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Loans (Tables)
 3 Months Ended
Mar. 31, 2019
Receivables [Abstract]  
Loans Loans were as follows:
 
March 31,
2019
 
Percentage
of Total
 
December 31,
2018
 
Percentage
of Total
Commercial and industrial
$
5,368,271

 
37.3
%
 
$
5,111,957

 
36.3
%
Energy:
 
 
 
 
 
 
 
Production
1,278,366

 
8.9

 
1,309,314

 
9.3

Service
166,649

 
1.2

 
168,775

 
1.2

Other
114,058

 
0.7

 
124,509

 
0.9

Total energy
1,559,073

 
10.8

 
1,602,598

 
11.4

Commercial real estate:
 
 
 
 
 
 
 
Commercial mortgages
4,256,999

 
29.6

 
4,121,966

 
29.2

Construction
1,244,567

 
8.6

 
1,267,717

 
9.0

Land
311,629

 
2.2

 
306,755

 
2.2

Total commercial real estate
5,813,195

 
40.4

 
5,696,438

 
40.4

Consumer real estate:
 
 
 
 
 
 
 
Home equity loans
351,762

 
2.4

 
353,924

 
2.5

Home equity lines of credit
337,312

 
2.3

 
337,168

 
2.4

Other
438,678

 
3.1

 
427,898

 
3.0

Total consumer real estate
1,127,752

 
7.8

 
1,118,990

 
7.9

Total real estate
6,940,947

 
48.2

 
6,815,428

 
48.3

Consumer and other
538,048

 
3.7

 
569,750

 
4.0

Total loans
$
14,406,339

 
100.0
%
 
$
14,099,733

 
100.0
%
Non-Accrual Loans, Segregated by Class of Loans Non-accrual loans, segregated by class of loans, were as follows:
 
March 31,
2019
 
December 31,
2018
Commercial and industrial
$
16,035

 
$
9,239

Energy
45,673

 
46,932

Commercial real estate:
 
 
 
Buildings, land and other
26,760

 
15,268

Construction
410

 
—

Consumer real estate
1,860

 
892

Consumer and other
1,424

 
1,408

Total
$
92,162

 
$
73,739
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, 2019 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
$
24,572

 
$
15,675

 
$
40,247

 
$
5,328,024

 
$
5,368,271

 
$
7,377

Energy
10,151

 
1,766

 
11,917

 
1,547,156

 
1,559,073

 
1,221

Commercial real estate:
 
 
 
 
 
 
 
 
 
 
 
Buildings, land and other
22,223

 
12,580

 
34,803

 
4,533,825

 
4,568,628

 
2,273

Construction
6,173

 
410

 
6,583

 
1,237,984

 
1,244,567

 
—

Consumer real estate
7,331

 
2,207

 
9,538

 
1,118,214

 
1,127,752

 
1,794

Consumer and other
7,143

 
2,532

 
9,675

 
528,373

 
538,048

 
1,124

Total
$
77,593

 
$
35,170

 
$
112,763

 
$
14,293,576

 
$
14,406,339

 
$
13,789
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, 2019
 
 
 
 
 
 
 
 
 
Commercial and industrial
$
15,281

 
$
3,554

 
$
10,647

 
$
14,201

 
$
6,698

Energy
66,754

 
6,342

 
39,131

 
45,473

 
8,996

Commercial real estate:
 
 
 
 
 
 

 
 
Buildings, land and other
27,491

 
12,236

 
14,086

 
26,322

 
2,855

Construction
430

 
410

 
—

 
410

 
—

Consumer real estate
1,285

 
1,285

 
—

 
1,285

 
—

Consumer and other
1,492

 
—

 
1,424

 
1,424

 
1,424

Total
$
112,733

 
$
23,827

 
$
65,288

 
$
89,115

 
$
19,973

December 31, 2018
 
 
 
 
 
 
 
 
 
Commercial and industrial
$
9,094

 
$
2,842

 
$
4,287

 
$
7,129

 
$
2,558

Energy
67,900

 
6,817

 
39,890

 
46,707

 
9,671

Commercial real estate:
 
 
 
 
 
 
 
 
 
Buildings, land and other
15,774

 
2,168

 
12,517

 
14,685

 
2,599

Construction
—

 
—

 
—

 
—

 
—

Consumer real estate
293

 
293

 
—

 
293

 
—

Consumer and other
1,475

 
—

 
1,407

 
1,407

 
1,407

Total
$
94,536

 
$
12,120

 
$
58,101

 
$
70,221

 
$
16,235
Average Recorded Investment In Impaired Loans The average recorded investment in impaired loans was as follows:
 
Three Months Ended 
 March 31,
 
2019

2018
Commercial and industrial
$
10,665

 
$
29,496

Energy
46,090

 
99,657

Commercial real estate:
 
 
 
Buildings, land and other
20,504

 
8,009

Construction
205

 
—

Consumer real estate
789

 
1,321

Consumer and other
1,416

 
—

Total
$
79,669

 
$
138,483
Troubled Debt Restructurings Troubled debt restructurings during the three months ended March 31, 2019 and March 31, 2018 are set forth in the following table.
 
Three Months Ended 
 March 31, 2019
 
Three Months Ended 
 March 31, 2018
 
Balance at
Restructure
 
Balance at
Period-End
 
Balance at
Restructure
 
Balance at
Period-End
Commercial and industrial
$
307

 
$
293

 
$
2,203

 
$
2,171

Energy
—

 
—

 
13,708

 
12,058

Commercial real estate:
 
 
 
 
 
 
 
Buildings, land and other
5,901

 
5,898

 
—

 
—

 
$
6,208

 
$
6,191

 
$
15,911

 
$
14,229
Restructured Loans Past Due in Excess of 90 Days on Financing Receivables Additional information related to restructured loans as of or for the three months ended March 31, 2019 and March 31, 2018 is set forth in the following table.
 
March 31, 2019
 
March 31, 2018
Restructured loans past due in excess of 90 days at period-end:
 
 
 
Number of loans
4

 
—

Dollar amount of loans
$
2,367

 
$
—

Restructured loans on non-accrual status at period end
2,162

 
2,171

Charge-offs of restructured loans:
 
 
 
Recognized in connection with restructuring
—

 
—

Recognized on previously restructured loans
—

 
1,650
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, 2019
 
December 31, 2018
 
Weighted
Average
Risk Grade
 
Loans
 
Weighted
Average
Risk Grade
 
Loans
Commercial and industrial:
 
 
 
 
 
 
 
Risk grades 1-8
6.08

 
$
5,024,023

 
6.12

 
$
4,862,275

Risk grade 9
9.00

 
182,286

 
9.00

 
112,431

Risk grade 10
10.00

 
51,968

 
10.00

 
58,328

Risk grade 11
11.00

 
93,960

 
11.00

 
69,684

Risk grade 12
12.00

 
9,336

 
12.00

 
6,681

Risk grade 13
13.00

 
6,698

 
13.00

 
2,558

Total
6.33

 
$
5,368,271

 
6.30

 
$
5,111,957

Energy
 
 
 
 
 
 
 
Risk grades 1-8
5.77

 
$
1,358,199

 
5.76

 
$
1,451,673

Risk grade 9
9.00

 
81,621

 
9.00

 
35,565

Risk grade 10
10.00

 
35,056

 
10.00

 
43,001

Risk grade 11
11.00

 
38,524

 
11.00

 
25,427

Risk grade 12
12.00

 
36,677

 
12.00

 
37,261

Risk grade 13
13.00

 
8,996

 
13.00

 
9,671

Total
6.35

 
$
1,559,073

 
6.22

 
$
1,602,598

Commercial real estate:
 
 

 
 
 
 
Buildings, land and other
 
 
 
 
 
 
 
Risk grades 1-8
6.78

 
$
4,280,730

 
6.76

 
$
4,143,264

Risk grade 9
9.00

 
111,496

 
9.00

 
109,660

Risk grade 10
10.00

 
62,315

 
10.00

 
62,353

Risk grade 11
11.00

 
87,327

 
11.00

 
98,176

Risk grade 12
12.00

 
23,905

 
12.00

 
12,669

Risk grade 13
13.00

 
2,855

 
13.00

 
2,599

Total
6.99

 
$
4,568,628

 
6.98

 
$
4,428,721

Construction
 
 
 
 
 
 
 
Risk grades 1-8
7.15

 
$
1,176,243

 
7.13

 
$
1,177,260

Risk grade 9
9.00

 
49,728

 
9.00

 
60,754

Risk grade 10
10.00

 
13,869

 
10.00

 
24,877

Risk grade 11
11.00

 
4,317

 
11.00

 
4,826

Risk grade 12
12.00

 
410

 
12.00

 
—

Risk grade 13
13.00

 
—

 
13.00

 
—

Total
7.27

 
$
1,244,567

 
7.29

 
$
1,267,717
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,
 
2019
 
2018
Commercial and industrial
$
(1,938
)
 
$
(7,675
)
Energy
47

 
(2,849
)
Commercial real estate:
 
 
 
Buildings, land and other
27

 
81

Construction
3

 
2

Consumer real estate
(1,689
)
 
(526
)
Consumer and other
(3,235
)
 
(1,457
)
Total
$
(6,785
)
 
$
(12,424
)
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, 2019 and December 31, 2018 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, 2019
 
 
 
 
 
 
 
 
 
 
 
Historical valuation allowances
$
31,431

 
$
9,293

 
$
20,576

 
$
2,571

 
$
7,699

 
$
71,570

Specific valuation allowances
6,698

 
8,996

 
2,855

 
—

 
1,424

 
19,973

General valuation allowances
10,870

 
4,200

 
3,812

 
1,654

 
(84
)
 
20,452

Macroeconomic valuation allowances
9,572

 
2,854

 
9,212

 
1,436

 
1,281

 
24,355

Total
$
58,571

 
$
25,343

 
$
36,455

 
$
5,661

 
$
10,320

 
$
136,350

Allocated to loans:
 
 
 
 
 
 
 
 
 
 
 
Individually evaluated
$
6,698

 
$
8,996

 
$
2,855

 
$
—

 
$
1,424

 
$
19,973

Collectively evaluated
51,873

 
16,347

 
33,600

 
5,661

 
8,896

 
116,377

Total
$
58,571

 
$
25,343

 
$
36,455

 
$
5,661

 
$
10,320

 
$
136,350

December 31, 2018
 
 
 
 
 
 
 
 
 
 
 
Historical valuation allowances
$
25,351

 
$
9,697

 
$
20,817

 
$
2,688

 
$
6,845

 
$
65,398

Specific valuation allowances
2,558

 
9,671

 
2,599

 
—

 
1,407

 
16,235

General valuation allowances
10,062

 
6,014

 
4,366

 
1,671

 
(13
)
 
22,100

Macroeconomic valuation allowances
10,609

 
3,670

 
10,995

 
1,744

 
1,381

 
28,399

Total
$
48,580

 
$
29,052

 
$
38,777

 
$
6,103

 
$
9,620

 
$
132,132

Allocated to loans:
 
 
 
 
 
 
 
 
 
 
 
Individually evaluated
$
2,558

 
$
9,671

 
$
2,599

 
$
—

 
$
1,407

 
$
16,235

Collectively evaluated
46,022

 
19,381

 
36,178

 
6,103

 
8,213

 
115,897

Total
$
48,580

 
$
29,052

 
$
38,777

 
$
6,103

 
$
9,620

 
$
132,132
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, 2019 and December 31, 2018 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, 2019
 
 
 
 
 
 
 
 
 
 
 
Individually evaluated
$
14,201

 
$
45,473

 
$
26,732

 
$
1,285

 
$
1,424

 
$
89,115

Collectively evaluated
5,354,070

 
1,513,600

 
5,786,463

 
1,126,467

 
536,624

 
14,317,224

Total
$
5,368,271

 
$
1,559,073

 
$
5,813,195

 
$
1,127,752

 
$
538,048

 
$
14,406,339

December 31, 2018
 
 
 
 
 
 
 
 
 
 
 
Individually evaluated
$
7,129

 
$
46,707

 
$
14,685

 
$
293

 
$
1,407

 
$
70,221

Collectively evaluated
5,104,828

 
1,555,891

 
5,681,753

 
1,118,697

 
568,343

 
14,029,512

Total
$
5,111,957

 
$
1,602,598

 
$
5,696,438

 
$
1,118,990

 
$
569,750

 
$
14,099,733
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, 2019 and 2018. 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, 2019
 
 
 
 
 
 
 
 
 
 
 
Beginning balance
$
48,580

 
$
29,052

 
$
38,777

 
$
6,103

 
$
9,620

 
$
132,132

Provision for loan losses
11,929

 
(3,756
)
 
(2,352
)
 
1,247

 
3,935

 
11,003

Charge-offs
(2,688
)
 
—

 
(60
)
 
(1,778
)
 
(5,697
)
 
(10,223
)
Recoveries
750

 
47

 
90

 
89

 
2,462

 
3,438

Net charge-offs
(1,938
)
 
47

 
30

 
(1,689
)
 
(3,235
)
 
(6,785
)
Ending balance
$
58,571

 
$
25,343

 
$
36,455

 
$
5,661

 
$
10,320

 
$
136,350

March 31, 2018
 
 
 
 
 
 
 
 
 
 
 
Beginning balance
$
59,614

 
$
51,528

 
$
30,948

 
$
5,657

 
$
7,617

 
$
155,364

Provision for loan losses
5,794

 
(9,640
)
 
7,443

 
1,218

 
2,130

 
6,945

Charge-offs
(9,252
)
 
(2,850
)
 
(5
)
 
(719
)
 
(3,972
)
 
(16,798
)
Recoveries
1,577

 
1

 
88

 
193

 
2,515

 
4,374

Net charge-offs
(7,675
)
 
(2,849
)
 
83

 
(526
)
 
(1,457
)
 
(12,424
)
Ending balance
$
57,733

 
$
39,039

 
$
38,474

 
$
6,349

 
$
8,290

 
$
149,885