Consolidated Balance Sheets (Parentheticals) - USD ($) $ / shares in Thousands	Dec. 31, 2018	Dec. 31, 2017
Loans, allowance	$ 8,880,000	$ 8,202,000
Common stock, par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	39,000,000	39,000,000
Series E Preferred Stock [Member]
Preferred stock, issued (in shares)		6,198
Preferred stock, outstanding (in shares)		6,198
Preferred stock, liquidation preference		$ 6,200
Preferred stock, no par (in dollars per share)	$ 0	$ 0
Series F Preferred Stock [Member]
Preferred stock, issued (in shares)		4,304
Preferred stock, outstanding (in shares)		4,304
Preferred stock, liquidation preference		$ 4,300
Preferred stock, no par (in dollars per share)	$ 0	$ 0
Voting Common Stock [Member]
Common stock, shares issued (in shares)	6,242,720	6,039,864
Common stock, shares outstanding (in shares)	6,242,720	6,039,864
Nonvoting Common Stock [Member]
Common stock, shares issued (in shares)	1,220,000	220,000
Common stock, shares outstanding (in shares)	1,220,000	220,000