Note 4 - Securities Available for Sale (Tables)

12 Months Ended

Dec. 31, 2022

Notes Tables

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

(Dollars in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
December 31, 2022
Mortgage-backed securities:
Federal National Mortgage Association (FNMA)	$	117,690		0		(12,754	)		104,936
Federal Home Loan Mortgage Corporation (FHLMC)		98,893		0		(11,177	)		87,716
Collateralized mortgage obligations:
FNMA		38		0		(2	)		36
		216,621		0		(23,933	)		192,688
Other marketable securities:
U.S. Government agency obligations		54,998		0		(2,157	)		52,841
Corporate preferred stock		700		0		(210	)		490
		55,698		0		(2,367	)		53,331
Total	$	272,319		0		(26,300	)		246,019
December 31, 2021
Mortgage-backed securities:
FNMA	$	138,628		550		(1,367	)		137,811
FHLMC		108,599		126		(1,189	)		107,536
Collateralized mortgage obligations:
FNMA		48		2		0			50
		247,275		678		(2,556	)		245,397
Other marketable securities:
U.S. Government agency obligations		39,991		56		(337	)		39,710
Corporate preferred stock		700		0		(42	)		658
		40,691		56		(379	)		40,368
Total	$	287,966		734		(2,935	)		285,765

Schedule of Unrealized Loss on Investments [Table Text Block]

	Less Than Twelve Months							Twelve Months or More							Total
(Dollars in thousands)	# of Investments		Fair Value		Unrealized Losses			# of Investments		Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
December 31, 2022
Mortgage backed securities:
FNMA		12	$	19,337		(1,629	)		22	$	85,599		(11,125	)	$	104,936		(12,754	)
FHLMC		4		10,542		(1,214	)		20		77,174		(9,963	)		87,716		(11,177	)
Collateralized mortgage obligations:
FNMA		1		36		(2	)		0		0		0			36		(2	)
Other marketable securities:
U.S. government and agency obligations		4		19,334		(667	)		7		33,507		(1,490	)		52,841		(2,157	)
Corporate preferred stock		0		0		0			1		490		(210	)		490		(210	)
Total		21	$	49,249		(3,512	)		50	$	196,770		(22,788	)	$	246,019		(26,300	)
December 31, 2021
Mortgage backed securities:
FNMA		19	$	98,423		(1,234	)		2	$	6,810		(133	)	$	105,233		(1,367	)
FHLMC		17		85,624		(1,038	)		2		7,664		(151	)		93,288		(1,189	)
Other marketable securities:
U.S. government and agency obligations		7		34,659		(337	)		0		0		0			34,659		(337	)
Corporate preferred stock		0		0		0			1		658		(42	)		658		(42	)
Total		43	$	218,706		(2,609	)		5	$	15,132		(326	)	$	233,838		(2,935	)

Available-for-Sale Securities [Member]

Notes Tables

Contractual Obligation, Fiscal Year Maturity [Table Text Block]

(Dollars in thousands)	Amortized Cost		Fair Value
Due one year or less	$	67,917		61,838
Due after one year through five years		156,729		141,907
Due after five years through fifteen years		47,670		42,271
Due after fifteen years		3		3
Total	$	272,319		246,019