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Operating Segments
 9 Months Ended
Sep. 30, 2016
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 2015 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, 2016
$
244,343

 
$
33,536

 
$
(1,258
)
 
$
276,621

September 30, 2015
239,145

 
31,727

 
(513
)
 
270,359

Nine months ended:
 
 
 
 
 
 
 
September 30, 2016
$
737,060

 
$
97,484

 
$
(3,537
)
 
$
831,007

September 30, 2015
701,080

 
96,867

 
(1,879
)
 
796,068

Net income (loss):
 
 
 
 
 
 
 
Three months ended:
 
 
 
 
 
 
 
September 30, 2016
$
76,347

 
$
4,797

 
$
(925
)
 
$
80,219

September 30, 2015
71,402

 
4,782

 
(334
)
 
75,850

Nine months ended:
 
 
 
 
 
 
 
September 30, 2016
$
210,454

 
$
13,809

 
$
(3,721
)
 
$
220,542

September 30, 2015
208,141

 
15,418

 
(2,469
)
 
221,090