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Investment Securities (Tables)

12 Months Ended

Dec. 31, 2023

Investment Securities

Available-for-sale Securities

​

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

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

December 31, 2023

​

Amortized

Gross

Gross

​

​

​

​

cost

​

unrealized gains

​

unrealized losses

​

Fair value

U.S. Treasury securities

​

$

74,508

​

$

—

​

$

(1,464)

​

$

73,044

Mortgage-backed securities:

​

​

​

​

​

​

​

​

​

​

​

​

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

​

​

233,264

​

​

57

​

​

(31,512)

​

​

201,809

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

​

417,155

​

—

​

(65,913)

​

351,242

Municipal securities

​

​

80

​

​

—

​

​

(1)

​

​

79

Corporate debt

​

​

2,000

​

​

—

​

​

(157)

​

​

1,843

Other securities

​

812

​

—

​

—

​

812

Total investment securities available-for-sale

​

$

727,819

​

$

57

​

$

(99,047)

​

$

628,829

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

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:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

December 31, 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

​

$

—

​

$

—

​

$

73,044

​

$

(1,464)

​

$

73,044

​

$

(1,464)

Mortgage-backed securities:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

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

​

​

9

​

​

—

​

​

199,000

​

​

(31,512)

​

​

199,009

​

​

(31,512)

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

​

​

138

​

​

(1)

​

​

351,104

​

​

(65,912)

​

​

351,242

​

​

(65,913)

Municipal securities

​

​

—

​

​

—

​

​

79

​

​

(1)

​

​

79

​

​

(1)

Corporate debt

​

​

—

​

​

—

​

​

1,843

​

​

(157)

​

​

1,843

​

​

(157)

Total

​

$

147

​

$

(1)

​

$

625,070

​

$

(99,046)

​

$

625,217

​

$

(99,047)

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

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

​

​	​	​	​	​	​	​	​	​	​
​	​	December 31, 2023
​	​	AAA		​	Not rated		​	Total
U.S. Treasury securities	​	$	73,044	​	$	—	​	$	73,044
Mortgage-backed securities:	​	​	​	​	​	​	​	​	​
Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises	​	​	201,809	​	​	—	​	​	201,809
Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises	​	​	351,242	​	​	—	​	​	351,242
Municipal securities	​	​	—	​	​	79	​	​	79
Corporate debt	​	​	—	​	​	1,843	​	​	1,843
Other securities	​		—	​		812	​		812
Total investment securities available-for-sale	​	$	626,095	​	$	2,734	​	$	628,829

​

​	​	​	​	​	​	​	​	​	​
​	​	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

​

​	​	​	​	​	​	​	​	​
​	​	December 31, 2023
​	​	​	​	​	​	​	​	Weighted
​	​	Amortized Cost		​	Fair Value		​	Average Yield
U.S. Treasury securities	​	​	​	​	​	​	​	​
Within one year	​	$	24,967	​	$	24,848	​	2.30%
After one but within five years	​	​	49,541	​	​	48,196	​	2.67%
Municipal securities	​	​	​	​	​	​	​	​
Within one year	​	​	80	​	​	79	​	3.17%
Corporate debt	​	​	​	​	​	​	​	​
After five but within ten years	​	​	2,000	​	​	1,843	​	5.87%

​

​	​	​	​	​	​	​	​	​
​	​	December 31, 2023
​	​	​	​	​	​	​	​	Weighted
​	​	Amortized Cost		​	Fair Value		​	Average Yield
U.S. Treasury securities	​	​	​	​	​	​	​	​
After one but within five years	​	$	49,338	​	$	48,334	​	3.14%

Held-to-maturity Securities

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

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

December 31, 2023

​

​

​

Gross

Gross

​

​

​

​

Amortized

​

unrealized

​

unrealized

​

​

​

​

​

cost

​

gains

​

losses

​

Fair value

U.S. Treasury securities

​

$

49,338

​

$

—

​

$

(1,004)

​

$

48,334

Mortgage-backed securities:

​

​

​

​

​

​

​

​

​

​

​

​

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

​

​

299,337

​

​

226

​

​

(34,552)

​

​

265,011

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

​

236,377

​

2

​

(45,396)

​

190,983

Total investment securities held-to-maturity

​

$

585,052

​

$

228

​

$

(80,952)

​

$

504,328

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

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 123 securities which were in an unrealized loss position at December 31, 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:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

December 31, 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

​

$

—

​

$

—

​

$

48,334

​

$

(1,004)

​

$

48,334

​

$

(1,004)

Mortgage-backed securities:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

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

​

​

14,689

​

​

(72)

​

​

217,467

​

​

(34,480)

​

​

232,156

​

​

(34,552)

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

​

​

2,289

​

​

(37)

​

​

187,021

​

​

(45,359)

​

​

189,310

​

​

(45,396)

Total

​

$

16,978

​

$

(109)

​

$

452,822

​

$

(80,843)

​

$

469,800

​

$

(80,952)

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

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)

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Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-9

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-3

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
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-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
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-Name Accounting Standards Codification
-Section 50
-Paragraph 3
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-3

Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
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-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-3

Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-3

Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (d)
-Publisher FASB
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+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 55
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479081/326-30-55-8

Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-6

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
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- Definition

Tabular disclosure of information about investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-5

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-5

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-5B

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-5

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (aaa)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-5

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
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