Note 2 - Securities (Tables)

9 Months Ended

Sep. 30, 2017

Notes Tables

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

(in thousands)	Amortized		Unrealized
September 30, 2017	cost		Gains		Losses		Fair value
Government sponsored enterprise obligations	$	372,596	$	846	$	778	$	372,664
Mortgage-backed securities - government agencies		147,604		697		1,581		146,720
Obligations of states and political subdivisions		51,100		611		89		51,622
Corporate equity securities		653		-		137		516
Total securities available for sale	$	571,953	$	2,154	$	2,585	$	571,522
December 31, 2016
U.S. Treasury and other U.S. Government obligations	$	74,997	$	1	$	-	$	74,998
Government sponsored enterprise obligations		268,784		800		1,494		268,090
Mortgage-backed securities - government agencies		170,344		735		2,236		168,843
Obligations of states and political subdivisions		57,158		682		396		57,444
Corporate equity securities		653		46		-		699
Total securities available for sale	$	571,936	$	2,264	$	4,126	$	570,074

Investments Classified by Contractual Maturity Date [Table Text Block]

(in thousands)
Securities available-for-sale	Amortized cost		Fair value
Due within 1 year	$	216,651	$	216,696
Due after 1 but within 5 years		74,383		74,529
Due after 5 but within 10 years		14,085		14,031
Due after 10 years		118,577		119,030
Mortgage-backed securities  - government agencies		147,604		146,720
Corporate equity securities		653		516
Total securities available-for-sale	$	571,953	$	571,522

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
September 30, 2017	value		losses		value		losses		value		losses
Government sponsored enterprise obligations	$	190,462	$	135	$	70,176	$	643	$	260,638	$	778
Mortgage-backed securities - government agencies		13,227		117		65,781		1,464		79,008		1,581
Obligations of states and political subdivisions		9,307		13		6,287		76		15,594		89
Corporate equity securities		516		137		-		-		516		137
Total temporarily impaired securities	$	213,512	$	402	$	142,244	$	2,183	$	355,756	$	2,585
December 31, 2016
Government sponsored enterprise obligations	$	154,951	$	1,344	$	3,485	$	150	$	158,436	$	1,494
Mortgage-backed securities - government agencies		115,374		1,873		9,914		363		125,288		2,236
Obligations of states and political subdivisions		29,893		380		1,478		16		31,371		396
Total temporarily impaired securities	$	300,218	$	3,597	$	14,877	$	529	$	315,095	$	4,126