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Condensed Financial Statements of Parent Company (Tables) | 12 Months Ended
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Dec. 31, 2020
Condensed Financial Information Disclosure [Abstract] |
Schedule of Condensed Balance Sheets | Condensed Balance Sheets
| December 31,
| 2020 |  | 2019
Assets: |  |  |
Cash | $ | 381,240 |  |  | $ | 9,116 |
Resell agreements | — |  |  | 258,000 |
Total cash and cash equivalents | 381,240 |  |  | 267,116 |
Investment in subsidiaries | 4,155,619 |  |  | 3,896,962 |
Accrued interest receivable and other assets | 2,164 |  |  | 2,545 |
Total assets | $ | 4,539,023 |  |  | $ | 4,166,623 |
Liabilities: |  |  |
Junior subordinated deferrable interest debentures, net of unamortized issuance costs | $ | 136,357 |  |  | $ | 136,299 |
Subordinated notes, net of unamortized issuance costs | 99,021 |  |  | 98,865 |
Accrued interest payable and other liabilities | 10,629 |  |  | 19,791 |
Total liabilities | 246,007 |  |  | 254,955 |
Shareholders’ Equity | 4,293,016 |  |  | 3,911,668 |
Total liabilities and shareholders’ equity | $ | 4,539,023 |  |  | $ | 4,166,623 |
Schedule of Condensed Statements of Income | Condensed Statements of Income
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
Income: |  |  |  |  |
Dividend income paid by Frost Bank | $ | 298,884 |  |  | $ | 234,531 |  |  | $ | 223,371 |
Dividend income paid by non-banks | 736 |  |  | 1,822 |  |  | 953 |
Interest and other income | 446 |  |  | 2,868 |  |  | 1,828 |
Total income | 300,066 |  |  | 239,221 |  |  | 226,152 |
Expenses: |  |  |  |  |
Interest expense | 8,216 |  |  | 10,363 |  |  | 9,948 |
Salaries and employee benefits | 1,581 |  |  | 1,551 |  |  | 1,973 |
Other | 6,833 |  |  | 7,033 |  |  | 7,016 |
Total expenses | 16,630 |  |  | 18,947 |  |  | 18,937 |
Income before income taxes and equity in undistributed earnings of subsidiaries | 283,436 |  |  | 220,274 |  |  | 207,215 |
Income tax benefit | 5,406 |  |  | 5,135 |  |  | 5,218 |
Equity in undistributed earnings of subsidiaries | 42,309 |  |  | 218,190 |  |  | 242,485 |
Net income | 331,151 |  |  | 443,599 |  |  | 454,918 |
Preferred stock dividends | 2,016 |  |  | 8,063 |  |  | 8,063 |
Redemption of preferred stock | 5,514 |  |  | — |  |  | — |
Net income available to common shareholders | $ | 323,621 |  |  | $ | 435,536 |  |  | $ | 446,855 |
Schedule of Condensed Statements of Cash Flows | Condensed Statements of Cash Flows
| Year Ended December 31, |  |  |  |
| 2020 |  | 2019 |  | 2018 |  |  |  |
Operating Activities: |  |  |  |  |  |  |  |  |
Net income | $ | 331,151 |  |  | $ | 443,599 |  |  | $ | 454,918 |  |  |  |  |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |
Equity in undistributed earnings of subsidiaries | (42,309) |  |  | (218,190) |  |  | (242,485) |  |  |  |  |
Stock-based compensation | 770 |  |  | 780 |  |  | 721 |  |  |  |  |
Net tax benefit from stock-based compensation | 370 |  |  | 240 |  |  | 304 |  |  |  |  |
Net change in other assets and other liabilities | (8,937) |  |  | 22,216 |  |  | (12,709) |  |  |  |  |
Net cash from operating activities | 281,045 |  |  | 248,645 |  |  | 200,749 |  |  |  |  |
Investing Activities: |  |  |  |  |  |  |  |  |
Net cash from investing activities | — |  |  | — |  |  | — |  |  |  |  |
Financing Activities: |  |  |  |  |  |  |  |  |
Redemption of Series A preferred stock | (150,000) |  |  | — |  |  | — |  |  |  |  |
Proceeds from issuance of Series B preferred stock | 145,452 |  |  | — |  |  | — |  |  |  |  |
Proceeds from stock option exercises | 12,557 |  |  | 20,770 |  |  | 31,647 |  |  |  |  |
Proceeds from stock-based compensation activities of subsidiaries | 13,148 |  |  | 15,166 |  |  | 13,222 |  |  |  |  |
Purchase of treasury stock | (15,785) |  |  | (68,793) |  |  | (101,010) |  |  |  |  |
Treasury stock issued to 401(k) stock purchase plan | 10,307 |  |  | — |  |  | — |  |  |  |  |
Cash dividends paid on preferred stock | (2,016) |  |  | (8,063) |  |  | (8,063) |  |  |  |  |
Cash dividends paid on common stock | (180,584) |  |  | (177,006) |  |  | (165,449) |  |  |  |  |
Net cash from financing activities | (166,921) |  |  | (217,926) |  |  | (229,653) |  |  |  |  |
Net change in cash and cash equivalents | 114,124 |  |  | 30,719 |  |  | (28,904) |  |  |  |  |
Cash and cash equivalents at beginning of year | 267,116 |  |  | 236,397 |  |  | 265,301 |  |  |  |  |
Cash and cash equivalents at end of year | $ | 381,240 |  |  | $ | 267,116 |  |  | $ | 236,397 |  |  |  |  |

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