Note 3 - Investment Securities (Tables)

6 Months Ended

Jun. 30, 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)
June 30, 2023
Investment securities available-for-sale:
Federal agency obligations	$	54,102	$	-	$	(10,949	)	$	43,153	$	-
Residential mortgage pass-through securities		465,856		80		(56,810	)		409,126		-
Commercial mortgage pass-through securities		25,364		-		(4,154	)		21,210		-
Obligations of U.S. states and political subdivisions		152,614		109		(18,884	)		133,839		-
Corporate bonds and notes		4,000		-		(41	)		3,959		-
Asset-backed securities		1,422		-		(41	)		1,381		-
Other securities		151		-		-			151		-
Total securities available-for-sale	$	703,509	$	189	$	(90,879	)	$	612,819	$	-
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]

	June 30, 2023
	Amortized		Fair
	Cost		Value
	(dollars in thousands)
Investment securities available-for-sale:
Due in one year or less	$	2,000	$	2,000
Due after one year through five years		4,388		4,339
Due after five years through ten years		2,574		2,558
Due after ten years		203,176		173,435
Residential mortgage pass-through securities		465,856		409,126
Commercial mortgage pass-through securities		25,364		21,210
Other securities		151		151
Total securities available-for-sale	$	703,509	$	612,819

Schedule of Unrealized Loss on Investments [Table Text Block]

	June 30, 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	$	43,154	$	(10,949	)	$	4,565	$	(347	)	$	38,589	$	(10,602	)
Residential mortgage pass-through securities		395,195		(56,810	)		130,196		(5,818	)		264,999		(50,992	)
Commercial mortgage pass-through securities		21,210		(4,154	)		-		-			21,210		(4,154	)
Obligations of U.S. states and political subdivisions		116,310		(18,884	)		22,408		(1,320	)		93,902		(17,564	)
Corporate bonds and notes		1,959		(41	)		1,959		(41	)		-		-
Asset-backed securities		1,381		(41	)		381		(17	)		1,000		(24	)
Total temporarily impaired securities	$	579,209	$	(90,879	)	$	159,509	$	(7,543	)	$	419,700	$	(83,336	)

	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	)