Derivative Instruments - Gain (loss) recognized on derivatives instruments (Details) - Not designated as hedging - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Gain (loss) recognized on derivative instruments
Total gain/(loss) from derivative instruments	$ (1,931)	$ 1,507	$ (2)
Interest rate lock commitments | Mortgage banking
Gain (loss) recognized on derivative instruments
Total gain/(loss) from derivative instruments	8,798	1,216	14
Interest rate lock commitments | Other noninterest income
Gain (loss) recognized on derivative instruments
Total gain/(loss) from derivative instruments	(3)
Forward loan sales commitments | Mortgage banking
Gain (loss) recognized on derivative instruments
Total gain/(loss) from derivative instruments	2,271	400	$ (16)
TBA mortgage backed securities | Mortgage banking
Gain (loss) recognized on derivative instruments
Total gain/(loss) from derivative instruments	$ (12,997)	$ (109)