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Intangible Assets
 12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Intangible Assets
Intangible assets at December 31, 2020 and 2019 are summarized as follows (in thousands):
20202019
Goodwill$443,001 420,562 
Core deposit premiums1,112 1,753 
Customer relationship and other intangibles21,466 14,142 
Mortgage servicing rights633 562 
Total intangible assets$466,212 437,019 
Amortization expense of intangible assets for the years ended December 31, 2020, 2019 and 2018 is as follows (in thousands):
202020192018
Core deposit premiums$824 786 931 
Customer relationship and other intangibles2,457 1,869 1,073 
Mortgage servicing rights144 85 123 
Total amortization expense of intangible assets$3,425 2,740 2,127 
Scheduled amortization of core deposit premiums and customer relationship and other intangibles for each of the next five years is as follows (in thousands): 
Year ended December 31,Scheduled Amortization
2021$3,513 
20223,143 
20232,771 
20242,432 
20252,206