Other Derivatives - Hedging instruments on statements of operations (Details) - Nonoperating Income (Expense) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Interest Rate Products
Derivatives not designated as cash flow hedging instruments under Subtopic 815-20
Derivative, Gain (Loss) on Derivative, Net	$ (40)	$ (7)	$ (326)	$ (7)
Other Contracts
Derivatives not designated as cash flow hedging instruments under Subtopic 815-20
Derivative, Gain (Loss) on Derivative, Net	(13)	(16)	(77)	(58)
Mortgage Banking
Derivatives not designated as cash flow hedging instruments under Subtopic 815-20
Derivative, Gain (Loss) on Derivative, Net	6,015	(380)	6,015	316
Not Designated as Hedging Instrument
Derivatives not designated as cash flow hedging instruments under Subtopic 815-20
Derivative, Gain (Loss) on Derivative, Net	$ 5,962	$ (403)	$ 5,612	$ 251