Goodwill and Other Intangible Assets - Amortization (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Goodwill
Gross Carrying Amount	$ 43,346		$ 47,139
Accumulated Amortization	(18,578)		(21,220)
Total	24,768		25,919
Intangible amortization expense	1,151	$ 990
Goodwill, Impairment Loss	0
Identifiable customer intangibles
Goodwill
Gross Carrying Amount	43,346		43,346
Accumulated Amortization	(18,578)		(17,490)
Total	$ 24,768		25,856
Core deposit intangible assets
Goodwill
Gross Carrying Amount			3,793
Accumulated Amortization			(3,730)
Total			$ 63

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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

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

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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