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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, 2021 USD ($)	Dec. 31, 2020 USD ($) security	Dec. 31, 2019 USD ($)
Derivatives, Fair Value
Asset Derivatives		$ 15,371	$ 5,672
Liability Derivatives		14,099	4,680
Interest Receivable		8,255	6,981
Interest Payable		736	1,277
Net Amounts of Assets presented in the Balance Sheet		14,099	4,680
Interest income
Derivatives, Fair Value
Amount of gain or (loss) reclassified as a increase to interest income (expense)		150	42
Interest Rate Floor
Derivatives, Fair Value
Asset Derivatives		1,678	944
Interest Rate Swaps
Derivatives, Fair Value
Asset Derivatives		13,693	4,728
Credit-risk contract
Derivatives, Fair Value
Posted collateral		15,360	4,140
Net Amounts of Assets presented in the Balance Sheet		79	48
Derivatives designated as hedging instruments
Derivatives, Fair Value
Asset Derivatives		1,678	944
Liability Derivatives		485
Derivatives designated as hedging instruments | Interest Rate Floor
Derivatives, Fair Value
Notional amount		25,000
Asset Derivatives			944
Derivatives designated as hedging instruments | Interest Rate Floor | Other Assets
Derivatives, Fair Value
Asset Derivatives		1,678
Derivatives not designated as hedging instruments
Derivatives, Fair Value
Asset Derivatives		13,693	4,728
Liability Derivatives		$ 13,614	4,680
Derivatives not designated as hedging instruments | Interest Rate Swaps
Derivatives, Fair Value
Number of instruments held | security		73
Notional amount		$ 375,341	172,096
Interest Receivable			235
Interest Payable			235
Derivatives not designated as hedging instruments | Interest Rate Swaps | Other Assets
Derivatives, Fair Value
Asset Derivatives		13,693	4,728
Derivatives not designated as hedging instruments | Interest Rate Swaps | Other Liabilities.
Derivatives, Fair Value
Liability Derivatives		13,614	$ 4,680
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)	$ 50,000

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