Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash dividends declared	$ 2.20	$ 1.98	$ 1.78
Exercise of stock options	11,721	29,633	16,639
Stock Issued During Period, Shares, New Issues	0	0	440,604
Purchase of treasury shares	260,674	290,491	0
Poage Bankshares, Inc. [Member]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares		1,100,000