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SECURITIES
 3 Months Ended
Mar. 31, 2017
Investments, Debt and Equity Securities [Abstract]  
SECURITIES
SECURITIES
 
The following tables summarize the amortized cost and estimated fair values of AFS and HTM securities, as of the dates indicated: 
 
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair
Value
March 31, 2017
 

 
 

 
 

 
 

AFS Securities:
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
8,156

 
$
130

 
$
—

 
$
8,286

Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
526,135

 
2,392

 
(7,030
)
 
521,497

Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
292,901

 
172

 
(6,064
)
 
287,009

Subordinated corporate bonds
5,483

 
190

 
—

 
5,673

Total AFS debt securities
832,675

 
2,884

 
(13,094
)
 
822,465

Equity securities
632

 
144

 
—

 
776

Total AFS securities
$
833,307

 
$
3,028

 
$
(13,094
)
 
$
823,241

HTM Securities:
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
94,474

 
$
583

 
$
(713
)
 
$
94,344

Total HTM securities
$
94,474

 
$
583

 
$
(713
)
 
$
94,344

December 31, 2016
 

 
 

 
 

 
 

AFS Securities:
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
8,848

 
$
153

 
$
—

 
$
9,001

Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
485,222

 
2,515

 
(7,115
)
 
480,622

Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
289,046

 
265

 
(5,421
)
 
283,890

Subordinated corporate bonds
5,481

 
132

 
—

 
5,613

Total AFS debt securities
788,597

 
3,065

 
(12,536
)
 
779,126

Equity securities
632

 
109

 
—

 
741

Total AFS securities
$
789,229

 
$
3,174

 
$
(12,536
)
 
$
779,867

HTM Securities:
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
94,609

 
$
618

 
$
(631
)
 
$
94,596

Total HTM securities
$
94,609

 
$
618

 
$
(631
)
 
$
94,596


 
Net unrealized losses on AFS securities at March 31, 2017 included in AOCI amounted to $6.5 million, net of a deferred tax benefit of $3.5 million. Net unrealized losses on AFS securities at December 31, 2016 included in AOCI amounted to $6.1 million, net of a deferred tax benefit of $3.3 million.

During the first three months of 2017, the Company purchased investment securities totaling $77.3 million, all of which were designated as AFS securities.

During the first three months of 2016, the Company purchased investment securities totaling $70.8 million. The Company designated $66.9 million as AFS securities and $3.9 million as HTM securities.

Impaired Securities
Management periodically reviews the Company’s investment portfolio to determine the cause, magnitude and duration of declines in the fair value of each security. Thorough evaluations of the causes of the unrealized losses are performed to determine whether the impairment is temporary or other-than-temporary in nature. Considerations such as the ability of the securities to meet cash flow requirements, levels of credit enhancements, risk of curtailment, and recoverability of invested amount over a reasonable period of time, and the length of time the security is in a loss position, for example, are applied in determining OTTI. Once a decline in value is determined to be other-than-temporary, the cost basis of the security is permanently reduced and a corresponding charge to earnings is recognized.
 
The following table presents the estimated fair values and gross unrealized losses of investment securities that were in a continuous loss position at March 31, 2017 and December 31, 2016, by length of time that individual securities in each category have been in a continuous loss position:  
 
Less Than 12 Months
 
12 Months or More
 
Total
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
March 31, 2017
 

 
 

 
 

 
 

 
 

 
 

AFS Securities:
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
$
393,109

 
$
(5,745
)
 
$
28,177

 
$
(1,285
)
 
$
421,286

 
$
(7,030
)
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
193,320

 
(3,114
)
 
70,552

 
(2,950
)
 
263,872

 
(6,064
)
Total AFS securities
$
586,429

 
$
(8,859
)
 
$
98,729

 
$
(4,235
)
 
$
685,158

 
$
(13,094
)
HTM Securities:
 
 
 
 
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
45,174

 
$
(713
)
 
$
—

 
$
—

 
$
45,174

 
$
(713
)
Total HTM securities
$
45,174

 
$
(713
)
 
$
—

 
$
—

 
$
45,174

 
$
(713
)
December 31, 2016
 

 
 

 
 

 
 

 
 

 
 

AFS Securities:
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
$
348,579

 
$
(5,780
)
 
$
29,496

 
$
(1,335
)
 
$
378,075

 
$
(7,115
)
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
163,412

 
(2,906
)
 
74,212

 
(2,515
)
 
237,624

 
(5,421
)
Total AFS securities
$
511,991

 
$
(8,686
)
 
$
103,708

 
$
(3,850
)
 
$
615,699

 
$
(12,536
)
HTM Securities:
 
 
 
 
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
42,805

 
$
(631
)
 
$
—

 
$
—

 
$
42,805

 
$
(631
)
Total HTM securities
$
42,805

 
$
(631
)
 
$
—

 
$
—

 
$
42,805

 
$
(631
)


At March 31, 2017 and December 31, 2016, the Company held 232 and 209 investment securities with a fair value of $730.3 million and $658.5 million that were in an unrealized loss position totaling $13.8 million and $13.2 million, respectively, that were considered temporary. Of these, MBS and CMOs with a fair value of $98.7 million were in an unrealized loss position totaling $4.2 million at March 31, 2017 and MBS and CMOs with a fair value of $103.7 million were in an unrealized loss position totaling $3.9 million at December 31, 2016 for 12 months or more. The unrealized loss was reflective of current interest rates in excess of the yield received on investments and is not indicative of an overall change in credit quality or other factors with the Company's investment portfolio. At March 31, 2017 and December 31, 2016, gross unrealized losses on the Company's AFS and HTM securities were 2% of the respective investment securities fair value.

The Company has the intent and ability to retain its investment securities in an unrealized loss position at March 31, 2017 until the decline in value has recovered.

Sale of Securities
For the three months ended March 31, 2017 and 2016, the Company did not sell any investment securities.

FHLBB and FRB Stock
As of March 31, 2017 and December 31, 2016, the Company's investment in FHLBB stock was $20.0 million and $17.8 million, respectively. As of March 31, 2017 and December 31, 2016, the Company's investment in FRB stock was $5.4 million.

Securities Pledged
At March 31, 2017 and December 31, 2016, securities with an amortized cost of $604.0 million and $597.3 million and estimated fair values of $595.7 million and $589.7 million, respectively, were pledged to secure FHLBB advances, public deposits, and securities sold under agreements to repurchase and for other purposes required or permitted by law.
 
Contractual Maturities
The amortized cost and estimated fair values of debt securities by contractual maturity at March 31, 2017, 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. 
 
Amortized
Cost
 
Fair
Value
AFS Securities
 
 
 
Due in one year or less
$
1,585

 
$
1,587

Due after one year through five years
88,748

 
88,607

Due after five years through ten years
170,189

 
169,920

Due after ten years
572,153

 
562,351

 
$
832,675

 
$
822,465

HTM Securities
 
 
 
Due in one year or less
$
762

 
$
768

Due after one year through five years
4,801

 
4,870

Due after five years through ten years
4,561

 
4,622

Due after ten years
84,350

 
84,084

 
$
94,474

 
$
94,344