Note 2 - Securities (Tables)

3 Months Ended

Mar. 31, 2021

Notes Tables

Available-for-sale Securities [Table Text Block]

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
March 31, 2021
U.S. Government agency debt obligations	$	274,038,000	$	362,000	$	(7,572,000	)	$	266,828,000
Mortgage-backed securities		35,211,000		925,000		(328,000	)		35,808,000
Municipal general obligation bonds		111,294,000		4,517,000		(274,000	)		115,537,000
Municipal revenue bonds		15,438,000		303,000		(157,000	)		15,584,000
Other investments		500,000		0		0			500,000
	$	436,481,000	$	6,107,000	$	(8,331,000	)	$	434,257,000
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

Available-for-sale Securities, Continuous 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, 2021
U.S. Government agency debt obligations	$	234,832,000	$	7,572,000	$	0	$	0	$	234,832,000	$	7,572,000
Mortgage-backed securities		7,264,000		328,000		0		0		7,264,000		328,000
Municipal general obligation bonds		13,961,000		274,000		0		0		13,961,000		274,000
Municipal revenue bonds		6,796,000		157,000		0		0		6,796,000		157,000
	$	262,853,000	$	8,331,000	$	0	$	0	$	262,853,000	$	8,331,000

	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		Amortized		Fair
	Yield (%)		Cost		Value
Due in 2021		2.53	$	5,414,000	$	5,425,000
Due in 2022 through 2026		1.16		142,876,000		143,569,000
Due in 2027 through 2031		1.63		197,842,000		195,378,000
Due in 2032 and beyond		2.02		54,638,000		53,577,000
Mortgage-backed securities		1.83		35,211,000		35,808,000
Other investments		3.75		500,000		500,000
Total available for sale securities		1.55	$	436,481,000	$	434,257,000