Note 4 - Investment Securities (Tables)

9 Months Ended

Sep. 30, 2023

Notes Tables

Schedule of Available for Sale Securities, and Held to Maturity [Table Text Block]

			Gross		Gross
(dollars in thousands)	Amortized		Unrealized		Unrealized			Fair
September 30, 2023	Cost		Gains		Losses			Value
Available for sale
Government agency securities	$	8,694	$	—	$	(800	)	$	7,894
SBA agency securities		7,533		—		(272	)		7,261
Mortgage-backed securities: residential		41,501		—		(8,064	)		33,437
Collateralized mortgage obligations: residential		86,343		—		(15,144	)		71,199
Collateralized mortgage obligations: commercial		70,837		1		(3,343	)		67,495
Commercial paper		129,105		—		(32	)		129,073
Corporate debt securities		34,817		—		(5,011	)		29,806
Municipal securities		12,644		—		(4,431	)		8,213
Total	$	391,474	$	1	$	(37,097	)	$	354,378
Held to maturity
Municipal taxable securities	$	502	$	—	$	(3	)	$	499
Municipal securities		4,712		—		(461	)		4,251
Total	$	5,214	$	—	$	(464	)	$	4,750

			Gross		Gross
(dollars in thousands)	Amortized		Unrealized		Unrealized			Fair
December 31, 2022	Cost		Gains		Losses			Value
Available for sale
Government agency securities	$	5,012	$	—	$	(517	)	$	4,495
SBA agency securities		2,634		—		(223	)		2,411
Mortgage-backed securities: residential		44,809		—		(6,752	)		38,057
Mortgage-backed securities: commercial		4,887		—		(16	)		4,871
Collateralized mortgage obligations: residential		82,759		—		(12,856	)		69,903
Collateralized mortgage obligations: commercial		44,591		—		(2,901	)		41,690
Commercial paper		49,551		2		(16	)		49,537
Corporate debt securities		41,176		1		(4,165	)		37,012
Municipal securities		12,669		—		(3,815	)		8,854
Total	$	288,088	$	3	$	(31,261	)	$	256,830
Held to maturity
Municipal taxable securities	$	1,003	$	7	$	(3	)	$	1,007
Municipal securities		4,726		—		(170	)		4,556
Total	$	5,729	$	7	$	(173	)	$	5,563

Investments Classified by Contractual Maturity Date [Table Text Block]

	Less than One Year				More than One Year to Five Years				More than Five Years to Ten Years				More than Ten Years				Total
	Amortized				Amortized				Amortized				Amortized				Amortized
(dollars in thousands)	Cost		Fair Value		Cost		Fair Value		Cost		Fair Value		Cost		Fair Value		Cost		Fair Value
September 30, 2023
Government agency securities	$	—	$	—	$	8,694	$	7,894	$	—	$	—	$	—	$	—	$	8,694	$	7,894
SBA agency securities		—		—		2,387		2,115		5,146		5,146		—		—		7,533		7,261
Mortgage-backed securities: residential		—		—		11,546		10,028		20,114		16,164		9,841		7,245		41,501		33,437
Collateralized mortgage obligations: residential		—		—		23,737		22,217		58,783		46,416		3,823		2,566		86,343		71,199
Collateralized mortgage obligations: commercial		3,173		3,163		22,470		20,230		45,194		44,102		—		—		70,837		67,495
Commercial paper		129,105		129,073		—		—		—		—		—		—		129,105		129,073
Corporate debt securities		—		—		12,919		12,225		19,253		15,822		2,645		1,759		34,817		29,806
Municipal securities		—		—		—		—		—		—		12,644		8,213		12,644		8,213
Total available for sale	$	132,278	$	132,236	$	81,753	$	74,709	$	148,490	$	127,650	$	28,953	$	19,783	$	391,474	$	354,378
Municipal taxable securities	$	—	$	—	$	502	$	499	$	—	$	—	$	—	$	—	$	502	$	499
Municipal securities		—		—		—		—		2,338		2,085		2,374		2,166		4,712		4,251
Total held to maturity	$	—	$	—	$	502	$	499	$	2,338	$	2,085	$	2,374	$	2,166	$	5,214	$	4,750
(dollars in thousands)
December 31, 2022
Government agency securities	$	—	$	—	$	5,012	$	4,495	$	—	$	—	$	—	$	—	$	5,012	$	4,495
SBA agency securities		—		—		2,634		2,411		—		—		—		—		2,634		2,411
Mortgage-backed securities: residential		—		—		13,013		11,598		29,114		24,361		2,682		2,098		44,809		38,057
Mortgage-backed securities: commercial		—		—		4,887		4,871		—		—		—		—		4,887		4,871
Collateralized mortgage obligations: residential		—		—		20,687		19,646		62,072		50,257		—		—		82,759		69,903
Collateralized mortgage obligations: commercial		—		—		16,382		14,644		28,209		27,046		—		—		44,591		41,690
Commercial paper		49,551		49,537		—		—		—		—		—		—		49,551		49,537
Corporate debt securities		3,705		3,706		11,355		10,806		23,454		20,662		2,662		1,838		41,176		37,012
Municipal securities		—		—		—		—		—		—		12,669		8,854		12,669		8,854
Total available for sale	$	53,256	$	53,243	$	73,970	$	68,471	$	142,849	$	122,326	$	18,013	$	12,790	$	288,088	$	256,830
Municipal taxable securities	$	501	$	498	$	502	$	509	$	—	$	—	$	—	$	—	$	1,003	$	1,007
Municipal securities		—		—		—		—		1,739		1,692		2,987		2,864		4,726		4,556
Total held to maturity	$	501	$	498	$	502	$	509	$	1,739	$	1,692	$	2,987	$	2,864	$	5,729	$	5,563

Schedule of Unrealized Loss on Investments [Table Text Block]

	Less than Twelve Months					Twelve Months or More					Total
(dollars in thousands)	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
September 30, 2023
Government agency securities	$	4,119	$	(174	)	$	3,775	$	(626	)	$	7,894	$	(800	)
SBA securities		—		—			2,115		(272	)		2,115		(272	)
Mortgage-backed securities: residential		—		—			33,437		(8,064	)		33,437		(8,064	)
Collateralized mortgage obligations: residential		11,956		(310	)		59,243		(14,834	)		71,199		(15,144	)
Collateralized mortgage obligations: commercial		23,696		(121	)		38,800		(3,222	)		62,496		(3,343	)
Commercial paper		114,185		(32	)		—		—			114,185		(32	)
Corporate debt securities		—		—			29,806		(5,011	)		29,806		(5,011	)
Municipal securities		—		—			8,213		(4,431	)		8,213		(4,431	)
Total available for sale	$	153,956	$	(637	)	$	175,389	$	(36,460	)	$	329,345	$	(37,097	)
Municipal taxable securities	$	499	$	(3	)	$	—	$	—		$	499	$	(3	)
Municipal securities		1,281		(134	)		2,970		(327	)		4,251		(461	)
Total held to maturity	$	1,780	$	(137	)	$	2,970	$	(327	)	$	4,750	$	(464	)

	Less than Twelve Months					Twelve Months or More					Total
(dollars in thousands)	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
December 31, 2022
Government agency securities	$	354	$	(24	)	$	4,141	$	(493	)	$	4,495	$	(517	)
SBA securities		2,411		(223	)		—		—			2,411		(223	)
Mortgage-backed securities: residential		5,535		(362	)		32,522		(6,390	)		38,057		(6,752	)
Mortgage-backed securities: commercial		4,871		(16	)		—		—			4,871		(16	)
Collateralized mortgage obligations: residential		27,050		(1,842	)		39,815		(11,014	)		66,865		(12,856	)
Collateralized mortgage obligations: commercial		18,741		(790	)		22,949		(2,111	)		41,690		(2,901	)
Commercial paper		39,624		(16	)		—		—			39,624		(16	)
Corporate debt securities		22,977		(1,843	)		10,330		(2,322	)		33,307		(4,165	)
Municipal securities		—		—			8,854		(3,815	)		8,854		(3,815	)
Total available for sale	$	121,563	$	(5,116	)	$	118,611	$	(26,145	)	$	240,174	$	(31,261	)
Municipal taxable securities	$	498	$	(3	)	$	—	$	—		$	498	$	(3	)
Municipal securities		4,556		(170	)		—		—			4,556		(170	)
Total held to maturity	$	5,054	$	(173	)	$	—	$	—		$	5,054	$	(173	)