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Derivatives and hedging activities - Fair Values of Derivative Instruments on the Balance Sheet (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021 USD ($) security	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) security	Jun. 30, 2020 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Derivatives, Fair Value
Asset Derivatives	$ 11,326		$ 11,326			$ 15,371
Liability Derivatives	9,777		9,777			14,099
Interest Receivable	7,844		7,844			8,255
Interest Payable	469		469			736
Net Amounts of Assets presented in the Balance Sheet	9,777		9,777			14,099
Interest expense
Derivatives, Fair Value
Amount of gain or (loss) reclassified as a increase to interest income (expense)		$ 73	(48)	$ 73
Interest income
Derivatives, Fair Value
Amount of gain or (loss) reclassified as a increase to interest income (expense)	150	$ 126	300	$ 178
Interest Rate Floor
Derivatives, Fair Value
Asset Derivatives	1,303		1,303			1,678
Interest Rate Swaps
Derivatives, Fair Value
Asset Derivatives	10,023		10,023			13,693
Credit-risk contract
Derivatives, Fair Value
Posted collateral	8,030		8,030			15,360
Net Amounts of Assets presented in the Balance Sheet	5,729		5,729			12,421
Derivatives designated as hedging instruments
Derivatives, Fair Value
Asset Derivatives	1,303		1,303			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
Asset Derivatives	1,303		1,303			1,678
Derivatives not designated as hedging instruments
Derivatives, Fair Value
Asset Derivatives	10,023		10,023			13,693
Liability Derivatives	$ 9,777		$ 9,777			13,614
Derivatives not designated as hedging instruments | Interest Rate Swaps
Derivatives, Fair Value
Number of instruments held | security	82		82
Notional amount	$ 401,874		$ 401,874			375,341
Derivatives not designated as hedging instruments | Interest Rate Swaps | Other Assets.
Derivatives, Fair Value
Asset Derivatives	10,023		10,023			13,693
Derivatives not designated as hedging instruments | Interest Rate Swaps | Other Liabilities.
Derivatives, Fair Value
Liability Derivatives	9,777		9,777			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)					$ 536

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