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INVESTMENTS (Tables)
 3 Months Ended
Mar. 31, 2018
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 securities, as of the dates indicated: 
 
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair
Value
March 31, 2018
 

 
 

 
 

 
 

AFS Investments (carried at fair value):
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
5,776

 
$
55

 
$
(4
)
 
$
5,827

Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
517,823

 
490

 
(15,317
)
 
502,996

Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
293,371

 
6

 
(11,098
)
 
282,279

Subordinated corporate bonds
5,485

 
119

 
(19
)
 
5,585

Total AFS investments
$
822,455

 
$
670

 
$
(26,438
)
 
$
796,687

HTM Investments (carried at amortized cost):
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
93,192

 
$
130

 
$
(1,448
)
 
$
91,874

Total HTM investments
$
93,192

 
$
130

 
$
(1,448
)
 
$
91,874

December 31, 2017
 

 
 

 
 

 
 

AFS Investments (carried at fair value):
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
7,232

 
$
103

 
$
—

 
$
7,335

Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
510,176

 
597

 
(7,471
)
 
503,302

Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
279,575

 
14

 
(6,790
)
 
272,799

Subordinated corporate bonds
5,484

 
173

 
—

 
5,657

Equity investments(1)
554

 
252

 
—

 
806

Total AFS investments
$
803,021

 
$
1,139

 
$
(14,261
)
 
$
789,899

HTM Investments (carried at amortized cost):
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
94,073

 
$
1,077

 
$
(237
)
 
$
94,913

Total HTM investments
$
94,073

 
$
1,077

 
$
(237
)
 
$
94,913

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: 
 
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair
Value
March 31, 2018
 

 
 

 
 

 
 

Equity securities - bank stock (carried at fair value)(1)
$
544

 
$
217

 
$
—

 
$
761

FHLBB (carried at cost)
17,639

 
—

 
—

 
17,639

FRB (carried at cost)
5,374

 
—

 
—

 
5,374

Total other investments
$
23,557

 
$
217

 
$
—

 
$
23,774

December 31, 2017
 

 
 

 
 

 
 

FHLBB (carried at cost)
$
18,296

 
$
—

 
$
—

 
$
18,296

FRB (carried at cost)
5,374

 
—

 
—

 
5,374

Total other investments
$
23,670

 
$
—

 
$
—

 
$
23,670
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 March 31, 2018 and December 31, 2017, 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
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
March 31, 2018
 

 
 

 
 

 
 

 
 

 
 

AFS Investments:
 
 
 
 
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
1,516

 
$
(4
)
 
$
—

 
$
—

 
$
1,516

 
$
(4
)
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
236,851

 
(5,661
)
 
233,957

 
(9,656
)
 
470,808

 
(15,317
)
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
122,669

 
(2,308
)
 
154,622

 
(8,790
)
 
277,291

 
(11,098
)
Subordinated corporate bonds
965

 
(19
)
 
—

 
—

 
965

 
(19
)
Total AFS investments
$
362,001

 
$
(7,992
)
 
$
388,579

 
$
(18,446
)
 
$
750,580

 
$
(26,438
)
HTM Investments:
 
 
 
 
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
62,815

 
$
(958
)
 
$
10,225

 
$
(490
)
 
$
73,040

 
$
(1,448
)
Total HTM investments
$
62,815

 
$
(958
)
 
$
10,225

 
$
(490
)
 
$
73,040

 
$
(1,448
)
December 31, 2017
 

 
 

 
 

 
 

 
 

 
 

AFS Investments:
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
$
221,466

 
$
(2,393
)
 
$
233,971

 
$
(5,078
)
 
$
455,437

 
$
(7,471
)
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
102,612

 
(696
)
 
164,389

 
(6,094
)
 
267,001

 
(6,790
)
Total AFS investments
$
324,078

 
$
(3,089
)
 
$
398,360

 
$
(11,172
)
 
$
722,438

 
$
(14,261
)
HTM Investments:
 
 
 
 
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
9,317

 
$
(57
)
 
$
9,436

 
$
(180
)
 
$
18,753

 
$
(237
)
Total HTM investments
$
9,317

 
$
(57
)
 
$
9,436

 
$
(180
)
 
$
18,753

 
$
(237
)
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, 2018, 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 Investments
 
 
 
Due in one year or less
$
5,307

 
$
5,302

Due after one year through five years
112,412

 
110,253

Due after five years through ten years
213,112

 
206,368

Due after ten years
491,624

 
474,764

 
$
822,455

 
$
796,687

HTM Investments
 
 
 
Due in one year or less
$
1,418

 
$
1,418

Due after one year through five years
3,783

 
3,796

Due after five years through ten years
13,035

 
12,954

Due after ten years
74,956

 
73,706

 
$
93,192

 
$
91,874