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Allowance for Loan Losses (Tables)
 6 Months Ended
Jun. 30, 2017
Receivables [Abstract]  
Age Analysis of Past Due Loans Segregated by Class of Loans
The following tables present the age analysis of past due loans segregated by class of loans as of the dates presented:
 
June 30, 2017
(dollars in thousands)
Current
 
30-59 Days
Past Due
 
60-89 Days
Past Due
 
Nonaccrual
 
Total Past
Due
 
Total Loans
Commercial real estate
$
2,653,680

 
$
2,846

 
$
917

 
$
7,199

 
$
10,962

 
$
2,664,642

Commercial and industrial
1,381,657

 
1,454

 
754

 
17,418

 
19,626

 
1,401,283

Commercial construction
424,254

 
187

 
—

 
2,313

 
2,500

 
426,754

Residential mortgage
694,800

 
3,506

 
781

 
7,056

 
11,343

 
706,143

Home equity
479,190

 
2,620

 
508

 
2,642

 
5,770

 
484,960

Installment and other consumer
69,756

 
211

 
60

 
41

 
312

 
70,068

Consumer construction
3,969

 
—

 
—

 
—

 
—

 
3,969

Loans held for sale
23,120

 
—

 
—

 
—

 
—

 
23,120

Total
$
5,730,426

 
$
10,824

 
$
3,020

 
$
36,669

 
$
50,513

 
$
5,780,939


 
December 31, 2016
(dollars in thousands)
Current
 
30-59 Days
Past Due
 
60-89 Days
Past Due
 
Nonaccrual
 
Total Past
Due
 
Total Loans
Commercial real estate
$
2,479,513

 
$
2,032

 
$
759

 
$
16,172

 
$
18,963

 
$
2,498,476

Commercial and industrial
1,391,475

 
1,061

 
428

 
8,071

 
9,560

 
1,401,035

Commercial construction
450,410

 
547

 
—

 
4,927

 
5,474

 
455,884

Residential mortgage
689,635

 
1,312

 
1,117

 
9,918

 
12,347

 
701,982

Home equity
476,866

 
1,470

 
509

 
3,439

 
5,418

 
482,284

Installment and other consumer
65,525

 
176

 
43

 
108

 
327

 
65,852

Consumer construction
5,906

 
—

 
—

 
—

 
—

 
5,906

Loans held for sale
3,793

 
—

 
—

 
—

 
—

 
3,793

Total
$
5,563,123

 
$
6,598

 
$
2,856

 
$
42,635

 
$
52,089

 
$
5,615,212
Recorded Investment in Commercial Loan Classes by Internally Assigned Risk Ratings
The following tables present the recorded investment in commercial loan classes by internally assigned risk ratings as of the dates presented:
 
June 30, 2017
(dollars in thousands)
Commercial
Real Estate
% of
Total
 
Commercial
and Industrial
% of
Total
 
Commercial
Construction
% of
Total
 
Total
% of
Total
Pass
$
2,574,835

96.6
%
 
$
1,290,204

92.1
%
 
$
402,199

94.2
%
 
$
4,267,238

95.0
%
Special mention
57,197

2.2
%
 
62,033

4.4
%
 
16,468

3.9
%
 
135,698

3.0
%
Substandard
32,610

1.2
%
 
49,046

3.5
%
 
8,087

1.9
%
 
89,743

2.0
%
Total
$
2,664,642

100.0
%
 
$
1,401,283

100.0
%
 
$
426,754

100.0
%
 
$
4,492,679

100.0
%
 
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2016
(dollars in thousands)
Commercial
Real Estate
% of
Total
 
Commercial
and Industrial
% of
Total
 
Commercial
Construction
% of
Total
 
Total
% of
Total
Pass
$
2,423,742

97.0
%
 
$
1,315,507

93.9
%
 
$
430,472

94.4
%
 
$
4,169,721

95.7
%
Special mention
33,098

1.3
%
 
40,409

2.9
%
 
14,691

3.2
%
 
88,198

2.0
%
Substandard
41,636

1.7
%
 
45,119

3.2
%
 
10,721

2.4
%
 
97,476

2.3
%
Total
$
2,498,476

100.0
%
 
$
1,401,035

100.0
%
 
$
455,884

100.0
%
 
$
4,355,395

100.0
%
Recorded Investment in Consumer Loan Classes by Performing and Nonperforming Status
The following tables present the recorded investment in consumer loan classes by performing and nonperforming status as of the dates presented:
 
June 30, 2017
(dollars in thousands)
Residential
Mortgage
% of
Total
 
Home
Equity
% of
Total
 
Installment
and other
consumer
% of
Total
 
Consumer
Construction
% of
Total
 
Total
% of
Total
Performing
$
699,087

99.0
%
 
$
482,318

99.5
%
 
$
70,027

99.9
%
 
$
3,969

100.0
%
 
$
1,255,401

99.2
%
Nonperforming
7,056

1.0
%
 
2,642

0.5
%
 
41

0.1
%
 
—

—
%
 
9,739

0.8
%
Total
$
706,143

100.0
%
 
$
484,960

100.0
%
 
$
70,068

100.0
%
 
$
3,969

100.0
%
 
$
1,265,140

100.0
%
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2016
(dollars in thousands)
Residential
Mortgage
% of
Total
 
Home
Equity
% of
Total
 
Installment
and other
consumer
% of
Total
 
Consumer
Construction
% of
Total
 
Total
% of
Total
Performing
$
692,064

98.6
%
 
$
478,845

99.3
%
 
$
65,744

99.8
%
 
$
5,906

100.0
%
 
$
1,242,559

98.9
%
Nonperforming
9,918

1.4
%
 
3,439

0.7
%
 
108

0.2
%
 
—

—
%
 
13,465

1.1
%
Total
$
701,982

100.0
%
 
$
482,284

100.0
%
 
$
65,852

100.0
%
 
$
5,906

100.0
%
 
$
1,256,024

100.0
%
Investments in Loans Considered to be Impaired and Related Information on Impaired Loans
The following table summarizes investments in loans considered to be impaired and related information on those impaired loans as of the dates presented:
 
June 30, 2017
 
December 31, 2016
(dollars in thousands)
Recorded
Investment
 
Unpaid
Principal
Balance
 
Related
Allowance
 
Recorded
Investment
 
Unpaid
Principal
Balance
 
Related
Allowance
With a related allowance recorded:
 
 
 
 
 
 
 
 
 
 
 
Commercial real estate
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

Commercial and industrial
2,443

 
2,443

 
340

 
964

 
2,433

 
771

Commercial construction
—

 
—

 
—

 
—

 
—

 
—

Consumer real estate
24

 
24

 
24

 
26

 
26

 
26

Other consumer
25

 
25

 
25

 
1

 
1

 
1

Total with a Related Allowance Recorded
2,492

 
2,492

 
389

 
991

 
2,460

 
798

Without a related allowance recorded:
 
 
 
 
 
 
 
 
 
 
 
Commercial real estate
6,472

 
7,472

 
—

 
16,352

 
17,654

 
—

Commercial and industrial
16,125

 
18,097

 
—

 
5,902

 
7,699

 
—

Commercial construction
4,257

 
6,295

 
—

 
6,613

 
10,306

 
—

Consumer real estate
11,106

 
12,024

 
—

 
12,053

 
12,849

 
—

Other consumer
10

 
13

 
—

 
24

 
31

 
—

Total without a Related Allowance Recorded
37,970

 
43,901

 
—

 
40,944

 
48,539

 
—

Total:
 
 
 
 
 
 
 
 
 
 
 
Commercial real estate
6,472

 
7,472

 
—

 
16,352

 
17,654

 
—

Commercial and industrial
18,568

 
20,540

 
340

 
6,866

 
10,132

 
771

Commercial construction
4,257

 
6,295

 
—

 
6,613

 
10,306

 
—

Consumer real estate
11,130

 
12,048

 
24

 
12,079

 
12,875

 
26

Other consumer
35

 
38

 
25

 
25

 
32

 
1

Total
$
40,462

 
$
46,393

 
$
389

 
$
41,935

 
$
50,999

 
$
798

The following table summarizes average recorded investment in and interest income recognized on loans considered to be impaired for the periods presented:
 
Three Months Ended
 
June 30, 2017
 
June 30, 2016
(dollars in thousands)
Average
Recorded
Investment
 
Interest
Income
Recognized
 
Average
Recorded
Investment
 
Interest
Income
Recognized
With a related allowance recorded:
 
 
 
 
 
 
 
Commercial real estate
$
—

 
$
—

 
$
—

 
$
—

Commercial and industrial
813

 
6

 
4,617

 
31

Commercial construction
—

 
—

 
1,232

 
6

Consumer real estate
24

 
1

 
29

 
1

Other consumer
26

 
—

 
1

 
—

Total with a Related Allowance Recorded
863

 
7

 
5,879

 
38

Without a related allowance recorded:
 
 
 
 
 
 
 
Commercial real estate
6,934

 
35

 
14,619

 
64

Commercial and industrial
17,625

 
95

 
10,959

 
98

Commercial construction
4,262

 
42

 
10,625

 
48

Consumer real estate
11,280

 
125

 
11,028

 
107

Other consumer
11

 
1

 
38

 
—

Total without a Related Allowance Recorded
40,112

 
298

 
47,269

 
317

Total:
 
 
 
 
 
 
 
Commercial real estate
6,934

 
35

 
14,619

 
64

Commercial and industrial
18,438

 
101

 
15,576

 
129

Commercial construction
4,262

 
42

 
11,857

 
54

Consumer real estate
11,304

 
126

 
11,057

 
108

Other consumer
37

 
1

 
39

 
—

Total
$
40,975

 
$
305

 
$
53,148

 
$
355


 
Six Months Ended
 
June 30, 2017
June 30, 2016
(dollars in thousands)
Average
Recorded
Investment
Interest
Income
Recognized
Average
Recorded
Investment
Interest
Income
Recognized
With a related allowance recorded:
 
 
 
 
Commercial real estate
$
—

$
—

$
—

$
—

Commercial and industrial
628

11

4,999

63

Commercial construction
—

—

1,244

12

Consumer real estate
25

1

30

1

Other consumer
27

1

2

—

Total with a Related Allowance Recorded
680

13

6,275

76

Without a related allowance recorded:
 
 
 
 
Commercial real estate
7,028

70

14,798

132

Commercial and industrial
16,382

124

11,253

189

Commercial construction
4,267

79

10,669

108

Consumer real estate
11,514

255

11,089

243

Other consumer
12

—

40

1

Total without a Related Allowance Recorded
39,203

528

47,849

673

Total:
 
 
 
 
Commercial real estate
7,028

70

14,798

132

Commercial and industrial
17,010

135

16,252

252

Commercial construction
4,267

79

11,913

120

Consumer real estate
11,539

256

11,119

244

Other consumer
39

1

42

1

Total
$
39,883

$
541

$
54,124

$
749
Summary of Allowance for Loan Losses
The following tables detail activity in the ALL for the periods presented:
 
Three Months Ended June 30, 2017
(dollars in thousands)
Commercial
Real Estate
 
Commercial and
Industrial
 
Commercial
Construction
 
Consumer
Real Estate
 
Other
Consumer
 
Total
Loans
Balance at beginning of period
$
20,570

 
$
13,244

 
$
14,102

 
$
5,956

 
$
1,944

 
$
55,816

Charge-offs
(1,673
)
 
(2,682
)
 
—

 
(1,097
)
 
(370
)
 
(5,822
)
Recoveries
155

 
69

 
113

 
76

 
75

 
488

Net (Charge-offs)/ Recoveries
(1,518
)
 
(2,613
)
 
113

 
(1,021
)
 
(295
)
 
(5,334
)
Provision for loan losses
5,306

 
(1,375
)
 
(271
)
 
868

 
341

 
4,869

Balance at End of Period
$
24,358

 
$
9,256

 
$
13,944

 
$
5,803

 
$
1,990

 
$
55,351

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Three Months Ended June 30, 2016
(dollars in thousands)
Commercial
Real Estate
 
Commercial and
Industrial
 
Commercial
Construction
 
Consumer
Real Estate
 
Other
Consumer
 
Total
Loans
Balance at beginning of period
$
15,266

 
$
14,740

 
$
10,825

 
$
8,261

 
$
1,255

 
$
50,347

Charge-offs
(1,662
)
 
(136
)
 
(945
)
 
(290
)
 
(463
)
 
(3,496
)
Recoveries
38

 
217

 
2

 
134

 
123

 
514

Net (Charge-offs)/ Recoveries
(1,624
)
 
81

 
(943
)
 
(156
)
 
(340
)
 
(2,982
)
Provision for loan losses
2,336

 
(50
)
 
1,819

 
313

 
430

 
4,848

Balance at End of Period
$
15,978

 
$
14,771

 
$
11,701

 
$
8,418

 
$
1,345

 
$
52,213

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Six Months Ended June 30, 2017
(dollars in thousands)
Commercial
Real Estate
 
Commercial and
Industrial
 
Commercial
Construction
 
Consumer
Real Estate
 
Other
Consumer
 
Total
Loans
Balance at beginning of period
$
19,976

 
$
10,810

 
$
13,999

 
$
6,095

 
$
1,895

 
$
52,775

Charge-offs
(2,063
)
 
(3,396
)
 
(644
)
 
(1,856
)
 
(804
)
 
(8,763
)
Recoveries
233

 
255

 
369

 
179

 
251

 
1,287

Net (Charge-offs)/Recoveries
(1,830
)
 
(3,141
)
 
(275
)
 
(1,677
)
 
(553
)
 
(7,476
)
Provision for loan losses
6,212

 
1,587

 
220

 
1,385

 
648

 
10,052

Balance at End of Period
$
24,358

 
$
9,256

 
$
13,944

 
$
5,803

 
$
1,990

 
$
55,351

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Six Months Ended June 30, 2016
(dollars in thousands)
Commercial
Real Estate
 
Commercial and
Industrial
 
Commercial
Construction
 
Consumer
Real Estate
 
Other
Consumer
 
Total
Loans
Balance at beginning of period
$
15,043

 
$
10,853

 
$
12,625

 
$
8,400

 
$
1,226

 
$
48,147

Charge-offs
(1,715
)
 
(2,830
)
 
(945
)
 
(522
)
 
(1,111
)
 
(7,123
)
Recoveries
398

 
420

 
3

 
298

 
207

 
1,326

Net (Charge-offs)/Recoveries
(1,317
)
 
(2,410
)
 
(942
)
 
(224
)
 
(904
)
 
(5,797
)
Provision for loan losses
2,252

 
6,328

 
18

 
242

 
1,023

 
9,863

Balance at End of Period
$
15,978

 
$
14,771

 
$
11,701

 
$
8,418

 
$
1,345

 
$
52,213
Summary of Allowance for Loan Losses and Recorded Investments
The following tables present the ALL and recorded investments in loans by category as of the periods presented:
 
June 30, 2017
 
Allowance for Loan Losses
 
Portfolio Loans
(dollars in thousands)
Individually
Evaluated for
Impairment

 
Collectively
Evaluated for
Impairment

 
Total

 
Individually
Evaluated for
Impairment

 
Collectively
Evaluated for
Impairment

 
Total

Commercial real estate
$
—

 
$
24,358

 
$
24,358

 
$
6,472

 
$
2,658,170

 
$
2,664,642

Commercial and industrial
340

 
8,916

 
9,256

 
18,568

 
1,382,715

 
1,401,283

Commercial construction
—

 
13,944

 
13,944

 
4,257

 
422,497

 
426,754

Consumer real estate
24

 
5,779

 
5,803

 
11,130

 
1,183,942

 
1,195,072

Other consumer
25

 
1,965

 
1,990

 
35

 
70,033

 
70,068

Total
$
389

 
$
54,962

 
$
55,351

 
$
40,462

 
$
5,717,357

 
$
5,757,819

 
 
December 31, 2016
 
Allowance for Loan Losses
 
Portfolio Loans
(dollars in thousands)
Individually
Evaluated for
Impairment

 
Collectively
Evaluated for
Impairment

 
Total

 
Individually
Evaluated for
Impairment

 
Collectively
Evaluated for
Impairment

 
Total

Commercial real estate
$
—

 
$
19,976

 
$
19,976

 
$
16,352

 
$
2,482,124

 
$
2,498,476

Commercial and industrial
771

 
10,039

 
10,810

 
6,866

 
1,394,169

 
1,401,035

Commercial construction
—

 
13,999

 
13,999

 
6,613

 
449,271

 
455,884

Consumer real estate
26

 
6,069

 
6,095

 
12,079

 
1,178,093

 
1,190,172

Other consumer
1

 
1,894

 
1,895

 
25

 
65,827

 
65,852

Total
$
798

 
$
51,977

 
$
52,775

 
$
41,935

 
$
5,569,484

 
$
5,611,419