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INVESTMENTS (Tables)
 3 Months Ended
Mar. 31, 2020
Investments, Debt and Equity Securities [Abstract]  
Summary of Amortized Costs and Estimated Fair Values of Available-For-Sale Securities
The following table summarizes the cost and estimated fair values of the Company's investment in equity securities, FHLBB stock and FRBB stock as presented within other investments on the consolidated statements of condition, as of the dates indicated: 
(In thousands)
 
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair Value /
Carrying Value
March 31, 2020
 
 

 
 

 
 

 
 

Equity securities - bank stock (carried at fair value)
 
$
544

 
$
1,130

 
$
—

 
$
1,674

FHLBB (carried at cost)
 
8,008

 
—

 
—

 
8,008

FRB (carried at cost)
 
5,374

 
—

 
—

 
5,374

Total other investments
 
$
13,926

 
$
1,130

 
$
—

 
$
15,056

December 31, 2019
 
 

 
 

 
 

 
 

Equity securities - bank stock (carried at fair value)
 
$
544

 
$
1,130

 
$
—

 
$
1,674

FHLBB (carried at cost)
 
6,601

 
—

 
—

 
6,601

FRB (carried at cost)
 
5,374

 
—

 
—

 
5,374

Total other investments
 
$
12,519

 
$
1,130

 
$
—

 
$
13,649



The following table summarizes the amortized cost and estimated fair values of AFS and HTM investments, as of the dates indicated: 
(In thousands)
 
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair
Value
March 31, 2020
 
 

 
 

 
 

 
 

AFS Investments (carried at fair value):
 
 
 
 
 
 
 
 
Obligations of states and political subdivisions
 
$
123,893

 
$
3,324

 
$
(337
)
 
$
126,880

Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
 
472,508

 
15,618

 
(77
)
 
488,049

Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
 
324,929

 
9,698

 
(12
)
 
334,615

Subordinated corporate bonds
 
10,546

 
116

 
(75
)
 
10,587

Total AFS investments
 
$
931,876

 
$
28,756

 
$
(501
)
 
$
960,131

HTM Investments (carried at amortized cost):
 
 
 
 
 
 
 
 
Obligations of states and political subdivisions
 
$
1,300

 
$
58

 
$
—

 
$
1,358

Total HTM investments
 
$
1,300

 
$
58

 
$
—

 
$
1,358

December 31, 2019
 
 

 
 

 
 

 
 

AFS Investments (carried at fair value):
 
 
 
 
 
 
 
 
Obligations of states and political subdivisions
 
$
115,632

 
$
2,779

 
$
(328
)
 
$
118,083

Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
 
462,593

 
3,398

 
(2,605
)
 
463,386

Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
 
325,200

 
3,183

 
(2,478
)
 
325,905

Subordinated corporate bonds
 
10,553

 
191

 
—

 
10,744

Total AFS investments
 
$
913,978

 
$
9,551

 
$
(5,411
)
 
$
918,118

HTM Investments (carried at amortized cost):
 
 
 
 
 
 
 
 
Obligations of states and political subdivisions
 
$
1,302

 
$
57

 
$
—

 
$
1,359

Total HTM investments
 
$
1,302

 
$
57

 
$
—

 
$
1,359
Unrealized Gross Losses and Estimated Fair Values of Investment Securities by Length of Time that Individual Securities in Each Category in Continuous Loss Position
The following table presents the estimated fair values and gross unrealized losses on AFS and HTM investments that were in a continuous loss position that was considered temporary, by length of time that an individual security in each category has been in a continuous loss position as of the dates indicated:  
 
 
 
 
Less Than 12 Months
 
12 Months or More
 
Total
(In thousands, except number of holdings)
 
Number of
Holdings
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
March 31, 2020
 
 
 
 

 
 

 
 

 
 

 
 

 
 

AFS Investments:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Obligations of states and political subdivisions
 
168

 
$
20,029

 
$
(337
)
 
$
—

 
$
—

 
$
20,029

 
$
(337
)
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
 
144

 
7,626

 
(34
)
 
1,638

 
(43
)
 
9,264

 
(77
)
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
 
86

 
5,180

 
(12
)
 
—

 
—

 
5,180

 
(12
)
Subordinated corporate bonds
 
8

 
4,925

 
(75
)
 
—

 
—

 
4,925

 
(75
)
Total AFS investments
 
406

 
$
37,760

 
$
(458
)
 
$
1,638

 
$
(43
)
 
$
39,398

 
$
(501
)
December 31, 2019
 
 
 
 

 
 

 
 

 
 

 
 

 
 

AFS Investments:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Obligations of states and political subdivisions
 
11

 
$
30,459

 
$
(328
)
 
$
—

 
$
—

 
$
30,459

 
$
(328
)
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
 
59

 
162,964

 
(1,850
)
 
63,633

 
(755
)
 
226,597

 
(2,605
)
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
 
35

 
66,549

 
(733
)
 
68,614

 
(1,745
)
 
135,163

 
(2,478
)
Total AFS investments
 
105

 
$
259,972

 
$
(2,911
)
 
$
132,247

 
$
(2,500
)
 
$
392,219

 
$
(5,411
)
Schedule of Sale of AFS Investments

Amortized Cost and Estimated Fair Values of Debt Securities by Contractual Maturity
The amortized cost and estimated fair values of the Company's AFS and HTM investments by contractual maturity at March 31, 2020, are shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. 
(In thousands)
 
Amortized
Cost
 
Fair
Value
AFS Investments
 
 
 
 
Due in one year or less
 
$
—

 
$
—

Due after one year through five years
 
76,517

 
78,367

Due after five years through ten years
 
215,515

 
223,272

Due after ten years
 
639,844

 
658,492

Total
 
$
931,876

 
$
960,131

HTM Investments
 
 
 
 
Due in one year or less
 
$
—

 
$
—

Due after one year through five years
 
511

 
532

Due after five years through ten years
 
789

 
826

Due after ten years
 
—

 
—

Total
 
$
1,300

 
$
1,358