Note 4 - Investment Securities (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

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

	As of December 31, 201 7
			Gros s		Gros s
	Amortize d		Unrealize d		Unrealize d
	Cos t		Gain s		Losse s		Fair Valu e
	(In thousands )
Securities Available-for-Sal e
U.S. treasury securities	$	249,877	$	-	$	357	$	249,520
U.S. government agency entities		9,047		11		70		8,988
U.S. government sponsored entities		400,000		-		9,664		390,336
State and municipal securities		1,944				30		1,914
Mortgage-backed securities		577,987		241		6,259		571,969
Collateralized mortgage obligations		1,533		-		17		1,516
Corporate debt securities		80,007		1,291		17		81,281
Mutual funds		6,500		-		270		6,230
Preferred stock of government sponsored entities		5,842		4,260		-		10,102
Other equity securities		3,608		8,162		-		11,770
Total securities available-for-sale	$	1,336,345	$	13,965	$	16,684	$	1,333,626

	As of December 31, 201 6
			Gros s		Gros s
	Amortize d		Unrealize d		Unrealize d
	Cos t		Gain s		Losse s		Fair Valu e
	(In thousands )
Securities Available-for-Sal e
U.S. treasury securities	$	489,839	$	35	$	857	$	489,017
U.S. government sponsored entities		400,000		-		9,669		390,331
Mortgage-backed securities		339,241		309		3,290		336,260
Collateralized mortgage obligations		48		-		20		28
Corporate debt securities		74,965		247		862		74,350
Mutual funds		6,500		-		270		6,230
Preferred stock of government sponsored entities		2,811		4,497		-		7,308
Other equity securities		3,608		7,213		-		10,821
Total securities available-for-sale	$	1,317,012	$	12,301	$	14,968	$	1,314,345

Investments Classified by Contractual Maturity Date [Table Text Block]

	Securities Available-for-Sal e
	Amortized Cos t		Fair Valu e
	(In thousands )
Due in one year or less	$	265,550	$	265,231
Due after one year through five years		465,195		456,804
Due after five years through ten years		8,056		7,962
Due after ten years (1)		597,544		603,629
Total	$	1,336,345	$	1,333,626

Schedule of Unrealized Loss on Investments [Table Text Block]

	As of December 31, 201 7
	Temporarily Impaired Securitie s
	Less than 12 month s						12 months or longe r						Tota l
	Fai r		Unrealized		No. of		Fai r		Unrealized		No. o f		Fai r		Unrealized		No. of
	Valu e		Losse s		Issuances		Valu e		Losse s		Issuance s		Valu e		Losse s		Issuances
	(Dollars in thousands )
Securities Available-for-Sal e
U.S. treasury securities	$	199,823	$	62		4	$	49,697	$	295		2	$	249,520	$	357		6
U.S. government agency entities		5,711		70		3		-		-		-		5,711		70		3
U.S. government sponsored entities		-		-		-		390,336		9,664		8		390,336		9,664		8
State and municipal securities		1,914		30		2		-		-		-		1,914		30		2
Mortgage-backed securities		342,436		3,147		48		178,617		3,112		13		521,053		6,259		61
Collateralized mortgage obligations		1,516		17		5		-		-		-		1,516		17		5
Corporate debt securities		5,015		17		1		-		-		-		5,015		17		1
Mutual funds		-		-		-		6,230		270		1		6,230		270		1
Total securities available-for-sale	$	556,415	$	3,343		63	$	624,880	$	13,341		24	$	1,181,295	$	16,684		87

	As of December 31, 201 6
	Temporarily Impaired Securitie s
	Less than 12 month s						12 months or longe r						Tota l
	Fai r		Unrealized		No. of		Fai r		Unrealized		No. o f		Fai r		Unrealized		No. of
	Valu e		Losse s		Issuances		Valu e		Losse s		Issuance s		Valu e		Losse s		Issuances
	(Dollars in thousands )
Securities Available-for-Sal e
U.S. treasury securities	$	299,088	$	857		6	$	-	$	-		-	$	299,088	$	857		6
U.S. government sponsored entities		390,331		9,669		8		-		-		-		390,331		9,669		8
Mortgage-backed securities		328,236		3,288		16		62		2		3		328,298		3,290		19
Collateralized mortgage obligations		-		-		-		28		20		1		28		20		1
Corporate debt securities		-		-		-		29,138		862		2		29,138		862		2
Mutual funds		-		-		-		6,230		270		1		6,230		270		1
Total securities available-for-sale	$	1,017,655	$	13,814		30	$	35,458	$	1,154		7	$	1,053,113	$	14,968		37