Note 3 - Securities (Tables)

12 Months Ended

Dec. 31, 2022

Notes Tables

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

	December 31, 2022
Available for sale:	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
U.S. government agencies and corporations	$	391,538	$	39	$	55,002	$	336,575
States and political subdivisions		190,192		26		38,018		152,200
Mortgage-backed securities		170,694		22		9,239		161,477
Corporate debt securities		6,501		-		837		5,664
U.S. treasury		992		-		56		936
Total securities available for sale	$	759,917	$	87	$	103,152	$	656,852

	December 31, 2021
Available for sale:	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
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]

	December 31, 2022
Available for sale:	Amortized Cost		Fair Value
Due in one year or less	$	2,779	$	2,738
Due after one year through five years		139,168		129,798
Due after five years through ten years		328,812		279,880
Due after ten years		289,158		244,436
Total securities available for sale	$	759,917	$	656,852

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

	December 31, 2022
	Less Than 12 Months				12 Months or More
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
U.S. government agencies and corporations	$	144,574	$	12,699	$	190,950	$	42,303
State and political subdivisions		94,657		18,373		52,134		19,645
Mortgage-backed securities		144,198		7,326		15,165		1,913
Corporate debt securities		4,843		655		821		182
U.S. treasury		936		56		-		-
Total temporarily impaired securities	$	389,208	$	39,109	$	259,070	$	64,043

	December 31, 2021
	Less Than 12 Months				12 Months or More
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
U.S. Government agencies and corporations	$	201,650	$	3,530	$	26,792	$	1,180
State 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

Schedule of Realized Gain (Loss) on Called Securities [Table Text Block]

	For the year ended December 31, 2021
	Proceeds		Book Value		Gross Gain		Gross Loss		Net Gain
Available for sale	$	20,377	$	20,371	$	6	$	-	$	6