Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jan. 01, 2019 USD ($) item
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in mortgage banking revenue	$ 3,747	$ 2,561
Lease, Practical Expedients, Package [true false]	true
Lease, Practical Expedient, Use of Hindsight [true false]	false
Right-of use assets for operating leases	$ 2,538
Lease liabilities	$ 2,597
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			$ 2,700