Note 3 - Investment Securities (Tables)

9 Months Ended

Sep. 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)
September 30, 2023
Investment securities available-for-sale:
Federal agency obligations	$	57,243	$	-	$	(13,274	)	$	43,969	$	-
Residential mortgage pass-through securities		466,362		-		(76,935	)		389,427		-
Commercial mortgage pass-through securities		25,303		-		(5,376	)		19,927		-
Obligations of U.S. states and political subdivisions		150,218		-		(27,319	)		122,899		-
Corporate bonds and notes		3,000		-		(39	)		2,961		-
Asset-backed securities		1,354		-		(32	)		1,322		-
Other securities		1,362		-		-			1,362		-
Total investment securities available-for-sale	$	704,842	$	-	$	(122,975	)	$	581,867	$	-
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 investment securities available-for-sale	$	721,799	$	289	$	(87,204	)	$	634,884	$	-

Investments Classified by Contractual Maturity Date [Table Text Block]

	September 30, 2023
	Amortized		Fair
	Cost		Value
	(dollars in thousands)
Investment securities available-for-sale:
Due in one year or less	$	2,000	$	1,967
Due after one year through five years		4,389		4,331
Due after five years through ten years		1,856		1,783
Due after ten years		203,570		163,070
Residential mortgage pass-through securities		466,362		389,427
Commercial mortgage pass-through securities		25,303		19,927
Other securities		1,362		1,362
Total investment securities available-for-sale	$	704,842	$	581,867

Schedule of Unrealized Loss on Investments [Table Text Block]

	September 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	$	43,969	$	(13,274	)	$	6,056	$	(194	)	$	37,913	$	(13,080	)
Residential mortgage pass-through securities		389,427		(76,935	)		28,555		(858	)		360,872		(76,077	)
Commercial mortgage pass-through securities		19,927		(5,376	)		-		-			19,927		(5,376	)
Obligations of U.S. states and political subdivisions		122,899		(27,319	)		22,739		(1,825	)		100,160		(25,494	)
Corporate bonds and notes		2,961		(39	)		994		(6	)		1,967		(33	)
Asset-backed securities		1,322		(32	)		-		-			1,322		(32	)
Total temporarily impaired securities	$	580,505	$	(122,975	)	$	58,344	$	(2,883	)	$	522,161	$	(120,092	)

	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	)