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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, 2021	Dec. 31, 2020
Amortizable intangible assets:
Gross Carrying Amount	$ 43,867	$ 47,432
Accumulated Amortization	33,694	32,066
Unamortizable intangible assets:
Goodwill	231,906	239,272
Customer lists
Amortizable intangible assets:
Gross Carrying Amount	2,700	7,613
Accumulated Amortization	1,263	2,814
Core deposit intangibles
Amortizable intangible assets:
Gross Carrying Amount	28,440	28,440
Accumulated Amortization	25,677	23,832
SBA servicing asset
Amortizable intangible assets:
Gross Carrying Amount	11,687	9,976
Accumulated Amortization	5,792	4,188
Other
Amortizable intangible assets:
Gross Carrying Amount	1,040	1,403
Accumulated Amortization	$ 962	$ 1,232

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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