Note 4 - Securities (Tables)

3 Months Ended

Mar. 31, 2019

Notes Tables

Available-for-sale Securities [Table Text Block]

	March 31, 2019
	Amortized Costs		Gross Unrealized Gains		Gross Unrealized Losses		Fair Values
Available for Sale:
U.S. Government agencies and corporations	$	291,215	$	987	$	2,860	$	289,342
States and political subdivisions		109,556		1,506		248		110,814
Mortgage-backed securities		550		46		---		596
Corporate debt securities		3,992		1		100		3,893
Total securities available for sale	$	405,313	$	2,540	$	3,208	$	404,645

	December 31, 2018
	Amortized Costs		Gross Unrealized Gains		Gross Unrealized Losses		Fair Values
Available for S ale:
U.S. Government agencies and corporations	$	306,264	$	449	$	6,666	$	300,047
States and political subdivisions		118,564		1,218		1,166		118,616
Mortgage-backed securities		586		42		---		628
Corporate debt securities		6,014		---		295		5,719
Total securities available for sale	$	431,428	$	1,709	$	8,127	$	425,010

Investments Classified by Contractual Maturity Date [Table Text Block]

	March 31 , 201 9
	Amortized Cost		Fair Value
Available for S ale:
Due in one year or less	$	62,607	$	62,459
Due after one year through five years		174,190		172,334
Due after five years through ten years		82,061		82,551
Due after ten years		86,455		87,301
Total securities available for sale	$	405,313	$	404,645

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

	March 31, 2018
	Amortized Costs		Gross Unrealized Gains		Gross Unrealized Losses		Fair Values
Held to M aturity:
U.S. Government agencies and corporations	$	3,934	$	99	$	1	$	4,032
States and political subdivisions		117,791		2,184		649		119,326
Mortgage-backed securities		196		18		---		214
Corporate debt securities		984		---		7		977
Total securities held to maturity	$	122,905	$	2,301	$	657	$	124,549

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

	March 31, 2019
	Less Than 12 Months				12 Months or More
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
Temporarily Impaired Securities:
U.S. Government agencies and corporations	$	941	$	1	$	235,610	$	2,859
States and political subdivisions		556		84		12,300		164
Corporate debt securities		---		---		2,893		100
Total	$	1,497	$	85	$	250,803	$	3,123

	December 31, 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	$	17,730	$	216	$	259,992	$	6,450
States and political subdivisions		16,882		352		20,758		814
Corporate debt securities		4,842		194		876		101
Total	$	39,454	$	762	$	281,626	$	7,365