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Loans and Allowances for Credit Losses (Tables)
 12 Months Ended
Dec. 31, 2019
Loans and Leases Receivable, Net Amount [Abstract]  
Schedule of the Loans by Portfolio Segment [Table Text Block]

The portfolio segments of the loan portfolio are as follows (in thousands):

 
 
December 31, 2019
 
December 31, 2018
 
 
Fixed
Rate
 
Variable
Rate
 
Non-accrual
 
Total
 
Fixed
Rate
 
Variable
Rate
 
Non-accrual
 
Total
Commercial
 
$
3,231,485

 
$
10,684,749

 
$
115,416

 
$
14,031,650

 
$
2,251,188

 
$
11,285,049

 
$
99,841

 
$
13,636,078

Commercial real estate
 
1,056,321

 
3,349,836

 
27,626

 
4,433,783

 
1,477,274

 
3,265,918

 
21,621

 
4,764,813

Residential mortgage
 
1,652,653

 
393,897

 
37,622

 
2,084,172

 
1,830,224

 
358,254

 
41,555

 
2,230,033

Personal
 
193,903

 
1,007,192

 
287

 
1,201,382

 
190,687

 
834,889

 
230

 
1,025,806

Total
 
$
6,134,362

 
$
15,435,674

 
$
180,951

 
$
21,750,987

 
$
5,749,373

 
$
15,744,110

 
$
163,247

 
$
21,656,730

Accruing loans past due (90 days)1
 
 

 
 

 
 

 
$
7,680

 
 

 
 

 
 

 
$
1,338

Foregone interest on nonaccrual loans
 
 
 
 
 
 
 
$
17,409

 
 
 
 
 
 
 
$
15,502

1 
Excludes residential mortgage loans guaranteed by agencies of the U.S. government
Rollforward of Allowance For Loan Losses And Accrual for Off-Balnace Sheet Credit Losses [Table Text Block]
The activity in the allowance for loan losses and the accrual for off-balance sheet credit risk related to loan commitments and standby letters of credit for the year ended December 31, 2019 is summarized as follows (in thousands):
 
 
Commercial
 
Commercial Real Estate
 
Residential Mortgage
 
Personal
 
Nonspecific Allowance
 
Total
Allowance for loan losses:
 
 
 
 
 
 
 
 
 
 
 
 
Beginning balance
 
$
102,226

 
$
60,026

 
$
17,964

 
$
9,473

 
$
17,768

 
$
207,457

Provision for loan losses
 
57,125

 
(12,046
)
 
(3,838
)
 
3,537

 
(573
)
 
44,205

Loans charged off
 
(43,185
)
 
(1,161
)
 
(288
)
 
(6,343
)
 
—

 
(50,977
)
Recoveries
 
2,021

 
4,986

 
562

 
2,505

 
—

 
10,074

Ending balance
 
$
118,187

 
$
51,805

 
$
14,400

 
$
9,172

 
$
17,195

 
$
210,759

 
 
 
 
 
 
 
 
 
 
 
 
 
Accrual for off-balance sheet credit risk:
 
 

 
 

 
 

 
 

 
 

 
 

Beginning balance
 
$
1,655

 
$
52

 
$
52

 
$
31

 
$
—

 
$
1,790

Provision for off-balance sheet credit risk
 
(221
)
 
55

 
(8
)
 
(31
)
 
—

 
(205
)
Ending balance
 
$
1,434

 
$
107

 
$
44

 
$
—

 
$
—

 
$
1,585

 
 
 
 
 
 
 
 
 
 
 
 
 
Total provision for credit losses
 
$
56,904

 
$
(11,991
)
 
$
(3,846
)
 
$
3,506

 
$
(573
)
 
$
44,000




The activity in the allowance for loan losses and the accrual for off-balance sheet credit risk related to loan commitments and standby letters of credit for the year ended December 31, 2018 is summarized as follows (in thousands):

 
 
Commercial
 
Commercial Real Estate
 
Residential Mortgage
 
Personal
 
Nonspecific Allowance
 
Total
Allowance for loan losses:
 
 
 
 
 
 
 
 
 
 
 
 
Beginning balance
 
$
124,269

 
$
56,621

 
$
18,451

 
$
9,124

 
$
22,217

 
$
230,682

Provision for loan losses
 
12,521

 
(147
)
 
(1,156
)
 
3,175

 
(4,449
)
 
9,944

Loans charged off
 
(37,880
)
 
—

 
(378
)
 
(5,325
)
 
—

 
(43,583
)
Recoveries
 
3,316

 
3,552

 
1,047

 
2,499

 
—

 
10,414

Ending balance
 
$
102,226

 
$
60,026

 
$
17,964

 
$
9,473

 
$
17,768

 
$
207,457

 
 
 
 
 
 
 
 
 
 
 
 
 
Accrual for off-balance sheet credit risk:
 
 

 
 

 
 

 
 

 
 

 
 

Beginning balance
 
$
3,644

 
$
45

 
$
43

 
$
2

 
$
—

 
$
3,734

Provision for off-balance sheet credit risk
 
(1,989
)
 
7

 
9

 
29

 
—

 
(1,944
)
Ending balance
 
$
1,655

 
$
52

 
$
52

 
$
31

 
$
—

 
$
1,790

 
 
 
 
 
 
 
 
 
 
 
 
 
Total provision for credit losses
 
$
10,532

 
$
(140
)
 
$
(1,147
)
 
$
3,204

 
$
(4,449
)
 
$
8,000



The activity in the allowance for loan losses and the accrual for off-balance sheet credit risk related to loan commitments and standby letters of credit for the year ended December 31, 2017 is summarized as follows (in thousands):

 
 
Commercial
 
Commercial Real Estate
 
Residential Mortgage
 
Personal
 
Nonspecific Allowance
 
Total
Allowance for loan losses:
 
 
 
 
 
 
 
 
 
 
 
 
Beginning balance
 
$
140,213

 
$
50,749

 
$
18,224

 
$
8,773

 
$
28,200

 
$
246,159

Provision for loan losses
 
(595
)
 
4,008

 
116

 
2,964

 
(5,983
)
 
510

Loans charged off
 
(19,810
)
 
(76
)
 
(649
)
 
(5,064
)
 
—

 
(25,599
)
Recoveries
 
4,461

 
1,940

 
760

 
2,451

 
—

 
9,612

Ending balance
 
$
124,269

 
$
56,621

 
$
18,451

 
$
9,124

 
$
22,217

 
$
230,682

 
 
 
 
 
 
 
 
 
 
 
 
 
Accrual for off-balance sheet credit risk:
 
 

 
 

 
 

 
 

 
 

 
 

Beginning balance
 
$
11,063

 
$
123

 
$
50

 
$
8

 
$
—

 
$
11,244

Provision for off-balance sheet credit risk
 
(7,419
)
 
(78
)
 
(7
)
 
(6
)
 
—

 
(7,510
)
Ending balance
 
$
3,644

 
$
45

 
$
43

 
$
2

 
$
—

 
$
3,734

 
 
 
 
 
 
 
 
 
 
 
 
 
Total provision for credit losses
 
$
(8,014
)
 
$
3,930

 
$
109

 
$
2,958

 
$
(5,983
)
 
$
(7,000
)





The allowance for loan losses and recorded investment of the related loans by portfolio segment for each impairment measurement method at December 31, 2019 is as follows (in thousands):

 
 
Collectively Measured
for Impairment
 
Individually Measured
for Impairment
 
Total
 
 
Recorded Investment
 
Related Allowance
 
Recorded Investment
 
Related Allowance
 
Recorded Investment
 
Related
Allowance
Commercial
 
$
13,916,234

 
$
100,773

 
$
115,416

 
$
17,414

 
$
14,031,650

 
$
118,187

Commercial real estate
 
4,406,157

 
51,805

 
27,626

 
—

 
4,433,783

 
51,805

Residential mortgage
 
2,046,550

 
14,400

 
37,622

 
—

 
2,084,172

 
14,400

Personal
 
1,201,095

 
9,172

 
287

 
—

 
1,201,382

 
9,172

Total
 
21,570,036

 
176,150

 
180,951

 
17,414

 
21,750,987

 
193,564

 
 
 
 
 
 
 
 
 
 
 
 
 
Nonspecific allowance
 
—

 
—

 
—

 
—

 
—

 
17,195

 
 
 
 
 
 
 
 
 
 
 
 
 
Total
 
$
21,570,036

 
$
176,150

 
$
180,951

 
$
17,414

 
$
21,750,987

 
$
210,759



The allowance for loan losses and recorded investment of the related loans by portfolio segment for each impairment measurement method at December 31, 2018 is as follows (in thousands):

 
 
Collectively Measured
for Impairment
 
Individually Measured
for Impairment
 
Total
 
 
Recorded Investment
 
Related Allowance
 
Recorded Investment
 
Related Allowance
 
Recorded Investment
 
Related
Allowance
Commercial
 
$
13,536,237

 
$
93,494

 
$
99,841

 
$
8,732

 
$
13,636,078

 
$
102,226

Commercial real estate
 
4,743,192

 
60,026

 
21,621

 
—

 
4,764,813

 
60,026

Residential mortgage
 
2,188,478

 
17,964

 
41,555

 
—

 
2,230,033

 
17,964

Personal
 
1,025,576

 
9,473

 
230

 
—

 
1,025,806

 
9,473

Total
 
21,493,483

 
180,957

 
163,247

 
8,732

 
21,656,730

 
189,689

 
 
 
 
 
 
 
 
 
 
 
 
 
Nonspecific allowance
 
—

 
—

 
—

 
—

 
—

 
17,768

 
 
 
 
 
 
 
 
 
 
 
 
 
Total
 
$
21,493,483

 
$
180,957

 
$
163,247

 
$
8,732

 
$
21,656,730

 
$
207,457
Schedule of Credit Quality Indicators [Table Text Block]
The allowance for loan losses and recorded investment of the related loans by portfolio segment for risk graded and non-risk graded loans at December 31, 2019 is as follows (in thousands):

 
 
Internally Risk Graded
 
Non-Graded
 
Total
 
 
Recorded Investment
 
Related Allowance
 
Recorded Investment
 
Related Allowance
 
Recorded Investment
 
Related
Allowance
Commercial
 
$
13,997,538

 
$
117,236

 
$
34,112

 
$
951

 
$
14,031,650

 
$
118,187

Commercial real estate
 
4,433,783

 
51,805

 
—

 
—

 
4,433,783

 
51,805

Residential mortgage
 
279,113

 
3,085

 
1,805,059

 
11,315

 
2,084,172

 
14,400

Personal
 
1,116,297

 
7,003

 
85,085

 
2,169

 
1,201,382

 
9,172

Total
 
19,826,731

 
179,129

 
1,924,256

 
14,435

 
21,750,987

 
193,564

 
 
 
 
 
 
 
 
 
 
 
 
 
Nonspecific allowance
 
—

 
—

 
—

 
—

 
—

 
17,195

 
 
 
 
 
 
 
 
 
 
 
 
 
Total
 
$
19,826,731

 
$
179,129

 
$
1,924,256

 
$
14,435

 
$
21,750,987

 
$
210,759

 
The allowance for loan losses and recorded investment of the related loans by portfolio segment for risk graded and non-risk graded loans at December 31, 2018 is as follows (in thousands):

 
 
Internally Risk Graded
 
Non-Graded
 
Total
 
 
Recorded Investment
 
Related Allowance
 
Recorded Investment
 
Related Allowance
 
Recorded Investment
 
Related
Allowance
Commercial
 
$
13,586,654

 
$
101,303

 
$
49,424

 
$
923

 
$
13,636,078

 
$
102,226

Commercial real estate
 
4,764,813

 
60,026

 
—

 
—

 
4,764,813

 
60,026

Residential mortgage
 
505,046

 
3,310

 
1,724,987

 
14,654

 
2,230,033

 
17,964

Personal
 
948,890

 
6,633

 
76,916

 
2,840

 
1,025,806

 
9,473

Total
 
19,805,403

 
171,272

 
1,851,327

 
18,417

 
21,656,730

 
189,689

 
 
 
 
 
 
 
 
 
 
 
 
 
Nonspecific allowance
 
—

 
—

 
—

 
—

 
—

 
17,768

 
 
 
 
 
 
 
 
 
 
 
 
 
Total
 
$
19,805,403

 
$
171,272

 
$
1,851,327

 
$
18,417

 
$
21,656,730

 
$
207,457



Loans are considered to be performing if they are in compliance with the original terms of the agreement which is consistent with the regulatory guideline of “pass.” Performing also includes loans considered to be “other loans especially mentioned” by regulatory guidelines and all residential mortgage loans guaranteed by agencies of the U.S. government that continue to accrue interest based on criteria of the guarantor's programs. Other loans especially mentioned are currently performing in compliance with the original terms of the agreement but may have a potential weakness that deserves management's close attention, consistent with regulatory guidelines.

The risk grading process identified certain loans that have a well-defined weakness (e.g. inadequate debt service coverage or liquidity or marginal capitalization; repayment may depend on collateral or other risk mitigation) that may jeopardize liquidation of the debt and represent a greater risk due to deterioration in the financial condition of the borrower. This is consistent with the regulatory guideline for “substandard.” Because the borrowers are still performing in accordance with the original terms of the loan agreements, these loans were not placed in nonaccruing status. 

Nonaccruing loans represent loans for which full collection of principal and interest in accordance with the original terms of the loan agreements is uncertain. This is substantially the same criteria used to determine whether a loan is impaired and includes certain loans considered “substandard” and all loans considered “doubtful” by regulatory guidelines.

The following table summarizes the Company’s loan portfolio at December 31, 2019 by the risk grade categories (in thousands): 
 
 
Internally Risk Graded
 
Non-Graded
 
 
 
 
Performing
 
 
 
 
 
 
 
 
 
 
Pass
 
Other Loans Especially Mentioned
 
Accruing
Substandard
 
Nonaccrual
 
Performing
 
Nonaccrual
 
Total
Commercial:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Energy
 
$
3,700,406

 
$
117,298

 
$
63,951

 
$
91,722

 
$
—

 
$
—

 
$
3,973,377

Services
 
3,050,946

 
29,943

 
33,791

 
7,483

 
—

 
—

 
3,122,163

Wholesale/retail
 
1,749,023

 
5,281

 
5,399

 
1,163

 
—

 
—

 
1,760,866

Manufacturing
 
623,219

 
18,214

 
13,883

 
10,133

 
—

 
—

 
665,449

Healthcare
 
2,995,514

 
13,117

 
20,805

 
4,480

 
—

 
—

 
3,033,916

Public finance
 
709,868

 
—

 
—

 
—

 
—

 
—

 
709,868

Other commercial and industrial
 
709,729

 
4,028

 
17,744

 
398

 
34,075

 
37

 
766,011

Total commercial
 
13,538,705

 
187,881

 
155,573

 
115,379

 
34,075

 
37

 
14,031,650

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial real estate:
 
 

 
 

 
 
 
 

 
 

 
 

 
 

Residential construction and land development
 
150,529

 
—

 
—

 
350

 
—

 
—

 
150,879

Retail
 
743,343

 
12,067

 
1,243

 
18,868

 
—

 
—

 
775,521

Office
 
923,202

 
5,177

 
—

 
—

 
—

 
—

 
928,379

Multifamily
 
1,257,005

 
1,604

 
95

 
6,858

 
—

 
—

 
1,265,562

Industrial
 
852,539

 
1,658

 
1,011

 
909

 
—

 
—

 
856,117

Other commercial real estate
 
455,045

 
1,639

 
—

 
641

 
—

 
—

 
457,325

Total commercial real estate
 
4,381,663

 
22,145

 
2,349

 
27,626

 
—

 
—

 
4,433,783

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Residential mortgage:
 
 

 
 

 
 
 
 

 
 

 
 

 
 

Permanent mortgage
 
276,138

 
78

 
2,404

 
493

 
758,260

 
19,948

 
1,057,321

Permanent mortgages guaranteed by U.S. government agencies
 
—

 
—

 
—

 
—

 
191,694

 
6,100

 
197,794

Home equity
 
—

 
—

 
—

 
—

 
817,976

 
11,081

 
829,057

Total residential mortgage
 
276,138

 
78

 
2,404

 
493

 
1,767,930

 
37,129

 
2,084,172

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Personal
 
1,116,196

 
45

 
—

 
56

 
84,853

 
232

 
1,201,382

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total
 
$
19,312,702

 
$
210,149

 
$
160,326

 
$
143,554

 
$
1,886,858

 
$
37,398

 
$
21,750,987


The following table summarizes the Company’s loan portfolio at December 31, 2018 by the risk grade categories (in thousands): 
 
 
Internally Risk Graded
 
Non-Graded
 
 
 
 
Performing
 
 
 
 
 
 
 
 
 
 
Pass
 
Other Loans Especially Mentioned
 
Accruing Substandard
 
Nonaccrual
 
Performing
 
Nonaccrual
 
Total
Commercial:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Energy
 
$
3,414,039

 
$
42,176

 
$
86,624

 
47,494

 
$
—

 
$
—

 
$
3,590,333

Services
 
3,167,203

 
49,761

 
32,661

 
8,567

 
—

 
—

 
3,258,192

Wholesale/retail
 
1,593,902

 
18,809

 
7,131

 
1,316

 
—

 
—

 
1,621,158

Manufacturing
 
668,438

 
30,934

 
22,230

 
8,919

 
—

 
—

 
730,521

Healthcare
 
2,730,121

 
14,920

 
37,698

 
16,538

 
—

 
—

 
2,799,277

Public finance
 
804,550

 
—

 
—

 
—

 
—

 
—

 
804,550

Other commercial and industrial
 
756,815

 
1,266

 
7,588

 
16,954

 
49,371

 
53

 
832,047

Total commercial
 
13,135,068

 
157,866

 
193,932

 
99,788

 
49,371

 
53

 
13,636,078

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial real estate:
 
 

 
 

 
 

 
 
 
 

 
 

 
 

Residential construction and land development
 
148,234

 
—

 
—

 
350

 
—

 
—

 
148,584

Retail
 
885,588

 
11,926

 
1,289

 
20,279

 
—

 
—

 
919,082

Office
 
1,059,334

 
10,532

 
3,054

 
—

 
—

 
—

 
1,072,920

Multifamily
 
1,287,471

 
281

 
12

 
301

 
—

 
—

 
1,288,065

Industrial
 
776,898

 
—

 
1,208

 
—

 
—

 
—

 
778,106

Other commercial real estate
 
555,301

 
1,188

 
876

 
691

 
—

 
—

 
558,056

Total commercial real estate
 
4,712,826

 
23,927

 
6,439

 
21,621

 
—

 
—

 
4,764,813

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Residential mortgage:
 
 

 
 

 
 

 
 
 
 

 
 

 
 

Permanent mortgage
 
269,678

 
52

 
9,730

 
1,991

 
819,199

 
21,960

 
1,122,610

Permanent mortgages guaranteed by U.S. government agencies
 
—

 
—

 
—

 
—

 
183,734

 
7,132

 
190,866

Home equity
 
223,298

 
—

 
296

 
—

 
682,491

 
10,472

 
916,557

Total residential mortgage
 
492,976

 
52

 
10,026

 
1,991

 
1,685,424

 
39,564

 
2,230,033

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Personal
 
944,256

 
115

 
4,443

 
76

 
76,762

 
154

 
1,025,806

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total
 
$
19,285,126

 
$
181,960

 
$
214,840

 
123,476

 
$
1,811,557

 
$
39,771

 
$
21,656,730
Summary of Impaired Loans [Table Text Block]
 
As of December 31, 2019
 
Year Ended
 
 
 
Recorded Investment
 
 
 
December 31, 2019
 
Unpaid
Principal
Balance
 
Total
 
With No
Allowance
 
With Allowance
 
Related Allowance
 
Average Recorded
Investment
 
Interest Income Recognized
Commercial:
 
 
 
 
 
 
 
 
 
 
 
 
 
Energy
$
149,441

 
$
91,722

 
$
44,244

 
$
47,478

 
$
16,854

 
$
69,119

 
$
—

Services
10,923

 
7,483

 
6,301

 
1,182

 
240

 
5,854

 
—

Wholesale/retail
1,980

 
1,163

 
902

 
261

 
101

 
916

 
—

Manufacturing
10,848

 
10,133

 
9,914

 
219

 
219

 
9,144

 
—

Healthcare
13,774

 
4,480

 
4,480

 
—

 
—

 
7,798

 
—

Public finance
—

 
—

 
—

 
—

 
—

 
—

 
—

Other commercial and industrial
8,227

 
435

 
435

 
—

 
—

 
8,568

 
—

Total commercial
195,193

 
115,416

 
66,276

 
49,140

 
17,414

 
101,399

 
—

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial real estate:
 

 
 

 
 

 
 

 
 

 
 

 
 

Residential construction and land development
1,306

 
350

 
350

 
—

 
—

 
350

 
—

Retail
20,265

 
18,868

 
18,868

 
—

 
—

 
19,573

 
—

Office
—

 
—

 
—

 
—

 
—

 
—

 
—

Multifamily
6,858

 
6,858

 
6,858

 
—

 
—

 
3,580

 
—

Industrial
909

 
909

 
909

 
—

 
—

 
454

 
—

Other commercial real estate
801

 
641

 
641

 
—

 
—

 
666

 
—

Total commercial real estate
30,139

 
27,626

 
27,626

 
—

 
—

 
24,623

 
—

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Residential mortgage:
 

 
 

 
 

 
 

 
 

 
 

 
 

Permanent mortgage
24,868

 
20,441

 
20,441

 
—

 
—

 
22,196

 
1,198

Permanent mortgage guaranteed by U.S. government agencies1
204,187

 
197,794

 
197,794

 
—

 
—

 
195,009

 
7,733

Home equity
12,967

 
11,081

 
11,081

 
—

 
—

 
10,776

 
—

Total residential mortgage
242,022

 
229,316

 
229,316

 
—

 
—

 
227,981

 
8,931

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Personal
360

 
287

 
287

 
—

 
—

 
259

 
—

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total
$
467,714

 
$
372,645

 
$
323,505

 
$
49,140

 
$
17,414

 
$
354,262

 
$
8,931

1 
All permanent mortgage loans guaranteed by U.S. government agencies are considered impaired as we do not expect full collection of contractual principal and interest. At December 31, 2019, $6.1 million of these loans are nonaccruing and $192 million are accruing based on the guarantee by U.S. government agencies.

Generally, no interest income is recognized on impaired loans until all principal balances, including amounts charged-off, have been recovered.

 
As of December 31, 2018
 
Year Ended
 
 
 
 
Recorded Investment
 
 
 
December 31, 2018
 
 
Unpaid
Principal
Balance
 
Total
 
With No
Allowance
 
With Allowance
 
Related Allowance
 
Average Recorded
Investment
 
Interest Income Recognized
Commercial:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Energy
 
$
79,675

 
$
47,494

 
$
18,639

 
$
28,855

 
$
5,362

 
$
69,645

 
$
—

Services
 
13,437

 
8,567

 
8,489

 
78

 
74

 
4,509

 
—

Wholesale/retail
 
1,722

 
1,316

 
1,015

 
301

 
101

 
1,784

 
—

Manufacturing
 
10,055

 
8,919

 
8,673

 
246

 
246

 
7,249

 
—

Healthcare
 
24,319

 
16,538

 
10,563

 
5,975

 
2,949

 
14,297

 
—

Public finance
 
—

 
—

 
—

 
—

 
—

 
—

 
—

Other commercial and industrial
 
26,955

 
17,007

 
17,007

 
—

 
—

 
17,976

 
—

Total commercial
 
156,163

 
99,841

 
64,386

 
35,455

 
8,732

 
115,460

 
—

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial real estate:
 
 

 
 

 
 

 
 

 
 

 
 
 
 
Residential construction and land development
 
1,306

 
350

 
350

 
—

 
—

 
1,091

 
—

Retail
 
27,680

 
20,279

 
20,279

 
—

 
—

 
10,278

 
—

Office
 
—

 
—

 
—

 
—

 
—

 
137

 
—

Multifamily
 
301

 
301

 
301

 
—

 
—

 
151

 
—

Industrial
 
—

 
—

 
—

 
—

 
—

 
—

 
—

Other commercial real estate
 
851

 
691

 
691

 
—

 
—

 
581

 
—

Total commercial real estate
 
30,138

 
21,621

 
21,621

 
—

 
—

 
12,238

 
—

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Residential mortgage:
 
 

 
 

 
 

 
 

 
 

 
 
 
 
Permanent mortgage
 
28,716

 
23,951

 
23,951

 
—

 
—

 
24,572

 
1,233

Permanent mortgage guaranteed by U.S. government agencies1
 
196,296

 
190,866

 
190,866

 
—

 
—

 
180,813

 
7,172

Home equity
 
12,196

 
10,472

 
10,472

 
—

 
—

 
11,774

 
—

Total residential mortgage
 
237,208

 
225,289

 
225,289

 
—

 
—

 
217,159

 
8,405

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Personal
 
278

 
230

 
230

 
—

 
—

 
250

 
—

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total
 
$
423,787

 
$
346,981

 
$
311,526

 
$
35,455

 
$
8,732

 
$
345,107

 
$
8,405

1 
All permanent mortgage loans guaranteed by U.S. government agencies are considered impaired as we do not expect full collection of contractual principal and interest. At December 31, 2018, $7.1 million of these loans are nonaccruing and $184 million are accruing based on the guarantee by U.S. government agencies.
Summary of Loans by Aging Status [Table Text Block]
A summary of loans currently performing, loans past due and accruing and nonaccrual loans as of December 31, 2019 is as follows (in thousands):
 
 
 
 
Past Due
 
 
 
 
 
 
Current
 
30 to 59
Days
 
60 to 89
Days
 
90 Days
or More
 
Nonaccrual
 
Total
Commercial:
 
 
 
 
 
 
 
 
 
 
 
 
Energy
 
$
3,881,244

 
$
401

 
10

 
$
—

 
$
91,722

 
$
3,973,377

Services
 
3,105,621

 
1,737

 
523

 
6,799

 
7,483

 
3,122,163

Wholesale/retail
 
1,758,878

 
712

 
113

 
—

 
1,163

 
1,760,866

Manufacturing
 
654,329

 
410

 
190

 
387

 
10,133

 
665,449

Healthcare
 
3,027,329

 
2,039

 
—

 
68

 
4,480

 
3,033,916

Public finance
 
707,638

 
2,230

 
—

 
—

 
—

 
709,868

Other commercial and industrial
 
764,390

 
414

 
772

 
—

 
435

 
766,011

Total commercial
 
13,899,429

 
7,943

 
1,608

 
7,254

 
115,416

 
14,031,650

 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial real estate:
 
 

 
 

 
 
 
 

 
 

 
 

Residential construction and land development
 
147,379

 
3,093

 
—

 
57

 
350

 
150,879

Retail
 
756,653

 
—

 
—

 
—

 
18,868

 
775,521

Office
 
928,379

 
—

 
—

 
—

 
—

 
928,379

Multifamily
 
1,258,704

 
—

 
—

 
—

 
6,858

 
1,265,562

Industrial
 
855,208

 
—

 
—

 
—

 
909

 
856,117

Other commercial real estate
 
454,253

 
1,827

 
250

 
354

 
641

 
457,325

Total commercial real estate
 
4,400,576

 
4,920

 
250

 
411

 
27,626

 
4,433,783

 
 
 
 
 
 
 
 
 
 
 
 
 
Residential mortgage:
 
 

 
 

 
 
 
 

 
 

 
 

Permanent mortgage
 
1,034,716

 
2,011

 
153

 
—

 
20,441

 
1,057,321

Permanent mortgages guaranteed by U.S. government agencies
 
46,898

 
24,203

 
18,187

 
102,406

 
6,100

 
197,794

Home equity
 
814,325

 
3,343

 
308

 
—

 
11,081

 
829,057

Total residential mortgage
 
1,895,939

 
29,557

 
18,648

 
102,406

 
37,622

 
2,084,172

 
 
 
 
 
 
 
 
 
 
 
 
 
Personal
 
1,196,362

 
4,664

 
54

 
15

 
287

 
1,201,382

 
 
 
 
 
 
 
 
 
 
 
 
 
Total
 
$
21,392,306

 
$
47,084

 
20,560

 
$
110,086

 
$
180,951

 
$
21,750,987

A summary of loans currently performing, loans past due and accruing and nonaccrual loans as of December 31, 2018 is as follows (in thousands):
 
 
 
 
Past Due
 
 
 
 
 
 
Current
 
30 to 59
Days
 
60 to 89
Days
 
90 Days
or More
 
Nonaccrual
 
Total
Commercial:
 
 
 
 
 
 
 
 
 
 
 
 
Energy
 
$
3,542,839

 
$
—

 
—

 
$
—

 
$
47,494

 
$
3,590,333

Services
 
3,237,578

 
6,009

 
6,038

 
—

 
8,567

 
3,258,192

Wholesale/retail
 
1,619,290

 
515

 
37

 
—

 
1,316

 
1,621,158

Manufacturing
 
721,204

 
392

 
6

 
—

 
8,919

 
730,521

Healthcare
 
2,781,944

 
241

 
—

 
554

 
16,538

 
2,799,277

Public finance
 
804,550

 
—

 
—

 
—

 
—

 
804,550

Other commercial and industrial
 
814,489

 
518

 
25

 
8

 
17,007

 
832,047

Total commercial
 
13,521,894

 
7,675

 
6,106

 
562

 
99,841

 
13,636,078

 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial real estate:
 
 

 
 

 
 
 
 

 
 

 
 

Residential construction and land development
 
147,705

 
249

 
280

 
—

 
350

 
148,584

Retail
 
884,424

 
14,379

 
—

 
—

 
20,279

 
919,082

Office
 
1,072,920

 
—

 
—

 
—

 
—

 
1,072,920

Multifamily
 
1,287,483

 
281

 
—

 
—

 
301

 
1,288,065

Industrial
 
776,898

 
1,208

 
—

 
—

 
—

 
778,106

Other commercial real estate
 
556,239

 
412

 
—

 
714

 
691

 
558,056

Total commercial real estate
 
4,725,669

 
16,529

 
280

 
714

 
21,621

 
4,764,813

 
 
 
 
 
 
 
 
 
 
 
 
 
Residential mortgage:
 
 

 
 

 
 
 
 

 
 

 
 

Permanent mortgage
 
1,095,097

 
3,196

 
366

 
—

 
23,951

 
1,122,610

Permanent mortgages guaranteed by U.S. government agencies
 
37,459

 
24,369

 
16,345

 
105,561

 
7,132

 
190,866

Home equity
 
904,572

 
1,102

 
352

 
59

 
10,472

 
916,557

Total residential mortgage
 
2,037,128

 
28,667

 
17,063

 
105,620

 
41,555

 
2,230,033

 
 
 
 
 
 
 
 
 
 
 
 
 
Personal
 
1,024,298

 
479

 
796

 
3

 
230

 
1,025,806

 
 
 
 
 
 
 
 
 
 
 
 
 
Total
 
$
21,308,989

 
$
53,350

 
24,245

 
$
106,899

 
$
163,247

 
$
21,656,730