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Loans (Tables)
 12 Months Ended
Dec. 31, 2016
Receivables [Abstract]  
Schedule of Loan Portfolio Non-Covered and Covered PCI Loans and Non-PCI Loans
The detail of the loan portfolio as of December 31, 2016 and 2015 was as follows: 
 
December 31, 2016
 
December 31, 2015
 
Non-PCI
Loans
 
PCI
Loans*
 
Total
 
Non-PCI
Loans
 
PCI
Loans*
 
Total
 
(in thousands)
Loans:
 
 
 
 
 
 
 
 
 
 
 
Commercial and industrial
$
2,357,018

 
$
281,177

 
$
2,638,195

 
$
2,156,549

 
$
383,942

 
$
2,540,491

Commercial real estate:
 
 
 
 
 
 
 
 
 
 
 
Commercial real estate
7,628,328

 
1,091,339

 
8,719,667

 
6,069,532

 
1,355,104

 
7,424,636

Construction
710,266

 
114,680

 
824,946

 
607,694

 
147,253

 
754,947

Total commercial real estate loans
8,338,594

 
1,206,019

 
9,544,613

 
6,677,226

 
1,502,357

 
8,179,583

Residential mortgage
2,684,195

 
183,723

 
2,867,918

 
2,912,079

 
218,462

 
3,130,541

Consumer:
 
 
 
 
 
 
 
 
 
 
 
Home equity
376,213

 
92,796

 
469,009

 
391,809

 
119,394

 
511,203

Automobile
1,139,082

 
145

 
1,139,227

 
1,238,826

 
487

 
1,239,313

Other consumer
569,499

 
7,642

 
577,141

 
426,147

 
15,829

 
441,976

Total consumer loans
2,084,794

 
100,583

 
2,185,377

 
2,056,782

 
135,710

 
2,192,492

Total loans
$
15,464,601

 
$
1,771,502

 
$
17,236,103

 
$
13,802,636

 
$
2,240,471

 
$
16,043,107


 
*
PCI loans include covered loans (mostly consisting of residential mortgage and commercial real estate loans) totaling $70.4 million and $122.3 million at December 31, 2016 and 2015, respectively.
Changes in Accretable Yield for Covered Loans
The following table presents changes in the accretable yield for PCI loans for the years ended December 31, 2016 and 2015:
 
2016
 
2015
 
(in thousands)
Balance, beginning of period
$
415,179

 
$
336,208

Acquisition
—

 
126,930

Accretion
(107,482
)
 
(105,078
)
Net (decrease) increase in expected cash flows
(9,989
)
 
57,119

Other, net
(3,194
)
 
—

Balance, end of period
$
294,514

 
$
415,179
Summary of Related Party Loans
The following table summarizes the changes in the total amounts of loans and advances to the related parties during the year ended December 31, 2016: 
 
2016
 
(in thousands)
Outstanding at beginning of year
$
191,566

New loans and advances
26,736

Repayments
(52,982
)
Outstanding at end of year
$
165,320
Past Due, Non-Accrual and Current Non-Covered Loans by Loan Portfolio Class
The following tables present past due, non-accrual and current loans (excluding PCI loans, which are accounted for on a pool basis) by loan portfolio class at December 31, 2016 and 2015:
 
 
Past Due and Non-Accrual Loans
 
 
 
 
 
30-59 Days
Past Due
Loans
 
60-89 Days
Past Due
Loans
 
Accruing  Loans
90 Days Or More
Past Due
 
Non-Accrual
Loans
 
Total
Past Due
Loans
 
Current
Non-PCI
Loans
 
Total
Non-PCI
Loans
 
(in thousands)
December 31, 2016
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial and industrial
$
6,705

 
$
5,010

 
$
142

 
$
8,465

 
$
20,322

 
$
2,336,696

 
$
2,357,018

Commercial real estate:
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial real estate
5,894

 
8,642

 
474

 
15,079

 
30,089

 
7,598,239

 
7,628,328

Construction
6,077

 
—

 
1,106

 
715

 
7,898

 
702,368

 
710,266

Total commercial real estate loans
11,971

 
8,642

 
1,580

 
15,794

 
37,987

 
8,300,607

 
8,338,594

Residential mortgage
12,005

 
3,564

 
1,541

 
12,075

 
29,185

 
2,655,010

 
2,684,195

Consumer loans:
 
 
 
 
 
 
 
 
 
 
 
 
 
Home equity
929

 
415

 
—

 
1,028

 
2,372

 
373,841

 
376,213

Automobile
3,192

 
723

 
188

 
146

 
4,249

 
1,134,833

 
1,139,082

Other consumer
76

 
9

 
21

 
—

 
106

 
569,393

 
569,499

Total consumer loans
4,197

 
1,147

 
209

 
1,174

 
6,727

 
2,078,067

 
2,084,794

Total
$
34,878

 
$
18,363

 
$
3,472

 
$
37,508

 
$
94,221

 
$
15,370,380

 
$
15,464,601

 
Past Due and Non-Accrual Loans
 
 
 
 
 
30-59 Days
Past Due
Loans
 
60-89 Days
Past Due
Loans
 
Accruing  Loans
90 Days Or More
Past Due
 
Non-Accrual
Loans
 
Total
Past Due
Loans
 
Current
Non-PCI
Loans
 
Total
Non-PCI
Loans
 
(in thousands)
December 31, 2015
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial and industrial
$
3,920

 
$
524

 
$
213

 
$
10,913

 
$
15,570

 
$
2,140,979

 
$
2,156,549

Commercial real estate:
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial real estate
2,684

 
—

 
131

 
24,888

 
27,703

 
6,041,829

 
6,069,532

Construction
1,876

 
2,799

 
—

 
6,163

 
10,838

 
596,856

 
607,694

Total commercial real estate loans
4,560

 
2,799

 
131

 
31,051

 
38,541

 
6,638,685

 
6,677,226

Residential mortgage
6,681

 
1,626

 
1,504

 
17,930

 
27,741

 
2,884,338

 
2,912,079

Consumer loans:
 
 
 
 
 
 
 
 
 
 
 
 
 
Home equity
1,308

 
111

 
—

 
2,088

 
3,507

 
388,302

 
391,809

Automobile
1,969

 
491

 
164

 
118

 
2,742

 
1,236,084

 
1,238,826

Other consumer
71

 
24

 
44

 
—

 
139

 
426,008

 
426,147

Total consumer loans
3,348

 
626

 
208

 
2,206

 
6,388

 
2,050,394

 
2,056,782

Total
$
18,509

 
$
5,575

 
$
2,056

 
$
62,100

 
$
88,240

 
$
13,714,396

 
$
13,802,636
Impaired Loans
The following table presents the information about impaired loans by loan portfolio class at December 31, 2016 and 2015:
 
 
Recorded
Investment
With No
Related
Allowance
 
Recorded
Investment
With
Related
Allowance
 
Total
Recorded
Investment
 
Unpaid
Contractual
Principal
Balance
 
Related
Allowance
 
(in thousands)
December 31, 2016
 
 
 
 
 
 
 
 
 
Commercial and industrial
$
3,609

 
$
27,031

 
$
30,640

 
$
35,957

 
$
5,864

Commercial real estate:
 
 
 
 
 
 
 
 
 
Commercial real estate
21,318

 
36,974

 
58,292

 
60,267

 
3,612

Construction
1,618

 
2,379

 
3,997

 
3,997

 
260

Total commercial real estate loans
22,936

 
39,353

 
62,289

 
64,264

 
3,872

Residential mortgage
8,398

 
9,958

 
18,356

 
19,712

 
725

Consumer loans:
 
 
 
 
 
 
 
 
 
Home equity
1,182

 
2,352

 
3,534

 
3,626

 
70

Total consumer loans
1,182

 
2,352

 
3,534

 
3,626

 
70

Total
$
36,125

 
$
78,694

 
$
114,819

 
$
123,559

 
$
10,531

December 31, 2015
 
 
 
 
 
 
 
 
 
Commercial and industrial
$
7,863

 
$
17,851

 
$
25,714

 
$
33,071

 
$
3,439

Commercial real estate:
 
 
 
 
 
 
 
 
 
Commercial real estate
30,113

 
37,440

 
67,553

 
71,263

 
3,354

Construction
8,847

 
5,530

 
14,377

 
14,387

 
317

Total commercial real estate loans
38,960

 
42,970

 
81,930

 
85,650

 
3,671

Residential mortgage
7,842

 
14,770

 
22,612

 
24,528

 
1,377

Consumer loans:
 
 
 
 
 
 
 
 
 
Home equity
263

 
1,869

 
2,132

 
2,224

 
295

Total consumer loans
263

 
1,869

 
2,132

 
2,224

 
295

Total
$
54,928

 
$
77,460

 
$
132,388

 
$
145,473

 
$
8,782
Average Recorded Investment and Interest Income Recognized on Impaired Loans
The following table presents, by loan portfolio class, the average recorded investment and interest income recognized on impaired loans for the years ended December 31, 2016, 2015 and 2014:
 
 
2016
 
2015
 
2014
 
Average
Recorded
Investment
 
Interest
Income
Recognized
 
Average
Recorded
Investment
 
Interest
Income
Recognized
 
Average
Recorded
Investment
 
Interest
Income
Recognized
 
(in thousands)
Commercial and industrial
$
36,552

 
$
1,045

 
$
28,451

 
$
893

 
$
30,485

 
$
1,114

Commercial real estate:
 
 
 
 
 
 
 
 
 
 
 
Commercial real estate
59,633

 
2,122

 
77,154

 
2,380

 
74,256

 
2,488

Construction
5,790

 
182

 
16,399

 
534

 
21,515

 
547

Total commercial real estate loans
65,423

 
2,304

 
93,553

 
2,914

 
95,771

 
3,035

Residential mortgage
21,340

 
874

 
24,435

 
728

 
26,863

 
812

Consumer loans:
 
 
 
 
 
 
 
 
 
 
 
Home equity
2,626

 
68

 
3,852

 
111

 
2,214

 
49

Total consumer loans
2,626

 
68

 
3,852

 
111

 
2,214

 
49

Total
$
125,941

 
$
4,291

 
$
150,291

 
$
4,646

 
$
155,333

 
$
5,010
Pre-Modification and Post-Modification Outstanding Recorded Investments
The non-PCI loans modified as TDRs within the previous 12 months and for which there was a payment default (90 or more days past due) for the years ended December 31, 2016 and 2015 were as follows:
 
Years Ended December 31,
 
2016
 
2015
Troubled Debt Restructurings Subsequently Defaulted
Number of
Contracts
 
Recorded
Investment
 
Number of
Contracts
 
Recorded
Investment
 
($ in thousands)
Commercial and industrial
—

 
$
—

 
1

 
$
129

Commercial real estate
2

 
357

 
1

 
87

Residential mortgage
4

 
853

 
1

 
214

Consumer
—

 
—

 
1

 
75

Total
6

 
$
1,210

 
4

 
$
505

The following table presents non-PCI loans by loan class modified as TDRs during the years ended December 31, 2016 and 2015. The pre-modification and post-modification outstanding recorded investments disclosed in the table below represent the loan carrying amounts immediately prior to the modification and the carrying amounts at December 31, 2016 and 2015, respectively.
Troubled Debt
Restructurings
 
Number of
 Contracts
 
Pre-Modification
Outstanding
Recorded Investment
 
Post-Modification
Outstanding
Recorded Investment
 
 
 
 
($ in thousands)
December 31, 2016
 
 
 
 
 
 
Commercial and industrial
 
19

 
$
18,186

 
$
16,277

Commercial real estate:
 
 
 
 
 
 
Commercial real estate
 
4

 
8,325

 
7,092

Construction
 
3

 
2,922

 
3,626

Total commercial real estate
 
7

 
11,247

 
10,718

Residential mortgage
 
7

 
1,867

 
1,826

Consumer
 
1

 
54

 
51

Total
 
34

 
$
31,354

 
$
28,872

December 31, 2015
 
 
 
 
 
 
Commercial and industrial
 
17

 
$
8,409

 
$
6,793

Commercial real estate:
 
 
 
 
 
 
Commercial real estate
 
5

 
6,768

 
6,709

Construction
 
2

 
646

 
1,391

Total commercial real estate
 
7

 
7,414

 
8,100

Residential mortgage
 
7

 
2,659

 
2,603

Consumer
 
2

 
1,111

 
1,095

Total
 
33

 
$
19,593

 
$
18,591
Risk Category of Loans
The following table presents the risk category of loans by class of loans (excluding PCI loans) based on the most recent analysis performed at December 31, 2016 and 2015. 
Credit exposure—
by internally assigned risk rating
 
 
 
Special
 
 
 
 
 
Total Non-PCI
 
Pass
 
Mention
 
Substandard
 
Doubtful
 
Loans
 
 
(in thousands)
December 31, 2016
 
 
 
 
 
 
 
 
 
 
Commercial and industrial
 
$
2,246,457

 
$
44,316

 
$
64,649

 
$
1,596

 
$
2,357,018

Commercial real estate
 
7,486,469

 
57,591

 
84,268

 
—

 
7,628,328

Construction
 
708,070

 
200

 
1,996

 
—

 
710,266

Total
 
$
10,440,996

 
$
102,107

 
$
150,913

 
$
1,596

 
$
10,695,612

December 31, 2015
 
 
 
 
 
 
 
 
 
 
Commercial and industrial
 
$
2,049,752

 
$
68,243

 
$
36,254

 
$
2,300

 
$
2,156,549

Commercial real estate
 
5,893,354

 
79,279

 
96,899

 
—

 
6,069,532

Construction
 
596,530

 
1,102

 
10,062

 
—

 
607,694

Total
 
$
8,539,636

 
$
148,624

 
$
143,215

 
$
2,300

 
$
8,833,775
Recorded Investment in Loan Classes Based on Payment Activity
The following table presents the recorded investment in those loan classes based on payment activity as of December 31, 2016 and 2015:
 
Credit exposure—
by payment activity
 
Performing
Loans
 
Non-Performing
Loans
 
Total Non-PCI
Loans
 
 
(in thousands)
December 31, 2016
 
 
 
 
 
 
Residential mortgage
 
$
2,672,120

 
$
12,075

 
$
2,684,195

Home equity
 
375,185

 
1,028

 
376,213

Automobile
 
1,138,936

 
146

 
1,139,082

Other consumer
 
569,499

 
—

 
569,499

Total
 
$
4,755,740

 
$
13,249

 
$
4,768,989

December 31, 2015
 
 
 
 
 
 
Residential mortgage
 
$
2,894,149

 
$
17,930

 
$
2,912,079

Home equity
 
389,721

 
2,088

 
391,809

Automobile
 
1,238,708

 
118

 
1,238,826

Other consumer
 
426,147

 
—

 
426,147

Total
 
$
4,948,725

 
$
20,136

 
$
4,968,861

The following table presents the recorded investment in PCI loans by class based on individual loan payment activity as of December 31, 2016 and 2015: 

Credit exposure—
 
Performing
 
Non-Performing
 
Total
by payment activity
 
Loans
 
Loans
 
PCI Loans
 
 
(in thousands)
December 31, 2016
 
 
 
 
 
 
Commercial and industrial
 
$
272,483

 
$
8,694

 
$
281,177

Commercial real estate
 
1,080,376

 
10,963

 
1,091,339

Construction
 
113,370

 
1,310

 
114,680

Residential mortgage
 
179,793

 
3,930

 
183,723

Consumer
 
98,469

 
2,114

 
100,583

Total
 
$
1,744,491

 
$
27,011

 
$
1,771,502

December 31, 2015
 
 
 
 
 
 
Commercial and industrial
 
$
373,665

 
$
10,277

 
$
383,942

Commercial real estate
 
1,342,030

 
13,074

 
1,355,104

Construction
 
141,547

 
5,706

 
147,253

Residential mortgage
 
214,713

 
3,749

 
218,462

Consumer
 
129,891

 
5,819

 
135,710

Total
 
$
2,201,846

 
$
38,625

 
$
2,240,471