Note 6 - Investment Securities (Tables)

9 Months Ended

Sep. 30, 2013

Investments, Debt and Equity Securities [Abstract]

	September 30, 2013
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	(In thousands)
Securities Available-for-Sale
U.S. treasury securities	$	460,119	$	214	$	-	$	460,333
Mortgage-backed securities		1,131,602		9,364		45,947		1,095,019
Collateralized mortgage obligations		6,489		268		60		6,697
Asset-backed securities		127		1		-		128
Corporate debt securities		174,953		186		7,299		167,840
Mutual funds		6,000		-		188		5,812
Preferred stock of government sponsored entities		569		6,911		-		7,480
Total securities available-for-sale	$	1,779,859	$	16,944	$	53,494	$	1,743,309
Total investment securities	$	1,779,859	$	16,944	$	53,494	$	1,743,309

	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	$	460,141	$	460,355
Due after one year through five years		98,079		98,283
Due after five years through ten years		119,240		114,235
Due after ten years (1)		1,102,399		1,070,436
Total	$	1,779,859	$	1,743,309

	September 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
Mortgage-backed securities	$	882,851	$	45,944	$	154	$	2	$	883,005	$	45,946
Mortgage-backed securities-Non-agency		94		1		-		-		94		1
Collateralized mortgage obligations		68		1		332		59		400		60
Corporate debt securities		9,984		16		122,717		7,283		132,701		7,299
Mutual funds		5,812		188		-		-		5,812		188
Total securities available-for-sale	$	898,809	$	46,150	$	123,203	$	7,344	$	1,022,012	$	53,494
Total investment securities	$	898,809	$	46,150	$	123,203	$	7,344	$	1,022,012	$	53,494

	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 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