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Operating Segments
 9 Months Ended
Sep. 30, 2018
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 2017 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, 2018
$
295,062

 
$
36,868

 
$
(2,608
)
 
$
329,322

September 30, 2017
266,582

 
36,529

 
(2,285
)
 
300,826

Nine months ended:
 
 
 
 
 
 
 
September 30, 2018
$
874,056

 
$
106,475

 
$
(7,680
)
 
$
972,851

September 30, 2017
786,743

 
107,829

 
(5,669
)
 
888,903

Net income (loss):
 
 
 
 
 
 
 
Three months ended:
 
 
 
 
 
 
 
September 30, 2018
$
114,214

 
$
6,442

 
$
(2,812
)
 
$
117,844

September 30, 2017
88,368

 
6,417

 
(1,654
)
 
93,131

Nine months ended:
 
 
 
 
 
 
 
September 30, 2018
$
327,131

 
$
17,977

 
$
(9,443
)
 
$
335,665

September 30, 2017
250,766

 
17,990

 
(5,131
)
 
263,625