Note 3 - Investment Securities (Tables)

6 Months Ended

Jun. 30, 2023

Notes Tables

Marketable Securities [Table Text Block]

	June 30, 2023									December 31, 2022
			Gross									Gross
	Amortized		Unrealized					Fair		Amortized		Unrealized					Fair
	Cost		Gains		(Losses)			Value		Cost		Gains		(Losses)			Value
	(In Thousands)
Available-for-Sale:
U.S. government and agency obligations	$	7,416	$	163	$	(205	)	$	7,374	$	2,575	$	2	$	(187	)	$	2,390
U.S. Treasury obligations		52,462		-		(6,404	)		46,058		58,715		-		(6,764	)		51,951
Municipal obligations		152,990		67		(13,865	)		139,192		190,811		77		(18,039	)		172,849
Corporate obligations		4,242		-		(411	)		3,831		7,240		1		(251	)		6,990
Mortgage-backed securities		30,739		-		(1,952	)		28,787		31,553		-		(1,900	)		29,653
Collateralized mortgage obligations		97,648		-		(9,536	)		88,112		90,812		-		(8,681	)		82,131
Asset-backed securities		12,672		43		(105	)		12,610		3,569		-		(38	)		3,531
Total	$	358,169	$	273	$	(32,478	)	$	325,964	$	385,275	$	80	$	(35,860	)	$	349,495

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

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2023			2022			2023			2022
	(In Thousands)
Proceeds from sale of available-for-sale securities	$	11,247		$	43,794		$	34,020		$	43,794
Gross realized gain on sale of available-for-sale securities	$	49		$	-		$	69		$	-
Gross realized loss on sale of available-for-sale securities		(47	)		(6	)		(291	)		(6	)
Net realized gain (loss) on sale of available-for-sale securities	$	2		$	(6	)	$	(222	)	$	(6	)

Investments Classified by Contractual Maturity Date [Table Text Block]

	June 30, 2023
	Amortized		Fair
	Cost		Value
	(In Thousands)
Due in one year or less	$	4,354	$	4,344
Due from one to five years		28,757		26,662
Due from five to ten years		76,238		66,909
Due after ten years		120,433		111,150
		229,782		209,065
Mortgage-backed securities		30,739		28,787
Collateralized mortgage obligations		97,648		88,112
Total	$	358,169	$	325,964

Schedule of Unrealized Loss on Investments [Table Text Block]

	June 30, 2023
	Less Than 12 Months					12 Months or Longer
			Gross					Gross
	Fair		Unrealized			Fair		Unrealized
	Value		Losses			Value		Losses
	(In Thousands)
U.S. government and agency obligations	$	798	$	(92	)	$	946	$	(113	)
U.S. Treasury obligations		-		-			46,058		(6,404	)
Municipal obligations		39,143		(848	)		86,487		(13,017	)
Corporate obligations		1,118		(132	)		2,713		(279	)
Mortgage-backed securities and collateralized mortgage obligations		23,173		(951	)		93,725		(10,537	)
Asset-backed securities		9,404		(105	)		-		-
Total	$	73,636	$	(2,128	)	$	229,929	$	(30,350	)

	December 31, 2022
	Less Than 12 Months					12 Months or Longer
			Gross					Gross
	Fair		Unrealized			Fair		Unrealized
	Value		Losses			Value		Losses
	(In Thousands)
U.S. government and agency obligations	$	1,773	$	(187	)	$	-	$	-
U.S. Treasury obligations		10,969		(196	)		40,982		(6,568	)
Municipal obligations		128,036		(8,781	)		33,092		(9,258	)
Corporate obligations		4,994		(246	)		995		(5	)
Mortgage-backed securities and collateralized mortgage obligations		67,310		(3,647	)		44,444		(6,934	)
Asset-backed securities		3,531		(38	)		-		-
Total	$	216,613	$	(13,095	)	$	119,513	$	(22,765	)