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Derivatives and hedging activities - Fair Values of Derivative Instruments on the Balance Sheet (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) security	Dec. 31, 2018 USD ($)
Derivatives, Fair Value
Asset Derivatives		$ 5,672	$ 661
Liability Derivatives		4,680	138
Interest Receivable		6,981	7,115
Interest Payable		1,277	1,195
Interest income
Derivatives, Fair Value
Amount of gain or (loss) reclassified as a reduction to interest income		42	13
Interest Rate Floor
Derivatives, Fair Value
Asset Derivatives		$ 944	553
Interest Rate Swaps
Derivatives, Fair Value
Number of instruments held \| security		30
Asset Derivatives		$ 4,728	108
Derivatives designated as hedging instruments
Derivatives, Fair Value
Asset Derivatives		944	553
Derivatives designated as hedging instruments \| Interest Rate Floor
Derivatives, Fair Value
Notional amount		25,000
Asset Derivatives			553
Derivatives designated as hedging instruments \| Interest Rate Floor \| Other Assets.
Derivatives, Fair Value
Asset Derivatives		944
Derivatives not designated as hedging instruments
Derivatives, Fair Value
Asset Derivatives		4,728	108
Liability Derivatives		4,680	138
Derivatives not designated as hedging instruments \| Interest Rate Swaps
Derivatives, Fair Value
Notional amount		172,096
Interest Receivable			55
Interest Payable			55
Derivatives not designated as hedging instruments \| Interest Rate Swaps \| Other Assets.
Derivatives, Fair Value
Asset Derivatives		4,728	108
Derivatives not designated as hedging instruments \| Interest Rate Swaps \| Other Liabilities.
Derivatives, Fair Value
Liability Derivatives		$ 4,680	$ 138
Forecast \| Cash Flow Hedge \| Interest Rate Floor \| Interest income
Derivatives, Fair Value
Amount of gain or (loss) reclassified as a reduction to interest income	$ 64