Note 2 - Securities (Tables)

6 Months Ended

Jun. 30, 2023

Notes Tables

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

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
June 30, 2023
U.S. Government agency debt obligations	$	454,164,000	$	0	$	(61,070,000	)	$	393,094,000
Mortgage-backed securities		36,374,000		10,000		(5,864,000	)		30,520,000
Municipal general obligation bonds		165,793,000		511,000		(8,739,000	)		157,565,000
Municipal revenue bonds		30,010,000		104,000		(2,821,000	)		27,293,000
Other investments		500,000		0		0			500,000
	$	686,841,000	$	625,000	$	(78,494,000	)	$	608,972,000
December 31, 2022
U.S. Government agency debt obligations	$	453,836,000	$	0	$	(65,092,000	)	$	388,744,000
Mortgage-backed securities		38,002,000		19,000		(6,068,000	)		31,953,000
Municipal general obligation bonds		163,041,000		450,000		(9,058,000	)		154,433,000
Municipal revenue bonds		30,267,000		102,000		(3,063,000	)		27,306,000
Other investments		500,000		0		0			500,000
	$	685,646,000	$	571,000	$	(83,281,000	)	$	602,936,000

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

	Less than 12 Months				12 Months or More				Total
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
June 30, 2023
U.S. Government agency debt obligations	$	2,862,000	$	940,000	$	390,232,000	$	60,130,000	$	393,094,000	$	61,070,000
Mortgage-backed securities		27,997,000		5,759,000		1,811,000		105,000		29,808,000		5,864,000
Municipal general obligation bonds		39,970,000		1,476,000		92,626,000		7,263,000		132,596,000		8,739,000
Municipal revenue bonds		7,262,000		810,000		15,628,000		2,011,000		22,890,000		2,821,000
	$	78,091,000	$	8,985,000	$	500,297,000	$	69,509,000	$	578,388,000	$	78,494,000

	Less than 12 Months				12 Months or More				Total
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
December 31, 2022
U.S. Government agency debt obligations	$	53,019,000	$	5,713,000	$	335,725,000	$	59,379,000	$	388,744,000	$	65,092,000
Mortgage-backed securities		31,127,000		6,068,000		12,000		0		31,139,000		6,068,000
Municipal general obligation bonds		97,252,000		4,516,000		32,870,000		4,542,000		130,122,000		9,058,000
Municipal revenue bonds		12,532,000		1,141,000		10,609,000		1,922,000		23,141,000		3,063,000
	$	193,930,000	$	17,438,000	$	379,216,000	$	65,843,000	$	573,146,000	$	83,281,000

Investments Classified by Contractual Maturity Date [Table Text Block]

	Weighted Average Yield		Amortized Cost		Fair Value
Due in 2023		0.32%	$	12,635,000	$	12,401,000
Due in 2024 through 2028		1.32		319,466,000		291,127,000
Due in 2029 through 2033		2.02		278,432,000		237,792,000
Due in 2034 and beyond		3.64		39,434,000		36,632,000
Mortgage-backed securities		2.15		36,374,000		30,520,000
Other investments		8.50		500,000		500,000
Total available for sale securities		1.77%	$	686,841,000	$	608,972,000