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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 ($)	Jun. 30, 2019 USD ($) security	Dec. 31, 2018 USD ($)
Derivatives, Fair Value
Asset Derivatives		$ 4,833	$ 661
Liability Derivatives		4,183	138
Interest Receivable		7,303	7,115
Interest Payable		1,058	1,195
Derivatives designated as hedging instruments
Derivatives, Fair Value
Asset Derivatives		1,025	553
Derivatives designated as hedging instruments \| Interest Rate Floor
Derivatives, Fair Value
Notional amount		25
Asset Derivatives			553
Derivatives designated as hedging instruments \| Interest Rate Floor \| Other Assets.
Derivatives, Fair Value
Asset Derivatives		1,025
Derivatives designated as hedging instruments \| Interest Rate Swaps \| Other Assets.
Derivatives, Fair Value
Asset Derivatives		3,807	108
Derivatives designated as hedging instruments \| Interest Rate Swaps \| Other Liabilities.
Derivatives, Fair Value
Liability Derivatives		4,182	138
Derivatives not designated as hedging instruments
Derivatives, Fair Value
Asset Derivatives		3,807	108
Liability Derivatives		$ 4,182	138
Derivatives not designated as hedging instruments \| Interest Rate Swaps
Derivatives, Fair Value
Number of instruments held \| security		22
Notional amount		$ 123,351
Interest Receivable			13
Interest Payable			$ 13
Forecast \| Cash Flow Hedge \| Interest income
Derivatives, Fair Value
Amount of gain or (loss) reclassified as a reduction to interest income	$ 64