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Operating Segments (Tables)
 9 Months Ended
Sep. 30, 2015
Segment Reporting [Abstract]  
Summary of Operating Results by Segment
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, 2015
$
239,145

 
$
31,727

 
$
(513
)
 
$
270,359

September 30, 2014
225,829

 
32,662

 
12

 
258,503

Nine months ended:
 
 
 
 
 
 
 
September 30, 2015
$
701,080

 
$
96,867

 
$
(1,879
)
 
$
796,068

September 30, 2014
648,638

 
96,069

 
737

 
745,444

Net income (loss):
 
 
 
 
 
 
 
Three months ended:
 
 
 
 
 
 
 
September 30, 2015
$
71,402

 
$
4,782

 
$
(334
)
 
$
75,850

September 30, 2014
71,329

 
5,873

 
179

 
77,381

Nine months ended:
 
 
 
 
 
 
 
September 30, 2015
$
208,141

 
$
15,418

 
$
(2,469
)
 
$
221,090

September 30, 2014
191,491

 
16,345

 
(2,563
)
 
205,273