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Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Amortized intangible assets [Abstract]
Gross carrying value	[1]	$ 3,567		$ 3,567		$ 3,516
Accumulated amortization	[1]	(1,811)		(1,811)		(1,563)
Net carrying value	[1]	1,756		1,756		1,953
Unamortized intangible assets [Abstract]
Goodwill		23,296		23,296		23,296
Actual and Estimated Future Amortization Expense [Abstract]
Amortization expense		122	$ 118	247	$ 240
Estimated Amortization Expense [Abstract]
Remaining 2018		233		233
2019		416		416
2020		320		320
2021		259		259
2022		202		202
MSRs [Member]
Amortized intangible assets [Abstract]
Gross carrying value	[1]	1,656		1,656		1,605
Accumulated amortization	[1]	(1,009)		(1,009)		(912)
Net carrying value	[1]	647		647		693
Actual and Estimated Future Amortization Expense [Abstract]
Amortization expense		48	45	97	91
Estimated Amortization Expense [Abstract]
Remaining 2018		88		88
2019		157		157
2020		123		123
2021		94		94
2022		69		69
Core Deposit Intangibles [Member]
Amortized intangible assets [Abstract]
Gross carrying value	[1]	1,786		1,786		1,786
Accumulated amortization	[1]	(721)		(721)		(586)
Net carrying value	[1]	1,065		1,065		1,200
Actual and Estimated Future Amortization Expense [Abstract]
Amortization expense		66	66	134	134
Estimated Amortization Expense [Abstract]
Remaining 2018		130		130
2019		230		230
2020		197		197
2021		165		165
2022		133		133
Covenant not to Compete [Member]
Amortized intangible assets [Abstract]
Gross carrying value	[1]	125		125		125
Accumulated amortization	[1]	(81)		(81)		(65)
Net carrying value	[1]	44		44		$ 60
Actual and Estimated Future Amortization Expense [Abstract]
Amortization expense		8	$ 7	16	$ 15
Estimated Amortization Expense [Abstract]
Remaining 2018		15		15
2019		29		29
2020		0		0
2021		0		0
2022		$ 0		$ 0
[1] Excludes fully amortized intangible assets.

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

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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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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