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Goodwill and Other Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2022
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)2022202120222021
Balance at beginning of period$1,991,534 $1,036,994 $1,036,994 $1,036,994 
Acquisitions and adjustments11,065 — 965,605 — 
Balance at end of period$2,002,599 $1,036,994 $2,002,599 $1,036,994 
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, 2022   
Core deposit$170,642 $(75,531)$95,111 
Customer trust relationships56,243 (18,161)38,082 
Total intangible assets$226,885 $(93,692)$133,193 
December 31, 2021
Core deposit$92,754 $(60,036)$32,718 
Customer trust relationships16,547 (14,587)1,960 
Total intangible assets$109,301 $(74,623)$34,678 
Schedule of Estimated Amortization Expense for Future Years
Estimated amortization expense for future years is as follows:
(dollars in thousands) 
2022 remaining$6,788 
202324,214 
202421,298 
202518,417 
202615,614 
Thereafter46,862 
Total$133,193