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Goodwill and Intangible Assets Mortgage Servicing Rights (Details) - USD ($)		3 Months Ended		9 Months Ended		12 Months Ended
	May 01, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets		$ (838,000)	$ (545,000)	$ (2,059,000)	$ (1,651,000)
Mortgage Servicing Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired				1,522,000	0	$ 0
Capitalization Of Mortgage Servicing Rights				7,000	0	0
Amortization of Intangible Assets		(123,000)	(33,000)	(242,000)	(105,000)	(141,000)
Finite-Lived Intangible Assets, Net		$ 2,131,000	$ 880,000	$ 2,131,000	$ 880,000	$ 844,000	$ 985,000
First BancTrust [Member] | Mortgage Servicing Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 1,522,000

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Capitalization Of Mortgage Servicing Rights

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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 increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

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