Note 2 - Securities (Tables)

9 Months Ended

Sep. 30, 2015

Investments, Debt and Equity Securities [Abstract]

Schedule of Available-for-sale Securities Reconciliation [Table Text Block]

(in thousands)	Amortized		Unrealized				Fair
September 30, 2015	cost		Gains		Losses		value
U.S. Treasury and other U.S. Government obligations	$	100,000	$	-	$	-	$	100,000
Government sponsored enterprise obligations		184,258		2,746		194		186,810
Mortgage-backed securities - government agencies		152,552		2,564		769		154,347
Obligations of states and political subdivisions		61,067		1,482		41		62,508
Corporate equity securities		756		-		55		701
Total securities available for sale	$	498,633	$	6,792	$	1,059	$	504,366
December 31, 2014
U.S. Treasury and other U.S. Government obligations	$	70,000	$	-	$	-	$	70,000
Government sponsored enterprise obligations		203,531		2,017		562		204,986
Mortgage-backed securities - government agencies		173,573		2,042		1,345		174,270
Obligations of states and political subdivisions		61,416		1,560		142		62,834
Corporate equity securities		756		210		-		966
Total securities available for sale	$	509,276	$	5,829	$	2,049	$	513,056

Investments Classified by Contractual Maturity Date [Table Text Block]

(in thousands)
Securities available-for-sale		Amortized cost		Fair value
Due within 1 year	$	125,176	$	125,348
Due after 1 but within 5 years		114,928		117,100
Due after 5 but within 10 years		15,694		15,992
Due after 10 years		89,527		90,878
Mortgage-backed securities		152,552		154,347
Corporate equity securities		756		701
Total securities available-for-sale	$	498,633	$	504,366

Schedule of Unrealized Loss on Investments [Table Text Block]

(in thousands)	Less than 12 months				12 months or more				Total
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
September 30, 2015	value		losses		value		losses		value		losses
Government sponsored enterprise obligations	$	6,353	$	8	$	8,740	$	186	$	15,093	$	194
Mortgage-backed securities - government agencies		12,929		129		31,734		640		44,663		769
Obligations of states and political subdivisions		7,817		25		2,232		16		10,049		41
Corporate equity securities		701		55		-		-		701		55
Total temporarily impaired securities	$	27,800	$	217	$	42,706	$	842	$	70,506	$	1,059
December 31, 2014
Government sponsored enterprise obligations	$	36,979	$	30	$	26,848	$	532	$	63,827	$	562
Mortgage-backed securities - government agencies		4,038		77		49,325		1,268		53,363		1,345
Obligations of states and political subdivisions		12,655		67		6,297		75		18,952		142
Total temporarily impaired securities	$	53,672	$	174	$	82,470	$	1,875	$	136,142	$	2,049