Note 3 - Investment Securities (Tables)

6 Months Ended

Jun. 30, 2024

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, 2024
Investment securities available-for-sale:
Federal agency obligations	$	93,088	$	205	$	(11,918	)	$	81,375	$	-
Residential mortgage pass-through securities		446,631		148		(60,787	)		385,992		-
Commercial mortgage pass-through securities		25,115		-		(3,697	)		21,418		-
Obligations of U.S. states and political subdivisions		145,574		73		(19,977	)		125,670		-
Corporate bonds and notes		5,000		-		(22	)		4,978		-
Asset-backed securities		1,012		-		(12	)		1,000		-
Other securities		146		-		-			146		-
Total investment securities available-for-sale	$	716,566	$	426	$	(96,413	)	$	620,579	$	-
December 31, 2023
Investment securities available-for-sale:
Federal agency obligations	$	55,898	$	189	$	(10,761	)	$	45,326	$	-
Residential mortgage pass-through securities		462,004		620		(51,433	)		411,191		-
Commercial mortgage pass-through securities		25,240		-		(3,676	)		21,564		-
Obligations of U.S. states and political subdivisions		148,795		415		(16,505	)		132,705		-
Corporate bonds and notes		5,000		-		(27	)		4,973		-
Asset-backed securities		1,260		-		(22	)		1,238		-
Other securities		165		-		-			165		-
Total investment securities available-for-sale	$	698,362	$	1,224	$	(82,424	)	$	617,162	$	-

Investments Classified by Contractual Maturity Date [Table Text Block]

	June 30, 2024
	Amortized		Fair
	Cost		Value
	(dollars in thousands)
Investment securities available-for-sale:
Due in one year or less	$	2,284	$	2,279
Due after one year through five years		6,300		6,248
Due after five years through ten years		2,223		2,161
Due after ten years		233,867		202,335
Residential mortgage pass-through securities		446,631		385,992
Commercial mortgage pass-through securities		25,115		21,418
Other securities		146		146
Total investment securities available-for-sale	$	716,566	$	620,579

Unrealized Gain (Loss) on Investments [Table Text Block]

	June 30, 2024
	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	$	57,109	$	(11,918	)	$	19,579	$	(129	)	$	37,530	$	(11,789	)
Residential mortgage pass-through securities		373,145		(60,787	)		15,527		(92	)		357,618		(60,695	)
Commercial mortgage pass-through securities		21,419		(3,697	)		-		-			21,419		(3,697	)
Obligations of U.S. states and political subdivisions		114,985		(19,977	)		20,002		(558	)		94,983		(19,419	)
Corporate bonds and notes		4,978		(22	)		2,984		(16	)		1,994		(6	)
Asset-backed securities		1,001		(12	)		-		-			1,001		(12	)
Total temporarily impaired securities	$	572,637	$	(96,413	)	$	58,092	$	(795	)	$	514,545	$	(95,618	)

	December 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	$	40,779	$	(10,761	)	$	1,689	$	(65	)	$	39,090	$	(10,696	)
Residential mortgage pass-through securities		382,042		(51,433	)		4,138		(51	)		377,904		(51,382	)
Commercial mortgage pass-through securities		21,565		(3,676	)		-		-			21,565		(3,676	)
Obligations of U.S. states and political subdivisions		101,189		(16,505	)		1,340		(7	)		99,849		(16,498	)
Corporate bonds and notes		4,973		(27	)		2,993		(7	)		1,980		(20	)
Asset-backed securities		1,238		(22	)		-		-			1,238		(22	)
Total temporarily impaired securities	$	551,786	$	(82,424	)	$	10,160	$	(130	)	$	541,626	$	(82,294	)