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Fair value estimates - Schedule of Assets and Liabilities Measured at Fair Value on Nonrecurring Basis (Details) - Nonrecurring Basis - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Impaired loans	$ 2,699	$ 1,808
Other real estate owned	550	283
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Impaired loans	2,699	1,808
Other real estate owned	$ 550	$ 283

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