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Operating Segments (Tables)
 9 Months Ended
Sep. 30, 2013
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, 2013
$
201,374

 
$
28,790

 
$
(820
)
 
$
229,344

September 30, 2012
198,244

 
26,000

 
(1,554
)
 
222,690

Nine months ended:
 
 
 
 
 
 
 
September 30, 2013
$
603,840

 
$
84,272

 
$
(2,485
)
 
$
685,627

September 30, 2012
588,151

 
78,595

 
(3,390
)
 
663,356

 
 
 
 
 
 
 
 
Net income (loss):
 
 
 
 
 
 
 
Three months ended:
 
 
 
 
 
 
 
September 30, 2013
$
57,903

 
$
3,800

 
$
(1,259
)
 
$
60,444

September 30, 2012
56,878

 
3,298

 
(1,507
)
 
58,669

Nine months ended:
 
 
 
 
 
 
 
September 30, 2013
$
168,038

 
$
11,301

 
$
(4,044
)
 
$
175,295

September 30, 2012
171,152

 
10,917

 
(4,305
)
 
177,764