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Note 21 - Quarterly Financial Data (unaudited) (Tables)

12 Months Ended

Dec. 31, 2015

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information [Table Text Block]

		2015																2014
		4th				3rd				2nd				1st				4th				3rd				2nd				1st
		(In thousands, except per share data)
Quarterly operating data:
Interest income		$	52,468			$	51,913			$	50,222			$	49,543			$	49,171			$	49,177			$	49,569			$	49,211
Interest expense			13,052				12,603				12,082				11,989				12,057				17,220				12,740				12,724
Net interest income			39,416				39,310				38,140				37,554				37,114				31,957				36,829				36,487
Provision (benefit) for loan losses			664				(370	)			(516	)			(734	)			(3,192	)			(618	)			(1,092	)			(1,119	)
Other operating income			2,145				1,697				9,947				1,930				(576	)			7,123				1,986				1,710
Other operating expense			23,824				23,708				24,248				25,939				21,685				21,437				20,624				22,093
Income before income tax expense			17,073				17,669				24,355				14,279				18,045				18,261				19,283				17,223
Income tax expense			5,439				6,661				9,521				5,546				6,988				7,060				7,598				6,927
Net income		$	11,634			$	11,008			$	14,834			$	8,733			$	11,057			$	11,201			$	11,685			$	10,296


Basic earnings per common share		$	0.40			$	0.38			$	0.51			$	0.30			$	0.38			$	0.38			$	0.39			$	0.34
Diluted earnings per common share		$	0.40			$	0.38			$	0.51			$	0.30			$	0.38			$	0.38			$	0.39			$	0.34
Dividends per common share		$	0.16			$	0.16			$	0.16			$	0.16			$	0.15			$	0.15			$	0.15			$	0.15

Average common shares outstanding for:
Basic earnings per share			28,862				28,927				29,246				29,397				29,343				29,772				30,059				29,984
Diluted earnings per share			28,879				28,946				29,268				29,419				29,366				29,796				30,090				30,022