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Goodwill and Other Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Intangible Assets and Goodwill
Goodwill and other intangible assets are presented in the table below. As of September 30, 2020, we evaluated recent potential triggering events that might be indicators that our goodwill was impaired. The events include the economic disruption and uncertainty surrounding the COVID-19 pandemic and the circumstances surrounding recent volatility in the market price of crude oil. Based on our evaluation, we concluded that our goodwill was not more than likely impaired as of that date.
September 30,
2020		December 31,
2019
Goodwill$654,952 $654,952 
Other intangible assets:
Core deposits$1,465 $2,043 
Customer relationships306 438 
$1,771 $2,481 
Estimated Aggregate Future Amortization Expense for Intangible Assets
The estimated aggregate future amortization expense for intangible assets remaining as of September 30, 2020 is as follows:
Remainder of 2020$208 
2021697 
2022481 
2023282 
202487 
Thereafter16 
$1,771