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SECURITIES AVAILABLE FOR SALE (Tables)
12 Months Ended
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]  
Summary of Securities Available for Sale

Gross

Gross

 Unrealized

 Unrealized

(in thousands)

    

Amortized Cost

    

 Gains

    

 Losses

    

Fair Value

December 31, 2020

 

  

 

  

 

  

 

  

Mortgage-backed securities:

 

  

 

  

 

  

 

  

US Government-sponsored enterprises

$

206,834

$

6,018

$

(462)

$

212,390

US Government agency

 

82,878

 

2,870

 

(116)

 

85,632

Private label

 

19,810

 

40

 

(141)

 

19,709

Obligations of states and political subdivisions thereof

 

164,766

 

4,244

 

(6)

 

169,004

Corporate bonds

 

97,689

 

1,465

 

(843)

 

98,311

Total securities available for sale

$

571,977

$

14,637

$

(1,568)

$

585,046

Gross

Gross

 Unrealized

 Unrealized

(in thousands)

    

Amortized Cost

    

 Gains

    

 Losses

    

Fair Value

December 31, 2019

 

  

 

  

 

  

 

  

Mortgage-backed securities:

 

  

 

  

 

  

 

  

US Government-sponsored enterprises

$

319,064

$

4,985

$

(2,080)

$

321,969

US Government agency

 

98,568

 

1,640

 

(547)

 

99,661

Private label

 

20,212

 

68

 

(747)

 

19,533

Obligations of states and political subdivisions thereof

 

139,332

 

2,942

 

(268)

 

142,006

Corporate bonds

 

78,804

 

1,478

 

(221)

 

80,061

Total securities available for sale

$

655,980

$

11,113

$

(3,863)

$

663,230

Schedule of Amortized Cost and Estimated Fair Value of Available for Sale (AFS) Securities, Segregated by Contractual Maturity

Available for sale

(in thousands)

    

Amortized Cost

    

Fair Value

Within 1 year

 

$

$

Over 1 year to 5 years

 

20,566

 

20,963

Over 5 years to 10 years

 

76,456

 

76,598

Over 10 years

 

165,433

 

169,752

Total bonds and obligations

 

262,455

 

267,313

Mortgage-backed securities

 

309,522

 

317,733

Total securities available for sale

$

571,977

$

585,046

Schedule of Gains and Losses from Sale of AFS Securities

Proceeds from Sale

of Securities

(in thousands)

    

Available for Sale

    

Realized Gains

    

Realized Losses

    

Net

2020

$

153,200

$

5,492

$

(47)

$

5,445

2019

92,315

993

(756)

237

2018

 

29,107

(924)

 

(924)

Schedule of Securities with Unrealized Losses, Segregated by the Duration of Continuous Unrealized Loss Positions

Less Than Twelve Months

Over Twelve Months

Total

Gross

    

    

Gross

    

    

Gross

    

Unrealized

Fair

Unrealized

Fair

Unrealized 

Fair

(in thousands)

    

Losses

    

Value

    

Losses

    

Value

    

Losses

    

Value

December 31, 2020

 

  

 

  

 

  

 

  

 

  

 

  

Mortgage-backed securities:

 

  

 

  

 

  

 

  

 

  

 

  

US Government-sponsored enterprises

$

209

$

40,285

$

253

$

4,323

$

462

$

44,608

US Government agency

 

45

 

6,776

 

71

 

3,297

 

116

 

10,073

Private label

 

 

 

141

 

19,514

 

141

 

19,514

Obligations of states and political subdivisions thereof

 

6

 

5,577

 

 

 

6

 

5,577

Corporate bonds

 

555

 

21,774

 

288

 

11,712

 

843

 

33,486

Total securities available for sale

$

815

$

74,412

$

753

$

38,846

$

1,568

$

113,258

Less Than Twelve Months

Over Twelve Months

Total

    

Gross

    

    

Gross

    

    

Gross

    

Unrealized

Fair

Unrealized

Fair

Unrealized 

Fair

(in thousands)

Losses

Value

Losses

Value

Losses

Value

December 31, 2019

 

  

 

  

 

  

 

  

 

  

 

  

Mortgage-backed securities:

 

  

 

  

 

  

 

  

 

  

 

  

US Government-sponsored enterprises

$

1,074

$

43,429

$

1,006

$

49,712

$

2,080

$

93,141

US Government agency

 

432

 

19,717

 

115

 

9,120

 

547

 

28,837

Private label

 

380

 

9,843

 

367

 

9,411

 

747

 

19,254

Obligations of states and political subdivisions thereof

 

137

 

29,355

 

131

 

1,682

 

268

 

31,037

Corporate bonds

 

142

 

9,888

 

79

 

12,276

 

221

 

22,164

Total securities available for sale

$

2,165

$

112,232

$

1,698

$

82,201

$

3,863

$

194,433

Summary of Securities Pledged as Collateral

December 31, 2020

December 31, 2019

    

Carrying 

    

Estimated

    

Carrying 

    

Estimated

(in thousands)

Value

 Fair Value

Value

 Fair Value

Securities pledged for deposits

$

83,805

$

92,862

$

217,009

$

220,054

Securities pledged for repurchase agreements

 

37,444

 

39,119

 

96,007

 

96,477

Securities pledged for borrowings (1)

 

48,725

 

51,913

 

157,172

 

157,458

Total securities pledged

$

169,974

$

183,894

$

470,188

$

473,989

(1)The Bank pledged securities as collateral for certain borrowing arrangements with the Federal Home Loan Bank of Boston and Federal Reserve Bank of Boston.
Schedule of Other Than Temporary Impairment Losses

Twelve Months Ended December 31, 

(in thousands)

    

2020

    

2019

    

2018

Estimated credit losses as of prior year-end

$

1,697

$

1,697

$

1,697

Reductions for securities paid off during the period

 

 

 

Estimated credit losses at end of the period

$

1,697

$

1,697

$

1,697