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Investment Securities (Tables)

6 Months Ended

Jun. 30, 2023

Investment Securities

Available-for-sale Securities

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

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

June 30, 2023

​

Amortized

Gross

Gross

​

​

​

​

cost

​

unrealized gains

​

unrealized losses

​

Fair value

U.S. Treasury securities

​

$

74,265

​

$

—

​

$

(2,690)

​

$

71,575

Mortgage-backed securities:

​

​

​

​

​

​

​

​

​

​

​

​

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

​

​

248,129

​

​

3

​

​

(36,927)

​

​

211,205

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

​

446,901

​

—

​

(73,121)

​

373,780

Municipal securities

​

​

155

​

​

—

​

​

(2)

​

​

153

Corporate debt

​

​

2,000

​

​

—

​

​

(159)

​

​

1,841

Other securities

​

793

​

—

​

—

​

793

Total investment securities available-for-sale

​

$

772,243

​

$

3

​

$

(112,899)

​

$

659,347

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

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:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

June 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

​

$

—

​

$

—

​

$

71,575

​

$

(2,690)

​

$

71,575

​

$

(2,690)

Mortgage-backed securities:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

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

​

​

14,762

​

​

(721)

​

​

195,368

​

​

(36,206)

​

​

210,130

​

​

(36,927)

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

​

​

671

​

​

(27)

​

​

373,109

​

​

(73,094)

​

​

373,780

​

​

(73,121)

Municipal securities

​

​

153

​

​

(2)

​

​

—

​

​

—

​

​

153

​

​

(2)

Corporate debt

​

​

1,841

​

​

(159)

​

​

—

​

​

—

​

​

1,841

​

​

(159)

Total

​

$

17,427

​

$

(909)

​

$

640,052

​

$

(111,990)

​

$

657,479

​

$

(112,899)

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

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)

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 June 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.

​

​	​	​	​	​	​	​	​	​
​	​	June 30, 2023
​	​	​	​	​	​	​	​	Weighted
​	​	Amortized Cost		​	Fair Value		​	Average Yield
U.S. Treasury securities	​	​	​	​	​	​	​	​
Within one year	​	$	24,867	​	$	24,360	​	2.29%
After one but within five years	​	​	49,398	​	​	47,215	​	2.67%
Municipal securities	​	​	​	​	​	​	​	​
After one but within five years	​	​	155	​	​	153	​	3.17%
Corporate debt	​	​	​	​	​	​	​	​
After five but within ten years	​	​	2,000	​	​	1,841	​	5.87%

A summary of the held-to-maturity securities by maturity is shown in the following table as of June 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.

​

​	​	​	​	​	​	​	​	​
​	​	June 30, 2023
​	​	​	​	​	​	​	​	Weighted
​	​	Amortized Cost		​	Fair Value		​	Average Yield
U.S. Treasury securities	​	​	​	​	​	​	​	​
After one but within five years	​	$	49,189	​	$	47,444	​	3.14%

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:

​

​	​	​	​	​	​	​	​	​	​
​	​	June 30, 2023
​	​	AAA		​	Not rated		​	Total
U.S. Treasury securities	​	$	71,575	​	$	—	​	$	71,575
Mortgage-backed securities:	​	​	​	​	​	​	​	​	​
Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises	​	​	211,205	​	​	—	​	​	211,205
Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises	​	​	373,780	​	​	—	​	​	373,780
Municipal securities	​	​	—	​	​	153	​	​	153
Corporate debt	​	​	—	​	​	1,841	​	​	1,841
Other securities	​		—	​		793	​		793
Total investment securities available-for-sale	​	$	656,560	​	$	2,787	​	$	659,347

​

​	​	​	​	​	​	​	​	​	​
​	​	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

Held-to-maturity Securities

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

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

June 30, 2023

​

​

​

Gross

Gross

​

​

​

​

Amortized

​

unrealized

​

unrealized

​

​

​

​

​

cost

​

gains

​

losses

​

Fair value

U.S. Treasury securities

​

$

49,189

​

$

—

​

$

(1,745)

​

$

47,444

Mortgage-backed securities:

​

​

​

​

​

​

​

​

​

​

​

​

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

​

​

320,623

​

​

29

​

​

(40,035)

​

​

280,617

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

​

249,588

​

—

​

(50,059)

​

199,529

Total investment securities held-to-maturity

​

$

619,400

​

$

29

​

$

(91,839)

​

$

527,590

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

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 155 securities, which were in an unrealized loss position as of June 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:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

June 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

​

$

47,444

​

$

(1,745)

​

$

—

​

$

—

​

$

47,444

​

$

(1,745)

Mortgage-backed securities:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

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

​

​

69,272

​

​

(1,554)

​

​

206,822

​

​

(38,481)

​

​

276,094

​

​

(40,035)

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

​

​

25,926

​

​

(1,034)

​

​

173,603

​

​

(49,025)

​

​

199,529

​

​

(50,059)

Total

​

$

142,642

​

$

(4,333)

​

$

380,425

​

$

(87,506)

​

$

523,067

​

$

(91,839)

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

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:

​

​	​	​	​
​	​	June 30, 2023
​	​	AAA
U.S. Treasury securities	​	$	49,189
Mortgage-backed securities:	​	​	​
Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises	​	​	320,623
Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises	​		249,588
Total investment securities held-to-maturity	​	$	619,400

​

​	​	​	​
​	​	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

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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
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Reference 2: 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//1943274/2147481800/320-10-50-3

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-Topic 320
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-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

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-Name Accounting Standards Codification
-Section 50
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-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
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-Section 50
-Paragraph 2
-Subparagraph (aa)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

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

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-Name Accounting Standards Codification
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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
-Topic 320
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-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-3

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-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-3

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
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-3

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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

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-Name Accounting Standards Codification
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-Topic 326
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-Section 50
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Tabular disclosure of credit quality indicator for investment in debt security measured at amortized cost (held-to-maturity).

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

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No definition available.

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