Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Amortized intangible assets [Abstract]
Gross carrying value	[1]	$ 3,633		$ 3,633		$ 3,516
Accumulated amortization	[1]	(1,930)		(1,930)		(1,563)
Net carrying value	[1]	1,703		1,703		1,953
Unamortized intangible assets [Abstract]
Goodwill		23,296		23,296		23,296
Actual and Estimated Future Amortization Expense [Abstract]
Amortization expense		120	$ 118	367	$ 357
Estimated Amortization Expense [Abstract]
Remaining 2018		114		114
2019		432		432
2020		334		334
2021		271		271
2022		211		211
MSRs [Member]
Amortized intangible assets [Abstract]
Gross carrying value	[1]	1,722		1,722		1,605
Accumulated amortization	[1]	(1,055)		(1,055)		(912)
Net carrying value	[1]	667		667		693
Actual and Estimated Future Amortization Expense [Abstract]
Amortization expense		46	44	143	134
Estimated Amortization Expense [Abstract]
Remaining 2018		43		43
2019		173		173
2020		137		137
2021		106		106
2022		78		78
Core Deposit Intangibles [Member]
Amortized intangible assets [Abstract]
Gross carrying value	[1]	1,786		1,786		1,786
Accumulated amortization	[1]	(786)		(786)		(586)
Net carrying value	[1]	1,000		1,000		1,200
Actual and Estimated Future Amortization Expense [Abstract]
Amortization expense		66	66	200	200
Estimated Amortization Expense [Abstract]
Remaining 2018		64		64
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]	(89)		(89)		(65)
Net carrying value	[1]	36		36		$ 60
Actual and Estimated Future Amortization Expense [Abstract]
Amortization expense		8	$ 8	24	$ 23
Estimated Amortization Expense [Abstract]
Remaining 2018		7		7
2019		29		29
2020		0		0
2021		0		0
2022		$ 0		$ 0

[1] Excludes fully amortized intangible assets.