Note 10 - Commitments and Contingent Liabilities (Details Textual) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Commitments to Extend Credit and Standby Letters of Credit [Member]
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability	$ 628,600	$ 636,900
Standby Letters of Credit [Member] | Minimum [Member]
Guarantee Obligations, Agreement Term	1 year
Standby Letters of Credit [Member] | Maximum [Member]
Guarantee Obligations, Agreement Term	2 years
Standby Letters of Credit [Member]
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability	$ 11,600	$ 12,800
Loss Contingency Accrual	$ 387