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Allowance for Loan Losses (Tables)
 3 Months Ended
Mar. 31, 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:
 
March 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
$
2,238,144

$
6,669

$
174

$
15,244

$
22,087

$
2,260,231

Commercial and industrial
1,306,834

12,509

567

14,209

27,285

1,334,119

Commercial construction
364,675

1,086

3,539

9,993

14,618

379,293

Residential mortgage
636,328

1,749

3,455

9,012

14,216

650,544

Home equity
460,203

3,754

447

3,267

7,468

467,671

Installment and other consumer
75,741

297

42

109

448

76,189

Consumer construction
8,701

—

—

—

—

8,701

Loans held for sale
11,739

—

—

—

—

11,739

Totals
$
5,102,365

$
26,064

$
8,224

$
51,834

$
86,122

$
5,188,487


 
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

Totals
$
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:
 
March 31, 2016
(dollars in thousands)
Commercial
Real Estate
% of
Total
 
Commercial
and Industrial
% of
Total
 
Commercial
Construction
% of
Total
 
Total
% of
Total
Pass
$
2,179,599

96.4
%
 
$
1,253,947

94.0
%
 
$
340,469

89.8
%
 
$
3,774,015

95.0
%
Special mention
26,788

1.2
%
 
28,517

2.1
%
 
20,362

5.4
%
 
75,667

1.9
%
Substandard
53,844

2.4
%
 
51,655

3.9
%
 
18,462

4.8
%
 
123,961

3.1
%
Total
$
2,260,231

100
%
 
$
1,334,119

100.0
%
 
$
379,293

100.0
%
 
$
3,973,643

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:
 
March 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
$
641,532

98.6
%
$
464,404

99.3
%
$
76,080

99.9
%
$
8,701

100.0
%
$
1,190,717

99.0
%
Nonperforming
9,012

1.4
%
3,267

0.7
%
109

0.1
%
—

—
%
12,388

1.0
%
Total
$
650,544

100.0
%
$
467,671

100.0
%
$
76,189

100.0
%
$
8,701

100.0
%
$
1,203,105

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
The following tables summarize investments in loans considered to be impaired and related information on those impaired loans for the periods presented:
 
Three Months Ended
 
March 31, 2016
March 31, 2015
(dollars in thousands)
Average
Recorded
Investment
Interest
Income
Recognized
Average
Recorded
Investment
Interest
Income
Recognized
Without a related allowance recorded:
 
 
 
 
Commercial real estate
$
18,605

$
199

$
22,627

$
164

Commercial and industrial
15,513

149

10,847

62

Commercial construction
10,782

64

7,704

53

Consumer real estate
11,102

135

7,073

96

Other consumer
26

—

34

—

Total without a Related Allowance Recorded
56,028

547

48,285

375

With a related allowance recorded:
 
 
 
 
Commercial real estate
—

—

823

8

Commercial and industrial
5,382

32

—

—

Commercial construction
1,117

6

—

—

Consumer real estate
115

2

42

1

Other consumer
2

—

19

—

Total with a Related Allowance Recorded
6,616

40

884

9

Total:
 
 
 
 
Commercial real estate
18,605

199

23,450

172

Commercial and industrial
20,895

181

10,847

62

Commercial construction
11,899

70

7,704

53

Consumer real estate
11,217

137

7,115

97

Other consumer
28

—

53

—

Total
$
62,644

$
587

$
49,169

$
384



The following tables summarize investments in loans considered to be impaired and related information on those impaired loans as of the dates presented:
 
March 31, 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
$
18,505

$
26,493

$
—

 
$
12,661

$
13,157

$
—

Commercial and industrial
13,778

14,750

—

 
14,417

15,220

—

Commercial construction
10,772

13,974

—

 
10,998

14,200

—

Consumer real estate
11,038

11,703

—

 
6,845

7,521

—

Other consumer
27

29

—

 
111

188

—

Total without a Related Allowance Recorded
54,120

66,949

—

 
45,032

50,286

—

With a related allowance recorded:
 
 
 
 
 
 
 
Commercial real estate
—

—

—

 
—

—

—

Commercial and industrial
4,850

5,356

2,027

 
—

—

—

Commercial construction
1,116

1,966

154

 
500

1,350

3

Consumer real estate
114

114

30

 
116

116

32

Other consumer
2

2

2

 
2

2

2

Total with a Related Allowance Recorded
6,082

7,438

2,213

 
618

1,468

37

Total:
 
 
 
 
 
 
 
Commercial real estate
18,505

26,493

—

 
12,661

13,157

—

Commercial and industrial
18,628

20,106

2,027

 
14,417

15,220

—

Commercial construction
11,888

15,940

154

 
11,498

15,550

3

Consumer real estate
11,152

11,817

30

 
6,961

7,637

32

Other consumer
29

31

2

 
113

190

2

Total
$
60,202

$
74,387

$
2,213

 
$
45,650

$
51,754

$
37
Summary of Allowance for Loan Losses
The following tables detail activity in the ALL for the periods presented:
 
Three Months Ended March 31, 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
(54
)
 
(2,694
)
 
—

 
(232
)
 
(648
)
 
(3,628
)
Recoveries
361

 
203

 
2

 
164

 
84

 
814

Net (Charge-offs)/ Recoveries
307

 
(2,491
)
 
2

 
(68
)
 
(564
)
 
(2,814
)
Provision for loan losses
(84
)
 
6,378

 
(1,802
)
 
(71
)
 
593

 
5,014

Balance at End of Period
$
15,266

 
$
14,740

 
$
10,825

 
$
8,261

 
$
1,255

 
$
50,347

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Three Months Ended March 31, 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
(66
)
 
(707
)
 
—

 
(375
)
 
(303
)
 
(1,451
)
Recoveries
103

 
114

 
1

 
136

 
85

 
439

Net (Charge-offs)/ Recoveries
37

 
(593
)
 
1

 
(239
)
 
(218
)
 
(1,012
)
Provision for loan losses
(1,130
)
 
636

 
775

 
629

 
297

 
1,207

Balance at End of Period
$
19,071

 
$
13,711

 
$
6,869

 
$
6,723

 
$
1,732

 
$
48,106
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:
 
March 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(1)

Commercial real estate
$
—

$
15,266

$
15,266

 
$
18,505

$
2,241,726

$
2,260,231

Commercial and industrial
2,027

12,713

14,740

 
18,628

1,315,491

1,334,119

Commercial construction
154

10,671

10,825

 
11,888

367,405

379,293

Consumer real estate
30

8,231

8,261

 
11,152

1,115,764

1,126,916

Other consumer
2

1,253

1,255

 
29

76,160

76,189

Total
$
2,213

$
48,134

$
50,347

 
$
60,202

$
5,116,546

$
5,176,748

(1)Includes acquired loans.
 
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(1)

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

(1)Includes acquired loans.