Income Taxes Components of the net deferred tax asset (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Components of the net deferred tax asset [Line Items]
Bad debts	$ 1,329	$ 1,244
Deferred compensation	227	205
Core deposit intangible	106	94
Unrealized loss on investment securities available-for-sale	0	272
Other	69	38
Total deferred tax asset	1,731	1,853
Depreciation	(1,402)	(913)
Mortgage servicing rights	(371)	(360)
Limited partnership investments	(50)	(16)
Unrealized gain on investment securities available-for-sale	(262)	0
Goodwill	(276)	(244)
Prepaid expenses	(136)	(114)
Total deferred tax liability	(2,497)	(1,647)
Net deferred tax (liability) asset	$ (766)
Net deferred tax (liability) asset		$ 206