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Note 4 - Securities (Tables)

9 Months Ended

Sep. 30, 2018

Notes Tables

Available-for-sale Securities [Table Text Block]

		September 30, 2018
		Amortized Costs				Gross Unrealized Gains				Gross Unrealized Losses				Fair Values
Available for S ale:
U.S. Government agencies and corporations		$	329,455			$	267			$	9,751			$	319,971
States and political subdivisions			121,515				1,272				1,704				121,083
Mortgage-backed securities			632				47				---				679
Corporate debt securities			7,003				14				265				6,752
Total securities available for sale		$	458,605			$	1,600			$	11,720			$	448,485

		December 31, 2017
		Amortized Costs				Gross Unrealized Gains				Gross Unrealized Losses				Fair Values
Available for S ale:
U.S. Government agencies and corporations		$	312,604			$	609			$	5,494			$	307,719
States and political subdivisions			16,853				100				119				16,834
Mortgage-backed securities			602				57				---				659
Corporate debt securities			6,016				188				29				6,175
Total securities available for sale		$	336,075			$	954			$	5,642			$	331,387

Investments Classified by Contractual Maturity Date [Table Text Block]

		September 30 , 2018
		Amortized Cost				Fair Value
Available for S ale:
Due in one year or less		$	81,642			$	81,455
Due after one year through five years			184,604				179,518
Due after five years through ten years			97,187				94,744
Due after ten years			95,172				92,768
Total securities available for sale		$	458,605			$	448,485

Debt Securities, Held-to-maturity [Table Text Block]

		December 31, 2017
		Amortized Costs				Gross Unrealized Gains				Gross Unrealized Losses				Fair Values
Held to M aturity:
U.S. Government agencies and corporations		$	3,934			$	167			$	---			$	4,101
States and political subdivisions			122,039				2,929				173				124,795
Mortgage-backed securities			209				21				---				230
Corporate debt securities			982				5				---				987
Total securities held to maturity		$	127,164			$	3,122			$	173			$	130,113

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

		September 30, 2018
		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		$	68,197			$	2,570			$	244,485			$	7,181
States and political subdivisions			42,422				1,293				5,514				411
Corporate debt securities			4,870				164				877				101
Total		$	115,489			$	4,027			$	250,876			$	7,693

		December 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. Government agencies and corporations		$	68,380			$	871			$	225,738			$	4,623
States and political subdivisions			18,688				194				2,989				98
Corporate debt securities			---				---				948				29
Total		$	87,068			$	1,065			$	229,675			$	4,750

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