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Trust Preferred Securities	12 Months Ended
Trust Preferred Securities	Dec. 31, 2017
Trust Preferred Securities [Abstract]
Trust Preferred Securities	Note 12: Trust Preferred Securities 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 (with certain limitations applicable) under current regulatory guidelines and interpretations. The balance of the Capital Securities as of December 31, 2017 and 2016 was $10.3 million, with a maturity date of September 15, 2035.