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Segment Information (Tables)
12 Months Ended
Dec. 31, 2014
Segment Information [Abstract]  
Schedule of Segment Information
The following table discloses financial information by reportable segment for the years ended December 31, 2014, 2013 and 2012 ($ in thousands):

  
Years Ended December 31,
 
  
2014
  
2013
  
2012
 
General Banking
      
Net interest income
 
$
404,214
  
$
387,586
  
$
340,130
 
Provision for loan losses, net
  
7,382
   
(7,382
)
  
12,294
 
Noninterest income
  
107,457
   
113,571
   
122,565
 
Noninterest expense
  
355,693
   
367,031
   
302,234
 
Income before income taxes
  
148,596
   
141,508
   
148,167
 
Income taxes
  
33,726
   
32,499
   
38,079
 
General banking net income
 
$
114,870
  
$
109,009
  
$
110,088
 
             
Selected Financial Information
            
Average assets
 
$
11,958,078
  
$
11,463,789
  
$
9,737,230
 
Depreciation and amortization
 
$
35,038
  
$
35,971
  
$
27,886
 
             
Wealth Management
            
Net interest income
 
$
851
  
$
582
  
$
559
 
Noninterest income
  
32,209
   
29,446
   
24,421
 
Noninterest expense
  
26,733
   
24,713
   
20,916
 
Income before income taxes
  
6,327
   
5,315
   
4,064
 
Income taxes
  
2,105
   
1,754
   
1,354
 
Wealth Management net income
 
$
4,222
  
$
3,561
  
$
2,710
 
             
Selected Financial Information
            
Average assets
 
$
1,504
  
$
304
  
$
261
 
Depreciation and amortization
 
$
190
  
$
157
  
$
164
 
             
Insurance
            
Net interest income
 
$
271
  
$
319
  
$
301
 
Noninterest income
  
33,476
   
30,842
   
28,203
 
Noninterest expense
  
26,579
   
23,987
   
21,352
 
Income before income taxes
  
7,168
   
7,174
   
7,152
 
Income taxes
  
2,698
   
2,684
   
2,667
 
Insurance net income
 
$
4,470
  
$
4,490
  
$
4,485
 
             
Selected Financial Information
            
Average assets
 
$
68,448
  
$
66,876
  
$
65,560
 
Depreciation and amortization
 
$
844
  
$
1,025
  
$
1,225
 
             
Consolidated
            
Net interest income
 
$
405,336
  
$
388,487
  
$
340,990
 
Provision for loan losses, net
  
7,382
   
(7,382
)
  
12,294
 
Noninterest income
  
173,142
   
173,859
   
175,189
 
Noninterest expense
  
409,005
   
415,731
   
344,502
 
Income before income taxes
  
162,091
   
153,997
   
159,383
 
Income taxes
  
38,529
   
36,937
   
42,100
 
Consolidated net income
 
$
123,562
  
$
117,060
  
$
117,283
 
             
Selected Financial Information
            
Average assets
 
$
12,028,030
  
$
11,530,969
  
$
9,803,051
 
Depreciation and amortization
 
$
36,072
  
$
37,153
  
$
29,275