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Investment Securities
6 Months Ended
Jun. 30, 2025
Investment Securities  
Investment Securities

2. Investment Securities

As of June 30, 2025 and December 31, 2024, investment securities consisted predominantly of the following investment categories:

Debt securities – includes debt securities issued by U.S. government agencies.

Mortgage-backed securities – includes securities backed by notes or receivables secured by mortgage assets with cash flows based on actual or scheduled payments.

Collateralized mortgage obligations – includes securities backed by a pool of mortgages with cash flows distributed based on certain rules rather than pass through payments.

Collateralized loan obligations – includes structured debt securities backed by a pool of loans, consisting of primarily non-investment grade broadly syndicated corporate loans with additional credit enhancement. These are floating rate securities that have an investment grade rating of AA or better.

Debt securities issued by states and political subdivisions – includes general obligation bonds issued by state and local governments.

As of June 30, 2025 and December 31, 2024, the Company’s investment securities were classified as either available-for-sale or held-to-maturity. Amortized cost, gross unrealized holding gains and losses and fair value of available-for-sale and held-to-maturity investment securities as of June 30, 2025 and December 31, 2024 were as follows:

June 30, 2025

December 31, 2024

Amortized

Unrealized

Unrealized

Fair

Amortized

Unrealized

Unrealized

Fair

(dollars in thousands)

  

Cost

  

Gains

  

Losses

  

Value

  

Cost

  

Gains

  

Losses

  

Value

Government agency debt securities

$

$

$

$

$

8,170

$

$

(23)

$

8,147

Mortgage-backed securities:

Residential - Government agency

35,295

286

(1,209)

34,372

37,473

(1,614)

35,859

Residential - Government-sponsored enterprises

786,643

348

(72,653)

714,338

840,836

(102,723)

738,113

Commercial - Government agency

243,434

(49,424)

194,010

249,348

(53,223)

196,125

Commercial - Government-sponsored enterprises

45,844

(1,931)

43,913

48,015

(3,107)

44,908

Commercial - Non-agency

88,812

504

89,316

22,000

83

22,083

Collateralized mortgage obligations:

Government agency

426,641

119

(42,773)

383,987

452,038

(54,914)

397,124

Government-sponsored enterprises

338,441

395

(40,184)

298,652

359,416

(48,734)

310,682

Collateralized loan obligations

132,796

270

133,066

173,152

323

173,475

Total available-for-sale securities

$

2,097,906

$

1,922

$

(208,174)

$

1,891,654

$

2,190,448

$

406

$

(264,338)

$

1,926,516

Government agency debt securities

$

47,692

$

$

(3,837)

$

43,855

$

49,267

$

$

(5,398)

$

43,869

Mortgage-backed securities:

Residential - Government agency

39,037

(5,310)

33,727

40,888

(6,579)

34,309

Residential - Government-sponsored enterprises

89,907

(12,880)

77,027

92,573

(14,854)

77,719

Commercial - Government agency

30,779

(8,140)

22,639

31,009

(8,666)

22,343

Commercial - Government-sponsored enterprises

1,100,422

217

(124,704)

975,935

1,114,549

201

(149,244)

965,506

Collateralized mortgage obligations:

Government agency

863,939

(100,312)

763,627

907,565

(126,020)

781,545

Government-sponsored enterprises

1,432,249

(168,283)

1,263,966

1,500,212

(210,721)

1,289,491

Debt securities issued by states and political subdivisions

54,789

(4,867)

49,922

54,587

(6,860)

47,727

Total held-to-maturity securities

$

3,658,814

$

217

$

(428,333)

$

3,230,698

$

3,790,650

$

201

$

(528,342)

$

3,262,509

Accrued interest receivable related to available-for-sale investment securities was $5.0 million and $5.6 million as of June 30, 2025 and December 31, 2024, respectively. Accrued interest receivable related to held-to-maturity investment securities was $6.3 million and $6.6 million as of June 30, 2025 and December 31, 2024, respectively. Accrued interest receivable is recorded separately from the amortized cost basis of investment securities on the Company’s unaudited interim consolidated balance sheets.

Proceeds from calls and sales of investment securities were $0.5 million and nil, respectively, for the three months ended June 30, 2025, and $40.6 million and nil, respectively, for the six months ended June 30, 2025. Proceeds from calls and sales of investment securities were $23.4 million and nil, respectively, for the three months ended June 30, 2024 and $33.8 million and nil, respectively, for the six months ended June 30, 2024. The Company recorded gross realized gains of nil and gross realized losses of nil for the three and six months ended June 30, 2025 and 2024. The income tax expense related to the Company’s net realized gain on the sale of investment securities was nil for the three and six months ended June 30, 2025 and 2024. Gains and losses realized on sales of securities are determined using the specific identification method.

Interest income from taxable investment securities was $25.7 million and $28.5 million, respectively, for the three months ended June 30, 2025 and 2024, and $52.4 million and $57.7 million, respectively, for the six months ended June 30, 2025 and 2024. Interest income from non-taxable investment securities was $3.1 million and $3.2 million, respectively, for the three months ended June 30, 2025 and 2024, and $6.2 million and $6.4 million, respectively, for the six months ended June 30, 2025 and 2024.

The amortized cost and fair value of debt securities issued by government agencies and states and political subdivisions, non-agency mortgage-backed securities and collateralized loan obligations as of June 30, 2025, by contractual maturity, are shown below. Mortgage-backed securities and collateralized mortgage obligations issued by government agencies and government-sponsored enterprises are disclosed separately in the table below as remaining expected maturities will differ from contractual maturities as borrowers have the right to prepay obligations.

June 30, 2025

Amortized

Fair

(dollars in thousands)

  

Cost

  

Value

Available-for-sale securities

Due in one year or less

$

$

Due after one year through five years

80,853

81,325

Due after five years through ten years

126,755

127,022

Due after ten years

14,000

14,035

221,608

222,382

Mortgage-backed securities:

Residential - Government agency

35,295

34,372

Residential - Government-sponsored enterprises

786,643

714,338

Commercial - Government agency

243,434

194,010

Commercial - Government-sponsored enterprises

45,844

43,913

Total mortgage-backed securities

1,111,216

986,633

Collateralized mortgage obligations:

Government agency

426,641

383,987

Government-sponsored enterprises

338,441

298,652

Total collateralized mortgage obligations

765,082

682,639

Total available-for-sale securities

$

2,097,906

$

1,891,654

Held-to-maturity securities

Due in one year or less

$

$

Due after one year through five years

Due after five years through ten years

51,856

48,536

Due after ten years

50,625

45,241

102,481

93,777

Mortgage-backed securities:

Residential - Government agency

39,037

33,727

Residential - Government-sponsored enterprises

89,907

77,027

Commercial - Government agency

30,779

22,639

Commercial - Government-sponsored enterprises

1,100,422

975,935

Total mortgage-backed securities

1,260,145

1,109,328

Collateralized mortgage obligations:

Government agency

863,939

763,627

Government-sponsored enterprises

1,432,249

1,263,966

Total collateralized mortgage obligations

2,296,188

2,027,593

Total held-to-maturity securities

$

3,658,814

$

3,230,698

At June 30, 2025, pledged securities totaled $4.2 billion, of which $2.4 billion was pledged to secure borrowing capacity, $1.7 billion was pledged to secure public deposits and $50.7 million was pledged to secure other financial transactions. At December 31, 2024, pledged securities totaled $3.8 billion, of which $2.1 billion was pledged to secure borrowing capacity, $1.7 billion was pledged to secure public deposits and $19.3 million was pledged to secure other financial transactions.

The Company held no securities of any single issuer, other than debt securities issued by government agencies and government-sponsored enterprises, which were in excess of 10% of stockholders’ equity as of June 30, 2025 and December 31, 2024.

The following tables present the unrealized gross losses and fair values of securities in the available-for-sale portfolio by length of time that the 144 and 159 individual securities in each category have been in a continuous loss position as of June 30, 2025 and December 31, 2024, respectively. The unrealized losses on available-for-sale investment securities were attributable to changes in interest rates, relative to when the investment securities were purchased, and not due to the credit quality of the investment securities.

Time in Continuous Loss as of June 30, 2025

Less Than 12 Months

12 Months or More

Total

Unrealized

Unrealized

Unrealized

(dollars in thousands)

  

Losses

  

Fair Value

  

Losses

  

Fair Value

  

Losses

  

Fair Value

Mortgage-backed securities:

Residential - Government agency

$

$

$

(1,209)

$

8,540

$

(1,209)

$

8,540

Residential - Government-sponsored enterprises

(119)

82,667

(72,534)

594,518

(72,653)

677,185

Commercial - Government agency

(49,424)

194,010

(49,424)

194,010

Commercial - Government-sponsored enterprises

(1,931)

43,913

(1,931)

43,913

Collateralized mortgage obligations:

Government agency

(123)

46,917

(42,650)

300,687

(42,773)

347,604

Government-sponsored enterprises

(40,184)

243,192

(40,184)

243,192

Total available-for-sale securities with unrealized losses

$

(242)

$

129,584

$

(207,932)

$

1,384,860

$

(208,174)

$

1,514,444

Time in Continuous Loss as of December 31, 2024

Less Than 12 Months

12 Months or More

Total

Unrealized

Unrealized

Unrealized

(dollars in thousands)

  

Losses

  

Fair Value

  

Losses

  

Fair Value

  

Losses

  

Fair Value

Government agency debt securities

$

$

$

(23)

$

8,147

$

(23)

$

8,147

Mortgage-backed securities:

Residential - Government agency

(154)

27,127

(1,460)

8,732

(1,614)

35,859

Residential - Government-sponsored enterprises

(2,997)

116,084

(99,726)

622,029

(102,723)

738,113

Commercial - Government agency

(53,223)

196,125

(53,223)

196,125

Commercial - Government-sponsored enterprises

(3,107)

44,908

(3,107)

44,908

Collateralized mortgage obligations:

Government agency

(712)

76,968

(54,202)

310,171

(54,914)

387,139

Government-sponsored enterprises

(912)

57,509

(47,822)

253,173

(48,734)

310,682

Total available-for-sale securities with unrealized losses

$

(4,775)

$

277,688

$

(259,563)

$

1,443,285

$

(264,338)

$

1,720,973

At June 30, 2025 and December 31, 2024, the Company did not have any available-for-sale securities with the intent to sell and determined it was more likely than not that the Company would not be required to sell the securities prior to recovery of the amortized cost basis. As the Company had the intent and ability to hold the remaining available-for-sale securities in an unrealized loss position as of June 30, 2025 and December 31, 2024, each security with an unrealized loss position in the above tables has been further assessed to determine if a credit loss exists. As of June 30, 2025 and December 31, 2024, the Company did not expect any credit losses in its available-for-sale debt securities and no credit losses were recognized on available-for-sale securities during the three and six months ended June 30, 2025 and for the year ended December 31, 2024.

As of June 30, 2025 and December 31, 2024, the Company’s investment securities were comprised primarily of debt securities, mortgage-backed securities and collateralized mortgage obligations issued by U.S. government agencies and government-sponsored enterprises, with under 5% of the investment securities comprised of collateralized loan obligations rated AA or better, obligations issued by local state and political subdivisions rated AA or better and non-agency commercial mortgage-backed securities rated AAA. For investment securities issued by the U.S. Government, its agencies and government-sponsored enterprises, management has concluded that the long history with no credit losses from these issuers indicates an expectation that nonpayment of the amortized cost basis is zero, and these securities are explicitly or implicitly fully guaranteed by the U.S. government. The U.S. government can print its own currency and its currency is routinely held by central banks and other major financial institutions. The dollar is used in international commerce, and commonly is viewed as a reserve currency, all of which qualitatively indicates that historical credit loss information should be minimally affected by current conditions and reasonable and supportable forecasts. For collateralized loan obligations, debt securities issued by local state and political subdivisions and non-agency commercial mortgage-backed securities, these securities are investment grade and highly rated and carry either sufficient credit enhancement or days cash on hand to support timely payments of principal and interest. As a result, the Company does not expect any future payment defaults and has not recorded an allowance for credit losses for its available-for-sale and held-to-maturity debt securities as of June 30, 2025 or December 31, 2024.