Note 3 - Investment Securities (Tables)

3 Months Ended

Mar. 31, 2023

Notes Tables

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

										Allowance
										for
			Gross		Gross					Investment
	Amortized		Unrealized		Unrealized			Fair		Credit
	Cost		Gains		Losses			Value		Losses
	(dollars in thousands)
March 31, 2023
Investment securities available-for-sale:
Federal agency obligations	$	53,301	$	1	$	(9,787	)	$	43,515	$	-
Residential mortgage pass-through securities		469,925		322		(50,580	)		419,667		-
Commercial mortgage pass-through securities		25,424		-		(3,464	)		21,960		-
Obligations of U.S. states and political subdivisions		155,101		255		(17,060	)		138,296		-
Corporate bonds and notes		4,000		-		(23	)		3,977		-
Asset-backed securities		1,505		-		(51	)		1,454		-
Other securities		132		-		-			132		-
Total securities available-for-sale	$	709,388	$	578	$	(80,965	)	$	629,001	$	-
December 31, 2022
Investment securities available-for-sale:
Federal agency obligations	$	54,889	$	-	$	(10,439	)	$	44,450	$	-
Residential mortgage pass-through securities		475,263		178		(57,863	)		417,578		-
Commercial mortgage pass-through securities		25,485		-		(4,381	)		21,104		-
Obligations of U.S. states and political subdivisions		157,247		111		(14,462	)		142,896		-
Corporate bonds and notes		7,000		-		(26	)		6,974		-
Asset-backed securities		1,673		-		(33	)		1,640		-
Other securities		242		-		-			242		-
Total securities available-for-sale	$	721,799	$	289	$	(87,204	)	$	634,884	$	-

Investments Classified by Contractual Maturity Date [Table Text Block]

	March 31, 2023
	Amortized		Fair
	Cost		Value
	(dollars in thousands)
Investment securities available-for-sale:
Due in one year or less	$	2,453	$	2,453
Due after one year through five years		4,079		4,057
Due after five years through ten years		2,626		2,620
Due after ten years		204,749		178,112
Residential mortgage pass-through securities		469,925		419,667
Commercial mortgage pass-through securities		25,424		21,960
Other securities		132		132
Total securities available-for-sale	$	709,388	$	629,001

Schedule of Unrealized Loss on Investments [Table Text Block]

	March 31, 2023
	Total					Less than 12 Months					12 Months or Longer
	Fair		Unrealized			Fair		Unrealized			Fair		Unrealized
	Value		Losses			Value		Losses			Value		Losses
	(dollars in thousands)
Investment securities available-for-sale:
Federal agency obligations	$	43,301	$	(9,787	)	$	2,798	$	(209	)	$	40,503	$	(9,578	)
Residential mortgage pass-through securities		404,073		(50,580	)		153,706		(4,627	)		250,367		(45,953	)
Commercial mortgage pass-through securities		21,960		(3,464	)		6,540		(460	)		15,420		(3,004	)
Obligations of U.S. states and political subdivisions		118,428		(17,060	)		26,397		(1,194	)		92,031		(15,866	)
Corporate bonds and notes		1,977		(23	)		1,977		(23	)		-		-
Asset-backed securities		1,454		(51	)		390		(21	)		1,064		(30	)
Total temporarily impaired securities	$	591,193	$	(80,965	)	$	191,808	$	(6,534	)	$	399,385	$	(74,431	)

	December 31, 2022
	Total					Less than 12 Months					12 Months or Longer
	Fair		Unrealized			Fair		Unrealized			Fair		Unrealized
	Value		Losses			Value		Losses			Value		Losses
	(dollars in thousands)
Investment securities available-for-sale:
Federal agency obligations	$	44,451	$	(10,439	)	$	20,517	$	(1,831	)	$	23,934	$	(8,608	)
Residential mortgage pass-through securities		403,039		(57,863	)		218,918		(13,869	)		184,121		(43,994	)
Commercial mortgage pass-through securities		21,105		(4,381	)		14,523		(2,304	)		6,582		(2,077	)
Obligations of U.S. states and political subdivisions		133,265		(14,462	)		47,446		(3,404	)		85,819		(11,058	)
Corporate bonds and notes		4,973		(26	)		4,973		(26	)		-		-
Asset-backed securities		1,640		(33	)		1,048		(16	)		592		(17	)
Total temporarily impaired securities	$	608,473	$	(87,204	)	$	307,425	$	(21,450	)	$	301,048	$	(65,754	)