Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Loans held for investment, covered	$ 9,680	$ 12,861
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, authorized (in shares)	50,000,000	50,000,000
Common stock, issued (in shares)	24,319,076	24,238,907
Common stock, outstanding (in shares)	17,722,507	18,376,991
Undesignated Par Value [Member]
Preferred stock, no par value (in dollars per share)	$ 0	$ 0
Preferred stock, authorized (in shares)	1,000,000	1,000,000
Designated Par Value [Member]
Preferred stock, authorized (in shares)	25,000	25,000
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, outstanding (in shares)	0	0