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Allowance for Credit Losses and Credit Quality (Tables)
 12 Months Ended
Dec. 31, 2018
Receivables [Abstract]  
Schedule of Allowance for Loan Losses for Covered and Non-Covered Loan Portfolios
A summary of changes in the allowance for credit losses for the years ended December 31 is as follows:
(Dollars in thousands)
2018
 
2017
 
2016
Allowance for credit losses
 
 
 
 
 
Allowance for loan and lease losses at beginning of period
$
140,891

 
$
144,719

 
$
138,378

Provision for loan and lease losses before adjustment attributable to FDIC loss share agreements
39,472

 
51,111

 
42,927

Adjustment attributable to FDIC loss share arrangements
—

 
—

 
1,497

Net provision for loan and lease losses
39,472

 
51,111

 
44,424

Adjustment attributable to FDIC loss share arrangements
—

 
—

 
(1,497
)
Transfer of balance to OREO and other
(7,172
)
 
934

 
(2,781
)
Charge-offs
(45,547
)
 
(62,466
)
 
(39,839
)
Recoveries
12,927

 
6,593

 
6,034

Allowance for loan and lease losses at end of period
$
140,571

 
$
140,891

 
$
144,719

 
 
 
 
 
 
Reserve for unfunded commitments at beginning of period
$
13,208

 
$
11,241

 
$
14,145

Balance created in acquisition accounting
709

 
1,370

 
—

Provision for (Reversal of) unfunded lending commitments
913

 
597

 
(2,904
)
Reserve for unfunded commitments at end of period
$
14,830

 
$
13,208

 
$
11,241

Allowance for credit losses at end of period
$
155,401

 
$
154,099

 
$
155,960

A summary of changes in the allowance for credit losses, by loan portfolio type, for the years ended December 31 is as follows:
 
2018
(Dollars in thousands)
Commercial
Real Estate
 
Commercial
and Industrial
 
Residential
Mortgage
 
Consumer
 
Total
Allowance for loan and lease losses at beginning of period
$
54,201

 
$
53,916

 
$
9,117

 
$
23,657

 
$
140,891

Provision for (Reversal of) loan and lease losses
(829
)
 
23,866

 
4,200

 
12,235

 
39,472

Transfer of balance to OREO and other
(2,256
)
 
(812
)
 
(106
)
 
(3,998
)
 
(7,172
)
Charge-offs
(1,611
)
 
(29,578
)
 
(334
)
 
(14,024
)
 
(45,547
)
Recoveries
2,301

 
6,704

 
121

 
3,801

 
12,927

Allowance for loan and lease losses at end of period
$
51,806

 
$
54,096

 
$
12,998

 
$
21,671

 
$
140,571

 
 
 
 
 
 
 
 
 
 
Reserve for unfunded commitments at beginning of period
$
4,531

 
$
5,309

 
$
555

 
$
2,813

 
$
13,208

Balance created in acquisition accounting
118

 
40

 
551

 
—

 
709

Provision for (Reversal of) unfunded commitments
220

 
849

 
(240
)
 
84

 
913

Reserve for unfunded commitments at end of period
$
4,869

 
$
6,198

 
$
866

 
$
2,897

 
$
14,830

 
 
 
 
 
 
 
 
 
 
Allowance on loans individually evaluated for impairment
$
636

 
$
12,646

 
$
145

 
$
2,915

 
$
16,342

Allowance on loans collectively evaluated for impairment
45,651

 
39,949

 
6,961

 
18,705

 
111,266

Allowance on loans acquired with deteriorated credit quality
5,519

 
1,501

 
5,892

 
51

 
12,963

 
 
 
 
 
 
 
 
 
 
Loans and leases, net of unearned income:
 
 
 
 
 
 
 
 
 
Balance at end of period
$
9,388,305

 
$
5,737,017

 
$
4,359,156

 
$
3,035,337

 
$
22,519,815

Balance at end of period individually evaluated for impairment
53,905

 
71,801

 
6,579

 
37,440

 
169,725

Balance at end of period collectively evaluated for impairment
9,166,070

 
5,638,375

 
4,259,369

 
2,922,863

 
21,986,677

Balance at end of period acquired with deteriorated credit quality
168,330

 
26,841

 
93,208

 
75,034

 
363,413


 
2017
(Dollars in thousands)
Commercial
Real Estate
 
Commercial
and Industrial
 
Residential
Mortgage
 
Consumer
 
Total
Allowance for loan and lease losses at beginning of period
$
49,231

 
$
60,939

 
$
11,249

 
$
23,300

 
$
144,719

Provision for (Reversal of) loan and lease losses
10,433

 
31,891

 
(2,206
)
 
10,993

 
51,111

Transfer of balance to OREO and other
853

 
(68
)
 
2

 
147

 
934

Charge-offs
(7,433
)
 
(40,015
)
 
(365
)
 
(14,653
)
 
(62,466
)
Recoveries
1,117

 
1,169

 
437

 
3,870

 
6,593

Allowance for loan and lease losses at end of period
$
54,201

 
$
53,916

 
$
9,117

 
$
23,657

 
$
140,891

 
 
 
 
 
 
 
 
 
 
Reserve for unfunded commitments at beginning of period
$
3,207

 
$
4,537

 
$
657

 
$
2,840

 
$
11,241

Balance created in acquisition accounting
253

 
783

 
327

 
7

 
1,370

Provision for (Reversal of) unfunded commitments
1,071

 
(11
)
 
(429
)
 
(34
)
 
597

Reserve for unfunded commitments at end of period
$
4,531

 
$
5,309

 
$
555

 
$
2,813

 
$
13,208

 
 
 
 
 
 
 
 
 
 
Allowance on loans individually evaluated for impairment
$
1,588

 
$
12,736

 
$
172

 
$
2,856

 
$
17,352

Allowance on loans collectively evaluated for impairment
30,360

 
38,944

 
3,141

 
17,210

 
89,655

Allowance on loans acquired with deteriorated credit quality
22,253

 
2,236

 
5,804

 
3,591

 
33,884

 
 
 
 
 
 
 
 
 
 
Loans and leases, net of unearned income:
 
 
 
 
 
 
 
 
 
Balance at end of period
$
8,938,230

 
$
5,135,067

 
$
3,056,352

 
$
2,948,532

 
$
20,078,181

Balance at end of period individually evaluated for impairment
91,785

 
102,416

 
6,749

 
37,177

 
238,127

Balance at end of period collectively evaluated for impairment
8,616,924

 
5,001,505

 
2,911,222

 
2,828,848

 
19,358,499

Balance at end of period acquired with deteriorated credit quality
229,521

 
31,146

 
138,381

 
82,507

 
481,555


 
2016
(Dollars in thousands)
Commercial
Real Estate
 
Commercial
and Industrial
 
Residential
Mortgage
 
Consumer
 
Total
Allowance for loan and lease losses at beginning of period
$
51,372

 
$
49,355

 
$
11,789

 
$
25,862

 
$
138,378

Provision for loan and lease losses
1,958

 
32,296

 
824

 
9,346

 
44,424

Decrease in FDIC loss share receivable
(34
)
 
(50
)
 
(1,090
)
 
(323
)
 
(1,497
)
Transfer of balance to OREO and other
(868
)
 
(519
)
 
(141
)
 
(1,253
)
 
(2,781
)
Charge-offs
(4,338
)
 
(21,645
)
 
(313
)
 
(13,543
)
 
(39,839
)
Recoveries
1,141

 
1,502

 
180

 
3,211

 
6,034

Allowance for loan and lease losses at end of period
$
49,231

 
$
60,939

 
$
11,249

 
$
23,300

 
$
144,719

 
 
 
 
 
 
 
 
 
 
Reserve for unfunded commitments at beginning of period
$
4,167

 
$
6,106

 
$
830

 
$
3,042

 
$
14,145

Reversal of provision for unfunded commitments
(960
)
 
(1,569
)
 
(173
)
 
(202
)
 
(2,904
)
Reserve for unfunded commitments at end of period
$
3,207

 
$
4,537

 
$
657

 
$
2,840

 
$
11,241

 
 
 
 
 
 
 
 
 
 
Allowance on loans individually evaluated for impairment
$
1,378

 
$
21,413

 
$
144

 
$
1,358

 
$
24,293

Allowance on loans collectively evaluated for impairment
25,248

 
37,206

 
4,223

 
17,537

 
84,214

Allowance on loans acquired with deteriorated credit quality
22,605

 
2,320

 
6,882

 
4,405

 
36,212

 
 
 
 
 
 
 
 
 
 
Loans and leases, net of unearned income:
 
 
 
 
 
 
 
 
 
Balance at end of period
$
6,846,549

 
$
4,060,032

 
$
1,267,400

 
$
2,890,990

 
$
15,064,971

Balance at end of period individually evaluated for impairment
61,006

 
220,995

 
4,312

 
16,467

 
302,780

Balance at end of period collectively evaluated for impairment
6,504,875

 
3,806,305

 
1,140,136

 
2,780,689

 
14,232,005

Balance at end of period acquired with deteriorated credit quality
280,668

 
32,732

 
122,952

 
93,834

 
530,186
Investment in Legacy and Acquired Loans by Credit Quality Indicator
The Company’s investment in loans by credit quality indicator is presented in the following tables. Asset risk classifications for commercial loans reflect the classification as of December 31, 2018 and 2017, respectively. Credit quality information in the tables below includes total loans acquired (including acquired impaired loans) at the net loan balance, after the application of premiums/discounts, at December 31, 2018 and 2017. Loan premiums/discounts represent the adjustment of acquired loans to fair value at the acquisition date, as adjusted for income accretion and changes in cash flow estimates in subsequent periods.
Loan delinquency is the primary credit quality indicator that the Company utilizes to monitor consumer asset quality.
 
December 31, 2018
 
December 31, 2017
(Dollars in thousands)
Pass
 
Special Mention
 
Sub-
standard
 
Doubtful
 
Total
 
Pass
 
Special Mention
 
Sub-
standard
 
Doubtful
 
Loss
 
Total
Commercial real estate - construction
$
1,182,554

 
$
1,062

 
$
12,740

 
$
10

 
$
1,196,366

 
$
1,189,490

 
$
20,351

 
$
30,541

 
$
14

 
$
—

 
$
1,240,396

Commercial real estate - owner-occupied
2,328,999

 
25,526

 
41,297

 
—

 
2,395,822

 
2,234,151

 
82,114

 
56,590

 
2,466

 
—

 
2,375,321

Commercial real estate - non-owner-occupied
5,687,963

 
78,009

 
26,512

 
3,633

 
5,796,117

 
5,258,638

 
19,311

 
42,702

 
1,744

 
118

 
5,322,513

Commercial and industrial
5,586,482

 
52,632

 
73,853

 
24,050

 
5,737,017

 
4,882,554

 
88,149

 
128,961

 
35,403

 
—

 
5,135,067

Total
$
14,785,998

 
$
157,229

 
$
154,402

 
$
27,693

 
$
15,125,322

 
$
13,564,833

 
$
209,925

 
$
258,794

 
$
39,627

 
$
118

 
$
14,073,297


 
December 31, 2018
 
December 31, 2017
(Dollars in thousands)
Current
 
30+ Days Past Due
 
Total
 
Current
 
30+ Days Past Due
 
Total
Residential mortgage
$
4,290,152

 
$
69,004

 
$
4,359,156

 
$
2,962,043

 
$
94,309

 
$
3,056,352

Consumer - home equity
2,258,659

 
46,035

 
2,304,694

 
2,250,205

 
42,070

 
2,292,275

Consumer - other
721,231

 
9,412

 
730,643

 
645,498

 
10,759

 
656,257

Total
$
7,270,042

 
$
124,451

 
$
7,394,493

 
$
5,857,746

 
$
147,138

 
$
6,004,884
Schedule of Investment in Legacy Impaired Loans
Information on the Company’s investment in impaired loans, which include all TDRs and all other non-accrual loans evaluated or measured individually for impairment for purposes of determining the ALLL, is presented in the following tables as of and for the periods indicated.
 
December 31, 2018
(Dollars in thousands)
Unpaid Principal Balance
 
Recorded Investment
 
Related
Allowance
 
Average
Recorded
Investment
 
Interest
Income
Recognized
With no related allowance recorded:
 
 
 
 
 
 
 
 
 
Commercial real estate - construction
$
10,261

 
$
9,262

 
$
—

 
$
9,189

 
$
496

Commercial real estate - owner-occupied
25,037

 
19,044

 
—

 
19,559

 
807

Commercial real estate - non-owner-occupied
15,265

 
14,288

 
—

 
14,873

 
590

Commercial and industrial
55,554

 
43,886

 
—

 
47,268

 
2,422

Residential mortgage
1,244

 
1,221

 
—

 
1,261

 
46

Consumer - home equity
4,183

 
4,176

 
—

 
2,867

 
39

 
 
 
 
 
 
 
 
 
 
With an allowance recorded:
 
 
 
 
 
 
 
 
 
Commercial real estate - construction
228

 
140

 
(11
)
 
148

 
1

Commercial real estate - owner-occupied
5,032

 
4,773

 
(520
)
 
4,976

 
196

Commercial real estate - non-owner-occupied
6,445

 
6,398

 
(105
)
 
6,229

 
294

Commercial and industrial
46,387

 
27,915

 
(12,646
)
 
40,653

 
795

Residential mortgage
5,870

 
5,358

 
(145
)
 
5,494

 
225

Consumer - home equity
29,284

 
28,818

 
(2,427
)
 
27,911

 
1,202

Consumer - other
4,956

 
4,446

 
(488
)
 
4,822

 
273

Total
$
209,746

 
$
169,725

 
$
(16,342
)
 
$
185,250

 
$
7,386

Total commercial loans and leases
$
164,209

 
$
125,706

 
$
(13,282
)
 
$
142,895

 
$
5,601

Total mortgage loans
7,114

 
6,579

 
(145
)
 
6,755

 
271

Total consumer loans
38,423

 
37,440

 
(2,915
)
 
35,600

 
1,514

 
December 31, 2017
(Dollars in thousands)
Unpaid Principal Balance
 
Recorded Investment
 
Related
Allowance
 
Average
Recorded
Investment
 
Interest
Income
Recognized
With no related allowance recorded:
 
 
 
 
 
 
 
 
 
Commercial real estate - construction
$
13,763

 
$
13,013

 
$
—

 
$
9,104

 
$
441

Commercial real estate - owner-occupied
50,867

 
44,482

 
—

 
53,282

 
1,389

Commercial real estate - non-owner-occupied
15,370

 
14,975

 
—

 
15,127

 
692

Commercial and industrial
103,013

 
70,254

 
—

 
92,312

 
2,279

Residential mortgage
2,004

 
2,001

 
—

 
2,044

 
85

Consumer - home equity
5,906

 
5,634

 
—

 
5,747

 
231

Consumer - other
75

 
75

 
—

 
11

 
1

 
 
 
 
 
 
 
 
 
 
With an allowance recorded:
 
 
 
 
 
 
 
 
 
Commercial real estate - construction
238

 
156

 
(19
)
 
197

 
6

Commercial real estate - owner-occupied
13,314

 
13,287

 
(949
)
 
13,498

 
414

Commercial real estate - non-owner-occupied
6,051

 
5,872

 
(620
)
 
6,196

 
154

Commercial and industrial
35,306

 
32,162

 
(12,736
)
 
42,874

 
1,220

Residential mortgage
5,179

 
4,748

 
(172
)
 
4,861

 
180

Consumer - home equity
27,189

 
26,575

 
(2,358
)
 
23,546

 
1,007

Consumer - other
5,354

 
4,893

 
(498
)
 
4,455

 
269

Total
$
283,629

 
$
238,127

 
$
(17,352
)
 
$
273,254

 
$
8,368

Total commercial loans and leases
$
237,922

 
$
194,201

 
$
(14,324
)
 
$
232,590

 
$
6,595

Total mortgage loans
7,183

 
6,749

 
(172
)
 
6,905

 
265

Total consumer loans
38,524

 
37,177

 
(2,856
)
 
33,759

 
1,508

 
December 31, 2016
(Dollars in thousands)
Unpaid Principal Balance
 
Recorded Investment
 
Related
Allowance
 
Average
Recorded
Investment
 
Interest
Income
Recognized
With no related allowance recorded:
 
 
 
 
 
 
 
 
 
Commercial real estate - construction
$
38

 
$
38

 
$
—

 
$
28

 
$
—

Commercial real estate - owner-occupied
25,180

 
25,074

 
—

 
25,890

 
647

Commercial real estate - non-owner-occupied
15,654

 
14,794

 
—

 
19,587

 
879

Commercial and industrial
148,311

 
138,202

 
—

 
111,261

 
3,418

 
 
 
 
 
 
 
 
 
 
With an allowance recorded:
 
 
 
 
 
 
 
 
 
Commercial real estate - construction
1,946

 
1,946

 
(649
)
 
1,839

 
54

Commercial real estate - owner-occupied
17,580

 
17,429

 
(640
)
 
16,668

 
493

Commercial real estate - non-owner-occupied
1,743

 
1,725

 
(89
)
 
1,782

 
95

Commercial and industrial
84,197

 
82,793

 
(21,413
)
 
78,270

 
2,858

Residential mortgage
4,628

 
4,312

 
(144
)
 
4,377

 
161

Consumer - home equity
13,916

 
13,267

 
(993
)
 
10,237

 
435

Consumer - other
3,485

 
3,200

 
(365
)
 
2,425

 
151

Total
$
316,678

 
$
302,780

 
$
(24,293
)
 
$
272,364

 
$
9,191

Total commercial loans and leases
$
294,649

 
$
282,001

 
$
(22,791
)
 
$
255,325

 
$
8,444

Total mortgage loans
4,628

 
4,312

 
(144
)
 
4,377

 
161

Total consumer loans
17,401

 
16,467

 
(1,358
)
 
12,662

 
586