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Loans (Tables)
 6 Months Ended
Jun. 30, 2019
Receivables [Abstract]  
Loans
Loans were as follows:
 
June 30,
2019
 
Percentage
of Total
 
December 31,
2018
 
Percentage
of Total
Commercial and industrial
$
5,380,487

 
37.2
%
 
$
5,111,957

 
36.3
%
Energy:
 
 
 
 
 
 
 
Production
1,197,717

 
8.3

 
1,309,314

 
9.3

Service
173,473

 
1.2

 
168,775

 
1.2

Other
110,159

 
0.7

 
124,509

 
0.9

Total energy
1,481,349

 
10.2

 
1,602,598

 
11.4

Commercial real estate:
 
 
 
 
 
 
 
Commercial mortgages
4,291,781

 
29.7

 
4,121,966

 
29.2

Construction
1,323,040

 
9.2

 
1,267,717

 
9.0

Land
299,435

 
2.1

 
306,755

 
2.2

Total commercial real estate
5,914,256

 
41.0

 
5,696,438

 
40.4

Consumer real estate:
 
 
 
 
 
 
 
Home equity loans
356,754

 
2.5

 
353,924

 
2.5

Home equity lines of credit
349,061

 
2.4

 
337,168

 
2.4

Other
453,083

 
3.1

 
427,898

 
3.0

Total consumer real estate
1,158,898

 
8.0

 
1,118,990

 
7.9

Total real estate
7,073,154

 
49.0

 
6,815,428

 
48.3

Consumer and other
524,159

 
3.6

 
569,750

 
4.0

Total loans
$
14,459,149

 
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:
 
June 30,
2019
 
December 31,
2018
Commercial and industrial
$
18,768

 
$
9,239

Energy
40,228

 
46,932

Commercial real estate:
 
 
 
Buildings, land and other
10,437

 
15,268

Construction
—

 
—

Consumer real estate
669

 
892

Consumer and other
1,419

 
1,408

Total
$
71,521

 
$
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 June 30, 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
$
28,577

 
$
18,751

 
$
47,328

 
$
5,333,159

 
$
5,380,487

 
$
6,823

Energy
3,546

 
20

 
3,566

 
1,477,783

 
1,481,349

 
20

Commercial real estate:
 
 
 
 
 
 
 
 
 
 
 
Buildings, land and other
13,516

 
8,470

 
21,986

 
4,569,230

 
4,591,216

 
4,808

Construction
14,425

 
774

 
15,199

 
1,307,841

 
1,323,040

 
774

Consumer real estate
9,237

 
1,610

 
10,847

 
1,148,051

 
1,158,898

 
1,191

Consumer and other
5,015

 
2,105

 
7,120

 
517,039

 
524,159

 
2,031

Total
$
74,316

 
$
31,730

 
$
106,046

 
$
14,353,103

 
$
14,459,149

 
$
15,647
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
June 30, 2019
 
 
 
 
 
 
 
 
 
Commercial and industrial
$
18,536

 
$
4,455

 
$
12,267

 
$
16,722

 
$
6,276

Energy
55,043

 
5,866

 
33,946

 
39,812

 
9,721

Commercial real estate:
 
 
 
 
 
 

 
 
Buildings, land and other
10,329

 
5,196

 
4,760

 
9,956

 
1,420

Construction
—

 
—

 
—

 
—

 
—

Consumer real estate
293

 
293

 
—

 
293

 
—

Consumer and other
1,532

 
—

 
1,419

 
1,419

 
1,419

Total
$
85,733

 
$
15,810

 
$
52,392

 
$
68,202

 
$
18,836

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 
 June 30,
 
Six Months Ended 
 June 30,
 
2019
 
2018
 
2019

2018
Commercial and industrial
$
15,462

 
$
15,307

 
$
12,684

 
$
24,791

Energy
42,643

 
92,380

 
43,997

 
93,001

Commercial real estate:
 
 
 
 
 
 
 
Buildings, land and other
18,139

 
13,867

 
16,988

 
11,376

Construction
205

 
—

 
137

 
—

Consumer real estate
789

 
860

 
624

 
978

Consumer and other
1,422

 
813

 
1,417

 
542

Total
$
78,660

 
$
123,227

 
$
75,847

 
$
130,688
Troubled Debt Restructurings Troubled debt restructurings during the six months ended June 30, 2019 and June 30, 2018 are set forth in the following table.
 
Six Months Ended 
 June 30, 2019
 
Six Months Ended 
 June 30, 2018
 
Balance at
Restructure
 
Balance at
Period-End
 
Balance at
Restructure
 
Balance at
Period-End
Commercial and industrial
$
677

 
$
555

 
$
2,203

 
$
843

Energy
—

 
—

 
13,708

 
—

Commercial real estate:
 
 
 
 
 
 
 
Buildings, land and other
7,347

 
7,308

 
—

 
—

 
$
8,024

 
$
7,863

 
$
15,911

 
$
843
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 June 30, 2019 and June 30, 2018 is set forth in the following table.
 
June 30, 2019
 
June 30, 2018
Restructured loans past due in excess of 90 days at period-end:
 
 
 
Number of loans
—

 
—

Dollar amount of loans
$
—

 
$
—

Restructured loans on non-accrual status at period end
3,890

 
843

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

 
—

Recognized on previously restructured loans
—

 
1,650

Proceeds from sale of restructured loans
—

 
13,350
Weighted Average Risk Grades for All Commercial Loans by Class
The following tables present weighted-average risk grades for all commercial loans by class.
 
June 30, 2019
 
December 31, 2018
 
Weighted
Average
Risk Grade
 
Loans
 
Weighted
Average
Risk Grade
 
Loans
Commercial and industrial:
 
 
 
 
 
 
 
Risk grades 1-8
6.13

 
$
5,024,193

 
6.12

 
$
4,862,275

Risk grade 9
9.00

 
200,167

 
9.00

 
112,431

Risk grade 10
10.00

 
43,269

 
10.00

 
58,328

Risk grade 11
11.00

 
94,090

 
11.00

 
69,684

Risk grade 12
12.00

 
12,492

 
12.00

 
6,681

Risk grade 13
13.00

 
6,276

 
13.00

 
2,558

Total
6.37

 
$
5,380,487

 
6.30

 
$
5,111,957

Energy
 
 
 
 
 
 
 
Risk grades 1-8
5.81

 
$
1,305,553

 
5.76

 
$
1,451,673

Risk grade 9
9.00

 
82,176

 
9.00

 
35,565

Risk grade 10
10.00

 
2,061

 
10.00

 
43,001

Risk grade 11
11.00

 
51,331

 
11.00

 
25,427

Risk grade 12
12.00

 
30,507

 
12.00

 
37,261

Risk grade 13
13.00

 
9,721

 
13.00

 
9,671

Total
6.35

 
$
1,481,349

 
6.22

 
$
1,602,598

Commercial real estate:
 
 

 
 
 
 
Buildings, land and other
 
 
 
 
 
 
 
Risk grades 1-8
6.76

 
$
4,290,833

 
6.76

 
$
4,143,264

Risk grade 9
9.00

 
128,068

 
9.00

 
109,660

Risk grade 10
10.00

 
76,686

 
10.00

 
62,353

Risk grade 11
11.00

 
85,192

 
11.00

 
98,176

Risk grade 12
12.00

 
9,017

 
12.00

 
12,669

Risk grade 13
13.00

 
1,420

 
13.00

 
2,599

Total
6.97

 
$
4,591,216

 
6.98

 
$
4,428,721

Construction
 
 
 
 
 
 
 
Risk grades 1-8
7.17

 
$
1,271,280

 
7.13

 
$
1,177,260

Risk grade 9
9.00

 
35,453

 
9.00

 
60,754

Risk grade 10
10.00

 
13,355

 
10.00

 
24,877

Risk grade 11
11.00

 
2,952

 
11.00

 
4,826

Risk grade 12
12.00

 
—

 
12.00

 
—

Risk grade 13
13.00

 
—

 
13.00

 
—

Total
7.26

 
$
1,323,040

 
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 
 June 30,
 
Six Months Ended 
 June 30,
 
2019
 
2018
 
2019
 
2018
Commercial and industrial
$
(2,454
)
 
$
(3,548
)
 
$
(4,392
)
 
$
(11,223
)
Energy
(1,971
)
 
(2,076
)
 
(1,924
)
 
(4,925
)
Commercial real estate:
 
 
 
 
 
 
 
Buildings, land and other
(531
)
 
(402
)
 
(504
)
 
(321
)
Construction
3

 
6

 
6

 
8

Consumer real estate
(286
)
 
(164
)
 
(1,975
)
 
(690
)
Consumer and other
(2,582
)
 
(1,726
)
 
(5,817
)
 
(3,183
)
Total
$
(7,821
)
 
$
(7,910
)
 
$
(14,606
)
 
$
(20,334
)
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 June 30, 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
June 30, 2019
 
 
 
 
 
 
 
 
 
 
 
Historical valuation allowances
$
31,699

 
$
9,087

 
$
20,979

 
$
2,619

 
$
7,592

 
$
71,976

Specific valuation allowances
6,276

 
9,721

 
1,420

 
—

 
1,419

 
18,836

General valuation allowances
10,227

 
4,487

 
4,105

 
1,560

 
(397
)
 
19,982

Macroeconomic valuation allowances
9,512

 
2,523

 
9,410

 
1,458

 
1,232

 
24,135

Total
$
57,714

 
$
25,818

 
$
35,914

 
$
5,637

 
$
9,846

 
$
134,929

Allocated to loans:
 
 
 
 
 
 
 
 
 
 
 
Individually evaluated
$
6,276

 
$
9,721

 
$
1,420

 
$
—

 
$
1,419

 
$
18,836

Collectively evaluated
51,438

 
16,097

 
34,494

 
5,637

 
8,427

 
116,093

Total
$
57,714

 
$
25,818

 
$
35,914

 
$
5,637

 
$
9,846

 
$
134,929

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 June 30, 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
June 30, 2019
 
 
 
 
 
 
 
 
 
 
 
Individually evaluated
$
16,722

 
$
39,812

 
$
9,956

 
$
293

 
$
1,419

 
$
68,202

Collectively evaluated
5,363,765

 
1,441,537

 
5,904,300

 
1,158,605

 
522,740

 
14,390,947

Total
$
5,380,487

 
$
1,481,349

 
$
5,914,256

 
$
1,158,898

 
$
524,159

 
$
14,459,149

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 and six months ended June 30, 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:
 
 
 
 
 
 
 
 
 
 
 
June 30, 2019
 
 
 
 
 
 
 
 
 
 
 
Beginning balance
$
58,571

 
$
25,343

 
$
36,455

 
$
5,661

 
$
10,320

 
$
136,350

Provision for loan losses
1,597

 
2,446

 
(13
)
 
262

 
2,108

 
6,400

Charge-offs
(3,389
)
 
(2,000
)
 
(557
)
 
(601
)
 
(5,103
)
 
(11,650
)
Recoveries
935

 
29

 
29

 
315

 
2,521

 
3,829

Net charge-offs
(2,454
)
 
(1,971
)
 
(528
)
 
(286
)
 
(2,582
)
 
(7,821
)
Ending balance
$
57,714

 
$
25,818

 
$
35,914

 
$
5,637

 
$
9,846

 
$
134,929

June 30, 2018
 
 
 
 
 
 
 
 
 
 
 
Beginning balance
$
57,733

 
$
39,039

 
$
38,474

 
$
6,349

 
$
8,290

 
$
149,885

Provision for loan losses
3,528

 
350

 
840

 
151

 
3,382

 
8,251

Charge-offs
(4,153
)
 
(2,689
)
 
(614
)
 
(482
)
 
(3,994
)
 
(11,932
)
Recoveries
605

 
613

 
218

 
318

 
2,268

 
4,022

Net charge-offs
(3,548
)
 
(2,076
)
 
(396
)
 
(164
)
 
(1,726
)
 
(7,910
)
Ending balance
$
57,713

 
$
37,313

 
$
38,918

 
$
6,336

 
$
9,946

 
$
150,226

 
 
 
 
 
 
 
 
 
 
 
 
Six months ended:
 
 
 
 
 
 
 
 
 
 
 
June 30, 2019
 
 
 
 
 
 
 
 
 
 
 
Beginning balance
$
48,580

 
$
29,052

 
$
38,777

 
$
6,103

 
$
9,620

 
$
132,132

Provision for loan losses
13,526

 
(1,310
)
 
(2,365
)
 
1,509

 
6,043

 
17,403

Charge-offs
(6,077
)
 
(2,000
)
 
(617
)
 
(2,379
)
 
(10,800
)
 
(21,873
)
Recoveries
1,685

 
76

 
119

 
404

 
4,983

 
7,267

Net charge-offs
(4,392
)
 
(1,924
)
 
(498
)
 
(1,975
)
 
(5,817
)
 
(14,606
)
Ending balance
$
57,714

 
$
25,818

 
$
35,914

 
$
5,637

 
$
9,846

 
$
134,929

June 30, 2018
 
 
 
 
 
 
 
 
 
 
 
Beginning balance
$
59,614

 
$
51,528

 
$
30,948

 
$
5,657

 
$
7,617

 
$
155,364

Provision for loan losses
9,322

 
(9,290
)
 
8,283

 
1,369

 
5,512

 
15,196

Charge-offs
(13,405
)
 
(5,539
)
 
(619
)
 
(1,201
)
 
(7,966
)
 
(28,730
)
Recoveries
2,182

 
614

 
306

 
511

 
4,783

 
8,396

Net charge-offs
(11,223
)
 
(4,925
)
 
(313
)
 
(690
)
 
(3,183
)
 
(20,334
)
Ending balance
$
57,713

 
$
37,313

 
$
38,918

 
$
6,336

 
$
9,946

 
$
150,226