Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Jan. 01, 2019 USD ($) item
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in mortgage banking revenue	$ 1,108	$ 740	$ 2,915	$ 1,970
Lease, Practical Expedients, Package [true false]			true
Lease, Practical Expedient, Use of Hindsight [true false]			false
Right-of use assets for operating leases	$ 2,534		$ 2,534
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Other assets		Other assets
Lease liabilities for operating leases	$ 2,572		$ 2,572
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Accounts Payable and Other Accrued Liabilities		Accounts Payable and Other Accrued Liabilities
Number of leased properties | item					5
Number of leased pieces of equipment | item					6
ASU 2016‑02 | Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of use assets for operating leases					$ 2,700
Lease liabilities for operating leases					$ 2,700