Premises and Equipment - Lease (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) item	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Future Minimum Rent Commitments
Rent expense	$ 1,264
Rent Expense		$ 870	$ 774
Bloomington Downtown Minneapolis St Paul And Uptown Minneapolis
Future Minimum Rent Commitments
2020	776
2021	336
2022	327
2023	319
2024	324
Thereafter	1,130
Totals	$ 3,212
Lessee, Operating Lease, Existence of Option to Extend [true false]	true
Number of options to extend the lease Term | item	2
Lease Term	5 years
Greenwood Location
Future Minimum Rent Commitments
2020	$ 164
2021	111
Totals	$ 275
Lessee, Operating Lease, Existence of Option to Extend [true false]	true
Number of options to extend the lease Term | item	2
Lease Term	5 years