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Allowance for Loan Losses (Tables)
 12 Months Ended
Dec. 31, 2017
Allowance for Loan Losses [Abstract]  
Allowance for Credit Losses on Financing Receivables [Table Text Block]
The following table presents a summary of the changes in the allowance for loan losses for the periods indicated:
 
As of and for the year ended December 31,
 
2017
 
2016
 
2015
 
(In thousands)
Allowance for loan losses, beginning of year:
 
 
 
 
 
Commercial and industrial
$
12,751

 
$
15,814

 
$
14,114

Commercial real estate
50,412

 
44,215

 
43,854

Construction and land
3,039

 
6,322

 
4,041

Residential
10,449

 
10,544

 
10,374

Home equity
1,035

 
1,085

 
1,003

Consumer and other
391

 
520

 
382

Unallocated (1)
—

 
—

 
2,070

Total allowance for loan losses, beginning of year
78,077

 
78,500

 
75,838

Loans charged-off:
 
 
 
 
 
Commercial and industrial
(393
)
 
(2,851
)
 
(253
)
Commercial real estate
—

 
—

 
(1,400
)
Construction and land
—

 
(400
)
 
—

Residential
(58
)
 
(605
)
 
(313
)
Home equity
—

 
—

 
—

Consumer and other
(412
)
 
(93
)
 
(70
)
Total charge-offs
(863
)
 
(3,949
)
 
(2,036
)
Recoveries on loans previously charged-off:
 
 
 
 
 
Commercial and industrial
472

 
3,212

 
2,471

Commercial real estate
4,621

 
6,040

 
2,482

Construction and land
25

 
1,117

 
1,158

Residential
47

 
65

 
141

Home equity
—

 
—

 
—

Consumer and other
32

 
27

 
1

Total recoveries
5,197

 
10,461

 
6,253

Provision/ (credit) for loan losses:
 
 
 
 
 
Commercial and industrial
(1,095
)
 
(3,424
)
 
(518
)
Commercial real estate
(8,213
)
 
157

 
(721
)
Construction and land
1,885

 
(4,000
)
 
1,123

Residential
(665
)
 
445

 
342

Home equity
(200
)
 
(50
)
 
82

Consumer and other
619

 
(63
)
 
207

Unallocated (1)
—

 
—

 
(2,070
)
Total provision/(credit) for loan losses
(7,669
)
 
(6,935
)
 
(1,555
)
 
 
 
 
 
 
 
 
 
 
 
 
 
As of and for the year ended December 31,
 
2017
 
2016
 
2015
 
(In thousands)
Allowance for loan losses at December 31 (end of year):
 
 
 
 
 
Commercial and industrial
11,735

 
12,751

 
15,814

Commercial real estate
46,820

 
50,412

 
44,215

Construction and land
4,949

 
3,039

 
6,322

Residential
9,773

 
10,449

 
10,544

Home equity
835

 
1,035

 
1,085

Consumer and other
630

 
391

 
520

Total allowance for loan losses at December 31 (end of year)
$
74,742

 
$
78,077

 
$
78,500

__________________
(1)
As of December 31, 2015, the unallocated reserve was allocated to the qualitative factors as part of the general reserve (ASC 450). The allocation had no effect on the 2015 provision/ (credit) for loan losses.
The provision/ (credit) for loan losses and related balance in the allowance for loan losses for tax-exempt commercial and industrial loans are included with commercial and industrial. The provision/ (credit) for loan losses and related balance in the allowance for loan losses for tax-exempt commercial real estate loans are included with commercial real estate. There were no charge-offs or recoveries, for any period presented, for both commercial and industrial and commercial real estate tax-exempt loans.
The following tables present the Company’s allowance for loan losses and loan portfolio at December 31, 2017 and 2016 by portfolio segment, disaggregated by method of analysis. The Company had no loans acquired with deteriorated credit quality at December 31, 2017 or 2016.
 
December 31, 2017
 
Individually Evaluated
for Impairment
 
Collectively Evaluated
for Impairment
 
Total
 
Recorded
investment
(loan balance)
 
Allowance
for loan
losses
 
Recorded
investment
(loan balance)
 
Allowance
for loan
losses
 
Recorded
investment
(loan balance)
 
Allowance
for loan
losses
 
(In thousands)
Commercial and industrial
$
1,676

 
$
58

 
$
938,014

 
$
11,677

 
$
939,690

 
$
11,735

Commercial real estate
8,687

 
362

 
2,431,533

 
46,458

 
2,440,220

 
46,820

Construction and land
109

 
—

 
164,881

 
4,949

 
164,990

 
4,949

Residential
10,165

 
89

 
2,672,368

 
9,684

 
2,682,533

 
9,773

Home equity
1,815

 
20

 
98,143

 
815

 
99,958

 
835

Consumer
125

 
125

 
177,512

 
505

 
177,637

 
630

Total
$
22,577

 
$
654

 
$
6,482,451

 
$
74,088

 
$
6,505,028

 
$
74,742

 
December 31, 2016
 
Individually Evaluated
for Impairment
 
Collectively Evaluated
for Impairment
 
Total
 
Recorded
investment
(loan balance)
 
Allowance
for loan
losses
 
Recorded
investment
(loan balance)
 
Allowance
for loan
losses
 
Recorded
investment
(loan balance)
 
Allowance
for loan
losses
 
(In thousands)
Commercial and industrial
$
1,793

 
$
—

 
$
1,008,181

 
$
12,751

 
$
1,009,974

 
$
12,751

Commercial real estate
11,603

 
548

 
2,290,641

 
49,864

 
2,302,244

 
50,412

Construction and land
179

 
—

 
104,660

 
3,039

 
104,839

 
3,039

Residential
12,418

 
565

 
2,367,443

 
9,884

 
2,379,861

 
10,449

Home equity
37

 
22

 
118,780

 
1,013

 
118,817

 
1,035

Consumer
—

 
—

 
198,619

 
391

 
198,619

 
391

Total
$
26,030

 
$
1,135

 
$
6,088,324

 
$
76,942

 
$
6,114,354

 
$
78,077