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Condensed Financial Statements of Parent Company (Tables) | 12 Months Ended
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Dec. 31, 2017
Condensed Financial Information of Parent Company Only Disclosure [Abstract] |
Schedule of Condensed Balance Sheets | 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 |
Schedule of Condensed Statements of Income | 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 |
Schedule of Condensed Statements of Cash Flows | 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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