Note 2 - Securities (Tables)

3 Months Ended

Mar. 31, 2022

Notes Tables

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

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
March 31, 2022
U.S. Government agency debt obligations	$	442,500,000	$	74,000	$	(31,996,000	)	$	410,578,000
Mortgage-backed securities		40,215,000		123,000		(2,592,000	)		37,746,000
Municipal general obligation bonds		138,916,000		540,000		(4,785,000	)		134,671,000
Municipal revenue bonds		23,900,000		39,000		(1,773,000	)		22,166,000
Other investments		500,000		0		0			500,000
	$	646,031,000	$	776,000	$	(41,146,000	)	$	605,661,000
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		Unrealized		Fair		Unrealized		Fair		Unrealized
	Value		Loss		Value		Loss		Value		Loss
March 31, 2022
U.S. Government agency debt obligations	$	190,990,000	$	11,971,000	$	215,783,000	$	20,025,000	$	406,773,000	$	31,996,000
Mortgage-backed securities		26,110,000		1,783,000		6,594,000		809,000		32,704,000		2,592,000
Municipal general obligation bonds		63,139,000		3,399,000		12,600,000		1,386,000		75,739,000		4,785,000
Municipal revenue bonds		13,671,000		999,000		5,842,000		774,000		19,513,000		1,773,000
	$	293,910,000	$	18,152,000	$	240,819,000	$	22,994,000	$	534,729,000	$	41,146,000

	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		Amortized		Fair
	Yield (%)		Cost		Value
Due in 2022		1.98	$	10,171,000	$	10,171,000
Due in 2023 through 2027		1.11		263,429,000		251,105,000
Due in 2028 through 2032		1.74		295,377,000		273,366,000
Due in 2033 and beyond		2.13		36,339,000		32,773,000
Mortgage-backed securities		1.95		40,215,000		37,746,000
Other investments		3.75		500,000		500,000
Total available for sale securities		1.52	$	646,031,000	$	605,661,000