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Condensed Financial Statements of Parent Company | 12 Months Ended
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Dec. 31, 2017
Condensed Financial Information of Parent Company Only Disclosure [Abstract] |
Condensed Financial Statements of Parent Company | Condensed Financial Statements of Parent Company Condensed financial statements pertaining only to Cullen/Frost Bankers, Inc. are presented below. Investments in subsidiaries are stated using the equity method of accounting. Condensed Balance Sheets
| December 31,
| 2017 |  | 2016
Assets: |  |  |
Cash | $ | 9,301 |  |  | $ | 9,854 |
Resell agreements | 256,000 |  |  | 279,270 |
Total cash and cash equivalents | 265,301 |  |  | 289,124 |
Investment in subsidiaries | 3,274,921 |  |  | 2,949,346 |
Accrued interest receivable and other assets | 3,006 |  |  | 5,799 |
Total assets | $ | 3,543,228 |  |  | $ | 3,244,269 |
Liabilities: |  |  |
Junior subordinated deferrable interest debentures, net of unamortized issuance costs | $ | 136,184 |  |  | $ | 136,127 |
Subordinated notes, net of unamortized issuance costs | 98,552 |  |  | 99,990 |
Accrued interest payable and other liabilities | 10,629 |  |  | 5,624 |
Total liabilities | 245,365 |  |  | 241,741 |
Shareholders’ Equity | 3,297,863 |  |  | 3,002,528 |
Total liabilities and shareholders’ equity | $ | 3,543,228 |  |  | $ | 3,244,269 |
Condensed Statements of Income
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Income: |  |  |  |  |
Dividend income paid by Frost Bank | $ | 149,671 |  |  | $ | 141,377 |  |  | $ | 126,375 |
Dividend income paid by non-banks | 915 |  |  | 895 |  |  | 1,830 |
Interest and other income | 421 |  |  | 33 |  |  | 82 |
Total income | 151,007 |  |  | 142,305 |  |  | 128,287 |
Expenses: |  |  |  |  |
Interest expense | 7,815 |  |  | 4,624 |  |  | 3,673 |
Salaries and employee benefits | 1,202 |  |  | 1,828 |  |  | 1,376 |
Other | 6,373 |  |  | 5,933 |  |  | 5,727 |
Total expenses | 15,390 |  |  | 12,385 |  |  | 10,776 |
Income before income taxes and equity in undistributed earnings of subsidiaries | 135,617 |  |  | 129,920 |  |  | 117,511 |
Income tax benefit | 7,092 |  |  | 7,015 |  |  | 6,062 |
Equity in undistributed earnings of subsidiaries | 221,440 |  |  | 167,326 |  |  | 155,755 |
Net income | 364,149 |  |  | 304,261 |  |  | 279,328 |
Preferred stock dividends | 8,063 |  |  | 8,063 |  |  | 8,063 |
Net income available to common shareholders | $ | 356,086 |  |  | $ | 296,198 |  |  | $ | 271,265 |
Condensed Statements of Cash Flows
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Operating Activities: |  |  |  |  |
Net income | $ | 364,149 |  |  | $ | 304,261 |  |  | $ | 279,328 |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |
Equity in undistributed earnings of subsidiaries | (221,440 | ) |  | (167,326 | ) |  | (155,755 | )
Stock-based compensation | 519 |  |  | 520 |  |  | 480 |
Net tax benefit from stock-based compensation | 318 |  |  | 185 |  |  | 161 |
Net change in other assets and other liabilities | 7,665 |  |  | (940 | ) |  | 2,460 |
Net cash from operating activities | 151,211 |  |  | 136,700 |  |  | 126,674 |
Investing Activities: |  |  |  |  |
Redemption of investment in Frost Securities, Inc. | — |  |  | — |  |  | 216 |
Net cash from investing activities | — |  |  | — |  |  | 216 |
Financing Activities: |  |  |  |  |
Proceeds from issuance of subordinated notes | 98,434 |  |  | — |  |  | — |
Principal payments on subordinated notes | (100,000 | ) |  | — |  |  | — |
Proceeds from stock option exercises | 67,746 |  |  | 78,866 |  |  | 14,853 |
Proceeds from stock-based compensation activities of subsidiaries | 12,494 |  |  | 11,279 |  |  | 12,257 |
Purchase of treasury stock | (101,473 | ) |  | (1,290 | ) |  | (101,237 | )
Cash dividends paid on preferred stock | (8,063 | ) |  | (8,063 | ) |  | (8,063 | )
Cash dividends paid on common stock | (144,172 | ) |  | (134,902 | ) |  | (132,161 | )
Net cash from financing activities | (175,034 | ) |  | (54,110 | ) |  | (214,351 | )
Net change in cash and cash equivalents | (23,823 | ) |  | 82,590 |  |  | (87,461 | )
Cash and cash equivalents at beginning of year | 289,124 |  |  | 206,534 |  |  | 293,995 |
Cash and cash equivalents at end of year | $ | 265,301 |  |  | $ | 289,124 |  |  | $ | 206,534 |

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- Definition The entire disclosure for condensed financial information, including the financial position, cash flows, and the results of operations of the registrant (parent company) as of the same dates or for the same periods for which audited consolidated financial statements are being presented. Alternatively, the details of this disclosure can be reported by the specific parent company taxonomy elements, indicating the appropriate date and period contexts in an instance document. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.7-05(c)(Schedule II)) -URI http://asc.fasb.org/extlink&oid=6879921&loc=d3e569147-122900 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=96868048&loc=d3e5283-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.9-06) -URI http://asc.fasb.org/extlink&oid=6882215&loc=d3e537971-122884 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04(c)(Schedule I)) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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