Derivative Instruments (Details) - Not designated as hedging - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Derivative Instruments
Fair Value, Derivative Assets	$ 14,678	$ 1,621
Fair Value, Derivative Liabilities	1,960	109
Notional Amount, Derivative Assets	455,623	58,499
Notional Amount, Derivative Liabilities	380,063	68,500
Interest rate lock commitments | Accrued interest and other assets
Derivative Instruments
Fair Value, Derivative Assets	13,133	1,228
Notional Amount, Derivative Assets	401,313	45,715
Forward loan sales commitments | Accrued interest and other assets
Derivative Instruments
Fair Value, Derivative Assets	1,545	393
Notional Amount, Derivative Assets	54,310	12,784
TBA mortgage backed securities | Accrued expenses and other liabilities
Derivative Instruments
Fair Value, Derivative Liabilities	1,960	109
Notional Amount, Derivative Liabilities	$ 380,063	$ 68,500