Derivatives and Hedging Activities - Effect of derivatives in hedging relationships (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Derivative Instruments [Line Items]
Total interest expense presented in the consolidated statements of income	$ (29,760)	$ (56,237)	$ (83,312)
Fair value hedging | Interest expense
Effect of hedging relationships on interest expense:
Net income (expense) recognized	210	281	(360)
Cash flow hedging | Interest expense
Effect of hedging relationships on interest expense:
Net income (expense) recognized	(608)	(359)	$ 0
Premium amortization expense excluded from assessment of hedge effectiveness	$ 472	$ 329