Note 4 - Securities (Tables)

3 Months Ended

Mar. 31, 2022

Notes Tables

Debt Securities, Available-for-Sale [Table Text Block]

	March 31, 2022
	Amortized Costs		Gross Unrealized Gains		Gross Unrealized Losses		Fair Values
Available for Sale:
U.S. Treasuries	$	989	$	-	$	25	$	964
U.S. Government agencies and corporations		344,348		904		22,864		322,388
States and political subdivisions		193,185		416		14,801		178,800
Mortgage-backed securities		193,538		70		2,722		190,886
Corporate debt securities		6,499		-		183		6,316
Total securities available for sale	$	738,559	$	1,390	$	40,595	$	699,354

	December 31, 2021
	Amortized Costs		Gross Unrealized Gains		Gross Unrealized Losses		Fair Values
Available for Sale:
U.S. Government agencies and corporations	$	279,934	$	2,795	$	4,710	$	278,019
States and political subdivisions		195,365		5,314		2,007		198,672
Mortgage-backed securities		204,164		2,323		313		206,174
Corporate debt securities		3,004		248		37		3,215
Total securities available for sale	$	682,467	$	10,680	$	7,067	$	686,080

Investments Classified by Contractual Maturity Date [Table Text Block]

	March 31, 2022
	Amortized Cost		Fair Value
Available for Sale:
Due in one year or less	$	1,317	$	1,325
Due after one year through five years		79,070		77,180
Due after five years through ten years		329,371		310,296
Due after ten years		328,801		310,553
Total securities available for sale	$	738,559	$	699,354

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

	March 31, 2022
	Less Than 12 Months				12 Months or More
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
U.S. Treasuries	$	964	$	25	$	-	$	-
U.S. Government agencies and corporations		238,220		14,294		68,352		8,570
States and political subdivisions		120,206		8,951		36,298		5,850
Mortgage-backed securities		160,387		2,262		9,623		460
Corporate debt securities		5,317		183		-		-
Total temporarily impaired securities	$	525,094	$	25,715	$	114,273	$	14,880

	December 31, 2021
	Less Than 12 Months
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
U.S. Government agencies and corporations	$	201,650	$	3,530	$	26,792	$	1,180
States and political subdivisions		50,659		1,214		20,542		793
Mortgage-backed securities		13,139		141		4,665		172
Corporate debt securities		966		37		-		-
Total temporarily impaired securities	$	266,414	$	4,922	$	51,999	$	2,145