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Goodwill and Other Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2021
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)2021202020212020
Balance at beginning of period$1,036,994 $1,036,994 $1,036,994 $1,036,994 
Acquisitions and adjustments— — — — 
Balance at end of period$1,036,994 $1,036,994 $1,036,994 $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, 2021   
Core deposit$92,754 $(57,684)$35,070 
Customer trust relationships16,547 (14,366)2,181 
Total intangible assets$109,301 $(72,050)$37,251 
December 31, 2020
Core deposit$112,723 $(69,623)$43,100 
Customer trust relationships16,547 (13,633)2,914 
Total intangible assets$129,270 $(83,256)$46,014 
Schedule of Estimated Amortization Expense for Future Years
Estimated amortization expense for future years is as follows:
(dollars in thousands) 
2021 remaining$2,573 
20229,014 
20237,053 
20245,645 
20254,509 
Thereafter8,457 
Total$37,251