Goodwill and Intangible Assets Amortization Expense (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Total Amortization Expense [Abstract]
Amortization of intangible assets	$ 505	$ 547
Estimated Amortization Expense [Abstract]
For period 04/01/18-12/31/18	1,449
For year ended 12/31/19	1,778
For year ended 12/31/20	1,576
For year ended 12/31/21	1,304
For year ended 12/31/22	1,195
For year ended 12/31/23	1,098
Core Deposits [Member]
Total Amortization Expense [Abstract]
Amortization of intangible assets	420	471
Customer Lists [Member]
Total Amortization Expense [Abstract]
Amortization of intangible assets	46	46
Mortgage Servicing Rights [Member]
Total Amortization Expense [Abstract]
Amortization of intangible assets	$ 39	$ 30	$ 141