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Intangible assets, net - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets
Gross carrying amount of intangible assets	$ 1,091	$ 1,091
Amortization of intangibles	881	1,034	$ 1,186
Core Deposit
Finite-Lived Intangible Assets
Gross carrying amount of intangible assets	8,146	8,146
Accumulated amortization on intangible assets	6,515	5,810
Trade Name
Finite-Lived Intangible Assets
Gross carrying amount of intangible assets	203	203
Accumulated amortization on intangible assets	149	128
Asset Management And Retirement Plan Services
Finite-Lived Intangible Assets
Accumulated amortization on intangible assets	$ 480	$ 324

X

- Definition

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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