Note 2 - Securities (Tables)

9 Months Ended

Sep. 30, 2022

Notes Tables

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

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
September 30, 2022
U.S. Government agency debt obligations	$	453,675,000	$	0	$	(68,219,000	)	$	385,456,000
Mortgage-backed securities		39,011,000		12,000		(6,366,000	)		32,657,000
Municipal general obligation bonds		155,294,000		31,000		(13,304,000	)		142,021,000
Municipal revenue bonds		26,245,000		0		(3,880,000	)		22,365,000
Other investments		500,000		0		0			500,000
	$	674,725,000	$	43,000	$	(91,769,000	)	$	582,999,000
December 31, 2021
U.S. Government agency debt obligations	$	398,874,000	$	266,000	$	(8,769,000	)	$	390,371,000
Mortgage-backed securities		41,906,000		549,000		(652,000	)		41,803,000
Municipal general obligation bonds		133,894,000		4,092,000		(392,000	)		137,594,000
Municipal revenue bonds		22,289,000		331,000		(145,000	)		22,475,000
Other investments		500,000		0		0			500,000
	$	597,463,000	$	5,238,000	$	(9,958,000	)	$	592,743,000

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
September 30, 2022
U.S. Government agency debt obligations	$	110,145,000	$	16,096,000	$	275,311,000	$	52,123,000	$	385,456,000	$	68,219,000
Mortgage-backed securities		31,918,000		6,365,000		13,000		1,000		31,931,000		6,366,000
Municipal general obligation bonds		108,512,000		8,687,000		26,039,000		4,617,000		134,551,000		13,304,000
Municipal revenue bonds		13,504,000		1,759,000		8,861,000		2,121,000		22,365,000		3,880,000
	$	264,079,000	$	32,907,000	$	310,224,000	$	58,862,000	$	574,303,000	$	91,769,000

	Less than 12 Months				12 Months or More				Total
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
December 31, 2021
U.S. Government agency debt obligations	$	274,287,000	$	5,274,000	$	110,053,000	$	3,495,000	$	384,340,000	$	8,769,000
Mortgage-backed securities		23,184,000		652,000		24,000		0		23,208,000		652,000
Municipal general obligation bonds		40,748,000		392,000		0		0		40,748,000		392,000
Municipal revenue bonds		12,843,000		137,000		414,000		8,000		13,257,000		145,000
	$	351,062,000	$	6,455,000	$	110,491,000	$	3,503,000	$	461,553,000	$	9,958,000

Investments Classified by Contractual Maturity Date [Table Text Block]

	Weighted Average Yield		Amortized Cost		Fair Value
Due in 2022		1.35%	$	3,739,000	$	3,732,000
Due in 2023 through 2027		1.15		267,809,000		242,952,000
Due in 2028 through 2032		1.86		316,237,000		264,643,000
Due in 2033 and beyond		2.58		47,429,000		38,515,000
Mortgage-backed securities		2.09		39,011,000		32,657,000
Other investments		4.33		500,000		500,000
Total available for sale securities		1.64%	$	674,725,000	$	582,999,000