Note 2 - Investment Securities (Tables)

12 Months Ended

Dec. 31, 2013

Investments, Debt and Equity Securities [Abstract]

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

	Investment Securities Available for Sale At December 31, 2013
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(In thousands)
U.S. Treasury securities	$	3,500	$	9	$	(3	)	$	3,506
Securities of U.S. Government sponsored entities		131,080		75		(663	)		130,492
Residential mortgage-backed securities		32,428		1,763		(15	)		34,176
Commercial mortgage-backed securities		3,411		19		(5	)		3,425
Obligations of states and political subdivisions		186,082		5,627		(323	)		191,386
Residential collateralized mortgage obligations		266,890		730		(14,724	)		252,896
Asset-backed securities		14,653		3		(101	)		14,555
FHLMC and FNMA stock		804		12,568		—			13,372
Corporate securities		430,794		2,901		(1,264	)		432,431
Other securities		2,049		1,251		(158	)		3,142
Total	$	1,071,691	$	24,946	$	(17,256	)	$	1,079,381

	Investment Securities Available for Sale At December 31, 2012
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(In thousands)
U.S. Treasury securities	$	3,520	$	38	$	—		$	3,558
Securities of U.S. Government sponsored entities		49,335		207		(17	)		49,525
Residential mortgage-backed securities		53,078		3,855		(1	)		56,932
Commercial mortgage-backed securities		4,076		69		—			4,145
Obligations of states and political subdivisions		200,769		14,730		(252	)		215,247
Residential collateralized mortgage obligations		219,613		1,786		(294	)		221,105
Asset-backed securities		16,130		18		(143	)		16,005
FHLMC and FNMA stock		824		2,061		(5	)		2,880
Corporate securities		250,655		3,009		(826	)		252,838
Other securities		2,091		1,370		(60	)		3,401
Total	$	800,091	$	27,143	$	(1,598	)	$	825,636

	Investment Securities Held to Maturity At December 31, 2013
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(In thousands)
Securities of U.S. Government sponsored entities	$	1,601	$	—	$	(4	)	$	1,597
Residential mortgage-backed securities		65,076		854		(624	)		65,306
Obligations of states and political subdivisions		756,707		6,211		(21,667	)		741,251
Residential collateralized mortgage obligations		308,915		1,209		(5,602	)		304,522
Total	$	1,132,299	$	8,274	$	(27,897	)	$	1,112,676

	Investment Securities Held to Maturity At December 31, 2012
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(In thousands)
Securities of U.S. Government sponsored entities	$	3,232	$	43	$	—		$	3,275
Residential mortgage-backed securities		72,807		2,090		(10	)		74,887
Obligations of states and political subdivisions		680,802		23,004		(1,235	)		702,571
Residential collateralized mortgage obligations		399,200		5,185		(561	)		403,824
Total	$	1,156,041	$	30,322	$	(1,806	)	$	1,184,557

Investments Classified by Contractual Maturity Date [Table Text Block]

	At December 31, 2013
	Securities Available for Sale				Securities Held to Maturity
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
	(In thousands)
Maturity in years:
1 year or less	$	75,385	$	75,609	$	9,639	$	9,900
Over 1 to 5 years		536,333		538,111		187,051		189,827
Over 5 to 10 years		66,669		68,166		314,630		310,104
Over 10 years		87,722		90,484		246,988		233,017
Subtotal		766,109		772,370		758,308		742,848
Mortgage-backed securities and residential collateralized mortgage obligations		302,729		290,497		373,991		369,828
Other securities		2,853		16,514		—		—
Total	$	1,071,691	$	1,079,381	$	1,132,299	$	1,112,676

	At December 31, 2012
	Securities Available for Sale				Securities Held to Maturity
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
	(In thousands)
Maturity in years:
1 year or less	$	40,380	$	40,686	$	10,265	$	10,496
Over 1 to 5 years		309,293		312,480		167,162		171,769
Over 5 to 10 years		59,817		63,540		227,603		236,608
Over 10 years		110,919		120,467		279,004		286,973
Subtotal		520,409		537,173		684,034		705,846
Mortgage-backed securities and residential collateralized mortgage obligations		276,767		282,182		472,007		478,711
Other securities		2,915		6,281		—		—
Total	$	800,091	$	825,636	$	1,156,041	$	1,184,557

Schedule of Unrealized Loss on Investments [Table Text Block]

	Investment Securities Available for Sale At December 31, 2013
	Less than 12 months					12 months or longer					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
	(In thousands)
U.S. Treasury securities	$	2,994	$	(3	)	$	—	$	—		$	2,994	$	(3	)
Securities of U.S. Government sponsored entities		91,669		(663	)		—		—			91,669		(663	)
Residential mortgage-backed securities		864		(15	)		—		—			864		(15	)
Commercial mortgage-backed securities		1,072		(5	)		—		—			1,072		(5	)
Obligations of states and political subdivisions		17,516		(222	)		3,214		(101	)		20,730		(323	)
Residential collateralized mortgage obligations		187,848		(12,326	)		40,575		(2,398	)		228,423		(14,724	)
Asset-backed securities		5,002		(1	)		4,475		(100	)		9,477		(101	)
Corporate securities		117,751		(1,087	)		9,824		(177	)		127,575		(1,264	)
Other securities		—		—			1,842		(158	)		1,842		(158	)
Total	$	424,716	$	(14,322	)	$	59,930	$	(2,934	)	$	484,646	$	(17,256	)

	Investment Securities Held to Maturity At December 31, 2013
	Less than 12 months					12 months or longer					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
	(In thousands)
Securities of U.S. Government sponsored entities	$	1,597	$	(4	)	$	—	$	—		$	1,597	$	(4	)
Residential  mortgage-backed securities		38,396		(616	)		392		(8	)		38,788		(624	)
Obligations of states and political subdivisions		355,797		(14,893	)		64,427		(6,774	)		420,224		(21,667	)
Residential collateralized mortgage obligations		214,981		(5,175	)		14,120		(427	)		229,101		(5,602	)
Total	$	610,771	$	(20,688	)	$	78,939	$	(7,209	)	$	689,710	$	(27,897	)

	Investment Securities Available for Sale At December 31, 2012
	Less than 12 months					12 months or longer					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
	(In thousands)
Securities of U.S. Government sponsored entities	$	9,983	$	(17	)	$	––	$	––		$	9,983	$	(17	)
Residential mortgage-backed securities		103		(1	)		11		––			114		(1	)
Obligations of states and political subdivisions		2,080		(23	)		8,928		(229	)		11,008		(252	)
Residential collateralized mortgage obligations		72,803		(294	)		––		––			72,803		(294	)
Asset-backed securities		—		—			5,828		(143	)		5,828		(143	)
FHLMC and FNMA stock		—		—			1		(5	)		1		(5	)
Corporate securities		53,570		(423	)		24,597		(403	)		78,167		(826	)
Other securities		—		—			1,940		(60	)		1,940		(60	)
Total	$	138,539	$	(758	)	$	41,305	$	(840	)	$	179,844	$	(1,598	)

	Investment Securities Held to Maturity At December 31, 2012
	Less than 12 months					12 months or longer					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
	(In thousands)
Residential  mortgage-backed securities	$	113	$	—		$	664	$	(10	)	$	777	$	(10	)
Obligations of states and political subdivisions		69,839		(1,205	)		4,275		(30	)		74,114		(1,235	)
Residential collateralized mortgage obligations		26,683		(386	)		9,353		(175	)		36,036		(561	)
Total	$	96,635	$	(1,591	)	$	14,292	$	(215	)	$	110,927	$	(1,806	)

	For the Year Ended December 31,
	2013		2012		2011
	(In thousands)
Taxable:
Mortgage related securities	$	13,291	$	14,696	$	11,834
Other		8,910		6,650		5,570
Total fully taxable		22,201		21,346		17,404
Tax-exempt from regular federal income tax		29,569		31,198		29,902
Total interest income from investment securities	$	51,770	$	52,544	$	47,306