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INVESTMENT SECURITIES (Tables)
3 Months Ended
Mar. 31, 2026
INVESTMENT SECURITIES  
Schedule of the amortized cost and approximate fair values of securities

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  ​ ​ ​

Gross

  ​ ​ ​

Gross

  ​ ​ ​

​

​

​

​

Amortized 

​

Unrealized

​

Unrealized

​

Fair 

March 31, 2026

​

Cost

​

Gains

​

Losses

​

Value

Available-for-sale securities:

 

​

  ​

 

​

  ​

 

​

  ​

 

​

  ​

Municipal securities

​

$

2,836,073

​

$

1,913

​

$

3,535

​

$

2,834,451

Collateralized mortgage obligation bonds

​

 

47,340

​

 

—

​

 

1,327

​

 

46,013

U.S. government agencies

​

 

1,497,851

​

 

—

​

 

68,954

​

 

1,428,897

Mortgage-backed securities

​

 

1,232,096

​

 

4,922

​

 

77,121

​

 

1,159,897

​

​

$

5,613,360

​

$

6,835

​

$

150,937

​

$

5,469,258

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​

​

​

​

​

​

​

​

​

​

​

​

​

​

  ​ ​ ​

​

​

  ​ ​ ​

Gross

  ​ ​ ​

Gross

  ​ ​ ​

​

​

​

​

Amortized 

​

Unrealized 

​

Unrealized

​

Fair 

December 31, 2025

​

Cost

​

Gains

​

Losses

​

Value

Available-for-sale securities:

 

​

  ​

 

​

  ​

 

​

  ​

 

​

  ​

Municipal securities

​

$

2,837,990

​

$

2,253

​

$

4,207

​

$

2,836,036

Collateralized mortgage obligation bonds

​

 

50,980

​

 

—

​

 

1,263

​

 

49,717

U.S. government agencies

​

 

1,497,747

​

 

—

​

 

59,911

​

 

1,437,836

Mortgage-backed securities

​

 

1,282,116

​

 

6,981

​

 

73,994

​

 

1,215,103

​

​

$

5,668,833

​

$

9,234

​

$

139,375

​

$

5,538,692

Schedule of the amortized cost and fair value of securities by contractual maturity

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​

​

​

​

​

March 31, 2026

​

​

Available-for-sale

​

​

Amortized

​

Fair 

​

​

Cost

​

Value

Municipal securities and U.S. government agencies

  ​ ​ ​

​

  ​

  ​ ​ ​

​

  ​

Due less than one year

​

$

310,000

​

$

310,081

Due one to five years

​

 

1,497,851

​

 

1,428,897

Due five to ten years

​

 

1,995,000

​

 

1,996,832

Due after ten years

​

 

531,073

​

 

527,538

Total

​

$

4,333,924

​

$

4,263,348

​

​

​

​

​

​

​

Mortgage-backed securities and collateralized mortgage obligation bonds

​

 

1,279,436

​

 

1,205,910

Total

​

$

5,613,360

​

$

5,469,258

Schedule of gross unrealized losses and fair value of investments in continuous loss position

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​

Less than 12 Months

​

12 Months or Longer

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Total

​

​

Fair

​

Unrealized

​

Fair 

​

Unrealized

​

Fair

​

Unrealized

​

​

Value

​

Losses

​

Value

​

Losses

​

Value

​

Losses

March 31, 2026

  ​ ​ ​

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  ​

  ​ ​ ​

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  ​

  ​ ​ ​

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  ​

  ​ ​ ​

​

  ​

  ​ ​ ​

​

  ​

  ​ ​ ​

​

  ​

Municipal securities

​

$

—

​

$

—

​

$

527,538

​

$

3,535

​

$

527,538

​

$

3,535

Collateralized mortgage obligation bonds

​

 

—

​

 

—

​

 

46,013

​

 

1,327

​

 

46,013

​

 

1,327

U.S. government agencies

​

 

—

​

 

—

​

 

1,428,897

​

 

68,954

​

 

1,428,897

​

 

68,954

Mortgage-backed securities

​

 

—

​

 

—

​

 

774,171

​

 

77,121

​

 

774,171

​

 

77,121

Total

​

$

—

​

$

—

​

$

2,776,619

​

$

150,937

​

$

2,776,619

​

$

150,937

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Less than 12 Months

​

12 Months or Longer

​

Total

​

​

Fair

​

Unrealized

​

Fair

​

Unrealized

​

Fair

​

Unrealized

​

​

Value

​

Losses

​

Value

​

Losses

​

Value

​

Losses

December 31, 2025

  ​ ​ ​

​

  ​

  ​ ​ ​

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  ​

  ​ ​ ​

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  ​

  ​ ​ ​

​

  ​

  ​ ​ ​

​

  ​

  ​ ​ ​

​

  ​

Municipal securities

​

$

—

​

$

—

​

$

528,782

​

$

4,207

​

$

528,782

​

$

4,207

Collateralized mortgage obligation bonds

​

 

—

​

 

—

​

 

49,717

​

 

1,263

​

 

49,717

​

 

1,263

U.S. government agencies

​

 

—

​

 

—

​

 

1,437,836

​

 

59,911

​

 

1,437,836

​

 

59,911

Mortgage-backed securities

​

 

—

​

 

—

​

 

825,648

​

 

73,994

​

 

825,648

​

 

73,994

Total

​

$

—

​

$

—

​

$

2,841,983

​

$

139,375

​

$

2,841,983

​

$

139,375

Schedule of number and aggregate depreciation of available-for-sale securities in a continuous unrealized loss position by security type

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  ​ ​ ​

Number of

  ​ ​ ​

​

 

​

​

securities in

​

Aggregate

 

​

​

a loss position

​

Depreciation

 

March 31, 2026

 

  ​

 

  ​

​

Municipal securities

 

1

 

(0.67)

%

Collateralized mortgage obligation bonds

 

1

 

(2.80)

%

U.S. government agencies

 

2

 

(4.60)

%

Mortgage-backed securities

 

8

 

(9.06)

%

Total Portfolio

 

12

 

(5.16)

%

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​

​

​

​

  ​ ​ ​

Number of

  ​ ​ ​

​

 

​

​

securities in

​

Aggregate

 

​

​

a loss position

​

Depreciation

 

December 31, 2025

 

  ​

 

  ​

​

Municipal securities

 

1

 

(0.79)

%

Collateralized mortgage obligation bonds

 

1

 

(2.48)

%

U.S. government agencies

 

2

 

(4.00)

%

Mortgage-backed securities

 

8

 

(8.22)

%

Total Portfolio

 

12

 

(4.67)

%