Note 3 - Investment Securities (Tables)

9 Months Ended

Sep. 30, 2014

Investments, Debt and Equity Securities [Abstract]

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

	Investment Securities Available for Sale At September 30, 2014
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(In thousands)
U.S. Treasury securities	$	3,499	$	10	$	-		$	3,509
Securities of U.S. Government sponsored entities		442,482		214		(1,160	)		441,536
Residential mortgage-backed securities		26,574		1,799		(20	)		28,353
Commercial mortgage-backed securities		3,021		7		(7	)		3,021
Obligations of states and political subdivisions		176,614		10,203		(197	)		186,620
Residential collateralized mortgage obligations		240,091		594		(11,400	)		229,285
Asset-backed securities		8,674		-		(35	)		8,639
FHLMC(1) and FNMA(2) stock		804		13,798		-			14,602
Corporate securities		470,570		3,674		(1,106	)		473,138
Other securities		2,039		756		(136	)		2,659
Total	$	1,374,368	$	31,055	$	(14,061	)	$	1,391,362

	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

Schedule of Held to Maturity Securities Reconciliation [Table Text Block]

	Investment Securities Held to Maturity At September 30, 2014
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(In thousands)
Securities of U.S. Government sponsored entities	$	1,164	$	-	$	-		$	1,164
Residential mortgage-backed securities		59,182		926		(86	)		60,022
Obligations of states and political subdivisions		703,554		11,483		(2,909	)		712,128
Residential collateralized mortgage obligations		271,141		1,673		(4,743	)		268,071
Total	$	1,035,041	$	14,082	$	(7,738	)	$	1,041,385

	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

Investments Classified by Contractual Maturity Date [Table Text Block]

	At September 30, 2014
	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	$	45,444	$	45,671	$	13,767	$	14,233
Over 1 to 5 years		625,789		629,181		216,979		220,062
Over 5 to 10 years		362,884		366,119		270,071		273,124
Over 10 years		67,722		72,471		203,901		205,873
Subtotal		1,101,839		1,113,442		704,718		713,292
Mortgage-backed securities and residential collateralized mortgage obligations		269,686		260,659		330,323		328,093
Other securities		2,843		17,261		-		-
Total	$	1,374,368	$	1,391,362	$	1,035,041	$	1,041,385

	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

Schedule of Unrealized Loss on Investments [Table Text Block]

	Investment Securities Available for Sale At September 30, 2014
	No. of		Less than 12 months					No. of		12 months or longer					No. of		Total
	Investment				Unrealized			Investment				Unrealized			Investment				Unrealized
	Positions		Fair Value		Losses			Positions		Fair Value		Losses			Positions		Fair Value		Losses
	($ in thousands)
Securities of U.S. Government sponsored entities		24	$	358,842	$	(1,103	)		1	$	9,943	$	(57	)		25	$	368,785	$	(1,160	)
Residential mortgage-backed securities		-		-		-			2		828		(20	)		2		828		(20	)
Commercial mortgage-backed securities		-		-		-			2		1,822		(7	)		2		1,822		(7	)
Obligations of states and political subdivisions		8		2,783		(46	)		21		6,460		(151	)		29		9,243		(197	)
Residential collateralized mortgage obligations		-		-		-			38		209,504		(11,400	)		38		209,504		(11,400	)
Asset-backed securities		1		5,030		(1	)		1		3,609		(34	)		2		8,639		(35	)
Corporate securities		31		93,716		(772	)		5		34,218		(334	)		36		127,934		(1,106	)
Other securities		-		-		-			1		1,864		(136	)		1		1,864		(136	)
Total		64	$	460,371	$	(1,922	)		71	$	268,248	$	(12,139	)		135	$	728,619	$	(14,061	)

	Investment Securities Held to Maturity At September 30, 2014
	No. of		Less than 12 months					No. of		12 months or longer					No. of		Total
	Investment				Unrealized			Investment				Unrealized			Investment				Unrealized
	Positions		Fair Value		Losses			Positions		Fair Value		Losses			Positions		Fair Value		Losses
	($ in thousands)
Securities of U.S. Government sponsored entities		1	$	1,164	$	-			-	$	-	$	-			1	$	1,164	$	-
Residential  mortgage-backed securities		2		9,658		(48	)		2		3,320		(38	)		4		12,978		(86	)
Obligations of states and political subdivisions		14		10,434		(45	)		180		162,095		(2,864	)		194		172,529		(2,909	)
Residential collateralized mortgage obligations		15		63,098		(787	)		23		132,175		(3,956	)		38		195,273		(4,743	)
Total		32	$	84,354	$	(880	)		205	$	297,590	$	(6,858	)		237	$	381,944	$	(7,738	)

	Investment Securities Available for Sale At December 31, 2013
	No. of		Less than 12 months					No. of		12 months or longer					No. of		Total
	Investment				Unrealized			Investment				Unrealized			Investment				Unrealized
	Positions		Fair Value		Losses			Positions		Fair Value		Losses			Positions		Fair Value		Losses
	($ in thousands)
U.S. Treasury securities		1	$	2,994	$	(3	)		-	$	-	$	-			1	$	2,994	$	(3	)
Securities of U.S. Government sponsored entities		15		91,669		(663	)		-		-		-			15		91,669		(663	)
Residential mortgage-backed securities		3		864		(15	)		-		-		-			3		864		(15	)
Commercial mortgage-backed securities		1		1,072		(5	)		-		-		-			1		1,072		(5	)
Obligations of states and political subdivisions		35		17,516		(222	)		11		3,214		(101	)		46		20,730		(323	)
Residential collateralized mortgage obligations		34		187,848		(12,326	)		6		40,575		(2,398	)		40		228,423		(14,724	)
Asset-backed securities		1		5,002		(1	)		1		4,475		(100	)		2		9,477		(101	)
Corporate securities		25		117,751		(1,087	)		2		9,824		(177	)		27		127,575		(1,264	)
Other securities		-		-		-			1		1,842		(158	)		1		1,842		(158	)
Total		115	$	424,716	$	(14,322	)		21	$	59,930	$	(2,934	)		136	$	484,646	$	(17,256	)

	Investment Securities Held to Maturity At December 31, 2013
	No. of		Less than 12 months					No. of		12 months or longer					No. of		Total
	Investment				Unrealized			Investment				Unrealized			Investment				Unrealized
	Positions		Fair Value		Losses			Positions		Fair Value		Losses			Positions		Fair Value		Losses
	($ in thousands)
Securities of U.S. Government sponsored entities		1	$	1,597	$	(4	)		-	$	-	$	-			1	$	1,597	$	(4	)
Residential  mortgage-backed securities		13		38,396		(616	)		1		392		(8	)		14		38,788		(624	)
Obligations of states and political subdivisions		530		355,797		(14,893	)		64		64,427		(6,774	)		594		420,224		(21,667	)
Residential collateralized mortgage obligations		42		214,981		(5,175	)		5		14,120		(427	)		47		229,101		(5,602	)
Total		586	$	610,771	$	(20,688	)		70	$	78,939	$	(7,209	)		656	$	689,710	$	(27,897	)

Interest Income From Investments [Table Text Block]

	For the Three Months				For the Nine Months
	Ended September 30,
	2014		2013		2014		2013
	(In thousands)
Taxable	$	6,348	$	5,502	$	17,907	$	16,626
Tax-exempt		6,423		7,338		20,143		22,368
Total interest income from investment securities	$	12,771	$	12,840	$	38,050	$	38,994