Note 3 - Debt and Equity Securities (Tables)

3 Months Ended

Mar. 31, 2020

Notes Tables

Marketable Securities [Table Text Block]

	March 31, 2020
	Securities Available-For-Sale
	In Thousands
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Market Value
U.S. Government-sponsored enterprises (GSEs)	$	52,754	$	305	$	121	$	52,938
Mortgage-backed securities		248,255		6,219		258		254,216
Asset-backed securities		26,358		375		403		26,330
Obligations of states and political subdivisions		73,364		1,291		915		73,740
	$	400,731	$	8,190	$	1,697	$	407,224

	December 31, 2019
	Securities Available-For-Sale
	In Thousands
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Market Value
U.S. Government-sponsored enterprises (GSEs)	$	59,735	$	48	$	204	$	59,579
Mortgage-backed securities		265,648		2,300		635		267,313
Asset-backed securities		27,531		1		303		27,229
Obligations of states and political subdivisions		67,293		559		828		67,024
	$	420,207	$	2,908	$	1,970	$	421,145

Investments Classified by Contractual Maturity Date [Table Text Block]

	Available-For-Sale
	In Thousands
	Amortized Cost		Estimated Market Value
Due in one year or less	$	470	$	469
Due after one year through five years		12,372		12,486
Due after five years through ten years		70,268		71,430
Due after ten years		317,621		322,839
	$	400,731	$	407,224

Schedule of Unrealized Loss on Investments [Table Text Block]

	In Thousands, Except Number of Securities
	Less than 12 Months						12 Months or More						Total
March 31, 2020	Fair Value		Unrealized Losses		Number of Securities Included		Fair Value		Unrealized Losses		Number of Securities Included		Fair Value		Unrealized Losses
Available-for-Sale Securities:
GSEs	$	7,093	$	121		3	$	—	$	—		—	$	7,093	$	121
Mortgage-backed securities		17,935		206		9		5,163		52		14		23,098		258
Asset-backed securities		9,664		403		2		—		—		—		9,664		403
Obligations of states and political subdivisions		30,592		873		38		1,173		42		3		31,765		915
	$	65,284	$	1,603		52	$	6,336	$	94		17	$	71,620	$	1,697

	In Thousands, Except Number of Securities
	Less than 12 Months						12 Months or More						Total
December 31, 2019	Fair Value		Unrealized Losses		Number of Securities Included		Fair Value		Unrealized Losses		Number of Securities Included		Fair Value		Unrealized Losses
Available-for-Sale Securities:
GSEs	$	16,507	$	114		5	$	24,658	$	90		9	$	41,165	$	204
Mortgage-backed securities		45,862		182		21		56,917		453		52		102,779		635
Asset-backed securities		17,807		161		10		7,317		142		4		25,124		303
Obligations of states and political subdivisions		30,423		783		26		3,858		45		10		34,281		828
	$	110,599	$	1,240		62	$	92,750	$	730		75	$	203,349	$	1,970