Note 3 - Investment Securities (Tables)

3 Months Ended

Mar. 31, 2023

Notes Tables

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

(in thousands)	Amortized		Unrealized
March 31, 2023	cost		Gains		Losses				Fair value
U.S. Treasury and other U.S. Government obligations	$	122,752	$	-	$	(6,464	)	$	116,288
Government sponsored enterprise obligations		142,900		75		(5,196	)		137,779
Mortgage backed securities - government agencies		851,879		-		(108,424	)		743,455
Obligations of states and political subdivisions		142,901		-		(14,176	)		128,725
Other		5,924		-		(319	)		5,605
Total available for sale debt securities	$	1,266,356	$	75	$	(134,579	)	$	1,131,852
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
March 31, 2023	value		Gains		Losses				Fair value
U.S. Treasury and other U.S. Government obligations	$	217,906	$	-	$	(7,065	)	$	210,841
Government sponsored enterprise obligations		27,229		-		(1,884	)		25,345
Mortgage backed securities - government agencies		223,616		-		(25,902	)		197,714
Total held to maturity debt securities	$	468,751	$	-	$	(34,851	)	$	433,900
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	$	38,238	$	37,810	$	65,167	$	63,709
Due after one year but within five years		154,856		146,932		153,365		147,726
Due after five years but within 10 years		67,697		60,871		26,014		24,170
Due after 10 years		153,686		142,784		589		581
Mortgage backed securities - government agencies		851,879		743,455		223,616		197,714
Total	$	1,266,356	$	1,131,852	$	468,751	$	433,900

Schedule of Unrealized 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
March 31, 2023	value		losses			value		losses			value		losses
U.S. Treasury and other U.S. Government obligations	$	-	$	-		$	116,288	$	(6,464	)	$	116,288	$	(6,464	)
Government sponsored enterprise obligations		43,668		(157	)		76,479		(5,039	)		120,147		(5,196	)
Mortgage-backed securities - government agencies		113,174		(3,879	)		620,688		(104,545	)		733,862		(108,424	)
Obligations of states and political subdivisions		7,312		(42	)		107,916		(14,134	)		115,228		(14,176	)
Other		-		-			5,604		(319	)		5,604		(319	)
Total AFS debt securities	$	164,154	$	(4,078	)	$	926,975	$	(130,501	)	$	1,091,129	$	(134,579	)
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
March 31, 2023	value		losses			value		losses			value		losses
U.S. Treasury and other U.S. Government obligations	$	-	$	-		$	210,841	$	(7,065	)	$	210,841	$	(7,065	)
Government sponsored enterprise obligations		1,602		(4	)		23,743		(1,880	)		25,345		(1,884	)
Mortgage-backed securities - government agencies		409		(9	)		197,305		(25,893	)		197,714		(25,902	)
Total HTM debt securities	$	2,011	$	(13	)	$	431,889	$	(34,838	)	$	433,900	$	(34,851	)
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	)