Note 3 - Securities (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

Available-for-sale Securities [Table Text Block]

	December 31, 2019
Available for sale:	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
U.S. Government agencies and corporations	$	119,903	$	1,995	$	775	$	121,123
States and political subdivisions		88,092		791		644		88,239
Mortgage-backed securities		223,173		45		1,435		221,783
Corporate debt securities		3,998		120		---		4,118
Total securities available for sale	$	435,166	$	2,951	$	2,854	$	435,263

	December 31, 2018
Available for sale:	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
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]

	December 31, 20 1 9
Available for sale:	Amortized Cost		Fair Value
Due in one year or less	$	55,186	$	55,302
Due after one year through five years		6,342		6,505
Due after five years through ten years		145,040		144,260
Due after ten years		228,598		229,196
Total securities available for sale	$	435,166	$	435,263

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

	December 31, 2019
	Less Than 12 Months				12 Months or More
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
U.S. Government agencies and corporations	$	53,244	$	738	$	38,962	$	37
State and political subdivisions		35,934		596		591		48
Mortgage-backed securities		181,279		1,435		---		---
Total temporarily impaired securities	$	270,457	$	2,769	$	39,553	$	85

	December 31, 2018
	Less Than 12 Months				12 Months or More
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
U.S. Government agencies and corporations	$	17,730	$	216	$	259,992	$	6,450
State and political subdivisions		16,882		352		20,758		814
Corporate debt securities		4,842		194		876		101
Total temporarily impaired securities	$	39,454	$	762	$	281,626	$	7,365

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

	For the year ended December 31, 201 9
	Proceeds		Book Value		Gross Gain		Gross Loss		Net Gain
Available for sale	$	348,032	$	347,466	$	1,157	$	591	$	566

	For the year ended December 31, 2018
	Proceeds		Book Value		Gross Gain		Gross Loss		Net Gain
Available for sale	$	17,287	$	17,270	$	17	$	---	$	17
Held to maturity		6,430		6,430		---		---		---

	For the year ended December 31, 2017
	Proceeds		Book Value		Gross Gain		Gross Loss		Net Gain
Available for sale	$	13,620	$	13,614	$	10	$	---	$	10
Held to maturity		8,975		8,971		4		---		4