Rendering

Component: (Network and Table)
Network
2411405 - Disclosure - Employee Benefit Plans (Net Periodic Benefit Cost (Benefit)) (Detail)
(http://www.frostbank.com/role/EmployeeBenefitPlansNetPeriodicBenefitCostBenefitDetail)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000039263 (http://www.sec.gov/CIK)
Compensation and Retirement Disclosure [Abstract]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
2014-01-01 - 2014-12-31
Compensation and Retirement Disclosure [Abstract]
 
 
 
Expected return on plan assets, net of expenses
(11,558,000) 
(11,932,000) 
(12,514,000) 
Interest cost on projected benefit obligation
6,958,000  
8,210,000  
8,002,000  
Net amortization and deferral
6,247,000  
6,995,000  
2,687,000  
SERP settlement costs
1,027,000  
0  
0  
Net periodic expense (benefit)
2,674,000  
 
3,273,000  
 
(1,825,000)