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Short-term borrowings - Summary of Short-term Borrowings (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Short-term Debt    
Ending Balance $ 109,000,000 $ 86,500,000
FHLB advances    
Short-term Debt    
Ending Balance 109,000,000 86,500
Average Balance 121,954,000 133,834
Maximum Month-End Balance $ 133,725,000 $ 189,275
Weighted Average Rate for 2.70% 2.05%
Weighted Average Rate at 2.70% 2.62%