Note 2 - Securities (Tables)

6 Months Ended

Jun. 30, 2022

Notes Tables

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

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
June 30, 2022
U.S. Government agency debt obligations	$	453,512,000	$	0	$	(46,177,000	)	$	407,335,000
Mortgage-backed securities		40,676,000		56,000		(4,368,000	)		36,364,000
Municipal general obligation bonds		145,002,000		190,000		(7,519,000	)		137,673,000
Municipal revenue bonds		24,287,000		18,000		(2,539,000	)		21,766,000
Other investments		500,000		0		0			500,000
	$	663,977,000	$	264,000	$	(60,603,000	)	$	603,638,000
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
June 30, 2022
U.S. Government agency debt obligations	$	176,893,000	$	17,028,000	$	230,442,000	$	29,149,000	$	407,335,000	$	46,177,000
Mortgage-backed securities		23,935,000		2,259,000		11,372,000		2,109,000		35,307,000		4,368,000
Municipal general obligation bonds		90,305,000		5,551,000		16,284,000		1,968,000		106,589,000		7,519,000
Municipal revenue bonds		12,823,000		1,454,000		7,088,000		1,085,000		19,911,000		2,539,000
	$	303,956,000	$	26,292,000	$	265,186,000	$	34,311,000	$	569,142,000	$	60,603,000

	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	%	$	3,750,000	$	3,738,000
Due in 2023 through 2027		1.14			266,931,000		250,890,000
Due in 2028 through 2032		1.84			311,780,000		277,595,000
Due in 2033 and beyond		2.33			40,340,000		34,551,000
Mortgage-backed securities		2.04			40,676,000		36,364,000
Other investments		3.88			500,000		500,000
Total available for sale securities		1.60	%	$	663,977,000	$	603,638,000