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INVESTMENTS (Tables)
 6 Months Ended
Jun. 30, 2019
Investments, Debt and Equity Securities [Abstract]  
Summary of Amortized Costs and Estimated Fair Values of Available-For-Sale Securities
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
June 30, 2019
 
 

 
 

 
 

 
 

AFS Investments (carried at fair value):
 
 
 
 
 
 
 
 
Obligations of states and political subdivisions
 
$
87,223

 
$
1,932

 
$
(26
)
 
$
89,129

Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
 
455,330

 
3,250

 
(2,203
)
 
456,377

Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
 
351,149

 
3,940

 
(3,018
)
 
352,071

Subordinated corporate bonds
 
21,397

 
1,109

 
—

 
22,506

Total AFS investments
 
$
915,099

 
$
10,231

 
$
(5,247
)
 
$
920,083

HTM Investments (carried at amortized cost):
 
 
 
 
 
 
 
 
Obligations of states and political subdivisions
 
$
1,304

 
$
31

 
$
—

 
$
1,335

Total HTM investments
 
$
1,304

 
$
31

 
$
—

 
$
1,335

December 31, 2018
 
 

 
 

 
 

 
 

AFS Investments (carried at fair value):
 
 
 
 
 
 
 
 
Obligations of states and political subdivisions
 
$
94,430

 
$
216

 
$
(894
)
 
$
93,752

Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
 
466,613

 
583

 
(13,524
)
 
453,672

Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
 
351,958

 
1,007

 
(10,071
)
 
342,894

Subordinated corporate bonds
 
20,398

 
23

 
(47
)
 
20,374

Total AFS investments
 
$
933,399

 
$
1,829

 
$
(24,536
)
 
$
910,692

HTM Investments (carried at amortized cost):
 
 
 
 
 
 
 
 
Obligations of states and political subdivisions
 
$
1,307

 
$
8

 
$
(24
)
 
$
1,291

Total HTM investments
 
$
1,307

 
$
8

 
$
(24
)
 
$
1,291



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
June 30, 2019
 
 

 
 

 
 

 
 

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

 
$
286

 
$
—

 
$
830

FHLBB (carried at cost)
 
5,509

 
—

 
—

 
5,509

FRB (carried at cost)
 
5,374

 
—

 
—

 
5,374

Total other investments
 
$
11,427

 
$
286

 
$
—

 
$
11,713

December 31, 2018
 
 

 
 

 
 

 
 

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

 
$
202

 
$
—

 
$
746

FHLBB (carried at cost)
 
8,559

 
—

 
—

 
8,559

FRB (carried at cost)
 
5,374

 
—

 
—

 
5,374

Total other investments
 
$
14,477

 
$
202

 
$
—

 
$
14,679
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 at June 30, 2019 and December 31, 2018, by length of time that an individual security in each category has been in a continuous loss position:  
 
 
Less Than 12 Months
 
12 Months or More
 
Total
(In thousands)
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
June 30, 2019
 
 

 
 

 
 

 
 

 
 

 
 

AFS Investments:
 
 
 
 
 
 
 
 
 
 
 
 
Obligations of states and political subdivisions
 
$
—

 
$
—

 
$
4,051

 
$
(26
)
 
$
4,051

 
$
(26
)
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
 
—

 
—

 
246,463

 
(2,203
)
 
246,463

 
(2,203
)
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
 
—

 
—

 
136,876

 
(3,018
)
 
136,876

 
(3,018
)
Total AFS investments
 
$
—

 
$
—

 
$
387,390

 
$
(5,247
)
 
$
387,390

 
$
(5,247
)
December 31, 2018
 
 

 
 

 
 

 
 

 
 

 
 

AFS Investments:
 
 
 
 
 
 
 
 
 
 
 
 
Obligations of states and political subdivisions
 
$
36,218

 
$
(281
)
 
$
28,437

 
$
(613
)
 
$
64,655

 
$
(894
)
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
 
46,459

 
(252
)
 
364,430

 
(13,272
)
 
410,889

 
(13,524
)
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
 
5,956

 
(40
)
 
227,461

 
(10,031
)
 
233,417

 
(10,071
)
Subordinated corporate bonds
 
11,378

 
(26
)
 
966

 
(21
)
 
12,344

 
(47
)
Total AFS investments
 
$
100,011

 
$
(599
)
 
$
621,294

 
$
(23,937
)
 
$
721,305

 
$
(24,536
)
HTM Investments:
 
 
 
 
 
 
 
 
 
 
 
 
Obligations of states and political subdivisions
 
$
509

 
$
(5
)
 
$
411

 
$
(19
)
 
$
920

 
$
(24
)
Total HTM investments
 
$
509

 
$
(5
)
 
$
411

 
$
(19
)
 
$
920

 
$
(24
)
Schedule of Sale of AFS Investments
The following table details the Company's sales of AFS investments for the period indicated below:
 
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
(In thousands)
 
2019
 
2018
 
2019
 
2018
Proceeds from sales of investments
 
$
45,826

 
$
9,898

 
$
45,826

 
$
9,898

Gross realized gains
 
371

 
31

 
371

 
31

Gross realized losses
 
(344
)
 
—

 
(344
)
 
—
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 June 30, 2019, 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
 
69,611

 
69,758

Due after five years through ten years
 
231,573

 
234,217

Due after ten years
 
613,916

 
616,108

 
 
$
915,100

 
$
920,083

HTM Investments
 
 
 
 
Due in one year or less
 
$
—

 
$
—

Due after one year through five years
 
—

 
—

Due after five years through ten years
 
1,304

 
1,335

Due after ten years
 
—

 
—

 
 
$
1,304

 
$
1,335