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Loans and Allowances for Credit Losses (Tables)
 12 Months Ended
Dec. 31, 2018
Loans Receivable, Net [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, 2018
 
December 31, 2017
 
 
Fixed
Rate
 
Variable
Rate
 
Non-accrual
 
Total
 
Fixed
Rate
 
Variable
Rate
 
Non-accrual
 
Total
Commercial
 
$
2,251,188

 
$
11,285,049

 
$
99,841

 
$
13,636,078

 
$
2,217,432

 
$
8,379,240

 
$
137,303

 
$
10,733,975

Commercial real estate
 
1,477,274

 
3,265,918

 
21,621

 
4,764,813

 
548,692

 
2,928,440

 
2,855

 
3,479,987

Residential mortgage
 
1,830,224

 
358,254

 
41,555

 
2,230,033

 
1,608,655

 
317,584

 
47,447

 
1,973,686

Personal
 
190,687

 
834,889

 
230

 
1,025,806

 
154,517

 
810,990

 
269

 
965,776

Total
 
$
5,749,373

 
$
15,744,110

 
$
163,247

 
$
21,656,730

 
$
4,529,296

 
$
12,436,254

 
$
187,874

 
$
17,153,424

Accruing loans past due (90 days)1
 
 

 
 

 
 

 
$
1,338

 
 

 
 

 
 

 
$
633

Foregone interest on nonaccrual loans
 
 
 
 
 
 
 
$
15,502

 
 
 
 
 
 
 
$
16,496

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, 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 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, 2016 is summarized as follows (in thousands):

 
 
Commercial
 
Commercial Real Estate
 
Residential Mortgage
 
Personal
 
Nonspecific Allowance
 
Total
Allowance for loan losses:
 
 
 
 
 
 
 
 
 
 
 
 
Beginning balance
 
$
130,334

 
$
41,391

 
$
19,509

 
$
4,164

 
$
30,126

 
$
225,524

Provision for loan losses
 
43,980

 
8,075

 
(1,972
)
 
7,310

 
(1,926
)
 
55,467

Loans charged off
 
(35,828
)
 
—

 
(1,312
)
 
(5,448
)
 
—

 
(42,588
)
Recoveries
 
1,727

 
1,283

 
1,999

 
2,747

 
—

 
7,756

Ending balance
 
$
140,213

 
$
50,749

 
$
18,224

 
$
8,773

 
$
28,200

 
$
246,159

 
 
 
 
 
 
 
 
 
 
 
 
 
Accrual for off-balance sheet credit risk:
 
 

 
 

 
 

 
 

 
 

 
 

Beginning balance
 
$
1,506

 
$
153

 
$
30

 
$
22

 
$
—

 
$
1,711

Provision for off-balance sheet credit risk
 
9,557

 
(30
)
 
20

 
(14
)
 
—

 
9,533

Ending balance
 
$
11,063

 
$
123

 
$
50

 
$
8

 
$
—

 
$
11,244

 
 
 
 
 
 
 
 
 
 
 
 
 
Total provision for credit losses
 
$
53,537

 
$
8,045

 
$
(1,952
)
 
$
7,296

 
$
(1,926
)
 
$
65,000






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



The allowance for loan losses and recorded investment of the related loans by portfolio segment for each impairment measurement method at December 31, 2017 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
 
$
10,596,672

 
$
115,438

 
$
137,303

 
$
8,831

 
$
10,733,975

 
$
124,269

Commercial real estate
 
3,477,132

 
56,621

 
2,855

 
—

 
3,479,987

 
56,621

Residential mortgage
 
1,926,239

 
18,451

 
47,447

 
—

 
1,973,686

 
18,451

Personal
 
965,507

 
9,124

 
269

 
—

 
965,776

 
9,124

Total
 
16,965,550

 
199,634

 
187,874

 
8,831

 
17,153,424

 
208,465

 
 
 
 
 
 
 
 
 
 
 
 
 
Nonspecific allowance
 
—

 
—

 
—

 
—

 
—

 
22,217

 
 
 
 
 
 
 
 
 
 
 
 
 
Total
 
$
16,965,550

 
$
199,634

 
$
187,874

 
$
8,831

 
$
17,153,424

 
$
230,682
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, 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

 
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, 2017 is as follows (in thousands):

 
 
Internally Risk Graded
 
Non-Graded
 
Total
 
 
Recorded Investment
 
Related Allowance
 
Recorded Investment
 
Related Allowance
 
Recorded Investment
 
Related
Allowance
Commercial
 
$
10,706,035

 
$
123,383

 
$
27,940

 
$
886

 
$
10,733,975

 
$
124,269

Commercial real estate
 
3,479,987

 
56,621

 
—

 
—

 
3,479,987

 
56,621

Residential mortgage
 
234,477

 
2,947

 
1,739,209

 
15,504

 
1,973,686

 
18,451

Personal
 
877,390

 
6,461

 
88,386

 
2,663

 
965,776

 
9,124

Total
 
15,297,889

 
189,412

 
1,855,535

 
19,053

 
17,153,424

 
208,465

 
 
 
 
 
 
 
 
 
 
 
 
 
Nonspecific allowance
 
—

 
—

 
—

 
—

 
—

 
22,217

 
 
 
 
 
 
 
 
 
 
 
 
 
Total
 
$
15,297,889

 
$
189,412

 
$
1,855,535

 
$
19,053

 
$
17,153,424

 
$
230,682



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, 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
 
3,161,157

 
49,761

 
32,661

 
8,567

 
—

 
—

 
3,252,146

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
 
2,664,381

 
14,920

 
37,698

 
16,538

 
—

 
—

 
2,733,537

Public finance
 
876,336

 
—

 
—

 
—

 
—

 
—

 
876,336

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
 
467,233

 
52

 
9,730

 
1,991

 
819,199

 
21,960

 
1,320,165

Permanent mortgages guaranteed by U.S. government agencies
 
—

 
—

 
—

 
—

 
183,734

 
7,132

 
190,866

Home equity
 
25,743

 
—

 
296

 
—

 
682,491

 
10,472

 
719,002

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


The following table summarizes the Company’s loan portfolio at December 31, 2017 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
 
$
2,632,986

 
$
60,288

 
$
144,598

 
92,284

 
$
—

 
$
—

 
$
2,930,156

Services
 
2,478,945

 
13,927

 
26,533

 
2,620

 
—

 
—

 
2,522,025

Wholesale/retail
 
1,443,917

 
19,263

 
5,502

 
2,574

 
—

 
—

 
1,471,256

Manufacturing
 
472,869

 
6,653

 
11,290

 
5,962

 
—

 
—

 
496,774

Healthcare
 
2,182,231

 
3,186

 
43,305

 
14,765

 
—

 
—

 
2,243,487

Public finance
 
541,775

 
—

 
—

 
—

 
—

 
—

 
541,775

Other commercial and industrial
 
473,366

 
7

 
8,161

 
19,028

 
27,870

 
70

 
528,502

Total commercial
 
10,226,089

 
103,324

 
239,389

 
137,233

 
27,870

 
70

 
10,733,975

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial real estate:
 
 

 
 

 
 

 
 
 
 

 
 

 
 

Residential construction and land development
 
113,190

 
1,828

 
395

 
1,832

 
—

 
—

 
117,245

Retail
 
686,915

 
4,243

 
98

 
276

 
—

 
—

 
691,532

Office
 
824,408

 
7,087

 
—

 
275

 
—

 
—

 
831,770

Multifamily
 
979,969

 
—

 
48

 
—

 
—

 
—

 
980,017

Industrial
 
573,014

 
—

 
—

 
—

 
—

 
—

 
573,014

Other commercial real estate
 
285,506

 
145

 
286

 
472

 
—

 
—

 
286,409

Total commercial real estate
 
3,463,002

 
13,303

 
827

 
2,855

 
—

 
—

 
3,479,987

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Residential mortgage:
 
 

 
 

 
 

 
 
 
 

 
 

 
 

Permanent mortgage
 
232,492

 
—

 
822

 
1,163

 
784,928

 
24,030

 
1,043,435

Permanent mortgages guaranteed by U.S. government agencies
 
—

 
—

 
—

 
—

 
188,327

 
9,179

 
197,506

Home equity
 
—

 
—

 
—

 
—

 
719,670

 
13,075

 
732,745

Total residential mortgage
 
232,492

 
—

 
822

 
1,163

 
1,692,925

 
46,284

 
1,973,686

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Personal
 
875,696

 
1,548

 
63

 
83

 
88,200

 
186

 
965,776

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total
 
$
14,797,279

 
$
118,175

 
$
241,101

 
141,334

 
$
1,808,995

 
$
46,540

 
$
17,153,424
Summary of Impaired Loans [Table Text Block]
 
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.

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

 
As of December 31, 2017
 
Year Ended
 
 
 
 
Recorded Investment
 
 
 
December 31, 2017
 
 
Unpaid
Principal
Balance
 
Total
 
With No
Allowance
 
With Allowance
 
Related Allowance
 
Average Recorded
Investment
 
Interest Income Recognized
Commercial:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Energy
 
$
111,011

 
$
92,284

 
$
40,968

 
$
51,316

 
$
8,814

 
$
112,392

 
$
—

Services
 
5,324

 
2,620

 
2,620

 
—

 
—

 
5,396

 
—

Wholesale/retail
 
9,099

 
2,574

 
2,574

 
—

 
—

 
6,990

 
—

Manufacturing
 
6,073

 
5,962

 
5,962

 
—

 
—

 
5,446

 
—

Healthcare
 
25,140

 
14,765

 
14,765

 
—

 
—

 
7,795

 
—

Public finance
 
—

 
—

 
—

 
—

 
—

 
—

 
—

Other commercial and industrial
 
27,957

 
19,098

 
19,080

 
18

 
17

 
20,108

 
—

Total commercial
 
184,604

 
137,303

 
85,969

 
51,334

 
8,831

 
158,127

 
—

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial real estate:
 
 

 
 

 
 

 
 

 
 

 
 
 
 
Residential construction and land development
 
3,285

 
1,832

 
1,832

 
—

 
—

 
2,633

 
—

Retail
 
509

 
276

 
276

 
—

 
—

 
301

 
—

Office
 
287

 
275

 
275

 
—

 
—

 
351

 
—

Multifamily
 
—

 
—

 
—

 
—

 
—

 
19

 
—

Industrial
 
—

 
—

 
—

 
—

 
—

 
38

 
—

Other commercial real estate
 
670

 
472

 
472

 
—

 
—

 
847

 
—

Total commercial real estate
 
4,751

 
2,855

 
2,855

 
—

 
—

 
4,189

 
—

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Residential mortgage:
 
 

 
 

 
 

 
 

 
 

 
 
 
 
Permanent mortgage
 
30,435

 
25,193

 
25,193

 
—

 
—

 
24,024

 
1,229

Permanent mortgage guaranteed by U.S. government agencies1
 
203,814

 
197,506

 
197,506

 
—

 
—

 
199,244

 
7,632

Home equity
 
14,548

 
13,075

 
13,075

 
—

 
—

 
12,297

 
—

Total residential mortgage
 
248,797

 
235,774

 
235,774

 
—

 
—

 
235,565

 
8,861

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Personal
 
307

 
269

 
269

 
—

 
—

 
280

 
—

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total
 
$
438,459

 
$
376,201

 
$
324,867

 
$
51,334

 
$
8,831

 
$
398,161

 
$
8,861

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, 2017, $9.2 million of these loans are nonaccruing and $188 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, 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
 
3,231,532

 
6,009

 
6,038

 
—

 
8,567

 
3,252,146

Wholesale/retail
 
1,619,290

 
515

 
37

 
—

 
1,316

 
1,621,158

Manufacturing
 
721,204

 
392

 
6

 
—

 
8,919

 
730,521

Healthcare
 
2,716,204

 
241

 
—

 
554

 
16,538

 
2,733,537

Public finance
 
876,336

 
—

 
—

 
—

 
—

 
876,336

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
 
1,292,652

 
3,196

 
366

 
—

 
23,951

 
1,320,165

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

 
24,369

 
16,345

 
105,561

 
7,132

 
190,866

Home equity
 
707,017

 
1,102

 
352

 
59

 
10,472

 
719,002

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

A summary of loans currently performing, loans past due and accruing and nonaccrual loans as of December 31, 2017 is as follows (in thousands):
 
 
 
 
Past Due
 
 
 
 
 
 
Current
 
30 to 59
Days
 
60 to 89
Days
 
90 Days
or More
 
Nonaccrual
 
Total
Commercial:
 
 
 
 
 
 
 
 
 
 
 
 
Energy
 
$
2,833,668

 
$
—

 
4,204

 
$
—

 
$
92,284

 
$
2,930,156

Services
 
2,518,298

 
514

 
486

 
107

 
2,620

 
2,522,025

Wholesale/retail
 
1,468,284

 
398

 
—

 
—

 
2,574

 
1,471,256

Manufacturing
 
490,739

 
—

 
73

 
—

 
5,962

 
496,774

Healthcare
 
2,213,504

 
15,218

 
—

 
—

 
14,765

 
2,243,487

Public finance
 
541,775

 
—

 
—

 
—

 
—

 
541,775

Other commercial and industrial
 
509,116

 
85

 
78

 
125

 
19,098

 
528,502

Total commercial
 
10,575,384

 
16,215

 
4,841

 
232

 
137,303

 
10,733,975

 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial real estate:
 
 

 
 

 
 
 
 

 
 

 
 

Residential construction and land development
 
115,213

 
200

 
—

 
—

 
1,832

 
117,245

Retail
 
691,256

 
—

 
—

 
—

 
276

 
691,532

Office
 
831,118

 
254

 
—

 
123

 
275

 
831,770

Multifamily
 
979,625

 
22

 
370

 
—

 
—

 
980,017

Industrial
 
573,014

 
—

 
—

 
—

 
—

 
573,014

Other commercial real estate
 
285,937

 
—

 
—

 
—

 
472

 
286,409

Total commercial real estate
 
3,476,163

 
476

 
370

 
123

 
2,855

 
3,479,987

 
 
 
 
 
 
 
 
 
 
 
 
 
Residential mortgage:
 
 

 
 

 
 
 
 

 
 

 
 

Permanent mortgage
 
1,014,588

 
3,435

 
219

 
—

 
25,193

 
1,043,435

Permanent mortgages guaranteed by U.S. government agencies
 
22,692

 
18,978

 
13,468

 
133,189

 
9,179

 
197,506

Home equity
 
717,007

 
2,206

 
440

 
17

 
13,075

 
732,745

Total residential mortgage
 
1,754,287

 
24,619

 
14,127

 
133,206

 
47,447

 
1,973,686

 
 
 
 
 
 
 
 
 
 
 
 
 
Personal
 
964,374

 
681

 
191

 
261

 
269

 
965,776

 
 
 
 
 
 
 
 
 
 
 
 
 
Total
 
$
16,770,208

 
$
41,991

 
19,529

 
$
133,822

 
$
187,874

 
$
17,153,424