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Allowance for Loan Losses (Tables)
 12 Months Ended
Dec. 31, 2018
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:
 
December 31, 2018
(dollars in thousands)
Current

 
30-59 Days
Past Due

 
60-89 Days
Past Due

 
Non-
performing

 
Total
Past Due
Loans

 
Total Loans

Commercial real estate
$
2,903,997

 
$
3,638

 
$
2,145

 
$
12,052

 
$
17,835

 
$
2,921,832

Commercial and industrial
1,482,473

 
1,000

 
983

 
8,960

 
10,943

 
1,493,416

Commercial construction
243,004

 
—

 
—

 
14,193

 
14,193

 
257,197

Residential mortgage
717,447

 
1,584

 
520

 
7,128

 
9,232

 
726,679

Home equity
465,152

 
2,103

 
609

 
3,698

 
6,410

 
471,562

Installment and other consumer
67,281

 
148

 
75

 
42

 
265

 
67,546

Consumer construction
8,416

 
—

 
—

 
—

 
—

 
8,416

Loans held for sale
2,371

 
—

 
—

 
—

 
—

 
2,371

Total
$
5,890,141

 
$
8,473

 
$
4,332

 
$
46,073

 
$
58,878

 
$
5,949,019

 
December 31, 2017
(dollars in thousands)
Current

 
30-59 Days
Past Due

 
60-89 Days
Past Due

 
Non-
performing

 
Total
Past Due
Loans

 
Total Loans

Commercial real estate
$
2,681,395

 
$
997

 
$
134

 
$
3,468

 
$
4,599

 
$
2,685,994

Commercial and industrial
1,426,754

 
420

 
446

 
5,646

 
6,512

 
1,433,266

Commercial construction
377,968

 
2,473

 
20

 
3,873

 
6,366

 
384,334

Residential mortgage
687,195

 
2,975

 
1,439

 
7,165

 
11,579

 
698,774

Home equity
480,956

 
2,065

 
590

 
3,715

 
6,370

 
487,326

Installment and other consumer
66,770

 
193

 
170

 
71

 
434

 
67,204

Consumer construction
4,551

 
—

 
—

 
—

 
—

 
4,551

Loans held for sale
4,485

 
—

 
—

 
—

 
—

 
4,485

Total
$
5,730,074

 
$
9,123

 
$
2,799

 
$
23,938

 
$
35,860

 
$
5,765,934
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:
 
December 31, 2018
(dollars in thousands)
Commercial
Real Estate

 
% of
Total

 
Commercial
and Industrial

 
% of
Total

 
Commercial
Construction

 
% of
Total

 
Total

 
% of
Total

Pass
$
2,776,292

 
95.0
%
 
$
1,394,427

 
93.4
%
 
$
233,190

 
90.7
%
 
$
4,403,909

 
94.3
%
Special mention
54,627

 
1.9
%
 
25,368

 
1.7
%
 
7,349

 
2.8
%
 
87,344

 
1.8
%
Substandard
90,913

 
3.1
%
 
73,621

 
4.9
%
 
16,658

 
6.5
%
 
181,192

 
3.9
%
Total
$
2,921,832

 
100.0
%
 
$
1,493,416

 
100.0
%
 
$
257,197

 
100.0
%
 
$
4,672,445

 
100.0
%
 
December 31, 2017
(dollars in thousands)
Commercial
Real Estate

 
% of
Total

 
Commercial
and Industrial

 
% of
Total

 
Commercial
Construction

 
% of
Total

 
Total

 
% of
Total

Pass
$
2,588,847

 
96.4
%
 
$
1,345,810

 
93.9
%
 
$
368,105

 
95.8
%
 
$
4,302,762

 
95.5
%
Special mention
66,436

 
2.5
%
 
54,320

 
3.8
%
 
9,345

 
2.4
%
 
130,101

 
2.9
%
Substandard
30,711

 
1.1
%
 
33,136

 
2.3
%
 
6,884

 
1.8
%
 
70,731

 
1.6
%
Total
$
2,685,994

 
100.0
%
 
$
1,433,266

 
100.0
%
 
$
384,334

 
100.0
%
 
$
4,503,594

 
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:
 
December 31, 2018
(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
$
719,551

 
99.0
%
 
$
467,864

 
99.2
%
 
$
67,504

 
99.9
%
 
$
8,416

 
100.0
%
 
$
1,263,335

 
99.1
%
Nonperforming
7,128

 
1.0
%
 
3,698

 
0.8
%
 
42

 
0.1
%
 
—

 
—
%
 
10,868

 
0.9
%
Total
$
726,679

 
100.0
%
 
$
471,562

 
100.0
%
 
$
67,546

 
100.0
%
 
$
8,416

 
100.0
%
 
$
1,274,203

 
100.0
%
 
December 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
$
691,609

 
99.0
%
 
$
483,611

 
99.2
%
 
$
67,133

 
99.9
%
 
$
4,551

 
100.0
%
 
$
1,246,904

 
99.1
%
Nonperforming
7,165

 
1.0
%
 
3,715

 
0.8
%
 
71

 
0.1
%
 
—

 
—
%
 
10,951

 
0.9
%
Total
$
698,774

 
100.0
%
 
$
487,326

 
100.0
%
 
$
67,204

 
100.0
%
 
$
4,551

 
100.0
%
 
$
1,257,855

 
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:
 
December 31, 2018
 
December 31, 2017
(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
$
7,733

 
$
7,733

 
$
1,295

 
$
—

 
$
—

 
$
—

Commercial and industrial
884

 
893

 
360

 
1,735

 
1,787

 
29

Commercial construction
489

 
489

 
87

 
—

 
—

 
—

Consumer real estate
15

 
14

 
10

 
21

 
21

 
21

Other consumer
11

 
12

 
11

 
27

 
27

 
27

Total with a Related Allowance Recorded
9,132

 
9,141

 
1,763

 
1,783

 
1,835

 
77

Without a related allowance recorded:
 
 
 
 
 
 
 
 
 
 
 
Commercial real estate
3,636

 
4,046

 
—

 
3,546

 
3,811

 
—

Commercial and industrial
12,788

 
14,452

 
—

 
5,549

 
7,980

 
—

Commercial construction
15,286

 
19,198

 
—

 
5,464

 
8,132

 
—

Consumer real estate
8,659

 
9,635

 
—

 
10,467

 
11,357

 
—

Other consumer
5

 
18

 
—

 
14

 
22

 
—

Total without a Related Allowance Recorded
40,374

 
47,349

 
—

 
25,040

 
31,302

 
—

Total:
 
 
 
 
 
 
 
 
 
 
 
Commercial real estate
11,369

 
11,779

 
1,295

 
3,546

 
3,811

 
—

Commercial and industrial
13,672

 
15,345

 
360

 
7,284

 
9,767

 
29

Commercial construction
15,775

 
19,687

 
87

 
5,464

 
8,132

 
—

Consumer real estate
8,674

 
9,649

 
10

 
10,488

 
11,378

 
21

Other consumer
16

 
30

 
11

 
41

 
49

 
27

Total
$
49,506

 
$
56,490

 
$
1,763

 
$
26,823

 
$
33,137

 
$
77

The following table summarizes average recorded investment in and interest income recognized on loans considered to be impaired for the years presented:
 
For the Year Ended
 
December 31, 2018
 
December 31, 2017
(dollars in thousands)
Average
Recorded
Investment

 
Interest
Income
Recognized

 
Average
Recorded
Investment

 
Interest
Income
Recognized

With a related allowance recorded:
 
 
 
 
 
 
 
Commercial real estate
$
7,780

 
$
238

 
$
—

 
$
—

Commercial and industrial
591

 
38

 
968

 
52

Commercial construction
561

 
—

 
—

 
—

Consumer real estate
16

 
1

 
23

 
2

Other consumer
19

 
1

 
34

 
2

Total with a Related Allowance Recorded
8,967

 
278

 
1,025

 
56

Without a related allowance recorded:
 
 
 
 
 
 
 
Commercial real estate
3,911

 
172

 
6,636

 
177

Commercial and industrial
4,722

 
257

 
9,897

 
257

Commercial construction
17,643

 
217

 
6,828

 
253

Consumer real estate
9,701

 
483

 
11,037

 
487

Other consumer
24

 
—

 
23

 
—

Total without a Related Allowance Recorded
36,001

 
1,129

 
34,421

 
1,174

Total:
 
 
 
 
 
 
 
Commercial real estate
11,691

 
410

 
6,636

 
177

Commercial and industrial
5,313

 
295

 
10,865

 
309

Commercial construction
18,204

 
217

 
6,828

 
253

Consumer real estate
9,717

 
484

 
11,060

 
489

Other consumer
43

 
1

 
57

 
2

Total
$
44,968

 
$
1,407

 
$
35,446

 
$
1,230
Summary of Allowance for Loan Losses
The following tables detail activity in the ALL for the periods presented:
 
2018
(dollars in thousands)
Commercial
Real Estate

 
Commercial
and Industrial

 
Commercial
Construction

 
Consumer
Real Estate

 
Other
Consumer

 
Total Loans

Balance at beginning of year
$
27,235

 
$
8,966

 
$
13,167

 
$
5,479

 
$
1,543

 
$
56,390

Charge-offs
(372
)
 
(8,574
)
 
(2,630
)
 
(1,319
)
 
(1,694
)
 
(14,589
)
Recoveries
309

 
1,723

 
1,135

 
541

 
492

 
4,200

Net (Charge-offs) Recoveries
(63
)
 
(6,851
)
 
(1,495
)
 
(778
)
 
(1,202
)
 
(10,389
)
Provision for loan losses
6,535

 
9,481

 
(3,689
)
 
1,486

 
1,182

 
14,995

Balance at End of Year
$
33,707

 
$
11,596

 
$
7,983

 
$
6,187

 
$
1,523

 
$
60,996

 
2017
(dollars in thousands)
Commercial
Real Estate

 
Commercial
and Industrial

 
Commercial
Construction

 
Consumer
Real Estate

 
Other
Consumer

 
Total Loans

Balance at beginning of year
$
19,976

 
$
10,810

 
$
13,999

 
$
6,095

 
$
1,895

 
$
52,775

Charge-offs
(2,304
)
 
(4,709
)
 
(2,571
)
 
(2,274
)
 
(1,638
)
 
(13,496
)
Recoveries
810

 
654

 
851

 
342

 
571

 
3,228

Net Recoveries (Charge-offs)
(1,494
)
 
(4,055
)
 
(1,720
)
 
(1,932
)
 
(1,067
)
 
(10,268
)
Provision for loan losses
8,753

 
2,211

 
888

 
1,316

 
715

 
13,883

Balance at End of Year
$
27,235

 
$
8,966

 
$
13,167

 
$
5,479

 
$
1,543

 
$
56,390
Summary of Allowance for Loan Losses and Recorded Investments
The following tables present the ALL and recorded investments in loans by category as of December 31:
 
2018
 
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
$
1,295

 
$
32,412

 
$
33,707

 
$
11,369

 
$
2,910,463

 
$
2,921,832

Commercial and industrial
360

 
11,236

 
11,596

 
13,672

 
1,479,744

 
1,493,416

Commercial construction
87

 
7,896

 
7,983

 
15,775

 
241,422

 
257,197

Consumer real estate
10

 
6,177

 
6,187

 
8,674

 
1,197,983

 
1,206,657

Other consumer
11

 
1,512

 
1,523

 
16

 
67,530

 
67,546

Total
$
1,763

 
$
59,233

 
$
60,996

 
$
49,506

 
$
5,897,142

 
$
5,946,648

 
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
$
—

 
$
27,235

 
$
27,235

 
$
3,546

 
$
2,682,448

 
$
2,685,994

Commercial and industrial
29

 
8,937

 
8,966

 
7,284

 
1,425,982

 
1,433,266

Commercial construction
—

 
13,167

 
13,167

 
5,464

 
378,870

 
384,334

Consumer real estate
21

 
5,458

 
5,479

 
10,488

 
1,180,163

 
1,190,651

Other consumer
27

 
1,516

 
1,543

 
41

 
67,163

 
67,204

Total
$
77

 
$
56,313

 
$
56,390

 
$
26,823

 
$
5,734,626

 
$
5,761,449