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Operating Segments - Summary of Operating Results by Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Segment Reporting Information [Line Items]        
Revenues from (expenses to) external customers $ 270,359 $ 258,503 $ 796,068 $ 745,444
Net income 75,850 77,381 221,090 205,273
Operating Segments [Member] | Banking [Member]        
Segment Reporting Information [Line Items]        
Revenues from (expenses to) external customers 239,145 225,829 701,080 648,638
Net income 71,402 71,329 208,141 191,491
Operating Segments [Member] | Frost Wealth Advisors [Member]        
Segment Reporting Information [Line Items]        
Revenues from (expenses to) external customers 31,727 32,662 96,867 96,069
Net income 4,782 5,873 15,418 16,345
Operating Segments [Member] | Non-Banks [Member]        
Segment Reporting Information [Line Items]        
Revenues from (expenses to) external customers (513) 12 (1,879) 737
Net income $ (334) $ 179 $ (2,469) $ (2,563)