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Loan Portfolio and Credit Quality (Tables)
 6 Months Ended
Jun. 30, 2018
Loans and Leases Receivable Disclosure [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
The following table presents a summary of the loan portfolio based on the portfolio segment as of the dates indicated:
 
June 30, 2018
 
December 31, 2017
 
(In thousands)
Commercial and industrial
$
583,193

 
$
520,992

Commercial tax-exempt
438,882

 
418,698

Total commercial and industrial
1,022,075

 
939,690

Commercial real estate
2,504,521

 
2,440,220

Construction and land
172,024

 
164,990

Residential
2,808,206

 
2,682,533

Home equity
91,801

 
99,958

Consumer and other
168,496

 
177,637

Total
$
6,767,123

 
$
6,505,028
Schedule of Financing Receivables, Non Accrual Status [Table Text Block]
The following table presents nonaccrual loans receivable by class of receivable as of the dates indicated:
 
June 30, 2018
 
December 31, 2017
 
(In thousands)
Commercial and industrial
$
1,412

 
$
748

Commercial tax-exempt
—

 
—

Total commercial and industrial
1,412

 
748

Commercial real estate
1,838

 
1,985

Construction and land
—

 
110

Residential
9,610

 
8,470

Home equity
2,789

 
2,840

Consumer and other
2

 
142

Total
$
15,651

 
$
14,295
Past Due Financing Receivables [Table Text Block]
The following tables show the payment status of loans receivable by class of receivable as of the dates indicated:
 
June 30, 2018
 
Accruing Past Due
 
Nonaccrual Loans
 
 
 
 
 
30-59 Days Past Due
 
60-89 Days Past Due
 
Total Accruing Past Due
 
Current
 
30-89 Days Past Due
 
90 Days or
Greater
Past Due
 
Total Non-Accrual Loans
 
Current Accruing Loans
 
Total
Loans
Receivable
 
(In thousands)
Commercial and industrial
$
521

 
$
—

 
$
521

 
$
367

 
$
203

 
$
842

 
$
1,412

 
$
581,260

 
$
583,193

Commercial tax-exempt
—

 
—

 
—

 
—

 
—

 
—

 
—

 
438,882

 
438,882

Commercial real estate
—

 
—

 
—

 
—

 
—

 
1,838

 
1,838

 
2,502,683

 
2,504,521

Construction and land
—

 
—

 
—

 
—

 
—

 
—

 
—

 
172,024

 
172,024

Residential
—

 
3,641

 
3,641

 
2,603

 
800

 
6,207

 
9,610

 
2,794,955

 
2,808,206

Home equity
473

 
339

 
812

 
—

 
65

 
2,724

 
2,789

 
88,200

 
91,801

Consumer and other
—

 
3

 
3

 
—

 
—

 
2

 
2

 
168,491

 
168,496

Total
$
994

 
$
3,983

 
$
4,977

 
$
2,970

 
$
1,068

 
$
11,613

 
$
15,651

 
$
6,746,495

 
$
6,767,123


 
December 31, 2017
 
Accruing Past Due
 
Nonaccrual Loans
 
 
 
 
 
30-59 Days Past Due
 
60-89 Days Past Due
 
Total Accruing Past Due
 
Current
 
30-89 Days Past Due
 
90 Days or Greater Past Due
 
Total Non-Accrual Loans
 
Current Accruing Loans
 
Total Loans Receivable
 
(In thousands)
Commercial and industrial
$
10,903

 
$
849

 
$
11,752

 
$
355

 
$
—

 
$
393

 
$
748

 
$
508,492

 
$
520,992

Commercial tax-exempt
—

 
—

 
—

 
—

 
—

 
—

 
—

 
418,698

 
418,698

Commercial real estate
4,043

 
—

 
4,043

 
163

 
—

 
1,822

 
1,985

 
2,434,192

 
2,440,220

Construction and land
—

 
—

 
—

 
—

 
—

 
110

 
110

 
164,880

 
164,990

Residential
7,239

 
1,635

 
8,874

 
805

 
3,172

 
4,493

 
8,470

 
2,665,189

 
2,682,533

Home equity
355

 
—

 
355

 
—

 
71

 
2,769

 
2,840

 
96,763

 
99,958

Consumer and other
24

 
—

 
24

 
17

 
125

 
—

 
142

 
177,471

 
177,637

Total
$
22,564

 
$
2,484

 
$
25,048

 
$
1,340

 
$
3,368

 
$
9,587

 
$
14,295

 
$
6,465,685

 
$
6,505,028
Financing Receivable Credit Quality Indicators [Table Text Block]
The following tables present the loan portfolio’s credit risk profile by internally assigned grade and class of receivable as of the dates indicated:
 
June 30, 2018
 
By Loan Grade or Nonaccrual Status
 
 
 
Pass
 
Special
Mention
 
Accruing
Classified (1)
 
Nonaccrual
Loans
 
Total
 
(In thousands)
Commercial and industrial
$
567,334

 
$
6,845

 
$
7,602

 
$
1,412

 
$
583,193

Commercial tax-exempt
438,882

 
—

 
—

 
—

 
438,882

Commercial real estate
2,426,821

 
46,603

 
29,259

 
1,838

 
2,504,521

Construction and land
164,760

 
—

 
7,264

 
—

 
172,024

Residential
2,797,270

 
—

 
1,326

 
9,610

 
2,808,206

Home equity
89,012

 
—

 
—

 
2,789

 
91,801

Consumer and other
168,492

 
—

 
2

 
2

 
168,496

Total
$
6,652,571

 
$
53,448

 
$
45,453

 
$
15,651

 
$
6,767,123

 
December 31, 2017
 
By Loan Grade or Nonaccrual Status
 
 
 
Pass
 
Special
Mention
 
Accruing
Classified (1)
 
Nonaccrual
Loans
 
Total
 
(In thousands)
Commercial and industrial
$
496,395

 
$
12,898

 
$
10,951

 
$
748

 
$
520,992

Commercial tax-exempt
413,139

 
5,559

 
—

 
—

 
418,698

Commercial real estate
2,346,833

 
56,947

 
34,455

 
1,985

 
2,440,220

Construction and land
146,514

 
11,770

 
6,596

 
110

 
164,990

Residential
2,672,714

 
—

 
1,349

 
8,470

 
2,682,533

Home equity
97,118

 
—

 
—

 
2,840

 
99,958

Consumer and other
177,494

 
—

 
1

 
142

 
177,637

Total
$
6,350,207

 
$
87,174

 
$
53,352

 
$
14,295

 
$
6,505,028

______________________
(1)
Accruing Classified includes both Substandard and Doubtful classifications.
Impaired Financing Receivables [Table Text Block]
The following tables present, by class of receivable, the balance of impaired loans with and without a related allowance, the associated allowance for those impaired loans with a related allowance, and the total unpaid principal on impaired loans:
 
As of and for the three and six months ended June 30, 2018
 
Recorded Investment (1)
 
Unpaid Principal Balance
 
Related Allowance
 
QTD Average Recorded Investment
 
YTD Average Recorded Investment
 
QTD Interest Income Recognized while Impaired
 
YTD Interest Income Recognized while Impaired
 
(In thousands)
With no related allowance recorded:
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial and industrial
$
2,015

 
$
2,954

 
n/a
 
$
2,048

 
$
1,835

 
$
14

 
$
22

Commercial tax-exempt
—

 
—

 
n/a
 
—

 
—

 
—

 
—

Commercial real estate
2,932

 
4,695

 
n/a
 
2,939

 
2,460

 
25

 
50

Construction and land
—

 
—

 
n/a
 
82

 
94

 
16

 
16

Residential
10,455

 
10,815

 
n/a
 
10,587

 
10,009

 
87

 
189

Home equity
—

 
—

 
n/a
 
1,311

 
1,509

 
15

 
24

Consumer and other
—

 
—

 
n/a
 
—

 
—

 
—

 
—

Subtotal
15,402

 
18,464

 
n/a
 
16,967

 
15,907

 
157

 
301

With an allowance recorded:
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial and industrial
303

 
403

 
$
134

 
76

 
147

 
—

 
2

Commercial tax-exempt
—

 
—

 
—

 
—

 
—

 
—

 
—

Commercial real estate
5,426

 
5,855

 
187

 
5,467

 
6,055

 
72

 
228

Construction and land
—

 
—

 
—

 
—

 
—

 
—

 
—

Residential
816

 
816

 
82

 
818

 
821

 
6

 
12

Home equity
1,769

 
1,769

 
597

 
469

 
284

 
—

 
—

Consumer and other
—

 
—

 
—

 
—

 
18

 
—

 
3

Subtotal
8,314

 
8,843

 
1,000

 
6,830

 
7,325

 
78

 
245

Total:
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial and industrial
2,318

 
3,357

 
134

 
2,124

 
1,982

 
14

 
24

Commercial tax-exempt
—

 
—

 
—

 
—

 
—

 
—

 
—

Commercial real estate
8,358

 
10,550

 
187

 
8,406

 
8,515

 
97

 
278

Construction and land
—

 
—

 
—

 
82

 
94

 
16

 
16

Residential
11,271

 
11,631

 
82

 
11,405

 
10,830

 
93

 
201

Home equity
1,769

 
1,769

 
597

 
1,780

 
1,793

 
15

 
24

Consumer and other
—

 
—

 
—

 
—

 
18

 
—

 
3

Total
$
23,716

 
$
27,307

 
$
1,000

 
$
23,797

 
$
23,232

 
$
235

 
$
546

_____________________
(1)
Recorded investment represents the client loan balance net of historical charge-offs and historical nonaccrual interest paid, if applicable, which was applied to principal.

 
As of and for the three and six months ended June 30, 2017
 
Recorded Investment (1)
 
Unpaid Principal Balance
 
Related Allowance
 
QTD Average Recorded Investment
 
YTD Average Recorded Investment
 
QTD Interest Income Recognized while Impaired
 
YTD Interest Income Recognized while Impaired
 
(In thousands)
With no related allowance recorded:
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial and industrial
$
1,771

 
$
2,377

 
n/a
 
$
1,667

 
$
1,703

 
$
12

 
$
25

Commercial tax-exempt
—

 
—

 
n/a
 
1,084

 
1,859

 
80

 
80

Commercial real estate
2,879

 
6,429

 
n/a
 
3,358

 
3,824

 
724

 
970

Construction and land
232

 
568

 
n/a
 
190

 
181

 
—

 
—

Residential
9,600

 
9,971

 
n/a
 
9,561

 
8,958

 
78

 
179

Home equity
—

 
—

 
n/a
 
—

 
—

 
—

 
—

Consumer and other
—

 
—

 
n/a
 
—

 
—

 
—

 
—

Subtotal
14,482

 
19,345

 
n/a
 
15,860

 
16,525

 
894

 
1,254

With an allowance recorded:
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial and industrial
—

 
—

 
$
—

 
—

 
—

 
—

 
—

Commercial tax-exempt
—

 
—

 
—

 
—

 
—

 
—

 
—

Commercial real estate
6,996

 
7,425

 
453

 
7,011

 
7,042

 
96

 
171

Construction and land
—

 
—

 
—

 
—

 
—

 
—

 
—

Residential
2,503

 
2,503

 
507

 
2,613

 
3,312

 
23

 
62

Home equity
36

 
36

 
21

 
37

 
37

 
—

 
—

Consumer and other
—

 
—

 
—

 
—

 
—

 
—

 
—

Subtotal
9,535

 
9,964

 
981

 
9,661

 
10,391

 
119

 
233

Total:
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial and industrial
1,771

 
2,377

 
—

 
1,667

 
1,703

 
12

 
25

Commercial tax-exempt
—

 
—

 
—

 
1,084

 
1,859

 
80

 
80

Commercial real estate
9,875

 
13,854

 
453

 
10,369

 
10,866

 
820

 
1,141

Construction and land
232

 
568

 
—

 
190

 
181

 
—

 
—

Residential
12,103

 
12,474

 
507

 
12,174

 
12,270

 
101

 
241

Home equity
36

 
36

 
21

 
37

 
37

 
—

 
—

Consumer and other
—

 
—

 
—

 
—

 
—

 
—

 
—

Total
$
24,017

 
$
29,309

 
$
981

 
$
25,521

 
$
26,916

 
$
1,013

 
$
1,487

_____________________
(1)
Recorded investment represents the client loan balance net of historical charge-offs and historical nonaccrual interest paid, if applicable, which was applied to principal.


 
As of and for the year ended December 31, 2017
 
Recorded Investment (1)
 
Unpaid Principal Balance
 
Related Allowance
 
 Average Recorded Investment
 
Interest Income Recognized while Impaired
 
(In thousands)
With no related allowance recorded:
 
 
 
 
 
 
 
 
 
Commercial and industrial
$
1,434

 
$
2,238

 
n/a
 
$
1,594

 
$
50

Commercial tax-exempt
—

 
—

 
n/a
 
1,001

 
80

Commercial real estate
1,832

 
3,453

 
n/a
 
3,098

 
1,546

Construction and land
109

 
109

 
n/a
 
172

 
—

Residential
9,337

 
9,709

 
n/a
 
9,033

 
360

Home equity
1,779

 
1,779

 
n/a
 
413

 
—

Consumer and other
—

 
—

 
n/a
 
—

 
—

Subtotal
14,491

 
17,288

 
n/a
 
15,311

 
2,036

With an allowance recorded:
 
 
 
 
 
 
 
 
 
Commercial and industrial
242

 
242

 
$
58

 
156

 
4

Commercial tax-exempt
—

 
—

 
—

 
—

 
—

Commercial real estate
6,855

 
7,284

 
362

 
6,980

 
322

Construction and land
—

 
—

 
—

 
—

 
—

Residential
828

 
828

 
89

 
2,469

 
89

Home equity
36

 
36

 
20

 
36

 
1

Consumer and other
125

 
250

 
125

 
10

 
—

Subtotal
8,086

 
8,640

 
654

 
9,651

 
416

Total:
 
 
 
 
 
 
 
 
 
Commercial and industrial
1,676

 
2,480

 
58

 
1,750

 
54

Commercial tax-exempt
—

 
—

 
—

 
1,001

 
80

Commercial real estate
8,687

 
10,737

 
362

 
10,078

 
1,868

Construction and land
109

 
109

 
—

 
172

 
—

Residential
10,165

 
10,537

 
89

 
11,502

 
449

Home equity
1,815

 
1,815

 
20

 
449

 
1

Consumer and other
125

 
250

 
125

 
10

 
—

Total
$
22,577

 
$
25,928

 
$
654

 
$
24,962

 
$
2,452

_____________________
(1)
Recorded investment represents the client loan balance net of historical charge-offs and historical nonaccrual interest paid, if applicable, which was applied to principal.
Troubled Debt Restructurings on Financing Receivables [Table Text Block]
Since all TDR loans are considered impaired loans, they are individually evaluated for impairment. The resulting impairment, if any, would have an impact on the allowance for loan losses as a specific reserve or charge-off. If, prior to the classification as a TDR, the loan was not impaired, there would have been a general or allocated reserve on the particular loan. Therefore, depending upon the result of the impairment analysis, there could be an increase or decrease in the related allowance for loan losses. Many loans initially categorized as TDRs are already on nonaccrual status and are already considered impaired. Therefore, there is generally not a material change to the allowance for loan losses when a nonaccruing loan is categorized as a TDR.
 
As of and for the three and six months ended June 30, 2018
 
Restructured Current Quarter
 
TDRs that defaulted in the Current
Quarter that were restructured
in prior twelve months
 
# of
Loans
 
Pre-
modification
recorded
investment
 
Post-
modification
recorded
investment
 
# of
Loans
 
Post-
modification
recorded
investment
 
(Dollars in thousands)
Commercial and industrial (1)
1

 
$
100

 
$
100

 
—

 
$
—

Commercial real estate
—

 
—

 
—

 
—

 
—

Construction and land
—

 
—

 
—

 
—

 
—

Residential
—

 
—

 
—

 
—

 
—

Home equity
—

 
—

 
—

 
—

 
—

Consumer and other
—

 
—

 
—

 
—

 
—

Total
1

 
$
100

 
$
100

 
—

 
$
—

______________________
(1)    Represents the following type of concession: extension of term.
Loan Participation Amounts by Loan Type [Table Text Block]
The following table presents a summary of the loan participations serviced for others and loans serviced for others based on class of receivable as of the dates indicated:
 
June 30, 2018
 
December 31, 2017
 
(In thousands)
Commercial and industrial
$
8,313

 
$
8,484

Commercial tax-exempt
19,464

 
19,805

Commercial real estate
49,200

 
49,783

Construction and land
32,229

 
37,840

Total loan participations serviced for others
$
109,206

 
$
115,912

 
 
 
 
Residential
$
38,217

 
$
41,440

Total loans serviced for others
$
38,217

 
$
41,440