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Note 3 - Investment Securities (Tables)

9 Months Ended

Sep. 30, 2025

Notes Tables

Marketable Securities [Table Text Block]

		September 30, 2025
		Amortized				Unrealized				Unrealized				Allowance for				Fair
(dollars in thousands)		Cost				Gains				Losses				Credit Losses				Value
Available-for-sale
U.S. Treasury and agencies		$	448			$	—			$	(2	)		$	—			$	446
Mortgage backed securities
Residential agency			548,245				765				(69,173	)			—				479,837
Commercial			1,329				—				(50	)			—				1,279
Asset backed securities			16				—				—				—				16
Corporate bonds			53,183				—				(3,747	)			—				49,436
Total available-for-sale investment securities			603,221				765				(72,972	)			—				531,014
Held-to-maturity
Obligations of state and political agencies			113,485				—				(7,219	)			75				106,266
Mortgage backed securities
Residential agency			145,866				—				(21,535	)			51				124,331
Total held-to-maturity investment securities			259,351				—				(28,754	)			126				230,597
Total investment securities		$	862,572			$	765			$	(101,726	)		$	126			$	761,611

		December 31, 2024
		Amortized				Unrealized				Unrealized				Allowance for				Fair
(dollars in thousands)		Cost				Gains				Losses				Credit Losses				Value
Available-for-sale
U.S. Treasury and agencies		$	30,691			$	18			$	(2	)			—			$	30,707
Mortgage backed securities
Residential agency			596,510				1				(92,805	)			—				503,706
Commercial			1,350				—				(99	)			—				1,251
Asset backed securities			19				—				—				—				19
Corporate bonds			57,986				—				(5,616	)			—				52,370
Total available-for-sale investment securities			686,556				19				(98,522	)			—				588,053
Held-to-maturity
Obligations of state and political agencies			119,623				—				(11,638	)			77				107,985
Mortgage backed securities
Residential agency			156,093				—				(27,092	)			54				129,001
Total held-to-maturity investment securities			275,716				—				(38,730	)			131				236,986
Total investment securities		$	962,272			$	19			$	(137,252	)		$	131			$	825,039

Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block]

						September 30, 2025
						Less than 12 Months								Over 12 Months								Total
		Number of				Unrealized				Fair				Unrealized				Fair				Unrealized				Fair
(dollars in thousands)		Holdings				Losses				Value				Losses				Value				Losses				Value
Available-for-sale
U.S. Treasury and agencies			2			$	—			$	—			$	(2	)		$	446			$	(2	)		$	446
Mortgage backed securities
Residential agency			123				—				54				(69,173	)			479,783				(69,173	)			479,837
Commercial			1				—				—				(50	)			1,280				(50	)			1,280
Asset backed securities			3				—				—				—				16				—				16
Corporate bonds			11				—				—				(3,747	)			49,435				(3,747	)			49,435
Total available-for-sale investment securities			140			$	—			$	54			$	(72,972	)		$	530,960			$	(72,972	)		$	531,014

						December 31, 2024
						Less than 12 Months								Over 12 Months								Total
		Number of				Unrealized				Fair				Unrealized				Fair				Unrealized				Fair
(dollars in thousands)		Holdings				Losses				Value				Losses				Value				Losses				Value
Available-for-sale
U.S. Treasury and agencies			1			$	—			$	—			$	(2	)		$	327			$	(2	)		$	327
Mortgage backed securities
Residential agency			124				(1,715	)			116,800				(91,090	)			386,864				(92,805	)			503,664
Commercial			1				—				—				(99	)			1,251				(99	)			1,251
Asset backed securities			3				—				—				—				18				—				18
Corporate bonds			12				—				—				(5,616	)			52,370				(5,616	)			52,370
Total available-for-sale investment securities			141			$	(1,715	)		$	116,800			$	(96,807	)		$	440,830			$	(98,522	)		$	557,630

Investments Classified by Contractual Maturity Date [Table Text Block]

		Held-to-maturity								Available-for-sale
		Carrying				Fair				Amortized				Fair
(dollars in thousands)		Value				Value				Cost				Value
Due within one year or less		$	11,648			$	11,504			$	—			$	—
Due after one year through five years			57,043				54,041				4,777				4,723
Due after five years through ten years			37,390				34,026				49,998				46,254
Due after 10 years			7,404				6,695				201				200
			113,485				106,266				54,976				51,177
Mortgage-backed securities
Residential agency			145,866				124,331				548,245				479,837
Total investment securities		$	259,351			$	230,597			$	603,221			$	531,014

Investment [Table Text Block]

		September 30,				December 31,
(dollars in thousands)		2025				2024
Federal Reserve		$	8,631			$	7,519
FHLB			13,020				13,656

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