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Short-term borrowings (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Assets Sold Under Agreements To Repurchase [Line Items]    
Amount of Advances $ 66,980,000 $ 42,841,000
Weighted Average    
Assets Sold Under Agreements To Repurchase [Line Items]    
Weighted Average Interest Rate 1.39% 1.78%
Pledged    
Assets Sold Under Agreements To Repurchase [Line Items]    
Amount of Advances $ 0 $ 75,000,000
Pledged | Weighted Average    
Assets Sold Under Agreements To Repurchase [Line Items]    
Weighted Average Interest Rate   1.33%
Pledged | Repurchase advance    
Assets Sold Under Agreements To Repurchase [Line Items]    
Amount of Advances   $ 50,000,000
Pledged | Repurchase advance | Weighted Average    
Assets Sold Under Agreements To Repurchase [Line Items]    
Weighted Average Interest Rate   1.63%
Pledged | Fixed rate advances    
Assets Sold Under Agreements To Repurchase [Line Items]    
Amount of Advances   $ 25,000,000
Pledged | Fixed rate advances | Weighted Average    
Assets Sold Under Agreements To Repurchase [Line Items]    
Weighted Average Interest Rate   0.72%