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Note 4 - Securities (Tables)

3 Months Ended

Mar. 31, 2017

Notes Tables

Available-for-sale Securities [Table Text Block]

		March 31, 2017
		Amortized Costs				Gross Unrealized Gains				Gross Unrealized Losses				Fair Values
Available for S ale:
U.S. Government agencies and corporations		$	291,278			$	584			$	4,649			$	287,213
State s and political subdivisions			9,977				185				---				10,162
Mortgage-backed securities			782				82				---				864
Corporate debt securities			6,015				69				127				5,957
Other securities			189				---				9				180
Total securities available for sale		$	308,241			$	920			$	4,785			$	304,376

		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		$	309,842			$	808			$	6,328			$	304,282

Investments Classified by Contractual Maturity Date [Table Text Block]

		March 31, 2017
		Amortized Cost				Fair Value
Available for S ale:
Due in one year or less		$	4,160			$	4,169
Due after one year through five years			204,152				201,752
Due after give years through ten years			75,541				73,852
Due after ten years			24,199				24,423
No maturity			189				180
Total securities available for sale		$	308,241			$	304,376

		March 31, 2017
		Amortized Cost				Fair Value
Held to maturity :
Due in one year or less		$	7,620			$	7,778
Due after one year through five years			26,018				27,490
Due after give years through ten years			20,849				21,558
Due after ten years			79,109				80,308
Total securities held to maturity		$	133,596			$	137,134

Held-to-maturity Securities [Table Text Block]

		March 31, 2017
		Amortized Costs				Gross Unrealized Gains				Gross Unrealized Losses				Fair Values
Held to M aturity:
U.S. Government agencies and corporations		$	3,934			$	220			$	---			$	4,154
State s and political subdivisions			128,437				3,834				558				131,713
Mortgage-backed securities			248				28				---				276
Corporate debt securities			977				14				---				991
Total securities held to maturity		$	133,596			$	4,096			$	558			$	137,134

		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]

		March 31, 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		$	264,648			$	4,645			$	1,995			$	4
State s and political subdivisions			21,505				483				1,389				75
Corporate debt securities			2,890				127				---				---
Other securities			---				---				180				9
Total		$	289,043			$	5,255			$	3,564			$	88

		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

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