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Financial Instruments with Off Balance Sheet Risk - Narrative (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Letter of credit with FHLB    
Financial Instruments with Off Balance Sheet Risk    
Outstanding letters of credit $ 150 $ 150
Letter of credit with Bank of North Dakota    
Financial Instruments with Off Balance Sheet Risk    
Outstanding letters of credit 19,000 20,000
Collateralized loans $ 239,300 $ 242,000