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Derivatives and hedging activities - Fair Values of Derivative Instruments on the Balance Sheet (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021 USD ($) security	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) security	Sep. 30, 2020 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Derivatives, Fair Value
Interest rate floor and swaps	$ 10,690		$ 10,690			$ 15,371
Liability Derivatives	9,277		9,277			14,099
Interest Receivable	8,280		8,280			8,255
Interest Payable	872		872			736
Net Amounts of Assets presented in the Balance Sheet	9,277		9,277			14,099
Interest expense
Derivatives, Fair Value
Amount of gain or (loss) reclassified as a increase to interest income (expense)		$ (20)	(48)	$ 53
Interest income
Derivatives, Fair Value
Amount of gain or (loss) reclassified as a increase to interest income (expense)	153	$ 149	453	$ 327
Interest Rate Floor
Derivatives, Fair Value
Interest rate floor and swaps	1,159		1,159			1,678
Interest Rate Swaps
Derivatives, Fair Value
Interest rate floor and swaps	9,531		9,531			13,693
Credit-risk contract
Derivatives, Fair Value
Posted collateral	7,380		7,380			15,360
Net Amounts of Assets presented in the Balance Sheet	6,248		6,248			12,421
Derivatives designated as hedging instruments
Derivatives, Fair Value
Interest rate floor and swaps	1,159		1,159			1,678
Liability Derivatives						485
Derivatives designated as hedging instruments | Interest Rate Floor
Derivatives, Fair Value
Notional amount	25,000		25,000
Derivatives designated as hedging instruments | Interest Rate Floor | Other Assets.
Derivatives, Fair Value
Interest rate floor and swaps	1,159		1,159			1,678
Derivatives not designated as hedging instruments
Derivatives, Fair Value
Interest rate floor and swaps	9,531		9,531			13,693
Liability Derivatives	$ 9,277		$ 9,277			13,614
Derivatives not designated as hedging instruments | Interest Rate Swaps
Derivatives, Fair Value
Number of instruments held | security	84		84
Notional amount	$ 396,154		$ 396,154			375,341
Derivatives not designated as hedging instruments | Interest Rate Swaps | Other Assets.
Derivatives, Fair Value
Interest rate floor and swaps	9,531		9,531			13,693
Derivatives not designated as hedging instruments | Interest Rate Swaps | Other Liabilities.
Derivatives, Fair Value
Liability Derivatives	9,277		9,277			13,614
Cash Flow Hedge | Derivatives designated as hedging instruments
Derivatives, Fair Value
Derivatives terminated	25		25
Notional amount	$ 50,000		$ 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)					$ 538

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