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Operating Segments (Tables) | 12 Months Ended
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Dec. 31, 2017
Segment Reporting [Abstract] |
Summary of Operating Results by Segment | Financial results by operating segment are detailed below. Certain prior period amounts have been reclassified to conform to the current presentation. Frost Wealth Advisors excludes off balance sheet managed and custody assets with a total fair value of $32.8 billion, $29.3 billion and $30.7 billion at December 31, 2017, 2016 and 2015.
| Banking |  | Frost Wealth Advisors |  | Non-Banks |  | Consolidated
2017 |  |  |  |  |  |  |
Net interest income (expense) | $ | 856,593 |  |  | $ | 17,644 |  |  | $ | (7,815 | ) |  | $ | 866,422 |
Provision for loan losses | 35,460 |  |  | — |  |  | — |  |  | 35,460 |
Non-interest income | 207,810 |  |  | 128,819 |  |  | (159 | ) |  | 336,470 |
Non-interest expense | 644,072 |  |  | 108,931 |  |  | 6,066 |  |  | 759,069 |
Income (loss) before income taxes | 384,871 |  |  | 37,532 |  |  | (14,040 | ) |  | 408,363 |
Income tax expense (benefit) | 37,837 |  |  | 13,137 |  |  | (6,760 | ) |  | 44,214 |
Net income (loss) | 347,034 |  |  | 24,395 |  |  | (7,280 | ) |  | 364,149 |
Preferred stock dividends | — |  |  | — |  |  | 8,063 |  |  | 8,063 |
Net income (loss) available to common shareholders | $ | 347,034 |  |  | $ | 24,395 |  |  | $ | (15,343 | ) |  | $ | 356,086 |
Revenues from (expenses to) external customers | $ | 1,064,403 |  |  | $ | 146,463 |  |  | $ | (7,974 | ) |  | $ | 1,202,892 |
Average assets (in millions) | $ | 30,391 |  |  | $ | 43 |  |  | $ | 16 |  |  | $ | 30,450 |
| Banking |  | Frost Wealth Advisors |  | Non-Banks |  | Consolidated
2016 |  |  |  |  |  |  |
Net interest income (expense) | $ | 769,625 |  |  | $ | 11,335 |  |  | $ | (4,624 | ) |  | $ | 776,336 |
Provision for loan losses | 51,672 |  |  | 1 |  |  | — |  |  | 51,673 |
Non-interest income | 229,791 |  |  | 120,102 |  |  | (185 | ) |  | 349,708 |
Non-interest expense | 624,396 |  |  | 102,062 |  |  | 6,502 |  |  | 732,960 |
Income (loss) before income taxes | 323,348 |  |  | 29,374 |  |  | (11,311 | ) |  | 341,411 |
Income tax expense (benefit) | 33,683 |  |  | 10,281 |  |  | (6,814 | ) |  | 37,150 |
Net income (loss) | 289,665 |  |  | 19,093 |  |  | (4,497 | ) |  | 304,261 |
Preferred stock dividends | — |  |  | — |  |  | 8,063 |  |  | 8,063 |
Net income (loss) available to common shareholders | $ | 289,665 |  |  | $ | 19,093 |  |  | $ | (12,560 | ) |  | $ | 296,198 |
Revenues from (expenses to) external customers | $ | 999,416 |  |  | $ | 131,437 |  |  | $ | (4,809 | ) |  | $ | 1,126,044 |
Average assets (in millions) | $ | 28,795 |  |  | $ | 34 |  |  | $ | 3 |  |  | $ | 28,832 |
2015 |  |  |  |  |  |  |
Net interest income (expense) | $ | 732,671 |  |  | $ | 7,634 |  |  | $ | (3,673 | ) |  | $ | 736,632 |
Provision for loan losses | 51,848 |  |  | (3 | ) |  | — |  |  | 51,845 |
Non-interest income | 205,606 |  |  | 121,489 |  |  | 1,635 |  |  | 328,730 |
Non-interest expense | 589,394 |  |  | 98,405 |  |  | 5,919 |  |  | 693,718 |
Income (loss) before income taxes | 297,035 |  |  | 30,721 |  |  | (7,957 | ) |  | 319,799 |
Income tax expense (benefit) | 34,997 |  |  | 10,753 |  |  | (5,279 | ) |  | 40,471 |
Net income (loss) | 262,038 |  |  | 19,968 |  |  | (2,678 | ) |  | 279,328 |
Preferred stock dividends | — |  |  | — |  |  | 8,063 |  |  | 8,063 |
Net income (loss) available to common shareholders | $ | 262,038 |  |  | $ | 19,968 |  |  | $ | (10,741 | ) |  | $ | 271,265 |
Revenues from (expenses to) external customers | $ | 938,277 |  |  | $ | 129,123 |  |  | $ | (2,038 | ) |  | $ | 1,065,362 |
Average assets (in millions) | $ | 28,023 |  |  | $ | 36 |  |  | $ | 2 |  |  | $ | 28,061 |

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8736-108599 + Details
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