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Note 4 - Debt Securities (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

Schedule of Available-for-sale Securities Reconciliation [Table Text Block]

						Gross				Gross
		Amortized				Unrealized				Unrealized				Estimated
		Cost				Gains				Losses				Fair Value
2020:
U.S. government treasuries		$	11,725			$	328			$	-			$	12,053
U.S. government agencies			106,337				4,875				(13	)			111,199
U.S. government mortgage-backed securities			146,889				3,337				(31	)			150,195
State and political subdivisions			243,438				8,182				(36	)			251,584
Corporate bonds			67,247				4,722				(1	)			71,968
Total		$	575,636			$	21,444			$	(81	)		$	596,999

						Gross				Gross
		Amortized				Unrealized				Unrealized				Estimated
		Cost				Gains				Losses				Fair Value
2019:
U.S. government treasuries		$	9,392			$	64			$	(4	)		$	9,452
U.S. government agencies			124,913				1,609				(89	)			126,433
U.S. government mortgage-backed securities			80,295				867				(34	)			81,128
State and political subdivisions			193,745				1,852				(295	)			195,302
Corporate bonds			66,012				1,542				(26	)			67,528
Total		$	474,357			$	5,934			$	(448	)		$	479,843

Investments Classified by Contractual Maturity Date [Table Text Block]

		Amortized				Estimated
		Cost				Fair Value
Due in one year or less		$	44,983			$	45,329
Due after one year through five years			242,363				251,324
Due after five years through ten years			237,913				247,562
Due after ten years			50,377				52,784
Total		$	575,636			$	596,999

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

		2020				2019
Proceeds from sales of securities available-for-sale		$	5,463			$	8,211
Gross realized gains on securities available-for-sale			430				37
Gross realized losses on securities available-for-sale			-				20

Schedule of Unrealized Loss on Investments [Table Text Block]

2020:		Less than 12 Months								12 Months or More								Total
		Estimated				Gross				Estimated				Gross				Estimated				Gross
		Fair				Unrealized				Fair				Unrealized				Fair				Unrealized
		Value				Losses				Value				Losses				Value				Losses
Securities available for sale:
U.S. government agencies		$	6,016			$	(7	)		$	896			$	(6	)		$	6,912			$	(13	)
U.S. government mortgage-backed securities			5,097				(31	)			-				-				5,097				(31	)
State and political subdivisions			7,875				(34	)			180				(2	)			8,055				(36	)
Corporate bonds			534				(1	)			-				-				534				(1	)
Total		$	19,522			$	(73	)		$	1,076			$	(8	)		$	20,598			$	(81	)

2019:		Less than 12 Months								12 Months or More								Total
		Estimated				Gross				Estimated				Gross				Estimated				Gross
		Fair				Unrealized				Fair				Unrealized				Fair				Unrealized
		Value				Losses				Value				Losses				Value				Losses
Securities available for sale:
U.S. government treasuries		$	3,023			$	(4	)		$	-			$	-			$	3,023			$	(4	)
U.S. government agencies			23,827				(85	)			2,520				(4	)			26,347				(89	)
U.S. government mortgage-backed securities			14,885				(28	)			1,934				(6	)			16,819				(34	)
State and political subdivisions			17,512				(125	)			5,954				(170	)			23,466				(295	)
Corporate bonds			4,129				(26	)			-				-				4,129				(26	)
Total		$	63,376			$	(268	)		$	10,408			$	(180	)		$	73,784			$	(448	)

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