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Other Derivatives - Cash flow hedges (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Mar. 31, 2019
Gross Amount of Recognized Liabilities	$ 6,297		$ 6,297		$ 611
Amount of Gain or (Loss) recognized in OCI	(28)	$ (171)	(2,017)	$ (2,234)
Designated Cash Flow Hedge
Amount of Gain or (Loss) recognized in OCI	(27)	(834)	(1,548)	(1,867)
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income	(394)	313	(366)	1,604
Designated Cash Flow Hedge \| Interest Expense
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income			(366)	775
Designated Cash Flow Hedge \| Interest Rate Product \| Gain on sale of investment securities
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	(27)	$ (834)
Designated Cash Flow Hedge \| Interest Rate Products \| Interest Expense
Amount of Gain or (Loss) recognized in OCI			(1,548)	$ (1,867)
Designated Cash Flow Hedge \| Interest Rate Swap
Notional Amount	$ 100,000		$ 100,000		$ 100,000
Designated Cash Flow Hedge \| Interest Rate Swap \| Non-interest income
Gross Amount of Recognized Liabilities						$ 829