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Allowance for Loan Losses (Tables)
 9 Months Ended
Sep. 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:
 
September 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
$
2,674,171

 
$
530

 
$
421

 
$
6,571

 
$
7,522

 
$
2,681,693

Commercial and industrial
1,438,224

 
499

 
739

 
7,349

 
8,587

 
1,446,811

Commercial construction
428,744

 
75

 
—

 
4,068

 
4,143

 
432,887

Residential mortgage
684,848

 
3,872

 
865

 
7,782

 
12,519

 
697,367

Home equity
482,000

 
1,616

 
515

 
3,675

 
5,806

 
487,806

Installment and other consumer
69,316

 
228

 
52

 
48

 
328

 
69,644

Consumer construction
4,550

 
—

 
—

 
—

 
—

 
4,550

Loans held for sale
47,936

 
—

 
—

 
—

 
—

 
47,936

Total
$
5,829,789

 
$
6,820

 
$
2,592

 
$
29,493

 
$
38,905

 
$
5,868,694


 
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:
 
September 30, 2017
(dollars in thousands)
Commercial
Real Estate
% of
Total
 
Commercial
and Industrial
% of
Total
 
Commercial
Construction
% of
Total
 
Total
% of
Total
Pass
$
2,587,393

96.5
%
 
$
1,354,269

93.6
%
 
$
411,379

95.0
%
 
$
4,353,041

95.4
%
Special mention
55,218

2.1
%
 
53,853

3.7
%
 
11,503

2.7
%
 
120,574

2.6
%
Substandard
39,082

1.4
%
 
38,689

2.7
%
 
10,005

2.3
%
 
87,776

2.0
%
Total
$
2,681,693

100.0
%
 
$
1,446,811

100.0
%
 
$
432,887

100.0
%
 
$
4,561,391

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:
 
September 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
$
689,585

98.9
%
 
$
484,131

99.2
%
 
$
69,596

99.9
%
 
$
4,550

100.0
%
 
$
1,247,862

99.1
%
Nonperforming
7,782

1.1
%
 
3,675

0.8
%
 
48

0.1
%
 
—

—
%
 
11,505

0.9
%
Total
$
697,367

100.0
%
 
$
487,806

100.0
%
 
$
69,644

100.0
%
 
$
4,550

100.0
%
 
$
1,259,367

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
 
Nine Months Ended
 
September 30, 2017
 
September 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
1,218

 
44

 
2,492

 
100

Commercial construction
—

 
—

 
—

 
—

Consumer real estate
24

 
1

 
29

 
2

Other consumer
35

 
1

 
2

 
—

Total with a Related Allowance Recorded
1,277

 
46

 
2,523

 
102

Without a related allowance recorded:
 
 
 
 
 
 
 
Commercial real estate
6,577

 
140

 
7,551

 
106

Commercial and industrial
11,001

 
164

 
7,447

 
156

Commercial construction
7,222

 
194

 
8,498

 
143

Consumer real estate
11,488

 
382

 
11,831

 
400

Other consumer
33

 
1

 
38

 
1

Total without a Related Allowance Recorded
36,321

 
881

 
35,365

 
806

Total:
 
 
 
 
 
 
 
Commercial real estate
6,577

 
140

 
7,551

 
106

Commercial and industrial
12,219

 
208

 
9,939

 
256

Commercial construction
7,222

 
194

 
8,498

 
143

Consumer real estate
11,512

 
383

 
11,860

 
402

Other consumer
68

 
2

 
40

 
1

Total
$
37,598

 
$
927

 
$
37,888

 
$
908

The following table summarizes investments in loans considered to be impaired and related information on those impaired loans as of the dates presented:
 
September 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
2,468

 
2,501

 
260

 
964

 
2,433

 
771

Commercial construction
—

 
—

 
—

 
—

 
—

 
—

Consumer real estate
22

 
22

 
22

 
26

 
26

 
26

Other consumer
30

 
30

 
30

 
1

 
1

 
1

Total with a Related Allowance Recorded
2,520

 
2,553

 
312

 
991

 
2,460

 
798

Without a related allowance recorded:
 
 
 
 
 
 
 
 
 
 
 
Commercial real estate
6,341

 
6,985

 
—

 
16,352

 
17,654

 
—

Commercial and industrial
6,075

 
8,245

 
—

 
5,902

 
7,699

 
—

Commercial construction
5,974

 
8,629

 
—

 
6,613

 
10,306

 
—

Consumer real estate
11,054

 
11,979

 
—

 
12,053

 
12,849

 
—

Other consumer
24

 
30

 
—

 
24

 
31

 
—

Total without a Related Allowance Recorded
29,468

 
35,868

 
—

 
40,944

 
48,539

 
—

Total:
 
 
 
 
 
 
 
 
 
 
 
Commercial real estate
6,341

 
6,985

 
—

 
16,352

 
17,654

 
—

Commercial and industrial
8,543

 
10,746

 
260

 
6,866

 
10,132

 
771

Commercial construction
5,974

 
8,629

 
—

 
6,613

 
10,306

 
—

Consumer real estate
11,076

 
12,001

 
22

 
12,079

 
12,875

 
26

Other consumer
54

 
60

 
30

 
25

 
32

 
1

Total
$
31,988

 
$
38,421

 
$
312

 
$
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:
 
For the Three Months Ended
 
September 30, 2017
 
September 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
2,406

 
37

 
2,437

 
37

Commercial construction
—

 
—

 
—

 
—

Consumer real estate
23

 
1

 
28

 
—

Other consumer
32

 
2

 
2

 
—

Total with a Related Allowance Recorded
2,461

 
40

 
2,467

 
37

Without a related allowance recorded:
 
 
 
 
 
 
 
Commercial real estate
6,415

 
105

 
7,582

 
38

Commercial and industrial
9,074

 
130

 
7,326

 
52

Commercial construction
7,140

 
154

 
8,039

 
49

Consumer real estate
11,149

 
250

 
11,686

 
159

Other consumer
28

 
—

 
32

 
—

Total without a Related Allowance Recorded
33,806

 
639

 
34,665

 
298

Total:
 
 
 
 
 
 
 
Commercial real estate
6,415

 
105

 
7,582

 
38

Commercial and industrial
11,480

 
167

 
9,763

 
89

Commercial construction
7,140

 
154

 
8,039

 
49

Consumer real estate
11,172

 
251

 
11,714

 
159

Other consumer
60

 
2

 
34

 
—

Total
$
36,267

 
$
679

 
$
37,132

 
$
335
Summary of Allowance for Loan Losses
The following tables detail activity in the ALL for the periods presented:
 
Three Months Ended September 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
$
24,358

 
$
9,256

 
$
13,944

 
$
5,803

 
$
1,990

 
$
55,351

Charge-offs
(37
)
 
(644
)
 
(1,453
)
 
(101
)
 
(425
)
 
(2,660
)
Recoveries
182

 
243

 
473

 
91

 
182

 
1,171

Net (Charge-offs)/ Recoveries
145

 
(401
)
 
(980
)
 
(10
)
 
(243
)
 
(1,489
)
Provision for loan losses
472

 
859

 
1,951

 
(262
)
 
(170
)
 
2,850

Balance at End of Period
$
24,975

 
$
9,714

 
$
14,915

 
$
5,531

 
$
1,577

 
$
56,712

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Nine Months Ended September 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
(2,100
)
 
(4,041
)
 
(2,097
)
 
(1,957
)
 
(1,228
)
 
(11,423
)
Recoveries
415

 
499

 
842

 
270

 
433

 
2,459

Net (Charge-offs)/Recoveries
(1,685
)
 
(3,542
)
 
(1,255
)
 
(1,687
)
 
(795
)
 
(8,964
)
Provision for loan losses
6,684

 
2,446

 
2,171

 
1,123

 
477

 
12,901

Balance at End of Period
$
24,975

 
$
9,714

 
$
14,915

 
$
5,531

 
$
1,577

 
$
56,712

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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
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, 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
$
—

 
$
24,975

 
$
24,975

 
$
6,341

 
$
2,675,352

 
$
2,681,693

Commercial and industrial
260

 
9,454

 
9,714

 
8,543

 
1,438,268

 
1,446,811

Commercial construction
—

 
14,915

 
14,915

 
5,974

 
426,913

 
432,887

Consumer real estate
22

 
5,509

 
5,531

 
11,076

 
1,178,647

 
1,189,723

Other consumer
30

 
1,547

 
1,577

 
54

 
69,590

 
69,644

Total
$
312

 
$
56,400

 
$
56,712

 
$
31,988

 
$
5,788,770

 
$
5,820,758

 
 
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