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Loans and Allowance for Credit Losses (Tables)
 6 Months Ended
Jun. 30, 2018
Receivables [Abstract]  
Summary of Gross Loans by Type
Loans, net of unearned income are summarized as follows:
 
June 30,
2018
 
December 31, 2017
 
(in thousands)
Real-estate - commercial mortgage
$
6,304,475

 
$
6,364,804

Commercial - industrial, financial and agricultural
4,264,602

 
4,300,297

Real-estate - residential mortgage
2,094,530

 
1,954,711

Real-estate - home equity
1,491,395

 
1,559,719

Real-estate - construction
990,705

 
1,006,935

Consumer
360,315

 
313,783

Leasing and other
315,243

 
291,556

Overdrafts
1,778

 
4,113

Loans, gross of unearned income
15,823,043

 
15,795,918

Unearned income
(30,074
)
 
(27,671
)
Loans, net of unearned income
$
15,792,969

 
$
15,768,247
Schedule of Allowance for Credit Losses
The following table presents the components of the allowance for credit losses:
 
June 30,
2018
 
December 31,
2017
 
(in thousands)
Allowance for loan losses
$
156,050

 
$
169,910

Reserve for unfunded lending commitments
13,197

 
6,174

Allowance for credit losses
$
169,247

 
$
176,084
Activity in the Allowance for Credit Losses
The following table presents the activity in the allowance for credit losses:
 
Three months ended June 30
 
Six months ended June 30
 
2018
 
2017
 
2018
 
2017
 
(in thousands)
Balance at beginning of period
$
176,019

 
$
172,647

 
$
176,084

 
$
171,325

Loans charged off
(42,160
)
 
(8,715
)
 
(48,557
)
 
(18,122
)
Recoveries of loans previously charged off
2,271

 
4,366

 
4,633

 
10,295

Net loans charged off
(39,889
)
 
(4,349
)
 
(43,924
)
 
(7,827
)
Provision for credit losses
33,117

 
6,700

 
37,087

 
11,500

Balance at end of period
$
169,247

 
$
174,998

 
$
169,247

 
$
174,998


Included in the provision for credit losses for the three and six months ended June 30, 2018 was a $36.8 million provision related to a single, large commercial lending relationship ("Commercial Relationship"). In addition, loans charged off for the same periods included a $33.9 million charge-off related to the Commercial Relationship.

The Corporation has historically maintained an unallocated allowance for credit losses for factors and conditions that exist at the balance sheet date, but are not specifically identifiable, and to recognize the inherent imprecision in estimating and measuring loss exposure. In the second quarter of 2017, enhancements were made to allow for the impact of these factors and conditions to be quantified in the allowance allocation process. Accordingly, an unallocated allowance for credit losses is no longer necessary.

The following table presents the activity in the allowance for loan losses by portfolio segment:
 
Real Estate -
Commercial
Mortgage
 
Commercial -
Industrial,
Financial and
Agricultural
 
Real Estate -
Home
Equity
 
Real Estate -
Residential
Mortgage
 
Real Estate -
Construction
 
Consumer
 
Leasing, other
and
overdrafts
 
Unallocated
 
Total
 
(in thousands)
Three months ended June 30, 2018
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Balance at March 31, 2018
$
58,717

 
$
61,830

 
$
17,528

 
$
15,261

 
$
5,924

 
$
1,903

 
$
2,054

 
$
—

 
$
163,217

Loans charged off
(366
)
 
(38,632
)
 
(816
)
 
(483
)
 
(606
)
 
(712
)
 
(545
)
 
—

 
(42,160
)
Recoveries of loans previously charged off
321

 
541

 
271

 
96

 
444

 
446

 
152

 
—

 
2,271

Net loans charged off
(45
)
 
(38,091
)
 
(545
)
 
(387
)
 
(162
)
 
(266
)
 
(393
)
 
—

 
(39,889
)
Provision for loan losses (1)
(2,089
)
 
35,306

 
(736
)
 
(370
)
 
226

 
62

 
323

 
—

 
32,722

Balance at June 30, 2018
$
56,583

 
$
59,045

 
$
16,247

 
$
14,504

 
$
5,988

 
$
1,699

 
$
1,984

 
$
—

 
$
156,050

Three months ended June 30, 2017
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Balance at March 31, 2017
$
47,373

 
$
55,309

 
$
23,821

 
$
22,018

 
$
7,501

 
$
3,031

 
$
3,268

 
$
7,755

 
$
170,076

Loans charged off
(242
)
 
(5,353
)
 
(592
)
 
(124
)
 
(774
)
 
(430
)
 
(1,200
)
 
—

 
(8,715
)
Recoveries of loans previously charged off
934

 
1,974

 
215

 
151

 
373

 
470

 
249

 
—

 
4,366

Net loans charged off
692

 
(3,379
)
 
(377
)
 
27

 
(401
)
 
40

 
(951
)
 
—

 
(4,349
)
Provision for loan losses (1)
9,307

 
15,712

 
(5,988
)
 
(5,606
)
 
2,434

 
(1,277
)
 
(212
)
 
(7,755
)
 
6,615

Balance at June 30, 2017
$
57,372

 
$
67,642

 
$
17,456

 
$
16,439

 
$
9,534

 
$
1,794

 
$
2,105

 
$
—

 
$
172,342

Six months ended June 30, 2018
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Balance at December 31, 2017
$
58,793

 
$
66,280

 
$
18,127

 
$
16,088

 
$
6,620

 
$
2,045

 
$
1,957

 
$
—

 
$
169,910

Loans charged off
(633
)
 
(42,637
)
 
(1,224
)
 
(645
)
 
(764
)
 
(1,604
)
 
(1,050
)
 
—

 
(48,557
)
Recoveries of loans previously charged off
600

 
1,616

 
477

 
203

 
750

 
625

 
362

 
—

 
4,633

Net loans charged off
(33
)
 
(41,021
)
 
(747
)
 
(442
)
 
(14
)
 
(979
)
 
(688
)
 
—

 
(43,924
)
Provision for loan losses (1)
(2,177
)
 
33,786

 
(1,133
)
 
(1,142
)
 
(618
)
 
633

 
715

 
—

 
30,064

Balance at June 30, 2018
$
56,583

 
$
59,045

 
$
16,247

 
$
14,504

 
$
5,988

 
$
1,699

 
$
1,984

 
$
—

 
$
156,050

Six months ended June 30, 2017
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Balance at December 31, 2016
$
46,842

 
$
54,353

 
$
26,801

 
$
22,929

 
$
6,455

 
$
3,574

 
$
3,192

 
$
4,533

 
$
168,679

Loans charged off
(1,466
)
 
(10,880
)
 
(1,290
)
 
(340
)
 
(1,021
)
 
(1,286
)
 
(1,839
)
 
—

 
(18,122
)
Recoveries of loans previously charged off
1,384

 
6,165

 
352

 
381

 
921

 
706

 
386

 
—

 
10,295

Net loans charged off
(82
)
 
(4,715
)
 
(938
)
 
41

 
(100
)
 
(580
)
 
(1,453
)
 
—

 
(7,827
)
Provision for loan losses (1)
10,612

 
18,004

 
(8,407
)
 
(6,531
)
 
3,179

 
(1,200
)
 
366

 
(4,533
)
 
11,490

Balance at June 30, 2017
$
57,372

 
$
67,642

 
$
17,456

 
$
16,439

 
$
9,534

 
$
1,794

 
$
2,105

 
$
—

 
$
172,342


(1)
The provision for loan losses excluded a $395,000 and a $7.0 million increase in the reserve for unfunded lending commitments for the three and six months ended June 30, 2018, respectively, and an $85,000 and a $10,000 increase in the reserve for unfunded lending commitments for the three and six months ended June 30, 2017, respectively. These amounts were reclassified to other liabilities on the consolidated balance sheets.

The following table presents loans, net of unearned income and their related allowance for loan losses, by portfolio segment:
 
Real Estate -
Commercial
Mortgage
 
Commercial -
Industrial,
Financial and
Agricultural
 
Real Estate -
Home
Equity
 
Real Estate -
Residential
Mortgage
 
Real Estate -
Construction
 
Consumer
 
Leasing, other
and
overdrafts
 
Total
 
(in thousands)
Allowance for loan losses at June 30, 2018:
 
 
 
 
 
 
 
 
 
 
 
 
Loans collectively evaluated for impairment
$
48,489

 
$
49,354

 
$
5,093

 
$
5,171

 
$
5,338

 
$
1,691

 
$
1,984

 
$
117,120

Loans individually evaluated for impairment
8,094

 
9,691

 
11,154

 
9,333

 
650

 
8

 
—

 
38,930

 
$
56,583

 
$
59,045

 
$
16,247

 
$
14,504

 
$
5,988

 
$
1,699

 
$
1,984

 
$
156,050

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Loans, net of unearned income at June 30, 2018
 
 
 
 
 
 
 
 
 
 
 
 
Loans collectively evaluated for impairment
$
6,252,747

 
$
4,209,786

 
$
1,466,393

 
$
2,055,206

 
$
981,584

 
$
360,304

 
$
286,947

 
$
15,612,967

Loans individually evaluated for impairment
51,728

 
54,816

 
25,002

 
39,324

 
9,121

 
11

 
—

 
180,002

 
$
6,304,475

 
$
4,264,602

 
$
1,491,395

 
$
2,094,530

 
$
990,705

 
$
360,315

 
$
286,947

 
$
15,792,969

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Allowance for loan losses at June 30, 2017:
 
 
 
 
 
 
 
 
 
 
 
 
Loans collectively evaluated for impairment
$
49,055

 
$
57,341

 
$
7,607

 
$
6,013

 
$
5,370

 
$
1,773

 
$
2,105

 
$
129,264

Loans individually evaluated for impairment
8,317

 
10,301

 
9,849

 
10,426

 
4,164

 
21

 
—

 
43,078

 
$
57,372

 
$
67,642

 
$
17,456

 
$
16,439

 
$
9,534

 
$
1,794

 
$
2,105

 
$
172,342

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Loans, net of unearned income at June 30, 2017:
 
 
 
 
 
 
 
 
 
 
 
 
Loans collectively evaluated for impairment
$
6,212,998

 
$
4,189,676

 
$
1,557,989

 
$
1,741,404

 
$
921,839

 
$
283,123

 
$
252,253

 
$
15,159,282

Loans individually evaluated for impairment
49,010

 
56,173

 
21,750

 
43,308

 
17,061

 
33

 
—

 
187,335

 
$
6,262,008

 
$
4,245,849

 
$
1,579,739

 
$
1,784,712

 
$
938,900

 
$
283,156

 
$
252,253

 
$
15,346,617
Total Impaired Loans by Class Segment
The following table presents total impaired loans by class segment:
 
June 30, 2018
 
December 31, 2017
 
Unpaid
Principal
Balance
 
Recorded
Investment
 
Related
Allowance
 
Unpaid
Principal
Balance
 
Recorded
Investment
 
Related
Allowance
 
(in thousands)
With no related allowance recorded:
 
 
 
 
 
 
 
 
 
 
Real estate - commercial mortgage
$
27,582

 
$
26,435

 
$
—

 
$
26,728

 
$
22,886

 
$
—

Commercial
41,971

 
26,761

 
—

 
44,936

 
39,550

 
—

Real estate - residential mortgage
3,193

 
3,193

 
—

 
4,575

 
4,575

 
—

Construction
11,162

 
7,213

 
—

 
12,477

 
8,100

 
—

 
83,908

 
63,602

 
—

 
88,716

 
75,111

 
—

With a related allowance recorded:
 
 
 
 
 
 
 
 
 
 
Real estate - commercial mortgage
32,432

 
25,293

 
8,094

 
33,710

 
25,895

 
8,112

Commercial
50,734

 
28,055

 
9,691

 
29,816

 
24,175

 
11,406

Real estate - home equity
28,776

 
25,002

 
11,154

 
28,282

 
24,693

 
11,124

Real estate - residential mortgage
41,025

 
36,131

 
9,333

 
42,597

 
37,132

 
9,895

Construction
5,595

 
1,908

 
650

 
7,308

 
4,097

 
967

Consumer
11

 
11

 
8

 
26

 
26

 
17

 
158,573

 
116,400

 
38,930

 
141,739

 
116,018

 
41,521

Total
$
242,481

 
$
180,002

 
$
38,930

 
$
230,455

 
$
191,129

 
$
41,521


As of June 30, 2018 and December 31, 2017, there were $63.6 million and $75.1 million, respectively, of impaired loans that did not have a related allowance for loan loss. The estimated fair values of the collateral securing these loans exceeded their carrying amount, or the loans were previously charged down to realizable collateral values. Accordingly, no specific valuation allowance was considered to be necessary.
The following table presents average impaired loans by class segment:
 
Three months ended June 30
 
Six months ended June 30
 
2018
 
2017
 
2018
 
2017
 
Average
Recorded
Investment
 
Interest
Income (1)
 
Average
Recorded
Investment
 
Interest
Income (1)
 
Average
Recorded
Investment
 
Interest
Income (1)
 
Average
Recorded
Investment
 
Interest
Income (1)
 
(in thousands)
With no related allowance recorded:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Real estate - commercial mortgage
$
27,127

 
$
97

 
$
22,316

 
$
71

 
$
25,713

 
$
180

 
$
23,360

 
141

Commercial
33,644

 
69

 
30,829

 
46

 
35,612

 
142

 
29,061

 
82

Real estate - residential mortgage
3,870

 
24

 
4,643

 
26

 
4,105

 
51

 
4,658

 
52

Construction
7,528

 
—

 
6,965

 
4

 
7,718

 
—

 
6,242

 
6

 
72,169

 
190

 
64,753

 
147

 
73,148

 
373

 
63,321

 
281

With a related allowance recorded:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Real estate - commercial mortgage
25,419

 
91

 
27,710

 
88

 
25,578

 
175

 
28,288

 
173

Commercial
26,120

 
54

 
21,387

 
31

 
25,471

 
97

 
22,074

 
63

Real estate - home equity
24,907

 
195

 
20,352

 
117

 
24,835

 
379

 
19,969

 
212

Real estate - residential mortgage
36,261

 
223

 
39,500

 
225

 
36,551

 
444

 
40,119

 
455

Construction
2,400

 
—

 
8,446

 
4

 
2,966

 
—

 
7,542

 
7

Consumer
18

 
—

 
36

 
—

 
20

 
—

 
36

 
—

Leasing, other and overdrafts
—

 
—

 
—

 
—

 
—

 
—

 
475

 
—

 
115,125

 
563

 
117,431

 
465

 
115,421

 
1,095

 
118,503

 
910

Total
$
187,294

 
$
753

 
$
182,184

 
$
612

 
$
188,569

 
$
1,468

 
$
181,824

 
1,191

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(1)
All impaired loans, excluding accruing TDRs, were non-accrual loans. Interest income recognized for the three and six months ended June 30, 2018 and 2017 represents amounts earned on accruing TDRs.
Financing Receivable Credit Quality Indicators
The following table presents internal credit risk ratings for the indicated loan class segments:
 
Pass
 
Special Mention
 
Substandard or Lower
 
Total
 
June 30, 2018
 
December 31, 2017
 
June 30, 2018
 
December 31, 2017
 
June 30, 2018
 
December 31, 2017
 
June 30, 2018
 
December 31, 2017
 
(dollars in thousands)
Real estate - commercial mortgage
$
5,990,838

 
$
6,066,396

 
$
164,908

 
$
147,604

 
$
148,729

 
$
150,804

 
$
6,304,475

 
$
6,364,804

Commercial - secured
3,823,052

 
3,831,485

 
139,345

 
121,842

 
146,190

 
179,113

 
4,108,587

 
4,132,440

Commercial - unsecured
147,914

 
159,620

 
3,726

 
5,478

 
4,375

 
2,759

 
156,015

 
167,857

Total commercial - industrial, financial and agricultural
3,970,966

 
3,991,105

 
143,071

 
127,320

 
150,565

 
181,872

 
4,264,602

 
4,300,297

Construction - commercial residential
128,641

 
143,759

 
3,996

 
5,259

 
10,429

 
14,084

 
143,066

 
163,102

Construction - commercial
762,920

 
761,218

 
344

 
846

 
5,382

 
3,752

 
768,646

 
765,816

Total construction (excluding Construction - other)
891,561

 
904,977

 
4,340

 
6,105

 
15,811

 
17,836

 
911,712

 
928,918

 
$
10,853,365

 
$
10,962,478

 
$
312,319

 
$
281,029

 
$
315,105

 
$
350,512

 
$
11,480,789

 
$
11,594,019

% of Total
94.5
%
 
94.6
%
 
2.7
%
 
2.4
%
 
2.7
%
 
3.0
%
 
100.0
%
 
100.0
%
The following table presents a summary of performing, delinquent and non-performing loans for the indicated loan class segments:
 
Performing
 
Delinquent (1)
 
Non-performing (2)
 
Total
 
June 30, 2018
 
December 31, 2017
 
June 30, 2018
 
December 31, 2017
 
June 30, 2018
 
December 31, 2017
 
June 30, 2018
 
December 31, 2017
 
(dollars in thousands)
Real estate - home equity
$
1,470,006

 
$
1,535,557

 
$
9,703

 
$
12,655

 
$
11,686

 
$
11,507

 
$
1,491,395

 
$
1,559,719

Real estate - residential mortgage
2,054,810

 
1,914,888

 
20,832

 
18,852

 
18,888

 
20,971

 
2,094,530

 
1,954,711

Construction - other
78,503

 
77,403

 
—

 
203

 
490

 
411

 
78,993

 
78,017

Consumer - direct
62,142

 
54,828

 
108

 
315

 
83

 
70

 
62,333

 
55,213

Consumer - indirect
294,686

 
254,663

 
3,027

 
3,681

 
269

 
226

 
297,982

 
258,570

Total consumer
356,828

 
309,491

 
3,135

 
3,996

 
352

 
296

 
360,315

 
313,783

Leasing, other and overdrafts
285,722

 
267,111

 
1,049

 
855

 
176

 
32

 
286,947

 
267,998

 
$
4,245,869

 
$
4,104,450

 
$
34,719

 
$
36,561

 
$
31,592

 
$
33,217

 
$
4,312,180

 
$
4,174,228

% of Total
98.5
%
 
98.3
%
 
0.8
%
 
0.9
%
 
0.7
%
 
0.8
%
 
100.0
%
 
100.0
%

(1)
Includes all accruing loans 30 days to 89 days past due.
(2)
Includes all accruing loans 90 days or more past due and all non-accrual loans.
Non-Performing Assets
The following table presents non-performing assets:
 
June 30,
2018
 
December 31,
2017
 
(in thousands)
Non-accrual loans
$
111,116

 
$
124,749

Loans 90 days or more past due and still accruing
12,628

 
10,010

Total non-performing loans
123,744

 
134,759

Other real estate owned (OREO)
11,181

 
9,823

Total non-performing assets
$
134,925

 
$
144,582
Past due Loan Status and Non-Accrual Loans by Portfolio Segment
The following tables present past due status and non-accrual loans by portfolio segment and class segment:
 
June 30, 2018
 
30-59
Days Past
Due
 
60-89
Days Past
Due
 
≥ 90 Days
Past Due
and
Accruing
 
Non-
accrual
 
Total ≥ 90
Days
 
Total Past
Due
 
Current
 
Total
 
(in thousands)
Real estate - commercial mortgage
$
8,537

 
$
961

 
$
3,970

 
$
35,308

 
$
39,278

 
$
48,776

 
$
6,255,699

 
$
6,304,475

Commercial - secured
14,687

 
2,249

 
299

 
43,005

 
43,304

 
60,240

 
4,048,347

 
4,108,587

Commercial - unsecured
350

 
162

 
129

 
612

 
741

 
1,253

 
154,762

 
156,015

Total commercial - industrial, financial and agricultural
15,037

 
2,411

 
428

 
43,617

 
44,045

 
61,493

 
4,203,109

 
4,264,602

Real estate - home equity
8,053

 
1,650

 
2,885

 
8,801

 
11,686

 
21,389

 
1,470,006

 
1,491,395

Real estate - residential mortgage
15,333

 
5,499

 
4,619

 
14,269

 
18,888

 
39,720

 
2,054,810

 
2,094,530

Construction - commercial residential
560

 
184

 
—

 
8,810

 
8,810

 
9,554

 
133,511

 
143,065

Construction - commercial
—

 
—

 
—

 
19

 
19

 
19

 
768,628

 
768,647

Construction - other
—

 
—

 
198

 
292

 
490

 
490

 
78,503

 
78,993

Total real estate - construction
560

 
184

 
198

 
9,121

 
9,319

 
10,063

 
980,642

 
990,705

Consumer - direct
45

 
63

 
83

 
—

 
83

 
191

 
62,142

 
62,333

Consumer - indirect
2,535

 
492

 
269

 
—

 
269

 
3,296

 
294,686

 
297,982

Total consumer
2,580

 
555

 
352

 
—

 
352

 
3,487

 
356,828

 
360,315

Leasing, other and overdrafts
805

 
244

 
176

 
—

 
176

 
1,225

 
285,722

 
286,947

Total
$
50,905

 
$
11,504

 
$
12,628

 
$
111,116

 
$
123,744

 
$
186,153

 
$
15,606,816

 
$
15,792,969

 
December 31, 2017
 
30-59
Days Past
Due
 
60-89
Days Past
Due
 
≥ 90 Days
Past Due
and
Accruing
 
Non-
accrual
 
Total ≥ 90
Days
 
Total Past
Due
 
Current
 
Total
 
(in thousands)
Real estate - commercial mortgage
$
9,456

 
$
4,223

 
$
625

 
$
34,822

 
$
35,447

 
$
49,126

 
$
6,315,678

 
$
6,364,804

Commercial - secured
4,778

 
5,254

 
1,360

 
52,255

 
53,615

 
63,647

 
4,068,793

 
4,132,440

Commercial - unsecured
305

 
10

 
45

 
649

 
694

 
1,009

 
166,848

 
167,857

Total commercial - industrial, financial and agricultural
5,083

 
5,264

 
1,405

 
52,904

 
54,309

 
64,656

 
4,235,641

 
4,300,297

Real estate - home equity
9,640

 
3,015

 
2,372

 
9,135

 
11,507

 
24,162

 
1,535,557

 
1,559,719

Real estate - residential mortgage
11,961

 
6,891

 
5,280

 
15,691

 
20,971

 
39,823

 
1,914,888

 
1,954,711

Construction - commercial residential
—

 
439

 
—

 
11,767

 
11,767

 
12,206

 
150,896

 
163,102

Construction - commercial
483

 
—

 
—

 
19

 
19

 
502

 
765,314

 
765,816

Construction - other
203

 
—

 
—

 
411

 
411

 
614

 
77,403

 
78,017

Total real estate - construction
686

 
439

 
—

 
12,197

 
12,197

 
13,322

 
993,613

 
1,006,935

Consumer - direct
260

 
55

 
70

 
—

 
70

 
385

 
54,828

 
55,213

Consumer - indirect
3,055

 
626

 
226

 
—

 
226

 
3,907

 
254,663

 
258,570

Total consumer
3,315

 
681

 
296

 
—

 
296

 
4,292

 
309,491

 
313,783

Leasing, other and overdrafts
568

 
287

 
32

 
—

 
32

 
887

 
267,111

 
267,998

Total
$
40,709

 
$
20,800

 
$
10,010

 
$
124,749

 
$
134,759

 
$
196,268

 
$
15,571,979

 
$
15,768,247
Troubled Debt Restructurings on Financing Receivables
The following table presents TDRs, by class segment:
 
June 30,
2018
 
December 31,
2017
 
(in thousands)
Real-estate - residential mortgage
$
25,055

 
$
26,016

Real-estate - commercial mortgage
16,420

 
13,959

Real estate - home equity
16,201

 
15,558

Commercial
11,199

 
10,820

Consumer
11

 
26

Total accruing TDRs
68,886

 
66,379

Non-accrual TDRs (1)
24,743

 
29,051

Total TDRs
$
93,629

 
$
95,430

 
(1)
Included in non-accrual loans in the preceding table detailing non-performing assets
Loan Terms Modified Under Troubled Debt Restructurings
The following table presents TDRs, by class segment, as of June 30, 2018 and 2017 that were modified in the previous 12 months and had a post-modification payment default during the six months ended June 30, 2018 and 2017. The Corporation defines a payment default as a single missed payment.
 
2018
 
2017
 
Number of Loans
 
Recorded Investment
 
Number of Loans
 
Recorded Investment
 
(dollars in thousands)
Real estate - residential mortgage
8

 
$
863

 
7

 
$
1,911

Real estate - commercial mortgage
1

 
176

 
3

 
674

Real estate - home equity
29

 
1,955

 
16

 
922

Commercial
5

 
146

 
5

 
2,772

Consumer
—

 
—

 
1

 
16

Total
43

 
$
3,140

 
32

 
$
6,295

The following table presents TDRs, by class segment and type of concession for loans that were modified during the three and six months ended June 30, 2018 and 2017:
 
 
Three months ended June 30
 
Six months ended June 30
 
2018
 
2017
 
2018
 
2017
Number of Loans
 
Post-Modification Recorded Investment
 
Number of Loans
 
Post-Modification Recorded Investment
 
Number of Loans
 
Post-Modification Recorded Investment
 
Number of Loans
 
Post-Modification Recorded Investment
 
(dollars in thousands)
Real estate – residential mortgage:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Extend maturity without rate concession
1

 
$
77

 
—

 
$
—

 
1

 
$
77

 
2

 
$
337

 
Bankruptcy
—

 
—

 
1

 
157

 
1

 
5

 
2

 
335

Real estate - commercial mortgage:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Extend maturity without rate concession
1

 
4

 
3

 
663

 
6

 
8,261

 
4

 
981

 
Bankruptcy
—

 
—

 
1

 
12

 
—

 
—

 
1

 
12

Real estate - home equity:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Extend maturity without rate concession
23

 
1,346

 
17

 
1,275

 
40

 
2,622

 
33

 
2,559

 
Bankruptcy
5

 
313

 
10

 
1,063

 
7

 
421

 
17

 
1,516

Commercial:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Extend maturity without rate concession
1

 
49

 
5

 
2,600

 
5

 
1,151

 
8

 
5,693

 
Bankruptcy
—

 
—

 
1

 
490

 
—

 
—

 
2

 
523

Construction - commercial residential:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Extend maturity without rate concession
—

 
—

 
1

 
1,204

 
—

 
—

 
1

 
1,204

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total
31

 
$
1,789

 
39

 
$
7,464

 
60

 
$
12,537

 
70

 
$
13,160