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Operating Segments
 9 Months Ended
Sep. 30, 2017
Segment Reporting [Abstract]  
Operating Segments
Operating Segments
We are managed under a matrix organizational structure whereby our two primary operating segments, Banking and Frost Wealth Advisors, overlap a regional reporting structure. See our 2016 Form 10-K for additional information regarding our operating segments. Summarized operating results by segment were as follows:
 
Banking
 
Frost  Wealth
Advisors
 
Non-Banks
 
Consolidated
Revenues from (expenses to) external customers:
 
 
 
 
 
 
 
Three months ended:
 
 
 
 
 
 
 
September 30, 2017
$
266,582

 
$
36,529

 
$
(2,285
)
 
$
300,826

September 30, 2016
244,343

 
33,536

 
(1,258
)
 
276,621

Nine months ended:
 
 
 
 
 
 
 
September 30, 2017
$
786,743

 
$
107,829

 
$
(5,669
)
 
$
888,903

September 30, 2016
737,060

 
97,484

 
(3,537
)
 
831,007

Net income (loss):
 
 
 
 
 
 
 
Three months ended:
 
 
 
 
 
 
 
September 30, 2017
$
88,368

 
$
6,417

 
$
(1,654
)
 
$
93,131

September 30, 2016
76,347

 
4,797

 
(925
)
 
80,219

Nine months ended:
 
 
 
 
 
 
 
September 30, 2017
$
250,766

 
$
17,990

 
$
(5,131
)
 
$
263,625

September 30, 2016
210,454

 
13,809

 
(3,721
)
 
220,542