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Operating Segments - Summary of Operating Results by Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Segment Reporting Information [Line Items]    
Revenues from (expenses to) external customers $ 237,825 $ 230,593
Net income 61,188 55,188
Operating Segments [Member] | Banking [Member]
    
Segment Reporting Information [Line Items]    
Revenues from (expenses to) external customers 206,214 204,260
Net income 56,056 53,553
Operating Segments [Member] | Frost Wealth Advisors [Member]
    
Segment Reporting Information [Line Items]    
Revenues from (expenses to) external customers 31,094 27,223
Net income 5,084 3,238
Operating Segments [Member] | Non-Banks [Member]
    
Segment Reporting Information [Line Items]    
Revenues from (expenses to) external customers 517 (890)
Net income $ 48 $ (1,603)