Summary of Significant Accounting Policies - Recently Issued Accounting Pronouncement (Details) - USD ($)		12 Months Ended
	Jan. 01, 2019	Dec. 31, 2019
Summary of Significant Accounting Policies
Right-of-use asset, net	$ 12,700,000	$ 11,580,000
Lease liability	13,200,000	12,183,000
Transfer of securities from held-to-maturity to available-for-sale	11,400,000	$ 11,390,000
Unrecognized gain, net of taxes, on transfer from held-to-maturity to available-for-sale	$ 304,000