Note 4 - Investment Securities (Tables)

9 Months Ended

Sep. 30, 2025

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, 2025
Investment securities available-for-sale:
Federal agency obligations	$	406,606	$	2,636	$	(10,114	)	$	399,128	$	-
Residential mortgage pass-through securities		649,730		4,026		(45,857	)		607,899		-
Commercial mortgage pass-through securities		30,180		-		(3,373	)		26,807		-
Obligations of U.S. states and political subdivisions		223,707		4,008		(15,950	)		211,765		-
Corporate bonds and notes		6,000		-		(1	)		5,999		-
Asset-backed securities		551		1		(2	)		550		-
Other securities		54		-		-			54		-
Total investment securities available-for-sale	$	1,316,828	$	10,671	$	(75,297	)	$	1,252,202	$	-

December 31, 2024
Investment securities available-for-sale:
Federal agency obligations	$	96,165	$	179	$	(11,674	)	$	84,670	$	-
Residential mortgage pass-through securities		439,445		211		(60,818	)		378,838		-
Commercial mortgage pass-through securities		24,989		-		(4,097	)		20,892		-
Obligations of U.S. states and political subdivisions		141,775		89		(19,460	)		122,404		-
Corporate bonds and notes		5,000		5		(18	)		4,987		-
Asset-backed securities		892		-		(7	)		885		-
Other securities		171		-		-			171		-
Total investment securities available-for-sale	$	708,437	$	484	$	(96,074	)	$	612,847	$	-

Investments Classified by Contractual Maturity Date [Table Text Block]

	September 30, 2025
	Amortized		Fair
	Cost		Value
	(dollars in thousands)
Investment securities available-for-sale:
Due in one year or less	$	5,557	$	5,558
Due after one year through five years		26,255		26,784
Due after five years through ten years		61,179		61,995
Due after ten years		543,873		523,105
Residential mortgage pass-through securities		649,730		607,899
Commercial mortgage pass-through securities		30,180		26,807
Other securities		54		54
Total investment securities available-for-sale	$	1,316,828	$	1,252,202

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

	September 30, 2025
	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	$	140,370	$	(10,114	)	$	106,573	$	(484	)	$	33,797	$	(9,630	)
Residential mortgage pass-through securities		343,660		(45,857	)		8,843		(49	)		334,817		(45,808	)
Commercial mortgage pass-through securities		26,807		(3,373	)		5,422		(42	)		21,385		(3,331	)
Obligations of U.S. states and political subdivisions		108,288		(15,950	)		10,867		(248	)		97,421		(15,702	)
Corporate bonds and notes		3,999		(1	)		3,999		(1	)		-		-
Asset-backed securities		293		(2	)		-		-			293		(2	)
Total investment securities available for sale	$	623,417	$	(75,297	)	$	135,704	$	(824	)	$	487,713	$	(74,473	)

	December 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	$	53,467	$	(11,674	)	$	18,471	$	(60	)	$	34,996	$	(11,614	)
Residential mortgage pass-through securities		364,971		(60,818	)		26,809		(604	)		338,162		(60,214	)
Commercial mortgage pass-through securities		20,892		(4,097	)		-		-			20,892		(4,097	)
Obligations of U.S. states and political subdivisions		112,523		(19,460	)		13,281		(322	)		99,242		(19,138	)
Corporate bonds and notes		1,982		(18	)		1,982		(18	)		-		-
Asset-backed securities		885		(7	)		-		-			885		(7	)
Total investment securities available for sale	$	554,720	$	(96,074	)	$	60,543	$	(1,004	)	$	494,177	$	(95,070	)

- Definition

Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-9

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (aa)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (aaa)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

+ Details

ConnectOne Bancorp, Inc. 10-Q