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Goodwill and Other Intangible Assets (Tables)
3 Months Ended
Mar. 31, 2026
Goodwill and Other Intangible Assets  
Summary of gross carrying amounts and accumulated amortization of other intangible assets

March 31,

December 31,

(Dollars in thousands)

  ​ ​ ​

2026

  ​ ​ ​

2025

  ​ ​ ​

Gross carrying amount

$

689,084

$

689,419

Accumulated amortization

 

(324,398)

 

(303,093)

$

364,686

$

386,326

Schedule of estimated amortization expense for other intangibles for each of the next five quarters and thereafter

(Dollars in thousands)

Quarter ending:

  ​ ​ ​

  ​ ​ ​

 

June 30, 2026

$

21,041

September 30, 2026

 

20,628

December 31, 2026

 

20,628

March 31, 2027

 

18,517

June 30, 2027

18,188

Thereafter

 

260,508

$

359,510