Note 3 - Investment Securities (Tables)

12 Months Ended

Dec. 31, 2015

Investments, Debt and Equity Securities [Abstract]

Schedule of AFS and HTM Reconciliation [Table Text Block]

December 31, 2015 (In thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Available For Sale
Obligations of U.S. government-sponsored entities	$	107,135	$	309	$	538	$	106,906
Obligations of states and political subdivisions		147,875		2,604		213		150,266
Mortgage-backed securities – residential		294,140		5,210		1,489		297,861
Mortgage-backed securities – commercial		20,655		52		123		20,584
Corporate debt securities		6,629		11		800		5,840
Mutual funds and equity securities		814		-		69		745
Total securities – available for sale	$	577,248	$	8,186	$	3,232	$	582,202
Held To Maturity
Obligations of states and political subdivisions	$	3,611	$	198	$	-	$	3,809

December 31, 2014 (In thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Available For Sale
Obligations of U.S. government-sponsored entities	$	110,094	$	369	$	1,015	$	109,448
Obligations of states and political subdivisions		133,563		2,600		397		135,766
Mortgage-backed securities – residential		363,729		7,959		1,199		370,489
Mortgage-backed securities – commercial		2,515		7		10		2,512
Corporate debt securities		6,639		26		358		6,307
Mutual funds and equity securities		1,889		2		25		1,866
Total securities – available for sale	$	618,429	$	10,963	$	3,004	$	626,388
Held To Maturity
Obligations of states and political subdivisions	$	3,728	$	195	$	-	$	3,923

Investments Classified by Contractual Maturity Date [Table Text Block]

	Available For Sale				Held To Maturity
December 31, 2015 (In thousands)	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Due in one year or less	$	13,411	$	13,440	$	-	$	-
Due after one year through five years		156,691		157,582		-		-
Due after five years through ten years		76,384		77,491		640		732
Due after ten years		15,153		14,499		2,971		3,077
Mortgage-backed securities		314,795		318,445		-		-
Total	$	576,434	$	581,457	$	3,611	$	3,809

Realized Gain (Loss) on Investments [Table Text Block]

(In thousands)	2015			2014			2013
Gross realized gains	$	224		$	190		$	14
Gross realized losses		(53	)		253			64
Net realized gain (loss)	$	171		$	(63	)	$	(50	)
Income tax provision (benefit) related to net realized gain (loss)	$	60		$	(22	)	$	(18	)

Schedule of Unrealized Loss on Investments [Table Text Block]

	Less than 12 Months				12 Months or More				Total
December 31, 2015 (In thousands)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Obligations of U.S. government-sponsored entities	$	57,927	$	275	$	21,576	$	263	$	79,503	$	538
Obligations of states and political subdivisions		30,426		123		8,276		90		38,702		213
Mortgage-backed securities – residential		118,978		851		21,723		638		140,701		1,489
Mortgage-backed securities – commercial		10,882		123		-		-		10,882		123
Corporate debt securities		204		6		5,155		794		5,359		800
Mutual funds and equity securities		481		21		264		48		745		69
Total	$	218,898	$	1,399	$	56,994	$	1,833	$	275,892	$	3,232

	Less than 12 Months				12 Months or More				Total
December 31, 2014 (In thousands)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Obligations of U.S. government-sponsored entities	$	22,696	$	76	$	60,892	$	939	$	83,588	$	1,015
Obligations of states and political subdivisions		20,746		81		21,272		316		42,018		397
Mortgage-backed securities – residential		37,451		82		71,311		1,117		108,762		1,199
Mortgage-backed securities – commercial		-		-		723		10		723		10
Corporate debt securities		76		4		5,525		354		5,601		358
Mutual funds and equity securities		305		11		95		14		400		25
Total	$	81,274	$	254	$	159,818	$	2,750	$	241,092	$	3,004