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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, 2021 USD ($) security	Mar. 31, 2020 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Derivatives, Fair Value
Asset Derivatives	$ 11,542			$ 15,371
Liability Derivatives	9,603			14,099
Interest Receivable	8,206			8,255
Interest Payable	1,120			736
Net Amounts of Assets presented in the Balance Sheet	9,603			14,099
Interest income
Derivatives, Fair Value
Amount of gain or (loss) reclassified as a increase to interest income (expense)	150	$ 52
Interest Rate Floor
Derivatives, Fair Value
Asset Derivatives	1,455			1,678
Interest Rate Swaps
Derivatives, Fair Value
Asset Derivatives	10,239			13,693
Credit-risk contract
Derivatives, Fair Value
Posted collateral	5,850			15,360
Net Amounts of Assets presented in the Balance Sheet	484			79
Derivatives designated as hedging instruments
Derivatives, Fair Value
Asset Derivatives	1,455			1,678
Liability Derivatives				485
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	1,455			1,678
Derivatives not designated as hedging instruments
Derivatives, Fair Value
Asset Derivatives	9,980			13,693
Liability Derivatives	$ 9,496			13,614
Derivatives not designated as hedging instruments | Interest Rate Swaps
Derivatives, Fair Value
Number of instruments held | security	83
Notional amount	$ 408,138	$ 225,376
Interest Receivable				258
Interest Payable				258
Derivatives not designated as hedging instruments | Interest Rate Swaps | Other Assets.
Derivatives, Fair Value
Asset Derivatives	9,980			13,693
Derivatives not designated as hedging instruments | Interest Rate Swaps | Other Liabilities.
Derivatives, Fair Value
Liability Derivatives	9,496			13,614
Cash Flow Hedge
Derivatives, Fair Value
Derivatives terminated	50
Cash Flow Hedge | Interest expense
Derivatives, Fair Value
Termination fees	25
Cash Flow Hedge | Derivatives designated as hedging instruments
Derivatives, Fair Value
Notional amount	$ 50,000
Cash Flow Hedge | Derivatives designated as hedging instruments | Other Liabilities.
Derivatives, Fair Value
Liability Derivatives				$ 485
Forecast | Cash Flow Hedge | Interest income
Derivatives, Fair Value
Amount of gain or (loss) reclassified as a increase to interest income (expense)			$ 404

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