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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, 2019 USD ($)	Dec. 31, 2018 USD ($) security	Dec. 31, 2017 USD ($)
Derivatives, Fair Value
Asset Derivatives		$ 661	$ 655
Liability Derivatives		138	733
Interest Receivable		7,115	6,936
Interest Payable		1,195	497
Interest income
Derivatives, Fair Value
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		$ 13
Interest Rate Swaps
Derivatives, Fair Value
Number of instruments held \| security		12
Derivatives designated as hedging instruments
Derivatives, Fair Value
Asset Derivatives		$ 553
Derivatives designated as hedging instruments \| Interest Rate Floor
Derivatives, Fair Value
Notional amount		25,000
Derivatives designated as hedging instruments \| Interest Rate Floor \| Other Assets.
Derivatives, Fair Value
Asset Derivatives		553
Derivatives not designated as hedging instruments
Derivatives, Fair Value
Asset Derivatives		108	655
Liability Derivatives		138	733
Derivatives not designated as hedging instruments \| Interest Rate Swaps
Derivatives, Fair Value
Notional amount		62,071
Interest Receivable			28
Interest Payable			28
Derivatives not designated as hedging instruments \| Interest Rate Swaps \| Other Assets.
Derivatives, Fair Value
Asset Derivatives		108	655
Derivatives not designated as hedging instruments \| Interest Rate Swaps \| Other Liabilities.
Derivatives, Fair Value
Liability Derivatives		$ 138	$ 733
Forecast \| Cash Flow Hedge \| Interest Rate Floor \| Interest income
Derivatives, Fair Value
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ 64