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Note 4 - Securities (Tables)

6 Months Ended

Jun. 30, 2018

Notes Tables

Available-for-sale Securities [Table Text Block]

		June 30, 2018
		Amortized Costs				Gross Unrealized Gains				Gross Unrealized Losses				Fair Values
Available for S ale:
U.S. Government agencies and corporations		$	336,446			$	379			$	8,782			$	328,043
States and political subdivisions			131,020				1,866				957				131,929
Mortgage-backed securities			696				56				---				752
Corporate debt securities			7,001				8				228				6,781
Total securities available for sale		$	475,163			$	2,309			$	9,967			$	467,505

		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]

		June 30 , 2018
		Amortized Cost				Fair Value
Available for S ale:
Due in one year or less		$	77,356			$	77,289
Due after one year through five years			192,591				187,972
Due after five years through ten years			104,328				102,373
Due after ten years			100,888				99,871
Total securities available for sale		$	475,163			$	467,505

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]

		June 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		$	76,613			$	2,192			$	234,096			$	6,590
States and political subdivisions			32,536				767				2,896				190
Corporate debt securities			4,898				135				885				93
Total		$	114,047			$	3,094			$	237,877			$	6,873

		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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- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

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