Note 3 - Investment Securities (Tables)

6 Months Ended

Jun. 30, 2013

Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]

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

	Investment Securities Available for Sale At June 30, 2013
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(In thousands)
U.S. Treasury securities	$	3,511	$	23	$	-		$	3,534
Securities of U.S. Government sponsored entities		38,699		49		(367	)		38,381
Residential mortgage-backed securities		39,532		2,089		(11	)		41,610
Commercial mortgage-backed securities		3,716		73		-			3,789
Obligations of States and political subdivisions		191,367		7,338		(278	)		198,427
Residential collateralized mortgage obligations		285,670		918		(8,790	)		277,798
Asset-backed securities		15,328		-		(125	)		15,203
FHLMC (1) and FNMA (2) stock		824		7,204		-			8,028
Corporate securities		416,108		2,279		(3,074	)		415,313
Other securities		2,049		888		(132	)		2,805
Total	$	996,804	$	20,861	$	(12,777	)	$	1,004,888

	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

Schedule Of Held To Maturity Securities Reconciliation [Table Text Block]

	Investment Securities Held to Maturity At June 30, 2013
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(In thousands)
Securities of U.S. Government sponsored entities	$	2,256	$	10	$	-		$	2,266
Residential mortgage-backed securities		64,404		986		(488	)		64,902
Obligations of States and political subdivisions		723,096		9,146		(18,155	)		714,087
Residential collateralized mortgage obligations		344,859		1,459		(2,627	)		343,691
Total	$	1,134,615	$	11,601	$	(21,270	)	$	1,124,946

	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 June 30, 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	$	69,203	$	69,604	$	11,182	$	11,441
Over 1 to 5 years		426,099		425,485		162,937		166,079
Over 5 to 10 years		71,015		72,718		282,150		281,073
Over 10 years		98,696		103,051		269,083		257,760
Subtotal		665,013		670,858		725,352		716,353
Mortgage-backed securities and residential collateralized mortgage obligations		328,918		323,197		409,263		408,593
Other securities		2,873		10,833		-		-
Total	$	996,804	$	1,004,888	$	1,134,615	$	1,124,946

	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 June 30, 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	$	24,507	$	(367	)	$	-	$	-		$	24,507	$	(367	)
Residential mortgage-backed securities		18		-			868		(11	)		886		(11	)
Obligations of States and political subdivisions		9,893		(141	)		5,756		(137	)		15,649		(278	)
Residential collateralized mortgage obligations		250,865		(8,790	)		1		-			250,866		(8,790	)
Asset-backed securities		10,108		(10	)		5,095		(115	)		15,203		(125	)
Corporate securities		218,697		(2,715	)		32,548		(359	)		251,245		(3,074	)
Other securities		-		-			1,868		(132	)		1,868		(132	)
Total	$	514,088	$	(12,023	)	$	46,136	$	(754	)	$	560,224	$	(12,777	)

	Investment Securities Held to Maturity At June 30, 2013
	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	$	33,116	$	(360	)	$	7,561	$	(128	)	$	40,677	$	(488	)
Obligations of States and political subdivisions		338,807		(17,765	)		9,307		(390	)		348,114		(18,155	)
Residential collateralized mortgage obligations		208,216		(2,360	)		16,418		(267	)		224,634		(2,627	)
Total	$	580,139	$	(20,485	)	$	33,286	$	(785	)	$	613,425	$	(21,270	)

	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	)
Residential collateralized mortgage obligations		72,803		(294	)		-		-			72,803		(294	)
Obligations of States and political subdivisions		2,080		(23	)		8,928		(229	)		11,008		(252	)
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	)
Residential collateralized mortgage obligations		26,683		(386	)		9,353		(175	)		36,036		(561	)
Obligations of States and political subdivisions		69,839		(1,205	)		4,275		(30	)		74,114		(1,235	)
Total	$	96,635	$	(1,591	)	$	14,292	$	(215	)	$	110,927	$	(1,806	)

Interest Income From Investments [Table Text Block]

	For the Three Months				For the Six Months
	Ended June 30,
	2013		2012		2013		2012
	(In thousands)
Taxable:
Mortgage related securities	$	3,371	$	3,713	$	6,933	$	7,076
Other		2,220		1,635		4,192		2,962
Total taxable		5,591		5,348		11,125		10,038
Tax-exempt		7,498		7,808		15,030		15,760
Total interest income from investment securities	$	13,089	$	13,156	$	26,155	$	25,798