Goodwill and Other Intangible Assets - Amortization (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Goodwill
Gross Carrying Amount	$ 35,650		$ 35,650		$ 36,850
Accumulated Amortization	(19,239)		(19,239)		(18,459)
Total	16,411		16,411		18,391
Intangible amortization expense	991	$ 1,050	1,981	$ 2,101
Goodwill, Impairment Loss			0
Identifiable customer intangibles
Goodwill
Gross Carrying Amount	31,857		31,857		31,857
Accumulated Amortization	(15,888)		(15,888)		(14,287)
Total	15,969		15,969		17,570
Core deposit intangible assets
Goodwill
Gross Carrying Amount	3,793		3,793		4,993
Accumulated Amortization	(3,351)		(3,351)		(4,172)
Total	$ 442		$ 442		$ 821

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

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