Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Investment securities held to maturity, at fair value	$ 653,109	$ 747,323
Loans receivable, allowance for loan losses	$ 9,266	$ 8,615
Preferred stock par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
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)	59,371,623	59,318,073
Common stock, shares outstanding (in shares)	58,842,778	58,789,228
Treasury stock (in shares)	503,408	503,408
Stock held by deferred compensation plan (in shares)	25,437	25,437