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Allowance for Loan Losses (Tables)
 9 Months Ended
Sep. 30, 2016
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:
 
September 30, 2016
(dollars in thousands)
Current
30-59 Days
Past Due
60-89 Days
Past Due
Nonaccrual
Total Past
Due
Total Loans
Commercial real estate
$
2,413,004

$
3,286

$
3,323

$
7,551

$
14,160

$
2,427,164

Commercial and industrial
1,327,898

3,536

973

11,890

16,399

1,344,297

Commercial construction
394,812

456

203

6,653

7,312

402,124

Residential mortgage
679,237

585

1,352

11,400

13,337

692,574

Home equity
478,389

2,321

270

2,955

5,546

483,935

Installment and other consumer
61,954

205

85

44

334

62,288

Consumer construction
5,852

—

—

—

—

5,852

Loans held for sale
11,694

—

—

—

—

11,694

Total
$
5,372,840

$
10,389

$
6,206

$
40,493

$
57,088

$
5,429,928


 
December 31, 2015
(dollars in thousands)
Current
30-59 Days
Past Due
60-89 Days
Past Due
Nonaccrual
Total Past
Due
Total Loans
Commercial real estate
$
2,145,655

$
11,602

$
627

$
8,719

$
20,948

$
2,166,603

Commercial and industrial
1,244,802

2,453

296

9,279

12,028

1,256,830

Commercial construction
401,084

3,517

90

8,753

12,360

413,444

Residential mortgage
631,085

1,728

930

5,629

8,287

639,372

Home equity
465,055

2,365

523

2,902

5,790

470,845

Installment and other consumer
73,486

242

111

100

453

73,939

Consumer construction
6,579

—

—

—

—

6,579

Loans held for sale
35,179

94

48

—

142

35,321

Total
$
5,002,925

$
22,001

$
2,625

$
35,382

$
60,008

$
5,062,933
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:
 
September 30, 2016
(dollars in thousands)
Commercial
Real Estate
% of
Total
 
Commercial
and Industrial
% of
Total
 
Commercial
Construction
% of
Total
 
Total
% of
Total
Pass
$
2,346,848

96.7
%
 
$
1,253,411

93.2
%
 
$
375,006

93.2
%
 
$
3,975,265

95.2
%
Special mention
30,050

1.2
%
 
37,079

2.8
%
 
14,335

3.6
%
 
81,464

2.0
%
Substandard
50,266

2.1
%
 
53,807

4.0
%
 
12,783

3.2
%
 
116,856

2.8
%
Total
$
2,427,164

100.0
%
 
$
1,344,297

100.0
%
 
$
402,124

100.0
%
 
$
4,173,585

100.0
%
 
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2015
(dollars in thousands)
Commercial
Real Estate
% of
Total
 
Commercial
and Industrial
% of
Total
 
Commercial
Construction
% of
Total
 
Total
% of
Total
Pass
$
2,094,851

96.7
%
 
$
1,182,685

94.1
%
 
$
375,808

90.9
%
 
$
3,653,344

95.2
%
Special mention
19,938

0.9
%
 
43,896

3.5
%
 
19,846

4.8
%
 
83,680

2.2
%
Substandard
51,814

2.4
%
 
30,249

2.4
%
 
17,790

4.3
%
 
99,853

2.6
%
Total
$
2,166,603

100.0
%
 
$
1,256,830

100.0
%
 
$
413,444

100.0
%
 
$
3,836,877

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:
 
September 30, 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
$
681,174

98.4
%
$
480,980

99.4
%
$
62,244

99.9
%
$
5,852

100.0
%
$
1,230,250

98.8
%
Nonperforming
11,400

1.6
%
2,955

0.6
%
44

0.1
%
—

—
%
14,399

1.2
%
Total
$
692,574

100.0
%
$
483,935

100.0
%
$
62,288

100.0
%
$
5,852

100.0
%
$
1,244,649

100.0
%
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2015
(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
$
633,743

99.1
%
$
467,943

99.4
%
$
73,839

99.8
%
$
6,579

100.0
%
$
1,182,104

99.3
%
Nonperforming
5,629

0.9
%
2,902

0.6
%
100

0.2
%
—

—
%
8,631

0.7
%
Total
$
639,372

100.0
%
$
470,845

100.0
%
$
73,939

100.0
%
$
6,579

100.0
%
$
1,190,735

100.0
%
Investments in Loans Considered to be Impaired and Related Information on Impaired Loans
 
For the Nine Months Ended
 
September 30, 2016
September 30, 2015
(dollars in thousands)
Average
Recorded
Investment
Interest
Income
Recognized
Average
Recorded
Investment
Interest
Income
Recognized
Without a related allowance recorded:
 
 
 
 
Commercial real estate
$
7,551

$
106

$
14,994

$
731

Commercial and industrial
7,447

156

9,742

131

Commercial construction
8,498

143

8,920

200

Consumer real estate
11,831

400

6,856

279

Other consumer
38

1

119

1

Total without a Related Allowance Recorded
35,365

806

40,631

1,342

With a related allowance recorded:
 
 
 
 
Commercial real estate
—

—

—

—

Commercial and industrial
2,492

100

1,980

42

Commercial construction
—

—

—

—

Consumer real estate
29

2

121

5

Other consumer
2

—

2

—

Total with a Related Allowance Recorded
2,523

102

2,103

47

Total:
 
 
 
 
Commercial real estate
7,551

106

14,994

731

Commercial and industrial
9,939

256

11,722

173

Commercial construction
8,498

143

8,920

200

Consumer real estate
11,860

402

6,977

284

Other consumer
40

1

121

1

Total
$
37,888

$
908

$
42,734

$
1,389

The following tables summarize investments in loans considered to be impaired and related information on those impaired loans as of the dates presented:
 
September 30, 2016
 
December 31, 2015
(dollars in thousands)
Recorded
Investment
Unpaid
Principal
Balance
Related
Allowance
 
Recorded
Investment
Unpaid
Principal
Balance
Related
Allowance
Without a related allowance recorded:
 
 
 
 
 
 
 
Commercial real estate
$
7,589

$
7,818

$
—

 
$
12,661

$
13,157

$
—

Commercial and industrial
8,261

9,730

—

 
14,417

15,220

—

Commercial construction
7,987

11,547

—

 
10,998

14,200

—

Consumer real estate
11,731

12,434

—

 
6,845

7,521

—

Other consumer
29

36

—

 
111

188

—

Total without a Related Allowance Recorded
35,597

41,565

—

 
45,032

50,286

—

With a related allowance recorded:
 
 
 
 
 
 
 
Commercial real estate
—

—

—

 
—

—

—

Commercial and industrial
2,433

2,433

2,206

 
—

—

—

Commercial construction
—

—

—

 
500

1,350

3

Consumer real estate
27

27

27

 
116

116

32

Other consumer
2

2

2

 
2

2

2

Total with a Related Allowance Recorded
2,462

2,462

2,235

 
618

1,468

37

Total:
 
 
 
 
 
 
 
Commercial real estate
7,589

7,818

—

 
12,661

13,157

—

Commercial and industrial
10,694

12,163

2,206

 
14,417

15,220

—

Commercial construction
7,987

11,547

—

 
11,498

15,550

3

Consumer real estate
11,758

12,461

27

 
6,961

7,637

32

Other consumer
31

38

2

 
113

190

2

Total
$
38,059

$
44,027

$
2,235

 
$
45,650

$
51,754

$
37

The following tables summarize investments in loans considered to be impaired and related information on those impaired loans for the periods presented:
 
For the Three Months Ended
 
September 30, 2016
September 30, 2015
(dollars in thousands)
Average
Recorded
Investment
Interest
Income
Recognized
Average
Recorded
Investment
Interest
Income
Recognized
Without a related allowance recorded:
 
 
 
 
Commercial real estate
$
7,582

$
38

$
14,101

$
352

Commercial and industrial
7,326

52

8,993

44

Commercial construction
8,039

49

11,034

67

Consumer real estate
11,686

159

6,829

92

Other consumer
32

—

183

—

Total without a Related Allowance Recorded
34,665

298

41,140

555

With a related allowance recorded:
 
 
 
 
Commercial real estate
—

—

—

—

Commercial and industrial
2,437

37

1,977

7

Commercial construction
—

—

—

—

Consumer real estate
28

—

119

2

Other consumer
2

—

2

—

Total with a Related Allowance Recorded
2,467

37

2,098

9

Total:
 
 
 
 
Commercial real estate
7,582

38

14,101

352

Commercial and industrial
9,763

89

10,970

51

Commercial construction
8,039

49

11,034

67

Consumer real estate
11,714

159

6,948

94

Other consumer
34

—

185

—

Total
$
37,132

$
335

$
43,238

$
564
Summary of Allowance for Loan Losses
The following tables detail activity in the ALL for the periods presented:
 
Three Months Ended September 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
$
15,978

 
$
14,771

 
$
11,701

 
$
8,418

 
$
1,345

 
$
52,213

Charge-offs
(93
)
 
(414
)
 
(163
)
 
(369
)
 
(461
)
 
(1,500
)
Recoveries
264

 
169

 
17

 
44

 
70

 
564

Net (Charge-offs)/ Recoveries
171

 
(245
)
 
(146
)
 
(325
)
 
(391
)
 
(936
)
Provision for loan losses
4,244

 
(2,232
)
 
1,356

 
(1,760
)
 
908

 
2,516

Balance at End of Period
$
20,393

 
$
12,294

 
$
12,911

 
$
6,333

 
$
1,862

 
$
53,793

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Three Months Ended September 30, 2015
(dollars in thousands)
Commercial
Real Estate

 
Commercial and
Industrial

 
Commercial
Construction

 
Consumer
Real Estate

 
Other
Consumer

 
Total
Loans

Balance at beginning of period
$
19,018

 
$
13,308

 
$
7,671

 
$
7,027

 
$
1,790

 
$
48,814

Charge-offs
(2,361
)
 
(1,121
)
 
(1,247
)
 
(445
)
 
(467
)
 
(5,641
)
Recoveries
2,896

 
272

 
129

 
132

 
99

 
3,528

Net (Charge-offs)/ Recoveries
535

 
(849
)
 
(1,118
)
 
(313
)
 
(368
)
 
(2,113
)
Provision for loan losses
(2,575
)
 
12

 
4,983

 
302

 
484

 
3,206

Balance at End of Period
$
16,978

 
$
12,471

 
$
11,536

 
$
7,016

 
$
1,906

 
$
49,907

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Nine Months Ended September 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
(1,808
)
 
(3,244
)
 
(1,108
)
 
(891
)
 
(1,572
)
 
(8,623
)
Recoveries
662

 
589

 
20

 
342

 
277

 
1,890

Net (Charge-offs)/Recoveries
(1,146
)
 
(2,655
)
 
(1,088
)
 
(549
)
 
(1,295
)
 
(6,733
)
Provision for loan losses
6,496

 
4,096

 
1,374

 
(1,518
)
 
1,931

 
12,379

Balance at End of Period
$
20,393

 
$
12,294

 
$
12,911

 
$
6,333

 
$
1,862

 
$
53,793

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Nine Months Ended September 30, 2015
(dollars in thousands)
Commercial
Real Estate
 
Commercial and
Industrial
 
Commercial
Construction
 
Consumer
Real Estate
 
Other
Consumer
 
Total
Loans
Balance at beginning of period
$
20,164

 
$
13,668

 
$
6,093

 
$
6,333

 
$
1,653

 
$
47,911

Charge-offs
(2,738
)
 
(2,819
)
 
(1,247
)
 
(997
)
 
(1,046
)
 
(8,847
)
Recoveries
3,072

 
475

 
132

 
379

 
312

 
4,370

Net (Charge-offs)/Recoveries
334

 
(2,344
)
 
(1,115
)
 
(618
)
 
(734
)
 
(4,477
)
Provision for loan losses
(3,520
)
 
1,147

 
6,558

 
1,301

 
987

 
6,473

Balance at End of Period
$
16,978

 
$
12,471

 
$
11,536

 
$
7,016

 
$
1,906

 
$
49,907
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:
 
September 30, 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
$
—

$
20,393

$
20,393

 
$
7,589

$
2,419,575

$
2,427,164

Commercial and industrial
2,206

10,088

12,294

 
10,694

1,333,603

1,344,297

Commercial construction
—

12,911

12,911

 
7,987

394,137

402,124

Consumer real estate
27

6,306

6,333

 
11,758

1,170,603

1,182,361

Other consumer
2

1,860

1,862

 
31

62,257

62,288

Total
$
2,235

$
51,558

$
53,793

 
$
38,059

$
5,380,175

$
5,418,234

 
 
December 31, 2015
 
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
$
—

$
15,043

$
15,043

 
$
12,661

$
2,153,942

$
2,166,603

Commercial and industrial
—

10,853

10,853

 
14,417

1,242,413

1,256,830

Commercial construction
3

12,622

12,625

 
11,498

401,946

413,444

Consumer real estate
32

8,368

8,400

 
6,961

1,109,835

1,116,796

Other consumer
2

1,224

1,226

 
113

73,826

73,939

Total
$
37

$
48,110

$
48,147

 
$
45,650

$
4,981,962

$
5,027,612