CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parentheticals) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement Of Stockholders Equity [Abstract]
Tax on change in unrealized loss on securities available for sale	$ 157	$ 177	$ 983	$ 746
Accretion on change in unrecognized loss on securities held to maturity, portion of OTTI	$ 4	$ 4	$ 10	$ 10
Common stock dividends per share (in dollars per share)	$ 0.09	$ 0.08	$ 0.27	$ 0.24
Issuance of common shares under Stock Incentive Plan (in shares)	54,450	5,300	73,900	115,300