Note 2 - Securities (Tables)

3 Months Ended

Mar. 31, 2017

Notes Tables

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

(in thousands)	Amortized		Unrealized				Fair
March 31, 2017	cost		Gains		Losses		value
Government sponsored enterprise obligations	$	340,122	$	900	$	1,076	$	339,946
Mortgage-backed securities - government agencies		161,867		728		2,037		160,558
Obligations of states and political subdivisions		54,305		757		198		54,864
Corporate equity securities		653		123		-		776
Total securities available for sale	$	556,947	$	2,508	$	3,311	$	556,144
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	$	183,351	$	183,438
Due after 1 but within 5 years		90,361		90,658
Due after 5 but within 10 years		16,240		16,090
Due after 10 years		104,475		104,624
Mortgage-backed securities – government agencies		161,867		160,558
Corporate equity securities		653		776
Total securities available-for-sale	$	556,947	$	556,144

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, 2017	value		losses		value		losses		value		losses
Government sponsored enterprise obligations	$	111,725	$	883	$	12,887	$	193	$	124,612	$	1,076
Mortgage-backed securities - government agencies		97,143		1,699		9,431		338		106,574		2,037
Obligations of states and political subdivisions		19,096		174		2,537		24		21,633		198
Total temporarily impaired securities	$	227,964	$	2,756	$	24,855	$	555	$	252,819	$	3,311
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