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Trust Preferred Securities (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Mar. 31, 2022 | Dec. 31, 2021
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. The issuers of these securities have not yet determined the replacement rate index for LIBOR. These securities may be included in Tier 1 capital and may be prepaid at any time without penalty (with certain limitations applicable) under current regulatory guidelines and interpretations. |
Capital securities | $ 10.3 | $ 10.3
Maturity date | Sep. 15, 2035 |

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