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Loans (Tables)
 9 Months Ended
Sep. 30, 2014
Receivables [Abstract]  
Loans
Loans were as follows:
 
September 30,
2014
 
Percentage
of Total
 
December 31,
2013
 
Percentage
of Total
Commercial and industrial:
 
 
 
 
 
 
 
Commercial
$
5,188,609

 
48.3
 %
 
$
4,587,499

 
48.2
 %
Leases
322,278

 
3.0

 
319,577

 
3.4

Total commercial and industrial
5,510,887

 
51.3

 
4,907,076

 
51.6

Commercial real estate:
 
 
 
 
 
 
 
Commercial mortgages
3,077,172

 
28.6

 
2,800,760

 
29.4

Construction
642,992

 
6.0

 
426,639

 
4.5

Land
300,314

 
2.8

 
239,937

 
2.5

Total commercial real estate
4,020,478

 
37.4

 
3,467,336

 
36.4

Consumer real estate:
 
 
 
 
 
 
 
Home equity loans
337,879

 
3.1

 
329,853

 
3.5

Home equity lines of credit
216,281

 
2.0

 
195,132

 
2.1

1-4 family residential mortgages
28,416

 
0.3

 
32,447

 
0.3

Construction
17,080

 
0.2

 
13,123

 
0.1

Other
247,412

 
2.3

 
237,649

 
2.5

Total consumer real estate
847,068

 
7.9

 
808,204

 
8.5

Total real estate
4,867,546

 
45.3

 
4,275,540

 
44.9

Consumer and other:
 
 
 
 
 
 
 
Consumer installment
384,931

 
3.6

 
350,827

 
3.7

Other
6,567

 
—

 
7,289

 
0.1

Total consumer and other
391,498

 
3.6

 
358,116

 
3.8

Unearned discounts
(23,147
)
 
(0.2
)
 
(25,032
)
 
(0.3
)
Total loans
$
10,746,784

 
100.0
 %
 
$
9,515,700

 
100.0
 %
Non-Accrual Loans, Segregated by Class of Loans
Non-accrual loans, segregated by class of loans, were as follows:
 
September 30,
2014
 
December 31,
2013
Commercial and industrial:
 
 
 
Energy
$
638

 
$
590

Other commercial
33,331

 
26,143

Commercial real estate:
 
 
 
Buildings, land and other
20,390

 
27,035

Construction
289

 
—

Consumer real estate
1,973

 
2,207

Consumer and other
479

 
745

Total
$
57,100

 
$
56,720
Age Analysis of Past Due Loans, Segregated by Class of Loans
An age analysis of past due loans (including both accruing and non-accruing loans), segregated by class of loans, as of September 30, 2014 was as follows:
 
Loans
30-89 Days
Past Due
 
Loans
90 or More
Days
Past Due
 
Total
Past Due
Loans
 
Current
Loans
 
Total
Loans
 
Accruing
Loans 90 or
More Days
Past Due
Commercial and industrial:
 
 
 
 
 
 
 
 
 
 
 
Energy
$
4,689

 
$
—

 
$
4,689

 
$
1,595,777

 
$
1,600,466

 
$
—

Other commercial
27,801

 
14,772

 
42,573

 
3,867,848

 
3,910,421

 
10,740

Commercial real estate:
 
 
 
 
 
 
 
 
 
 
 
Buildings, land and other
19,129

 
16,855

 
35,984

 
3,341,502

 
3,377,486

 
7,216

Construction
7,111

 
—

 
7,111

 
635,881

 
642,992

 
1,503

Consumer real estate
3,777

 
1,727

 
5,504

 
841,564

 
847,068

 
828

Consumer and other
4,428

 
828

 
5,256

 
386,242

 
391,498

 
—

Unearned discounts
—

 
—

 
—

 
(23,147
)
 
(23,147
)
 
—

Total
$
66,935

 
$
34,182

 
$
101,117

 
$
10,645,667

 
$
10,746,784

 
$
20,287
Impaired Loans
Impaired loans are set forth in the following table. No interest income was recognized on impaired loans subsequent to their classification as impaired.
 
Unpaid Contractual
Principal
Balance
 
Recorded Investment
With No
Allowance
 
Recorded Investment
With
Allowance
 
Total
Recorded
Investment
 
Related
Allowance
September 30, 2014
 
 
 
 
 
 
 
 
 
Commercial and industrial:
 
 
 
 
 
 
 
 
 
Energy
$
706

 
$
637

 
$
—

 
$
637

 
$
—

Other commercial
42,058

 
27,967

 
3,082

 
31,049

 
1,413

Commercial real estate:
 
 
 
 
 
 
 
 
 
Buildings, land and other
24,032

 
17,512

 
992

 
18,504

 
776

Construction
476

 
289

 
—

 
289

 
—

Consumer real estate
825

 
624

 
—

 
624

 
—

Consumer and other
—

 
—

 
—

 
—

 
—

Total
$
68,097

 
$
47,029

 
$
4,074

 
$
51,103

 
$
2,189

December 31, 2013
 
 
 
 
 
 
 
 
 
Commercial and industrial:
 
 
 
 
 
 
 
 
 
Energy
$
545

 
$
531

 
$
—

 
$
531

 
$
—

Other commercial
31,429

 
15,337

 
7,004

 
22,341

 
4,140

Commercial real estate:
 
 
 
 
 
 
 
 
 
Buildings, land and other
27,792

 
15,697

 
8,870

 
24,567

 
2,786

Construction
—

 
—

 
—

 
—

 
—

Consumer real estate
907

 
745

 
—

 
745

 
—

Consumer and other
334

 
278

 
—

 
278

 
—

Total
$
61,007

 
$
32,588

 
$
15,874

 
$
48,462

 
$
6,926
Average Recorded Investment In Impaired Loans
The average recorded investment in impaired loans was as follows:
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
 
2014
 
2013
 
2014

2013
Commercial and industrial:
 
 
 
 
 
 
 
Energy
$
581

 
$
269

 
$
555

 
$
402

Other commercial
31,088

 
33,613

 
25,977

 
38,032

Commercial real estate:
 
 
 
 
 
 
 
Buildings, land and other
19,198

 
37,960

 
20,998

 
37,149

Construction
295

 
508

 
226

 
793

Consumer real estate
657

 
788

 
694

 
818

Consumer and other
126

 
338

 
199

 
365

Total
$
51,945

 
$
73,476

 
$
48,649

 
$
77,559
Troubled Debt Restructurings
Troubled debt restructurings during the nine months ended September 30, 2014 and September 30, 2013 are set forth in the following table.
 
Nine Months Ended 
 September 30, 2014
 
Nine Months Ended 
 September 30, 2013
 
Balance at
Restructure
 
Balance at
Period-End
 
Balance at
Restructure
 
Balance at
Period-End
Commercial and industrial:
 
 
 
 
 
 
 
Energy
$
—

 
$
—

 
$
528

 
$
537

Other commercial
3,752

 
3,516

 
5,862

 
5,067

Commercial real estate:

 

 

 

Buildings, land and other
3,122

 
3,008

 
7,443

 
7,000

 
$
6,874

 
$
6,524

 
$
13,833

 
$
12,604
Weighted Average Risk Grades for All Commercial Loans by Class
The following table presents weighted average risk grades for all commercial loans by class.
 
September 30, 2014
 
December 31, 2013
 
Weighted
Average
Risk Grade
 
Loans
 
Weighted
Average
Risk Grade
 
Loans
Commercial and industrial:
 
 
 
 
 
 
 
Energy
 
 
 
 
 
 
 
Risk grades 1-8
5.29

 
$
1,566,621

 
5.37

 
$
1,106,348

Risk grade 9
9.00

 
24,212

 
9.00

 
7,726

Risk grade 10
10.00

 
3,161

 
10.00

 
245

Risk grade 11
11.00

 
5,835

 
11.00

 
500

Risk grade 12
12.00

 
637

 
12.00

 
590

Risk grade 13
13.00

 
—

 
13.00

 
—

Total energy
5.38

 
$
1,600,466

 
5.40

 
$
1,115,409

Other commercial
 
 
 
 
 
 
 
Risk grades 1-8
5.94

 
$
3,697,503

 
5.95

 
$
3,507,963

Risk grade 9
9.00

 
58,045

 
9.00

 
74,766

Risk grade 10
10.00

 
65,561

 
10.00

 
89,878

Risk grade 11
11.00

 
55,403

 
11.00

 
92,917

Risk grade 12
12.00

 
32,008

 
12.00

 
21,389

Risk grade 13
13.00

 
1,901

 
13.00

 
4,754

Total other commercial
6.18

 
$
3,910,421

 
6.27

 
$
3,791,667

Commercial real estate:
 
 
 
 
 
 
 
Buildings, land and other
 
 
 
 
 
 
 
Risk grades 1-8
6.51

 
$
3,164,357

 
6.59

 
$
2,844,665

Risk grade 9
9.00

 
80,878

 
9.00

 
65,770

Risk grade 10
10.00

 
70,312

 
10.00

 
49,881

Risk grade 11
11.00

 
41,549

 
11.00

 
53,208

Risk grade 12
12.00

 
19,614

 
12.00

 
24,387

Risk grade 13
13.00

 
776

 
13.00

 
2,786

Total commercial real estate
6.73

 
$
3,377,486

 
6.83

 
$
3,040,697

Construction
 
 
 
 
 
 
 
Risk grades 1-8
7.00

 
$
631,616

 
7.05

 
$
418,999

Risk grade 9
9.00

 
2,494

 
9.00

 
1,301

Risk grade 10
10.00

 
5,855

 
10.00

 
5,931

Risk grade 11
11.00

 
2,738

 
11.00

 
408

Risk grade 12
12.00

 
289

 
12.00

 
—

Risk grade 13
13.00

 
—

 
13.00

 
—

Total construction
7.05

 
$
642,992

 
7.10

 
$
426,639
Net (Charge-Offs)/Recoveries, Segregated by Class of Loans
Net (charge-offs)/recoveries, segregated by class of loans, were as follows:
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
 
2014
 
2013
 
2014
 
2013
Commercial and industrial:
 
 
 
 
 
 
 
Energy
$
2

 
$
—

 
$
449

 
$
(900
)
Other commercial
738

 
(4,296
)
 
(2,539
)
 
(22,806
)
Commercial real estate:
 
 
 
 
 
 
 
Buildings, land and other
53

 
110

 
(1,965
)
 
81

Construction
31

 
16

 
346

 
246

Consumer real estate
(609
)
 
(457
)
 
(613
)
 
(718
)
Consumer and other
(579
)
 
(734
)
 
(1,718
)
 
(1,892
)
Total
$
(364
)
 
$
(5,361
)
 
$
(6,040
)
 
$
(25,989
)
Unallocated Portion of Allowance for Loan Losses
The following table presents details of the allowance for loan losses, segregated by loan portfolio segment.
 
Commercial
and
Industrial
 
Commercial
Real Estate
 
Consumer
Real Estate
 
Consumer
and Other
 
Unallocated
 
Total
September 30, 2014
 
 
 
 
 
 
 
 
 
 
 
Historical valuation allowances
$
32,092

 
$
14,638

 
$
2,003

 
$
10,425

 
$
—

 
$
59,158

Specific valuation allowances
1,413

 
776

 
—

 
—

 
—

 
2,189

General valuation allowances:
 
 
 
 
 
 
 
 
 
 
 
Environmental risk adjustment
6,713

 
3,548

 
474

 
2,668

 
—

 
13,403

Distressed industries
3,784

 
2

 
—

 
—

 
—

 
3,786

Excessive industry concentrations
1,871

 
299

 
—

 
—

 
—

 
2,170

Large relationship concentrations
2,012

 
1,469

 
—

 
—

 
—

 
3,481

Highly-leveraged credit relationships
3,662

 
1,061

 
—

 
—

 
—

 
4,723

Policy exceptions
2,054

 
938

 
—

 
—

 
—

 
2,992

Credit and collateral exceptions
1,148

 
524

 
—

 
—

 
—

 
1,672

Loans not reviewed by concurrence
2,121

 
2,295

 
2,315

 
1,185

 
—

 
7,916

Adjustment for recoveries
(4,517
)
 
(1,640
)
 
(264
)
 
(7,372
)
 
—

 
(13,793
)
General macroeconomic risk
6,283

 
2,870

 
579

 
883

 
—

 
10,615

Total
$
58,636

 
$
26,780

 
$
5,107

 
$
7,789

 
$
—

 
$
98,312

December 31, 2013
 
 
 
 
 
 
 
 
 
 
 
Historical valuation allowances
$
29,357

 
$
13,042

 
$
2,644

 
$
8,695

 
$
—

 
$
53,738

Specific valuation allowances
4,140

 
2,786

 
—

 
—

 
—

 
6,926

General valuation allowances:
 
 
 
 
 
 
 
 
 
 
 
Environmental risk adjustment
5,497

 
3,314

 
664

 
2,331

 
—

 
11,806

Distressed industries
7,812

 
384

 
—

 
—

 
—

 
8,196

Excessive industry concentrations
1,499

 
367

 
—

 
—

 
—

 
1,866

Large relationship concentrations
1,529

 
1,081

 
—

 
—

 
—

 
2,610

Highly-leveraged credit relationships
4,535

 
619

 
—

 
—

 
—

 
5,154

Policy exceptions
—

 
—

 
—

 
—

 
2,492

 
2,492

Credit and collateral exceptions
—

 
—

 
—

 
—

 
1,398

 
1,398

Loans not reviewed by concurrence
2,009

 
2,201

 
2,250

 
1,064

 
—

 
7,524

Adjustment for recoveries
(3,588
)
 
(1,204
)
 
(328
)
 
(7,080
)
 
—

 
(12,200
)
General macroeconomic risk
—

 
—

 
—

 
—

 
2,928

 
2,928

Total
$
52,790

 
$
22,590

 
$
5,230

 
$
5,010

 
$
6,818

 
$
92,438
Activity in Allowance for Loan Losses by Portfolio Segment
The following table details activity in the allowance for loan losses by portfolio segment for the three and nine months ended September 30, 2014 and 2013. Allocation of a portion of the allowance to one category of loans does not preclude its availability to absorb losses in other categories.
 
Commercial
and
Industrial
 
Commercial
Real Estate
 
Consumer
Real Estate
 
Consumer
and Other
 
Unallocated
 
Total
Three months ended:
 
 
 
 
 
 
 
 
 
 
 
September 30, 2014
 
 
 
 
 
 
 
 
 
 
 
Beginning balance
$
55,672

 
$
22,046

 
$
4,659

 
$
6,427

 
$
9,482

 
$
98,286

Provision for loan losses
2,224

 
4,650

 
1,057

 
1,941

 
(9,482
)
 
390

Charge-offs
(3,631
)
 
(393
)
 
(714
)
 
(2,523
)
 
—

 
(7,261
)
Recoveries
4,371

 
477

 
105

 
1,944

 
—

 
6,897

Net charge-offs
740

 
84

 
(609
)
 
(579
)
 
—

 
(364
)
Ending balance
$
58,636

 
$
26,780

 
$
5,107

 
$
7,789

 
$
—

 
$
98,312

 
 
 
 
 
 
 
 
 
 
 
 
September 30, 2013
 
 
 
 
 
 
 
 
 
 
 
Beginning balance
$
50,814

 
$
23,573

 
$
4,917

 
$
4,130

 
$
9,966

 
$
93,400

Provision for loan losses
8,060

 
(1,983
)
 
638

 
1,286

 
(2,893
)
 
5,108

Charge-offs
(4,962
)
 
(56
)
 
(514
)
 
(2,610
)
 
—

 
(8,142
)
Recoveries
666

 
182

 
57

 
1,876

 
—

 
2,781

Net charge-offs
(4,296
)
 
126

 
(457
)
 
(734
)
 
—

 
(5,361
)
Ending balance
$
54,578

 
$
21,716

 
$
5,098

 
$
4,682

 
$
7,073

 
$
93,147

 
 
 
 
 
 
 
 
 
 
 
 
Nine months ended:
 
 
 
 
 
 
 
 
 
 
 
September 30, 2014
 
 
 
 
 
 
 
 
 
 
 
Beginning balance
$
52,790

 
$
22,590

 
$
5,230

 
$
5,010

 
$
6,818

 
$
92,438

Provision for loan losses
7,936

 
5,809

 
490

 
4,497

 
(6,818
)
 
11,914

Charge-offs
(9,026
)
 
(3,119
)
 
(840
)
 
(7,279
)
 
—

 
(20,264
)
Recoveries
6,936

 
1,500

 
227

 
5,561

 
—

 
14,224

Net charge-offs
(2,090
)
 
(1,619
)
 
(613
)
 
(1,718
)
 
—

 
(6,040
)
Ending balance
$
58,636

 
$
26,780

 
$
5,107

 
$
7,789

 
$
—

 
$
98,312

 
 
 
 
 
 
 
 
 
 
 
 
September 30, 2013
 
 
 
 
 
 
 
 
 
 
 
Beginning balance
$
54,164

 
$
29,346

 
$
5,252

 
$
3,507

 
$
12,184

 
$
104,453

Provision for loan losses
24,120

 
(7,957
)
 
564

 
3,067

 
(5,111
)
 
14,683

Charge-offs
(25,700
)
 
(737
)
 
(1,009
)
 
(7,161
)
 
—

 
(34,607
)
Recoveries
1,994

 
1,064

 
291

 
5,269

 
—

 
8,618

Net charge-offs
(23,706
)
 
327

 
(718
)
 
(1,892
)
 
—

 
(25,989
)
Ending balance
$
54,578

 
$
21,716

 
$
5,098

 
$
4,682

 
$
7,073

 
$
93,147
Allowance for Loan Losses Disaggregated on the Basis of Impairment Methodology
The following table details the amount of the allowance for loan losses allocated to each portfolio segment as of September 30, 2014, December 31, 2013 and September 30, 2013, detailed on the basis of the impairment methodology used by the Corporation.
 
Commercial
and
Industrial
 
Commercial
Real Estate
 
Consumer
Real Estate
 
Consumer
and Other
 
Unallocated
 
Total
September 30, 2014
 
 
 
 
 
 
 
 
 
 
 
Loans individually evaluated for impairment
$
13,104

 
$
1,867

 
$
—

 
$
—

 
$
—

 
$
14,971

Loans collectively evaluated for impairment
45,532

 
24,913

 
5,107

 
7,789

 
—

 
83,341

Balance at September 30, 2014
$
58,636

 
$
26,780

 
$
5,107

 
$
7,789

 
$
—

 
$
98,312

December 31, 2013
 
 
 
 
 
 
 
 
 
 
 
Loans individually evaluated for impairment
$
16,682

 
$
3,914

 
$
—

 
$
—

 
$
—

 
$
20,596

Loans collectively evaluated for impairment
36,108

 
18,676

 
5,230

 
5,010

 
6,818

 
71,842

Balance at December 31, 2013
$
52,790

 
$
22,590

 
$
5,230

 
$
5,010

 
$
6,818

 
$
92,438

September 30, 2013
 
 
 
 
 
 
 
 
 
 
 
Loans individually evaluated for impairment
$
15,912

 
$
3,511

 
$
—

 
$
—

 
$
—

 
$
19,423

Loans collectively evaluated for impairment
38,666

 
18,205

 
5,098

 
4,682

 
7,073

 
73,724

Balance at September 30, 2013
$
54,578

 
$
21,716

 
$
5,098

 
$
4,682

 
$
7,073

 
$
93,147
Investment in Loans Related to Allowance for Loan Losses by Portfolio Segment Disaggregated Based on Impairment Methodology
The Corporation’s recorded investment in loans as of September 30, 2014, December 31, 2013 and September 30, 2013 related to each balance in the allowance for loan losses by portfolio segment and detailed on the basis of the impairment methodology used by the Corporation was as follows:
 
Commercial
and
Industrial
 
Commercial
Real Estate
 
Consumer
Real Estate
 
Consumer
and Other
 
Unearned
Discounts
 
Total
September 30, 2014
 
 
 
 
 
 
 
 
 
 
 
Loans individually evaluated for impairment
$
164,506

 
$
141,133

 
$
624

 
$
—

 
$
—

 
$
306,263

Loans collectively evaluated for impairment
5,346,381

 
3,879,345

 
846,444

 
391,498

 
(23,147
)
 
10,440,521

Ending balance
$
5,510,887

 
$
4,020,478

 
$
847,068

 
$
391,498

 
$
(23,147
)
 
$
10,746,784

December 31, 2013
 
 
 
 
 
 
 
 
 
 
 
Loans individually evaluated for impairment
$
210,273

 
$
136,601

 
$
745

 
$
278

 
$
—

 
$
347,897

Loans collectively evaluated for impairment
4,696,803

 
3,330,735

 
807,459

 
357,838

 
(25,032
)
 
9,167,803

Ending balance
$
4,907,076

 
$
3,467,336

 
$
808,204

 
$
358,116

 
$
(25,032
)
 
$
9,515,700

September 30, 2013
 
 
 
 
 
 
 
 
 
 
 
Loans individually evaluated for impairment
$
173,513

 
$
147,302

 
$
773

 
$
311

 
$
—

 
$
321,899

Loans collectively evaluated for impairment
4,635,159

 
3,223,667

 
799,054

 
349,801

 
(23,126
)
 
8,984,555

Ending balance
$
4,808,672

 
$
3,370,969

 
$
799,827

 
$
350,112

 
$
(23,126
)
 
$
9,306,454