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Loans (Tables)
 3 Months Ended
Mar. 31, 2016
Receivables [Abstract]  
Loans
Loans were as follows:
 
March 31,
2016
 
Percentage
of Total
 
December 31,
2015
 
Percentage
of Total
Commercial and industrial
$
4,184,960

 
36.3
%
 
$
4,120,522

 
35.9
%
Energy:
 
 
 
 
 
 
 
Production
1,175,149

 
10.2

 
1,249,678

 
10.9

Service
251,147

 
2.2

 
272,934

 
2.4

Other
230,064

 
2.0

 
235,583

 
2.0

Total energy
1,656,360

 
14.4

 
1,758,195

 
15.3

Commercial real estate:
 
 
 
 
 
 
 
Commercial mortgages
3,351,533

 
29.0

 
3,285,041

 
28.6

Construction
752,916

 
6.5

 
720,695

 
6.3

Land
282,354

 
2.5

 
286,991

 
2.5

Total commercial real estate
4,386,803

 
38.0

 
4,292,727

 
37.4

Consumer real estate:
 
 
 
 
 
 
 
Home equity loans
341,327

 
3.0

 
340,528

 
3.0

Home equity lines of credit
236,290

 
2.0

 
233,525

 
2.0

Other
302,611

 
2.6

 
306,696

 
2.6

Total consumer real estate
880,228

 
7.6

 
880,749

 
7.6

Total real estate
5,267,031

 
45.6

 
5,173,476

 
45.0

Consumer and other
433,684

 
3.7

 
434,338

 
3.8

Total loans
$
11,542,035

 
100.0
%
 
$
11,486,531

 
100.0
%
Non-Accrual Loans, Segregated by Class of Loans
Non-accrual loans, segregated by class of loans, were as follows:
 
March 31,
2016
 
December 31,
2015
Commercial and industrial
$
26,922

 
$
25,111

Energy
114,124

 
21,180

Commercial real estate:
 
 
 
Buildings, land and other
33,449

 
34,519

Construction
970

 
569

Consumer real estate
1,770

 
1,862

Consumer and other
220

 
226

Total
$
177,455

 
$
83,467
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 March 31, 2016 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
$
26,818

 
$
23,617

 
$
50,435

 
$
4,134,525

 
$
4,184,960

 
$
4,909

Energy
12,616

 
15,499

 
28,115

 
1,628,245

 
1,656,360

 
1,262

Commercial real estate:
 
 
 
 
 
 
 
 
 
 
 
Buildings, land and other
15,129

 
26,135

 
41,264

 
3,592,623

 
3,633,887

 
805

Construction
1,300

 
995

 
2,295

 
750,621

 
752,916

 
669

Consumer real estate
5,276

 
1,380

 
6,656

 
873,572

 
880,228

 
1,269

Consumer and other
5,203

 
399

 
5,602

 
428,082

 
433,684

 
338

Total
$
66,342

 
$
68,025

 
$
134,367

 
$
11,407,668

 
$
11,542,035

 
$
9,252
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
March 31, 2016
 
 
 
 
 
 
 
 
 
Commercial and industrial
$
27,980

 
$
20,367

 
$
4,390

 
$
24,757

 
$
2,852

Energy
122,242

 
27,612

 
86,479

 
114,091

 
27,450

Commercial real estate:
 
 
 
 
 
 
 
 
 
Buildings, land and other
36,348

 
31,545

 
—

 
31,545

 
—

Construction
1,218

 
970

 
—

 
970

 
—

Consumer real estate
740

 
457

 
—

 
457

 
—

Consumer and other
—

 
—

 
—

 
—

 
—

Total
$
188,528

 
$
80,951

 
$
90,869

 
$
171,820

 
$
30,302

December 31, 2015
 
 
 
 
 
 
 
 
 
Commercial and industrial
$
26,067

 
$
18,776

 
$
4,084

 
$
22,860

 
$
2,378

Energy
25,240

 
8,689

 
12,450

 
21,139

 
2,000

Commercial real estate:
 
 
 
 
 
 
 
 
 
Buildings, land and other
37,126

 
32,425

 
—

 
32,425

 
—

Construction
793

 
569

 
—

 
569

 
—

Consumer real estate
755

 
485

 
—

 
485

 
—

Consumer and other
—

 
—

 
—

 
—

 
—

Total
$
89,981

 
$
60,944

 
$
16,534

 
$
77,478

 
$
4,378
Average Recorded Investment In Impaired Loans
The average recorded investment in impaired loans was as follows:
 
Three Months Ended 
 March 31,
 
2016

2015
Commercial and industrial
$
23,809

 
$
31,428

Energy
67,615

 
636

Commercial real estate:
 
 
 
Buildings, land and other
31,985

 
16,313

Construction
770

 
2,767

Consumer real estate
471

 
582

Consumer and other
—

 
—

Total
$
124,650

 
$
51,726
Troubled Debt Restructurings
Troubled debt restructurings during the three months ended March 31, 2016 and March 31, 2015 are set forth in the following table.
 
Three Months Ended
March 31, 2016
 
Three Months Ended
March 31, 2015
 
Balance at
Restructure
 
Balance at
Period-End
 
Balance at
Restructure
 
Balance at
Period-End
Commercial and industrial
$
19

 
$
17

 
$
709

 
$
613

Energy
62,546

 
61,095

 
—

 
—

Commercial real estate:
 
 
 
 
 
 
 
Construction
243

 
235

 
—

 
—

 
$
62,808

 
$
61,347

 
$
709

 
$
613
Weighted Average Risk Grades for All Commercial Loans by Class
The following tables present weighted average risk grades for all commercial loans by class.
 
March 31, 2016
 
December 31, 2015
 
Weighted
Average
Risk Grade
 
Loans
 
Weighted
Average
Risk Grade
 
Loans
Commercial and industrial:
 
 
 
 
 
 
 
Risk grades 1-8
5.92

 
$
3,888,217

 
5.88

 
$
3,869,203

Risk grade 9
9.00

 
121,570

 
9.00

 
100,670

Risk grade 10
10.00

 
84,614

 
10.00

 
76,030

Risk grade 11
11.00

 
63,637

 
11.00

 
49,508

Risk grade 12
12.00

 
23,994

 
12.00

 
22,644

Risk grade 13
13.00

 
2,928

 
13.00

 
2,467

Total
6.21

 
$
4,184,960

 
6.13

 
$
4,120,522

Energy
 
 
 
 
 
 
 
Risk grades 1-8
6.16

 
$
846,191

 
6.12

 
$
1,385,749

Risk grade 9
9.00

 
216,140

 
9.00

 
212,250

Risk grade 10
10.00

 
276,693

 
10.00

 
62,163

Risk grade 11
11.00

 
203,213

 
11.00

 
76,853

Risk grade 12
12.00

 
85,919

 
12.00

 
19,180

Risk grade 13
13.00

 
28,204

 
13.00

 
2,000

Total
8.18

 
$
1,656,360

 
6.89

 
$
1,758,195


(continued)
March 31, 2016
 
December 31, 2015
 
Weighted
Average
Risk Grade
 
Loans
 
Weighted
Average
Risk Grade
 
Loans
Commercial real estate:
 
 

 
 
 
 
Buildings, land and other
 
 
 
 
 
 
 
Risk grades 1-8
6.60

 
$
3,324,030

 
6.58

 
$
3,280,435

Risk grade 9
9.00

 
133,790

 
9.00

 
140,900

Risk grade 10
10.00

 
79,584

 
10.00

 
72,577

Risk grade 11
11.00

 
63,034

 
11.00

 
43,601

Risk grade 12
12.00

 
33,449

 
12.00

 
34,519

Risk grade 13
13.00

 
—

 
13.00

 
—

Total
6.89

 
$
3,633,887

 
6.85

 
$
3,572,032

Construction
 
 
 
 
 
 
 
Risk grades 1-8
7.05

 
$
739,863

 
6.91

 
$
696,229

Risk grade 9
9.00

 
10,759

 
9.00

 
13,074

Risk grade 10
10.00

 
1,271

 
10.00

 
2,757

Risk grade 11
11.00

 
53

 
11.00

 
8,066

Risk grade 12
12.00

 
970

 
12.00

 
569

Risk grade 13
13.00

 
—

 
13.00

 
—

Total
7.09

 
$
752,916

 
7.01

 
$
720,695
Net (Charge-Offs)/Recoveries, Segregated by Class of Loans
Net (charge-offs)/recoveries, segregated by class of loans, were as follows:
 
Three Months Ended 
 March 31,
 
2016
 
2015
Commercial and industrial
$
(1,132
)
 
$
(852
)
Energy
(1,011
)
 
2

Commercial real estate:
 
 
 
Buildings, land and other
61

 
(307
)
Construction
7

 
1

Consumer real estate
99

 
(28
)
Consumer and other
(503
)
 
(812
)
Total
$
(2,479
)
 
$
(1,996
)
Unallocated Portion of Allowance for Loan Losses
The following table presents details of the allowance for loan losses allocated to each portfolio segment as of March 31, 2016 and December 31, 2015 and detailed on the basis of the impairment evaluation methodology we used:
 
Commercial
and
Industrial
 
Energy
 
Commercial
Real Estate
 
Consumer
Real Estate
 
Consumer
and Other
 
Total
March 31, 2016
 
 
 
 
 
 
 
 
 
 
 
Historical valuation allowances
$
28,755

 
$
43,633

 
$
15,352

 
$
2,097

 
$
4,387

 
$
94,224

Specific valuation allowances
2,852

 
27,450

 
—

 
—

 
—

 
30,302

General valuation allowances
5,790

 
3,673

 
4,047

 
1,230

 
(426
)
 
14,314

Macroeconomic valuation allowances
7,687

 
10,217

 
4,188

 
459

 
489

 
23,040

Total
45,084

 
84,973

 
23,587

 
3,786

 
4,450

 
161,880

Allocated to loans:
 
 
 
 
 
 
 
 
 
 
 
Individually evaluated
$
2,852

 
$
27,450

 
$
—

 
$
—

 
$
—

 
$
30,302

Collectively evaluated
42,232

 
57,523

 
23,587

 
3,786

 
4,450

 
131,578

Total
$
45,084

 
$
84,973

 
$
23,587

 
$
3,786

 
$
4,450

 
$
161,880

December 31, 2015
 
 
 
 
 
 
 
 
 
 
 
Historical valuation allowances
$
25,428

 
$
21,195

 
$
15,544

 
$
2,109

 
$
12,813

 
$
77,089

Specific valuation allowances
2,378

 
2,000

 
—

 
—

 
—

 
4,378

General valuation allowances
7,339

 
5,525

 
4,619

 
2,052

 
(6,932
)
 
12,603

Macroeconomic valuation allowances
7,848

 
25,976

 
4,150

 
498

 
3,317

 
41,789

Total
42,993

 
54,696

 
24,313

 
4,659

 
9,198

 
135,859

Allocated to loans:
 
 
 
 
 
 
 
 
 
 
 
Individually evaluated
$
2,378

 
$
2,000

 
$
—

 
$
—

 
$
—

 
$
4,378

Collectively evaluated
40,615

 
52,696

 
24,313

 
4,659

 
9,198

 
131,481

Total
$
42,993

 
$
54,696

 
$
24,313

 
$
4,659

 
$
9,198

 
$
135,859
Investment in Loans Related to Allowance for Loan Losses by Portfolio Segment Disaggregated Based on Impairment Methodology
Our recorded investment in loans as of March 31, 2016 and December 31, 2015 related to each balance in the allowance for loan losses by portfolio segment and detailed on the basis of the impairment methodology we used was as follows:
 
Commercial
and
Industrial
 
Energy
 
Commercial
Real Estate
 
Consumer
Real Estate
 
Consumer
and Other
 
Total
March 31, 2016
 
 
 
 
 
 
 
 
 
 
 
Individually evaluated
$
24,757

 
$
114,091

 
$
32,515

 
$
457

 
$
—

 
$
171,820

Collectively evaluated
4,160,203

 
1,542,269

 
4,354,288

 
879,771

 
433,684

 
11,370,215

Total
$
4,184,960

 
$
1,656,360

 
$
4,386,803

 
$
880,228

 
$
433,684

 
$
11,542,035

December 31, 2015
 
 
 
 
 
 
 
 
 
 
 
Individually evaluated
$
22,860

 
$
21,139

 
$
32,994

 
$
485

 
$
—

 
$
77,478

Collectively evaluated
4,097,662

 
1,737,056

 
4,259,733

 
880,264

 
434,338

 
11,409,053

Total
$
4,120,522

 
$
1,758,195

 
$
4,292,727

 
$
880,749

 
$
434,338

 
$
11,486,531
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 months ended March 31, 2016 and 2015. 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
 
Energy
 
Commercial
Real Estate
 
Consumer
Real Estate
 
Consumer
and Other
 
Total
Three months ended:
 
 
 
 
 
 
 
 
 
 
 
March 31, 2016
 
 
 
 
 
 
 
 
 
 
 
Beginning balance
$
42,993

 
$
54,696

 
$
24,313

 
$
4,659

 
$
9,198

 
$
135,859

Provision for loan losses
3,223

 
31,288

 
(794
)
 
(972
)
 
(4,245
)
 
28,500

Charge-offs
(1,861
)
 
(1,011
)
 
(28
)
 
(154
)
 
(2,724
)
 
(5,778
)
Recoveries
729

 
—

 
96

 
253

 
2,221

 
3,299

Net charge-offs
(1,132
)
 
(1,011
)
 
68

 
99

 
(503
)
 
(2,479
)
Ending balance
$
45,084

 
$
84,973

 
$
23,587

 
$
3,786

 
$
4,450

 
$
161,880

March 31, 2015
 
 
 
 
 
 
 
 
 
 
 
Beginning balance
$
44,273

 
$
14,919

 
$
27,163

 
$
5,178

 
$
8,009

 
$
99,542

Provision for loan losses
346

 
6,025

 
248

 
(243
)
 
1,786

 
8,162

Charge-offs
(2,132
)
 
—

 
(478
)
 
(80
)
 
(2,805
)
 
(5,495
)
Recoveries
1,280

 
2

 
172

 
52

 
1,993

 
3,499

Net charge-offs
(852
)
 
2

 
(306
)
 
(28
)
 
(812
)
 
(1,996
)
Ending balance
$
43,767

 
$
20,946

 
$
27,105

 
$
4,907

 
$
8,983

 
$
105,708