Note 3 - Securities (Tables)

12 Months Ended

Dec. 31, 2014

Investments, Debt and Equity Securities [Abstract]

Available-for-sale Securities [Table Text Block]

	December 31, 2014
Available for sale:	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
U.S. Government agencies and corporations		197,740		973		4,494		194,219
States and political subdivisions		18,529		851		---		19,380
Mortgage-backed securities		1,830		184		---		2,014
Corporate debt securities		6,991		140		27		7,104
Other securities		189		---		62		127
Total securities available for sale	$	225,279	$	2,148	$	4,583	$	222,844

	December 31, 2013
Available for sale:	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
U.S. Government agencies and corporations		169,818		199		22,163		147,854
States and political subdivisions		22,830		746		120		23,456
Mortgage-backed securities		2,627		213		----		2,840
Corporate debt securities		7,804		97		506		7,395
Other securities		189		---		22		167
Total securities available for sale	$	203,268	$	1,255	$	22,811	$	181,712

Investments Classified by Contractual Maturity Date [Table Text Block]

	December 31, 2014
	Amortized Cost		Fair Value
Due in one year or less	$	1,864	$	1,899
Due after one year through five years		30,930		31,171
Due after five years through ten years		30,161		30,156
Due after ten years		162,135		159,491
No maturity		189		127
	$	225,279	$	222,844

	December 31, 2014
	Amortized Cost		Fair Value
Due in one year or less	$	1,637	$	1,650
Due after one year through five years		4,987		5,262
Due after five years through ten years		24,052		25,181
Due after ten years		130,776		135,610
	$	161,452	$	167,703

Held-to-maturity Securities [Table Text Block]

	December 31, 2014
Held to maturity:	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
U.S. Government agencies and corporations	$	18,922	$	350	$	245	$	19,027
States and political subdivisions		140,702		6,823		727		146,798
Mortgage-backed securities		415		51		---		466
Corporate debt securities		1,413		1		2		1,412
Total securities held to maturity	$	161,452	$	7,225	$	974	$	167,703

	December 31, 2013
Held to maturity:	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
U.S. Government agencies and corporations	$	13,973	$	280	$	1,448	$	12,805
States and political subdivisions		149,490		2,971		6,502		145,959
Mortgage-backed securities		520		53		---		573
Total securities held to maturity	$	163,983	$	3,304	$	7,950	$	159,337

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

	December 31, 2014
	Less Than 12 Months				12 Months or More
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
U. S. Government agencies and corporations	$	6,964	$	30	$	156,149	$	4,709
State and political subdivisions		1,222		35		19,818		692
Corporate debt securities		450		2		1,948		27
Other securities		---		---		127		62
Total temporarily impaired securities	$	8,636	$	67	$	178,042	$	5,490

	December 31, 2013
	Less Than 12 Months				12 Months or More
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
U. S. Government agencies and corporations	$	138,324	$	20,400	$	15,796	$	3,211
State and political subdivisions		58,013		6,131		2,697		491
Corporate debt securities		5,511		506		---		---
Other securities		167		22		---		---
Total temporarily impaired securities	$	202,015	$	27,059	$	18,493	$	3,702