Significant Accounting Policies Narrative Data (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) segment shares	Dec. 31, 2019 USD ($)
Class of Stock [Line Items]
Amortization period	10 years
Federal home loan bank stock | $	$ 1.0	$ 2.5
COLI limit, percentage	15.00%
Number of reportable segments | segment	1
2014 Equity Plan
Class of Stock [Line Items]
Shares authorized for equity awards (in shares) | shares	50,000