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Securities (Tables)
 12 Months Ended
Dec. 31, 2024
Securities  
Schedule of amortized cost and fair value of investment securities held to maturity

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Gross

    

Gross

​

​

 

​

​

Amortized

​

Unrealized

​

Unrealized

​

Fair

 

(Dollars in thousands)

    

Cost

    

Gains

    

Losses

    

Value

 

December 31, 2024:

​

​

​

​

​

​

​

​

​

​

​

​

​

U.S. Government agencies

​

$

147,272

​

$

—

​

$

(23,498)

​

$

123,774

​

Residential mortgage-backed securities issued by U.S. government

​

​

​

​

​

​

​

​

​

​

​

​

​

agencies or sponsored enterprises

​

​

1,297,543

​

​

—

​

​

(241,204)

​

​

1,056,339

​

Residential collateralized mortgage-obligations issued by U.S. government

​

​

​

​

​

​

​

​

​

​

​

​

​

agencies or sponsored enterprises

​

​

411,721

​

​

—

​

​

(72,057)

​

​

339,664

​

Commercial mortgage-backed securities issued by U.S. government

​

​

​

​

​

​

​

​

​

​

​

​

​

agencies or sponsored enterprises

​

​

348,338

​

​

—

​

​

(72,391)

​

​

275,947

​

Small Business Administration loan-backed securities

​

​

49,796

​

​

—

​

​

(10,993)

​

​

38,803

​

​

​

$

2,254,670

​

$

—

​

$

(420,143)

​

$

1,834,527

​

December 31, 2023:

​

​

​

​

​

​

​

​

​

​

​

​

​

U.S. Government agencies

​

$

197,267

​

$

—

​

$

(24,607)

​

$

172,660

​

Residential mortgage-backed securities issued by U.S. government

​

​

​

​

​

​

​

​

​

​

​

​

​

agencies or sponsored enterprises

​

​

1,438,102

​

​

—

​

​

(227,312)

​

​

1,210,790

​

Residential collateralized mortgage-obligations issued by U.S. government

​

​

​

​

​

​

​

​

​

​

​

​

​

agencies or sponsored enterprises

​

​

444,883

​

​

—

​

​

(68,139)

​

​

376,744

​

Commercial mortgage-backed securities issued by U.S. government

​

​

​

​

​

​

​

​

​

​

​

​

​

agencies or sponsored enterprises

​

​

354,055

​

​

—

​

​

(71,327)

​

​

282,728

​

Small Business Administration loan-backed securities

​

​

53,133

​

​

—

​

​

(11,319)

​

​

41,814

​

​

​

$

2,487,440

​

$

—

​

$

(402,704)

​

$

2,084,736

​
Schedule of amortized cost and fair value of investment securities available for sale

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Gross

​

Gross

​

​

​

​

​

​

Amortized

​

Unrealized

​

Unrealized

​

Fair

 

(Dollars in thousands)

    

Cost

    

Gains

    

Losses

    

Value

 

December 31, 2024:

​

​

​

​

​

​

​

​

​

​

​

​

​

U.S. Treasuries

​

$

10,654

​

$

2

​

$

—

​

$

10,656

​

U.S. Government agencies

​

​

169,207

​

​

—

​

​

(18,789)

​

​

150,418

​

Residential mortgage-backed securities issued by U.S. government

​

​

​

​

​

​

​

​

​

​

​

​

​

agencies or sponsored enterprises

​

 

1,659,851

​

 

97

​

 

(282,423)

​

 

1,377,525

​

Residential collateralized mortgage-obligations issued by U.S. government

​

​

​

​

​

​

​

​

​

​

​

​

​

agencies or sponsored enterprises

​

​

557,288

​

​

19

​

​

(98,212)

​

​

459,095

​

Commercial mortgage-backed securities issued by U.S. government

​

​

​

​

​

​

​

​

​

​

​

​

​

agencies or sponsored enterprises

​

​

1,234,573

​

​

562

​

​

(194,580)

​

​

1,040,555

​

State and municipal obligations

​

 

1,117,330

​

 

2

​

 

(171,609)

​

 

945,723

​

Small Business Administration loan-backed securities

​

 

351,814

​

 

19

​

 

(41,721)

​

 

310,112

​

Corporate securities

​

​

28,499

​

​

—

​

​

(1,990)

​

​

26,509

​

​

​

$

5,129,216

​

$

701

​

$

(809,324)

​

$

4,320,593

​

December 31, 2023:

​

​

​

​

​

​

​

​

​

​

​

​

​

U.S. Treasuries

​

$

74,720

​

$

—

​

$

(830)

​

$

73,890

​

U.S. Government agencies

​

​

246,089

​

​

—

​

​

(21,383)

​

​

224,706

​

Residential mortgage-backed securities issued by U.S. government

​

 

​

​

​

​

​

​

​

​

​

​

​

agencies or sponsored enterprises

​

​

1,822,104

​

 

294

​

 

(264,092)

​

 

1,558,306

​

Residential collateralized mortgage-obligations issued by U.S. government

​

​

​

​

​

​

​

​

​

​

​

​

​

agencies or sponsored enterprises

​

​

626,735

​

​

—

​

​

(99,313)

​

​

527,422

​

Commercial mortgage-backed securities issued by U.S. government

​

​

​

​

​

​

​

​

​

​

​

​

​

agencies or sponsored enterprises

​

​

1,217,125

​

​

1,516

​

​

(194,471)

​

​

1,024,170

​

State and municipal obligations

​

​

1,129,750

​

 

2

​

 

(152,291)

​

 

977,461

​

Small Business Administration loan-backed securities

​

 

413,950

​

 

86

​

 

(42,350)

​

 

371,686

​

Corporate securities

​

 

30,533

​

​

—

​

​

(3,786)

​

​

26,747

​

​

​

$

5,561,006

​

$

1,898

​

$

(778,516)

​

$

4,784,388

​
Schedule of amortized cost and carrying value of other investment securities

​

​

​

​

​

​

​

​

Carrying

 

(Dollars in thousands)

    

Value

 

December 31, 2024:

​

​

​

​

Federal Home Loan Bank stock

​

$

18,087

​

Federal Reserve Bank stock

​

​

150,261

​

Investment in unconsolidated subsidiaries

​

 

3,563

​

Other investment securities

​

 

51,702

​

​

​

$

223,613

​

December 31, 2023:

​

​

​

​

Federal Home Loan Bank stock

​

$

22,836

​

Federal Reserve Bank stock

​

​

150,261

​

Investment in unconsolidated subsidiaries

​

 

3,563

​

Other investment securities

​

 

15,383

​

​

​

$

192,043

​
Schedule of amortized cost and fair value of debt and equity securities by contractual maturity

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Securities

​

Securities

 

​

​

Held to Maturity

​

Available for Sale

 

​

​

Amortized

​

Fair

​

Amortized

​

Fair

 

(Dollars in thousands)

    

Cost

    

Value

    

Cost

    

Value

 

Due in one year or less

    

$

14,365

​

$

14,296

    

$

86,024

    

$

85,664

​

Due after one year through five years

​

 

36,431

​

 

33,221

​

 

330,052

​

 

311,492

​

Due after five years through ten years

​

 

433,740

​

 

371,741

​

 

1,237,398

​

 

1,063,353

​

Due after ten years

​

 

1,770,134

​

 

1,415,269

​

 

3,475,742

​

 

2,860,084

​

​

​

$

2,254,670

​

$

1,834,527

​

$

5,129,216

​

$

4,320,593

​
Schedule of information with respect to sales of available-for-sale securities

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Year Ended December 31,

​

(Dollars in thousands)

    

2024

    

2023

    

2022

 

Securities Available for Sale:

​

​

​

​

​

​

​

​

​

​

Sale proceeds

   

$

1,950

    

$

129,614

    

$

482,028

​

Gross realized gains

​

​

—

​

​

1,335

​

​

103

​

Gross realized losses

​

 

(50)

​

 

(1,292)

​

 

(73)

​

Net realized (loss) gain

​

$

(50)

​

$

43

​

$

30

​
Schedule of securities with gross unrealized losses, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Less Than

​

Twelve Months

 

​

​

Twelve Months

​

or More

 

​

​

Gross Unrealized

​

Fair

​

Gross Unrealized

​

Fair

 

(Dollars in thousands)

    

Losses

    

Value

    

Losses

    

Value

 

December 31, 2024:

​

​

​

​

​

​

​

​

​

​

​

​

​

Securities Held to Maturity

​

​

​

​

​

​

​

​

​

​

​

​

​

U.S. Government agencies

​

$

—

​

$

—

​

$

23,498

​

$

123,774

​

Residential mortgage-backed securities issued by U.S. government

​

​

​

​

​

​

​

​

​

​

​

​

​

agencies or sponsored enterprises

​

​

—

​

​

—

​

​

241,204

​

​

1,056,339

​

Residential collateralized mortgage-obligations issued by U.S. government

​

​

​

​

​

​

​

​

​

​

​

​

​

agencies or sponsored enterprises

​

​

—

​

 

—

​

 

72,057

​

 

339,664

​

Commercial mortgage-backed securities issued by U.S. government

​

​

​

​

​

​

​

​

​

​

​

​

​

agencies or sponsored enterprises

​

​

—

​

​

—

​

​

72,391

​

​

275,947

​

Small Business Administration loan-backed securities

​

​

—

​

​

—

​

​

10,993

​

​

38,803

​

​

​

$

—

​

$

—

​

$

420,143

​

$

1,834,527

​

Securities Available for Sale

​

​

​

​

​

​

​

​

​

​

​

​

​

U.S. Treasuries (1)

​

$

—

​

$

—

​

$

—

​

$

—

​

U.S. Government agencies

​

​

—

​

​

—

​

​

18,789

​

​

150,418

​

Residential mortgage-backed securities issued by U.S. government

​

​

​

​

​

​

​

​

​

​

​

​

​

agencies or sponsored enterprises

​

​

294

​

​

14,341

​

​

282,129

​

​

1,350,268

​

Residential collateralized mortgage-obligations issued by U.S. government

​

​

​

​

​

​

​

​

​

​

​

​

​

agencies or sponsored enterprises

​

​

—

​

 

—

​

 

98,212

​

 

454,908

​

Commercial mortgage-backed securities issued by U.S. government

​

​

​

​

​

​

​

​

​

​

​

​

​

agencies or sponsored enterprises

​

 

792

​

​

53,342

​

​

193,788

​

​

918,338

​

State and municipal obligations

​

 

1,484

​

​

19,400

​

​

170,125

​

​

923,431

​

Small Business Administration loan-backed securities

​

 

24

​

​

6,747

​

​

41,697

​

​

289,786

​

Corporate securities

​

​

—

​

​

—

​

​

1,990

​

​

26,509

​

​

​

$

2,594

​

$

93,830

​

$

806,730

​

$

4,113,658

​

December 31, 2023:

​

​

​

​

​

​

​

​

​

​

​

​

​

Securities Held to Maturity

​

​

​

​

​

​

​

​

​

​

​

​

​

U.S. Government agencies

​

$

—

​

$

—

​

$

24,607

​

$

172,660

​

Residential mortgage-backed securities issued by U.S. government

​

​

​

​

​

​

​

​

​

​

​

​

​

agencies or sponsored enterprises

​

​

—

​

​

—

​

​

227,312

​

​

1,210,790

​

Residential collateralized mortgage-obligations issued by U.S. government

​

​

​

​

​

​

​

​

​

​

​

​

​

agencies or sponsored enterprises

​

​

—

​

 

—

​

 

68,139

​

 

376,745

​

Commercial mortgage-backed securities issued by U.S. government

​

​

​

​

​

​

​

​

​

​

​

​

​

agencies or sponsored enterprises

​

​

—

​

​

—

​

​

71,327

​

​

282,728

​

Small Business Administration loan-backed securities

​

​

—

​

​

—

​

​

11,319

​

​

41,814

​

​

​

$

—

​

$

—

​

$

402,704

​

$

2,084,737

​

Securities Available for Sale

​

​

​

​

​

​

​

​

​

​

​

​

​

U.S. Treasuries

​

$

—

​

$

—

​

$

830

​

$

73,890

​

U.S. Government agencies

​

​

—

​

​

—

​

​

21,383

​

​

224,706

​

Residential mortgage-backed securities issued by U.S. government

​

​

​

​

​

​

​

​

​

​

​

​

​

agencies or sponsored enterprises

​

​

122

​

​

9,358

​

​

263,970

​

​

1,539,208

​

Residential collateralized mortgage-obligations issued by U.S. government

​

​

​

​

​

​

​

​

​

​

​

​

​

agencies or sponsored enterprises

​

​

—

​

 

—

​

 

99,313

​

 

527,422

​

Commercial mortgage-backed securities issued by U.S. government

​

​

​

​

​

​

​

​

​

​

​

​

​

agencies or sponsored enterprises

​

​

91

​

​

7,959

​

​

194,380

​

​

955,059

​

State and municipal obligations

​

​

177

​

​

6,340

​

​

152,114

​

​

967,305

​

Small Business Administration loan-backed securities

​

​

128

​

​

42,447

​

​

42,222

​

​

304,770

​

Corporate securities

​

 

18

​

​

480

​

​

3,768

​

​

26,267

​

​

​

$

536

​

$

66,584

​

$

777,980

​

$

4,618,627

​

(1)

The U.S. Treasury securities in a continuous unrealized losses position for less than twelve months at December 31, 2024, had a combined gross unrealized loss total of less than $1,000.
Schedule of trading securities

​

​

​

​

​

​

​

​

​

​

    

December 31,

​

December 31,

​

(Dollars in thousands)

    

2024

 

2023

​

U.S. Government agencies

​

$

15,002

​

$

1,537

​

Residential mortgage pass-through securities issued or guaranteed by U.S.

​

​

​

​

​

​

​

government agencies or sponsored enterprises

​

​

14,803

​

​

14,461

​

Commercial mortgage-backed securities issued by U.S. government

​

​

​

​

​

​

​

agencies or sponsored enterprises

​

​

14,419

​

​

—

​

State and municipal obligations

​

​

35,896

​

​

14,620

​

Small Business Administration loan-backed securities

​

​

22,571

​

​

—

​

Other debt securities

​

​

241

​

​

703

​

​

​

$

102,932

​

$

31,321

​
Summary of net gains (losses) on trading securities

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Year Ended

​

​

​

December 31,

​

(Dollars in thousands)

​

2024

​

2023

​

2022

​

Net gains (losses) on sales transaction

​

$

1,596

​

$

289

​

$

(1,326)

​

Net mark to mark (losses) gains

​

​

(583)

​

​

278

​

​

(237)

​

Net gains (losses) on trading securities

​

$

1,013

​

$

567

​

$

(1,563)

​

​