Income Taxes Temporary Differences (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Effective Income Tax Rate [Line Items]
Allowance for loan losses	$ 5,694	$ 6,599
Available-for-sale investment securities	941	3,680
Deferred compensation	749	1,030
Supplemental retirement	170	259
Core deposit premium and other intangible assets	664	691
Deferred Tax Assets, Equity Method Investments	126	0
Other-than-temporary impairment on securities	317	438
Stock Compensation Expense	0	194
Deferred Revenue	0	101
Purchase Accounting	475	1,791
Acquisition Costs	210	319
Other	596	966
Total gross deferred tax assets	9,942	16,068
Deferred loan costs	26	178
Intangibles amortization	3,685	4,467
Prepaid expenses	232	383
Deferred Tax Liabilities, Other	158	380
FHLB stock dividend	58	0
Depreciation	1,207	740
Accumulated accretion	112	72
Mortgage servicing rights	240	387
Total gross deferred tax liabilities	5,718	6,607
Net deferred tax assets	$ 4,224	$ 9,461
Statutory U.S. Federal Tax Rate	35.00%
Scenario, Plan [Member]
Effective Income Tax Rate [Line Items]
Statutory U.S. Federal Tax Rate	21.00%