Regulatory Capital Requirements (Narrative) (Details) $ in Millions			12 Months Ended
	Jan. 01, 2019	Jan. 01, 2016	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Regulatory Capital Requirements [Abstract]
Capital conversation buffer (as a percent)		0.625%	2.50%
Bank specific capital conversation buffer (as a percent)			6.25%
Capital conservation buffer, minimum ratios, as a percent			2.50%
Due to affiliate, current			$ 0.0	$ 0.0
Common Equity Tier 1 required for capital adequacy purposes, ratio (as a percent)			7.00%
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets			8.50
Capital Required for Capital Adequacy to Risk Weighted Assets			10.50
Tier One Leverage Capital Required for Capital Adequacy to Average Assets			4.00
Common Equity Tier 1 required for well capitalized to risk weighted assets (as a percent)			6.50%
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets			8.00
Capital Required to be Well Capitalized to Risk Weighted Assets			10.00
Tier One Leverage Capital Required to be Well Capitalized to Average Assets			5.00
Payment of dividends			$ 0.0	$ 0.0
Common equity Tier 1 capital to risk-weighted assets minimum ratio			4.50%
Common equity tier one risk based capital required for capital adequacy to risk weighted asset raised			6.00%
Common equity tier one risk based capital required for capital adequacy to risk weighted asset total			4.00%
Additional capital conservation buffer in percentage	0.625%
Capital conservation buffer in percentage final	2.50%