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Loans (Tables)
 9 Months Ended
Sep. 30, 2013
Receivables [Abstract]  
Loans
Loans were as follows:
 
September 30,
2013
 
Percentage
of Total
 
December 31,
2012
 
Percentage
of Total
Commercial and industrial:
 
 
 
 
 
 
 
Commercial
$
4,357,696

 
46.8
 %
 
$
4,357,100

 
47.2
 %
Leases
306,649

 
3.3

 
278,535

 
3.0

Asset-based
144,327

 
1.6

 
192,977

 
2.1

Total commercial and industrial
4,808,672

 
51.7

 
4,828,612

 
52.3

Commercial real estate:
 
 
 
 
 
 
 
Commercial mortgages
2,746,821

 
29.5

 
2,495,481

 
27.1

Construction
412,529

 
4.4

 
608,306

 
6.6

Land
211,619

 
2.3

 
216,008

 
2.3

Total commercial real estate
3,370,969

 
36.2

 
3,319,795

 
36.0

Consumer real estate:
 
 
 
 
 
 
 
Home equity loans
331,349

 
3.5

 
310,675

 
3.4

Home equity lines of credit
193,449

 
2.1

 
186,522

 
2.0

1-4 family residential mortgages
33,568

 
0.3

 
38,323

 
0.4

Construction
9,884

 
0.1

 
17,621

 
0.2

Other
231,577

 
2.5

 
224,206

 
2.4

Total consumer real estate
799,827

 
8.5

 
777,347

 
8.4

Total real estate
4,170,796

 
44.7

 
4,097,142

 
44.4

Consumer and other:
 
 
 
 
 
 
 
Consumer installment
333,885

 
3.6

 
311,310

 
3.4

Other
16,227

 
0.2

 
8,435

 
0.1

Total consumer and other
350,112

 
3.8

 
319,745

 
3.5

Unearned discounts
(23,126
)
 
(0.2
)
 
(21,651
)
 
(0.2
)
Total loans
$
9,306,454

 
100.0
 %
 
$
9,223,848

 
100.0
 %
Non-Accrual Loans, Segregated by Class of Loans
Non-accrual loans, segregated by class of loans, were as follows:
 
September 30,
2013
 
December 31,
2012
Commercial and industrial:
 
 
 
Energy
$
766

 
$
1,150

Other commercial
34,695

 
45,158

Commercial real estate:
 
 
 
Buildings, land and other
40,541

 
38,631

Construction
—

 
1,100

Consumer real estate
2,298

 
2,773

Consumer and other
781

 
932

Total
$
79,081

 
$
89,744
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, 2013 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
$
532

 
$
228

 
$
760

 
$
1,078,139

 
$
1,078,899

 
$
—

Other commercial
18,105

 
16,838

 
34,943

 
3,694,830

 
3,729,773

 
6,606

Commercial real estate:
 
 
 
 
 
 
 
 
 
 
 
Buildings, land and other
11,019

 
33,578

 
44,597

 
2,913,843

 
2,958,440

 
1,683

Construction
—

 
—

 
—

 
412,529

 
412,529

 
—

Consumer real estate
6,248

 
2,848

 
9,096

 
790,731

 
799,827

 
2,480

Consumer and other
4,182

 
653

 
4,835

 
345,277

 
350,112

 
452

Unearned discounts
—

 
—

 
—

 
(23,126
)
 
(23,126
)
 
—

Total
$
40,086

 
$
54,145

 
$
94,231

 
$
9,212,223

 
$
9,306,454

 
$
11,221
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, 2013
 
 
 
 
 
 
 
 
 
Commercial and industrial:
 
 
 
 
 
 
 
 
 
Energy
$
545

 
$
538

 
$
—

 
$
538

 
$
—

Other commercial
41,214

 
19,134

 
11,528

 
30,662

 
6,607

Commercial real estate:
 
 
 
 
 
 
 
 
 
Buildings, land and other
46,227

 
23,514

 
13,978

 
37,492

 
2,342

Construction
—

 
—

 
—

 
—

 
—

Consumer real estate
920

 
773

 
—

 
773

 
—

Consumer and other
352

 
311

 
—

 
311

 
—

Total
$
89,258

 
$
44,270

 
$
25,506

 
$
69,776

 
$
8,949

December 31, 2012
 
 
 
 
 
 
 
 
 
Commercial and industrial:
 
 
 
 
 
 
 
 
 
Energy
$
1,255

 
$
—

 
$
1,069

 
$
1,069

 
$
900

Other commercial
56,784

 
21,709

 
19,096

 
40,805

 
4,200

Commercial real estate:
 
 
 
 
 
 
 
 
 
Buildings, land and other
44,652

 
19,010

 
17,149

 
36,159

 
3,137

Construction
1,497

 
1,100

 
—

 
1,100

 
—

Consumer real estate
961

 
864

 
—

 
864

 
—

Consumer and other
428

 
400

 
—

 
400

 
—

Total
$
105,577

 
$
43,083

 
$
37,314

 
$
80,397

 
$
8,237
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,
 
2013
 
2012
 
2013

2012
Commercial and industrial:
 
 
 
 
 
 
 
Energy
$
269

 
$
—

 
$
402

 
$
—

Other commercial
33,613

 
44,140

 
38,032

 
43,087

Commercial real estate:
 
 
 
 
 
 
 
Buildings, land and other
37,960

 
42,569

 
37,149

 
41,283

Construction
508

 
1,671

 
793

 
1,465

Consumer real estate
788

 
1,087

 
818

 
1,805

Consumer and other
338

 
430

 
365

 
487

Total
$
73,476

 
$
89,897

 
$
77,559

 
$
88,127
Troubled Debt Restructurings
Troubled debt restructurings during the nine months ended September 30, 2013 and September 30, 2012 are set forth in the following table. Amounts represent the aggregate balance of the loans as of their individual restructuring dates.
 
Nine Months Ended 
 September 30,
 
2013
 
2012
Commercial and industrial:
 
 
 
Energy
$
528

 
$
—

Other commercial
5,862

 
445

Commercial real estate:
 
 
 
Buildings, land and other
7,443

 
—

 
$
13,833

 
$
445
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, 2013
 
December 31, 2012
 
Weighted
Average
Risk Grade
 
Loans
 
Weighted
Average
Risk Grade
 
Loans
Commercial and industrial:
 
 
 
 
 
 
 
Energy
 
 
 
 
 
 
 
Risk grades 1-8
5.31

 
$
1,066,168

 
5.24

 
$
1,081,725

Risk grade 9
9.00

 
11,172

 
9.00

 
392

Risk grade 10
10.00

 
268

 
10.00

 
—

Risk grade 11
11.00

 
525

 
11.00

 
—

Risk grade 12
12.00

 
766

 
12.00

 
169

Risk grade 13
13.00

 
—

 
13.00

 
900

Total energy
5.36

 
$
1,078,899

 
5.25

 
$
1,083,186

Other commercial
 
 
 
 
 
 
 
Risk grades 1-8
5.95

 
$
3,467,415

 
5.81

 
$
3,367,443

Risk grade 9
9.00

 
90,404

 
9.00

 
250,508

Risk grade 10
10.00

 
76,834

 
10.00

 
28,440

Risk grade 11
11.00

 
60,558

 
11.00

 
53,797

Risk grade 12
12.00

 
27,286

 
12.00

 
40,603

Risk grade 13
13.00

 
7,276

 
13.00

 
4,635

Total other commercial
6.25

 
$
3,729,773

 
6.21

 
$
3,745,426

Commercial real estate:
 
 
 
 
 
 
 
Buildings, land and other
 
 
 
 
 
 
 
Risk grades 1-8
6.59

 
$
2,742,070

 
6.63

 
$
2,460,448

Risk grade 9
9.00

 
70,918

 
9.00

 
92,041

Risk grade 10
10.00

 
50,321

 
10.00

 
42,603

Risk grade 11
11.00

 
54,405

 
11.00

 
77,658

Risk grade 12
12.00

 
38,384

 
12.00

 
35,602

Risk grade 13
13.00

 
2,342

 
13.00

 
3,137

Total commercial real estate
6.86

 
$
2,958,440

 
6.97

 
$
2,711,489

Construction
 
 
 
 
 
 
 
Risk grades 1-8
6.99

 
$
409,359

 
6.82

 
$
579,108

Risk grade 9
9.00

 
1,320

 
9.00

 
23,046

Risk grade 10
10.00

 
1,437

 
10.00

 
4,435

Risk grade 11
11.00

 
413

 
11.00

 
617

Risk grade 12
12.00

 
—

 
12.00

 
1,100

Risk grade 13
13.00

 
—

 
13.00

 
—

Total construction
7.01

 
$
412,529

 
6.94

 
$
608,306
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,
 
2013
 
2012
 
2013
 
2012
Commercial and industrial:
 
 
 
 
 
 
 
Energy
$
—

 
$
—

 
$
(900
)
 
$
4

Other commercial
(4,296
)
 
(4,656
)
 
(22,806
)
 
(9,511
)
Commercial real estate:
 
 
 
 
 
 
 
Buildings, land and other
110

 
2,678

 
81

 
811

Construction
16

 
14

 
246

 
36

Consumer real estate
(457
)
 
(156
)
 
(718
)
 
(441
)
Consumer and other
(734
)
 
(627
)
 
(1,892
)
 
(1,600
)
Total
$
(5,361
)
 
$
(2,747
)
 
$
(25,989
)
 
$
(10,701
)
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, 2013
 
 
 
 
 
 
 
 
 
 
 
Historical valuation allowances
$
26,175

 
$
12,705

 
$
2,628

 
$
8,499

 
$
—

 
$
50,007

Specific valuation allowances
6,607

 
2,342

 
—

 
—

 
—

 
8,949

General valuation allowances:
 
 
 
 
 
 
 
 
 
 
 
Environmental risk adjustment
5,169

 
3,085

 
631

 
2,193

 
—

 
11,078

Distressed industries
8,205

 
444

 
—

 
—

 
—

 
8,649

Excessive industry concentrations
2,865

 
499

 
—

 
—

 
—

 
3,364

Large relationship concentrations
1,395

 
978

 
—

 
—

 
—

 
2,373

Highly-leveraged credit relationships
4,850

 
723

 
—

 
—

 
—

 
5,573

Policy exceptions
—

 
—

 
—

 
—

 
2,401

 
2,401

Credit and collateral exceptions
—

 
—

 
—

 
—

 
1,562

 
1,562

Loans not reviewed by concurrence
1,979

 
2,169

 
2,229

 
1,035

 
—

 
7,412

Adjustment for recoveries
(2,667
)
 
(1,229
)
 
(390
)
 
(7,045
)
 
—

 
(11,331
)
General macroeconomic risk
—

 
—

 
—

 
—

 
3,110

 
3,110

Total
$
54,578

 
$
21,716

 
$
5,098

 
$
4,682

 
$
7,073

 
$
93,147

 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2012
 
 
 
 
 
 
 
 
 
 
 
Historical valuation allowances
$
30,565

 
$
15,687

 
$
3,013

 
$
7,344

 
$
—

 
$
56,609

Specific valuation allowances
5,100

 
3,137

 
—

 
—

 
—

 
8,237

General valuation allowances:
 
 
 
 
 
 
 
 
 
 
 
Environmental risk adjustment
6,593

 
3,682

 
684

 
1,816

 
—

 
12,775

Distressed industries
5,883

 
1,182

 
—

 
—

 
—

 
7,065

Excessive industry concentrations
4,291

 
2,795

 
—

 
—

 
—

 
7,086

Large relationship concentrations
1,420

 
981

 
—

 
—

 
—

 
2,401

Highly-leveraged credit relationships
2,905

 
699

 
—

 
—

 
—

 
3,604

Policy exceptions
—

 
—

 
—

 
—

 
2,466

 
2,466

Credit and collateral exceptions
—

 
—

 
—

 
—

 
1,635

 
1,635

Loans not reviewed by concurrence
2,277

 
2,413

 
2,411

 
1,159

 
—

 
8,260

Adjustment for recoveries
(4,870
)
 
(1,230
)
 
(856
)
 
(6,812
)
 
—

 
(13,768
)
General macroeconomic risk
—

 
—

 
—

 
—

 
8,083

 
8,083

Total
$
54,164

 
$
29,346

 
$
5,252

 
$
3,507

 
$
12,184

 
$
104,453
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, 2013 and 2012. 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, 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

 
 
 
 
 
 
 
 
 
 
 
 
September 30, 2012
 
 
 
 
 
 
 
 
 
 
 
Beginning balance
$
53,475

 
$
27,631

 
$
5,235

 
$
3,649

 
$
15,658

 
$
105,648

Provision for loan losses
2,723

 
(2,682
)
 
315

 
880

 
1,264

 
2,500

Charge-offs
(5,837
)
 
(520
)
 
(209
)
 
(2,391
)
 
—

 
(8,957
)
Recoveries
1,181

 
3,212

 
53

 
1,764

 
—

 
6,210

Net charge-offs
(4,656
)
 
2,692

 
(156
)
 
(627
)
 
—

 
(2,747
)
Ending balance
$
51,542

 
$
27,641

 
$
5,394

 
$
3,902

 
$
16,922

 
$
105,401

 
 
 
 
 
 
 
 
 
 
 
 
Nine months ended:
 
 
 
 
 
 
 
 
 
 
 
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

 
 
 
 
 
 
 
 
 
 
 
 
September 30, 2012
 
 
 
 
 
 
 
 
 
 
 
Beginning balance
$
42,774

 
$
20,912

 
$
3,540

 
$
12,635

 
$
30,286

 
$
110,147

Provision for loan losses
18,275

 
5,882

 
2,295

 
(7,133
)
 
(13,364
)
 
5,955

Charge-offs
(13,323
)
 
(3,715
)
 
(1,104
)
 
(6,605
)
 
—

 
(24,747
)
Recoveries
3,816

 
4,562

 
663

 
5,005

 
—

 
14,046

Net charge-offs
(9,507
)
 
847

 
(441
)
 
(1,600
)
 
—

 
(10,701
)
Ending balance
$
51,542

 
$
27,641

 
$
5,394

 
$
3,902

 
$
16,922

 
$
105,401
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, 2013, December 31, 2012 and September 30, 2012, 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, 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

 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2012
 
 
 
 
 
 
 
 
 
 
 
Loans individually evaluated for impairment
$
13,171

 
$
4,366

 
$
—

 
$
—

 
$
—

 
$
17,537

Loans collectively evaluated for impairment
40,993

 
24,980

 
5,252

 
3,507

 
12,184

 
86,916

Balance at December 31, 2012
$
54,164

 
$
29,346

 
$
5,252

 
$
3,507

 
$
12,184

 
$
104,453

 
 
 
 
 
 
 
 
 
 
 
 
September 30, 2012
 
 
 
 
 
 
 
 
 
 
 
Loans individually evaluated for impairment
$
14,301

 
$
2,149

 
$
—

 
$
—

 
$
—

 
$
16,450

Loans collectively evaluated for impairment
37,241

 
25,492

 
5,394

 
3,902

 
16,922

 
88,951

Balance at September 30, 2012
$
51,542

 
$
27,641

 
$
5,394

 
$
3,902

 
$
16,922

 
$
105,401
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, 2013, December 31, 2012 and September 30, 2012 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, 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

 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2012
 
 
 
 
 
 
 
 
 
 
 
Loans individually evaluated for impairment
$
128,544

 
$
165,152

 
$
864

 
$
400

 
$
—

 
$
294,960

Loans collectively evaluated for impairment
4,700,068

 
3,154,643

 
776,483

 
319,345

 
(21,651
)
 
8,928,888

Ending balance
$
4,828,612

 
$
3,319,795

 
$
777,347

 
$
319,745

 
$
(21,651
)
 
$
9,223,848

 
 
 
 
 
 
 
 
 
 
 
 
September 30, 2012
 
 
 
 
 
 
 
 
 
 
 
Loans individually evaluated for impairment
$
161,577

 
$
170,077

 
$
894

 
$
420

 
$
—

 
$
332,968

Loans collectively evaluated for impairment
4,324,724

 
3,080,058

 
767,588

 
325,172

 
(19,470
)
 
8,478,072

Ending balance
$
4,486,301

 
$
3,250,135

 
$
768,482

 
$
325,592

 
$
(19,470
)
 
$
8,811,040