Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Available for sale securities, amortized cost	$ 780,304	$ 632,967
Held-to-maturity securities, fair value	$ 45,853	$ 48,442
Preferred stock, shares authorized	50,000	50,000
Preferred stock, shares issued	0	0
Common stock, shares authorized	24,000,000	24,000,000
Common stock, shares issued	18,931,200	15,426,973
Treasury stock, shares	586,688	590,246