Note 4 - Investment Securities (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Schedule of Available-for-Sale Securities Reconciliation [Table Text Block]

(in thousands)	Amortized		Unrealized
December 31, 2023	cost		Gains		Losses			Fair value
U.S. Treasury and other U.S. Government obligations	$	119,931	$	-	$	(3,662	)	$	116,269
Government sponsored enterprise obligations		104,677		157		(4,987	)		99,847
Mortgage backed securities - government agencies		789,145		83		(101,189	)		688,039
Obligations of states and political subdivisions		136,579		5		(13,094	)		123,490
Other		3,821		-		(287	)		3,534
Total available for sale debt securities	$	1,154,153	$	245	$	(123,219	)	$	1,031,179
December 31, 2022
U.S. Treasury and other U.S. Government obligations	$	122,966	$	-	$	(7,927	)	$	115,039
Government sponsored enterprise obligations		149,773		290		(6,437	)		143,626
Mortgage backed securities - government agencies		874,265		58		(121,585	)		752,738
Obligations of states and political subdivisions		145,016		1		(17,418	)		127,599
Other		5,957		-		(342	)		5,615
Total available for sale debt securities	$	1,297,977	$	349	$	(153,709	)	$	1,144,617

Debt Securities, Held-to-Maturity [Table Text Block]

(in thousands)	Carrying		Unrecognized
December 31, 2023	value		Gains		Losses			Fair value
U.S. Treasury and other U.S. Government obligations	$	203,259	$	-	$	(4,932	)	$	198,327
Government sponsored enterprise obligations		26,918		-		(2,457	)		24,461
Mortgage backed securities - government agencies		209,660		1		(23,930	)		185,731
Total held to maturity debt securities	$	439,837	$	1	$	(31,319	)	$	408,519
December 31, 2022
U.S. Treasury and other U.S. Government obligations	$	217,794	$	-	$	(9,166	)	$	208,628
Government sponsored enterprise obligations		27,507		-		(2,559	)		24,948
Mortgage backed securities - government agencies		227,916		-		(29,659	)		198,257
Total held to maturity debt securities	$	473,217	$	-	$	(41,384	)	$	431,833

Investments Classified by Contractual Maturity Date [Table Text Block]

	AFS Debt Securities				HTM Debt Securities
(in thousands)	Amortized cost		Fair value		Carrying value		Fair value
Due within one year	$	128,053	$	124,318	$	50,069	$	49,647
Due after one year but within five years		36,480		34,673		153,931		149,393
Due after five years but within 10 years		81,862		72,415		25,633		23,214
Due after 10 years		118,613		111,734		544		534
Mortgage backed securities - government agencies		789,145		688,039		209,660		185,731
Total	$	1,154,153	$	1,031,179	$	439,837	$	408,519

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

	AFS Debt Securities
	Less than 12 months					12 months or more					Total
(in thousands)	Fair		Unrealized			Fair		Unrealized			Fair		Unrealized
December 31, 2023	value		losses			value		losses			value		losses
U.S. Treasury and other U.S. Government obligations	$	-	$	-		$	116,269	$	(3,662	)	$	116,269	$	(3,662	)
Government sponsored enterprise obligations		-		-			83,675		(4,987	)		83,675		(4,987	)
Mortgage-backed securities - government agencies		16,346		(95	)		661,195		(101,094	)		677,541		(101,189	)
Obligations of states and political subdivisions		6,326		(64	)		105,179		(13,030	)		111,505		(13,094	)
Other		-		-			3,534		(287	)		3,534		(287	)
Total AFS debt securities	$	22,672	$	(159	)	$	969,852	$	(123,060	)	$	992,524	$	(123,219	)
December 31, 2022
U.S. Treasury and other U.S. Government obligations	$	3,025	$	(57	)	$	111,966	$	(7,870	)	$	114,991	$	(7,927	)
Government sponsored enterprise obligations		99,785		(3,553	)		22,484		(2,884	)		122,269		(6,437	)
Mortgage-backed securities - government agencies		180,263		(11,114	)		567,988		(110,471	)		748,251		(121,585	)
Obligations of states and political subdivisions		64,165		(3,763	)		56,864		(13,655	)		121,029		(17,418	)
Other		4,865		(213	)		749		(129	)		5,614		(342	)
Total AFS debt securities	$	352,103	$	(18,700	)	$	760,051	$	(135,009	)	$	1,112,154	$	(153,709	)

	HTM Debt Securities
	Less than 12 months					12 months or more					Total
(in thousands)	Fair		Unrecognized			Fair		Unrecognized			Fair		Unrecognized
December 31, 2023	value		losses			value		losses			value		losses
U.S. Treasury and other U.S. Government obligations	$	-	$	-		$	198,327	$	(4,932	)	$	198,327	$	(4,932	)
Government sponsored enterprise obligations		455		(1	)		23,967		(2,456	)		24,422		(2,457	)
Mortgage-backed securities - government agencies		-		-			185,504		(23,930	)		185,504		(23,930	)
Total HTM debt securities	$	455	$	(1	)	$	407,798	$	(31,318	)	$	408,253	$	(31,319	)
December 31, 2022
U.S. Treasury and other U.S. Government obligations	$	208,628	$	(9,166	)	$	-	$	-		$	208,628	$	(9,166	)
Government sponsored enterprise obligations		24,948		(2,559	)		-		-			24,948		(2,559	)
Mortgage-backed securities - government agencies		198,257		(29,659	)		-		-			198,257		(29,659	)
Total HTM debt securities	$	431,833	$	(41,384	)	$	-	$	-		$	431,833	$	(41,384	)