Other Derivatives - Cash flow hedges (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) recognized in OCI	$ 0	$ (28)	$ (1)	$ (2,017)
Designated Cash Flow Hedge
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) recognized in OCI	0	(27)	(844)	(1,548)
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income	(60)	(394)	(445)	(366)
Designated Cash Flow Hedge | Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income	(60)	(394)	(445)	(366)
Designated Cash Flow Hedge | Interest Rate Products
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) recognized in OCI	$ 0	$ (27)	$ (844)	$ (1,548)