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Goodwill and Other Intangible Assets (Summary of the Gross Carrying Amount and Accumulated Amortization of Intangible Assets) (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Amortizable intangible assets:    
Gross Carrying Amount $ 59,590 $ 60,690
Accumulated Amortization 35,124 31,183
Total 24,466 29,507
Unamortizable intangible assets:    
Goodwill 478,750 478,750
Intangible Assets Excluding Servicing Assets    
Amortizable intangible assets:    
Total 24,466  
Customer lists    
Amortizable intangible assets:    
Gross Carrying Amount 1,600 2,700
Accumulated Amortization 1,307 2,167
Total 293 533
Core deposit intangibles    
Amortizable intangible assets:    
Gross Carrying Amount 57,890 57,890
Accumulated Amortization 33,717 28,933
Total 24,173 28,957
Other intangibles    
Amortizable intangible assets:    
Gross Carrying Amount 100 100
Accumulated Amortization 100 83
Total $ 0 $ 17