Other Derivatives - Cash flow hedges (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Amount of Gain or (Loss) recognized in OCI	$ 31	$ 24	$ (1,986)	$ (2,210)
Designated Cash Flow Hedge
Amount of Gain or (Loss) recognized in OCI	31	(107)	(1,517)	(1,974)
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income	(389)	264	(755)	1,868
Designated Cash Flow Hedge | Interest Expense
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income	(389)	264	(755)	1,039
Designated Cash Flow Hedge | Interest Rate Product | Gain on sale of investment securities
Amount of Gain or (Loss) recognized in OCI				0
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income				829
Designated Cash Flow Hedge | Interest Rate Products
Amount of Gain or (Loss) recognized in OCI	$ 31	$ (107)
Designated Cash Flow Hedge | Interest Rate Products | Interest Expense
Amount of Gain or (Loss) recognized in OCI			$ (1,517)	$ (1,974)