Derivative Instruments (Details) - Not designated as hedging - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Derivative Instruments
Fair Value, Derivative Assets	$ 2,483	$ 12
Fair Value, Derivative Liabilities	104	7
Notional Amount, Derivative Assets	107,270	33,858
Notional Amount, Derivative Liabilities	148,500	2,956
Interest rate lock commitments | Other assets.
Derivative Instruments
Fair Value, Derivative Assets	2,036	12
Notional Amount, Derivative Assets	89,608	33,858
Forward loan sales commitments | Other assets.
Derivative Instruments
Fair Value, Derivative Assets	447
Notional Amount, Derivative Assets	17,662
Forward loan sales commitments | Accrued expenses and other liabilities
Derivative Instruments
Fair Value, Derivative Liabilities		7
Notional Amount, Derivative Liabilities		$ 2,956
TBA mortgage backed securities | Accrued expenses and other liabilities
Derivative Instruments
Fair Value, Derivative Liabilities	104
Notional Amount, Derivative Liabilities	$ 148,500