Regulatory Capital (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended
	Mar. 31, 2020	Jan. 01, 2020
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Option to delay term	2 years
Transition period	3 years
Transition period start date	Jan. 01, 2022
Initial non-PCD Charge	$ 106.0
Percentage of scaling factor of change in reserve for Non-PCD Loans	25.00%
Percentage of scaling factor of change in Non-PCD ACL year two	25.00%
Percentage of transitional benefits recognized in regulatory capital in year three	75.00%
Percentage of transitional benefits recognized in regulatory capital in year four	50.00%
Percentage of transitional benefits recognized in regulatory capital in year five	25.00%
Increase to CET1 Capital	$ 188.0
Mutual of Omaha Bank ("MOB")
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Initial non-PCD Charge	$ 424.0
Initial non-PCD charge percentage	25.00%
ASU 2016-13 | Retained Earnings
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Cumulative effect adjustment, decrease in retained earnings		$ 82.4