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Operating Segments - Summary of Operating Results by Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Segment Reporting Information [Line Items]        
Revenues from (expenses to) external customers $ 261,791 $ 249,116 $ 525,709 $ 486,941
Net income 73,077 66,704 145,240 127,892
Operating Segments [Member] | Banking [Member]        
Segment Reporting Information [Line Items]        
Revenues from (expenses to) external customers 230,066 216,595 461,935 422,809
Net income 69,021 64,105 136,739 120,161
Operating Segments [Member] | Frost Wealth Advisors [Member]        
Segment Reporting Information [Line Items]        
Revenues from (expenses to) external customers 32,498 32,313 65,140 63,407
Net income 5,299 5,389 10,636 10,473
Operating Segments [Member] | Non-Banks [Member]        
Segment Reporting Information [Line Items]        
Revenues from (expenses to) external customers (773) 208 (1,366) 725
Net income $ (1,243) $ (2,790) $ (2,135) $ (2,742)