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Goodwill and Other Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Changes in Carrying Amount of Goodwill
The following table presents the changes in the carrying amount of goodwill:
Three Months Ended
September 30,		Nine Months Ended
September 30,
(dollars in thousands)2023202220232022
Balance at beginning of period$1,998,716 $1,991,534 $1,998,716 $1,036,994 
Acquisitions and adjustments— 11,065 — 965,605 
Balance at end of period$1,998,716 $2,002,599 $1,998,716 $2,002,599 
Schedule of Gross Carrying Amounts and Accumulated Amortization of Other Intangible Assets
The gross carrying amounts and accumulated amortization of other intangible assets were as follows: 
(dollars in thousands)Gross
Carrying
Amount		Accumulated
Amortization
and Impairment		Net
Carrying
Amount
September 30, 2023   
Core deposit$143,511 $(68,312)$75,199 
Customer trust relationships52,621 (19,701)32,920 
Total other intangible assets$196,132 $(88,013)$108,119 
December 31, 2022
Core deposit$170,642 $(80,951)$89,691 
Customer trust relationships56,243 (19,529)36,714 
Total other intangible assets$226,885 $(100,480)$126,405 
Schedule of Estimated Amortization Expense for Future Years
Estimated amortization expense for future years is as follows:
(dollars in thousands) 
2023 remaining$5,869 
202421,239 
202518,358 
202615,555 
202712,867 
Thereafter34,231 
Total$108,119