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Derivatives and hedging activities - Fair Values of Derivative Instruments on the Balance Sheet (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020 USD ($) security	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Mar. 31, 2019 USD ($)
Derivatives, Fair Value
Asset Derivatives	$ 16,645		$ 5,672
Liability Derivatives	14,762		4,680
Interest Receivable	7,283		6,981
Interest Payable	1,336		1,277
Net Amounts of Assets presented in the Balance Sheet	14,762		4,680
Interest income
Derivatives, Fair Value
Amount of gain or (loss) reclassified as a reduction to interest income	52
Interest Rate Floor
Derivatives, Fair Value
Asset Derivatives	1,966		944
Interest Rate Swaps
Derivatives, Fair Value
Asset Derivatives	14,679		4,728
Credit-risk contract
Derivatives, Fair Value
Posted collateral	13,090		5,120
Net Amounts of Assets presented in the Balance Sheet	83		48
Derivatives designated as hedging instruments
Derivatives, Fair Value
Asset Derivatives	1,966		944
Derivatives designated as hedging instruments | Interest Rate Floor
Derivatives, Fair Value
Notional amount	25
Asset Derivatives			944
Derivatives designated as hedging instruments | Interest Rate Floor | Other Assets.
Derivatives, Fair Value
Asset Derivatives	1,966
Derivatives designated as hedging instruments | Interest Rate Swaps | Other Assets.
Derivatives, Fair Value
Asset Derivatives	14,679		4,728
Derivatives designated as hedging instruments | Interest Rate Swaps | Other Liabilities.
Derivatives, Fair Value
Liability Derivatives	14,762		4,680
Derivatives not designated as hedging instruments
Derivatives, Fair Value
Asset Derivatives	14,679		4,728
Liability Derivatives	$ 14,762		4,680
Derivatives not designated as hedging instruments | Interest Rate Swaps
Derivatives, Fair Value
Number of instruments held | security	44
Notional amount	$ 225,376			$ 79,667
Interest Receivable			65
Interest Payable			$ 65
Forecast | Cash Flow Hedge | Interest income
Derivatives, Fair Value
Amount of gain or (loss) reclassified as a reduction to interest income		$ 64

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