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Business Segments (Tables)
 12 Months Ended
Dec. 31, 2017
Segment Reporting [Abstract]  
Selected business segment financial information
Selected business segment financial information as of and for the years ended December 31, 2017, 2016, and 2015 were as follows:
(dollars in thousands)
Retail
Banking

 
Commercial
Banking

 
Investment Services and Private Banking

 
Treasury
and Other

 
Consolidated
Total

Year Ended December 31, 2017
 
 
 
 
 
 
 
 
 
Net Interest Income
$
264,041

 
$
171,038

 
$
29,693

 
$
(7,534
)
 
$
457,238

Provision for Credit Losses
14,008

 
(160
)
 
(21
)
 
3,073

 
16,900

Net Interest Income After Provision for Credit Losses
250,033

 
171,198

 
29,714

 
(10,607
)
 
440,338

Noninterest Income
85,042

 
21,670

 
57,105

 
21,600

 
185,417

Noninterest Expense
(209,807
)
 
(74,209
)
 
(61,674
)
 
(12,001
)
 
(357,691
)
Income Before Provision for Income Taxes
125,268

 
118,659

 
25,145

 
(1,008
)
 
268,064

Provision for Income Taxes
(44,545
)
 
(41,797
)
 
(9,303
)
 
12,253

 
(83,392
)
Net Income
$
80,723

 
$
76,862

 
$
15,842

 
$
11,245

 
$
184,672

Total Assets as of December 31, 2017
$
5,936,568

 
$
3,742,991

 
$
336,455

 
$
7,073,038

 
$
17,089,052

 
 
 
 
 
 
 
 
 
 
Year Ended December 31, 2016
 
 
 
 
 
 
 
 
 
Net Interest Income
$
242,967

 
$
156,080

 
$
24,714

 
$
(6,182
)
 
$
417,579

Provision for Credit Losses
10,700

 
(7,322
)
 
(23
)
 
1,395

 
4,750

Net Interest Income After Provision for Credit Losses
232,267

 
163,402

 
24,737

 
(7,577
)
 
412,829

Noninterest Income
91,824

 
26,967

 
57,396

 
21,156

 
197,343

Noninterest Expense
(208,389
)
 
(70,405
)
 
(59,782
)
 
(12,002
)
 
(350,578
)
Income Before Provision for Income Taxes
115,702

 
119,964

 
22,351

 
1,577

 
259,594

Provision for Income Taxes
(41,067
)
 
(42,667
)
 
(8,270
)
 
13,871

 
(78,133
)
Net Income
$
74,635

 
$
77,297

 
$
14,081

 
$
15,448

 
$
181,461

Total Assets as of December 31, 2016
$
5,342,078

 
$
3,565,912

 
$
280,410

 
$
7,303,967

 
$
16,492,367

 
 
 
 
 
 
 
 
 
 
Year Ended December 31, 2015
 
 
 
 
 
 
 
 
 
Net Interest Income
$
202,259

 
$
143,944

 
$
18,494

 
$
29,390

 
$
394,087

Provision for Credit Losses
8,033

 
(1,165
)
 
(43
)
 
(5,825
)
 
1,000

Net Interest Income After Provision for Credit Losses
194,226

 
145,109

 
18,537

 
35,215

 
393,087

Noninterest Income
82,391

 
22,191

 
58,835

 
22,802

 
186,219

Noninterest Expense
(199,572
)
 
(77,500
)
 
(57,852
)
 
(13,180
)
 
(348,104
)
Income Before Provision for Income Taxes
77,045

 
89,800

 
19,520

 
44,837

 
231,202

Provision for Income Taxes
(27,330
)
 
(31,375
)
 
(7,222
)
 
(4,571
)
 
(70,498
)
Net Income
$
49,715

 
$
58,425

 
$
12,298

 
$
40,266

 
$
160,704

Total Assets as of December 31, 2015
$
4,680,888

 
$
3,099,175

 
$
274,469

 
$
7,400,484

 
$
15,455,016