Note 2 - Securities (Tables)

6 Months Ended

Jun. 30, 2016

Notes Tables

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

(in thousands)	Amortized		Unrealized				Fair
June 30, 2016	cost		Gains		Losses		value
Government sponsored enterprise obligations	$	329,128	$	4,760	$	62	$	333,826
Mortgage-backed securities - government agencies		167,512		3,331		140		170,703
Obligations of states and political subdivisions		60,442		1,594		15		62,021
Corporate equity securities		653		104		-		757
Total securities available for sale	$	557,735	$	9,789	$	217	$	567,307
December 31, 2015
U.S. Treasury and other U.S. Government obligations	$	79,999	$	1	$	-	$	80,000
Government sponsored enterprise obligations		251,190		1,468		765		251,893
Mortgage-backed securities - government agencies		170,139		1,143		1,654		169,628
Obligations of states and political subdivisions		62,410		1,342		50		63,702
Corporate equity securities		653		-		-		653
Total securities available for sale	$	564,391	$	3,954	$	2,469	$	565,876

Investments Classified by Contractual Maturity Date [Table Text Block]

(in thousands)	Amortized cost		Fair value
Securities available-for-sale
Due within 1 year	$	134,681	$	134,811
Due after 1 but within 5 years		120,813		122,843
Due after 5 but within 10 years		21,231		21,724
Due after 10 years		112,845		116,469
Mortgage-backed securities		167,512		170,703
Corporate equity securities		653		757
Total securities available-for-sale	$	557,735	$	567,307

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, 2016	value		losses		value		losses		value		losses
Government sponsored enterprise obligations	$	109,829	$	34	$	3,842	$	28	$	113,671	$	62
Mortgage-backed securities - government agencies		1,343		2		18,589		138		19,932		140
Obligations of states and political subdivisions		2,556		8		1,338		7		3,894		15
Total temporarily impaired securities	$	113,728	$	44	$	23,769	$	173	$	137,497	$	217
December 31, 2015
Government sponsored enterprise obligations	$	102,098	$	500	$	8,469	$	265	$	110,567	$	765
Mortgage-backed securities - government agencies		49,774		662		29,936		992		79,710		1,654
Obligations of states and political subdivisions		13,225		31		1,955		19		15,180		50
Total temporarily impaired securities	$	165,097	$	1,193	$	40,360	$	1,276	$	205,457	$	2,469