Note 3 - Investment Securities (Tables)

3 Months Ended

Mar. 31, 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)
March 31, 2024
Investment securities available-for-sale:
Federal agency obligations	$	76,953	$	190	$	(11,411	)	$	65,732	$	-
Residential mortgage pass-through securities		454,980		289		(58,848	)		396,421		-
Commercial mortgage pass-through securities		25,178		-		(3,740	)		21,438		-
Obligations of U.S. states and political subdivisions		147,553		166		(18,163	)		129,556		-
Corporate bonds and notes		5,000		-		(29	)		4,971		-
Asset-backed securities		1,167		-		(15	)		1,152		-
Other securities		127		-		-			127		-
Total investment securities available-for-sale	$	710,958	$	645	$	(92,206	)	$	619,397	$	-
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]

	March 31, 2024
	Amortized		Fair
	Cost		Value
	(dollars in thousands)
Investment securities available-for-sale:
Due in one year or less	$	2,284	$	2,269
Due after one year through five years		6,362		6,338
Due after five years through ten years		2,283		2,241
Due after ten years		219,744		190,563
Residential mortgage pass-through securities		454,980		396,421
Commercial mortgage pass-through securities		25,178		21,438
Other securities		127		127
Total investment securities available-for-sale	$	710,958	$	619,397

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

	March 31, 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	$	49,276	$	(11,411	)	$	11,597	$	(93	)	$	37,679	$	(11,318	)
Residential mortgage pass-through securities		368,077		(58,848	)		3,345		(77	)		364,732		(58,771	)
Commercial mortgage pass-through securities		21,437		(3,740	)		-		-			21,437		(3,740	)
Obligations of U.S. states and political subdivisions		118,304		(18,163	)		19,806		(389	)		98,498		(17,774	)
Corporate bonds and notes		4,972		(29	)		2,987		(14	)		1,985		(15	)
Asset-backed securities		1,153		(15	)		-		-			1,153		(15	)
Total temporarily impaired securities	$	563,219	$	(92,206	)	$	37,735	$	(573	)	$	525,484	$	(91,633	)

	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	)