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Note 2 - Securities (Tables)

9 Months Ended

Sep. 30, 2025

Notes Tables

Debt Securities, Available-for-Sale [Table Text Block]

						Gross				Gross
		Amortized				Unrealized				Unrealized				Fair
(Dollars in thousands)		Cost				Gains				Losses				Value
September 30, 2025
U.S. Government agency debt obligations		$	632,999			$	3,356			$	(29,573	)		$	606,782
Mortgage-backed securities			28,527				12				(4,866	)			23,673
Municipal general obligation bonds			196,099				1,366				(4,890	)			192,575
Municipal revenue bonds			33,103				183				(1,678	)			31,608
Other investments			500				0				0				500
		$	891,228			$	4,917			$	(41,007	)		$	855,138
December 31, 2024
U.S. Government agency debt obligations		$	542,676			$	131			$	(47,226	)		$	495,581
Mortgage-backed securities			31,696				4				(6,332	)			25,368
Municipal general obligation bonds			187,484				513				(7,827	)			180,170
Municipal revenue bonds			31,066				89				(2,422	)			28,733
Other investments			500				0				0				500
		$	793,422			$	737			$	(63,807	)		$	730,352

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

		Less than 12 Months								12 Months or More								Total
		Fair				Unrealized				Fair				Unrealized				Fair				Unrealized
(Dollars in thousands)		Value				Loss				Value				Loss				Value				Loss
September 30, 2025
U.S. Government agency debt obligations		$	23,431			$	98			$	347,556			$	29,475			$	370,987			$	29,573
Mortgage-backed securities			22				0				23,138				4,866				23,160				4,866
Municipal general obligation bonds			32,869				565				87,987				4,325				120,856				4,890
Municipal revenue bonds			2,343				18				20,035				1,660				22,378				1,678
Other investments			0				0				0				0				0				0
		$	58,665			$	681			$	478,716			$	40,326			$	537,381			$	41,007

		Less than 12 Months								12 Months or More								Total
		Fair				Unrealized				Fair				Unrealized				Fair				Unrealized
(Dollars in thousands)		Value				Loss				Value				Loss				Value				Loss
December 31, 2024
U.S. Government agency debt obligations		$	113,942			$	2,379			$	361,171			$	44,847			$	475,113			$	47,226
Mortgage-backed securities			194				1				24,865				6,331				25,059				6,332
Municipal general obligation bonds			63,387				1,117				92,153				6,710				155,540				7,827
Municipal revenue bonds			2,840				28				21,865				2,394				24,705				2,422
Other investments			0				0				0				0				0				0
		$	180,363			$	3,525			$	500,054			$	60,282			$	680,417			$	63,807

Investments Classified by Contractual Maturity Date [Table Text Block]

		Amortized				Fair
(Dollars in thousands)		Cost				Value
Due in 2025		$	16,400			$	16,336
Due in 2026 through 2030			499,573				482,797
Due in 2031 through 2035			289,744				275,318
Due in 2036 and beyond			56,484				56,514
Mortgage-backed securities			28,527				23,673
Other investments			500				500
Total available for sale securities		$	891,228			$	855,138

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