Trust Preferred Securities (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2020	Dec. 31, 2019
Trust Preferred Securities [Abstract]
Trust preferred securities, Description	On September 15, 2005, RST II, a wholly-owned subsidiary of the Company, closed a pooled private offering of 10,000 Capital Securities with a liquidation amount of $1,000 per security. The proceeds of the offering were loaned to the Company in exchange for junior subordinated debentures with terms similar to the Capital Securities. Distributions on the Capital Securities are payable quarterly at a variable rate that is based upon the 3-month LIBOR plus 1.80 percent and are included in interest expense in the consolidated financial statements. These securities may be included in Tier 1 capital and may be prepaid at anytime without penalty (with certain limitations applicable) under current regulatory guidelines and interpretations
Capital Securities	$ 10.3	$ 10.3
Maturity date of capital securities	Sep. 15, 2035

Trust Preferred Securities (Details) - USD ($)
$ in Millions

3 Months Ended

12 Months Ended

Mar. 31, 2020

Dec. 31, 2019

Trust Preferred Securities [Abstract]

On September 15, 2005, RST II, a wholly-owned subsidiary of the Company, closed a pooled private offering of 10,000 Capital Securities with a liquidation amount of $1,000 per security. The proceeds of the offering were loaned to the Company in exchange for junior subordinated debentures with terms similar to the Capital Securities. Distributions on the Capital Securities are payable quarterly at a variable rate that is based upon the 3-month LIBOR plus 1.80 percent and are included in interest expense in the consolidated financial statements. These securities may be included in Tier 1 capital and may be prepaid at anytime without penalty (with certain limitations applicable) under current regulatory guidelines and interpretations

Capital Securities

$ 10.3

Maturity date of capital securities

Sep. 15, 2035