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Other Derivatives - Designated cash flow hedges (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Designated Cash Flow Hedge    
Gain or (loss) on cash flow hedging relationships in Subtopic 815-20    
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income as a result that a forecasted transaction is no longer probable of occurring   $ (829)
Interest Expenses    
Gain or (loss) on cash flow hedging relationships in Subtopic 815-20    
Total amounts of income and expense line items presented in the statement of financial performance in which the effects of fair value or cash flow hedges are recorded $ 28 462
Interest Expenses | Designated Cash Flow Hedge    
Gain or (loss) on cash flow hedging relationships in Subtopic 815-20    
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income 28 462
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income - Included Component $ 28 $ 462