Note 7 - Investment Securities (Tables)

9 Months Ended

Sep. 30, 2018

Notes Tables

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

	September 30, 2018
			Gross		Gross
	Amortized		Unrealized		Unrealized
	Cost		Gains		Losses		Fair Value
	(In thousands)
Debt Securities Available-for-Sale
U.S. treasury securities	$	199,488	$	-	$	114	$	199,374
U.S. government agency entities		6,721		-		210		6,511
U.S. government sponsored entities		400,000		-		16,553		383,447
Mortgage-backed securities		648,532		130		22,023		626,639
Collateralized mortgage obligations		1,119		-		33		1,086
Corporate debt securities		64,983		1,020		-		66,003
Total	$	1,320,843	$	1,150	$	38,933	$	1,283,060

	December 31, 2017
			Gross		Gross
	Amortized		Unrealized		Unrealized
	Cost		Gains		Losses		Fair Value
	(In thousands)
Securities Available-for-Sale
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	$	1,336,345	$	13,965	$	16,684	$	1,333,626

Investments Classified by Contractual Maturity Date [Table Text Block]

	Securities Available-For-Sale
	Amortized cost		Fair value
	(In thousands)
Due in one year or less	$	199,497	$	199,383
Due after one year through five years		465,892		450,363
Due after five years through ten years		6,434		6,163
Due after ten years		649,020		627,151
Total	$	1,320,843	$	1,283,060

Schedule of Unrealized Loss on Investments [Table Text Block]

	September 30, 2018
	Temporarily impaired securities
	Less than 12 months				12 months or longer				Total
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
	Value		Losses		Value		Losses		Value		Losses
	(In thousands)
Debt Securities Available-for-Sale
U.S. treasury securities	$	199,374	$	114	$	-	$	-	$	199,374	$	114
U.S. government agency entities		5,208		160		1,304		50		6,512		210
U.S. government sponsored entities		-		-		383,447		16,553		383,447		16,553
Mortgage-backed securities		247,059		6,088		372,218		15,935		619,277		22,023
Collateralized mortgage obligations		-		-		1,086		33		1,086		33
Total debt securities	$	451,641	$	6,362	$	758,055	$	32,571	$	1,209,696	$	38,933
Equity Securities
Preferred stock of government sponsored entities		6,397		3,706		-		-		6,397		3,706
Mutual funds		-		-		6,034		195		6,034		195
Other equity securities		1,008		679		-		-		1,008		679
Total equity securities	$	7,405	$	4,385	$	6,034	$	195	$	13,439	$	4,580

	December 31, 2017
	Temporarily impaired securities
	Less than 12 months				12 months or longer				Total
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
	Value		Losses		Value		Losses		Value		Losses
	(In thousands)
Securities Available-for-Sale
U.S. treasury securities	$	199,823	$	62	$	49,697	$	295	$	249,520	$	357
U.S. government agency entities		5,711		70		-		-		5,711		70
U.S. government sponsored entities		-		-		390,336		9,664		390,336		9,664
State and municipal securities		1,914		30		-		-		1,914		30
Mortgage-backed securities		342,436		3,147		178,617		3,112		521,053		6,259
Collateralized mortgage obligations		1,516		17		-		-		1,516		17
Corporate debt securities		5,015		17		-		-		5,015		17
Mutual funds		-		-		6,230		270		6,230		270
Total	$	556,415	$	3,343	$	624,880	$	13,341	$	1,181,295	$	16,684