Nature of Business and Significant Accounting Policies (Details) $ in Millions		3 Months Ended
	Jan. 01, 2020 USD ($)	Mar. 31, 2020 USD ($) item
Nature Of Business And Significant Accounting Policies [Line Items]
Number of branches | item		11
Number of representative offices | item		2
Lease, Practical Expedients, Package [true false]	true
Operating Lease, Right-of-Use Asset		$ 6.6
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]		Other Assets
Operating Lease, Liability		$ 6.6
Operating Lease, Liability, Statement of Financial Position [Extensible List]		Accrued Liabilities and Other Liabilities
Accounting Standards Update 2016-02
Nature Of Business And Significant Accounting Policies [Line Items]
Operating Lease, Right-of-Use Asset	$ 6.7
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Other Assets
Operating Lease, Liability	$ 6.7
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Accrued Liabilities and Other Liabilities