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Operating Segments - Summary of Operating Results by Segment (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Segment Reporting Information [Line Items] |  |  |  |
Revenues from (expenses to) external customers | $ 225,690 | $ 218,980 | $ 456,283 | $ 440,666
Net income (loss) | 56,975 | 58,062 | 112,163 | 119,095
Operating Segments [Member] | Banking [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from (expenses to) external customers | 198,206 | 193,634 | 402,466 | 389,907
Net income (loss) | 56,582 | 55,984 | 110,135 | 114,274
Operating Segments [Member] | Frost Wealth Advisors [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from (expenses to) external customers | 28,259 | 26,598 | 55,482 | 52,595
Net income (loss) | 4,263 | 4,228 | 7,501 | 7,619
Operating Segments [Member] | Non-Banks [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from (expenses to) external customers | (775) | (1,252) | (1,665) | (1,836)
Net income (loss) | $ (1,182) | $ (2,150) | $ (2,785) | $ (2,798)

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- Definition Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1377-109256 + Details
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