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Goodwill and Other Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary Of Gross Goodwill And Accumulated Impairment Losses And Write-Offs Detailed By Reportable Segments
The following is a summary of goodwill by reportable segment included in the Consolidated Balance Sheets as of September 30, 2020 and December 31, 2019.
(Dollars in thousands)Regional
Banking		Fixed
Income		Total
December 31, 2018$1,289,819 $142,968 $1,432,787 
Additions— — — 
September 30, 2019$1,289,819 $142,968 $1,432,787 
December 31, 2019$1,289,819 $142,968 $1,432,787 
Additions77,644 — 77,644 
September 30, 2020$1,367,463 $142,968 $1,510,431 
Summary Of Intangible Assets and Accumulated Amortization Included In The Consolidated Statements of Condition The following table, which excludes fully amortized intangibles, presents other intangible assets included in the Consolidated Balance Sheets:
 
 September 30, 2020December 31, 2019
(Dollars in thousands)Gross Carrying
Amount		Accumulated
Amortization		Net Carrying
Value		Gross Carrying
Amount		Accumulated
Amortization		Net Carrying
Value
Core deposit intangibles$370,850 $(68,902)$301,948 $157,150 $(47,372)$109,778 
Customer relationships37,000 (7,037)29,963 77,865 (60,150)17,715 
Other (a)38,685 (4,896)33,789 5,622 (2,915)2,707 
Total$446,535 $(80,835)$365,700 $240,637 $(110,437)$130,200 
(a)Includes noncompete covenants, purchased credit card intangible assets, and state banking licenses not subject to amortization.
Schedule of Estimated Aggregate Amortization Expense for Intangible Assets As of September 30, 2020 the estimated aggregated amortization expense is expected to be:
(Dollars in thousands)
YearAmortization
Remainder of 2020$14,921 
202155,943 
202251,498 
202347,859 
202444,040 
202537,145