Income Taxes Temporary Differences (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Effective Income Tax Rate [Line Items]
Allowance for loan losses	$ 7,251	$ 5,694
Available-for-sale investment securities	2,644	941
Deferred compensation	3,593	749
Supplemental retirement	152	170
Core deposit premium and other intangible assets	657	664
Deferred Tax Assets, Equity Method Investments	0	126
Other-than-temporary impairment on securities	0	317
Stock compensation expense	43	0
Purchase accounting	0	475
Acquisition costs	190	210
Other	977	596
Total gross deferred tax assets	15,507	9,942
Deferred loan costs	126	26
Intangibles amortization	4,135	3,685
Prepaid expenses	297	232
Deferred Tax Liabilities, Other	232	158
FHLB stock dividend	81	58
Deferred Tax Liabilities, Intangible Assets	6,066	0
Depreciation	2,149	1,207
Accumulated accretion	199	112
Mortgage servicing rights	578	240
Total gross deferred tax liabilities	13,863	5,718
Net deferred tax assets	$ 1,644	$ 4,224
Statutory U.S. Federal Tax Rate	21.00%	35.00%
Scenario, Plan [Member]
Effective Income Tax Rate [Line Items]
Statutory U.S. Federal Tax Rate	21.00%