Note 2 - Securities (Tables)

9 Months Ended

Sep. 30, 2021

Notes Tables

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

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
September 30, 2021
U.S. Government agency debt obligations	$	368,990,000	$	350,000	$	(4,954,000	)	$	364,386,000
Mortgage-backed securities		39,299,000		698,000		(544,000	)		39,453,000
Municipal general obligation bonds		130,681,000		4,207,000		(278,000	)		134,610,000
Municipal revenue bonds		20,468,000		327,000		(180,000	)		20,615,000
Other investments		500,000		0		0			500,000
	$	559,938,000	$	5,582,000	$	(5,956,000	)	$	559,564,000
December 31, 2020
U.S. Government agency debt obligations	$	242,522,000	$	516,000	$	(897,000	)	$	242,141,000
Mortgage-backed securities		23,869,000		1,021,000		0			24,890,000
Municipal general obligation bonds		101,991,000		5,833,000		0			107,824,000
Municipal revenue bonds		11,521,000		473,000		(2,000	)		11,992,000
Other investments		500,000		0		0			500,000
	$	380,403,000	$	7,843,000	$	(899,000	)	$	387,347,000

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, 2021
U.S. Government agency debt obligations	$	274,190,000	$	3,974,000	$	48,317,000	$	980,000	$	322,507,000	$	4,954,000
Mortgage-backed securities		23,578,000		544,000		23,000		0		23,601,000		544,000
Municipal general obligation bonds		32,180,000		278,000		0		0		32,180,000		278,000
Municipal revenue bonds		11,098,000		158,000		820,000		22,000		11,918,000		180,000
	$	341,046,000	$	4,954,000	$	49,160,000	$	1,002,000	$	390,206,000	$	5,956,000

	Less than 12 Months				12 Months or More				Total
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
December 31, 2020
U.S. Government agency debt obligations	$	118,650,000	$	897,000	$	0	$	0	$	118,650,000	$	897,000
Mortgage-backed securities		0		0		0		0		0		0
Municipal general obligation bonds		0		0		0		0		0		0
Municipal revenue bonds		423,000		2,000		0		0		423,000		2,000
	$	119,073,000	$	899,000	$	0	$	0	$	119,073,000	$	899,000

Investments Classified by Contractual Maturity Date [Table Text Block]

	Weighted Average Yield			Amortized Cost		Fair Value
Due in 2021		2.25	%	$	545,000	$	547,000
Due in 2022 through 2026		1.01			187,220,000		188,005,000
Due in 2027 through 2031		1.56			266,478,000		265,719,000
Due in 2032 and beyond		1.98			65,896,000		65,340,000
Mortgage-backed securities		1.76			39,299,000		39,453,000
Other investments		3.75			500,000		500,000
Total available for sale securities		1.44	%	$	559,938,000	$	559,564,000