services throughout numerous Texas markets. The terms “Cullen/Frost,” “the Corporation,” “we,” “us” and “our” mean Cullen/Frost Bankers, Inc. and its subsidiaries, when appropriate. In addition to general commercial and consumer banking, other products and services offered include trust and investment management, insurance, brokerage, mutual funds, leasing, treasury management, capital markets advisory and item processing.

Basis of Presentation. The consolidated financial statements in this Quarterly Report on Form 10-Q include the accounts of Cullen/Frost and all other entities in which Cullen/Frost has a controlling financial interest. All significant intercompany balances and transactions have been eliminated in consolidation. The accounting and financial reporting policies we follow conform, in all material respects, to accounting principles generally accepted in the United States and to general practices within the financial services industry.

The consolidated financial statements in this Quarterly Report on Form 10-Q have not been audited by an independent registered public accounting firm, but in the opinion of management, reflect all adjustments necessary for a fair presentation of our financial position and results of operations. All such adjustments were of a normal and recurring nature. The consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States for interim financial information and with the instructions to Form 10-Q adopted by the Securities and Exchange Commission (“SEC”). Accordingly, the financial statements do not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements and should be read in conjunction with our consolidated financial statements, and notes thereto, for the year ended December 31, ~~2016~~2018, included in our Annual Report on Form 10-K filed with the SEC on February ~~3, 2017~~6, 2019 (the ~~“2016~~“2018 Form 10-K”). Operating results for the interim periods disclosed herein are not necessarily indicative of the results that may be expected for a full year or any future period.

Use of Estimates. The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates. The allowance for loan losses and the fair values of financial instruments and the status of contingencies are particularly subject to change.

Cash Flow Reporting. Additional cash flow information was as follows:



	Three Months Ended March 31,
	2019		2018
Cash paid for interest	$	34,402	$	13,740
Cash paid for income taxes	—		—
Significant non-cash transactions:
Unsettled purchases/sales of securities	7,612		47,723
Loans foreclosed and transferred to other real estate owned and foreclosed assets	—		7
Right-of-use lease assets obtained in exchange for lessee operating lease liabilities	170,479		—

Nine Months Ended
September 30,
2017 2016
Cash paid for interest $ 15,611
$ 8,731
Cash paid for income taxes 41,969
39,160
Significant non-cash transactions:
Unsettled purchases of securities 41,763
54,342
Loans foreclosed and transferred to other real estate owned and foreclosed assets 257
422
Accounting Changes, Reclassifications and Restatements. Certain items in prior financial statements have been reclassified to conform to the current presentation. In addition, as of January 1, 2019, we adopted certain accounting standard updates related to accounting for leases (Topic 842 - Leases), primarily Accounting Standards Update (“ASU”) 2016-02 and subsequent updates. Among other things, these updates require lessees to recognize a lease liability, measured on a discounted basis, related to the lessee's obligation to make lease payments arising under a lease contract; and a right-of-use asset related to the lessee’s right to use, or control the use of, a specified asset for the lease term. The updates did not significantly change lease accounting requirements applicable to lessors and did not significantly impact our financial statements in relation to contracts whereby we act as a lessor. We adopted the updates using a modified-retrospective transition approach and recognized right-of-use lease assets and related lease liabilities totaling $170.5 million and $174.4 million respectively as of January 1, 2019. We elected to apply certain practical adoption expedients provided under the updates whereby we did not reassess (i) whether any expired or existing contracts are or contain leases, (ii) the lease classification for any expired or existing leases and (iii) initial direct costs for any existing leases. We did not elect to apply the recognition requirements of the updates to any short-term leases (as discussed below). As of March 31, 2019, right-of-use lease assets and related lease liabilities totaled $165.5 million and $171.8 million, respectively. Furthermore, during the second quarter of 2019, we expect to recognize an additional right-of-use asset and related lease liability totaling

approximately $110.0 million to $140.0 million in connection with the commencement of the lease of our new corporate headquarters facility in downtown San Antonio. See Note 6 - Commitments and Contingencies.

We lease certain office facilities and office equipment under operating leases. We also own certain office facilities which we lease to outside parties under operating lessor leases; however, such leases are not significant. We do not apply the recognition requirements of Topic 842 - Leases to short-term operating leases. A short-term operating lease has an original term of 12 months or less and does not have a purchase option that is likely to be exercised. For non-short-term operating leases, we recognized lease right-of-use assets and related lease liabilities on our balance sheet upon commencement of the lease in accordance with Topic 842 - Leases. In recognizing lease right-of-use assets and related lease liabilities, we account for lease and non-lease components (such as taxes, insurance, and common area maintenance costs) separately as such amounts are generally readily determinable under our lease contracts. Lease payments over the expected term are discounted using our incremental borrowing rate referenced to the Federal Home Loan Bank Secure Connect advance rates for borrowings of similar term. We also consider renewal and termination options in the determination of the term of the lease. If it is reasonably certain that a renewal or termination option will be exercised, the effects of such options are included in the determination of the expected lease term. Generally, we cannot be reasonably certain about whether or not we will renew a lease until such time the lease is within the last two years of the existing lease term. However, renewal options related to our regional headquarter facilities or operations centers are evaluated on a case-by-case basis, typically in advance of such time frame. When we are reasonably certain that a renewal option will be exercised, we measure/remeasure the right-of-use asset and related lease liability using the lease payments specified for the renewal period or, if such amounts are unspecified, we generally assume an increase (evaluated on a case-by-case basis in light of prevailing market conditions) in the lease payment over the final period of the existing lease term.

We also adopted ASU 2017-08 “Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20) - Premium Amortization on Purchased Callable Debt Securities” as of January 1, 2019. ASU 2017-08 shortens the amortization period for certain callable debt securities held at a premium to require such premiums to be amortized to the earliest call date unless applicable guidance related to certain pools of securities is applied to consider estimated prepayments. Under prior guidance, entities were generally required to amortize premiums on individual, non-pooled callable debt securities as a yield adjustment over the contractual life of the security. ASU 2017-08 does not change the accounting for callable debt securities held at a discount. Upon adoption, using a modified retrospective transition adoption approach, we recognized a cumulative effect reduction to retained earnings totaling$12.6 million. We expect premium amortization expense for 2019 will be approximately $5.2 million higher than what would have been the case had we continued to amortize the affected securities to their respective maturity dates.

Note 2 - Securities

Securities. A summary of the amortized cost and estimated fair value of securities, excluding trading securities, is presented below.



	March 31, 2019								December 31, 2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Held to Maturity
Residential mortgage-backed securities	$	2,656	$	6	$	53	$	2,609	$	2,737	$	8	$	85	$	2,660
States and political subdivisions	1,073,123		20,628		2		1,093,749		1,101,820		11,525		552		1,112,793
Other	1,500		—		—		1,500		1,500		—		—		1,500
Total	$	1,077,279	$	20,634	$	55	$	1,097,858	$	1,106,057	$	11,533	$	637	$	1,116,953
Available for Sale
U.S. Treasury	$	3,455,925	$	5,314	$	16,171	$	3,445,068	$	3,455,417	$	1,772	$	29,500	$	3,427,689
Residential mortgage-backed securities	1,210,179		20,610		3,354		1,227,435		823,208		13,079		6,547		829,740
States and political subdivisions	7,130,105		181,170		12,549		7,298,726		7,089,132		70,760		72,690		7,087,202
Other	42,734		—		—		42,734		42,690		—		—		42,690
Total	$	11,838,943	$	207,094	$	32,074	$	12,013,963	$	11,410,447	$	85,611	$	108,737	$	11,387,321

September 30, 2017 December 31, 2016

Amortized
Cost

Gross
Unrealized
Gains

Gross
Unrealized
Losses

Estimated
Fair Value

Amortized
Cost

Gross
Unrealized
Gains

Gross
Unrealized
Losses

Estimated
Fair Value
Held to Maturity
U.S. Treasury $ —
$ —
$ —
$ —
$ 249,889
$ 1,762
$ —
$ 251,651
Residential mortgage-backed securities 3,708
21
24
3,705
4,511
39
—
4,550
States and political subdivisions 1,437,164
36,991
2,556
1,471,599
1,994,710
16,821
6,335
2,005,196
Other 1,350
—
1
1,349
1,350
—
—
1,350
Total $ 1,442,222
$ 37,012
$ 2,581
$ 1,476,653
$ 2,250,460
$ 18,622
$ 6,335
$ 2,262,747
Available for Sale
U.S. Treasury $ 3,452,882
$ 23,796
$ 3,050
$ 3,473,628
$ 4,003,692
$ 24,984
$ 8,945
$ 4,019,731
Residential mortgage-backed securities 658,281
24,218
1,304
681,195
756,072
30,388
1,293
785,167
States and political subdivisions 5,898,098
130,142
40,501
5,987,739
5,403,918
50,101
98,134
5,355,885
Other 42,538
—
—
42,538
42,494
—
—
42,494
Total $ 10,051,799
$ 178,156
$ 44,855
$ 10,185,100
$ 10,206,176
$ 105,473
$ 108,372
$ 10,203,277

All mortgage-backed securities included in the above table were issued by U.S. government agencies and corporations. At ~~September 30, 2017,~~March 31, 2019, approximately ~~98.1%~~98.4% of the securities in our municipal bond portfolio were issued by political subdivisions or agencies within the State of Texas, of which approximately ~~67.7%~~68.7% are either guaranteed by the Texas Permanent School Fund, which has a “triple A” insurer financial strength rating, or are secured by U.S. Treasury securities via defeasance of the debt by the issuers. Securities with limited marketability ~~such as~~and that do not have readily determinable fair values are carried at cost minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for identical or similar securities of the same issuer. These securities include stock in the Federal Reserve Bank and the Federal Home Loan Bank ~~are carried at cost~~ and are reported as other available for sale securities in the table above. The carrying value of securities pledged to secure public funds, trust deposits, repurchase agreements and for other purposes, as required or permitted by law was ~~$3.5~~$3.4 billion at ~~September 30, 2017~~March 31, 2019 and ~~$3.9~~$3.8 billion at December 31, ~~2016.~~2018.

During the fourth quarter of 2012, we reclassified certain securities from available for sale to held to maturity. The securities had an aggregate fair value of $2.3 billion with an aggregate net unrealized gain of $165.7 million ($107.7 million, net of tax) on the date of the transfer. The net unamortized, unrealized gain on the remaining transferred securities included in accumulated other comprehensive income in the accompanying balance sheet as of ~~September 30, 2017~~March 31, 2019 totaled ~~$14.1~~$2.4 million ($~~9.2~~1.9 million, net of tax). This amount will be amortized out of accumulated other comprehensive income over the remaining life of the underlying securities as an adjustment of the yield on those securities.

Unrealized Losses. As of ~~September 30, 2017~~March 31, 2019, securities with unrealized losses, segregated by length of impairment, were as follows:



	Less than 12 Months				More than 12 Months				Total
	Estimated Fair Value		Unrealized Losses		Estimated Fair Value		Unrealized Losses		Estimated Fair Value		Unrealized Losses
Held to Maturity
Residential mortgage-backed securities	$	—	$	—	$	2,039	$	53	$	2,039	$	53
States and political subdivisions	—		—		2,361		2		2,361		2
Total	$	—	$	—	$	4,400	$	55	$	4,400	$	55
Available for Sale
U.S. Treasury	$	—	$	—	$	3,153,533	$	16,171	$	3,153,533	$	16,171
Residential mortgage-backed securities	1,716		1		183,952		3,353		185,668		3,354
States and political subdivisions	58,884		1,333		739,744		11,216		798,628		12,549
Total	$	60,600	$	1,334	$	4,077,229	$	30,740	$	4,137,829	$	32,074

Less than 12 Months More than 12 Months Total

Estimated
Fair Value

Unrealized
Losses

Estimated
Fair Value

Unrealized
Losses

Estimated
Fair Value

Unrealized
Losses
Held to Maturity
Residential mortgage-backed securities $ 2,212
$ 24
$ —
$ —
$ 2,212
$ 24
States and political subdivisions 5,301
28
74,965
2,528
80,266
2,556
Other 1,349
1
—
—
1,349
1
Total $ 8,862
$ 53
$ 74,965
$ 2,528
$ 83,827
$ 2,581
Available for Sale
U.S. Treasury $ 840,074
$ 3,050
$ —
$ —
$ 840,074
$ 3,050
Residential mortgage-backed securities 75,441
618
19,458
686
94,899
1,304
States and political subdivisions 986,705
9,713
842,751
30,788
1,829,456
40,501
Total $ 1,902,220
$ 13,381
$ 862,209
$ 31,474
$ 2,764,429
$ 44,855

Declines in the fair value of held-to-maturity and available-for-sale securities below their cost that are deemed to be other than temporary are reflected in earnings as realized losses to the extent the impairment is related to credit losses. The amount of the impairment related to other factors is recognized in other comprehensive income. In estimating other-than-temporary impairment losses, management considers, among other things, (i) the length of time and the extent to which the fair value has been less than cost, (ii) the financial condition and near-term prospects of the issuer, and (iii) the intent and our ability to retain our investment in the issuer for a period of time sufficient to allow for any anticipated recovery in cost.

Management has the ability and intent to hold the securities classified as held to maturity in the table above until they mature, at which time we expect to receive full value for the securities. Furthermore, as of ~~September 30, 2017,~~March 31, 2019, management does not have the intent to sell any of the securities classified as available for sale in the table above and believes that it is more likely than not that we will not have to sell any such securities before a recovery of cost. Any unrealized losses are due to increases in market interest rates over the yields available at the time the underlying securities were purchased. The fair value is expected to recover as the securities approach their maturity date or repricing date or if market yields for such investments decline. Management does not believe any of the securities are impaired due to reasons of credit quality. Accordingly, as of ~~September 30, 2017~~March 31, 2019, management believes the impairments detailed in the table above are temporary and no impairment loss has been realized in our consolidated income statement.

Contractual Maturities. The amortized cost and estimated fair value of securities, excluding trading securities, at ~~September 30, 2017~~March 31, 2019 are presented below by contractual maturity. Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations. Residential mortgage-backed securities and equity securities are shown separately since they are not due at a single maturity date.



	Held to Maturity					Available for Sale
	Amortized Cost			Estimated Fair Value		Amortized Cost		Estimated Fair Value
Due in one year or less	$	58,032	��	$	58,525	$	2,606,267	$	2,593,167
Due after one year through five years	128,835			131,725		1,662,791		1,673,779
Due after five years through ten years	505,528			514,331		375,007		390,443
Due after ten years	382,228			390,668		5,941,965		6,086,405
Residential mortgage-backed securities	2,656			2,609		1,210,179		1,227,435
Equity securities	—			—		42,734		42,734
Total	$	1,077,279		$	1,097,858	$	11,838,943	$	12,013,963

Held to Maturity Available for Sale

Amortized
Cost

Estimated
Fair Value

Amortized
Cost

Estimated
Fair Value
Due in one year or less $ 251,739
$ 256,716
$ 37,321
$ 38,127
Due after one year through five years 116,604
121,451
4,056,709
4,085,795
Due after five years through ten years 411,074
420,160
385,649
399,538
Due after ten years 659,097
674,621
4,871,301
4,937,907
Residential mortgage-backed securities 3,708
3,705
658,281
681,195
Equity securities —
—
42,538
42,538
Total $ 1,442,222
$ 1,476,653
$ 10,051,799
$ 10,185,100

Sales of Securities. As more fully discussed in our 2016 Form 10-K, during 2016, we sold certain securities issued by municipalities that, based upon our internal credit analysis, had experienced significant deterioration in creditworthiness. Some of the securities we sold were classified as held to maturity prior to their sale. Despite their classification as held to maturity, we believe the sale of these securities was merited and permissible under the applicable accounting guidelines because of the significant deterioration in the creditworthiness of the issuers.

~~Sales of securities held to maturity were as follows:~~

Three Months Ended
September 30, Nine Months Ended
September 30,
2017 2016 2017 2016
Proceeds from sales $ —
$ —
$ —
$ 135,610
Amortized cost —
—
—
131,840
Gross realized gains —
—
—
3,770
Gross realized losses —
—
—
—
Tax (expense) benefit of securities gains/losses —
—
—
(1,319 )

Sales of securities available for sale were as follows:



	Three Months Ended March 31,
	2019		2018
Proceeds from sales	$	944,903	$	2,984,867
Gross realized gains	—		—
Gross realized losses	—		(19		)
Tax (expense) benefit of securities gains/losses	—		4

Three Months Ended
September 30, Nine Months Ended
September 30,
2017 2016 2017 2016
Proceeds from sales $ 746,524
$ 7,980,049
$ 8,993,963
$ 9,040,245
Gross realized gains —
1
—
11,134
Gross realized losses (4,867 ) (38 ) (4,917 ) (38 )
Tax (expense) benefit of securities gains/losses 1,703
13
1,721
(3,884 )

Premiums and Discounts. Premium amortization and discount accretion included in interest income on securities was as follows:



	Three Months Ended March 31,
	2019			2018
Premium amortization	$	(29,879	)	$	(26,036	)
Discount accretion	1,183			1,776
Net (premium amortization) discount accretion	$	(28,696	)	$	(24,260	)

Three Months Ended
September 30, Nine Months Ended
September 30,
2017 2016 2017 2016
Premium amortization $ (24,586 ) $ (22,762 ) $ (72,733 ) $ (67,321 )
Discount accretion 1,783
2,497
6,278
8,250
Net (premium amortization) discount accretion $ (22,803 ) $ (20,265 ) $ (66,455 ) $ (59,071 )

Trading Account Securities. Trading account securities, at estimated fair value, were as follows:



	March 31, 2019		December 31, 2018
U.S. Treasury	$	22,503	$	21,928
States and political subdivisions	2,728		2,158
Total	$	25,231	$	24,086

September 30,
2017 December 31,
2016
U.S. Treasury $ 18,814
$ 16,594
States and political subdivisions 907
109
Total $ 19,721
$ 16,703

Net gains and losses on trading account securities were as follows:



	Three Months Ended March 31,
	2019		2018
Net gain on sales transactions	$	506	$	505
Net mark-to-market gains (losses)	4		(36		)
Net gain (loss) on trading account securities	$	510	$	469

Three Months Ended
September 30, Nine Months Ended
September 30,
2017 2016 2017 2016
Net gain on sales transactions $ 414
$ 379
$ 1,018
$ 1,032
Net mark-to-market gains (losses) (8 ) —
(51 ) (1 )
Net gain (loss) on trading account securities $ 406
$ 379
$ 967
$ 1,031

Note 3 - Loans

Loans were as follows:



	March 31, 2019		Percentage of Total		December 31, 2018		Percentage of Total
Commercial and industrial	$	5,368,271	37.3	%	$	5,111,957	36.3	%
Energy:
Production	1,278,366		8.9		1,309,314		9.3
Service	166,649		1.2		168,775		1.2
Other	114,058		0.7		124,509		0.9
Total energy	1,559,073		10.8		1,602,598		11.4
Commercial real estate:
Commercial mortgages	4,256,999		29.6		4,121,966		29.2
Construction	1,244,567		8.6		1,267,717		9.0
Land	311,629		2.2		306,755		2.2
Total commercial real estate	5,813,195		40.4		5,696,438		40.4
Consumer real estate:
Home equity loans	351,762		2.4		353,924		2.5
Home equity lines of credit	337,312		2.3		337,168		2.4
Other	438,678		3.1		427,898		3.0
Total consumer real estate	1,127,752		7.8		1,118,990		7.9
Total real estate	6,940,947		48.2		6,815,428		48.3
Consumer and other	538,048		3.7		569,750		4.0
Total loans	$	14,406,339	100.0	%	$	14,099,733	100.0	%

September 30,
2017
Percentage
of Total
December 31,
2016
Percentage
of Total
Commercial and industrial $ 4,677,923
36.8 % $ 4,344,000
36.3 %
Energy:
Production 1,094,927
8.6
971,767
8.1
Service 159,893
1.3
221,213
1.8
Other 132,240
1.0
193,081
1.7
Total energy 1,387,060
10.9
1,386,061
11.6
Commercial real estate:
Commercial mortgages 3,714,172
29.2
3,481,157
29.1
Construction 1,082,229
8.5
1,043,261
8.7
Land 307,701
2.4
311,030
2.6
Total commercial real estate 5,104,102
40.1
4,835,448
40.4
Consumer real estate:
Home equity loans 357,542
2.8
345,130
2.9
Home equity lines of credit 288,981
2.3
264,862
2.2
Other 367,948
2.9
326,793
2.7
Total consumer real estate 1,014,471
8.0
936,785
7.8
Total real estate 6,118,573
48.1
5,772,233
48.2
Consumer and other 522,748
4.2
473,098
3.9
Total loans $ 12,706,304
100.0 % $ 11,975,392
100.0 %

Concentrations of Credit. Most of our lending activity occurs within the State of Texas, including the four largest metropolitan areas of Austin, Dallas/Ft. Worth, Houston and San Antonio, as well as other markets. The majority of our loan portfolio consists of commercial and industrial and commercial real estate loans. As of ~~September 30, 2017,~~March 31, 2019, there were no concentrations of loans related to any single industry in excess of 10% of total loans other than energy loans, which totaled ~~10.9%~~10.8% of total loans. Unfunded commitments to extend credit and standby letters of credit issued to customers in the energy industry totaled ~~$1.1~~$1.2 billion and ~~$40.9~~$53.4 million, respectively, as of ~~September 30, 2017.~~March 31, 2019.

Foreign Loans. We have U.S. dollar denominated loans and commitments to borrowers in Mexico. The outstanding balance of these loans and the unfunded amounts available under these commitments were not significant at ~~September 30, 2017~~March 31, 2019 or December 31, ~~2016.~~2018.

Related Party Loans. In the ordinary course of business, we have granted loans to certain directors, executive officers and their affiliates (collectively referred to as “related parties”). Such loans totaled $272.4 million at March 31, 2019 and $256.1 million at December 31, 2018.

Non-Accrual and Past Due Loans. Non-accrual loans, segregated by class of loans, were as follows:



	March 31, 2019		December 31, 2018
Commercial and industrial	$	16,035	$	9,239
Energy	45,673		46,932
Commercial real estate:
Buildings, land and other	26,760		15,268
Construction	410		—
Consumer real estate	1,860		892
Consumer and other	1,424		1,408
Total	$	92,162	$	73,739

September 30,
2017 December 31,
2016
Commercial and industrial $ 37,239
$ 31,475
Energy 96,717
57,571
Commercial real estate:
Buildings, land and other 6,773
8,550
Construction —
—
Consumer real estate 2,167
2,130
Consumer and other 208
425
Total $ 143,104
$ 100,151

As of September 30, 2017, non-accrual loans reported in the table above included $54.1 million related to loans that were restructured as “troubled debt restructurings” during 2017. See the section captioned “Troubled Debt Restructurings” elsewhere in this note. Had non-accrual loans performed in accordance with their original contract terms, we would have recognized additional interest income, net of tax, of approximately ~~$783 thousand and $2.4~~$1.0 million for the three ~~and nine~~ months ended ~~September 30, 2017,~~March 31, 2019, compared to ~~$647 thousand and $2.4~~$1.5 million for the three ~~and nine~~ months ended ~~September 30, 2016.~~March 31, 2018.

An age analysis of past due loans (including both accruing and non-accruing loans), segregated by class of loans, as of ~~September 30, 2017~~March 31, 2019 was as follows:



	Loans 30-89 Days Past Due		Loans 90 or More Days Past Due		Total Past Due Loans		Current Loans		Total Loans		Accruing Loans 90 or More Days Past Due
Commercial and industrial	$	24,572	$	15,675	$	40,247	$	5,328,024	$	5,368,271	$	7,377
Energy	10,151		1,766		11,917		1,547,156		1,559,073		1,221
Commercial real estate:
Buildings, land and other	22,223		12,580		34,803		4,533,825		4,568,628		2,273
Construction	6,173		410		6,583		1,237,984		1,244,567		—
Consumer real estate	7,331		2,207		9,538		1,118,214		1,127,752		1,794
Consumer and other	7,143		2,532		9,675		528,373		538,048		1,124
Total	$	77,593	$	35,170	$	112,763	$	14,293,576	$	14,406,339	$	13,789

Loans
30-89 Days
Past Due

Loans
90 or More
Days
Past Due

Total
Past Due
Loans

Current
Loans

Total
Loans

Accruing
Loans 90 or
More Days
Past Due
Commercial and industrial $ 26,415
$ 30,740
$ 57,155
$ 4,620,768
$ 4,677,923
$ 20,614
Energy 12,585
46,097
58,682
1,328,378
1,387,060
634
Commercial real estate:
Buildings, land and other 9,065
4,065
13,130
4,008,743
4,021,873
2,229
Construction —
2,331
2,331
1,079,898
1,082,229
2,331
Consumer real estate 7,671
2,107
9,778
1,004,693
1,014,471
835
Consumer and other 9,754
486
10,240
512,508
522,748
478
Total $ 65,490
$ 85,826
$ 151,316
$ 12,554,988
$ 12,706,304
$ 27,121

Impaired Loans. Impaired loans are set forth in the following table. No interest income was recognized on impaired loans subsequent to their classification as impaired.



	Unpaid Contractual Principal Balance		Recorded Investment With No Allowance		Recorded Investment With Allowance		Total Recorded Investment		Related Allowance
March 31, 2019
Commercial and industrial	$	15,281	$	3,554	$	10,647	$	14,201	$	6,698
Energy	66,754		6,342		39,131		45,473		8,996
Commercial real estate:
Buildings, land and other	27,491		12,236		14,086		26,322		2,855
Construction	430		410		—		410		—
Consumer real estate	1,285		1,285		—		1,285		—
Consumer and other	1,492		—		1,424		1,424		1,424
Total	$	112,733	$	23,827	$	65,288	$	89,115	$	19,973
December 31, 2018
Commercial and industrial	$	9,094	$	2,842	$	4,287	$	7,129	$	2,558
Energy	67,900		6,817		39,890		46,707		9,671
Commercial real estate:
Buildings, land and other	15,774		2,168		12,517		14,685		2,599
Construction	—		—		—		—		—
Consumer real estate	293		293		—		293		—
Consumer and other	1,475		—		1,407		1,407		1,407
Total	$	94,536	$	12,120	$	58,101	$	70,221	$	16,235

Unpaid Contractual
Principal
Balance

Recorded Investment
With No
Allowance

Recorded Investment
With
Allowance

Total
Recorded
Investment

Related
Allowance
September 30, 2017
Commercial and industrial $ 48,751
$ 31,065
$ 3,937
$ 35,002
$ 1,665
Energy 107,883
34,834
61,805
96,639
13,267
Commercial real estate:

Buildings, land and other 9,976
5,627
—
5,627
—
Construction —
—
—
—
—
Consumer real estate 1,214
1,214
—
1,214
—
Consumer and other —
—
—
—
—
Total $ 167,824
$ 72,740
$ 65,742
$ 138,482
$ 14,932

Unpaid Contractual
Principal
Balance Recorded Investment
With No
Allowance Recorded Investment
With
Allowance Total
Recorded
Investment Related
Allowance
December 31, 2016
Commercial and industrial $ 40,288
$ 19,862
$ 9,047
$ 28,909
$ 5,436
Energy 60,522
27,759
29,804
57,563
3,750
Commercial real estate:
Buildings, land and other 11,369
6,866
—
6,866
—
Construction —
—
—
—
—
Consumer real estate 977
655
—
655
—
Consumer and other 32
30
—
30
—
Total $ 113,188
$ 55,172
$ 38,851
$ 94,023
$ 9,186

The average recorded investment in impaired loans was as follows:



	Three Months Ended March 31,
	2019		2018
Commercial and industrial	$	10,665	$	29,496
Energy	46,090		99,657
Commercial real estate:
Buildings, land and other	20,504		8,009
Construction	205		—
Consumer real estate	789		1,321
Consumer and other	1,416		—
Total	$	79,669	$	138,483

Three Months Ended
September 30, Nine Months Ended
September 30,
2017 2016 2017
2016
Commercial and industrial $ 26,910
$ 26,921
$ 26,651
$ 25,365
Energy 76,008
47,003
72,055
57,309
Commercial real estate:
Buildings, land and other 5,553
8,904
6,106
20,444
Construction —
326
—
548
Consumer real estate 1,209
545
1,155
508
Consumer and other —
48
13
24
Total $ 109,680
$ 83,747
$ 105,980
$ 104,198

Troubled Debt Restructurings. Troubled debt restructurings during the ~~nine~~three months ended ~~September 30, 2017~~March 31, 2019 and ~~September 30, 2016~~March 31, 2018 are set forth in the following table.



	Three Months Ended March 31, 2019				Three Months Ended March 31, 2018
	Balance at Restructure		Balance at Period-End		Balance at Restructure		Balance at Period-End
Commercial and industrial	$	307	$	293	$	2,203	$	2,171
Energy	—		—		13,708		12,058
Commercial real estate:
Buildings, land and other	5,901		5,898		—		—
	$	6,208	$	6,191	$	15,911	$	14,229

Nine Months Ended
September 30, 2017 Nine Months Ended
September 30, 2016

Balance at
Restructure

Balance at
Period-End

Balance at
Restructure

Balance at
Period-End
Commercial and industrial $ 4,026
$ 3,875
$ 510
$ 505
Energy 56,097
55,023
73,977
31,918
Commercial real estate:
Buildings, land and other —
—
1,455
1,455
Construction —
—
243
221
$ 60,123
$ 58,898
$ 76,185
$ 34,099

Loan modifications are typically related to extending amortization periods, converting loans to interest only for a limited period of time, deferral of interest payments, waiver of certain covenants, consolidating notes and/or reducing collateral or interest rates. The modifications during the reported periods did not significantly impact our determination of the allowance for loan losses. As

Additional information related to restructured loans as of September 30, 2017, there was one loan totaling $43.1 million that was restructured during the third quarter of 2017 that was in excess of 90 days past due, however, the underlying terms of the modification allowor for the ~~deferral of payments. During the nine~~three months ended ~~September 30, 2017, we recognized charge-offs totaling $10.0 million related to loans restructured during~~March 31, 2019 and March 31, 2018 is set forth in the third and fourth quarters of 2016. During the nine months ended September 30, 2016, we recognized a charge-off of $9.5 million related to a loan restructured during the first quarter of 2016. The loan was subsequently sold with proceeds from the sale totaling $30.5 million.following table.



	March 31, 2019		March 31, 2018
Restructured loans past due in excess of 90 days at period-end:
Number of loans	4		—
Dollar amount of loans	$	2,367	$	—
Restructured loans on non-accrual status at period end	2,162		2,171
Charge-offs of restructured loans:
Recognized in connection with restructuring	—		—
Recognized on previously restructured loans	—		1,650

Credit Quality Indicators. As part of the on-going monitoring of the credit quality of our loan portfolio, management tracks certain credit quality indicators including trends related to (i) the weighted-average risk grade of commercial loans, (ii) the level of classified commercial loans, (iii) the delinquency status of consumer loans (see details above), (iv) net charge-offs, (v) non-performing loans (see details above) and (vi) the general economic conditions in the State of Texas.

We utilize a risk grading matrix to assign a risk grade to each of our commercial loans. Loans are graded on a scale of 1 to 14. A description of the general characteristics of the 14 risk grades is set forth in our ~~2016~~2018 Form 10-K. In monitoring credit quality

trends in the context of assessing the appropriate level of the allowance for loan losses, we monitor portfolio credit quality by the weighted-average risk grade of each class of commercial loan. Individual relationship managers review updated financial information for all pass grade loans to reassess the risk grade on at least an annual basis. When a loan has a risk grade of 9, it is still considered a pass grade loan; however, it is considered to be on management’s “watch list,” where a significant risk-modifying action is anticipated in the near term. When a loan has a risk grade of 10 or higher, a special assets officer monitors the loan on an on-going basis.

The following tables present weighted-average risk grades for all commercial loans by class.



	March 31, 2019			December 31, 2018
	Weighted Average Risk Grade	Loans		Weighted Average Risk Grade	Loans
Commercial and industrial:
Risk grades 1-8	6.08	$	5,024,023	6.12	$	4,862,275
Risk grade 9	9.00	182,286		9.00	112,431
Risk grade 10	10.00	51,968		10.00	58,328
Risk grade 11	11.00	93,960		11.00	69,684
Risk grade 12	12.00	9,336		12.00	6,681
Risk grade 13	13.00	6,698		13.00	2,558
Total	6.33	$	5,368,271	6.30	$	5,111,957
Energy
Risk grades 1-8	5.77	$	1,358,199	5.76	$	1,451,673
Risk grade 9	9.00	81,621		9.00	35,565
Risk grade 10	10.00	35,056		10.00	43,001
Risk grade 11	11.00	38,524		11.00	25,427
Risk grade 12	12.00	36,677		12.00	37,261
Risk grade 13	13.00	8,996		13.00	9,671
Total	6.35	$	1,559,073	6.22	$	1,602,598
Commercial real estate:
Buildings, land and other
Risk grades 1-8	6.78	$	4,280,730	6.76	$	4,143,264
Risk grade 9	9.00	111,496		9.00	109,660
Risk grade 10	10.00	62,315		10.00	62,353
Risk grade 11	11.00	87,327		11.00	98,176
Risk grade 12	12.00	23,905		12.00	12,669
Risk grade 13	13.00	2,855		13.00	2,599
Total	6.99	$	4,568,628	6.98	$	4,428,721
Construction
Risk grades 1-8	7.15	$	1,176,243	7.13	$	1,177,260
Risk grade 9	9.00	49,728		9.00	60,754
Risk grade 10	10.00	13,869		10.00	24,877
Risk grade 11	11.00	4,317		11.00	4,826
Risk grade 12	12.00	410		12.00	—
Risk grade 13	13.00	—		13.00	—
Total	7.27	$	1,244,567	7.29	$	1,267,717

September 30, 2017 December 31, 2016
Weighted
Average
Risk Grade Loans Weighted
Average
Risk Grade Loans
Commercial and industrial:
Risk grades 1-8 6.01
$ 4,236,670
6.01
$ 3,989,722
Risk grade 9 9.00
201,635
9.00
106,988
Risk grade 10 10.00
89,126
10.00
115,420
Risk grade 11 11.00
113,253
11.00
100,245
Risk grade 12 12.00
35,574
12.00
25,939
Risk grade 13 13.00
1,665
13.00
5,686
Total 6.38
$ 4,677,923
6.35
$ 4,344,000
Energy
Risk grades 1-8 6.19
$ 1,082,349
6.34
$ 854,688
Risk grade 9 9.00
46,285
9.00
78,524
Risk grade 10 10.00
67,694
10.00
150,872
Risk grade 11 11.00
94,015
11.00
244,406
Risk grade 12 12.00
83,450
12.00
53,821
Risk grade 13 13.00
13,267
13.00
3,750
Total 7.21
$ 1,387,060
7.95
$ 1,386,061
Commercial real estate:

Buildings, land and other
Risk grades 1-8 6.69
$ 3,720,068
6.67
$ 3,463,064
Risk grade 9 9.00
115,196
9.00
109,110
Risk grade 10 10.00
110,647
10.00
145,067
Risk grade 11 11.00
69,189
11.00
66,396
Risk grade 12 12.00
6,773
12.00
8,550
Risk grade 13 13.00
—
13.00
—
Total 6.93
$ 4,021,873
6.95
$ 3,792,187
Construction
Risk grades 1-8 7.14
$ 1,058,847
6.97
$ 1,023,194
Risk grade 9 9.00
18,106
9.00
15,829
Risk grade 10 10.00
3,768
10.00
2,889
Risk grade 11 11.00
1,508
11.00
1,349
Risk grade 12 12.00
—
12.00
—
Risk grade 13 13.00
—
13.00
—
Total 7.19
$ 1,082,229
7.01
$ 1,043,261

Net (charge-offs)/recoveries, segregated by class of loans, were as follows:



	Three Months Ended March 31,
	2019			2018
Commercial and industrial	$	(1,938	)	$	(7,675	)
Energy	47			(2,849		)
Commercial real estate:
Buildings, land and other	27			81
Construction	3			2
Consumer real estate	(1,689		)	(526		)
Consumer and other	(3,235		)	(1,457		)
Total	$	(6,785	)	$	(12,424	)

Three Months Ended
September 30, Nine Months Ended
September 30,
2017 2016 2017 2016
Commercial and industrial $ (4,565 ) $ (3,079 ) $ (12,155 ) $ (8,177 )
Energy 451
(865 ) (10,010 ) (18,623 )
Commercial real estate:
Buildings, land and other 266
259
768
801
Construction 2
9
8
18
Consumer real estate (629 ) (195 ) (422 ) (22 )
Consumer and other (1,760 ) (1,115 ) (4,289 ) (2,817 )
Total $ (6,235 ) $ (4,986 ) $ (26,100 ) $ (28,820 )

In assessing the general economic conditions in the State of Texas, management monitors and tracks the Texas Leading Index (“TLI”), which is produced by the Federal Reserve Bank of Dallas. The TLI, the components of which are more fully described in our ~~2016~~2018 Form 10-K, totaled ~~124.6~~127.3 at ~~August~~March 31, ~~2017 (most recent date available)~~2019 and ~~123.1~~125.6 at December 31, ~~2016.~~2018. A higher TLI value implies more favorable economic conditions.

Allowance for Loan Losses. The allowance for loan losses is a reserve established through a provision for loan losses charged to expense, which represents management’s best estimate of inherent losses that have been incurred within the existing portfolio of loans. The allowance, in the judgment of management, is necessary to reserve for estimated loan losses and risks inherent in the loan portfolio. Our allowance for loan loss methodology, which is more fully described in our ~~2016~~2018 Form 10-K, follows the accounting guidance set forth in U.S. generally accepted accounting principles and the Interagency Policy Statement on the Allowance for Loan and Lease Losses, which was jointly issued by U.S. bank regulatory agencies. The level of the allowance reflects management’s continuing evaluation of industry concentrations, specific credit risks, loan loss and recovery experience, current loan portfolio quality, present economic, political and regulatory conditions and unidentified losses inherent in the current loan portfolio. Portions of the allowance may be allocated for specific credits; however, the entire allowance is available for any credit that, in management’s judgment, should be charged off.

The following table presents details of the allowance for loan losses allocated to each portfolio segment as of ~~September 30, 2017~~March 31, 2019 and December 31, ~~2016~~2018 and detailed on the basis of the impairment evaluation methodology we used:



	Commercial and Industrial		Energy		Commercial Real Estate		Consumer Real Estate		Consumer and Other			Total
March 31, 2019
Historical valuation allowances	$	31,431	$	9,293	$	20,576	$	2,571	$	7,699		$	71,570
Specific valuation allowances	6,698		8,996		2,855		—		1,424			19,973
General valuation allowances	10,870		4,200		3,812		1,654		(84		)	20,452
Macroeconomic valuation allowances	9,572		2,854		9,212		1,436		1,281			24,355
Total	$	58,571	$	25,343	$	36,455	$	5,661	$	10,320		$	136,350
Allocated to loans:
Individually evaluated	$	6,698	$	8,996	$	2,855	$	—	$	1,424		$	19,973
Collectively evaluated	51,873		16,347		33,600		5,661		8,896			116,377
Total	$	58,571	$	25,343	$	36,455	$	5,661	$	10,320		$	136,350
December 31, 2018
Historical valuation allowances	$	25,351	$	9,697	$	20,817	$	2,688	$	6,845		$	65,398
Specific valuation allowances	2,558		9,671		2,599		—		1,407			16,235
General valuation allowances	10,062		6,014		4,366		1,671		(13		)	22,100
Macroeconomic valuation allowances	10,609		3,670		10,995		1,744		1,381			28,399
Total	$	48,580	$	29,052	$	38,777	$	6,103	$	9,620		$	132,132
Allocated to loans:
Individually evaluated	$	2,558	$	9,671	$	2,599	$	—	$	1,407		$	16,235
Collectively evaluated	46,022		19,381		36,178		6,103		8,213			115,897
Total	$	48,580	$	29,052	$	38,777	$	6,103	$	9,620		$	132,132

Commercial
and
Industrial
Energy
Commercial
Real Estate

Consumer
Real Estate

Consumer
and Other
Total
September 30, 2017
Historical valuation allowances $ 27,190
$ 21,900
$ 18,304
$ 2,443
$ 5,491
$ 75,328
Specific valuation allowances 1,665
13,267
—
—
—
14,932
General valuation allowances 7,397
4,677
4,841
2,040
163
19,118
Macroeconomic valuation allowances 12,185
12,069
14,930
2,392
3,349
44,925
Total $ 48,437
$ 51,913
$ 38,075
$ 6,875
$ 9,003
$ 154,303
Allocated to loans:
Individually evaluated $ 1,665
$ 13,267
$ —
$ —
$ —
$ 14,932
Collectively evaluated 46,772
38,646
38,075
6,875
9,003
139,371
Total $ 48,437
$ 51,913
$ 38,075
$ 6,875
$ 9,003
$ 154,303
December 31, 2016
Historical valuation allowances $ 33,251
$ 34,626
$ 16,976
$ 2,225
$ 4,585
$ 91,663
Specific valuation allowances 5,436
3,750
—
—
—
9,186
General valuation allowances 6,708
3,769
5,004
1,506
(144 ) 16,843
Macroeconomic valuation allowances 7,520
18,508
8,233
507
585
35,353
Total $ 52,915
$ 60,653
$ 30,213
$ 4,238
$ 5,026
$ 153,045
Allocated to loans:
Individually evaluated $ 5,436
$ 3,750
$ —
$ —
$ —
$ 9,186
Collectively evaluated 47,479
56,903
30,213
4,238
5,026
143,859
Total $ 52,915
$ 60,653
$ 30,213
$ 4,238
$ 5,026
$ 153,045

Our recorded investment in loans as of ~~September 30, 2017~~March 31, 2019 and December 31, ~~2016~~2018 related to each balance in the allowance for loan losses by portfolio segment and detailed on the basis of the impairment methodology we used was as follows:



	Commercial and Industrial		Energy		Commercial Real Estate		Consumer Real Estate		Consumer and Other		Total
March 31, 2019
Individually evaluated	$	14,201	$	45,473	$	26,732	$	1,285	$	1,424	$	89,115
Collectively evaluated	5,354,070		1,513,600		5,786,463		1,126,467		536,624		14,317,224
Total	$	5,368,271	$	1,559,073	$	5,813,195	$	1,127,752	$	538,048	$	14,406,339
December 31, 2018
Individually evaluated	$	7,129	$	46,707	$	14,685	$	293	$	1,407	$	70,221
Collectively evaluated	5,104,828		1,555,891		5,681,753		1,118,697		568,343		14,029,512
Total	$	5,111,957	$	1,602,598	$	5,696,438	$	1,118,990	$	569,750	$	14,099,733

Commercial
and
Industrial
Energy Commercial
Real Estate Consumer
Real Estate Consumer
and Other Total
September 30, 2017
Individually evaluated $ 35,002
$ 96,639
$ 5,627
$ 1,214
$ —
$ 138,482
Collectively evaluated 4,642,921
1,290,421
5,098,475
1,013,257
522,748
12,567,822
Total $ 4,677,923
$ 1,387,060
$ 5,104,102
$ 1,014,471
$ 522,748
$ 12,706,304
December 31, 2016
Individually evaluated $ 28,909
$ 57,563
$ 6,866
$ 655
$ 30
$ 94,023
Collectively evaluated 4,315,091
1,328,498
4,828,582
936,130
473,068
11,881,369
Total $ 4,344,000
$ 1,386,061
$ 4,835,448
$ 936,785
$ 473,098
$ 11,975,392

The following table details activity in the allowance for loan losses by portfolio segment for the three ~~and nine~~ months ended ~~September 30, 2017~~March 31, 2019 and ~~2016~~2018. Allocation of a portion of the allowance to one category of loans does not preclude its availability to absorb losses in other categories.



	Commercial and Industrial			Energy			Commercial Real Estate			Consumer Real Estate			Consumer and Other			Total
Three months ended:
March 31, 2019
Beginning balance	$	48,580		$	29,052		$	38,777		$	6,103		$	9,620		$	132,132
Provision for loan losses	11,929			(3,756		)	(2,352		)	1,247			3,935			11,003
Charge-offs	(2,688		)	—			(60		)	(1,778		)	(5,697		)	(10,223		)
Recoveries	750			47			90			89			2,462			3,438
Net charge-offs	(1,938		)	47			30			(1,689		)	(3,235		)	(6,785		)
Ending balance	$	58,571		$	25,343		$	36,455		$	5,661		$	10,320		$	136,350
March 31, 2018
Beginning balance	$	59,614		$	51,528		$	30,948		$	5,657		$	7,617		$	155,364
Provision for loan losses	5,794			(9,640		)	7,443			1,218			2,130			6,945
Charge-offs	(9,252		)	(2,850		)	(5		)	(719		)	(3,972		)	(16,798		)
Recoveries	1,577			1			88			193			2,515			4,374
Net charge-offs	(7,675		)	(2,849		)	83			(526		)	(1,457		)	(12,424		)
Ending balance	$	57,733		$	39,039		$	38,474		$	6,349		$	8,290		$	149,885

Commercial
and
Industrial
Energy
Commercial
Real Estate

Consumer
Real Estate

Consumer
and Other
Total
Three months ended:
September 30, 2017
Beginning balance $ 48,906
$ 54,277
$ 33,002
$ 5,535
$ 7,838
$ 149,558
Provision for loan losses 4,096
(2,815 ) 4,805
1,969
2,925
10,980
Charge-offs (5,468 ) —
—
(766 ) (4,120 ) (10,354 )
Recoveries 903
451
268
137
2,360
4,119
Net charge-offs (4,565 ) 451
268
(629 ) (1,760 ) (6,235 )
Ending balance $ 48,437
$ 51,913
$ 38,075
$ 6,875
$ 9,003
$ 154,303
September 30, 2016
Beginning balance $ 47,578
$ 66,339
$ 27,063
$ 3,935
$ 4,799
$ 149,714
Provision for loan losses 4,632
(3,231 ) 1,886
427
1,331
5,045
Charge-offs (4,036 ) (884 ) (9 ) (287 ) (3,300 ) (8,516 )
Recoveries 957
19
277
92
2,185
3,530
Net charge-offs (3,079 ) (865 ) 268
(195 ) (1,115 ) (4,986 )
Ending balance $ 49,131
$ 62,243
$ 29,217
$ 4,167
$ 5,015
$ 149,773

Nine months ended:
September 30, 2017
Beginning balance $ 52,915
$ 60,653
$ 30,213
$ 4,238
$ 5,026
$ 153,045
Provision for loan losses 7,677
1,270
7,086
3,059
8,266
27,358
Charge-offs (14,574 ) (10,595 ) (14 ) (779 ) (11,291 ) (37,253 )
Recoveries 2,419
585
790
357
7,002
11,153
Net charge-offs (12,155 ) (10,010 ) 776
(422 ) (4,289 ) (26,100 )
Ending balance $ 48,437
$ 51,913
$ 38,075
$ 6,875
$ 9,003
$ 154,303
September 30, 2016
Beginning balance $ 42,993
$ 54,696
$ 24,313
$ 4,659
$ 9,198
$ 135,859
Provision for loan losses 14,315
26,170
4,085
(470 ) (1,366 ) 42,734
Charge-offs (10,754 ) (18,644 ) (56 ) (464 ) (9,276 ) (39,194 )
Recoveries 2,577
21
875
442
6,459
10,374
Net charge-offs (8,177 ) (18,623 ) 819
(22 ) (2,817 ) (28,820 )
Ending balance $ 49,131
$ 62,243
$ 29,217
$ 4,167
$ 5,015
$ 149,773

Note 4 - Goodwill and Other Intangible Assets

Goodwill and other intangible assets are presented in the table below.


	September 30, 2017		December 31, 2016		March 31, 2019		December 31, 2018
Goodwill	$	654,952	$	654,952	$	654,952	$	654,952
Other intangible assets:
Core deposits	$	4,340	$	5,298	$	2,705	$	2,959
Customer relationships	1,086		1,410		606		672
Non-compete agreements	49		68		13		18
	$	5,475	$	6,776	$	3,324	$	3,649

The estimated aggregate future amortization expense for intangible assets remaining as of ~~September 30, 2017~~March 31, 2019 is as follows:



Remainder of 2019	$	842
2020	919
2021	697
2022	481
2023	283
Thereafter	102
	$	3,324

Remainder of 2017 $ 402
2018 1,424
2019 1,167
2020 918
2021 697
Thereafter 867
$ 5,475

Note 5 - Deposits

Deposits were as follows:



	March 31, 2019		Percentage of Total		December 31, 2018		Percentage of Total
Non-interest-bearing demand deposits:
Commercial and individual	$	9,621,070	36.6	%	$	10,305,850	37.9	%
Correspondent banks	197,784		0.7		235,748		0.9
Public funds	310,054		1.2		455,896		1.7
Total non-interest-bearing demand deposits	10,128,908		38.5		10,997,494		40.5
Interest-bearing deposits:
Private accounts:
Savings and interest checking	6,975,228		26.5		6,977,813		25.7
Money market accounts	7,755,793		29.5		7,777,470		28.6
Time accounts of $100,000 or more	592,708		2.3		526,789		2.0
Time accounts under $100,000	340,405		1.3		331,511		1.2
Total private accounts	15,664,134		59.6		15,613,583		57.5
Public funds:
Savings and interest checking	428,420		1.6		473,754		1.8
Money market accounts	69,245		0.3		59,953		0.2
Time accounts of $100,000 or more	4,068		—		4,332		—
Time accounts under $100,000	88		—		88		—
Total public funds	501,821		1.9		538,127		2.0
Total interest-bearing deposits	16,165,955		61.5		16,151,710		59.5
Total deposits	$	26,294,863	100.0	%	$	27,149,204	100.0	%

September 30,
2017
Percentage
of Total
December 31,
2016
Percentage
of Total
Non-interest-bearing demand deposits:
Commercial and individual $ 10,466,844
39.6 % $ 9,670,989
37.5 %
Correspondent banks 226,313
0.9
280,751
1.1
Public funds 481,094
1.8
561,629
2.2
Total non-interest-bearing demand deposits 11,174,251
42.3
10,513,369
40.8
Interest-bearing deposits:
Private accounts:
Savings and interest checking 6,449,079
24.4
6,436,065
24.9
Money market accounts 7,607,675
28.8
7,486,431
29.0
Time accounts of $100,000 or more 454,096
1.7
460,028
1.8
Time accounts under $100,000 323,748
1.3
338,714
1.3
Total private accounts 14,834,598
56.2
14,721,238
57.0
Public funds:
Savings and interest checking 312,430
1.2
446,872
1.7
Money market accounts 68,018
0.3
113,669
0.4
Time accounts of $100,000 or more 13,462
—
15,748
0.1
Time accounts under $100,000 510
—
679
—
Total public funds 394,420
1.5
576,968
2.2
Total interest-bearing deposits 15,229,018
57.7
15,298,206
59.2
Total deposits $ 26,403,269
100.0 % $ 25,811,575
100.0 %

The following table presents additional information about our deposits:



	March 31, 2019		December 31, 2018
Deposits from foreign sources (primarily Mexico)	$	761,685	$	752,658
Deposits not covered by deposit insurance	12,116,569		13,111,210

September 30,
2017 December 31,
2016
Deposits from foreign sources (primarily Mexico) $ 756,326
$ 776,003
Deposits not covered by deposit insurance 13,255,165
12,889,047

~~Note 6 - Borrowed Funds~~

~~Subordinated Notes Payable.~~ In March 2017, we issued $100 million of 4.50% subordinated notes that mature on March 17, 2027. The notes, which qualify as Tier 2 capital for Cullen/Frost, bear interest at the rate of 4.50% per annum, payable semi-annually on each March 17 and September 17. The notes are unsecured and subordinated in right of payment to the payment of our existing and future senior indebtedness and structurally subordinated to all existing and future indebtedness of our subsidiaries. Unamortized debt issuance costs related to these notes, totaled approximately $1.5 million at September 30, 2017. Proceeds from sale of the notes were used for general corporate purposes.

Our $100 million of 5.75% fixed-to-floating rate subordinated notes matured and were redeemed on February 15, 2017. See Note 8 - Borrowed Funds in our 2016 Form 10-K for additional information about these notes.

Note 76 - Commitments and Contingencies

Financial Instruments with Off-Balance-Sheet Risk. In the normal course of business, we enter into various transactions, which, in accordance with generally accepted accounting principles are not included in our consolidated balance sheets. We enter into these transactions to meet the financing needs of our customers. As more fully discussed in our ~~2016~~2018 Form 10-K, these transactions include commitments to extend credit and standby letters of credit, which involve, to varying degrees, elements of credit risk and interest rate risk in excess of the amounts recognized in the consolidated balance sheets. We minimize our exposure to loss under these commitments by subjecting them to credit approval and monitoring procedures.

Financial instruments with off-balance-sheet risk were as follows:



	March 31, 2019		December 31, 2018
Commitments to extend credit	$	8,522,497	$	8,369,721
Standby letters of credit	275,923		271,575
Deferred standby letter of credit fees	1,816		2,069

September 30,
2017 December 31,
2016
Commitments to extend credit $ 7,939,438
$ 7,476,420
Standby letters of credit 236,996
239,482
Deferred standby letter of credit fees 1,860
2,054

Lease Commitments. We lease certain office facilities and office equipment under operating leases. Rent expense for all operating leases totaled ~~$7.7~~$8.6 million and ~~$23.0~~$8.2 million during the three ~~and nine~~ months ended ~~September 30, 2017~~March 31, 2019 and ~~$7.5~~March 31, 2018, respectively. On January 1, 2019, we adopted a new accounting standard which required the recognition of our operating leases on our balance sheet. See Note 1 - Significant Accounting Policies. As of March 31, 2019, right-of-use lease assets and related lease liabilities totaled $165.5 million and ~~$22.0~~$171.8 million, respectively, and are included with premises and equipment and accrued interest payable and other liabilities, respectively, on our accompanying consolidated balance sheet. Furthermore, during the ~~three~~second quarter of 2019, we expect to recognize an additional right-of-use lessee lease asset and ~~nine months ended September 30, 2016.~~related lessee lease liability totaling approximately $110.0 million to $140.0 million in connection with the commencement of the lease of our new corporate headquarters facility in downtown San Antonio. There has been no significant change in our expected future minimum lease payments since December 31, ~~2016~~.2018. See the ~~2016~~2018 Form 10-K for information regarding these commitments.

~~Litigation~~.Litigation. We are subject to various claims and legal actions that have arisen in the course of conducting business. Management does not expect the ultimate disposition of these matters to have a material adverse impact on our financial statements.

Note 87 - Capital and Regulatory Matters

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 amounts and classifications are also subject to qualitative judgments by regulators about components, risk weighting and other factors.

Cullen/Frost’s and Frost Bank’s Common Equity Tier 1 capital includes common stock and related paid-in capital, net of treasury stock, and retained earnings. In connection with the adoption of the Basel III Capital Rules, we elected to opt-out of the requirement to include most components of accumulated other comprehensive income in Common Equity Tier 1. Common Equity Tier 1 for both Cullen/Frost and Frost Bank is reduced by goodwill and other intangible assets, net of associated deferred tax liabilities, and subject to transition provisions. Frost Bank's Common Equity Tier 1 is also reduced by its equity investment in its financial subsidiary, Frost Insurance Agency (“FIA”).

Tier 1 capital includes Common Equity Tier 1 capital and additional Tier 1 capital. For Cullen/Frost, additional Tier 1 capital at ~~September 30, 2017~~March 31, 2019 and December 31, ~~2016~~2018 includes $144.5 million of 5.375% non-cumulative perpetual preferred stock. Frost Bank did not have any additional Tier 1 capital beyond Common Equity Tier 1 at ~~September 30, 2017~~March 31, 2019 or December 31, ~~2016.~~2018.

Total capital includes Tier 1 capital and Tier 2 capital. Tier 2 capital for both Cullen/Frost and Frost Bank includes a permissible portion of the allowance for loan losses. Tier 2 capital for Cullen/Frost also includes $100.0 million of qualified subordinated debt ~~at September 30, 2017~~ and $133.0 million of trust preferred securities at both ~~September 30, 2017~~March 31, 2019 and December 31, ~~2016.~~2018.

The following ~~table presents~~tables present actual and required capital ratios as of March 31, 2019 and December 31, 2018 for Cullen/Frost and Frost Bank under the Basel III Capital Rules. The Basel III Capital Rules became fully phased-in on January 1, 2019. The minimum required capital amounts presented as of December 31, 2018 include the minimum required capital levels applicable as of ~~September 30, 2017 and December 31, 2016 based on the phase-in provisions of the Basel III Capital Rules and~~that date as well as the minimum required capital levels as of January 1, 2019 when the Basel III Capital Rules ~~have been~~became fully phased-in. Capital levels required to be considered well capitalized are based upon prompt corrective action regulations, as amended to reflect the changes under the Basel III Capital Rules. See the ~~2016~~2018 Form 10-K for a more detailed discussion of the Basel III Capital Rules. After a review of risk-weight classifications during the first quarter of 2019, risk-weightings for certain loans were reclassified. Amounts reported as of December 31, 2018 have been revised to reflect these reclassifications.



	Actual				Minimum Capital Required - Basel III				Required to be Considered Well Capitalized
	Capital Amount		Ratio		Capital Amount		Ratio		Capital Amount		Ratio
March 31, 2019
Common Equity Tier 1 to Risk-Weighted Assets
Cullen/Frost	$	2,710,546	12.34	%	$	1,537,237	7.00	%	$	1,427,434	6.50	%
Frost Bank	2,784,786		12.71		1,533,226		7.00		1,423,709		6.50
Tier 1 Capital to Risk-Weighted Assets
Cullen/Frost	2,855,032		13.00		1,866,645		8.50		1,756,842		8.00
Frost Bank	2,784,786		12.71		1,861,774		8.50		1,752,258		8.00
Total Capital to Risk-Weighted Assets
Cullen/Frost	3,224,882		14.68		2,305,856		10.50		2,196,053		10.00
Frost Bank	2,921,636		13.34		2,299,838		10.50		2,190,322		10.00
Leverage Ratio
Cullen/Frost	2,855,032		9.35		1,221,268		4.00		1,526,584		5.00
Frost Bank	2,784,786		9.13		1,220,083		4.00		1,525,104		5.00


	Actual				Minimum Capital Required - Basel III Phase-In Schedule				Minimum Capital Required - Basel III Fully Phased-In				Required to be Considered Well Capitalized				Actual				Minimum Capital Required - Basel III Phase-In Schedule				Minimum Capital Required - Basel III Fully Phased-In				Required to be Considered Well Capitalized
	Capital Amount		Ratio		Capital Amount		Ratio		Capital Amount		Ratio		Capital Amount		Ratio		Capital Amount		Ratio		Capital Amount		Ratio		Capital Amount		Ratio		Capital Amount		Ratio
September 30, 2017
December 31, 2018
Common Equity Tier 1 to Risk-Weighted Assets
Cullen/Frost	$	2,345,433	12.38	%	$	1,089,289	5.75	%	$	1,326,014	7.00	%	$	1,231,370	6.50	%	$	2,642,475	12.27	%	$	1,372,573	6.375	%	$	1,507,139	7.00	%	$	1,358,171	6.50	%
Frost Bank	2,461,004		13.02		1,086,527		5.75		1,322,652		7.00		1,228,248		6.50		2,743,973		12.78		1,368,701		6.375		1,502,887		7.00		1,354,222		6.50
Tier 1 Capital to Risk-Weighted Assets
Cullen/Frost	2,489,919		13.14		1,373,451		7.25		1,610,160		8.50		1,515,532		8.00		2,786,961		12.94		1,695,532		7.875		1,830,098		8.50		1,671,595		8.00
Frost Bank	2,461,004		13.02		1,369,969		7.25		1,606,077		8.50		1,511,690		8.00		2,743,973		12.78		1,690,748		7.875		1,824,934		8.50		1,666,735		8.00
Total Capital to Risk-Weighted Assets
Cullen/Frost	2,877,222		15.19		1,752,334		9.25		1,989,021		10.50		1,894,415		10.00		3,152,593		14.64		2,126,143		9.875		2,260,709		10.50		2,089,494		10.00
Frost Bank	2,615,307		13.84		1,747,891		9.25		1,983,978		10.50		1,889,612		10.00		2,876,605		13.40		2,120,144		9.875		2,254,331		10.50		2,083,419		10.00
Leverage Ratio
Cullen/Frost	2,489,919		8.39		1,187,616		4.00		1,187,573		4.00		1,484,521		5.00		2,786,961		9.06		1,231,028		4.00		1,231,028		4.00		1,538,785		5.00
Frost Bank	2,461,004		8.29		1,186,763		4.00		1,186,719		4.00		1,483,453		5.00		2,743,973		8.93		1,229,650		4.00		1,229,650		4.00		1,537,062		5.00
December 31, 2016
Common Equity Tier 1 to Risk-Weighted Assets
Cullen/Frost	$	2,239,186	12.52	%	$	916,360	5.125	%	$	1,251,425	7.00	%	$	1,162,213	6.50	%
Frost Bank	2,296,480		12.88		913,460		5.125		1,247,463		7.00		1,158,535		6.50
Tier 1 Capital to Risk-Weighted Assets
Cullen/Frost	2,383,672		13.33		1,184,563		6.625		1,519,587		8.50		1,430,416		8.00
Frost Bank	2,296,480		12.88		1,180,814		6.625		1,514,776		8.50		1,425,889		8.00
Total Capital to Risk-Weighted Assets
Cullen/Frost	2,669,717		14.93		1,542,168		8.625		1,877,137		10.50		1,788,020		10.00
Frost Bank	2,449,525		13.74		1,537,286		8.625		1,871,194		10.50		1,782,361		10.00
Leverage Ratio
Cullen/Frost	2,383,672		8.14		1,171,682		4.00		1,171,573		4.00		1,464,602		5.00
Frost Bank	2,296,480		7.85		1,170,249		4.00		1,170,141		4.00		1,462,812		5.00

As of ~~September 30, 2017~~,March 31, 2019, capital levels at Cullen/Frost and Frost Bank exceed all capital adequacy requirements under the fully phased-in Basel III Capital ~~Rules on a fully phased-in basis.~~Rules. Based on the ratios presented above, capital levels as of ~~September 30, 2017~~March 31, 2019 at Cullen/Frost and Frost Bank exceed the minimum levels necessary to be considered “well capitalized.”

Cullen/Frost and Frost Bank are subject to the regulatory capital requirements administered by the Federal Reserve Board and, for Frost Bank, the Federal Deposit Insurance Corporation (“FDIC”). Regulatory authorities can initiate certain mandatory actions if Cullen/Frost or Frost Bank fail to meet the minimum capital requirements, which could have a direct material effect on our financial statements. Management believes, as of ~~September 30, 2017~~March 31, 2019, that Cullen/Frost and Frost Bank meet all capital adequacy requirements to which they are subject.

repurchase shares of our common stock over a ~~two-year~~two year period from time to time at various prices in the open market or through private transactions. ~~During~~No shares were repurchased under this plan during the ~~three months ended September 30, 2017,~~first quarter 2019 while we repurchased ~~1,134,966~~1,027,292 shares ~~under the plan at~~ at a total cost of $100.0 ~~million.~~million during the fourth quarter of 2018. Under the Basel III Capital Rules, Cullen/Frost may not repurchase its common stock (or repurchase or redeem any of its preferred stock or subordinated notes) without the prior approval of the Federal Reserve Board.

Dividend Restrictions. In the ordinary course of business, Cullen/Frost is dependent upon dividends from Frost Bank to provide funds for the payment of dividends to shareholders and to provide for other cash ~~requirements.~~requirements, including to repurchase its common stock. Banking regulations may limit the amount of dividends that may be paid. Approval by regulatory authorities is required if the effect of dividends declared would cause the regulatory capital of Frost Bank to fall below specified minimum levels. Approval is also required if dividends declared exceed the net profits for that year combined with the retained net profits for the preceding two years. Under the foregoing dividend restrictions and while maintaining its “well capitalized” status, at ~~September 30, 2017,~~March 31, 2019, Frost Bank could pay aggregate dividends of up to ~~$480.2~~$521.5 million to Cullen/Frost without prior regulatory approval.

Under the terms of the junior subordinated deferrable interest debentures that Cullen/Frost has issued to Cullen/Frost Capital Trust II and WNB Capital Trust I, Cullen/Frost has the right at any time during the term of the debentures to defer the payment of interest at any time or from time to time for an extension period not exceeding 20 consecutive quarterly periods with respect to each extension period. In the event that we have elected to defer interest on the debentures, we may not, with certain exceptions, declare or pay any dividends or distributions on our capital stock or purchase or acquire any of our capital stock.

Under the terms of our Series A Preferred Stock, in the event that we do not declare and pay dividends on our Series A Preferred Stock for the most recent dividend period, we may not, with certain exceptions, declare or pay dividends on, or purchase, redeem or otherwise acquire, shares of our common stock or any of our securities that rank junior to our Series A Preferred Stock.

Note 98 - Derivative Financial Instruments

The fair value of derivative positions outstanding is included in accrued interest receivable and other assets and accrued interest payable and other liabilities in the accompanying consolidated balance sheets and in the net change in each of these financial statement line items in the accompanying consolidated statements of cash flows.

Interest Rate Derivatives. We utilize interest rate swaps, caps and floors to mitigate exposure to interest rate risk and to facilitate the needs of our customers. Our objectives for utilizing these derivative instruments are described in our ~~2016~~2018 Form 10-K.

The notional amounts and estimated fair values of interest rate derivative contracts are presented in the following table. The fair values of interest rate derivative contracts are estimated utilizing internal valuation models with observable market data inputs, or as determined by the Chicago Mercantile Exchange (“CME”) for centrally cleared derivative contracts. ~~Beginning in 2017,~~ CME rules legally characterize variation margin payments for centrally cleared derivatives as settlements of the derivatives' exposure rather than collateral. As a result, the variation margin payment and the related derivative instruments are considered a single unit of account for accounting and financial reporting purposes. Variation margin, as determined by the CME, is settled daily. As a result, derivative contracts that clear through the CME have an estimated fair value of zero as of ~~September 30, 2017.~~March 31, 2019 and December 31, 2018.



	March 31, 2019					December 31, 2018
	Notional Amount		Estimated Fair Value			Notional Amount		Estimated Fair Value
Derivatives designated as hedges of fair value:
Financial institution counterparties:
Loan/lease interest rate swaps – assets	$	10,642	$	141		$	10,941	$	207
Loan/lease interest rate swaps – liabilities	3,538		(185		)	3,885		(199		)
Non-hedging interest rate derivatives:
Financial institution counterparties:
Loan/lease interest rate swaps – assets	363,454		1,343			496,887		2,384
Loan/lease interest rate swaps – liabilities	748,152		(12,868		)	691,143		(8,921		)
Loan/lease interest rate caps – assets	143,084		688			122,791		509
Customer counterparties:
Loan/lease interest rate swaps – assets	764,546		24,818			691,143		16,706
Loan/lease interest rate swaps – liabilities	347,060		(3,503		)	496,887		(8,891		)
Loan/lease interest rate caps – liabilities	143,084		(688		)	122,791		(509		)

September 30, 2017 December 31, 2016

Notional
Amount

Estimated
Fair Value

Notional
Amount

Estimated
Fair Value
Derivatives designated as hedges of fair value:
Financial institution counterparties:
Loan/lease interest rate swaps – assets $ 39,372
$ 296
$ 41,818
$ 368
Loan/lease interest rate swaps – liabilities 14,077
(764 ) 18,812
(1,278 )
Non-hedging interest rate derivatives:
Financial institution counterparties:
Loan/lease interest rate swaps – assets 206,930
747
206,745
2,649
Loan/lease interest rate swaps – liabilities 735,583
(14,623 ) 694,965
(25,466 )
Loan/lease interest rate caps – assets 114,744
547
85,966
575
Customer counterparties:
Loan/lease interest rate swaps – assets 735,583
22,384
694,965
25,467
Loan/lease interest rate swaps – liabilities 206,930
(2,442 ) 206,745
(2,649 )
Loan/lease interest rate caps – liabilities 114,744
(547 ) 85,966
(575 )

The weighted-average rates paid and received for interest rate swaps outstanding at ~~September 30, 2017~~March 31, 2019 were as follows:



	Weighted-Average
	Interest Rate Paid		Interest Rate Received
Interest rate swaps:
Fair value hedge loan/lease interest rate swaps	2.35	%	2.49	%
Non-hedging interest rate swaps – financial institution counterparties	4.18	%	4.11	%
Non-hedging interest rate swaps – customer counterparties	4.11	%	4.18	%

Weighted-Average

Interest
Rate
Paid

Interest
Rate
Received
Interest rate swaps:
Fair value hedge loan/lease interest rate swaps 2.32 % 1.23 %
Non-hedging interest rate swaps – financial institution counterparties 3.96 % 2.84 %
Non-hedging interest rate swaps – customer counterparties 2.84 % 3.96 %

The weighted-average strike rate for outstanding interest rate caps was ~~3.07%~~2.99% at ~~September 30, 2017.~~March 31, 2019.

Commodity Derivatives. We enter into commodity swaps and option contracts that are not designated as hedging instruments primarily to accommodate the business needs of our customers. Upon the origination of a commodity swap or option contract with a customer, we simultaneously enter into an offsetting contract with a third party financial institution to mitigate the exposure to fluctuations in commodity prices.

The notional amounts and estimated fair values of non-hedging commodity swap and option derivative positions outstanding are presented in the following table. We obtain dealer quotations and use internal valuation models with observable market data inputs to value our commodity derivative positions.



		March 31, 2019				December 31, 2018
	Notional Units	Notional Amount	Estimated Fair Value			Notional Amount	Estimated Fair Value
Financial institution counterparties:
Oil – assets	Barrels	1,520	$	5,495		2,416	$	24,332
Oil – liabilities	Barrels	1,546	(6,882		)	415	(646		)
Natural gas – assets	MMBTUs	4,061	438			5,745	417
Natural gas – liabilities	MMBTUs	10,630	(910		)	9,314	(1,272		)
Customer counterparties:
Oil – assets	Barrels	1,650	7,044			415	646
Oil – liabilities	Barrels	1,416	(5,377		)	2,416	(24,009		)
Natural gas – assets	MMBTUs	10,660	1,025			10,236	1,373
Natural gas – liabilities	MMBTUs	4,031	(433		)	4,823	(393		)

September 30, 2017 December 31, 2016

Notional
Units

Notional
Amount

Estimated
Fair Value

Notional
Amount

Estimated
Fair Value
Financial institution counterparties:
Oil – assets Barrels 977
$ 1,530
227
$ 206
Oil – liabilities Barrels 1,082
(1,311 ) 944
(4,400 )
Natural gas – assets MMBTUs 3,351
319
—
—
Natural gas – liabilities MMBTUs 1,546
(81 ) 1,299
(1,357 )
Customer counterparties:
Oil – assets Barrels 1,096
1,459
944
4,580
Oil – liabilities Barrels 963
(1,327 ) 227
(206 )
Natural gas – assets MMBTUs 1,546
96
1,299
1,393
Natural gas – liabilities MMBTUs 3,351
(285 ) —
—

Foreign Currency Derivatives. We enter into foreign currency forward contracts that are not designated as hedging instruments primarily to accommodate the business needs of our customers. Upon the origination of a foreign currency denominated transaction with a customer, we simultaneously enter into an offsetting contract with a third party financial institution to negate the exposure to fluctuations in foreign currency exchange rates. We also utilize foreign currency forward contracts that are not designated as hedging instruments to mitigate the economic effect of fluctuations in foreign currency exchange rates on foreign currency holdings and certain short-term, non-U.S. dollar denominated loans. The notional amounts and fair values of open foreign currency forward contracts were as follows:



		March 31, 2019				December 31, 2018
	Notional Currency	Notional Amount	Estimated Fair Value			Notional Amount	Estimated Fair Value
Financial institution counterparties:
Forward contracts – assets	GBP	91	$	—		—	$	—
Forward contracts – liabilities	CAD	7,451	(48		)	11,003	(13		)
Forward contracts – liabilities	GBP	—	—			142	(2		)
Forward contracts – liabilities	MXN	—	—			3,015	(132		)
Customer counterparties:
Forward contracts – assets	CAD	7,434	66			10,979	40
Forward contracts – assets	GBP	93	1			145	4
Forward contracts – assets	MXN	—	—			3,000	149

September 30, 2017 December 31, 2016

Notional
Currency

Notional
Amount

Estimated
Fair Value

Notional
Amount

Estimated
Fair Value
Financial institution counterparties:
Forward contracts – assets EUR 135
$ 1
—
$ —
Forward contracts – assets CAD 7,234
15
—
—
Forward contracts – assets GBP 547
1
—
—
Forward contracts – assets AUD 60
1
—
—
Forward contracts – liabilities EUR 4,693
(80 ) 870
(9 )
Forward contracts – liabilities CAD —
—
2,214
(21 )
Forward contracts – liabilities GBP 1,075
(24 ) 419
(3 )
Customer counterparties:
Forward contracts – assets EUR 3,867
104
—
—
Forward contracts – assets CAD 7,205
15
2,205
29
Forward contracts – assets GBP 192
2
—
—

Gains, Losses and Derivative Cash Flows. For fair value hedges, the changes in the fair value of both the derivative hedging instrument and the hedged item are included in other non-interest income or other non-interest expense. The extent that such changes in fair value do not offset represents hedge ineffectiveness. Net cash flows from interest rate swaps on commercial loans/leases designated as hedging instruments in effective hedges of fair value are included in interest income on loans. For non-hedging derivative instruments, gains and losses due to changes in fair value and all cash flows are included in other non-interest income and other non-interest expense.

Amounts included in the consolidated statements of income related to interest rate derivatives designated as hedges of fair value were as follows:



	Three Months Ended March 31,
	2019		2018
Commercial loan/lease interest rate swaps:
Amount of gain (loss) included in interest income on loans	$	26	$	(42	)

Three Months Ended
September 30, Nine Months Ended
September 30,
2017 2016 2017 2016
Commercial loan/lease interest rate swaps:
Amount of gain (loss) included in interest income on loans $ (149 ) $ (331 ) $ (592 ) $ (1,057 )
Amount of (gain) loss included in other non-interest expense (2 ) 4
(5 ) (3 )

As stated above, we enter into non-hedge related derivative positions primarily to accommodate the business needs of our customers. Upon the origination of a derivative contract with a customer, we simultaneously enter into an offsetting derivative contract with a third party financial institution. We recognize immediate income based upon the difference in the bid/ask spread of the underlying transactions with our customers and the third party. Because we act only as an intermediary for our customer,

subsequent changes in the fair value of the underlying derivative contracts for the most part offset each other and do not significantly impact our results of operations.

Amounts included in the consolidated statements of income related to non-hedging interest rate, commodity and foreign currency derivative instruments are presented in the table below.



	Three Months Ended March 31,
	2019		2018
Non-hedging interest rate derivatives:
Other non-interest income	$	586	$	1,488
Other non-interest expense	—		(21		)
Non-hedging commodity derivatives:
Other non-interest income	103		90
Non-hedging foreign currency derivatives:
Other non-interest income	17		59

Three Months Ended
September 30, Nine Months Ended
September 30,
2017 2016 2017 2016
Non-hedging interest rate derivatives:
Other non-interest income $ 1,085
$ 374
$ 2,062
$ 1,788
Other non-interest expense —
—
1
—
Non-hedging commodity derivatives:
Other non-interest income 231
110
387
255
Non-hedging foreign currency derivatives:
Other non-interest income 83
8
101
22

Counterparty Credit Risk. Our credit exposure relating to interest rate swaps, commodity swaps/options and foreign currency forward contracts with bank customers was approximately ~~$23.6~~$29.4 million at ~~September 30, 2017.~~March 31, 2019. This credit exposure is partly mitigated as transactions with customers are generally secured by the collateral, if any, securing the underlying transaction being hedged. Our credit exposure, net of collateral pledged, relating to interest rate swaps, commodity swaps/options and foreign currency forward contracts with upstream financial institution counterparties was approximately ~~$10.3~~$12.1 million at ~~September 30, 2017.~~March 31, 2019. This amount was primarily related to excess collateral we posted to counterparties. Collateral levels for upstream financial institution counterparties are monitored and adjusted as necessary. See Note 109 – Balance Sheet Offsetting and Repurchase Agreements for additional information regarding our credit exposure with upstream financial institution counterparties.

The aggregate fair value of securities we posted as collateral related to derivative contracts totaled ~~$13.2 million~~$146 thousand at ~~September 30, 2017.~~March 31, 2019. At such date, we also had ~~$10.6~~$24.7 million in cash collateral on deposit with other financial institution counterparties.

Note 109 - Balance Sheet Offsetting and Repurchase Agreements

Balance Sheet Offsetting. Certain financial instruments, including resell and repurchase agreements and derivatives, may be eligible for offset in the consolidated balance sheet and/or subject to master netting arrangements or similar agreements. Our derivative transactions with upstream financial institution counterparties are generally executed under International Swaps and Derivative Association (“ISDA”) master agreements which include “right of set-off” provisions. In such cases there is generally a legally enforceable right to offset recognized amounts and there may be an intention to settle such amounts on a net basis. Nonetheless, we do not generally offset such financial instruments for financial reporting purposes.

Information about financial instruments that are eligible for offset in the consolidated balance sheet as of ~~September 30, 2017~~March 31, 2019 is presented in the following tables.



	Gross Amount Recognized		Gross Amount Offset		Net Amount Recognized
March 31, 2019
Financial assets:
Derivatives:
Loan/lease interest rate swaps and caps	$	2,172	$	—	$	2,172
Commodity swaps and options	5,933		—		5,933
Foreign currency forward contracts	—		—		—
Total derivatives	8,105		—		8,105
Resell agreements	9,642		—		9,642
Total	$	17,747	$	—	$	17,747
Financial liabilities:
Derivatives:
Loan/lease interest rate swaps	$	13,053	$	—	$	13,053
Commodity swaps and options	7,792		—		7,792
Foreign currency forward contracts	48		—		48
Total derivatives	20,893		—		20,893
Repurchase agreements	1,210,224		—		1,210,224
Total	$	1,231,117	$	—	$	1,231,117

Gross Amount
Recognized

Gross Amount
Offset

Net Amount
Recognized
September 30, 2017
Financial assets:
Derivatives:
Loan/lease interest rate swaps and caps $ 1,590
$ —
$ 1,590
Commodity swaps and options 1,849
—
1,849
Foreign currency forward contracts 18
—
18
Total derivatives 3,457
—
3,457
Resell agreements 17,642
—
17,642
Total $ 21,099
$ —
$ 21,099
Financial liabilities:
Derivatives:
Loan/lease interest rate swaps $ 15,387
$ —
$ 15,387
Commodity swaps and options 1,392
—
1,392
Foreign currency forward contracts 104
—
104
Total derivatives 16,883
—
16,883
Repurchase agreements 987,869
—
987,869
Total $ 1,004,752
$ —
$ 1,004,752

Gross Amounts Not Offset

Net Amount
Recognized

Financial
Instruments
Collateral
Net
Amount
September 30, 2017
Financial assets:
Derivatives:
Counterparty A $ 397
$ (397 ) $ —
$ —
Counterparty B 866
(866 ) —
—
Counterparty C 204
(204 ) —
—
Counterparty D —
—
—
—
Other counterparties 1,990
(1,631 ) (130 ) 229
Total derivatives 3,457
(3,098 ) (130 ) 229
Resell agreements 17,642
—
(17,642 ) —
Total $ 21,099
$ (3,098 ) $ (17,772 ) $ 229
Financial liabilities:
Derivatives:
Counterparty A $ 8,984
$ (397 ) $ (8,587 ) $ —
Counterparty B 3,535
(866 ) (2,669 ) —
Counterparty C 1,128
(204 ) (830 ) 94
Counterparty D —
—
—
—
Other counterparties 3,236
(1,631 ) (1,605 ) —
Total derivatives 16,883
(3,098 ) (13,691 ) 94
Repurchase agreements 987,869
—
(987,869 ) —
Total $ 1,004,752
$ (3,098 ) $ (1,001,560 ) $ 94



			Gross Amounts Not Offset
	Net Amount Recognized		Financial Instruments			Collateral			Net Amount
March 31, 2019
Financial assets:
Derivatives:
Counterparty A	$	320	$	(320	)	$	—		$	—
Counterparty B	3,022		(3,022		)	—			—
Counterparty C	34		(34		)	—			—
Other counterparties	4,729		(3,969		)	(235		)	525
Total derivatives	8,105		(7,345		)	(235		)	525
Resell agreements	9,642		—			(9,642		)	—
Total	$	17,747	$	(7,345	)	$	(9,877	)	$	525
Financial liabilities:
Derivatives:
Counterparty A	$	4,753	$	(320	)	$	(4,433	)	$	—
Counterparty B	6,033		(3,022		)	(3,011		)	—
Counterparty C	183		(34		)	(149		)	—
Other counterparties	9,924		(3,969		)	(5,670		)	285
Total derivatives	20,893		(7,345		)	(13,263		)	285
Repurchase agreements	1,210,224		—			(1,210,224		)	—
Total	$	1,231,117	$	(7,345	)	$	(1,223,487	)	$	285

Information about financial instruments that are eligible for offset in the consolidated balance sheet as of December 31, ~~2016~~2018 is presented in the following tables.



	Gross Amount Recognized		Gross Amount Offset		Net Amount Recognized
December 31, 2018
Financial assets:
Derivatives:
Loan/lease interest rate swaps and caps	$	3,100	$	—	$	3,100
Commodity swaps and options	24,749		—		24,749
Foreign currency forward contracts	—		—		—
Total derivatives	27,849		—		27,849
Resell agreements	11,642		—		11,642
Total	$	39,491	$	—	$	39,491
Financial liabilities:
Derivatives:
Loan/lease interest rate swaps	$	9,120	$	—	$	9,120
Commodity swaps and options	1,918		—		1,918
Foreign currency forward contracts	147		—		147
Total derivatives	11,185		—		11,185
Repurchase agreements	1,360,298		—		1,360,298
Total	$	1,371,483	$	—	$	1,371,483

Gross Amount
Recognized

Gross Amount
Offset

Net Amount
Recognized
December 31, 2016
Financial assets:
Derivatives:
Loan/lease interest rate swaps and caps $ 3,592
$ —
$ 3,592
Commodity swaps and options 206
—
206
Foreign currency forward contracts —
—
—
Total derivatives 3,798
—
3,798
Resell agreements 9,642
—
9,642
Total $ 13,440
$ —
$ 13,440
Financial liabilities:
Derivatives:
Loan/lease interest rate swaps $ 26,744
$ —
$ 26,744
Commodity swaps and options 5,757
—
5,757
Foreign currency forward contracts 33
—
33
Total derivatives 32,534
—
32,534
Repurchase agreements 963,317
—
963,317
Total $ 995,851
$ —
$ 995,851

Gross Amounts Not Offset

Net Amount
Recognized

Financial
Instruments
Collateral
Net
Amount
December 31, 2016
Financial assets:
Derivatives:
Counterparty A $ 687
$ (687 ) $ —
$ —
Counterparty B 223
(223 ) —
—
Counterparty C 158
(158 ) —
—
Counterparty D 1,820
(1,820 ) —
—
Other counterparties 910
(677 ) (64 ) 169
Total derivatives 3,798
(3,565 ) (64 ) 169
Resell agreements 9,642
—
(9,642 ) —
Total $ 13,440
$ (3,565 ) $ (9,706 ) $ 169
Financial liabilities:
Derivatives:
Counterparty A $ 11,233
$ (687 ) $ (10,026 ) $ 520
Counterparty B 6,867
(223 ) (6,344 ) 300
Counterparty C 4,578
(158 ) (4,415 ) 5
Counterparty D 7,706
(1,820 ) (5,886 ) —
Other counterparties 2,150
(677 ) (676 ) 797
Total derivatives 32,534
(3,565 ) (27,347 ) 1,622
Repurchase agreements 963,317
—
(963,317 ) —
Total $ 995,851
$ (3,565 ) $ (990,664 ) $ 1,622



			Gross Amounts Not Offset
	Net Amount Recognized		Financial Instruments			Collateral			Net Amount
December 31, 2018
Financial assets:
Derivatives:
Counterparty A	$	598	$	(598	)	$	—		$	—
Counterparty B	7,255		(3,380		)	(3,875		)	—
Counterparty C	81		(81		)	—			—
Other counterparties	19,915		(2,084		)	(17,776		)	55
Total derivatives	27,849		(6,143		)	(21,651		)	55
Resell agreements	11,642		—			(11,642		)	—
Total	$	39,491	$	(6,143	)	$	(33,293	)	$	55
Financial liabilities:
Derivatives:
Counterparty A	$	4,293	$	(598	)	$	(3,651	)	$	44
Counterparty B	3,380		(3,380		)	—			—
Counterparty C	326		(81		)	(245		)	—
Other counterparties	3,186		(2,084		)	(725		)	377
Total derivatives	11,185		(6,143		)	(4,621		)	421
Repurchase agreements	1,360,298		—			(1,360,298		)	—
Total	$	1,371,483	$	(6,143	)	$	(1,364,919	)	$	421

Repurchase Agreements. We utilize securities sold under agreements to repurchase to facilitate the needs of our customers and to facilitate secured short-term funding needs. Securities sold under agreements to repurchase are stated at the amount of cash received in connection with the transaction. We monitor collateral levels on a continuous basis. We may be required to provide additional collateral based on the fair value of the underlying securities. Securities pledged as collateral under repurchase agreements are maintained with our safekeeping agents.

The remaining contractual maturity of repurchase agreements in the consolidated balance sheets as of ~~September 30, 2017~~March 31, 2019 and December 31, ~~2016~~2018 is presented in the following tables.



	Remaining Contractual Maturity of the Agreements
	Overnight and Continuous		Up to 30 Days		30-90 Days		Greater than 90 Days		Total
March 31, 2019
Repurchase agreements:
U.S. Treasury	$	1,098,844	$	—	$	—	$	—	$	1,098,844
Residential mortgage-backed securities	111,380		—		—		—		111,380
Total borrowings	$	1,210,224	$	—	$	—	$	—	$	1,210,224
Gross amount of recognized liabilities for repurchase agreements									$	1,210,224
Amounts related to agreements not included in offsetting disclosures above									$	—

December 31, 2018
Repurchase agreements:
U.S. Treasury	$	1,334,063	$	—	$	—	$	—	$	1,334,063
Residential mortgage-backed securities	26,235		—		—		—		26,235
Total borrowings	$	1,360,298	$	—	$	—	$	—	$	1,360,298
Gross amount of recognized liabilities for repurchase agreements									$	1,360,298
Amounts related to agreements not included in offsetting disclosures above									$	—

Remaining Contractual Maturity of the Agreements
Overnight and Continuous Up to 30 Days 30-90 Days Greater than 90 Days Total
September 30, 2017
Repurchase agreements:
U.S. Treasury $ 907,509
$ —
$ —
$ —
$ 907,509
Residential mortgage-backed securities 80,360
—
—
—
80,360
Total borrowings $ 987,869
$ —
$ —
$ —
$ 987,869
Gross amount of recognized liabilities for repurchase agreements $ 987,869
Amounts related to agreements not included in offsetting disclosures above $ —

December 31, 2016
Repurchase agreements:
U.S. Treasury $ 841,475
$ —
$ —
$ —
$ 841,475
Residential mortgage-backed securities 121,842
—
—
—
121,842
Total borrowings $ 963,317
$ —
$ —
$ —
$ 963,317
Gross amount of recognized liabilities for repurchase agreements $ 963,317
Amounts related to agreements not included in offsetting disclosures above $ —

Note 1110 - Stock-Based Compensation

A combined summary of activity in our active stock plans is presented in the table. Performance stock units outstanding are presented assuming attainment of the maximum payout rate as set forth by the performance criteria. ~~The target award level for performance stock units granted in 2016 was 29,240.~~As of ~~September 30, 2017,~~March 31, 2019, there were ~~1,499,399~~1,268,144 shares remaining available for grant for future stock-based compensation awards.



	Director Deferred Stock Units Outstanding			Non-Vested Stock Awards/Stock Units Outstanding				Performance Stock Units Outstanding			Stock Options Outstanding
	Number of Units	Weighted- Average Fair Value at Grant		Number of Shares/Units		Weighted- Average Fair Value at Grant		Number of Units	Weighted- Average Fair Value at Grant		Number of Shares		Weighted- Average Exercise Price
Balance, January 1, 2019	48,910	$	71.14	383,797		$	85.59	125,809	$	82.55	2,352,008		$	63.55
Authorized	—	—		—		—		—	—		—		—
Granted	—	—		1,631		91.95		—	—		—		—
Exercised/vested	—	—		(17,800	)	65.11		—	—		(83,065	)	58.82
Forfeited/expired	—	—		(998	)	92.65		—	—		(4,500	)	65.11
Balance, March 31, 2019	48,910	$	71.14	366,630		$	86.59	125,809	$	82.55	2,264,443		$	63.72

Director Deferred
Stock Units
Outstanding

Non-Vested Stock
Awards/Stock Units
Outstanding
Performance Stock Units Outstanding
Stock Options
Outstanding
Number of Units
Weighted-
Average
Fair Value
at Grant

Number
of Shares/Units

Weighted-
Average
Fair Value
at Grant
Number of Units
Weighted-
Average
Fair Value
at Grant

Number
of Shares

Weighted-
Average
Exercise
Price
Balance, January 1, 2017 53,659
$ 61.48
256,850
$ 73.43
43,860
$ 69.70
4,089,028
$ 62.67
Authorized —
—
—
—
—
—
—
—
Granted 5,447
95.37
—
—
—
—
—
—
Exercised/vested (6,098 ) 62.29
(1,730 ) 76.07
—
—
(766,971 ) 59.22
Forfeited/expired —
—
(2,860 ) 76.07
—
—
(50,764 ) 69.65
Balance, September 30, 2017 53,008
$ 64.87
252,260
$ 73.38
43,860
$ 69.70
3,271,293
$ 63.37

Shares issued in connection with stock compensation awards are issued from available treasury shares. If no treasury shares are available, new shares are issued from available authorized shares. Shares issued in connection with stock compensation awards along with other related information were as follows:



	Three Months Ended March 31,
	2019		2018
New shares issued from available authorized shares	—		—
Issued from available treasury stock	100,865		318,110
Total	100,865		318,110

Proceeds from stock option exercises	$	4,885	$	19,165

Three Months Ended
September 30, Nine Months Ended
September 30,
2017 2016 2017 2016
New shares issued from available authorized shares 9,299
—
602,662
—
Issued from available treasury stock 13,425
841,846
172,137
908,921
Total 22,724
841,846
774,799
908,921

Proceeds from stock option exercises $ 1,274
$ 44,287
$ 45,422
$ 47,873

Stock-based compensation expense is recognized ratably over the requisite service period for all awards. For most stock option awards, the service period generally matches the vesting period. For stock options granted to certain executive officers and for non-vested stock units granted to all participants, the service period does not extend past the date the participant reaches 65 years of age. Deferred stock units granted to non-employee directors generally have immediate vesting and the related expense is fully recognized on the date of grant. For performance stock units, the service period generally matches the three-year performance period specified by the award, however, the service period does not extend past the date the participant reaches 65 years of age. Expense recognized each period is dependent upon our estimate of the number of shares that will ultimately be issued.

Stock-based compensation expense and the related income tax benefit is presented in the following table.



	Three Months Ended March 31,
	2019		2018
Stock options	$	382	$	1,085
Non-vested stock awards/stock units	2,135		1,468
Director deferred stock units	—		—
Performance stock units	1,137		622
Total	$	3,654	$	3,175
Income tax benefit	$	584	$	667

Three Months Ended
September 30, Nine Months Ended
September 30,
2017 2016 2017 2016
Stock options $ 1,532
$ 2,163
$ 4,892
$ 6,405
Non-vested stock awards/stock units 813
358
2,747
1,073
Director deferred stock units —
—
519
520
Performance stock units 377
—
855
—
Total $ 2,722
$ 2,521
$ 9,013
$ 7,998
Income tax benefit $ 953
$ 882
$ 3,155
$ 2,799

Unrecognized stock-based compensation expense at ~~September 30, 2017~~March 31, 2019 is presented in the table below. Unrecognized stock-based compensation expense related to performance stock units is presented assuming attainment of the maximum payout rate as set forth by the performance criteria.



Stock options	$	866
Non-vested stock awards/stock units	15,724
Performance stock units	5,390
Total	$	21,980

Stock options $ 6,952
Non-vested stock awards/stock units 7,448
Performance stock units 2,202
Total $ 16,602

Note 1211 - Earnings Per Common Share

Earnings per common share is computed using the two-class method as more fully described in our ~~2016~~2018 Form 10-K. The following table presents a reconciliation of net income available to common shareholders, net earnings allocated to common stock and the number of shares used in the calculation of basic and diluted earnings per common share.



	Three Months Ended March 31,
	2019		2018
Net income	$	116,496	$	106,480
Less: Preferred stock dividends	2,016		2,016
Net income available to common shareholders	114,480		104,464
Less: Earnings allocated to participating securities	980		702
Net earnings allocated to common stock	$	113,500	$	103,762

Distributed earnings allocated to common stock	$	42,238	$	36,306
Undistributed earnings allocated to common stock	71,262		67,456
Net earnings allocated to common stock	$	113,500	$	103,762

Weighted-average shares outstanding for basic earnings per common share	63,009,060		63,649,198
Dilutive effect of stock compensation	818,896		1,012,997
Weighted-average shares outstanding for diluted earnings per common share	63,827,956		64,662,195

Three Months Ended
September 30, Nine Months Ended
September 30,
2017 2016 2017 2016
Net income $ 93,131
$ 80,219
$ 263,625
$ 220,542
Less: Preferred stock dividends 2,016
2,016
6,047
6,047
Net income available to common shareholders 91,115
78,203
257,578
214,495
Less: Earnings allocated to participating securities 475
282
1,346
769
Net earnings allocated to common stock $ 90,640
$ 77,921
$ 256,232
$ 213,726

Distributed earnings allocated to common stock $ 36,174
$ 33,918
$ 107,194
$ 100,203
Undistributed earnings allocated to common stock 54,466
44,003
149,038
113,523
Net earnings allocated to common stock $ 90,640
$ 77,921
$ 256,232
$ 213,726

Weighted-average shares outstanding for basic earnings per common share 63,667,356
62,449,660
63,822,011
62,114,075
Dilutive effect of stock compensation 897,945
691,543
957,337
448,290
Weighted-average shares outstanding for diluted earnings per common share 64,565,301
63,141,203
64,779,348
62,562,365

Note 1312 - Defined Benefit Plans

The components of the combined net periodic expense (benefit) for our defined benefit pension plans are presented in the table below.



	Three Months Ended March 31,
	2019			2018
Expected return on plan assets, net of expenses	$	(2,693	)	$	(2,979	)
Interest cost on projected benefit obligation	1,618			1,475
Net amortization and deferral	1,406			1,250
Net periodic expense (benefit)	$	331		$	(254	)

Three Months Ended
September 30, Nine Months Ended
September 30,
2017 2016 2017 2016
Expected return on plan assets, net of expenses $ (2,779 ) $ (2,890 ) $ (8,338 ) $ (8,669 )
Interest cost on projected benefit obligation 1,547
1,732
4,642
5,230
Net amortization and deferral 1,357
1,585
4,072
4,691
SERP settlement costs —
—
—
187
Net periodic expense (benefit) $ 125
$ 427
$ 376
$ 1,439

Our non-qualified defined benefit pension plan is not funded. No contributions to the qualified defined benefit pension plan were made during the ~~nine~~three months ended ~~September 30, 2017.~~March 31, 2019. We do not expect to make any contributions to the qualified defined benefit plan during the remainder of ~~2017.~~2019.

Note 1413 - Income Taxes

Income tax expense was as follows:



	Three Months Ended March 31,
	2019			2018
Current income tax expense (benefit)	$	14,999		$	746
Deferred income tax expense (benefit)	(1,044		)	10,411
Income tax expense, as reported	$	13,955		$	11,157

Effective tax rate	10.7		%	9.5		%

Three Months Ended
September 30, Nine Months Ended
September 30,
2017 2016 2017 2016
Current income tax expense $ 15,224
$ 12,848
$ 44,636
$ 40,251
Deferred income tax expense (benefit) (5,332 ) (1,996 ) (9,505 ) (11,629 )
Income tax expense, as reported $ 9,892
$ 10,852
$ 35,131
$ 28,622

Effective tax rate 9.6 % 11.9 % 11.8 % 11.5 %

~~Net~~We had a net deferred tax ~~assets totaled $28.9~~liability totaling $21.0 million at ~~September 30, 2017~~March 31, 2019 and ~~$63.7~~a net deferred tax asset totaling $19.8 million at December 31, ~~2016.~~2018. The change in net deferred taxes was primarily related to unrealized gains on available-for-sale securities during the three months ended March 31, 2019. No valuation allowance for deferred tax assets was recorded at ~~September 30, 2017~~March 31, 2019 as management believes it is more likely than not that all of the deferred tax assets will be realized ~~because they were supported by recoverable taxes paid in prior years.~~against deferred tax liabilities and projected future taxable income.

The effective income tax rates differed from the U.S. statutory ~~rate~~federal income tax rates of ~~35%~~21% during the comparable periods primarily due to the effect of tax-exempt income from loans, securities and life insurance policies and the income tax effects associated with stock-based compensation. The effective income tax rates for the three and nine months ended September 30, 2017 were also impacted by the correction of an over-accrual of taxes that resulted from incorrectly classifying certain tax-exempt loans as taxable for federal income tax purposes since 2013. As a result, we recognized tax benefits totaling $3.7 million, which included $2.9 million related to the 2013 through 2016 tax years and $756 thousand related to the first and second quarters of 2017. There were no unrecognized tax benefits during any of the reported periods. Interest and/or penalties related to income taxes are reported as a component of income tax expense. Such amounts were not significant during the reported periods.

We file income tax returns in the U.S. federal jurisdiction. We are no longer subject to U.S. federal income tax examinations by tax authorities for years before ~~2013.~~2015.

Note 1514 - Other Comprehensive Income (Loss)

The before and after tax amounts allocated to each component of other comprehensive income (loss) are presented in the following table. Reclassification adjustments related to securities available for sale are included in net gain (loss) on securities transactions in the accompanying consolidated statements of income. Reclassification adjustments related to defined-benefit post-retirement benefit plans are included in the computation of net periodic pension expense (see Note 1312 – Defined Benefit Plans).



	Three Months Ended March 31, 2019									Three Months Ended March 31, 2018
	Before Tax Amount			Tax Expense, (Benefit)			Net of Tax Amount			Before Tax Amount			Tax Expense, (Benefit)			Net of Tax Amount
Securities available for sale and transferred securities:
Change in net unrealized gain/loss during the period	$	198,146		$	41,611		$	156,535		$	(178,904	)	$	(37,570	)	$	(141,334	)
Change in net unrealized gain on securities transferred to held to maturity	(344		)	(72		)	(272		)	(2,619		)	(550		)	(2,069		)
Reclassification adjustment for net (gains) losses included in net income	—			—			—			19			4			15
Total securities available for sale and transferred securities	197,802			41,539			156,263			(181,504		)	(38,116		)	(143,388		)
Defined-benefit post-retirement benefit plans:
Change in the net actuarial gain/loss	—			—			—			—			—			—
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit)	1,406			295			1,111			1,250			263			987
Total defined-benefit post-retirement benefit plans	1,406			295			1,111			1,250			263			987
Total other comprehensive income (loss)	$	199,208		$	41,834		$	157,374		$	(180,254	)	$	(37,853	)	$	(142,401	)

Three Months Ended
September 30, 2017 Three Months Ended
September 30, 2016

Before Tax
Amount

Tax Expense,
(Benefit)

Net of Tax
Amount

Before Tax
Amount

Tax Expense,
(Benefit)

Net of Tax
Amount
Securities available for sale and transferred securities:
Change in net unrealized gain/loss during the period $ 7,082
$ 2,479
$ 4,603
$ (95,641 ) $ (33,473 ) $ (62,168 )
Change in net unrealized gain on securities transferred to held to maturity (3,514 ) (1,230 ) (2,284 ) (7,278 ) (2,547 ) (4,731 )
Reclassification adjustment for net (gains) losses included in net income 4,867
1,703
3,164
37
12
25
Total securities available for sale and transferred securities 8,435
2,952
5,483
(102,882 ) (36,008 ) (66,874 )
Defined-benefit post-retirement benefit plans:
Change in the net actuarial gain/loss —
—
—
—
—
—
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit) 1,357
475
882
1,585
555
1,030
Total defined-benefit post-retirement benefit plans 1,357
475
882
1,585
555
1,030
Total other comprehensive income (loss) $ 9,792
$ 3,427
$ 6,365
$ (101,297 ) $ (35,453 ) $ (65,844 )

Nine Months Ended
September 30, 2017 Nine Months Ended
September 30, 2016

Before Tax
Amount

Tax Expense,
(Benefit)

Net of Tax
Amount

Before Tax
Amount

Tax Expense,
(Benefit)

Net of Tax
Amount
Securities available for sale and transferred securities:
Change in net unrealized gain/loss during the period $ 131,283
$ 45,949
$ 85,334
$ 191,865
$ 67,154
$ 124,711
Change in net unrealized gain on securities transferred to held to maturity (13,660 ) (4,781 ) (8,879 ) (24,629 ) (8,620 ) (16,009 )
Reclassification adjustment for net (gains) losses included in net income 4,917
1,721
3,196
(14,866 ) (5,204 ) (9,662 )
Total securities available for sale and transferred securities 122,540
42,889
79,651
152,370
53,330
99,040
Defined-benefit post-retirement benefit plans:
Change in the net actuarial gain/loss —
—
—
(862 ) (302 ) (560 )
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit) 4,072
1,425
2,647
4,878
1,708
3,170
Total defined-benefit post-retirement benefit plans 4,072
1,425
2,647
4,016
1,406
2,610
Total other comprehensive income (loss) $ 126,612
$ 44,314
$ 82,298
$ 156,386
$ 54,736
$ 101,650

Activity in accumulated other comprehensive income (loss), net of tax, was as follows:



	Securities Available For Sale			Defined Benefit Plans			Accumulated Other Comprehensive Income
Balance January 1, 2019	$	(16,103	)	$	(47,497	)	$	(63,600	)
Other comprehensive income (loss) before reclassifications	156,263			—			156,263
Reclassification of amounts included in net income	—			1,111			1,111
Net other comprehensive income (loss) during period	156,263			1,111			157,374
Balance at March 31, 2019	$	140,160		$	(46,386	)	$	93,774

Balance January 1, 2018	$	117,230		$	(37,718	)	$	79,512
Other comprehensive income (loss) before reclassifications	(143,403		)	—			(143,403		)
Reclassification of amounts included in net income	15			987			1,002
Net other comprehensive income (loss) during period	(143,388		)	987			(142,401		)
Reclassification of certain income tax effects related to the change in the U.S. statutory federal income tax rate under the Tax Cuts and Jobs Act to retained earnings	17,557			(8,022		)	9,535
Balance at March 31, 2018	$	(8,601	)	$	(44,753	)	$	(53,354	)

Securities
Available
For Sale

Defined
Benefit
Plans

Accumulated
Other
Comprehensive
Income
Balance January 1, 2017 $ 16,153
$ (40,776 ) $ (24,623 )
Other comprehensive income (loss) before reclassifications 76,455
—
76,455
Amounts reclassified from accumulated other comprehensive income (loss) 3,196
2,647
5,843
Net other comprehensive income (loss) during period 79,651
2,647
82,298
Balance at September 30, 2017 $ 95,804
$ (38,129 ) $ 57,675

Balance January 1, 2016 $ 160,611
$ (46,748 ) $ 113,863
Other comprehensive income (loss) before reclassifications 108,702
2,489
111,191
Amounts reclassified from accumulated other comprehensive income (loss) (9,662 ) 121
(9,541 )
Net other comprehensive income (loss) during period 99,040
2,610
101,650
Balance at September 30, 2016 $ 259,651
$ (44,138 ) $ 215,513

Note 1615 – Operating Segments

We are managed under a matrix organizational structure whereby our two primary operating segments, Banking and Frost Wealth Advisors, overlap a regional reporting structure. See our ~~2016~~2018 Form 10-K for additional information regarding our operating segments. Summarized operating results by segment were as follows:



	Banking		Frost Wealth Advisors		Non-Banks			Consolidated
Revenues from (expenses to) external customers:
Three months ended:
March 31, 2019	$	308,613	$	37,351	$	(2,710	)	$	343,254
March 31, 2018	288,561		35,081		(2,449		)	321,193
Net income (loss):
Three months ended:
March 31, 2019	$	112,917	$	6,400	$	(2,821	)	$	116,496
March 31, 2018	103,641		5,634		(2,795		)	106,480

Banking
Frost Wealth
Advisors
Non-Banks Consolidated
Revenues from (expenses to) external customers:
Three months ended:
September 30, 2017 $ 266,582
$ 36,529
$ (2,285 ) $ 300,826
September 30, 2016 244,343
33,536
(1,258 ) 276,621
Nine months ended:
September 30, 2017 $ 786,743
$ 107,829
$ (5,669 ) $ 888,903
September 30, 2016 737,060
97,484
(3,537 ) 831,007
Net income (loss):
Three months ended:
September 30, 2017 $ 88,368
$ 6,417
$ (1,654 ) $ 93,131
September 30, 2016 76,347
4,797
(925 ) 80,219
Nine months ended:
September 30, 2017 $ 250,766
$ 17,990
$ (5,131 ) $ 263,625
September 30, 2016 210,454
13,809
(3,721 ) 220,542

Note 1716 – Fair Value Measurements

The fair value of an asset or liability is the price that would be received to sell that asset or paid to transfer that liability in an orderly transaction occurring in the principal market (or most advantageous market in the absence of a principal market) for such asset or liability. In estimating fair value, we utilize valuation techniques that are consistent with the market approach, the income approach and/or the cost approach. Such valuation techniques are consistently applied. Inputs to valuation techniques include the assumptions that market participants would use in pricing an asset or liability. ASC Topic 820 establishes a three-level fair value hierarchy for valuation inputs that gives the highest priority to quoted prices in active markets for identical assets or liabilities and the lowest priority to unobservable inputs. See our ~~2016~~2018 Form 10-K for additional information regarding the fair value hierarchy and a description of our valuation techniques.

Financial Assets and Financial Liabilities. The table below summarizes financial assets and financial liabilities measured at fair value on a recurring basis as of ~~September 30, 2017~~March 31, 2019 and December 31, ~~2016,~~2018, segregated by the level of the valuation inputs within the fair value hierarchy of ASC Topic 820 utilized to measure fair value.


	Level 1 Inputs		Level 2 Inputs		Level 3 Inputs		Total Fair Value		Level 1 Inputs		Level 2 Inputs		Level 3 Inputs		Total Fair Value
September 30, 2017
March 31, 2019
Securities available for sale:
U.S. Treasury	$	3,473,628	$	—	$	—	$	3,473,628	$	3,445,068	$	—	$	—	$	3,445,068
Residential mortgage-backed securities	—		681,195		—		681,195		—		1,227,435		—		1,227,435
States and political subdivisions	—		5,987,739		—		5,987,739		—		7,298,726		—		7,298,726
Other	—		42,538		—		42,538		—		42,734		—		42,734
Trading account securities:
U.S. Treasury	18,814		—		—		18,814		22,503		—		—		22,503
States and political subdivisions	—		907		—		907		—		2,728		—		2,728
Derivative assets:
Interest rate swaps, caps and floors	—		23,974		—		23,974		—		26,990		—		26,990
Commodity swaps and options	—		3,404		—		3,404		—		14,002		—		14,002
Foreign currency forward contracts	139		—		—		139		67		—		—		67
Derivative liabilities:
Interest rate swaps, caps and floors	—		18,376		—		18,376		—		17,244		—		17,244
Commodity swaps and options	—		3,004		—		3,004		—		13,602		—		13,602
Foreign currency forward contracts	104		—		—		104		48		—		—		48
December 31, 2016
Securities available for sale:
U.S. Treasury	$	4,019,731	$	—	$	—	$	4,019,731
Residential mortgage-backed securities	—		785,167		—		785,167
States and political subdivisions	—		5,355,885		—		5,355,885
Other	—		42,494		—		42,494
Trading account securities:
U.S. Treasury	16,594		—		—		16,594
States and political subdivisions	—		109		—		109
Derivative assets:
Interest rate swaps, caps and floors	—		29,059		—		29,059
Commodity swaps and options	—		6,179		—		6,179
Foreign currency forward contracts	29		—		—		29
Derivative liabilities:
Interest rate swaps, caps and floors	—		29,968		—		29,968
Commodity swaps and options	—		5,963		—		5,963
Foreign currency forward contracts	33		—		—		33



	Level 1 Inputs		Level 2 Inputs		Level 3 Inputs		Total Fair Value
December 31, 2018
Securities available for sale:
U.S. Treasury	$	3,427,689	$	—	$	—	$	3,427,689
Residential mortgage-backed securities	—		829,740		—		829,740
States and political subdivisions	—		7,087,202		—		7,087,202
Other	—		42,690		—		42,690
Trading account securities:
U.S. Treasury	21,928		—		—		21,928
States and political subdivisions	—		2,158		—		2,158
Derivative assets:
Interest rate swaps, caps and floors	—		19,806		—		19,806
Commodity swaps and options	—		26,768		—		26,768
Foreign currency forward contracts	193		—		—		193
Derivative liabilities:
Interest rate swaps, caps and floors	—		18,520		—		18,520
Commodity swaps and options	—		26,320		—		26,320
Foreign currency forward contracts	147		—		—		147

Certain financial assets and financial liabilities are measured at fair value on a nonrecurring basis; that is, 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). Financial assets measured at fair value on a non-recurring basis during the reported periods include certain impaired loans reported at the fair value of the underlying collateral if repayment is expected solely from the collateral. The following table presents impaired loans that were remeasured and reported at fair value through a specific valuation allowance allocation of the allowance for loan losses based upon the fair value of the underlying collateral during the reported periods.



	Three Months Ended March 31, 2019						Three Months Ended March 31, 2018
	Level 2			Level 3			Level 2			Level 3
Carrying value of impaired loans before allocations	$	11,487		$	37,525		$	365		$	56,788
Specific valuation allowance (allocations) reversals of prior allocations	(256		)	(3,441		)	(64		)	(1,520		)
Fair value	$	11,231		$	34,084		$	301		$	55,268

Nine Months Ended
September 30, 2017 Nine Months Ended
September 30, 2016
Level 2 Level 3 Level 2 Level 3
Carrying value of impaired loans before allocations $ —
$ 64,287
$ —
$ 11,023
Specific valuation allowance (allocations) reversals of prior allocations —
(13,477 ) —
(3,750 )
Fair value $ —
$ 50,810
$ —
$ 7,273

Non-Financial Assets and Non-Financial Liabilities. We do not have any non-financial assets or non-financial liabilities measured at fair value on a recurring basis. Non-financial assets measured at fair value on a non-recurring basis during the reported periods include certain foreclosed assets which, upon initial recognition, were remeasured and reported at fair value through a charge-off to the allowance for loan losses and certain foreclosed assets which, subsequent to their initial recognition, were remeasured at fair value through a write-down included in other non-interest expense. The following table presents foreclosed assets that were remeasured and reported at fair value during the reported periods:



	Three Months Ended March 31,
	2019		2018
Foreclosed assets remeasured at initial recognition:
Carrying value of foreclosed assets prior to remeasurement	$	—	$	7
Charge-offs recognized in the allowance for loan losses	—		—
Fair value	$	—	$	7
Foreclosed assets remeasured subsequent to initial recognition:
Carrying value of foreclosed assets prior to remeasurement	$	—	$	1,823
Write-downs included in other non-interest expense	—		(473		)
Fair value	$	—	$	1,350

Nine Months Ended
September 30, 2017
2017 2016
Foreclosed assets remeasured at initial recognition:
Carrying value of foreclosed assets prior to remeasurement $ —
$ 425
Charge-offs recognized in the allowance for loan losses —
(3 )
Fair value $ —
$ 422
Foreclosed assets remeasured subsequent to initial recognition:
Carrying value of foreclosed assets prior to remeasurement $ 89
$ 492
Write-downs included in other non-interest expense (16 ) (217 )
Fair value $ 73
$ 275

Financial Instruments Reported at Amortized Cost. The estimated fair values of financial instruments that are reported at amortized cost in our consolidated balance sheets, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value, were as follows:



	March 31, 2019				December 31, 2018
	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
Financial assets:
Level 2 inputs:
Cash and cash equivalents	$	2,281,454	$	2,281,454	$	3,955,779	$	3,955,779
Securities held to maturity	1,077,279		1,097,858		1,106,057		1,116,953
Cash surrender value of life insurance policies	184,371		184,371		183,473		183,473
Accrued interest receivable	142,977		142,977		188,989		188,989
Level 3 inputs:
Loans, net	14,269,989		14,256,028		13,967,601		13,933,239
Financial liabilities:
Level 2 inputs:
Deposits	26,294,863		26,291,609		27,149,204		27,143,572
Federal funds purchased and repurchase agreements	1,227,149		1,227,149		1,367,548		1,367,548
Junior subordinated deferrable interest debentures	136,256		137,115		136,242		137,115
Subordinated notes payable and other borrowings	98,747		101,238		98,708		98,458
Accrued interest payable	7,844		7,844		7,394		7,394

September 30, 2017 December 31, 2016

Carrying
Amount

Estimated
Fair Value

Carrying
Amount

Estimated
Fair Value
Financial assets:
Level 2 inputs:
Cash and cash equivalents $ 5,091,903
$ 5,091,903
$ 4,141,445
$ 4,141,445
Securities held to maturity 1,442,222
1,476,653
2,250,460
2,262,747
Cash surrender value of life insurance policies 179,789
179,789
177,884
177,884
Accrued interest receivable 118,035
118,035
156,714
156,714
Level 3 inputs:
Loans, net 12,552,001
12,574,862
11,822,347
11,903,956
Financial liabilities:
Level 2 inputs:
Deposits 26,403,269
26,398,885
25,811,575
25,812,039
Federal funds purchased and repurchase agreements 997,919
997,919
976,992
976,992
Junior subordinated deferrable interest debentures 136,170
137,115
136,127
137,115
Subordinated notes payable and other borrowings 98,512
102,072
99,990
100,000
Accrued interest payable 1,737
1,737
1,204
1,204
Under ASC Topic 825, entities may choose to measure eligible financial instruments at fair value at specified election dates. The fair value measurement option (i) may be applied instrument by instrument, with certain exceptions, (ii) is generally irrevocable and (iii) is applied only to entire instruments and not to portions of instruments. Unrealized gains and losses on items for which the fair value measurement option has been elected must be reported in earnings at each subsequent reporting date. During the reported periods, we had no financial instruments measured at fair value under the fair value measurement option.

Note 1817 - Accounting Standards Updates

Information about certain recently issued accounting standards updates is presented below. Also refer to Note 2120 - Accounting Standards Updates in our ~~2016~~2018 Form 10-K for additional information related to previously issued accounting standards updates.

~~Accounting Standards Update (“ASU”) 2014-09, “Revenue from Contracts with Customers (Topic 606).”~~ ASU 2014-09 implements a common revenue standard that clarifies the principles for recognizing revenue. The core principle of ASU 2014-09 is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. To achieve that core principle, an entity should apply the following steps: (i) identify the contract(s) with a customer, (ii) identify the performance obligations in the contract, (iii) determine the transaction price, (iv) allocate the transaction price to the performance obligations in the contract and (v) recognize revenue when (or as) the entity satisfies a performance obligation. ASU 2014-09 was originally going to be effective for us on January 1, 2017; however, the FASB issued ~~ASU 2015-14, “Revenue from Contracts with Customers (Topic 606) – Deferral of the Effective Date"~~ which deferred the effective date of ASU 2014-09 by one year to January 1, 2018. Our revenue is comprised of net interest income on financial assets and financial liabilities, which is explicitly excluded from the scope of ASU 2014-09, and non-interest income. We expect that ASU 2014-09 will require us to change how we recognize certain recurring revenue streams within trust and investment management fees, insurance commissions and fees and other categories of non-interest income; however, we do not expect these changes to have a significant impact on our financial statements. We expect to adopt the standard in the first quarter of 2018 with a cumulative effect adjustment to opening retained earnings, if such adjustment is deemed to be significant.

ASU 2016-02,~~“Leases~~ “Leases (Topic 842).” ASU 2016-02, ~~will,~~ among other things, ~~require~~requires lessees to recognize a lease liability, which is a lessee's obligation to make lease payments arising from a lease, measured on a discounted basis; and a right-of-use asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term. We adopted ASU 2016-02, ~~does not significantly change~~along with several other subsequent codification updates related to lease accounting, ~~requirements applicable to lessors; however, certain changes were made to align, where necessary, lessor accounting with the lessee accounting model and~~ ~~ASC Topic 606, “Revenue from Contracts with Customers.” ASU 2016-02 will be effective for us on~~as of January 1, ~~2019 and will require transition using a modified retrospective approach~~2019. See Note 1 - Significant Accounting Policies for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements. We are currently evaluating the potential impact of ASU 2016-02 on our financial statements. In that regard, we have selected, and will soon implement, a third-party vendor solution to assist us in the application of ASU 2016-02.additional information.

ASU 2016-13, “Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.” ASU 2016-13 requires the measurement of all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts and requires enhanced disclosures related to the significant estimates and judgments used in estimating credit losses, as well as the credit quality and underwriting standards of an organization’s portfolio. In addition, ASU 2016-13 amends the accounting for credit losses on available-for-sale debt securities and purchased financial assets with credit deterioration. ASU 2016-13 will be effective on January 1, 2020. We are currently evaluating the potential impact of ASU 2016-13 on our financial statements. In that regard, we have formed a cross-functional working group, under the direction of our Chief Financial Officer and our Chief ~~Risk~~Credit Officer. The working group is comprised of individuals from various functional areas including credit, risk management, finance and information technology, among others. We are currently ~~developing an~~working through our implementation plan ~~to include~~which includes assessment and documentation of processes, ~~portfolio segmentation,~~internal controls and data sources; model development, documentation and validation; and system ~~requirements and the identification of data and resource needs,~~configuration, among other things. We are also ~~currently evaluating selected~~in the process of implementing a third-party vendor ~~solutions~~solution to assist us in the application of ~~the~~ ASU 2016-13. The adoption of ~~the~~ ASU 2016-13 ~~is likely to~~could result in an increase in the allowance for loan losses as a result of changing from an “incurred loss” model, which encompasses allowances for current known and inherent losses within the portfolio, to an “expected loss” model, which encompasses allowances for losses expected to be incurred over the life of the portfolio. Furthermore, ASU 2016-13 will necessitate that we establish an allowance for expected credit losses onfor certain debt ~~securities.~~securities and other financial assets. While we are currently unable to reasonably estimate the impact of adopting ASU 2016-13, we expect that the impact of adoption will be significantly influenced by the composition, characteristics and quality of our loan and securities portfolios as well as the prevailing economic conditions and forecasts as of the adoption date.

~~ASU 2017-04, “Intangibles - Goodwill and Other (Topic 350) - Simplifying the Test for Goodwill Impairment.”~~ ASU 2017-04 eliminates Step 2 from the goodwill impairment test which required entities to compute the implied fair value of goodwill. Under ASU 2017-04, an entity should perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An entity should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. ASU 2017-04 will be effective for us on January 1, 2020, with early adoption permitted for interim or annual impairment tests beginning in 2017. ASU 2017-04 is not expected to have a significant impact on our financial statements.

ASU 2017-05, “Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20) - Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets.” ASU 2017-05 clarifies the scope of Subtopic 610-20 and adds guidance for partial sales of nonfinancial assets, including partial sales of real estate. Historically, U.S. GAAP contained several different accounting models to evaluate whether the transfer of certain assets qualified for sale treatment. ASU 2017-05 reduces the number of potential accounting models that might apply and clarifies which model does apply in various circumstances. ASU 2017-05 will be effective for us on January 1, 2018 and is not expected to have a significant impact on our financial statements.

ASU 2017-08,~~“Receivables~~ “Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20) - Premium Amortization on Purchased Callable Debt Securities.” ASU 2017-08 shortens the amortization period for certain callable debt securities held at a premium to require such premiums to be amortized to the earliest call date unless applicable guidance related to certain pools of securities is applied to consider estimated prepayments. Under prior guidance, entities were generally required to amortize premiums on individual, non-pooled callable debt securities as a yield adjustment over the contractual life of the security. ASU 2017-08 ~~does~~did not change the accounting for callable debt securities held at a discount. We adopted ASU 2017-08 ~~will be~~ effective ~~for us on~~ January 1, 2019 ~~with early adoption permitted. We are currently evaluating the potential impact of ASU 2017-08 on our financial statements.~~and recognized a cumulative effect adjustment reducing retained earnings by $12.6 million. See Note 1 - Significant Accounting Policies.

~~ASU 2017-09, “Compensation - Stock Compensation (Topic 718) - Scope of Modification Accounting.”~~ ASU 2017-09 clarifies when changes to the terms or conditions of a share-based payment award must be accounted for as modifications. Under ASU 2017-09, an entity will not apply modification accounting to a share-based payment award if all of the following are the same immediately before and after the change: (i) the award's fair value, (ii) the award's vesting conditions and (iii) the award's classification as an equity or liability instrument. ASU 2017-09 will be effective for us on January 1, 2018 and is not expected to have a significant impact on our financial statements.

ASU 2017-12, “Derivatives and Hedging (Topic 815) - Targeted Improvements to Accounting for Hedging Activities.”ASU 2017-12 amends the hedge accounting recognition and presentation requirements in ASC 815 to improve the transparency and understandability of information conveyed to financial statement users about an entity’s risk management activities to better align the entity’s financial reporting for hedging relationships with those risk management activities and to reduce the complexity of and simplify the application of hedge accounting. ASU 2017-12 ~~will be~~became effective for us on January 1, 2019 and isdid not ~~expected to~~ have a significant impact on our financial statements.

ASU 2018-16, “Derivatives and Hedging (Topic 815) - Inclusion of the Secured Overnight Financing Rate (“SOFR”) Overnight Index Swap (“OIS”) Rate as a Benchmark Interest Rate for Hedge Accounting Purposes.” The amendments in this update permit use of the OIS rate based on SOFR as a U.S. benchmark interest rate for hedge accounting purposes under Topic 815 in addition to the interest rates on direct U.S. Treasury obligations, the LIBOR swap rate, the OIS rate based on the Fed Funds Effective Rate and the Securities Industry and Financial Markets Association (“SIFMA”) Municipal Swap Rate. ASU 2018-16 became effective for us on January 1, 2019 and did not have a significant impact on our financial statements.

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

Financial Review

Cullen/Frost Bankers, Inc.

The following discussion should be read in conjunction with our consolidated financial statements, and notes thereto, for the year ended December 31, ~~2016~~2018, and the other information included in the ~~2016~~2018 Form 10-K. Operating results for the three ~~and nine~~ months ended ~~September 30, 2017~~March 31, 2019 are not necessarily indicative of the results for the year ending December 31, ~~2017~~2019 or any future period.

Dollar amounts in tables are stated in thousands, except for per share amounts.

Forward-Looking Statements and Factors that Could Affect Future Results

Certain statements contained in this Quarterly Report on Form 10-Q that are not statements of historical fact constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995 (the “Act”), notwithstanding that such statements are not specifically identified as such. In addition, certain statements may be contained in our future filings with the SEC, in press releases, and in oral and written statements made by us or with our approval that are not statements of historical fact and constitute forward-looking statements within the meaning of the Act. Examples of forward-looking statements include, but are not limited to: (i) projections of revenues, expenses, income or loss, earnings or loss per share, the payment or nonpayment of dividends, capital structure and other financial items; (ii) statements of plans, objectives and expectations of Cullen/Frost or its management or Board of Directors, including those relating to products, services or ~~services;~~operations; (iii) statements of future economic performance; and (iv) statements of assumptions underlying such statements. Words such as “believes”, “anticipates”, “expects”, “intends”, “targeted”, “continue”, “remain”, “will”, “should”, “may” and other similar expressions are intended to identify forward-looking statements but are not the exclusive means of identifying such statements.

Forward-looking statements involve risks and uncertainties that may cause actual results to differ materially from those in such statements. Factors that could cause actual results to differ from those discussed in the forward-looking statements include, but are not limited to:

Local, regional, national and international economic conditions and the impact they may have on us and our customers and our assessment of that impact.

Volatility and disruption in national and international financial and commodity markets.

Government intervention in the U.S. financial system.

Changes in the mix of loan geographies, sectors and types or the level of non-performing assets and charge-offs.

Changes in estimates of future reserve requirements based upon the periodic review thereof under relevant regulatory and accounting requirements.

The effects of and changes in trade and monetary and fiscal policies and laws, including the interest rate policies of the Federal Reserve Board.

Inflation, interest rate, securities market and monetary fluctuations.

The effect of changes in laws and regulations (including laws and regulations concerning taxes, banking, securities and insurance) with which we and our subsidiaries must comply.

The soundness of other financial institutions.

Political instability.

Impairment of our goodwill or other intangible assets.

Acts of God or of war or terrorism.

The timely development and acceptance of new products and services and perceived overall value of these products and services by users.

Changes in consumer spending, borrowings and savings habits.

Changes in the financial performance and/or condition of our borrowers.

Technological changes.

The cost and effects of failure, interruption, or breach of security of our systems.

Acquisitions and integration of acquired businesses.

Our ability to increase market share and control expenses.

Our ability to attract and retain qualified employees.

Changes in the competitive environment in our markets and among banking organizations and other financial service providers.

The effect of changes in accounting policies and practices, as may be adopted by the regulatory agencies, as well as the Public Company Accounting Oversight Board, the Financial Accounting Standards Board and other accounting standard setters.

Changes in the reliability of our vendors, internal control systems or information systems.

Changes in our liquidity position.

Changes in our organization, compensation and benefit plans.

The costs and effects of legal and regulatory developments, the resolution of legal proceedings or regulatory or other governmental inquiries, the results of regulatory examinations or reviews and the ability to obtain required regulatory approvals.

Greater than expected costs or difficulties related to the integration of new products and lines of business.

Our success at managing the risks involved in the foregoing items.

Forward-looking statements speak only as of the date on which such statements are made. We do not undertake any obligation to update any forward-looking statement to reflect events or circumstances after the date on which such statement is made, or to reflect the occurrence of unanticipated events.

Application of Critical Accounting Policies and Accounting Estimates

We follow accounting and reporting policies that conform, in all material respects, to accounting principles generally accepted in the United States and to general practices within the financial services industry. The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. While we base estimates on historical experience, current information and other factors deemed to be relevant, actual results could differ from those estimates.

We consider accounting estimates to be critical to reported financial results if (i) the accounting estimate requires management to make assumptions about matters that are highly uncertain and (ii) different estimates that management reasonably could have used for the accounting estimate in the current period, or changes in the accounting estimate that are reasonably likely to occur from period to period, could have a material impact on our financial statements. Accounting policies related to the allowance for loan losses are considered to be critical as these policies involve considerable subjective judgment and estimation by management.

For additional information regarding critical accounting policies, refer to Note 1 - Summary of Significant Accounting Policies and Note 3 - Loans in the notes to consolidated financial statements and the sections captioned “Application of Critical Accounting Policies and Accounting Estimates” and “Allowance for Loan Losses” in Management’s Discussion and Analysis of Financial Condition and Results of Operations included in the ~~2016~~2018 Form 10-K. There have been no significant changes in our application of critical accounting policies related to the allowance for loan losses since December 31, ~~2016~~2018.

Overview

A discussion of our results of operations is presented below. Certain reclassifications have been made to make prior periods comparable. Taxable-equivalent adjustments are the result of increasing income from tax-free loans and investments by an amount equal to the taxes that would be paid if the income were fully taxable based on ~~a 35%~~the applicable 21% federal tax rate in 2019 and 2018, thus making tax-exempt yields comparable to taxable asset yields.

Results of Operations

Net income available to common shareholders totaled ~~$91.1~~$114.5 million, or ~~$1.41 per diluted common share and $257.6 million, or $3.98~~$1.79 per diluted common share, for the three ~~and nine~~ months ended ~~September 30, 2017~~March 31, 2019 compared to ~~$78.2~~$104.5 million, or ~~$1.24 per diluted common share, and $214.5 million, or $3.42~~$1.61 per diluted common share, for the three ~~and nine~~ months ended ~~September 30, 2016.~~March 31, 2018.

Selected data for the comparable periods was as follows:


	Three Months Ended September 30,						Nine Months Ended September 30,						Three Months Ended March 31,
	2017			2016			2017			2016			2019			2018
Taxable-equivalent net interest income	$	264,406		$	235,665		$	774,819		$	694,997		$	271,179		$	252,536
Taxable-equivalent adjustment	45,195			41,158			132,311			120,264			24,710			22,788
Net interest income	219,211			194,507			642,508			574,733			246,469			229,748
Provision for loan losses	10,980			5,045			27,358			42,734			11,003			6,945
Net interest income after provision for loan losses	208,231			189,462			615,150			531,999			235,466			222,803
Non-interest income	81,615			82,114			246,395			256,274			96,785			91,445
Non-interest expense	186,823			180,505			562,789			539,109			201,800			196,611
Income before income taxes	103,023			91,071			298,756			249,164			130,451			117,637
Income taxes	9,892			10,852			35,131			28,622			13,955			11,157
Net income	93,131			80,219			263,625			220,542			116,496			106,480
Preferred stock dividends	2,016			2,016			6,047			6,047			2,016			2,016
Net income available to common shareholders	$	91,115		$	78,203		$	257,578		$	214,495		$	114,480		$	104,464
Earnings per common share – basic	$	1.43		$	1.24		$	4.02		$	3.44		$	1.80		$	1.63
Earnings per common share – diluted	1.41			1.24			3.98			3.42			1.79			1.61
Dividends per common share	0.57			0.54			1.68			1.61			0.67			0.57
Return on average assets	1.19		%	1.07		%	1.14		%	1.01		%	1.48		%	1.36		%
Return on average common equity	11.71			10.31			11.44			9.87			14.08			13.62
Average shareholders’ equity to average assets	10.63			10.85			10.43			10.70			10.97			10.46

Net income available to common shareholders increased ~~$12.9~~$10.0 million, or ~~16.5%~~9.6%, for the three months ended ~~September 30, 2017 and increased $43.1 million, or 20.1% for the nine months ended September 30, 2017~~March 31, 2019 compared to the same ~~periods~~period in ~~2016.~~2018. The increase during the three months ended ~~September 30, 2017~~March 31, 2019 was primarily the result of a ~~$24.7~~$16.7 million increase in net interest income and a ~~$960 thousand decrease~~$5.3 million increase in non-interest income ~~tax expense~~ partly offset by a ~~$6.3~~$5.2 million increase in non-interest expense, a ~~$5.9~~$4.1 million increase in the provision for loan losses and a $499 thousand decrease in non-interest income. The increase during the nine months ended September 30, 2017 was primarily the result of a $67.8 million increase in net interest income and a $15.4 million decrease in the provision for loan losses partly offset by a $23.7 million increase in non-interest expense, a $9.9 million decrease in non-interest income and a $6.5$2.8 million increase in income tax expense.

Details of the changes in the various components of net income are further discussed below.

During the third quarter of 2017, our operations in our Houston and Corpus Christi market areas were disrupted by hurricane Harvey. As a result, we incurred certain additional expenses, as discussed below; lost potential revenue as a result of branch closures; and allocated a portion of our allowance for loan losses for probable losses related to the impact of the hurricane, as discussed below. While the ultimate impact of the hurricane on our operations is uncertain, we expect that it will be mitigated, at least in part, by insurance coverage and, based on the information available to us at this time, we do not expect any significant impact on our financial statements.

Net Interest Income

Net interest income is the difference between interest income on earning assets, such as loans and securities, and interest expense on liabilities, such as deposits and borrowings, which are used to fund those assets. Net interest income is our largest source of revenue, representing ~~72.3%~~71.8% of total revenue during the first ~~nine~~three months of ~~2017.~~2019. Net interest margin is the ratio of taxable-equivalent net interest income to average earning assets for the period. The level of interest rates and the volume and mix of earning assets and interest-bearing liabilities impact net interest income and net interest margin.

The Federal Reserve influences the general market rates of interest, including the deposit and loan rates offered by many financial institutions. Our loan portfolio is significantly affected by changes in the prime interest rate. The prime ~~interest~~ rate ~~which is the rate offered on loans to borrowers with strong credit, remained~~began 2018 at ~~3.50% during most of 2016. In December 2016, the prime rate increased 25 basis points to 3.75%~~4.50% and remained at that level until March ~~2017,~~2018, when ~~the prime rated~~it increased

~~another~~ 25 basis points to ~~4.00%~~4.75%. ~~In June 2017,~~During the remainder of 2018, the prime rate increased an additional 2575 basis points (25 basis points in each of June, September and December) to ~~4.25%~~end 2018 at 5.50%. The prime rate did not change during the first three months of 2019. Our loan portfolio is also impacted by changes in the London Interbank Offered Rate (LIBOR). At ~~September 30, 2017,~~March 31, 2019, the one-month and three-month U.S. dollar LIBOR interest rates were ~~1.23%~~2.50% and ~~1.33%~~2.60%, respectively, while at ~~September 30, 2016,~~March 31, 2018, the one-month and three-month U.S. dollar LIBOR interest rates were ~~0.53%~~1.89% and ~~0.85%~~2.31%, respectively. The effective federal funds rate, which is the cost of immediately available overnight funds, ~~remained~~began 2018 at ~~0.50% during most of 2016. In December 2016, the effective federal funds rate increased 25 basis points to 0.75%~~1.50% and remained at that level until March ~~2017,~~2018, when it increased 25 basis points to 1.75%. During the remainder of 2018 the effective federal funds rate increased ~~another 25~~75 basis points (25 basis points in each of June, September, and December) to ~~1.00%~~end 2018 at 2.50%. ~~In June 2017, the~~The effective federal funds rate ~~was increased an additional 25 basis points to 1.25%.~~did not change during the first three months of 2019.

We are primarily funded by core deposits, with non-interest-bearing demand deposits historically being a significant source of funds. This lower-cost funding base is expected to have a positive impact on our net interest income and net interest margin in

a rising interest rate environment. The Dodd-Frank Wall Street Reform and Consumer Protection Act (the “Dodd-Frank Act”) repealed the federal prohibitions on the payment of interest on demand deposits, thereby permitting depository institutions to pay interest on business transaction and other accounts beginning July 21, 2011. To date, we have not experienced any significant additional interest costs as a result of the repeal. However, ~~in light of the aforementioned increases in~~as market interest rates ~~in late July 2017,~~have increased, we have increased the interest rates we pay on most of our interest-bearing deposit products. See Item 3. Quantitative and Qualitative Disclosures About Market Risk elsewhere in this report for information about the expected impact of this legislation on our sensitivity to interest rates. Further analysis of the components of our net interest margin is presented below.

The following ~~tables present~~table presents the changes in taxable-equivalent net interest income and identifies the changes due to differences in the average volume of earning assets and interest-bearing liabilities and the changes due to changes in the average interest rate on those assets and liabilities. The changes in net interest income due to changes in both average volume and average interest rate have been allocated to the average volume change or the average interest rate change in proportion to the absolute amounts of the change in each. The comparison between the periods includes an additional change factor that shows the effect of the difference in the number of days in each period for assets and liabilities that accrue interest based upon the actual number of days in the period, as further discussed below.

Three Months Ended
September 30, 2017 vs. September 30, 2016
Increase (Decrease) Due to Change in
Rate Volume Number of Days Total
Interest-bearing deposits $ 6,472
$ 217
$ —
$ 6,689
Federal funds sold and resell agreements 75
121
—
196
Securities:
Taxable (1,176 ) (1,518 ) —
(2,694 )
Tax-exempt (3,239 ) 7,234
—
3,995
Loans, net of unearned discounts 13,650
12,298
—
25,948
Total earning assets 15,782
18,352
—
34,134
Savings and interest checking —
83
—
83
Money market deposit accounts 3,339
4
—
3,343
Time accounts 147
(13 ) —
134
Public funds 362
(3 ) —
359
Federal funds purchased and repurchase agreements 467
12
—
479
Junior subordinated deferrable interest debentures 181
—
—
181
Subordinated notes payable and other notes 819
(5 ) —
814
Total interest-bearing liabilities 5,315
78
—
5,393
Net change $ 10,467
$ 18,274
$ —
$ 28,741


	Nine Months Ended												Three Months Ended
	September 30, 2017 vs. September 30, 2016												March 31, 2019 vs. March 31, 2018
	Increase (Decrease) Due to Change in												Increase (Decrease) Due to Change in
	Rate			Volume			Number of Days			Total			Rate			Volume			Total
Interest-bearing deposits	$	13,757		$	1,630		$	(41	)	$	15,346		$	6,265		$	(9,720	)	$	(3,455	)
Federal funds sold and resell agreements	202			148			(1		)	349			511			316			827
Securities:
Taxable	(4,440		)	(726		)	(204		)	(5,370		)	2,183			1,938			4,121
Tax-exempt	(9,516		)	32,818			—			23,302			(1,719		)	5,860			4,141
Loans, net of unearned discounts	28,934			25,851			(1,257		)	53,528			23,348			10,935			34,283
Total earning assets	28,937			59,721			(1,503		)	87,155			30,588			9,329			39,917
Savings and interest checking	—			117			(3		)	114			312			23			335
Money market deposit accounts	3,391			6			(13		)	3,384			12,835			107			12,942
Time accounts	231			(41		)	(3		)	187			2,005			167			2,172
Public funds	721			(6		)	—			715			870			217			1,087
Federal funds purchased and repurchase agreements	638			60			(1		)	697			4,296			86			4,382
Junior subordinated deferrable interest debentures	497			1			—			498			356			—			356
Subordinated notes payable and other notes	1,875			(137		)	—			1,738			—			—			—
Total interest-bearing liabilities	7,353			—			(20		)	7,333			20,674			600			21,274
Net change	$	21,584		$	59,721		$	(1,483	)	$	79,822		$	9,914		$	8,729		$	18,643

Taxable-equivalent net interest income for the three months ended ~~September 30, 2017~~March 31, 2019 increased ~~$28.7~~$18.6 million, or ~~12.2%, while taxable-equivalent net interest income for the nine months ended September 30, 2017 increased $79.8 million, or 11.5%~~7.4%, compared to the same periods in ~~2016. Taxable-equivalent net interest income for the nine months ended September 30, 2017 included 273 days compared to 274 days for the same period in 2016 as a result of the leap year.~~2018. The additional day added approximately $1.5 million to taxable-equivalent net interest income during the nine months ended September 30, 2016. Excluding the impact of the additional day results in an effective increase ~~in taxable-equivalent net interest income of approximately $81.3 million during the nine months ended September 30, 2017. The increases~~ in taxable-equivalent net interest income during the ~~three and nine months ended September 30, 2017, excluding the impact~~first quarter of ~~the aforementioned additional day during the nine months ended September 30, 2016, were~~2019 was primarily related to ~~the impact of increases in the average volume of tax-exempt securities, loans and interest-bearing deposits as well as~~ increases in the average yields on loans, ~~and~~ interest-bearing deposits ~~partly offset by the impact of decreases in the average yields on tax-exempt~~ and taxable securities ~~and the impact of~~combined with increases in the average ~~rate~~volumes of loans, tax-exempt securities and taxable securities. The impact of these items was partly offset by increases in the average rates paid on interest-bearing ~~liabilities.~~ deposits and other borrowed funds and a decrease in the average volume of interest bearing deposits (primarily excess reserves held in an interest-bearing account at the Federal Reserve).

The average volume of interest-earning assets for the three months ended ~~September 30, 2017 increased $1.3 billion, while the average volume of interest-earning assets during the nine months ended September 30, 2017 increased $1.7 billion~~March 31, 2019 decreased $48.0 million compared to the same ~~periods~~period in ~~2016.~~2018. The ~~increase~~decrease included a $1.9 billion decrease in average ~~earning assets during the three months ended September 30, 2017, included~~interest-bearing deposits, federal funds sold and resell agreements partly offset by a ~~$1.1 billion~~$910.6 million increase in average loans, a ~~$377.0~~$558.2 million increase in average tax-exempt securities and a ~~$161.3~~$373.4 million increase in average interest-bearing deposits partly offset by a $421.2 million decrease in average taxable securities. The increase in average earning assets during the nine months ended September 30, 2017, included an $821.8 million increase in average loans, a $648.9 million increase in average tax-exempt securities and a $384.9 million increase in average interest-bearing deposits partly offset by a $133.6 million decrease in average taxable securities.

The taxable-equivalent net interest margin increased 2027 basis points from ~~3.53%~~3.52% during the three months ended ~~September 30, 2016~~March 31, 2018 to ~~3.73%~~3.79% during the three months ended ~~September 30, 2017 and increased 13 basis points from 3.56% during~~March 31, 2019. The increase in the ~~nine months ended September 30, 2016 to 3.69% during the nine months ended September 30, 2017. The increases in the~~taxable-equivalent net interest margin ~~during the three and nine months ended September 30, 2017 were~~was primarily due to increases in the average yield on interest earning assets. The average yield on interest-earning assets increased 28 basis points from 3.57% during the three months ended September 30, 2016 to 3.85% during the three months ended September 30, 2017 and increased 17 basis points from 3.60% during the nine months ended September 30, 2016 to 3.77% during the nine months ended September 30, 2017. The increases in the average yield on interest earning assets during the three and nine months ended September 30, 2017 were mostly duerelated to increases in the average yields on loans; interest-bearing deposits; federal funds sold and resell agreements; and taxable securities partly offset by increases in the average cost of interest-bearing deposits and ~~loans.~~other borrowed funds and a decrease in the average yield on tax-exempt securities. The taxable-equivalent net interest margin was also positively impacted by a decrease in the relative proportion of interest-earning assets invested in lower-yielding interest-bearing deposits (primarily excess reserves held in an interest-bearing account at the Federal Reserve). The average taxable-equivalent yield on interest-earning assets isincreased 56 basis points from 3.71% during the three months ended March 31, 2018 to 4.27% during the three months ended March 31, 2019. The average taxable-equivalent yield on interest-earning assets was primarily impacted by the aforementioned changes in market interest rates, ~~as well as~~ changes in the volume and relative mix of interest-earning ~~assets.~~assets and statutory tax rates.

The average taxable-equivalent yield on loans increased 3268 basis points from ~~4.00%~~4.65% during the ~~first nine~~three months ~~of 2016~~ended March 31, 2018 to ~~4.32%~~5.33% during the ~~first nine~~three months ~~of 2017.~~ended March 31, 2019. The average taxable-equivalent yield on loans was positively impacted by the increases in market interest rates ~~compared to the same period in 2016, as~~ discussed above. The average volume of loans ~~during~~for the ~~first nine~~three months ~~of 2017~~ended March 31, 2019 increased ~~$821.8~~$910.6 million, or ~~7.1%~~6.8%, compared to the same period in ~~2016.~~2018. Loans made up approximately ~~43.8%~~49.1% of average interest-earning assets during the ~~first nine~~three months ~~of 2017~~ended March 31, 2019 compared to ~~43.6%~~45.8% during the same period in ~~2016.~~

2018.

The average taxable-equivalent yield on securities was ~~3.96%~~3.37% during the ~~first nine~~three months ~~of 2017, decreasing 5 basis points from 4.01%~~ended March 31, 2019, remaining relatively unchanged compared to the 3.36% during the ~~first nine~~same period in 2018. The average taxable-equivalent yield on securities during the three months ended March 31, 2019 compared to the same period in 2018 was positively impacted by increases in the average volume of ~~2016. Despite the fact that~~tax-exempt and taxable securities and an increase in the average yield on taxable securities ~~decreased 12 basis points from 2.02% during the first nine months of 2016 to 1.90% during the first nine months of 2017 and~~but was negatively impacted by a decrease in the average yield on tax-exempt ~~securities decreased 19 basis point from 5.58% during the first nine months of 2016 to 5.39% during the first nine months of 2017, the overall~~securities. The average yield on taxable securities ~~only decreased 5~~increased 20 basis points ~~because of a higher proportion of~~from 1.99% during the three months ended March 31, 2018 to 2.19% during the three months ended March 31, 2019. The average ~~securities invested in higher yielding~~taxable-equivalent yield on tax-exempt securities decreased 9 basis points from 4.12% during the ~~first nine~~three months ~~of 2017 compared~~ended March 31, 2018 to 4.03% during the ~~same period in 2016.~~three months ended March 31, 2019. Tax exempt securities made up approximately ~~58.8%~~64.4% of total average securities during the ~~first nine~~three months ~~of 2017,~~ended March 31, 2019, compared to ~~55.9%~~64.8% during the same period in ~~2016.~~2018. The average volume of total securities during the ~~first nine~~three months ~~of 2017~~ended March 31, 2019 increased ~~$515.3~~$931.7 million, or ~~4.3%~~7.9%, compared to the same period in ~~2016.~~2018. Securities made up approximately 44.1% of average interest-earning assets during the ~~first nine~~three months ~~of 2017~~ended March 31, 2019 compared to ~~45.1%~~40.8% during the same period in ~~2016.~~2018.

Average interest-bearing deposits, federal funds sold and resell agreements ~~and interest-bearing deposits during~~for the ~~first nine~~three months ~~of 2017 increased $407.3 million~~ended March 31, 2019 decreased $1.9 billion, or 48.9%, compared to the same period in ~~2016.The increase in average~~2018. Interest-bearing deposits, federal funds sold and resell agreements ~~and interest-bearing deposits was primarily related to growth in average deposits. Federal funds sold, resell agreements and interest-bearing deposits~~ made up approximately ~~12.1%~~6.8% of average interest-earning assets during the ~~first nine~~three months ~~of 2017~~ended March 31, 2019 compared to ~~11.3%~~13.4% during the three months ended March 31, 2018. The decrease in the average volume of interest-bearing deposits, federal funds sold and resell agreements was primarily due to a decrease in the average volume of our excess reserves held in an interest-bearing account at the Federal Reserve during the first quarter of 2019 compared to the same period in 2018 as such funds were invested in higher yielding loans and securities. The volume of interest-bearing deposits, federal funds sold and resell agreements was also impacted by a decrease in the average volume of deposits during the first quarter of 2019 compared to the same period in 2018. The combined average yield on interest-bearing deposits, federal funds sold and resell agreements was 2.51% during the three months ended March 31, 2019 compared to 1.56% during the same period in ~~2016. The combined average yield on federal funds sold, resell agreements and interest-bearing deposits was 1.07% during the first nine months of 2017 compared to 0.51% during the same period in 2016.~~2018. As discussed above, the effective federal funds rate began 2018 at 1.50% and subsequently increased ~~from 0.50%~~100 basis points (25 basis points in each of March, June, September and December) to ~~0.75% in December 2016, increased from 0.75% to 1.00% in~~end 2018 at 2.50%, where it remained through March ~~2017 and increased from 1.00% to 1.25% in June 2017.~~31, 2019.

The average rate paid on interest-bearing liabilities was ~~0.13%~~0.81% during the ~~first nine~~three months ~~of 2017,~~ended March 31, 2019 increasing 548 basis points from ~~0.08%~~0.33% during the same period in ~~2016.~~2018. Average deposits ~~increased $1.5 billion~~decreased $317.3 million, or 1.20%, during the ~~first nine~~three months ~~of 2017~~ended March 31, 2019 compared to the same period in ~~2016. Average non-interest-bearing~~2018 and included a $779.8 million decrease in average non-interest bearing deposits ~~for the first nine months of 2017 increased $832.2~~partly offset by a $462.5 million ~~compared to the same period~~increase in ~~2016, while~~ average interest-bearing ~~deposits for the first nine months of 2017 increased $699.7 million compared to the same period in 2016.~~deposits. The ratio of average interest-bearing deposits to total average deposits was ~~58.3%~~61.0% during the ~~first nine~~three months ~~of 2017~~ended March 31, 2019 compared to ~~59.1%~~58.5% during the same period ~~in 2016.~~of 2018. The average cost of deposits is primarily impacted by changes in market interest rates as well as changes in the volume and relative mix of interest-bearing deposits. The average cost of interest-bearing deposits and total deposits was ~~0.09%~~0.69% and ~~0.05%~~0.42%, respectively, during the ~~first nine~~three months ~~of 2017~~ended March 31, 2019 compared to ~~0.05%~~0.28% and ~~0.03%~~0.16%, respectively, during the ~~first nine~~three months ~~of 2016.~~ended March 31, 2018. The average cost of deposits during ~~2017~~2019 was impacted by ~~the aforementioned~~ increases in the interest rates ~~paid~~we pay on most of our interest-bearing deposit products ~~during~~as a result of the ~~third quarter.~~aforementioned increases in market interest rates and market competition.

Our net interest spread, which represents the difference between the average rate earned on earning assets and the average rate paid on interest-bearing liabilities, was ~~3.64%~~3.46% during the ~~first nine~~three months ~~of 2017~~ended March 31, 2019 compared to ~~3.52%~~3.38% during ~~the~~ same period in ~~2016.~~2018. The net interest spread, as well as the net interest margin, will be impacted by future changes in short-term and long-term interest rate levels, as well as the impact from the competitive environment. A discussion of the effects of changing interest rates on net interest income is set forth in Item 3. Quantitative and Qualitative Disclosures About Market Risk included elsewhere in this report.

Our hedging policies permit the use of various derivative financial instruments, including interest rate swaps, swaptions, caps and floors, to manage exposure to changes in interest rates. Details of our derivatives and hedging activities are set forth in Note 98 - Derivative Financial Instruments in the accompanying notes to consolidated financial statements included elsewhere in this report. Information regarding the impact of fluctuations in interest rates on our derivative financial instruments is set forth in Item 3. Quantitative and Qualitative Disclosures About Market Risk included elsewhere in this report.

Provision for Loan Losses

The provision for loan losses is determined by management as the amount to be added to the allowance for loan losses after net charge-offs have been deducted to bring the allowance to a level which, in management’s best estimate, is necessary to absorb inherent losses within the existing loan portfolio. The provision for loan losses totaled $11.0 million ~~and $27.4~~for the three months ended March 31, 2019 compared to $6.9 million for the three ~~and nine~~ months ended ~~September 30, 2017 compared to $5.0 million and $42.7 million for the three and nine months ended September 30, 2016.~~March 31, 2018. See the section captioned “Allowance for Loan Losses” elsewhere in this discussion for further analysis of the provision for loan losses.

Non-Interest Income

The components of non-interest income were as follows:


	Three Months Ended September 30,						Nine Months Ended September 30,					Three Months Ended March 31,
	2017			2016			2017			2016		2019		2018
Trust and investment management fees	$	27,493		$	26,451		$	81,690		$	77,806	$	31,697	$	29,587
Service charges on deposit accounts	20,967			20,540			62,934			60,769		20,790		20,843
Insurance commissions and fees	10,892			11,029			34,441			35,812		18,406		15,980
Interchange and debit card transaction fees	5,884			5,435			17,150			15,838		3,280		3,158
Other charges, commissions and fees	10,493			10,703			29,983			29,825		9,062		9,007
Net gain (loss) on securities transactions	(4,867		)	(37		)	(4,917		)	14,866		—		(19		)
Other	10,753			7,993			25,114			21,358		13,550		12,889
Total	$	81,615		$	82,114		$	246,395		$	256,274	$	96,785	$	91,445

Total non-interest income for the three ~~and nine~~ months ended ~~September 30, 2017 decreased $499 thousand, or 0.6% and decreased $9.9~~March 31, 2019 increased $5.3 million, or ~~3.9%~~5.8%, compared to the same periods in 2016, respectively. Excluding the impact of the net gain (loss) on securities transactions, total non-interest income effectively increased $4.3 million, or 5.3%, and $9.9 million, or 4.1%, respectively, for the three and nine months ended September 30, 2017 compared to the same period in ~~2016.~~2018. Changes in the various components of non-interest income are discussed in more detail below.

Trust and Investment Management Fees. Trust and investment management fees for the three ~~and nine~~ months ended ~~September 30, 2017~~March 31, 2019 increased ~~$1.0~~$2.1 million, or ~~3.9%, and increased $3.9 million, or 5.0%~~7.1%, compared to the same ~~periods~~period in ~~2016, respectively.~~2018. Investment fees are the most significant component of trust and investment management fees, making up approximately ~~83.5%~~83.2% and ~~81.6%~~84.0% of total trust and investment management fees for the first ~~nine~~three months of ~~2017~~2019 and ~~2016,~~2018, respectively. Investment and other custodial account fees are generally based on the market value of assets within a trust account. Volatility in the equity and bond markets impacts the market value of trust assets and the related investment fees.

The increase in trust and investment management fees during the three ~~and nine~~ months ended ~~September 30, 2017~~March 31, 2019 compared to the same ~~period~~periods in ~~2016~~2018 was primarily the result of increases in trust investment fees (up ~~$1.6 million~~$1.5 million) and ~~$4.7 million, respectively)~~increases in oil and gas fees (up $598 thousand). The increase in trust investment fees during ~~2017~~2019 was due to higher average equity ~~valuations.~~valuations and an increase in the number of accounts. The ~~increases~~increase in ~~trust investment fees were partly offset by decreases in estate fees (down $212 thousand and $537 thousand during the three and nine months ended September 30, 2017, respectively) and~~ oil and gas fees ~~(down $294 thousand~~during 2019 was related to energy prices and ~~$159 thousand during the three and nine months ended September 30, 2017, respectively).~~new business, partly driven by enhancements to our service offering.

At ~~September 30, 2017,~~March 31, 2019, trust assets, including both managed assets and custody assets, were primarily composed of equity securities ~~(49.6%~~(50.0% of assets), fixed income securities ~~(39.1%~~(37.1% of assets) and cash equivalents ~~(6.9%~~(7.3% of assets). The estimated fair value of these assets was ~~$31.0~~$35.0 billion (including managed assets of ~~$13.9~~$15.0 billion and custody assets of ~~$17.2~~$20.0 billion) at ~~September 30, 2017,~~March 31, 2019, compared to ~~$29.3~~$33.3 billion (including managed assets of ~~$13.4~~$14.7 billion and custody assets of ~~$15.9~~$18.7 billion) at December 31, ~~2016~~2018 and ~~$29.7~~$32.9 billion (including managed assets of ~~$13.3~~$14.2 billion and custody assets of ~~$16.4~~$18.7 billion) at ~~September 30, 2016.~~March 31, 2018.

Service Charges on Deposit Accounts. Service charges on deposit accounts for the three months ended ~~September 30, 2017 increased $427~~March 31, 2019 decreased $53 thousand, or ~~2.1%~~0.3%, compared to the same period in ~~2016.~~2018. The ~~increase~~decrease was primarily ~~due~~related to increases in consumer service charges (up $429 thousand) and overdraft/insufficient funds charges on consumer and commercial accounts (up $315 thousand and $62 thousand, respectively) partly offset by a decrease in commercial service charges (down ~~$368~~$875 thousand)~~. Service charges on deposit accounts for the nine months ended September 30, 2017 increased $2.2 million, or 3.6%, compared to the same period in 2016. The increase was primarily due to~~ mostly offset by increases in overdraft/insufficient funds charges on consumer and commercial accounts (up ~~$1.6 million~~$693 thousand and ~~$361~~$85 thousand, respectively) and consumer service charges (up ~~$451~~$57 thousand) ~~partly offset by a~~. The decrease in commercial service charges ~~(down $221 thousand).~~was primarily due to a decrease in commercial deposit volumes during the first quarter of 2019 compared to the same period in 2018. Overdraft/insufficient funds charges totaled ~~$8.7~~$9.6 million ($~~6.8~~7.4 million consumer and ~~$2.0~~$2.2 million commercial) during the three months ended ~~September 30, 2017~~March 31, 2019 compared to ~~$8.4~~$8.8 million ($~~6.5~~6.8 million consumer and ~~$1.9~~$2.1 million commercial) during the same period in ~~2016. Overdraft/~~2018. The increase in overdraft/insufficient funds charges ~~totaled $25.9 million ($20.0 million consumer and $5.9 million commercial)~~was primarily due to increased transactions volumes during the ~~nine months ended September 30, 2017~~first quarter of 2019 compared to ~~$23.9 million ($18.4 million consumer and $5.5 million commercial) during~~ the same period in ~~2016.~~2018.

Insurance Commissions and Fees. Insurance commissions and fees for the three months ended ~~September 30, 2017 decreased $137 thousand,~~March 31, 2019 increased $2.4 million, or ~~1.2%~~15.2%, compared to the same period in ~~2016.~~2018. The ~~decrease~~increase was related to increases in commission income (up $2.6 million) partly offset by a decrease in contingent income (down ~~$212~~$189 thousand) ~~partly offset by an~~. The increase in commission income ~~(up $75 thousand). Insurance~~during the three months ended March 31, 2019 was primarily related to increases in benefit plan commissions; commissions on property; and casualty policies and life insurance commissions. The increases in benefit plan commissions and ~~fees for the nine months ended September 30, 2017 decreased $1.4 million, or 3.8%, compared to the same period in 2016. The decrease was~~property and

casualty commissions were related to ~~a decrease in contingent income (down $2.7 million) partly offset by an~~increased business volumes and market rates. The increase in ~~commission income (up $1.3 million).~~life insurance commissions was related to increased business volumes. Insurance commissions and fees include contingent income totaling ~~$358 thousand~~$3.2 million during the three months ended March 31, 2019 and $3.4 million during the ~~three and nine months ended September 30, 2017, respectively, and $570 thousand and $6.1 million during the~~ same ~~periods~~period in ~~2016.~~2018. Contingent income primarily consists of amounts received from various property and casualty insurance carriers related to the loss performance of insurance policies previously placed. These performance related contingent payments are seasonal in nature and are mostly received during the first quarter of each year. This performance related contingent income totaled ~~$2.1~~$2.6 million and ~~$4.6~~$2.9 million during the ~~nine~~three months ended ~~September 30, 2017~~March 31, 2019 and ~~2016,~~2018, respectively. The decrease in performance related contingent income during ~~2017~~2019 was related to ~~a lack of~~lower growth within the portfolio ~~and a deterioration~~partly offset by the impact of improvement in the loss performance of insurance policies previously placed. Contingent income also includes amounts received from various benefit plan insurance companies related to the volume of business generated and/or the subsequent retention of such business. This benefit plan related contingent income totaled ~~$311~~$603 thousand ~~and $1.3 million~~ during the three ~~and nine~~ months ended ~~September 30, 2017~~March 31, 2019, and ~~$417~~$552 thousand ~~and $1.5 million~~ during the ~~three and nine months ended September 30, 2016. The increases~~same period in commission income during the three and nine months ended September 30, 2016 were primarily related to increases in benefit plan commissions due to increased business volumes partly offset by decreases in commissions on property and casualty policies.2018.

Interchange and Debit Card Transaction Fees. Interchange fees, or “swipe” fees, are charges that merchants pay to us and other card-issuing banks for processing electronic payment transactions. Interchange and debit card transaction fees consist of income from check card usage, point of sale income from PIN-based debit card transactions and ATM service fees. Interchange and debit card transaction fees are reported net of related network costs. A comparison of gross and net interchange and debit card transaction fees for the ~~three~~reported periods is presented in the table below:



	Three Months Ended March 31,
	2019		2018
Income from debit card transactions	$	5,405	$	5,124
ATM service fees	981		947
Gross interchange and debit card transaction fees	6,386		6,071
Network costs	3,106		2,913
Net interchange and debit card transaction fees	$	3,280	$	3,158

The increase in interchange and nine months ended September 30, 2017 increased $449 thousand, or 8.3%, and $1.3 million, or 8.3%, compared to the three and nine months ended September 30, 2016. The increases were primarily due to increases in income from debit card ~~transactions (up $381 thousand and $1.0 million for the three and nine months ended September 30, 2017, respectively) and ATM service~~transaction fees ~~(up $68 thousand and $267 thousand for the three and nine months ended September 30, 2017, respectively). The increases were~~during 2019, on a net basis, was primarily related to increased transaction volumes.

Federal Reserve rules applicable to financial institutions that have assets of $10 billion or more provide that the maximum permissible interchange fee for an electronic debit transaction is the sum of 21 cents per transaction and 5 basis points multiplied by the value of the transaction. An upward adjustment of no more than 1 cent to an issuer's debit card interchange fee is allowed if the card issuer develops and implements policies and procedures reasonably designed to achieve certain fraud-prevention standards. The Federal Reserve also has rules governing routing and exclusivity that require issuers to offer two unaffiliated networks for routing transactions on each debit or prepaid product.

Other Charges, Commissions and Fees. Other charges, commissions and fees for the three months ended ~~September 30, 2017 decreased $210~~March 31, 2019 increased $55 thousand, or ~~2.0%~~0.6%, compared to the same period in ~~2016.~~2018. The ~~decrease included~~increase was primarily related to increases in income from the sale of life insurance and money market accounts (up $375 thousand and $316 thousand, respectively) mostly offset by decreases in ~~human resources consulting fee income (down $160 thousand) and~~ income from ~~corporate finance and capital market advisory services (down $109 thousand), among other things. These items were partly offset by an increase in income related to~~ the sale of mutual funds ~~(up $128~~and annuities (down $276 thousand and $195 thousand, respectively) and brokerage commissions (down $196 thousand), among other things. Other charges, commissions and fees for the nine months ended September 30, 2017 increased $158 thousand, or 0.5%, compared to the same period in 2016. The increase included increases in income related to the sale of mutual funds (up $911 thousand) and wire transfer fees (up $235 thousand), among other things. These items were partly offset by decreases in human resources consulting fee income (down $486 thousand) and income from corporate finance and capital market advisory services (down $476 thousand), among other things. Human resources consulting fee income decreased as we no longer provide these services. Changes in the other aforementioned categories of other charges, commissions and fees were due to fluctuations in business volumes..

Net Gain/Loss on Securities Transactions. During the ~~nine~~three months ended ~~September 30, 2017,~~March 31, 2019, and 2018, we sold certain available-for-sale U.S Treasury securities with an amortized ~~cost~~costs totaling ~~$8.2~~$944.9 million and $3.0 billion, ~~and~~respectively. No significant net gain or loss was realized on the 2019 sales while we realized a net loss ~~of $50~~totaling $19 thousand on ~~those~~the 2018 sales. The sales were primarily related to securities purchased ~~during 2017~~ and subsequently sold in the same period of their purchase in connection with our tax planning strategies related to the Texas franchise tax. The gross proceeds from the sales of these securities outside of Texas are included in total revenues/receipts from all sources reported for Texas franchise tax purposes, which results in a reduction in the overall percentage of revenues/receipts apportioned to Texas and subjected to taxation under the Texas franchise tax. We also sold, during the third quarter of 2017, certain other available-for-sale U.S. Treasury securities with an amortized cost totaling $751.4 million and realized a net loss of $4.9 million on those sales. These securities were sold with the intent to reinvest the sales proceeds in higher yielding debt securities and other investments.

During the nine months ended September 30, 2016, we sold certain available-for sale U.S. Treasury securities with an amortized cost totaling $8.0 billion and realized a net loss of $37 thousand on those sales. The sales were primarily related to securities purchased during 2016 and subsequently sold in connection with our aforementioned tax planning strategies related to the Texas franchise tax. We also sold certain other available-for-sale U.S. Treasury securities with an amortized cost totaling $749.5 million and realized a net gain of $2.8 million on those sales. The securities sold were due to mature during 2016. Most of the proceeds from the sale of these securities were reinvested into U.S. Treasury securities having comparable yields, but longer-terms. During the nine months ended September 30, 2016, we also sold certain municipal securities that were classified as both available for

sale and held to maturity due to a significant deterioration in the creditworthiness of the issuers. These securities had a total amortized cost of $431.4 million and we realized a gain of $12.1 million on those sales. Refer to our 2016 Form 10-K for additional information related to these sales.

Other Non-Interest Income. Other non-interest income for the three months ended ~~September 30, 2017~~March 31, 2019 increased ~~$2.8 million,~~$661 thousand, or ~~34.5%~~5.1%, compared to the same period in ~~2016.~~2018. The increase during the three months ended March 31, 2019 was primarily related to increases in sundry and other miscellaneous income (up ~~$1.1 million), income from customer derivative and trading activities (up $935 thousand), gains on the sale of foreclosed and other assets (up $724~~$802 thousand) and ~~income from customer foreign currency transactions~~public finance underwriting fees (up ~~$248~~$535 thousand)~~. Sundry and other miscellaneous income during the three months ended September 30, 2017 included $1.2 million related to the collection of amounts charged-off~~ partly offset by Western National Bank prior to our acquisition and $426 thousand related to recoveries of prior write-offs, among other things, while sundry and other miscellaneous income during the same period in 2016 included $453 thousand related to recoveries of prior write-offs, among other things. The fluctuationsa decrease in income from customer derivative and trading activities (down $889 thousand). Sundry income during the three months ended March 31, 2019 included $931 thousand related to the recovery of interest written-off prior to 2019 and $250 thousand related to a settlement, among other things. The fluctuations in public finance underwriting fees income and income from customer ~~foreign currency transactions~~derivative and trading activities during the three months ended March 31, 2019 were primarily related to changes in business volumes. ~~During the third quarter of 2017,~~Other non-interest income also included gains on the sale of ~~foreclosed~~various branch and ~~other assets included $700 thousand related to amortization of~~operational facilities totaling $4.0 million during the ~~deferred gain on our headquarters building, which we sold in December 2016.~~

~~Other non-interest income for the nine~~three months ended ~~September 30, 2017 increased $3.8~~March 31, 2019 and $3.7 million or 17.6%, compared to the same period in 2016. The increase was primarily related to increases in gains on the sale of foreclosed and other assets (up $1.5 million), sundry and other miscellaneous income (up $1.5 million), income from customer foreign currency transactions (up $497 thousand) and income from customer derivative and trading activities (up $422 thousand), among other things, partly offset by decreases in lease rental income (down $384 thousand) and earnings on the cash surrender value of life insurance policies (down $311 thousand), among other things. Sundry income during the nine months ended September 30, 2017 included the aforementioned $1.2 million related to the collection of amounts charged-off by Western National Bank prior to our acquisition, $864 thousand related to the settlement of a non-solicitation agreement and $541 thousand related to recoveries of prior write-offs among other things, while sundry and other miscellaneous income during the same period in 2016 included $1.1 million related to recoveries of prior write-offs, among other things. The fluctuations in income from customer foreign currency transactions and income from customer derivative and trading activities were primarily related to changes in business volumes. During the first nine months of 2017, gains on the sale of foreclosed and other assets included $2.2 million related to amortization of the aforementioned deferred gain on our headquarters building.2018.

Non-Interest Expense

The components of non-interest expense were as follows:


	Three Months Ended September 30,				Nine Months Ended September 30,				Three Months Ended March 31,
	2017		2016		2017		2016		2019		2018
Salaries and wages	$	84,388	$	79,411	$	247,895	$	236,814	$	92,476	$	86,683
Employee benefits	17,730		17,844		57,553		55,861		23,526		21,995
Net occupancy	19,391		18,202		57,781		53,631		19,267		19,740
Furniture and equipment	18,743		17,979		54,983		53,474
Technology, furniture and equipment									21,664		19,679
Deposit insurance	4,862		4,558		15,347		12,412		2,808		4,879
Intangible amortization	405		586		1,301		1,869		325		388
Other	41,304		41,925		127,929		125,048		41,734		43,247
Total	$	186,823	$	180,505	$	562,789	$	539,109	$	201,800	$	196,611

Total non-interest expense for the three ~~and nine~~ months ended ~~September 30, 2017~~March 31, 2019 increased ~~$6.3~~$5.2 million, or ~~3.5% and $23.7 million, or 4.4%~~2.6%, compared to the same ~~periods~~period in ~~2016.~~2018. Changes in the various components of non-interest expense are discussed below.

Salaries and Wages. Salaries and wages for the three ~~and nine~~ months ended ~~September 30, 2017~~March 31, 2019 increased ~~$5.0~~$5.8 million, or ~~6.3%, and $11.1 million, or 4.7%~~6.7%, compared to the same ~~periods~~period in ~~2016.~~2018. The increase was primarily related to an increase in salaries, due to an increase in the number of employees and normal annual merit and market increases, as well as increases in ~~stock~~incentive compensation and ~~incentive~~stock compensation. Salaries and wages during the three and nine months ended September 30, 2017 also included approximately $1.2 million in severance expense primarily related to the closure of certain branch locations.

Employee Benefits. Employee benefits expense for the three months ended ~~September 30, 2017 decreased $114 thousand,~~March 31, 2019 increased $1.5 million, or ~~0.6%~~7.0%, compared to the same period in ~~2016.~~2018. The ~~decrease~~increase was primarily due to ~~decreases~~increases in medical ~~insurance~~benefits expense ~~(down $502~~(up $654 thousand), expenses related to our defined benefit retirement plans ~~(down $302~~(up $585 thousand) and ~~other employee benefits (down $120 thousand) partly offset by an increase in~~ expenses related to our 401(k) ~~and profit sharing plans~~plan (up ~~$851~~$387 thousand). ~~Employee~~

benefits expense for the nine months ended September 30, 2017 increased $1.7 million, or 3.0%, compared to the same period in 2016. The increase was primarily due to increases in expenses related to our 401(k) and profit sharing plans (up $1.6 million) and payroll taxes (up $1.1 million) partly offset by a decrease in expenses related to our defined benefit retirement plans (down $1.1 million).

During the three ~~and nine~~ months ended ~~September 30, 2017,~~March 31, 2019, we recognized a combined net periodic pension expense of ~~$125~~$331 thousand ~~and $376 thousand, respectively,~~ related to our defined benefit retirement plans compared to a combined net periodic pension ~~expense~~benefit of ~~$427~~$254 thousand ~~and $1.4 million~~ during the same ~~periods~~period in 2016. Net periodic pension expense during the nine months ended September 30, 2016 included $187 thousand in supplemental executive retirement plan (“SERP”) settlement costs related to the retirement of a former executive officer.2018. Our defined benefit retirement and restoration plans were frozen effective as of December 31, 2001 and were replaced by a profit sharing ~~plan.~~plan (which was merged with and into our 401(k) plan during 2019). Management believes these actions helped to reduce the volatility in retirement plan expense. However, we still have funding obligations related to the defined benefit and restoration plans and could recognize retirement expense related to these plans in future years, which would be dependent on the return earned on plan assets, the level of interest rates and employee turnover. See Note 12 - Defined Benefit Plans for additional information related to our net periodic pension benefit/cost.

Net Occupancy. Net occupancy expense for the three ~~and nine~~ months ended ~~September 30, 2017 increased $1.2 million,~~March 31, 2019 decreased $473 thousand, or ~~6.5%, and $4.2 million, or 7.7%~~2.4%, compared to the same ~~periods~~period in ~~2016.~~2018. The ~~increase~~decrease during the three months ended ~~September 30, 2017~~March 31, 2019 was primarily related to decreases in property taxes (down $753 thousand), repairs and maintenance/service contracts expense (down $220 thousand) and utilities expense (down $220 thousand) partly offset by increases in lease expense (up ~~$782 thousand), property taxes (up $338 thousand), utilities expense (up $140~~$465 thousand) and depreciation on leasehold improvements (up ~~$125~~$230 thousand) ~~partly offset by a decrease in building depreciation (down $372 thousand)~~. The increase during the nine months ended September 30, 2017 was primarily related to increases in lease expense (up $2.6 million), property taxes (up $1.0 million), depreciation on leasehold improvements (up $604 thousand), repairs and maintenance/service contracts expense (up $535 thousand) and utilities expense (up $336 thousand) partly offset by a decrease in building depreciation (down $1.1 million). The increases in lease expense and the decreases in building depreciation during the reported periods were primarily related to the sale and lease back of our headquarters building in December 2016, as more fully discussed in our 2016 Form 10-K.

Technology, Furniture and Equipment. ~~Furniture~~ Technology, furniture and equipment expense for the three ~~and nine~~ months ended ~~September 30, 2017~~March 31, 2019 increased ~~$764 thousand, or 4.2%, and $1.5~~$2.0 million, or ~~2.8%~~10.1%, compared to the same ~~periods~~period in ~~2016.~~2018. The ~~increases were~~increase was primarily related to increases in software maintenance (up ~~$974 thousand and $2.3 million for the three and nine months ended September 30, 2017, respectively) and~~$1.6 million), depreciation on furniture and equipment (up ~~$198 thousand~~$288 thousand) and $1.4 million for the three and nine months ended September 30, 2017, respectively) partly offset by a decrease in equipment rental expense (down $576 thousand and $1.6 million for the three and nine months ended September 30, 2017, respectively), and, for the nine months ended September 30, 2017, a decrease in service contracts (down $413software amortization (up $207 thousand)~~, among other things.~~.

Deposit Insurance. Deposit insurance expense totaled ~~$4.9 million and $15.3~~$2.8 million for the three ~~and nine~~ months ended ~~September 30, 2017~~March 31, 2019 compared to ~~$4.6 million and $12.4~~$4.9 million for the three ~~and nine~~ months ended ~~September 30, 2016. Deposit~~March 31, 2018. The decrease in deposit insurance expense during 2019 was ~~impacted by an increase in assets and, during the nine-months ended September 30, 2017, an increase in the overall assessment rate. The increase in the assessment rate was partly~~primarily related to a ~~new~~decrease in our base assessment rate and the termination of the quarterly Deposit Insurance Fund surcharge ~~that became applicable during~~in the ~~third~~fourth quarter of ~~2016.~~ 2018, as further discussed below.

In August 2016, the Federal Deposit Insurance Corporation (“FDIC”) announced that the Deposit Insurance Fund ~~(“DIF”)~~ reserve ratio had surpassed 1.15% as of June 30, 2016. As a result, beginning in the third quarter of 2016, the range of initial assessment rates for all institutions was adjusted downward and institutions with $10 billion or more in assets were assessed a quarterly surcharge. The quarterly surcharge ~~will continue to be assessed until such time~~was terminated in the fourth quarter of 2018 as the Deposit Insurance Fund reserve ratio ~~reaches~~as of September 30, 2018 exceeded the statutory minimum of 1.35% required by the Dodd-Frank ~~Wall Street Reform and Consumer Protection~~ Act.

Intangible ~~Amortization~~.Amortization. Intangible amortization is primarily related to core deposit intangibles and, to a lesser extent, intangibles related to customer relationships and non-compete agreements. Intangible amortization for the three ~~and nine~~ months ended ~~September 30, 2017~~March 31, 2019 decreased ~~$181~~$63 thousand, or ~~30.9%~~16.2%, ~~and $568 thousand, or 30.4%, respectively,~~ compared to the same ~~periods~~period in ~~2016.~~2018. The decrease in amortization was primarily related to the completion of amortization of certain previously recognized intangible assets as well as a reduction in the annual amortization rate of certain previously recognized intangible assets as we use an accelerated amortization approach which results in higher amortization rates during the earlier years of the useful lives of intangible assets.

Other Non-Interest Expense. Other non-interest expense for the three months ended ~~September 30, 2017~~March 31, 2019 decreased ~~$621 thousand,~~$1.5 million, or ~~1.5%~~3.5%, compared to the same period in ~~2016.~~2018. The decrease included decreases in ~~check card~~donations expense (down ~~$1.2~~$3.7 million), sundry and other miscellaneous expenses (down $1.9 million) and professional services expense (down ~~$711~~$960 thousand), ~~regulatory examination fees (down $198 thousand) and losses on the sale/write-down~~among other things. Donations expense during 2018 was impacted by a significant contribution to our charitable foundation. Professional services expense during 2018 was impacted by a data security incident which resulted in unauthorized access to a third-party lockbox software program used by certain of ~~foreclosed and other assets (down $170 thousand). These~~our commercial lockbox customers to store digital images. The aforementioned items were partly offset by increases in ~~guard services~~advertising/promotions expense, partly related to new sponsorship arrangements (up ~~$580 thousand)~~$3.5 million), ~~the provision for losses on unfunded loan commitments (up$250 thousand), business development expenses~~and platform/management fees related to Frost Investment Advisors and Frost Investment Services (up ~~$207 thousand), point-of-sale related expenses (up $205 thousand), platform fees associated with our managed mutual funds (up $198 thousand) and travel/meals and entertainment expense (up $194~~$489 thousand), among other things. ~~Other non-interest expense for the nine months ended September 30, 2017 increased~~

$2.9 million, or 2.3%, compared to the same period in 2016. The increase included increases in guard services expense (up $1.1 million), fraud losses (up $924 thousand), travel/meals and entertainment expense (up $828 thousand), advertising/promotions expense (up $688 thousand) and outside computer services expense (up $760 thousand), among other things. These items were partly offset by a decrease in check card expense (down $1.8 million), among other things. Guard services expense during the three and nine months ended September 30, 2017 was impacted by the effects of hurricane Harvey during the third quarter. The increase in fraud losses was primarily related to check cards, ATMs and checks.

Results of Segment Operations

Our operations are managed along two primary operating segments: Banking and Frost Wealth Advisors. A description of each business and the methodologies used to measure financial performance is described in Note 1615 - Operating Segments in the accompanying notes to consolidated financial statements included elsewhere in this report. Net income (loss) by operating segment is presented below:


	Three Months Ended September 30,						Nine Months Ended September 30,						Three Months Ended March 31,
	2017			2016			2017			2016			2019			2018
Banking	$	88,368		$	76,347		$	250,766		$	210,454		$	112,917		$	103,641
Frost Wealth Advisors	6,417			4,797			17,990			13,809			6,400			5,634
Non-Banks	(1,654		)	(925		)	(5,131		)	(3,721		)	(2,821		)	(2,795		)
Consolidated net income	$	93,131		$	80,219		$	263,625		$	220,542		$	116,496		$	106,480

Banking

Net income for the three ~~and nine~~ months ended ~~September 30, 2017~~March 31, 2019 increased ~~$12.0~~$9.3 million, or ~~15.7%, and $40.3 million, or 19.2%~~9.0%, compared to the same ~~periods~~period in ~~2016.~~2018. The increase during the three months ended ~~September 30, 2017~~March 31, 2019 compared to the same period in 2018 was primarily the result of ~~a $24.0 million increase~~increases in net interest income (up $17.1 million) and ~~a $1.8 million decrease in~~non-interest income ~~tax expense~~(up $3.0 million) partly offset by ~~a $6.1 million increase~~increases in non-interest expense ~~a $5.9 million increase in~~(up $4.2 million), the provision for loan losses (up $4.1 million) and a $1.8 million decrease in non-interest income. The increase during the nine months ended September 30, 2017 was primarily the result of a $65.0 million increase in net interest income and a $15.4 million decrease in the provision for loan losses partly offset by a $20.2 million increase in non-interest expense, a $15.4 million decrease in non-interest income and a $4.5 million increase in income tax ~~expense.~~expense (up $2.6 million).

Net interest income for the three ~~and nine~~ months ended ~~September 30, 2017~~March 31, 2019 increased ~~$24.0~~$17.1 million, or ~~12.5%, and $65.0 million, or 11.4%~~7.4%, compared to the same ~~periods in 2016. Taxable-equivalent net interest income for the first nine months of 2017 included 273 days compared to 274 days for the same~~ period in ~~2016 as a result of the leap year.~~2018. The additional day added approximately $1.5 million to taxable-equivalent net interest income during the first nine months of 2016. Despite the effect of this additional day during 2016, net interest incomeincrease during the three ~~and nine~~ months ended ~~September 30, 2017 increased due~~March 31, 2019 was primarily related to ~~the impact of increases in the average volume of tax-exempt securities, loans and interest-bearing deposits as well as~~ increases in the average yields on loans, ~~and~~ interest-bearing deposits ~~partly offset by the impact of decreases in the average yields on tax-exempt~~ and taxable securities combined with ~~the impact of~~ increases in the average ~~rate~~volumes of loans, tax-exempt securities and taxable securities. The impact of these items was partly offset by increases in the average rates paid on interest-bearing ~~liabilities.~~deposits and other borrowed funds and a decreases in the average volume of interest bearing deposits (primarily excess reserves held in an interest-bearing account at the Federal Reserve). See the analysis of net interest income included in the section captioned “Net Interest Income” included elsewhere in this discussion.

The provision for loan losses for the three ~~and nine~~ months ended ~~September 30, 2017~~March 31, 2019 totaled $11.0 million ~~and $27.4 million~~ compared to ~~$5.0 million and $42.7~~$6.9 million for the same ~~periods~~period in ~~2016.~~2018. See the analysis of the provision for loan losses included in the section captioned “Allowance for Loan Losses” included elsewhere in this discussion.

Non-interest income for the three months ended ~~September 30, 2017 decreased $1.8~~March 31, 2019 increased $3.0 million, or ~~3.5%, while non-interest income for the nine months ended September 30, 2017 decreased $15.4 million, or 9.2%~~5.2%, compared to the same ~~periods~~period in ~~2016. Both the three and nine months ended September 30, 2017 included a net loss on securities transactions of $4.9 million compared to a net loss of $37 thousand~~2018. The increase during the three months ended September 30, 2016 and a net gain of $14.9 million during the nine months ended September 30, 2016. See the analysis of these net gains and losses included in the section captioned “Net Gain/Loss on Securities Transactions” included elsewhere in this discussion. Excluding the impact of the net gains or losses on securities transactions, total non-interest income during the three and nine months ended September 30, 2017 effectively increased $3.0 million, or 5.9%, and $4.4 million, or 2.9%, respectively compared to the same periods in 2016March 31, 2019 was primarily due to increases ~~in other non-interest income, service charges on deposit accounts and interchange and debit card transactions fees partly offset by decreases~~ in insurance commissions and fees and other ~~charges, commissions and fees.~~non-interest income. The increases in other non-interest income for the three and nine months ended September 30, 2017 were primarily related to increases in gains on the sale of foreclosed and other assets, sundry and other miscellaneous income, income from customer foreign currency transactions and income from customer derivative and trading activities, among other things, partly offset by decreases in lease rental income and earnings on the cash surrender value of life insurance policies, among other things. Sundry income during the three and nine months ended September 30, 2017 included $1.2 million related to the collection of amounts charged-off by Western National Bank prior to our acquisition,

~~among other things. Gains on the sale of foreclosed and other assets during 2017 included the amortization of the deferred gain on our headquarters building, which we sold in December 2016. The~~ increase in service charges on deposit accounts during the three and nine months ended September 30, 2017 were primarily due to increases in overdraft/insufficient funds charges on consumer and commercial accounts and consumer service charges partly offset by decreases in commercial service charges. The increase in interchange and debit card transactions fees during the three and nine months ended September 30, 2017 were primarily due to increases in income from debit card transactions and ATM service fees. The increases were primarily related to increased transaction volumes. The decrease in insurance commissions and fees during the three and nine months ended September 30, 2017 were related to decreases in contingent income, primarily related to a lack of growth within the portfolio and a deterioration in the loss performance of insurance policies previously placed, partly offset by increases in commission income,was primarily related to increases in benefit plan commissions, commissions on property and casualty policies, and life insurance commissions due to increased business ~~volumes. The~~volumes and market rates partly offset by a decrease in performance related contingent payments. The increase in other ~~charges, commissions~~non-interest income was primarily related to increases in sundry and other miscellaneous income and public finance underwriting fees partly offset by a decrease in income from customer derivative and trading activities. Sundry income during the three ~~and nine~~ months ended ~~September 30, 2017 was primarily due~~March 31, 2019 included the recovery of interest written-off prior to ~~decreases in human resources consulting fee income~~2019 and income from corporate finance and capital market advisory services, among other things, partly offset by increases in wire transfer fees, and for the nine months ended September 30, 2017, an increase in loan processing fees,a settlement, among other things. The fluctuations in public finance underwriting fees income from customer derivative and trading activities during the three months

ended March 31, 2019 were primarily related to changes in business volumes. See the analysis of these categories of non-interest income included in the section captioned “Non-Interest Income” included elsewhere in this discussion.

Non-interest expense for the three ~~and nine~~ months ended ~~September 30, 2017~~March 31, 2019 increased ~~$6.1~~$4.2 million, or ~~4.0%, and $20.2 million, or 4.4%~~2.5%, compared to the same ~~periods~~period in ~~2016.~~2018. The increase during the three months ended ~~September 30, 2017~~March 31, 2019 was primarily related to increases in salaries and ~~wages, other non-interest expense and~~wages; technology, furniture and equipment expense; and employee benefits partly offset by decreases in deposit insurance and other non-interest expense. The increase ~~during the nine months ended September 30, 2017 was primarily related to increases~~ in salaries and wages ~~other non-interest expense, deposit insurance expense, employee benefits and furniture and equipment expense. The increases in salaries were~~was primarily due to ~~increases~~an increase in the number of employees and normal annual merit and market increases, as well as increases in ~~stock compensation~~incentive and ~~incentive~~stock compensation. The ~~increases~~increase in other non-interest expense were primarily related to increases in guard services expense, sundry and other miscellaneous expense and travel/meals and entertainment, among other things. Guard services expense during the three and nine months ended September 30, 2017 was impacted by the effects of hurricane Harvey during the third quarter. The increases intechnology, furniture and equipment expense ~~were~~was primarily related to increases in software maintenance, ~~and~~ depreciation on furniture and equipment partly offset by a decrease in equipment rental expense, among other things. The increase in deposit insurance expense during the nine months ended September 30, 2017 was related to an increase in the assessment rate due to a new quarterly surcharge which began in the third quarter of 2016 and ~~an increase in assets.~~software amortization. The increase in employee benefits ~~during the nine months ended September 30, 2017~~ was primarily ~~due~~related to increases in ~~payroll taxes and expenses related to our 401(k) and profit sharing plans partly offset by a decrease in~~medical benefits expense, expenses related to our defined benefit retirement ~~plans.~~plans and expenses related to our 401(k) plan. The decrease in deposit insurance expense was mostly related to a decrease in our base assessment rate and the termination of the quarterly Deposit Insurance Fund surcharge in the fourth quarter of 2018. The decrease in other non-interest expense included decreases in donations expense, sundry and other miscellaneous expenses and professional services expense, among other things. Donations expense during 2018 was impacted by a significant contribution to our charitable foundation. Professional services expense during 2018 was impacted by a data security incident which resulted in unauthorized access to a third-party lockbox software program used by certain of our commercial lockbox customers to store digital images. The aforementioned items were partly offset by increases in advertising/promotions expense, partly related to new sponsorship arrangements, among other things. See the analysis of these categories of non-interest expense included in the section captioned “Non-Interest Expense” included elsewhere in this discussion.

Frost Insurance Agency, which is included in the Banking operating segment, had gross commission revenues of ~~$10.9 million and $34.6~~$18.5 million during the three ~~and nine~~ months ended ~~September 30, 2017~~March 31, 2019 and ~~$11.0 million and $35.9~~$16.1 million during the three ~~and nine~~ months ended ~~September 30, 2016.~~March 31, 2018. The ~~decreases were~~increase was primarily related to ~~decreases in contingent commissions, partly offset by~~ increases in benefit plan ~~commissions.~~commissions; commissions on property and casualty policies; and life insurance commissions due to increased business volumes and market rates partly offset by a decrease in contingent income, primarily related to lower growth within the portfolio partly offset by improvement in the loss performance of insurance policies previously placed. See the analysis of insurance commissions and fees included in the section captioned “Non-Interest Income” included elsewhere in this discussion.

Frost Wealth Advisors

Net income for the three ~~and nine~~ months ended ~~September 30, 2017~~March 31, 2019 increased ~~$1.6 million,~~$766 thousand, or ~~33.8% and $4.2 million, or 30.3%~~13.6%, compared to the same ~~periods~~period in ~~2016.~~2018. The increase during the three months ended ~~September 30, 2017~~March 31, 2019 compared to the same period in 2018 was primarily ~~due~~related to ~~a $1.7 million increase in net interest income and a $1.3 million increase~~an increases in non-interest income (up $2.2 million) partly offset by an $873 thousand increase in income tax expense and a $500 thousand increase in non-interest expense. The increase during the nine months ended September 30, 2017 was primarily due to a $5.4 million increase in non-interest income and a $5.0 million increase in net interest income partly offset by a $3.9 million increase in non-interest expense ~~and a $2.3 million increase in income tax expense.~~

Net interest income for the three and nine months ended September 30, 2017 increased $1.7 million, or 57.0%, and $5.0 million, or 64.5%, compared to the same periods in 2016. The increases were primarily due to an increase in the funds transfer price received for funds provided related to Frost Wealth Advisors' repurchase agreements and increases in the average volume of funds provided.(up $1.3 million).

Non-interest income for the three ~~and nine~~ months ended ~~September 30, 2017~~March 31, 2019 increased ~~$1.3~~$2.2 million, or ~~4.3%, and $5.4 million, or 6.0%~~6.6%, compared to the same ~~periods~~period in ~~2016.~~2018. The ~~increases in non-interest income during the three and nine months ended September 30, 2017 were~~increase primarily related to ~~increases~~an increase in trust and investment management ~~fees and other charges, commissions and~~ fees. Trust and investment management fee income is the most significant income component for Frost Wealth Advisors. Investment fees are the most significant component of trust and investment management fees, making up approximately ~~83.5%~~83.2% of total trust and investment management fees for the first ~~nine~~three months of ~~2017.~~2019. Investment and other custodial account fees are

generally based on the market value of assets within a trust account. Volatility in the equity and bond markets impacts the market value of trust assets and the related investment fees. The increases in trust and investment management fees during the three ~~and nine~~ months ended ~~September 30, 2017~~March 31, 2019 compared to the same periods in ~~2016 were~~2018 was primarily the result of increases in trust investment fees and increases in oil and gas fees. The increase in trust investment fees during ~~2017~~2019 was due to higher average equity valuations and an increase in the number of accounts. The increase in ~~other charges, commissions~~oil and gas fees during ~~the three and nine months ended September 30, 2017~~2019 was ~~primarily due to increases in income~~ related to ~~the sale of mutual funds.~~energy prices and new business, partly driven by enhancements to our service offering. See the analysis of trust and investment management ~~fees and other charges, commissions and~~ fees included in the section captioned “Non-Interest Income” included elsewhere in this discussion.

Non-interest expense for the three ~~and nine~~ months ended ~~September 30, 2017~~March 31, 2019 increased ~~$500 thousand, or 1.9%, and $3.9~~$1.3 million, or ~~5.1%~~4.7%, compared to the same ~~periods~~period in ~~2016.~~2018. The ~~increases during the three and nine months ended September 30, 2017 were~~increase was primarily related to increases in ~~net occupancy~~other non-interest expense and salaries and ~~wages and employee benefits partly offset by decreases in other non-interest expense.~~wages. The ~~increase in net occupancy expense and decrease~~increases in other non-interest expense ~~were~~was mostly related to an increase in platform/management fees related to Frost Investment Advisors and Frost Investment Services, among other things, partly offset by a ~~change~~decrease in ~~the way we allocate occupancy~~professional service expenses, among our operating segments. Beginning in 2017, operating segments receive a direct charge for occupancy expense based upon cost centers within the segment. Such amounts are now reported as occupancy expense. Previously, these costs were included within the allocated overhead and reported as a component of other ~~non-interest expense.~~things. The ~~increases~~increase in salaries and wages ~~during the three and nine months ended September 30, 2017~~ were primarily ~~related~~due to an ~~increases~~increase in the number of employees and normal annual merit and market ~~increases. The~~increases, as well as increases in ~~employee benefits expense during the three~~incentive and ~~nine months ended September 30, 2017 were primarily related to increases in payroll taxes, expenses related to our defined benefit retirement plans and medical insurance expense.~~stock compensation.

Non-Banks

The Non-Banks operating segment had a net loss of ~~$1.7~~$2.8 million ~~and $5.1 million for the~~during three ~~and nine~~ months ended ~~September 30, 2017, respectively, compared to a net loss of $925 thousand and $3.7 million for~~March 31, 2019 as well as during the same ~~periods~~period in ~~2016. The increases in net loss during the three and nine months ended September 30, 2017 were primarily due to increases~~2018. An increase in net interest expense ~~due to an~~three months ended March 31, 2019 was mostly offset by a decrease in non-interest expense and increase in non-interest income compared to the ~~interest rates paid on our long-term borrowings.~~same period in 2018.

Income Taxes

We recognized income tax expense of ~~$9.9 million and $35.1~~$14.0 million, for an effective tax rate of ~~9.6% and 11.8%~~10.7% for the three ~~and nine~~ months ended ~~September 30, 2017~~March 31, 2019 compared to ~~$10.9 million and $28.6~~$11.2 million, for an effective tax rate of ~~11.9% and 11.5%~~9.5% for the three ~~and nine~~ months ended ~~September 30, 2016.~~March 31, 2018. The effective income tax rates differed from the U.S. statutory federal income tax ~~rate~~rates of ~~35%~~21% during ~~the comparable periods~~2019 and 2018 primarily due to the effect of tax-exempt income from loans, securities and life insurance policies and the income tax effects associated with stock-based compensation. The decrease in income tax expense and the effective tax rate during the three months ended September 30, 2017 compared to the same period in 2016 was primarily related to the correction of an over-accrual of taxes that resulted from incorrectly classifying certain tax-exempt loans as taxable for federal income tax purposes since 2013. As a result, we recognized tax benefits totaling $3.7 million, which included $2.9 million related to the 2013 through 2016 tax years and $756 thousand related to the first and second quarters of 2017. The increase in income tax expense and the effective tax rate during the nine months ended September 30, 2017 was primarily related to an increase in total income with a higher proportion of taxable income relative to tax-exempt income, partly offset by the effect of the aforementioned tax benefits related to tax-exempt loans. Excluding the effect of the corrections related to tax-exempt loan interest, our effective tax rates would have been 13.2% and 12.7% for the three and nine months ended September 30, 2017, respectively.

Excluding the deferred tax effects related to other comprehensive income, net deferred tax assets totaled $59.9 million at September 30, 2017. This amount is based upon the current statutory federal income tax rate of 35%. There have been recent legislative proposals to reduce the statutory federal income tax rate. While there can be no assurance that a reduction will ultimately occur, any such reduction in the statutory federal income tax rate would impact the carrying value of our net deferred tax assets with a corresponding charge to income tax expense.

Average Balance Sheet

Average assets totaled ~~$30.2~~$31.4 billion for the ~~nine~~three months ended ~~September 30, 2017~~March 31, 2019 representing an increase of ~~$1.7 billion,~~$225.0 million, or ~~6.1%~~0.7%, compared to average assets for the same period in ~~2016. The growth in average~~2018. Earning assets was primarily funded by deposit growth, an increase in average federal funds purchased and repurchase agreements and earnings retention. The increase was primarily reflected in earning assets, which increased $1.7 billion,decreased $48.0 million, or ~~6.6%~~0.2%, during the first ~~nine~~three months of ~~2017~~2019 compared to the same period in ~~2016.~~2018. The ~~increase~~decrease in earning assets ~~included an $821.8~~was primarily related to a $1.9 billion decrease in average interest-bearing deposits, federal funds sold and resell agreements mostly offset by a $910.6 million increase in average loans, a ~~$648.9~~$558.2 million increase in average tax-exempt securities and a ~~$384.9~~$373.4 million increase in average ~~interest-bearing~~taxable securities. Average premises and equipment increased $211.5 million, or 40.40%, primarily resulting from the adoption of a new accounting standard which required the recognition of our operating leases on our balance sheet (See Note 1 - Significant Accounting Policies in the accompanying Notes to Financial Statements). Average deposits decreased $317.3 million, or 1.20%, during the first three months of 2019 compared to the same period in 2018. The decrease included a $779.8 million decrease in non-interest bearing deposits partly offset by a ~~$133.6 million decrease in average taxable securities. Average deposit growth included an $832.2 million increase in non-interest bearing deposits and a $699.7~~$462.5 million increase in interest-bearing deposit accounts. Average non-interest bearing deposits made up ~~41.7%~~39.0% and ~~40.9%~~41.5% of average total deposits during the first ~~nine~~three months of ~~2017~~2019 and ~~2016,~~2018, respectively.

Loans

Loans were as follows as of the dates indicated:


	September 30, 2017		Percentage of Total		December 31, 2016		Percentage of Total		March 31, 2019		Percentage of Total		December 31, 2018		Percentage of Total
Commercial and industrial	$	4,677,923	36.8	%	$	4,344,000	36.3	%	$	5,368,271	37.3	%	$	5,111,957	36.3	%
Energy:
Production	1,094,927		8.6		971,767		8.1		1,278,366		8.9		1,309,314		9.3
Service	159,893		1.3		221,213		1.8		166,649		1.2		168,775		1.2
Other	132,240		1.0		193,081		1.7		114,058		0.7		124,509		0.9
Total energy	1,387,060		10.9		1,386,061		11.6		1,559,073		10.8		1,602,598		11.4
Commercial real estate:
Commercial mortgages	3,714,172		29.2		3,481,157		29.1		4,256,999		29.6		4,121,966		29.2
Construction	1,082,229		8.5		1,043,261		8.7		1,244,567		8.6		1,267,717		9.0
Land	307,701		2.4		311,030		2.6		311,629		2.2		306,755		2.2
Total commercial real estate	5,104,102		40.1		4,835,448		40.4		5,813,195		40.4		5,696,438		40.4
Consumer real estate:
Home equity loans	357,542		2.8		345,130		2.9		351,762		2.4		353,924		2.5
Home equity lines of credit	288,981		2.3		264,862		2.2		337,312		2.3		337,168		2.4
Other	367,948		2.9		326,793		2.7		438,678		3.1		427,898		3.0
Total consumer real estate	1,014,471		8.0		936,785		7.8		1,127,752		7.8		1,118,990		7.9
Total real estate	6,118,573		48.1		5,772,233		48.2		6,940,947		48.2		6,815,428		48.3
Consumer and other	522,748		4.2		473,098		3.9		538,048		3.7		569,750		4.0
Total loans	$	12,706,304	100.0	%	$	11,975,392	100.0	%	$	14,406,339	100.0	%	$	14,099,733	100.0	%

Loans increased ~~$730.9~~$306.6 million, or ~~6.1%~~2.2%, compared to December 31, ~~2016.~~2018. The majority of our loan portfolio is comprised of commercial and industrial loans, energy loans and real estate loans. Commercial and industrial loans made up ~~36.8%~~37.3% and 36.3% of total loans at ~~September 30, 2017~~March 31, 2019 and December 31, ~~2016,~~2018, respectively, while energy loans made up ~~10.9%~~10.8% and ~~11.6%~~11.4% of total loans, respectively, and real estate loans made up ~~48.1%~~48.2% and ~~48.2%~~48.3% of total loans, respectively, at those dates. Real estate loans include both commercial and consumer balances. Selected details related to our loan portfolio segments are presented below. Refer to our ~~2016~~2018 Form 10-K for a more detailed discussion of our loan origination and risk management processes.

Commercial and industrial. Commercial and industrial loans increased ~~$333.9~~$256.3 million, or ~~7.7%~~5.0%, during the first ~~nine~~three months of ~~2017.~~2019. Our commercial and industrial loans are a diverse group of loans to small, medium and large businesses. The purpose of these loans varies from supporting seasonal working capital needs to term financing of equipment. While some short-term loans may be made on an unsecured basis, most are secured by the assets being financed with collateral margins that are consistent with

our loan policy guidelines. The commercial and industrial loan portfolio also includes commercial leases and purchased shared national credits ("SNC"s).

Energy. Energy loans include loans to entities and individuals that are engaged in various energy-related activities including (i) the development and production of oil or natural gas, (ii) providing oil and gas field servicing, (iii) providing energy-related transportation services (iv) providing equipment to support oil and gas drilling (v) refining petrochemicals, or (vi) trading oil, gas and related commodities. Energy loans ~~increased $999 thousand,~~decreased $43.5 million, or ~~0.1%~~2.7%, during the first ~~nine~~three months of ~~2017~~2019 compared to December 31, ~~2016. The increase was related to an increase in production loans mostly offset by decreases in service and other loans.~~2018. The average loan size, the significance of the portfolio and the specialized nature of the energy industry requires a highly

prescriptive underwriting policy. Exceptions to this policy are rarely granted. Due to the large borrowing requirements of this customer base, the energy loan portfolio includes participations and SNCs.

Purchased Shared National Credits. Purchased shared national credits are participations purchased from upstream financial organizations and tend to be larger in size than our originated portfolio. Our purchased SNC portfolio totaled ~~$795.4~~$847.6 million at ~~September 30, 2017,~~March 31, 2019, increasing ~~$23.3~~$90.1 million, or ~~3.0%~~11.9%, from ~~$772.2~~$757.5 million at December 31, ~~2016.~~2018. At ~~September 30, 2017, 53.4%~~March 31, 2019, 52.0% of outstanding purchased SNCs were related to the energy industry and ~~16.4% of outstanding purchased SNCs were~~16.2% related to the construction industry. The remaining purchased SNCs were diversified throughout various other industries, with no other single industry exceeding 10% of the total purchased SNC portfolio. Additionally, almost all of the outstanding balance of purchased SNCs was included in the energy and commercial and industrial portfolio, with the remainder included in the real estate categories. SNC participations are originated in the normal course of business to meet the needs of our customers. As a matter of policy, we generally only participate in SNCs for companies headquartered in or which have significant operations within our market areas. In addition, we must have direct access to the company’s management, an existing banking relationship or the expectation of broadening the relationship with other banking products and services within the following 12 to 24 months. SNCs are reviewed at least quarterly for credit quality and business development successes.

Commercial Real Estate. Commercial real estate loans totaled ~~$5.1~~$5.8 billion at ~~September 30, 2017,~~March 31, 2019, increasing ~~$268.7~~$116.8 million compared to ~~$4.8~~$5.7 billion at December 31, ~~2016.~~2018. At such dates, commercial real estate loans represented ~~83.4%~~83.8% and ~~83.8%~~83.6% of total real estate loans, respectively. The majority of this portfolio consists of commercial real estate mortgages, which includes both permanent and intermediate term loans. These loans are viewed primarily as cash flow loans and secondarily as loans secured by real estate. Consequently, these loans must undergo the analysis and underwriting process of a commercial and industrial loan, as well as that of a real estate loan. At ~~September 30, 2017,~~March 31, 2019, approximately ~~51%~~50% of the outstanding principal balance of our commercial real estate loans were secured by owner-occupied properties.

Consumer Real Estate and Other Consumer Loans. The consumer loan portfolio, including all consumer real estate and consumer installment loans, totaled ~~$1.5~~$1.7 billion at ~~September 30, 2017~~both March 31, 2019 and ~~$1.4 billion at~~ December 31, ~~2016.~~2018. Consumer real estate loans, increased ~~$77.7~~$8.8 million, or ~~8.3%~~0.8%, from December 31, ~~2016.~~2018. Combined, home equity loans and lines of credit made up ~~63.7%~~61.1% and ~~65.1%~~61.8% of the consumer real estate loan total at ~~September 30, 2017~~March 31, 2019 and December 31, ~~2016,~~2018, respectively. We offer home equity loans up to 80% of the estimated value of the personal residence of the borrower, less the value of existing mortgages and home improvement loans. In general, we do not originate 1-4 family mortgage loans; however, from time to time, we may invest in such loans to meet the needs of our customers or for other regulatory compliance purposes. Consumer and other loans ~~increased $49.7~~decreased $31.7 million, or ~~10.5%~~5.6%, from December 31, ~~2016.~~2018. The consumer and other loan portfolio primarily consists of automobile loans, overdrafts, unsecured revolving credit products, personal loans secured by cash and cash equivalents and other similar types of credit facilities.

Non-Performing Assets

Non-performing assets and accruing past due loans are presented in the table below. Troubled debt restructurings on non-accrual status are reported as non-accrual loans. Troubled debt restructurings on accrual status are reported separately.


	September 30, 2017			December 31, 2016			March 31, 2019			December 31, 2018
Non-accrual loans:
Commercial and industrial	$	37,239		$	31,475		$	16,035		$	9,239
Energy	96,717			57,571			45,673			46,932
Commercial real estate:
Buildings, land and other	6,773			8,550			26,760			15,268
Construction	—			—			410			—
Consumer real estate	2,167			2,130			1,860			892
Consumer and other	208			425			1,424			1,408
Total non-accrual loans	143,104			100,151			92,162			73,739
Restructured loans	4,815			—			4,028			—
Foreclosed assets:
Real estate	2,094			2,440			1,175			1,175
Other	—			—			—			—
Total foreclosed assets	2,094			2,440			1,175			1,175
Total non-performing assets	$	150,013		$	102,591		$	97,365		$	74,914

Ratio of non-performing assets to:
Total loans and foreclosed assets	1.18		%	0.86		%	0.68		%	0.53		%
Total assets	0.48			0.34			0.31			0.23
Accruing past due loans:
30 to 89 days past due	$	52,044		$	55,456		$	58,941		$	59,595
90 or more days past due	27,121			24,864			13,789			20,468
Total accruing past due loans	$	79,165		$	80,320		$	72,730		$	80,063
Ratio of accruing past due loans to total loans:
30 to 89 days past due	0.41		%	0.46		%	0.41		%	0.42		%
90 or more days past due	0.21			0.21			0.10			0.15
Total accruing past due loans	0.62		%	0.67		%	0.51		%	0.57		%

Non-performing assets include non-accrual loans, troubled debt restructurings and foreclosed assets. Non-performing assets at ~~September 30, 2017~~March 31, 2019 increased ~~$47.4~~$22.5 million from December 31, ~~2016 primarily due to an increase~~2018 reflecting increases in non-accrual ~~energy~~commercial real estate loans, ~~and, to a lesser extent, non-accrual~~ commercial and industrial loans and restructured loans. There were no non-accrual commercial industrial loans in excess of $5.0 million at March 31, 2019 or December 31, 2018. Non-accrual energy loans included ~~four~~two credit relationships in excess of $5 million totaling ~~$86.4~~$43.6 million at ~~September 30, 2017. Of this amount, $29.0 million related to two credit relationships that were~~March 31, 2019, each of which was previously reported as non-accrual ~~at December 31, 2016 and $57.5 million related to two credit relationships that were placed on non-accrual status during the third quarter~~with an aggregate balance of 2017, one of which was a $43.1 million credit relationship that was previously reported as a potential problem loan at June 30, 2017. Non-accrual energy loans included four credit relationships in excess of $5 million totaling $52.1$44.0 million at December 31, 2016. Of this amount, we charged-off a total of $10.0 million related to two credit relationships during the first and second quarters of 2017. The outstanding balance of these two credit relationships was $20.5 million at December 31, 2016. Subsequent to the charge-off, the remaining balance of one of these credit relationships was paid-off. The outstanding balance of the other credit relationship totaled $4.9 million at September 30, 2017 and is included in non-accrual energy loans in the table above. Non-accrual commercial and industrial loans included one credit relationship in excess of $5 million totaling $22.0 million at September 30, 2017. This credit relationship was placed on non-accrual status during the third quarter of 2017 and was previously classified as “substandard - accrual” (risk grade 11) at June 30, 2017, though not reported as a potential problem at that time. Non-accrual commercial and industrial loans included one credit relationship in excess of $5 million totaling $9.8 million at December 31, 2016. Of this amount, we charged-off $4.7 million during the third quarter of 2017. The outstanding balance of this credit relationship totaled $4.9 million at September 30, 2017 and is included in non-accrual commercial and industrial loans in the table above.2018. Non-accrual real estate loans primarily consist of land development, 1-4 family residential construction credit relationships and loans secured by office buildings and religious facilities. Non-accrual commercial real estate loans included two relationships in excess of $5.0 million totaling $20.2 million at March 31, 2019. Non-accrual commercial real estate loans included one relationship in excess of $5.0 million totaling $12.2 million at December 31, 2018.

Generally, loans are placed on non-accrual status if principal or interest payments become 90 days past due and/or management deems the collectibility of the principal and/or interest to be in question, as well as when required by regulatory requirements. Once interest accruals are discontinued, accrued but uncollected interest is charged to current year operations. Subsequent receipts

on non-accrual loans are recorded as a reduction of principal, and interest income is recorded only after principal recovery is reasonably assured. Classification of a loan as non-accrual does not preclude the ultimate collection of loan principal or interest.

Restructured loans totaled $4.0 million at March 31, 2019 and consisted of four notes related to a single credit relationship primarily related to commercial real estate. There were no restructured loans at December 31, 2018.

Foreclosed assets represent property acquired as the result of borrower defaults on loans. Foreclosed assets are recorded at estimated fair value, less estimated selling costs, at the time of foreclosure. Write-downs occurring at foreclosure are charged against the allowance for loan losses. Regulatory guidelines require us to reevaluate the fair value of foreclosed assets on at least an annual basis. Our policy is to comply with the regulatory guidelines. Write-downs are provided for subsequent declines in value

and are included in other non-interest expense along with other expenses related to maintaining the properties. ~~Write-downs~~There were no write-downs of foreclosed assets ~~were not significant~~ during the ~~nine~~three months ended ~~September 30, 2017 or 2016.~~March 31, 2019 while write-downs of foreclosed assets totaled $473 thousand during the three months ended March 31, 2018.

Potential problem loans consist of loans that are performing in accordance with contractual terms but for which management has concerns about the ability of an obligor to continue to comply with repayment terms because of the obligor’s potential operating or financial difficulties. Management monitors these loans closely and reviews their performance on a regular basis. At ~~September 30, 2017~~March 31, 2019 and December 31, ~~2016,~~2018, we had ~~$89.7~~$46.6 million and ~~$62.7~~$63.4 million in loans of this type which are not included in any one of the non-accrual, restructured or 90 days past due loan categories. At ~~September 30, 2017,~~March 31, 2019, potential problem loans consisted of ~~seven~~eight credit relationships. Of the total outstanding balance at ~~September 30, 2017, 32.5%~~March 31, 2019, 39.9% was related to the restaurant industry, 23.6% was related to the energy industry ~~24.8%~~and 10.9% was related to the ~~manufacturing industry and 13.9% was related to the chemicals~~automobile industry. Weakness in these organizations’ operating performance and financial condition, ~~loan agreement breaches and borrowing base deficits for certain energy credits,~~ among other factors, have caused us to heighten the attention given to these credits.

Allowance for Loan Losses

The allowance for loan losses is a reserve established through a provision for loan losses charged to expense, which represents management’s best estimate of inherent losses that have been incurred within the existing portfolio of loans. The allowance, in the judgment of management, is necessary to reserve for estimated loan losses and risks inherent in the loan portfolio. Our allowance for loan loss methodology, which is more fully described in our ~~2016~~2018 Form 10-K, follows the accounting guidance set forth in U.S. generally accepted accounting principles and the Interagency Policy Statement on the Allowance for Loan and Lease Losses, which was jointly issued by U.S. bank regulatory agencies. The level of the allowance reflects management’s continuing evaluation of industry concentrations, specific credit risks, loan loss and recovery experience, current loan portfolio quality, present economic, political and regulatory conditions and unidentified losses inherent in the current loan portfolio. Portions of the allowance may be allocated for specific credits; however, the entire allowance is available for any credit that, in management’s judgment, should be charged off.

The table below provides, as of the dates indicated, an allocation of the allowance for loan losses by loan type; however, allocation of a portion of the allowance to one category of loans does not preclude its availability to absorb losses in other categories:


	September 30, 2017		December 31, 2016		March 31, 2019		December 31, 2018
Commercial and industrial	$	48,437	$	52,915	$	58,571	$	48,580
Energy	51,913		60,653		25,343		29,052
Commercial real estate	38,075		30,213		36,455		38,777
Consumer real estate	6,875		4,238		5,661		6,103
Consumer and other	9,003		5,026		10,320		9,620
Total	$	154,303	$	153,045	$	136,350	$	132,132

The reserve allocated to commercial and industrial loans at ~~September 30, 2017 decreased $4.5~~March 31, 2019 increased $10.0 million compared to December 31, ~~2016.~~2018. The ~~decrease~~increase was primarily due to ~~decreases~~increases in historical valuation allowances, specific valuation allowances and ~~specific~~general valuation allowances partly offset by ~~increases~~a decrease in macroeconomic ~~valuation allowances and general~~ valuation allowances. Historical valuation allowances ~~decreased~~increased $6.1 million from ~~$33.3~~$25.4 million at December 31, ~~2016~~2018 to ~~$27.2~~$31.4 million at ~~September 30, 2017.~~March 31, 2019. The ~~decrease~~increase was primarily related to ~~decreases~~an increase in the volume of classified loans graded as "substandard - accrual" (risk grade 11) as well as non-classified loans graded "watch" (risk grade 9) combined with increases in the historical loss allocation factors for non-classified loans graded as “watch” (risk grade 9) and “special mention” (risk grade 10) and classified commercial and industrial loans partly offset by increases in the volume of certain categories of both non-classified and classified loans.applied to these loan grades. Classified loans consist of loans having a risk grade of 11, 12 or 13. Classified commercial and industrial loans totaled ~~$150.5~~$110.0 million at ~~September 30, 2017~~March 31, 2019 compared to ~~$131.9~~$78.9 million at December 31, ~~2016.~~2018. The weighted-average risk grade of commercial and industrial loans was ~~6.38~~6.33 at ~~September 30, 2017~~March 31, 2019 compared to ~~6.35~~6.30 at December 31, ~~2016.~~2018. Commercial loan net charge-offs totaled ~~$12.2~~$1.9 million during the first ~~nine~~three months of ~~2017~~2019 compared to ~~$8.2~~$7.7 million during the first ~~nine~~three months of ~~2016. Specific valuation allowances decreased $3.8 million from $5.4 million at December 31, 2016 to $1.7 million at September 30, 2017.~~2018. Charge-offs in ~~2017~~2018 included ~~$3.6~~$8.2 million related to two credit relationships that, as of December 31, 2016, had associated specific valuation allowances totaling $3.5 million. Charge-offs in 2017 also included $7.4 million related to two credit relationships for which we had no specific allocation as of December 31, 2016, or at the time of charge-off. Macroeconomicrelationships. Specific valuation allowances for commercial and industrial loans increased ~~$4.7~~$4.1 million from ~~$7.5~~$2.6 million at December 31,

~~2016~~ 2018 to ~~$12.2~~$6.7 million at ~~September 30, 2017.~~March 31, 2019. The increase was ~~primarily~~mostly related to new specific valuation allowances totaling $4.4 million on four credit relationships which had an ~~increase in the general macroeconomic allocation (up $5.5 million) partly offset by a decrease in the environmental risk adjustment (down $980 thousand). The general macroeconomic risk allocation~~aggregate outstanding balance totaling $7.9 million at ~~September 30, 2017 was partly impacted by the effect of hurricane Harvey on our Houston and Corpus Christi market areas.~~March 31, 2019. General valuation allowances for commercial and industrial loans increased ~~$689~~$808 thousand from ~~$6.7~~$10.1 million at December 31, ~~2016~~2018 to ~~$7.4~~$10.9 million at ~~September 30, 2017.~~March 31, 2019. The increase was primarily related to ~~increases in the allocations for highly leveraged credit relationships, large credit relationships and loans not reviewed by concurrence combined with~~ a decrease in the adjustment for ~~recoveries. These items were~~recoveries and an increase in the allocation for highly-leveraged transactions partly offset by decreases in the allocations for large credit relationships, excessive industry concentrations and loans not reviewed by concurrence. Macroeconomic valuation allowances for commercial and industrial loans decreased $1.0 million from $10.6 million at December 31, 2018 to $9.6 million at March 31, 2019. The decrease was primarily related to a decrease in the general macroeconomic risk allocation ~~for excessive industry concentrations.~~(down $1.3 million), as further discussed below, partly offset by an increase in the environmental risk adjustment (up $298 thousand).

The reserve allocated to energy loans at ~~September 30, 2017~~March 31, 2019 decreased ~~$8.7~~$3.7 million compared to December 31, ~~2016.~~2018. As a result, reserves allocated to energy loans as a percentage of total energy loans totaled ~~3.74%~~1.63% at ~~September 30, 2017~~March 31, 2019 compared to ~~4.38%~~1.81% at December 31, ~~2016.~~2018. This decrease was primarily related to decreases in ~~historical~~all categories of valuation allowances. General valuation allowances ~~and macroeconomic valuation allowances and partly offset by increases in specific valuation allowances and general valuation allowances. Historical valuation allowances~~for energy loans decreased ~~$12.7~~$1.8 million from ~~$34.6~~$6.0 million at December 31, ~~2016~~2018 to ~~$21.9~~$4.2 million at ~~September 30, 2017.~~March 31, 2019. The decrease was primarily related to decreases in the ~~volume of classified energy loans~~allocations for highly-leveraged transactions and ~~higher risk categories of non-classified energy loans~~excessive industry concentrations partly offset by ~~increases~~a decrease in the adjustment for recoveries. Macroeconomic valuation allowances related to energy loans decreased $816 thousand from $3.7 million at December 31, 2018 to $2.9 million at March 31, 2019, due to a decrease in the environmental risk adjustment (down $419 thousand), as a result of decreases in the environmental adjustment factor and the historical loss valuation allowances to which the environmental risk adjustment factor is applied, and a decrease in the general macroeconomic risk allocation (down $397 thousand), as further discussed below. Specific valuation allowances for energy loans decreased $675 thousand from $9.7 million at December 31, 2018 to $9.0 million at March 31, 2019. Specific valuation allowances at both dates were related to four credit relationships reported as non-accrual loans totaling $39.9 million at December 31, 2018 and $39.2 million at March 31, 2019. The decrease in associated specific valuation allowances was primarily related to principal reductions on certain of these credits. We had net recoveries of energy loans totaling $47 thousand during the three months ended March 31, 2019 compared to net charge-offs of $2.8 million during the same period in 2018. Historical valuation allowances decreased $404 thousand from $9.7 million at December 31, 2018 to $9.3 million at March 31, 2019. The decrease was partly related to decreases in the historical loss allocation factors for both non-classified energy loans and classified energy loans. ~~Classified~~The decrease was also partly related to decreases in the volume of non-classified energy loans ~~totaled $190.7~~graded as "pass"(risk grades below 9) (down $93.5 million) and "special mention" (risk grade 10) (down $7.9 million) partly offset by increases in the volume of non-classified energy loans graded as "watch" (risk grade 9) (up $46.1 million) and classified energy loans graded as "substandard - accrual" (risk grade 11) (up $13.1 million). Total classified energy loans increased $11.8 million ~~at September 30, 2017 compared to $302.0~~from $72.4 million at December 31, ~~2016, decreasing $111.2 million. Non-classified energy loans graded as “watch” and “special mention” totaled $114.0~~2018 to $84.2 million at ~~September 30, 2017 compared to $229.4 million at December~~March 31, 2016, decreasing $115.4 million, while "pass" grade energy loans increased $227.7 million from $854.7 million at December 31, 2016 to $1.1 billion at September 30, 2017. As a result of these changes, the2019. The weighted-average risk grade of energy loans ~~decreased~~increased to ~~7.21~~6.35 at ~~September 30, 2017~~March 31, 2019 from ~~7.95~~6.22 at December 31, 2016. Macroeconomic valuation allowances related to energy loans decreased $6.4 million from $18.5 million at December 31, 2016 to $12.1 million at September 30, 2017, in part due to improving trends in the weighted-average risk grade of the energy loan portfolio and decreased oil price volatility. The price per barrel of crude oil was approximately $54 at December 31, 2016 and $52 at September 30, 2017. Despite the overall decrease, macroeconomic valuation allowances related to energy loans at September 30, 2017 were partly impacted by the effect of hurricane Harvey on our Houston and Corpus Christi market areas. Specific valuation allowances for energy loans increased $9.5 million from $3.8 million at December 31, 2016 to $13.3 million at September 30, 2017. Specific valuation allowances at September 30, 2017 were related to two credit relationships totaling $61.8 million while specific valuation allowances at December 31, 2016 were related to three credit relationships totaling $29.8 million. Energy loan net charge-offs totaled $10.0 million during the first nine months of 2017 compared to net charge-offs of $18.6 million during the first nine months of 2016. The charge-offs in 2017 included $10.0 million related to two credit relationships that, as of December 31, 2016, had associated specific valuation allowances totaling $3.4 million. General valuation allowances increased $908 thousand primarily due to an increase in the allocation for excessive industry concentrations partly offset by and increase in the adjustment for recoveries.2018.

The reserve allocated to commercial real estate loans at ~~September 30, 2017 increased $7.9~~March 31, 2019 decreased $2.3 million compared to December 31, ~~2016.~~2018. The ~~increase~~decrease was primarily related to ~~increases~~decreases in macroeconomic valuation allowances and ~~historical~~general valuation allowances. Macroeconomic valuation allowances ~~increased $6.7~~decreased $1.8 million from ~~$8.2~~$11.0 million at December 31, ~~2016~~2018 to ~~$14.9~~$9.2 million at ~~September 30, 2017.~~March 31, 2019. The ~~increase~~decrease was primarily related to ~~an increase~~a decrease in the general macroeconomic risk allocation ~~(up $6.3~~(down $1.4 million), as further discussed below, and a decrease in the environmental risk adjustment ~~(up $503~~(down $340 thousand)~~. The increase~~, primarily resulting from a decrease in ~~macroeconomic~~the environmental risk adjustment factor. General valuation allowances reflects current economic trends impacting our Houston market area which has been impacted by decreased construction, higher rent concessions and higher vacancy rates. Macroeconomic valuation allowances were also partly impacted by the effect of hurricane Harvey on our Houston and Corpus Christi market areas. Historical valuation allowances increased $1.3 million primarily due to an increase in the volume of non-classified commercial real estate loans. Non-classifiedfor commercial real estate loans ~~increased $267.5~~decreased $554 thousand from $4.4 million ~~from~~at December 31, ~~2016~~2018 to ~~September 30, 2017~~$3.8 million at March 31, 2019. The decrease was primarily ~~due~~related to ~~an increase~~decreases in allocations for large credit relationships, loans not reviewed by concurrence and policy exceptions. Specific valuation allowances and historical valuation allowances related to commercial real estate loans ~~graded as “pass.”~~did not significantly change during the first three months of 2019. Classified commercial real estate loans increased ~~$1.2 million~~$544 thousand from ~~$76.3~~$118.3 million at December 31, ~~2016~~2018 to ~~$77.5~~$118.8 million at ~~September 30, 2017 due to an increase in loans classified as “substandard - accrual” (risk grade 11).~~March 31, 2019. The weighted-average risk grade of commercial real estate loans was ~~6.98~~7.05 at ~~September 30, 2017 compared to 6.96 at~~both March 31, 2019 and December 31, ~~2016.~~2018.

The reserve allocated to consumer real estate loans at ~~September 30, 2017 increased $2.6 million~~March 31, 2019 decreased $442 thousand compared to December 31, ~~2016.~~2018. This ~~increase~~decrease was ~~mostly~~primarily due to a ~~$1.9 million increase~~$308 thousand decrease in macroeconomic valuation allowances, ~~which was partly impacted by the effect of hurricane Harvey on our Houston and Corpus Christi market areas,~~as further discussed below, and a ~~$534~~$117 thousand ~~increase~~decrease in ~~general~~historical valuation allowances, which was primarily related to ~~an increase in allowances allocated for loans not reviewed by concurrence and a decrease~~decreases in the ~~reduction for recoveries.~~historical loss allocation factors applied to consumer real estate loans.

The reserve allocated to consumer and other loans at ~~September 30, 2017~~March 31, 2019 increased ~~$4.0 million~~$700 thousand compared to December 31, ~~2016.~~2018. The increase was also primarily related to ~~increases in macroeconomic valuation allowances, historical valuation allowances and, to a lesser extent,~~ an increase in general valuation allowances. The increase in macroeconomic valuation allowances was related to a $2.7 million increase in the general macroeconomic allocation, which was primarily related to growth in unsecured personal lines of credit, and also partly impacted by the effect of hurricane Harvey on our Houston and Corpus Christi market

~~areas. The~~$854 thousand increase in historical valuation allowances ~~was~~ primarily due to an increase in the ~~volume of non-classified consumer and other loans. The~~historical loss allocation factor. This increase was partly offset by a decrease in ~~general~~macroeconomic valuation allowances ~~was~~(down $100 thousand), primarily related to ~~an increase in the allocation for loans not reviewed by concurrence and~~ a decrease in the ~~adjustment~~general macroeconomic risk allocation, as further discussed below.

As more fully discussed in our 2018 Form 10-K, under our allowance methodology, we allocate additional reserves for ~~recoveries.~~general macroeconomic risk in excess of our minimum calculated need using our allowance model. These additional reserves are based upon management's assessment of current and expected economic conditions, trends and other quantitative and qualitative portfolio risk factors that are external to us or that are not otherwise captured in our allowance modeling process but impact the credit risk or inherent losses within our loan portfolio segments. These additional reserves are allocated to our various portfolio segments based upon management judgment.

Activity in the allowance for loan losses is presented in the following table.


	Three Months Ended September 30,						Nine Months Ended September 30,						Three Months Ended March 31,
	2017			2016			2017			2016			2019			2018
Balance at beginning of period	$	149,558		$	149,714		$	153,045		$	135,859		$	132,132		$	155,364
Provision for loan losses	10,980			5,045			27,358			42,734			11,003			6,945
Charge-offs:
Commercial and industrial	(5,468		)	(4,036		)	(14,574		)	(10,754		)	(2,688		)	(9,252		)
Energy	—			(884		)	(10,595		)	(18,644		)	—			(2,850		)
Commercial real estate	—			(9		)	(14		)	(56		)	(60		)	(5		)
Consumer real estate	(766		)	(287		)	(779		)	(464		)	(1,778		)	(719		)
Consumer and other	(4,120		)	(3,300		)	(11,291		)	(9,276		)	(5,697		)	(3,972		)
Total charge-offs	(10,354		)	(8,516		)	(37,253		)	(39,194		)	(10,223		)	(16,798		)
Recoveries:
Commercial and industrial	903			957			2,419			2,577			750			1,577
Energy	451			19			585			21			47			1
Commercial real estate	268			277			790			875			90			88
Consumer real estate	137			92			357			442			89			193
Consumer and other	2,360			2,185			7,002			6,459			2,462			2,515
Total recoveries	4,119			3,530			11,153			10,374			3,438			4,374
Net charge-offs	(6,235		)	(4,986		)	(26,100		)	(28,820		)	(6,785		)	(12,424		)
Balance at end of period	$	154,303		$	149,773		$	154,303		$	149,773		$	136,350		$	149,885

Ratio of allowance for loan losses to:
Total loans	1.21		%	1.29		%	1.21		%	1.29		%	0.95		%	1.12		%
Non-accrual loans	107.83			154.67			107.83			154.67			147.95			121.71
Ratio of annualized net charge-offs to average total loans	0.20			0.17			0.28			0.33			0.19			0.38

The provision for loan losses ~~decreased $15.4~~increased $4.1 million, or ~~36.0%~~58.4%, during the ~~nine~~three months ended ~~September 30, 2017~~March 31, 2019 compared to the same period in ~~2016.~~2018. The ~~level of the~~ provision for loan losses ~~in 2016 was reflective~~during the three months ended March 31, 2019 primarily reflects the level of ~~a significant increase in the volume of classified energy loans,~~net charge-offs and specific valuation allowances ~~taken on certain~~as well as the impact of an increase in classified ~~energy~~ loans and ~~increases~~the overall growth in the ~~weighted-average risk grades of our energy, commercial~~loan portfolio since December 31, 2018. Net charge-offs totaled $6.8 million for three months ended March 31, 2019 compared to $12.4 million for the same period in 2018. Specific valuation allowances totaled $20.0 million at March 31, 2019 compared to $16.2 million at December 31, 2018 and ~~industrial and commercial real estate loan portfolios.~~$23.4 million at March 31, 2018. Classified energy, commercial and industrial and commercial real estate loans totaled ~~$418.7~~$313.0 million at ~~September 30, 2017~~March 31, 2019 compared to ~~$510.1~~$269.6 million at December 31, ~~2016~~2018 and ~~$498.7~~$369.3 million at September 30, 2016. Specific valuation allowances related to energy, commercial and industrial and commercial real estate loans totaled $14.9 million at September 30, 2017 compared to $9.2 million at DecemberMarch 31, ~~2016 and $7.8 million at September 30, 2016.~~2018. The overall weighted-average risk grade of our energy, commercial and industrial and commercial real estate loan portfolios was ~~6.76~~6.66 at ~~September 30, 2017~~March 31, 2019 compared to ~~6.84~~6.63 at December 31, ~~2016~~2018 and ~~6.85~~6.76 at September 30, 2016. The level of the provision for loan losses during 2017 was mostly reflective of the level of net charge-offs during during the nine months ended September 30, 2017, which totaled $26.1 million. These charge-offs were mostly related to six credit relationships, as discussed above. March 31, 2018.

The ratio of the allowance for loan losses to total loans was ~~1.21%~~0.95% at ~~September 30, 2017~~March 31, 2019 compared to ~~1.28%~~0.94% at December 31, ~~2016.~~2018. Management believes the recorded amount of the allowance for loan losses is appropriate based upon management’s best estimate of probable losses that have been incurred within the existing portfolio of loans. Should any of the factors considered by management in evaluating the appropriate level of the allowance for loan losses change, our estimate of probable loan losses could also change, which could affect the level of future provisions for loan losses.

Capital and Liquidity

Capital. Shareholders’ equity totaled ~~$3.2~~$3.6 billion at ~~September 30, 2017~~March 31, 2019 and ~~$3.0~~$3.4 billion December 31, ~~2016.~~2018. In addition to net income of ~~$263.6~~$116.5 million, other sources of capital during the ~~nine~~three months ended ~~September 30, 2017~~March 31, 2019 included ~~$82.3 million of~~ other comprehensive income, net of tax, ~~$45.4~~of $157.4 million; $4.9 million in proceeds from stock option ~~exercises~~exercises; and ~~$9.0~~$3.7 million related to stock-based compensation. Uses of capital during the ~~nine~~three months ended ~~September 30, 2017~~March 31, 2019 included ~~$113.8~~$44.6 million of dividends paid on preferred and common ~~stock.~~stock and $12.6 million related to the cumulative effect of a new accounting principle adopted during the first quarter of 2019. See Note 1 - Significant Accounting Policies.

The accumulated other comprehensive income/loss component of shareholders’ equity totaled a net, after-tax, unrealized gain of ~~$57.7~~$93.8 million at ~~September 30, 2017~~March 31, 2019 compared to a net, after-tax, unrealized loss of ~~$24.6~~$63.6 million at December 31, ~~2016.~~2018. The change was primarily due to ~~an $85.3~~a $156.5 million net, after-tax, ~~increase~~change in the net unrealized ~~gain~~gain/loss on securities available for sale.

Under the Basel III Capital Rules, we have elected to opt-out of the requirement to include most components of accumulated other comprehensive income in regulatory capital. Accordingly, amounts reported as accumulated other comprehensive income/loss do not increase or reduce regulatory capital and are not included in the calculation of risk-based capital and leverage ratios. Regulatory agencies for banks and bank holding companies utilize capital guidelines designed to measure capital and take into consideration the risk inherent in both on-balance sheet and off-balance sheet items. See Note 87 - Capital and Regulatory Matters in the accompanying notes to consolidated financial statements included elsewhere in this report.

We paid a quarterly dividend of ~~$0.54, $0.57~~$0.67 and $0.57 per common share during the first ~~second and third~~ quarters of ~~2017, respectively,~~2019 and ~~a quarterly dividend of $0.53, $0.54 and $0.54 per common share during the first, second and third quarters of 2016,~~2018, respectively. This equates to a common stock dividend payout ratio of ~~41.8%~~37.2% and ~~46.9%~~35.0% during the first ~~nine~~three months of ~~2017~~2019 and ~~2016,~~2018, respectively. Our ability to declare or pay dividends on, or purchase, redeem or otherwise acquire, shares of our capital stock may be impacted by certain restrictions ~~under the terms of our junior subordinated deferrable interest debentures and our Series A Preferred Stock as~~ described in Note 87 - Capital and Regulatory Matters in the accompanying notes to consolidated financial statements included elsewhere in this report.

Stock Repurchase Plans. From time to time, our board of directors has authorized stock repurchase plans. In general, stock repurchase plans allow us to proactively manage our capital position and return excess capital to shareholders. Shares purchased under such plans also provide us with shares of common stock necessary to satisfy obligations related to stock compensation awards. On October ~~27, 2016,~~24, 2017, our board of directors authorized a ~~$100.0~~$150.0 million stock repurchase program, allowing us to repurchase shares of our common stock over a ~~two-year~~two year period from time to time at various prices in the open market or through private transactions. ~~During~~No shares were repurchased under this plan during the ~~third~~first quarter of ~~2017,~~2019 while we repurchased ~~1,134,966~~1,027,292 shares ~~under the plan~~ at a total cost of $100.0 ~~million. On October 24, 2017, our board~~million during the fourth quarter of ~~directors authorized a new $150.0 million stock repurchase plan allowing us to repurchase shares of our common stock over a two-year period from time to time at various prices~~2018. See Note 7 - Capital and Regulatory Matters in the ~~open market or through private transactions. See~~accompanying notes to consolidated financial statements and Part II, Item 2 - Unregistered Sales of Equity Securities and Use of Proceeds, each included elsewhere in this report.

Liquidity. As more fully discussed in our ~~2016~~2018 Form 10-K, our liquidity position is continuously monitored and adjustments are made to the balance between sources and uses of funds as deemed appropriate. Liquidity risk management is an important element in our asset/liability management process. We regularly model liquidity stress scenarios to assess potential liquidity outflows or funding problems resulting from economic disruptions, volatility in the financial markets, unexpected credit events or other significant occurrences deemed problematic by management. These scenarios are incorporated into our contingency funding plan, which provides the basis for the identification of our liquidity needs. As of ~~September 30, 2017,~~March 31, 2019, management is not aware of any events that are reasonably likely to have a material adverse effect on our liquidity, capital resources or operations. ~~In addition, management is not aware of any regulatory recommendations regarding liquidity, that would have a material adverse effect on us.~~

Since Cullen/Frost is a holding company and does not conduct operations, its primary sources of liquidity are dividends upstreamed from Frost Bank and borrowings from outside sources. Banking regulations may limit the amount of dividends that may be paid by Frost Bank. See Note 87 - Capital and Regulatory Matters in the accompanying notes to consolidated financial statements included elsewhere in this report regarding such dividends. At ~~September 30, 2017,~~March 31, 2019, Cullen/Frost had liquid assets, including cash and resell agreements, totaling ~~$241.3~~$256.7 million.

Accounting Standards Updates

See Note 1817 - Accounting Standards Updates in the accompanying notes to consolidated financial statements included elsewhere in this report for details of recently issued accounting pronouncements and their expected impact on our financial statements.

Consolidated Average Balance Sheets and Interest Income Analysis - ~~Quarter~~Year To Date

(Dollars in thousands - taxable-equivalent basis)


	September 30, 2017							September 30, 2016							March 31, 2019							March 31, 2018
	Average Balance			Interest Income/ Expense		Yield/ Cost		Average Balance			Interest Income/ Expense		Yield/ Cost		Average Balance			Interest Income/ Expense		Yield/ Cost		Average Balance			Interest Income/ Expense		Yield/ Cost
Assets:
Interest-bearing deposits	$	3,351,576		$	10,800	1.28	%	$	3,190,306		$	4,111	0.51	%	$	1,728,982		$	10,639	2.50	%	$	3,682,909		$	14,094	1.55	%
Federal funds sold and resell agreements	72,239			244		1.34		28,152			48		0.68		249,946			1,588		2.58		186,278			761		1.66
Securities:
Taxable	4,970,647			23,203		1.88		5,391,848			25,897		1.97		4,540,814			24,679		2.19		4,167,397			20,558		1.99
Tax-exempt	7,360,643			96,912		5.34		6,983,626			92,917		5.53		8,229,430			82,475		4.03		7,671,186			78,334		4.12
Total securities	12,331,290			120,115		3.94		12,375,474			118,814		3.97		12,770,244			107,154		3.37		11,838,583			98,892		3.36
Loans, net of unearned discounts	12,587,290			141,622		4.46		11,457,464			115,674		4.02		14,205,191			186,650		5.33		13,294,638			152,367		4.65
Total Earning Assets and Average Rate Earned	28,342,395			272,781		3.85		27,051,396			238,647		3.57		28,954,363			306,031		4.27		29,002,408			266,114		3.71
Cash and due from banks	483,497							487,456							522,701							511,948
Allowance for loan losses	(152,237		)					(152,549		)					(133,647		)					(156,517		)
Premises and equipment, net	522,413							564,764							735,090							523,576
Accrued interest and other assets	1,194,316							1,180,987							1,277,795							1,249,881
Total Assets	$	30,390,384						$	29,132,054						$	31,356,302						$	31,131,296

Liabilities:
Non-interest-bearing demand deposits:
Commercial and individual	$	10,159,636						$	9,225,059						$	9,634,087						$	10,282,274
Correspondent banks	233,748							292,971							205,735							224,935
Public funds	362,779							484,543							352,467							464,850
Total non-interest-bearing demand deposits	10,756,163							10,002,573							10,192,289							10,972,059
Interest-bearing deposits:
Private accounts
Savings and interest checking	6,344,476			347		0.02		5,948,616			264		0.02		6,773,862			1,472		0.09		6,635,495			1,137		0.07
Money market deposit accounts	7,501,285			4,513		0.24		7,473,650			1,170		0.06		7,695,514			20,640		1.09		7,590,194			7,698		0.41
Time accounts	766,339			412		0.21		807,055			278		0.14		895,464			3,156		1.43		778,309			984		0.51
Public funds	381,632			396		0.41		420,281			37		0.03		554,415			1,906		1.39		452,767			819		0.73
Total interest-bearing deposits	14,993,732			5,668		0.15		14,649,602			1,749		0.05		15,919,255			27,174		0.69		15,456,765			10,638		0.28
Total deposits	25,749,895							24,652,175							26,111,544							26,428,824
Federal funds purchased and repurchase agreements	1,005,486			523		0.21		797,417			44		0.02		1,180,163			5,016		1.72		1,050,410			634		0.24
Junior subordinated deferrable interest debentures	136,164			1,020		3.00		136,107			839		2.47		136,251			1,498		4.40		136,193			1,142		3.35
Subordinated notes payable and other notes	98,498			1,164		4.73		99,948			350		1.40		98,733			1,164		4.72		98,576			1,164		4.72
Total Interest-Bearing Funds and Average Rate Paid	16,233,880			8,375		0.21		15,683,074			2,982		0.08		17,334,402			34,852		0.81		16,741,944			13,578		0.33
Accrued interest and other liabilities	168,572							285,585							388,743							161,855
Total Liabilities	27,158,615							25,971,232							27,915,434							27,875,858
Shareholders’ Equity	3,231,769							3,160,822							3,440,868							3,255,438
Total Liabilities and Shareholders’ Equity	$	30,390,384						$	29,132,054						$	31,356,302						$	31,131,296
Net interest income				$	264,406						$	235,665						$	271,179						$	252,536
Net interest spread						3.64	%						3.49	%						3.46	%						3.38	%
Net interest income to total average earning assets						3.73	%						3.53	%						3.79	%						3.52	%

For these computations: (i) average balances are presented on a daily average basis, (ii) information is shown on a taxable-equivalent basis assuming a ~~35%~~21% tax rate, (iii) average loans include loans on non-accrual status, and (iv) average securities include unrealized gains and losses on securities available for sale while yields are based on average amortized cost.

~~Consolidated Average Balance Sheets and Interest Income Analysis - Year To Date~~

~~(Dollars in thousands - taxable-equivalent basis)~~

September 30, 2017 September 30, 2016
Average
Balance Interest
Income/
Expense Yield/
Cost Average
Balance Interest
Income/
Expense Yield/
Cost
Assets:
Interest-bearing deposits $ 3,341,710
$ 26,712
1.07 % $ 2,956,822
$ 11,366
0.51 %
Federal funds sold and resell agreements 56,581
514
1.21
34,179
165
0.64
Securities:
Taxable 5,112,072
72,032
1.90
5,245,649
77,402
2.02
Tax-exempt 7,309,739
293,888
5.39
6,660,843
270,586
5.58
Total securities 12,421,811
365,920
3.96
11,906,492
347,988
4.01
Loans, net of unearned discounts 12,319,125
397,817
4.32
11,497,340
344,289
4.00
Total Earning Assets and Average Rate Earned 28,139,227
790,963
3.77
26,394,833
703,808
3.60
Cash and due from banks 503,818
504,074

Allowance for loan losses (152,604 ) (151,643 )
Premises and equipment, net 522,768
561,215

Accrued interest and other assets 1,211,309
1,180,513

Total Assets $ 30,224,518
$ 28,488,992

Liabilities:
Non-interest-bearing demand deposits:
Commercial and individual $ 10,054,481
$ 9,055,750

Correspondent banks 253,567
322,495

Public funds 417,555
515,195

Total non-interest-bearing demand deposits 10,725,603
9,893,440

Interest-bearing deposits:
Private accounts
Savings and interest checking 6,352,986
892
0.02
5,610,695
778
0.02
Money market deposit accounts 7,454,421
6,929
0.12
7,441,626
3,545
0.06
Time accounts 777,202
1,040
0.18
813,297
853
0.14
Public funds 433,395
848
0.26
452,655
133
0.04
Total interest-bearing deposits 15,018,004
9,709
0.09
14,318,273
5,309
0.05
Total deposits 25,743,607
24,211,713

Federal funds purchased and repurchase agreements 942,400
849
0.12
734,022
152
0.03
Junior subordinated deferrable interest debentures 136,150
2,890
2.83
136,092
2,392
2.34
Subordinated notes payable and other notes 87,173
2,696
4.12
99,918
958
1.28
Total Interest-Bearing Funds and Average Rate Paid 16,183,727
16,144
0.13
15,288,305
8,811
0.08
Accrued interest and other liabilities 161,643
259,131

Total Liabilities 27,070,973
25,440,876

Shareholders’ Equity 3,153,545
3,048,116

Total Liabilities and Shareholders’ Equity $ 30,224,518
$ 28,488,992

Net interest income $ 774,819
$ 694,997

Net interest spread 3.64 % 3.52 %
Net interest income to total average earning assets 3.69 % 3.56 %

For these computations: (i) average balances are presented on a daily average basis, (ii) information is shown on a taxable-equivalent basis assuming a 35% tax rate, (iii) average loans include loans on non-accrual status, and (iv) average securities include unrealized gains and losses on securities available for sale while yields are based on average amortized cost.

Item 3. Quantitative and Qualitative Disclosures About Market Risk

The disclosures set forth in this item are qualified by the section captioned “Forward-Looking Statements and Factors that Could Affect Future Results” included in Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations of this report and other cautionary statements set forth elsewhere in this report.

Refer to the discussion of market risks included in Item 7A. Quantitative and Qualitative Disclosures About Market Risk in the ~~2016~~2018 Form 10-K. There has been no significant change in the types of market risks we face since December 31, ~~2016.~~2018.

We utilize an earnings simulation model as the primary quantitative tool in measuring the amount of interest rate risk associated with changing market rates. The model quantifies the effects of various interest rate scenarios on projected net interest income and net income over the next 12 months. The model measures the impact on net interest income relative to a flat-rate case scenario of hypothetical fluctuations in interest rates over the next 12 months. These simulations incorporate assumptions regarding balance sheet growth and mix, pricing and the repricing and maturity characteristics of the existing and projected balance sheet. The impact of interest rate derivatives, such as interest rate swaps, caps and floors, is also included in the model. Other interest rate-related risks such as prepayment, basis and option risk are also considered.

For modeling purposes, as of ~~September 30, 2017,~~March 31, 2019, the model simulations projected that 100 and 200 basis point ratable increases in interest rates would result in positive variances in net interest income of ~~1.2%~~0.2% and ~~3.3%~~1.2%, respectively, relative to the flat-rate case over the next 12 months, while 100 and ~~125~~200 basis point ratable decreases in interest rates would result in a negative variances in net interest income of ~~5.1%~~2.5% and ~~9.9%~~7.3%, respectively, relative to the flat-rate case over the next 12 months. The ~~September 30, 2017~~March 31, 2019 model simulations for increased interest rates were impacted by the assumption, for modeling purposes, that we will begin to pay interest on commercial demand deposits (those not already receiving an earnings credit rate) in the ~~fourth~~second quarter of ~~2017,~~2019, as further discussed below. For modeling purposes, as of ~~September 30, 2016,~~March 31, 2018, the model simulations projected that 100 and 200 basis point ratable increases in interest rates would result in positive variances in net interest income of ~~0.4%~~0.9% and ~~1.5%~~2.8%, respectively, relative to the flat-rate case over the next 12 months, while ~~a decrease~~100 and 175 basis point ratable decreases in interest rates ~~of 50 basis points~~ would result in a negative variance in net interest income of ~~6.5%~~3.7% and 9.7%, respectively, relative to the flat-rate case over the next 12 months. The ~~September 30, 2016~~March 31, 2018 model simulations for increased interest rates were impacted by the assumption, for modeling purposes, that we would begin to pay interest on commercial demand deposits (those not already receiving an earnings credit rate) in the ~~fourth~~second quarter of ~~2016,~~2018, as further discussed below. The likelihood of a decrease in interest rates beyond ~~125~~175 basis points as of ~~September 30, 2017 and 50 basis points as of September 30, 2016~~March 31, 2018 was considered to be remote given prevailing interest rate levels.

The model simulations as of ~~September 30, 2017~~March 31, 2019 indicate that our balance sheet is ~~more~~less asset sensitive in comparison to our balance sheet as of ~~September 30, 2016.~~March 31, 2018. The shift to a ~~more~~less asset sensitive position was primarily due to ~~increases~~a decrease in the relative proportion of interest-bearing deposits and federal funds sold to projected average interest-earning assets. ~~Federal~~Interest-bearing deposits and federal funds sold are more immediately impacted by changes in interest rates in comparison to our other categories of earning assets.

~~Financial regulatory reform legislation entitled~~ Additionally, our model simulations in 2019 assume that the ~~“Dodd-Frank Wall Street Reform and Consumer Protection Act” (the “Dodd-Frank Act”) repealed~~full impact of increases in the federal ~~prohibition~~funds rate will not be reflected in the yields earned on interest-bearing deposits maintained at the ~~payment of interest on demand deposits, thereby permitting depository institutions to~~Federal Reserve.

We do not currently pay interest on ~~business transaction and other accounts beginning July 21, 2011. To date, we have not experienced any~~a significant ~~additional interest costs as a result of the repeal. However, in light of recent increases in market interest rates, in late July 2017, we increased the interest rates we pay on most~~portion of our ~~interest-bearing deposit products.~~commercial demand deposits. If we began to pay interest on commercial demand deposits (those not already receiving an earnings credit rate), our balance sheet would likely become less asset sensitive. ~~Because the~~Any interest rate that ~~will~~would ultimately be paid on these commercial demand deposits ~~depends~~would likely depend upon a variety of factors, some of which are beyond our ~~control,~~control. For modeling purposes, we have assumed an aggressive pricing structure ~~for the purposes of the model simulations discussed above~~ with interest payments for commercial demand deposits (those not already receiving an earnings credit) beginning in the ~~fourth quarter~~second quarters of ~~2017.~~2018 and 2019, respectively, for each simulation. Should the actual interest rate paid on commercial demand deposits be less than the rate assumed in the model simulations, or should the interest rate paid for commercial demand deposits become an administered rate with less direct correlation to movements in general market interest rates, our balance sheet could be more asset sensitive than the model simulations might otherwise indicate.

As of ~~September 30, 2017,~~March 31, 2019, the effects of a 200 basis point increase and a ~~125~~200 basis point decrease in interest rates on our derivative holdings would not result in a significant variance in our net interest income.

The effects of hypothetical fluctuations in interest rates on our securities classified as “trading” under ASC Topic 320, “Investments—Debt and Equity Securities,” are not significant, and, as such, separate quantitative disclosure is not presented.

Item 4. Controls and Procedures

As of the end of the period covered by this Quarterly Report on Form 10-Q, an evaluation was carried out by management, with the participation of its Chief Executive Officer and Chief Financial Officer, of the effectiveness of our disclosure controls and procedures (as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934). Based upon that evaluation, the Chief Executive Officer and Chief Financial Officer concluded that the disclosure controls and procedures were effective as of the end of the period covered by this report. No change in our internal control over financial reporting (as defined in Rule 13a-15(f) under the Securities Exchange Act of 1934) occurred during the last fiscal quarter that materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

Part II. Other Information

Item 1. Legal Proceedings

We are subject to various claims and legal actions that have arisen in the course of conducting business. Management does not expect the ultimate disposition of these matters to have a material adverse impact on our financial statements.

Item 1A. Risk Factors

There has been no material change in the risk factors disclosed under Item 1A. of our ~~2016~~2018 Form 10-K.

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

The following table provides information with respect to purchases we made or were made on our behalf or any “affiliated purchaser” (as defined in Rule 10b-18(a)(3) under the Securities Exchange Act of 1934), of our common stock during the three months ended ~~September 30, 2017.~~March 31, 2019. Dollar amounts in thousands.

Period
Total Number of
Shares Purchased

Average Price
Paid Per Share

Total Number of
Shares Purchased
as Part of Publicly
Announced Plan

Maximum
Number of Shares
(or Approximate
Dollar Value)
That May Yet Be
Purchased Under
the Plan at the
End of the Period
July 1, 2017 to July 31, 2017 169,342
$ 91.11
169,342
$ 84,572
August 1, 2017 to August 31, 2017 614,493
88.69
614,493
30,070
September 1, 2017 to September 30, 2017 351,131
85.64
351,131
—
Total 1,134,966
$ 88.11
1,134,966



Period	Total Number of Shares Purchased		Average Price Paid Per Share		Total Number of Shares Purchased as Part of Publicly Announced Plan	Maximum Number of Shares (or Approximate Dollar Value) That May Yet Be Purchased Under the Plan at the End of the Period
January 1, 2019 to January 31, 2019	—		$	—	—	$	50,000
February 1, 2019 to February 28, 2019	—		—		—	50,000
March 1, 2019 to March 31, 2019	5,351	⁽¹⁾	97.07		—	50,000
Total	5,351		$	97.07	—


(1)	All of these repurchases were made in connection with the vesting of certain share awards.

Item 3. Defaults Upon Senior Securities

None.

Item 4. Mine Safety Disclosures

None.

Item 5. Other Information

None.

Item 6. Exhibits

(a) Exhibits



Exhibit Number	Description
31.1	Rule 13a-14(a) Certification of the Corporation's Chief Executive Officer
31.2	Rule 13a-14(a) Certification of the Corporation's Chief Financial Officer
32.1+	Section 1350 Certification of the Corporation's Chief Executive Officer
32.2+	Section 1350 Certification of the Corporation's Chief Financial Officer
101	Interactive Data File - The instance document does not appear in the interactive data file because its XBRL tags are embedded within the inline XBRL document.


+	This exhibit shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, or otherwise subject to the liability of that section, and shall not be deemed to be incorporated by reference into any filing under the Securities Act of 1933 or the Securities Exchange Act of 1934.

Signatures

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




		Cullen/Frost Bankers, Inc.
		(Registrant)

Date:	~~October 26, 2017~~April 25, 2019	By:	/s/ Jerry Salinas
			Jerry Salinas
			Group Executive Vice President
			and Chief Financial Officer
			(Duly Authorized Officer, Principal Financial
			Officer and Principal Accounting Officer)

6055



	Nine Months Ended September 30, 2017				Nine Months Ended September 30, 2016
	Balance at Restructure		Balance at Period-End		Balance at Restructure		Balance at Period-End
Commercial and industrial	$	4,026	$	3,875	$	510	$	505
Energy	56,097		55,023		73,977		31,918
Commercial real estate:
Buildings, land and other	—		—		1,455		1,455
Construction	—		—		243		221
	$	60,123	$	58,898	$	76,185	$	34,099



Remainder of 2017	$	402
2018	1,424
2019	1,167
2020	918
2021	697
Thereafter	867
	$	5,475



Stock options	$	6,952
Non-vested stock awards/stock units	7,448
Performance stock units	2,202
Total	$	16,602



	Three Months Ended September 30, 2017									Three Months Ended September 30, 2016
	Before Tax Amount			Tax Expense, (Benefit)			Net of Tax Amount			Before Tax Amount			Tax Expense, (Benefit)			Net of Tax Amount
Securities available for sale and transferred securities:
Change in net unrealized gain/loss during the period	$	7,082		$	2,479		$	4,603		$	(95,641	)	$	(33,473	)	$	(62,168	)
Change in net unrealized gain on securities transferred to held to maturity	(3,514		)	(1,230		)	(2,284		)	(7,278		)	(2,547		)	(4,731		)
Reclassification adjustment for net (gains) losses included in net income	4,867			1,703			3,164			37			12			25
Total securities available for sale and transferred securities	8,435			2,952			5,483			(102,882		)	(36,008		)	(66,874		)
Defined-benefit post-retirement benefit plans:
Change in the net actuarial gain/loss	—			—			—			—			—			—
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit)	1,357			475			882			1,585			555			1,030
Total defined-benefit post-retirement benefit plans	1,357			475			882			1,585			555			1,030
Total other comprehensive income (loss)	$	9,792		$	3,427		$	6,365		$	(101,297	)	$	(35,453	)	$	(65,844	)

	Nine Months Ended September 30, 2017									Nine Months Ended September 30, 2016
	Before Tax Amount			Tax Expense, (Benefit)			Net of Tax Amount			Before Tax Amount			Tax Expense, (Benefit)			Net of Tax Amount
Securities available for sale and transferred securities:
Change in net unrealized gain/loss during the period	$	131,283		$	45,949		$	85,334		$	191,865		$	67,154		$	124,711
Change in net unrealized gain on securities transferred to held to maturity	(13,660		)	(4,781		)	(8,879		)	(24,629		)	(8,620		)	(16,009		)
Reclassification adjustment for net (gains) losses included in net income	4,917			1,721			3,196			(14,866		)	(5,204		)	(9,662		)
Total securities available for sale and transferred securities	122,540			42,889			79,651			152,370			53,330			99,040
Defined-benefit post-retirement benefit plans:
Change in the net actuarial gain/loss	—			—			—			(862		)	(302		)	(560		)
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit)	4,072			1,425			2,647			4,878			1,708			3,170
Total defined-benefit post-retirement benefit plans	4,072			1,425			2,647			4,016			1,406			2,610
Total other comprehensive income (loss)	$	126,612		$	44,314		$	82,298		$	156,386		$	54,736		$	101,650