Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Investment securities held to maturity, at fair value	$ 1,267,546	$ 1,647,360
Loans receivable, allowance for loan losses	$ 25,255	$ 18,964
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, liquidation value per share (in dollars per share)	$ 25.00	$ 25.00
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, shares issued (in shares)	1,471,000	2,000,000
Preferred stock, shares outstanding (in shares)	1,471,000	2,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	64,315,909	59,471,998
Common stock, shares outstanding (in shares)	63,787,064	58,943,153
Treasury stock (in shares)	503,408	503,408
Stock held by deferred compensation plan (in shares)	25,437	25,437