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Investment Securities (Tables)
9 Months Ended
Sep. 30, 2023
Investment Securities  
Available-for-sale Securities

Available-for-sale securities are summarized as follows as of the dates indicated:

September 30, 2023

    

Amortized

    

Gross

    

Gross

    

cost

unrealized gains

unrealized losses

Fair value

U.S. Treasury securities

$

74,386

$

$

(2,524)

$

71,862

Mortgage-backed securities:

Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises

240,292

14

(43,458)

196,848

Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises

 

430,853

 

 

(81,911)

 

348,942

Municipal securities

155

(3)

152

Corporate debt

2,000

(151)

1,849

Other securities

 

792

 

 

 

792

Total investment securities available-for-sale

$

748,478

$

14

$

(128,047)

$

620,445

December 31, 2022

    

Amortized

    

Gross

    

Gross

    

cost

unrealized gains

unrealized losses

Fair value

U.S. Treasury securities

$

74,031

$

$

(2,643)

$

71,388

Mortgage-backed securities:

Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises

263,939

1

(37,809)

226,131

Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises

 

478,866

 

 

(72,940)

 

405,926

Municipal securities

155

(2)

153

Corporate debt

2,000

(80)

1,920

Other securities

 

771

 

 

 

771

Total investment securities available-for-sale

$

819,762

$

1

$

(113,474)

$

706,289

Summary of unrealized losses for available-for-sale securities

The tables below summarize the available-for-sale securities with unrealized losses as of the dates shown, along with the length of the impairment period:

September 30, 2023

Less than 12 months

12 months or more

Total

    

Fair

    

Unrealized

    

Fair

    

Unrealized

    

Fair

    

Unrealized

value

losses

value

losses

value

losses

U.S. Treasury securities

$

$

$

71,862

$

(2,524)

$

71,862

$

(2,524)

Mortgage-backed securities:

Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises

16

(1)

193,918

(43,457)

193,934

(43,458)

Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises

136

(4)

348,806

(81,907)

348,942

(81,911)

Municipal securities

152

(3)

152

(3)

Corporate debt

1,849

(151)

1,849

(151)

Total

$

152

$

(5)

$

616,587

$

(128,042)

$

616,739

$

(128,047)

December 31, 2022

Less than 12 months

12 months or more

Total

    

Fair

    

Unrealized

    

Fair

    

Unrealized

    

Fair

    

Unrealized

value

losses

value

losses

value

losses

U.S. Treasury securities

$

71,388

$

(2,643)

$

$

$

71,388

$

(2,643)

Mortgage-backed securities:

Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises

83,748

(6,686)

141,272

(31,123)

225,020

(37,809)

Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises

196,449

(22,809)

209,477

(50,131)

405,926

(72,940)

Municipal securities

153

(2)

153

(2)

Corporate debt

1,920

(80)

1,920

(80)

Total

$

353,658

$

(32,220)

$

350,749

$

(81,254)

$

704,407

$

(113,474)

Schedule of credit quality indicators, by fair value, of available-for-sale securities

The tables below summarize the credit quality indicators, by fair value, of available-for-sale securities as of the dates shown:

September 30, 2023

AAA

Not rated

Total

U.S. Treasury securities

$

71,862

$

$

71,862

Mortgage-backed securities:

Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises

196,848

196,848

Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises

348,942

348,942

Municipal securities

152

152

Corporate debt

1,849

1,849

Other securities

 

 

792

 

792

Total investment securities available-for-sale

$

617,652

$

2,793

$

620,445

December 31, 2022

AAA

Not rated

Total

U.S. Treasury securities

$

71,388

$

$

71,388

Mortgage-backed securities:

Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises

226,131

226,131

Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises

405,926

405,926

Municipal securities

153

153

Corporate debt

1,920

1,920

Other securities

 

 

771

 

771

Total investment securities available-for-sale

$

703,445

$

2,844

$

706,289

Summary of available-for-sale and held-to-maturity securities by maturity

A summary of the available-for-sale securities by maturity is shown in the following table as of September 30, 2023. Mortgage-backed securities may have actual maturities that differ from contractual maturities depending on the repayment characteristics and experience of the underlying financial instruments and are therefore not included in the table below. Additionally, the Company holds other available-for-sale securities with an amortized cost and fair value of $0.8 million that have no stated contractual maturity date.

September 30, 2023

Weighted

Amortized Cost

Fair Value

Average Yield

U.S. Treasury securities

Within one year

$

24,917

$

24,598

2.30%

After one but within five years

49,469

47,264

2.67%

Municipal securities

After one but within five years

155

152

3.17%

Corporate debt

After five but within ten years

2,000

1,849

5.87%

A summary of the held-to-maturity securities by maturity is shown in the following table as of September 30, 2023. Actual maturities of mortgage-backed securities may differ from scheduled maturities depending on the repayment characteristics and experience of the underlying financial instruments and are therefore not included in the table below.

September 30, 2023

Weighted

Amortized Cost

Fair Value

Average Yield

U.S. Treasury securities

After one but within five years

$

49,263

$

47,415

3.14%

Held-to-maturity Securities

Held-to-maturity investment securities are summarized as follows as of the dates indicated:

September 30, 2023

    

    

Gross

    

Gross

    

Amortized

unrealized

unrealized

cost

gains

losses

Fair value

U.S. Treasury securities

$

49,263

$

$

(1,848)

$

47,415

Mortgage-backed securities:

Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises

309,216

(49,023)

260,193

Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises

 

242,022

 

 

(55,388)

 

186,634

Total investment securities held-to-maturity

$

600,501

$

$

(106,259)

$

494,242

December 31, 2022

    

    

Gross

    

Gross

    

Amortized

unrealized

unrealized

cost

gains

losses

Fair value

U.S. Treasury securities

$

49,045

$

$

(1,416)

$

47,629

Mortgage-backed securities:

Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises

339,815

163

(41,162)

298,816

Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises

 

262,667

 

 

(49,188)

 

213,479

Total investment securities held-to-maturity

$

651,527

$

163

$

(91,766)

$

559,924

Summary of unrealized losses for held-to-maturity securities

The held-to-maturity portfolio included 160 securities in an unrealized loss position as of September 30, 2023, compared to 129 securities at December 31, 2022. The tables below summarize the held-to-maturity securities with unrealized losses as of the dates shown, along with the length of the impairment period:

September 30, 2023

Less than 12 months

12 months or more

Total

    

Fair

    

Unrealized

    

Fair

    

Unrealized

    

Fair

    

Unrealized

value

losses

value

losses

value

losses

U.S. Treasury securities

$

$

$

47,415

$

(1,848)

$

47,415

$

(1,848)

Mortgage-backed securities:

Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises

53,423

(2,086)

206,771

(46,937)

260,194

(49,023)

Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises

3,882

(170)

182,752

(55,218)

186,634

(55,388)

Total

$

57,305

$

(2,256)

$

436,938

$

(104,003)

$

494,243

$

(106,259)

December 31, 2022

Less than 12 months

12 months or more

Total

    

Fair

    

Unrealized

    

Fair

    

Unrealized

    

Fair

    

Unrealized

value

losses

value

losses

value

losses

U.S. Treasury securities

$

47,629

$

(1,416)

$

$

$

47,629

$

(1,416)

Mortgage-backed securities:

Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises

83,323

(3,804)

182,159

(37,358)

265,482

(41,162)

Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises

34,704

(1,145)

178,776

(48,043)

213,480

(49,188)

Total

$

165,656

$

(6,365)

$

360,935

$

(85,401)

$

526,591

$

(91,766)

Schedule of credit quality indicators, by amortized cost, of held-to-maturity securities

The tables below summarize the credit quality indicators, by amortized cost, of held-to-maturity securities as of the dates shown:

September 30, 2023

AAA

U.S. Treasury securities

$

49,263

Mortgage-backed securities:

Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises

309,216

Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises

 

242,022

Total investment securities held-to-maturity

$

600,501

December 31, 2022

AAA

U.S. Treasury securities

$

49,045

Mortgage-backed securities:

Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises

339,815

Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises

 

262,667

Total investment securities held-to-maturity

$

651,527