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Operating Segments (Tables)
 6 Months Ended
Jun. 30, 2017
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:
 
 
 
 
 
 
 
June 30, 2017
$
261,250

 
$
36,712

 
$
(2,094
)
 
$
295,868

June 30, 2016
237,444

 
32,225

 
(1,150
)
 
268,519

Six months ended:
 
 
 
 
 
 
 
June 30, 2017
$
520,161

 
$
71,300

 
$
(3,384
)
 
$
588,077

June 30, 2016
492,717

 
63,948

 
(2,279
)
 
554,386

Net income (loss):
 
 
 
 
 
 
 
Three months ended:
 
 
 
 
 
 
 
June 30, 2017
$
81,529

 
$
6,279

 
$
(2,255
)
 
$
85,553

June 30, 2016
68,223

 
4,860

 
(1,576
)
 
71,507

Six months ended:
 
 
 
 
 
 
 
June 30, 2017
$
162,398

 
$
11,573

 
$
(3,477
)
 
$
170,494

June 30, 2016
134,190

 
9,012

 
(2,879
)
 
140,323