Derivative Instruments - Gain (loss) recognized on derivatives instruments (Details) - Not designated as hedging - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Gain (loss) recognized on derivative instruments
Gain (loss) recognized on derivatives instruments	$ 2,269	$ 224	$ 3,279	$ 2,374
Interest rate lock commitments | Mortgage banking/other noninterest income
Gain (loss) recognized on derivative instruments
Gain (loss) recognized on derivatives instruments	5,647	(257)	11,226	2,024
Forward loan sales commitments | Mortgage banking
Gain (loss) recognized on derivative instruments
Gain (loss) recognized on derivatives instruments	369	(199)	1,152	454
TBA mortgage backed securities | Mortgage banking
Gain (loss) recognized on derivative instruments
Gain (loss) recognized on derivatives instruments	$ (3,747)	$ 680	$ (9,099)	$ (104)