Note 3 - Securities (Tables)

12 Months Ended

Dec. 31, 2016

Notes Tables

Available-for-sale Securities [Table Text Block]

	December 31, 2016
Available for sale:	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
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

	December 31, 2015
Available for sale:	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		F air Value
U.S. Government agencies and corporations	$	216,897	$	519	$	4,952	$	212,464
States and political subdivisions		15,934		541		---		16,475
Mortgage-backed securities		1,199		120		---		1,319
Corporate debt securities		6,015		22		291		5,746
Other securities		189		---		62		127
Total securities available for sale	$	240,234	$	1,202	$	5,305	$	236,131

Investments Classified by Contractual Maturity Date [Table Text Block]

	December 31, 20 1 6
Available for sale:	Amortized Cost		Fair Value
Due in one year or less	$	3,414	$	3,423
Due after one year through five years		199,430		196,433
Due after five years through ten years		80,548		78,001
Due after ten years		26,221		26,262
No maturity		189		163
	$	309,802	$	304,282

	December 31, 20 1 6
Held to maturity:	Amortized Cost		Fair Value
Due in one year or less	$	3,902	$	3,988
Due after one year through five years		28,249		29,761
Due after five years through ten years		16,615		17,155
Due after ten years		86,191		86,788
	$	134,957	$	137,692

Held-to-maturity Securities [Table Text Block]

	December 31, 20 1 6
Held to maturity:	Amortized Cost		Gross U nrealized Gains		Gross Unrealized Losses		Fair Value
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

	December 31, 20 1 5
Held to maturity:	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
U.S. Government agencies and corporations	$	13,909	$	288	$	177	$	14,020
States and political subdivisions		136,373		6,179		330		142,222
Mortgage-backed securities		327		36		---		363
Corporate debt securities		1,419		10		2		1,427
Total securities held to maturity	$	152,028	$	6,513	$	509	$	158,032

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

	December 31, 2016
	Less Than 12 Months				12 Months or More
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
U. S. Government agencies and corporations	$	260,150	$	6,161	$	996	$	4
State and political subdivisions		31,257		934		1,316		148
Corporate debt securities		3,888		137		---		---
Other securities		---		---		163		26
Total temporarily impaired securities	$	295,295	$	7,232	$	2,475	$	178

	December 31, 2015
	Less Than 12 Months				12 Months or More
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
U. S. Government agencies and corporations	$	88,255	$	1,800	$	84,959	$	3,329
State and political subdivisions		3,449		24		10,161		306
Corporate debt securities		4,974		292		200		1
Other securities		---		---		127		62
Total temporarily impaired securities	$	96,678	$	2,116	$	95,447	$	3,698

Schedule of Realized Gain (Loss) on Called Securities [Table Text Block]

	For the year ended December 31, 2016
	Proceeds			Book Value		Gross Gain		Gross Loss		Net Gain (Loss)
Available for sale	$	220,520	$	220,334	$	186	$	---	$	186
Held to maturity		16,160		16,114		46		---		46

	For the year ended December 31, 2015
	Proceeds			Book Value		Gross Gain		Gross Loss		Net Gain (Loss)
Available for sale	$	63,775	$	63,742	$	34	$	1	$	33
Held to maturity		7,605		7,605		---		---		---

	For the year ended December 31, 2014
	Proceeds			Book Value		Gross Gain		Gross Loss		Net Gain (Loss)
Available for sale	$	6,919	$	6,917	$	4	$	2	$	2
Held to maturity		7,162		7,162		1		1		---