Note 2 - Securities (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

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

			Gross		Gross
	Amortized		Unrealized		Unrealized			Fair
(Dollars in thousands)	Cost		Gains		Losses			Value
2023
U.S. Government agency debt obligations	$	442,496	$	0	$	(52,000	)	$	390,496
Mortgage-backed securities		35,168		20		(5,715	)		29,473
Municipal general obligation bonds		172,126		1,924		(6,190	)		167,860
Municipal revenue bonds		30,708		262		(2,207	)		28,763
Other investments		500		0		0			500
	$	680,998	$	2,206	$	(66,112	)	$	617,092
2022
U.S. Government agency debt obligations	$	453,836	$	0	$	(65,092	)	$	388,744
Mortgage-backed securities		38,002		19		(6,068	)		31,953
Municipal general obligation bonds		163,041		450		(9,058	)		154,433
Municipal revenue bonds		30,267		102		(3,063	)		27,306
Other investments		500		0		0			500
	$	685,646	$	571	$	(83,281	)	$	602,936

Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block]

	Less than 12 Months				12 Months or More				Total
(Dollars in thousands)	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
Description of Securities	Value		Loss		Value		Loss		Value		Loss
2023
U.S. Government agency debt obligations	$	0	$	0	$	390,496	$	52,000	$	390,496	$	52,000
Mortgage-backed securities		114		0		28,749		5,715		28,863		5,715
Municipal general obligation bonds		1,109		6		106,171		6,184		107,280		6,190
Municipal revenue bonds		1,506		8		20,602		2,199		22,108		2,207
Other investments		0		0		0		0		0		0
	$	2,729	$	14	$	546,018	$	66,098	$	548,747	$	66,112
2022
U.S. Government agency debt obligations	$	53,019	$	5,713	$	335,725	$	59,379	$	388,744	$	65,092
Mortgage-backed securities		31,127		6,068		12		0		31,139		6,068
Municipal general obligation bonds		97,252		4,516		32,870		4,542		130,122		9,058
Municipal revenue bonds		12,532		1,141		10,609		1,922		23,141		3,063
Other investments		0		0		0		0		0		0
	$	193,930	$	17,438	$	379,216	$	65,843	$	573,146	$	83,281

Investments Classified by Contractual Maturity Date [Table Text Block]

	Amortized		Fair
(Dollars in thousands)	Cost		Value
Due in one year or less	$	57,724	$	56,289
Due from one to five years		261,591		241,758
Due from five to ten years		279,722		243,791
Due after ten years		46,293		45,281
Mortgage-backed securities		35,168		29,473
Other investments		500		500
	$	680,998	$	617,092