Note 2 - Securities (Tables)

6 Months Ended

Jun. 30, 2017

Notes Tables

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

(in thousands)	Amortized		Unrealized				Fair
June 30, 2017	cost		Gains		Losses		value
Government sponsored enterprise obligations	$	366,762	$	789	$	873	$	366,678
Mortgage-backed securities - government agencies		155,933		709		1,768		154,874
Obligations of states and political subdivisions		53,428		710		102		54,036
Corporate equity securities		653		50		-		703
Total securities available for sale	$	576,776	$	2,258	$	2,743	$	576,291
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	$	222,639	$	222,690
Due after 1 but within 5 years		80,328		80,586
Due after 5 but within 10 years		15,689		15,626
Due after 10 years		101,534		101,812
Mortgage-backed securities – government agencies		155,933		154,874
Corporate equity securities		653		703
Total securities available-for-sale	$	576,776	$	576,291

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
June 30, 2017	value		losses		value		losses		value		losses
Government sponsored enterprise obligations	$	185,503	$	663	$	37,819	$	210	$	223,322	$	873
Mortgage-backed securities - government agencies		87,161		1,383		9,952		385		97,113		1,768
Obligations of states and political subdivisions		12,948		68		2,853		34		15,801		102
Total temporarily impaired securities	$	285,612	$	2,114	$	50,624	$	629	$	336,236	$	2,743
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