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Significant Accounting Policies | 9 Months Ended
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Sep. 30, 2016
Accounting Policies [Abstract] |
Significant Accounting Policies | 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, 2015, included in our Annual Report on Form 10-K filed with the SEC on February 4, 2016 (the “2015 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:
| Nine Months Ended September 30,
| 2016 |  | 2015
Cash paid for interest | $ | 8,731 |  |  | $ | 9,906 |
Cash paid for income taxes | 39,160 |  |  | 35,300 |
Significant non-cash transactions: |  |  |
Securities purchased not yet settled | 54,342 |  |  | 3,428 |
Loans foreclosed and transferred to other real estate owned and foreclosed assets | 422 |  |  | 826 |
Loans to facilitate the sale of other real estate owned | — |  |  | 20 |
Accounting Changes, Reclassifications and Restatements. Certain items in prior financial statements have been reclassified to conform to the current presentation. In that regard, in connection with the adoption of ASU 2015-03, “Interest - Imputation of Interest (Subtopic 835-30) - Simplifying the presentation of Debt Issuance Costs,” which requires unamortized debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, our consolidated balance sheet as of December 31, 2015 reflects a $1.2 million decrease in accrued interest receivable and other assets, a $1.0 million decrease in junior subordinated deferrable interest debentures and a $130 thousand decrease in other long-term borrowings. Additionally, during the third quarter of 2016, we elected to adopt the provisions of ASU 2016-09, “Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting,” in advance of the required application date of January 1, 2017. Our financial statements for the three and nine months ended September 30, 2016 are presented as if we adopted ASU 2016-09 on January 1, 2016. ASU 2016-09 requires that all income tax effects related to settlements of share-based payment awards be reported in earnings as an increase (or decrease) to income tax expense. Previously, income tax benefits at settlement of an award were reported as an increase (or decrease) to additional paid-in capital to the extent that those benefits were greater than (or less than) the income tax benefits recognized in earnings during the award's vesting period. The requirement to report those income tax effects in earnings has been applied to settlements occurring on or after January 1, 2016 and the impact of applying that guidance reduced reported income tax expense by $1.5 million, or approximately $0.02 per diluted common share, and $1.6 million, or approximately $0.03 per diluted common share, for the three and nine months ended September 30, 2016, respectively. ASU 2016-09 also requires that all income tax-related cash flows resulting from share-based payments be reported as operating activities in the statement of cash flows. Previously, income tax benefits at settlement of an award were reported as a reduction to operating cash flows and an increase to financing cash flows to the extent that those benefits exceeded the income tax benefits reported in earnings during the award's vesting period. We have elected to apply that change in cash flow classification on a retrospective basis, which has resulted in an $880 thousand increase to net cash from operating activities and a corresponding decrease to net cash from financing activities in the accompanying consolidated statement of cash flows for the nine months ended September 30, 2015, as compared to the amounts previously reported. In connection with the adoption of ASU 2016-09, we have also elected to change our accounting policy to recognize forfeitures as they occur. The impact of this change and that of the remaining provisions of ASU 2016-09 did not have significant impact on our financial statements.

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