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Allowance for Loan Losses (Tables)
 3 Months Ended
Mar. 31, 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:
 
March 31, 2017
(dollars in thousands)
Current
 
30-59 Days
Past Due
 
60-89 Days
Past Due
 
Nonaccrual
 
Total Past
Due
 
Total Loans
Commercial real estate
$
2,605,369

 
$
664

 
$
74

 
$
8,617

 
$
9,355

 
$
2,614,724

Commercial and industrial
1,397,625

 
2,245

 
548

 
21,879

 
24,672

 
1,422,297

Commercial construction
451,001

 
452

 
—

 
3,758

 
4,210

 
455,211

Residential mortgage
690,524

 
1,584

 
284

 
8,218

 
10,086

 
700,610

Home equity
474,824

 
1,007

 
87

 
3,484

 
4,578

 
479,402

Installment and other consumer
70,006

 
122

 
55

 
36

 
213

 
70,219

Consumer construction
4,363

 
—

 
—

 
—

 
—

 
4,363

Loans held for sale
14,355

 
—

 
—

 
—

 
—

 
14,355

Total
$
5,708,067

 
$
6,074

 
$
1,048

 
$
45,992

 
$
53,114

 
$
5,761,181


 
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:
 
March 31, 2017
(dollars in thousands)
Commercial
Real Estate
% of
Total
 
Commercial
and Industrial
% of
Total
 
Commercial
Construction
% of
Total
 
Total
% of
Total
Pass
$
2,527,128

96.7
%
 
$
1,320,246

92.8
%
 
$
431,074

94.7
%
 
$
4,278,448

95.2
%
Special mention
55,256

2.1
%
 
49,271

3.5
%
 
14,592

3.2
%
 
119,119

2.7
%
Substandard
32,340

1.2
%
 
52,780

3.7
%
 
9,545

2.1
%
 
94,665

2.1
%
Total
$
2,614,724

100.0
%
 
$
1,422,297

100.0
%
 
$
455,211

100.0
%
 
$
4,492,232

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:
 
March 31, 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
$
692,392

98.8
%
 
$
475,918

99.3
%
 
$
70,183

99.9
%
 
$
4,363

100.0
%
 
$
1,242,856

99.1
%
Nonperforming
8,218

1.2
%
 
3,484

0.7
%
 
36

0.1
%
 
—

—
%
 
11,738

0.9
%
Total
$
700,610

100.0
%
 
$
479,402

100.0
%
 
$
70,219

100.0
%
 
$
4,363

100.0
%
 
$
1,254,594

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:
 
March 31, 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
9,929

 
11,520

 
3,541

 
964

 
2,433

 
771

Commercial construction
—

 
—

 
—

 
—

 
—

 
—

Consumer real estate
25

 
25

 
25

 
26

 
26

 
26

Other consumer
1

 
1

 
1

 
1

 
1

 
1

Total with a Related Allowance Recorded
9,955

 
11,546

 
3,567

 
991

 
2,460

 
798

Without a related allowance recorded:
 
 
 
 
 
 
 
 
 
 
 
Commercial real estate
8,429

 
9,773

 
—

 
16,352

 
17,654

 
—

Commercial and industrial
11,115

 
11,651

 
—

 
5,902

 
7,699

 
—

Commercial construction
5,903

 
9,773

 
—

 
6,613

 
10,306

 
—

Consumer real estate
11,335

 
12,185

 
—

 
12,053

 
12,849

 
—

Other consumer
21

 
23

 
—

 
24

 
31

 
—

Total without a Related Allowance Recorded
36,803

 
43,405

 
—

 
40,944

 
48,539

 
—

Total:
 
 
 
 
 
 
 
 
 
 
 
Commercial real estate
8,429

 
9,773

 
—

 
16,352

 
17,654

 
—

Commercial and industrial
21,044

 
23,171

 
3,541

 
6,866

 
10,132

 
771

Commercial construction
5,903

 
9,773

 
—

 
6,613

 
10,306

 
—

Consumer real estate
11,360

 
12,210

 
25

 
12,079

 
12,875

 
26

Other consumer
22

 
24

 
1

 
25

 
32

 
1

Total
$
46,758

 
$
54,951

 
$
3,567

 
$
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
 
March 31, 2017
 
March 31, 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
10,008

 
72

 
5,382

 
32

Commercial construction
—

 
—

 
1,117

 
6

Consumer real estate
26

 
—

 
115

 
2

Other consumer
1

 
—

 
2

 
—

Total with a Related Allowance Recorded
10,035

 
72

 
6,616

 
40

Without a related allowance recorded:
 
 
 
 
 
 
 
Commercial real estate
8,581

 
33

 
18,605

 
199

Commercial and industrial
11,410

 
43

 
15,513

 
149

Commercial construction
6,239

 
37

 
10,782

 
64

Consumer real estate
11,692

 
129

 
11,102

 
135

Other consumer
22

 
—

 
26

 
—

Total without a Related Allowance Recorded
37,944

 
242

 
56,028

 
547

Total:
 
 
 
 
 
 
 
Commercial real estate
8,581

 
33

 
18,605

 
199

Commercial and industrial
21,418

 
115

 
20,895

 
181

Commercial construction
6,239

 
37

 
11,899

 
70

Consumer real estate
11,718

 
129

 
11,217

 
137

Other consumer
23

 
—

 
28

 
—

Total
$
47,979

 
$
314

 
$
62,644

 
$
587


 
 
 
 
 
Summary of Allowance for Loan Losses
The following tables detail activity in the ALL for the periods presented:
 
Three Months Ended March 31, 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
(390
)
 
(715
)
 
(644
)
 
(759
)
 
(434
)
 
(2,942
)
Recoveries
78

 
187

 
256

 
103

 
176

 
800

Net (Charge-offs)/ Recoveries
(312
)
 
(528
)
 
(388
)
 
(656
)
 
(258
)
 
(2,142
)
Provision for loan losses
906

 
2,962

 
491

 
517

 
307

 
5,183

Balance at End of Period
$
20,570

 
$
13,244

 
$
14,102

 
$
5,956

 
$
1,944

 
$
55,816

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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, 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
$
—

 
$
20,570

 
$
20,570

 
$
8,429

 
$
2,606,295

 
$
2,614,724

Commercial and industrial
3,541

 
9,703

 
13,244

 
21,044

 
1,401,253

 
1,422,297

Commercial construction
—

 
14,102

 
14,102

 
5,903

 
449,308

 
455,211

Consumer real estate
25

 
5,931

 
5,956

 
11,360

 
1,173,015

 
1,184,375

Other consumer
1

 
1,943

 
1,944

 
22

 
70,197

 
70,219

Total
$
3,567

 
$
52,249

 
$
55,816

 
$
46,758

 
$
5,700,068

 
$
5,746,826

 
 
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