Note 6 - Investment Securities (Tables)

6 Months Ended

Jun. 30, 2013

Investments, Debt and Equity Securities [Abstract]

	June 30, 2013
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	(In thousands)
Securities Available-for-Sale
U.S. treasury securities	$	409,849	$	192	$	6	$	410,035
Mortgage-backed securities		1,430,373		20,153		45,178		1,405,348
Collateralized mortgage obligations		7,438		295		65		7,668
Asset-backed securities		132		1		-		133
Corporate debt securities		189,951		415		7,540		182,826
Mutual funds		6,000		-		161		5,839
Preferred stock of government sponsored entities		569		5,887		-		6,456
Total securities available-for-sale	$	2,044,312	$	26,943	$	52,950	$	2,018,305
Total investment securities	$	2,044,312	$	26,943	$	52,950	$	2,018,305

	December 31, 2012
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	(In thousands)
Securities Held-to-Maturity
State and municipal securities	$	129,037	$	9,268	$	-	$	138,305
Mortgage-backed securities		634,757		40,801		-		675,558
Corporate debt securities		9,974		69		-		10,043
Total securities held-to-maturity	$	773,768	$	50,138	$	-	$	823,906
Securities Available-for-Sale
U.S. treasury securities	$	509,748	$	228	$	5	$	509,971
Mortgage-backed securities		404,505		12,194		5		416,694
Collateralized mortgage obligations		9,772		430		34		10,168
Asset-backed securities		145		-		4		141
Corporate debt securities		349,973		106		14,102		335,977
Mutual funds		6,000		79		-		6,079
Preferred stock of government sponsored entities		569		1,766		-		2,335
Trust preferred securities		9,964		151		-		10,115
Total securities available-for-sale	$	1,290,676	$	14,954	$	14,150	$	1,291,480
Total investment securities	$	2,064,444	$	65,092	$	14,150	$	2,115,386

	Securities available-for-sale
	Amortized cost		Fair value
	(In thousands)
Due in one year or less	$	309,963	$	310,155
Due after one year through five years		185,177		183,982
Due after five years through ten years		152,342		149,019
Due after ten years (1)		1,396,830		1,375,149
Total	$	2,044,312	$	2,018,305

	June 30, 2013
	Temporarily impaired securities
	Less than 12 months				12 months or longer				Total
	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
	(Dollars in thousands)
Securities Available-for-Sale
U.S. treasury securities	$	99,918	$	6	$	-	$	-	$	99,918	$	6
Mortgage-backed securities		901,227		45,174		160		2		901,387		45,176
Mortgage-backed securities-Non-agency		94		2		-		-		94		2
Collateralized mortgage obligations		67		2		332		63		399		65
Corporate debt securities		9,758		242		152,702		7,298		162,460		7,540
Mutual funds		5,839		161		-		-		5,839		161
Total securities available-for-sale	$	1,016,903	$	45,587	$	153,194	$	7,363	$	1,170,097	$	52,950
Total investment securities	$	1,016,903	$	45,587	$	153,194	$	7,363	$	1,170,097	$	52,950

	December 31, 2012
	Temporarily impaired securities
	Less than 12 months				12 months or longer				Total
	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
	(Dollars in thousands)
Securities Held-to-Maturity
Total securities held-to-maturity	$	-	$	-	$	-	$	-	$	-	$	-
Securities Available-for-Sale
U.S. treasury securities	$	49,969	$	5	$	-	$	-	$	49,969	$	5
Mortgage-backed securities		231		1		170		1		401		2
Mortgage-backed securities-Non-agency		-		-		96		2		96		2
Collateralized mortgage obligations		-		-		439		35		439		35
Asset-backed securities		-		-		141		4		141		4
Corporate debt securities		52,468		2,532		253,430		11,570		305,898		14,102
Total securities available-for-sale	$	102,668	$	2,538	$	254,276	$	11,612	$	356,944	$	14,150
Total investment securities	$	102,668	$	2,538	$	254,276	$	11,612	$	356,944	$	14,150