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Allowance for Credit Losses and Credit Quality (Tables)
 12 Months Ended
Dec. 31, 2017
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)
2017
 
2016
 
2015
Allowance for credit losses
 
 
 
 
 
Allowance for loan losses at beginning of period
$
144,719

 
$
138,378

 
$
130,131

Provision for loan losses before adjustment attributable to FDIC loss share agreements
51,111

 
42,927

 
29,548

Adjustment attributable to FDIC loss share arrangements
—

 
1,497

 
1,360

Net provision for loan losses
51,111

 
44,424

 
30,908

Adjustment attributable to FDIC loss share arrangements
—

 
(1,497
)
 
(1,360
)
Transfer of balance to OREO and other
934

 
(2,781
)
 
(10,419
)
Loans charged-off
(62,466
)
 
(39,839
)
 
(17,301
)
Recoveries
6,593

 
6,034

 
6,419

Allowance for loan losses at end of period
$
140,891

 
$
144,719

 
$
138,378

 
 
 
 
 
 
Reserve for unfunded commitments at beginning of period
$
11,241

 
$
14,145

 
$
11,801

Balance created in acquisition accounting
1,370

 
—

 
—

Provision for (Reversal of) unfunded lending commitments
597

 
(2,904
)
 
2,344

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

 
$
11,241

 
$
14,145

Allowance for credit losses at end of period
$
154,099

 
$
155,960

 
$
152,523

A summary of changes in the allowance for credit losses, by loan portfolio type, for the years ended December 31 is as follows:
 
2017
(Dollars in thousands)
Commercial
Real Estate
 
Commercial
and Industrial
 
Residential
Mortgage
 
Consumer
 
Total
Allowance for loan losses at beginning of period
$
49,231

 
$
60,939

 
$
11,249

 
$
23,300

 
$
144,719

Provision for (Reversal of) loan losses
10,433

 
31,891

 
(2,206
)
 
10,993

 
51,111

Transfer of balance to OREO and other
853

 
(68
)
 
2

 
147

 
934

Loans charged off
(7,433
)
 
(40,015
)
 
(365
)
 
(14,653
)
 
(62,466
)
Recoveries
1,117

 
1,169

 
437

 
3,870

 
6,593

Allowance for loan 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, 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 losses at beginning of period
$
51,372

 
$
49,355

 
$
11,789

 
$
25,862

 
$
138,378

Provision for loan 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
)
Loans charged off
(4,338
)
 
(21,645
)
 
(313
)
 
(13,543
)
 
(39,839
)
Recoveries
1,141

 
1,502

 
180

 
3,211

 
6,034

Allowance for loan 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, 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

 
2015
(Dollars in thousands)
Commercial
Real Estate
 
Commercial
and Industrial
 
Residential
Mortgage
 
Consumer
 
Total
Allowance for loan losses at beginning of period
$
57,093

 
$
33,328

 
$
9,162

 
$
30,548

 
$
130,131

Provision for loan losses
1,059

 
17,423

 
3,620

 
8,806

 
30,908

Increase (Decrease) in FDIC loss share receivable
757

 
(49
)
 
(235
)
 
(1,833
)
 
(1,360
)
Transfer of balance to OREO and other
(6,849
)
 
(275
)
 
(491
)
 
(2,804
)
 
(10,419
)
Loans charged off
(2,806
)
 
(1,279
)
 
(362
)
 
(12,854
)
 
(17,301
)
Recoveries
2,118

 
207

 
95

 
3,999

 
6,419

Allowance for loan losses at end of period
$
51,372

 
$
49,355

 
$
11,789

 
$
25,862

 
$
138,378

 
 
 
 
 
 
 
 
 
 
Reserve for unfunded commitments at beginning of period
$
3,439

 
$
5,260

 
$
168

 
$
2,934

 
$
11,801

Provision for unfunded commitments
728

 
846

 
662

 
108

 
2,344

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

 
$
6,106

 
$
830

 
$
3,042

 
$
14,145

 
 
 
 
 
 
 
 
 
 
Allowance on loans individually evaluated for impairment
$
1,287

 
$
2,394

 
$
1

 
$
397

 
$
4,079

Allowance on loans collectively evaluated for impairment
24,186

 
44,080

 
4,150

 
17,839

 
90,255

Allowance on loans acquired with deteriorated credit quality
25,899

 
2,881

 
7,638

 
7,626

 
44,044

 
 
 
 
 
 
 
 
 
 
Loans, net of unearned income:
 
 
 
 
 
 
 
 
 
Balance at end of period
$
6,125,927

 
$
4,072,928

 
$
1,195,319

 
$
2,933,254

 
$
14,327,428

Balance at end of period individually evaluated for impairment
29,578

 
33,270

 
70

 
5,066

 
67,984

Balance at end of period collectively evaluated for impairment
5,685,272

 
3,987,665

 
1,054,669

 
2,807,119

 
13,534,725

Balance at end of period acquired with deteriorated credit quality
411,077

 
51,993

 
140,580

 
121,069

 
724,719
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, 2017 and 2016, 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, 2017 and 2016. 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, 2017
 
December 31, 2016
(Dollars in thousands)
Pass
 
Special Mention
 
Sub-
standard
 
Doubtful
 
Loss
 
Total
 
Pass
 
Special Mention
 
Sub-
standard
 
Doubtful
 
Loss
 
Total
Commercial real estate - construction
$
1,189,490

 
$
20,351

 
$
30,541

 
$
14

 
$
—

 
$
1,240,396

 
$
775,387

 
$
2,694

 
$
22,026

 
$
2,135

 
$
—

 
$
802,242

Commercial real estate - owner-occupied
2,388,715

 
82,114

 
56,590

 
2,466

 
—

 
2,529,885

 
2,180,201

 
29,039

 
66,816

 
1,670

 
23

 
2,277,749

Commercial real estate - non-owner-occupied
5,104,074

 
19,311

 
42,702

 
1,744

 
118

 
5,167,949

 
3,687,439

 
23,004

 
55,576

 
539

 
—

 
3,766,558

Commercial and industrial
4,882,554

 
88,149

 
128,961

 
35,403

 
—

 
5,135,067

 
3,660,080

 
104,482

 
266,553

 
28,917

 
—

 
4,060,032

Total
$
13,564,833

 
$
209,925

 
$
258,794

 
$
39,627

 
$
118

 
$
14,073,297

 
$
10,303,107

 
$
159,219

 
$
410,971

 
$
33,261

 
$
23

 
$
10,906,581

 

 
December 31, 2017
 
December 31, 2016
(Dollars in thousands)
Current
 
30+ Days Past Due
 
Total
 
Current
 
30+ Days Past Due
 
Total
Residential mortgage
$
2,962,043

 
$
94,309

 
$
3,056,352

 
$
1,229,761

 
$
37,639

 
$
1,267,400

Consumer - home equity
2,250,205

 
42,070

 
2,292,275

 
2,129,110

 
26,816

 
2,155,926

Consumer - indirect automobile
59,836

 
2,857

 
62,693

 
127,047

 
4,005

 
131,052

Consumer - credit card
95,263

 
1,105

 
96,368

 
82,052

 
940

 
82,992

Consumer - other
490,399

 
6,797

 
497,196

 
515,857

 
5,163

 
521,020

Total
$
5,857,746

 
$
147,138

 
$
6,004,884

 
$
4,083,827

 
$
74,563

 
$
4,158,390
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 allowance for loan losses, is presented in the following tables as of and for the periods indicated. 
 
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 - indirect automobile
1,034

 
679

 
(79
)
 
873

 
38

Consumer - other
4,320

 
4,214

 
(419
)
 
3,582

 
231

Total
$
283,629

 
$
238,127

 
$
(17,352
)
 
$
273,254

 
$
8,368

Total commercial loans
$
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

Consumer - home equity
—

 
—

 
—

 
—

 
—

Consumer - other
—

 
—

 
—

 
—

 
—

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 - indirect automobile
1,037

 
758

 
(114
)
 
956

 
49

Consumer - other
2,448

 
2,442

 
(251
)
 
1,469

 
102

Total
$
316,678

 
$
302,780

 
$
(24,293
)
 
$
272,364

 
$
9,191

Total commercial loans
$
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

 
December 31, 2015
(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
$
54

 
$
51

 
$
—

 
$
55

 
$
1

Commercial real estate - owner-occupied
3,630

 
3,495

 
—

 
2,928

 
106

Commercial real estate - non-owner-occupied
13,318

 
12,600

 
—

 
12,881

 
209

Commercial and industrial
14,571

 
14,340

 
—

 
18,839

 
1,148

Consumer - home equity
730

 
730

 
—

 
533

 
22

Consumer - other
66

 
66

 
—

 
66

 
5

With an allowance recorded:
 
 
 
 
 
 
 
 
 
Commercial real estate - construction
3

 
3

 
(2
)
 
57

 
1

Commercial real estate - owner-occupied
12,744

 
12,691

 
(1,244
)
 
12,908

 
527

Commercial real estate - non-owner-occupied
738

 
738

 
(41
)
 
1,027

 
62

Commercial and industrial
18,958

 
18,930

 
(2,394
)
 
20,055

 
776

Residential mortgage
70

 
70

 
(1
)
 
70

 
5

Consumer - home equity
3,859

 
3,683

 
(338
)
 
2,454

 
73

Consumer - other
588

 
587

 
(59
)
 
488

 
3

Total
$
69,329

 
$
67,984

 
$
(4,079
)
 
$
72,361

 
$
2,938

Total commercial loans
$
64,016

 
$
62,848

 
$
(3,681
)
 
$
68,750

 
$
2,830

Total mortgage loans
70

 
70

 
(1
)
 
70

 
5

Total consumer loans
5,243

 
5,066

 
(397
)
 
3,541

 
103