Note 4 - Securities (Tables)

6 Months Ended

Jun. 30, 2017

Notes Tables

Available-for-sale Securities [Table Text Block]

	June 30 , 2017
	Amortized Costs		Gross Unrealized Gains		Gross Unrealized Losses		Fair Values
Available for S ale:
U.S. Government agencies and corporations	$	294,602	$	1,006	$	2,832	$	292,776
State s and political subdivisions		8,283		159		---		8,442
Mortgage-backed securities		711		72		---		783
Corporate debt securities		6,015		255		28		6,242
Other securities		189		3		---		192
Total securities available for sale	$	309,800	$	1,495	$	2,860	$	308,435

	December 31, 201 6
	Amortized Costs		Gross Unrealized Gains		Gross Unrealized Losses		Fair Values
Available for S ale:
U.S. Government agencies and corporations	$	291,271	$	492	$	6,165	$	285,598
States and political subdivisions		11,482		211		---		11,693
Mortgage-backed securities		845		85		---		930
Corporate debt securities		6,015		20		137		5,898
Other securities		189		---		26		163
Total securities available for sale	$	309,802	$	808	$	6,328	$	304,282

Investments Classified by Contractual Maturity Date [Table Text Block]

	June 30 , 2017
	Amortized Cost		Fair Value
Available for S ale:
Due in one year or less	$	5,260	$	5,256
Due after one year through five years		209,331		207,524
Due after give years through ten years		69,853		69,207
Due after ten years		25,167		26,256
No maturity		189		192
Total securities available for sale	$	309,800	$	308,435

	June 30 , 2017
	Amortized Cost		Fair Value
Held to maturity :
Due in one year or less	$	7,291	$	7,434
Due after one year through five years		28,071		29,623
Due after give years through ten years		22,723		23,633
Due after ten years		72,627		74,607
Total securities held to maturity	$	130,712	$	135,297

Held-to-maturity Securities [Table Text Block]

	June 30 , 2017
	Amortized Costs		Gross Unrealized Gains		Gross Unrealized Losses		Fair Values
Held to M aturity:
U.S. Government agencies and corporations	$	3,934	$	243	$	---	$	4,177
State s and political subdivisions		125,563		4,356		55		129,864
Mortgage-backed securities		236		26		---		262
Corporate debt securities		979		15		---		994
Total securities held to maturity	$	130,712	$	4,640	$	55	$	135,297

	December 31, 201 6
	Amortized Costs		Gross Unrealized Gains		Gross Unrealized Losses		Fair Values
Held to M aturity:
U.S. Government agencies and corporations	$	3,934	$	201	$	---	$	4,135
States and political subdivisions		129,783		3,579		1,082		132,280
Mortgage-backed securities		265		30		---		295
Corporate debt securities		975		7		---		982
Total securities held to maturity	$	134,957	$	3,817	$	1,082	$	137,692

Schedule of Temporary Impairment Losses, Investments [Table Text Block]

	June 30 , 2017
	Less Than 12 Months				12 Months or More
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
Temporarily I mpaired S ecurities:
U.S. Gove rnment agencies and corporations	$	241,874	$	2,781	$	7,949	$	51
State s and political subdivisions		3,702		23		789		32
Corporate debt securities		949		28		---		---
Total	$	246,525	$	2,832	$	8,738	$	83

	December 31, 201 6
	Less Than 12 Months				12 Months or More
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
Temporarily I mpaired S ecurities:
U.S. Government agencies and corporations	$	260,150	$	6,161	$	996	$	4
States and political subdivisions		31,257		934		1,316		148
Corporate debt securities		3,888		137		---		---
Other securities		---		---		163		26
Total	$	295,295	$	7,232	$	2,475	$	178