Note 2 - Securities (Tables)

3 Months Ended

Mar. 31, 2018

Notes Tables

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

(In thousands)	Amortized		Unrealized
March 31, 2018	cost		Gains		Losses			Fair value
Government sponsored enterprise obligations	$	405,684	$	100	$	(3,373	)	$	402,411
Mortgage-backed securities - government agencies		156,045		155		(4,452	)		151,748
Obligations of states and political subdivisions		43,941		260		(279	)		43,922
Total securities available for sale	$	605,670	$	515	$	(8,104	)	$	598,081
December 31, 2017
U.S. Treasury and other U.S. Government obligations	$	149,996	$	-	$	(12	)	$	149,984
Government sponsored enterprise obligations		214,852		474		(1,482	)		213,844
Mortgage-backed securities - government agencies		163,571		383		(2,447	)		161,507
Obligations of states and political subdivisions		48,987		365		(163	)		49,189
Total securities available for sale	$	577,406	$	1,222	$	(4,104	)	$	574,524

Investments Classified by Contractual Maturity Date [Table Text Block]

(In thousands)
Securities available-for-sale	Amortized cost		Fair value
Due within 1 year	$	230,740	$	230,686
Due after 1 but within 5 years		97,419		96,063
Due after 5 but within 10 years		10,058		9,808
Due after 10 years		111,408		109,776
Mortgage-backed securities – government agencies		156,045		151,748
Total securities available-for-sale	$	605,670	$	598,081

Schedule of Unrealized Loss on Investments [Table Text Block]

(In thousands)	Less than 12 months					12 months or more					Total
	Fair		Unrealized			Fair		Unrealized			Fair		Unrealized
March 31, 2018	value		losses			value		losses			value		losses
Government sponsored enterprise obligations	$	340,018	$	(2,188	)	$	48,470	$	(1,185	)	$	388,488	$	(3,373	)
Mortgage-backed securities - government agencies		75,107		(1,669	)		63,083		(2,783	)		138,190		(4,452	)
Obligations of states and political subdivisions		19,582		(192	)		5,242		(87	)		24,824		(279	)
Total temporarily impaired securities	$	434,707	$	(4,049	)	$	116,795	$	(4,055	)	$	551,502	$	(8,104	)
December 31, 2017
U.S. Treasury and U.S. obligations	$	149,984	$	(12	)	$	-	$	-		$	149,984	$	(12	)
Government sponsored enterprise obligations		95,139		(586	)		49,870		(896	)		145,009		(1,482	)
Mortgage-backed securities - government agencies		69,290		(440	)		67,047		(2,007	)		136,337		(2,447	)
Obligations of states and political subdivisions		22,366		(107	)		5,064		(56	)		27,430		(163	)
Total temporarily impaired securities	$	336,779	$	(1,145	)	$	121,981	$	(2,959	)	$	458,760	$	(4,104	)