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Note 2 - Securities (Tables)

6 Months Ended

Jun. 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
June 30, 2025
U.S. Government agency debt obligations		$	618,717			$	2,273			$	(33,319	)		$	587,671
Mortgage-backed securities			29,893				10				(5,523	)			24,380
Municipal general obligation bonds			188,931				548				(7,361	)			182,118
Municipal revenue bonds			33,646				129				(2,029	)			31,746
Other investments			500				0				0				500
		$	871,687			$	2,960			$	(48,232	)		$	826,415
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
June 30, 2025
U.S. Government agency debt obligations		$	49,087			$	454			$	359,282			$	32,865			$	408,369			$	33,319
Mortgage-backed securities			0				0				23,848				5,523				23,848				5,523
Municipal general obligation bonds			38,247				1,449				108,089				5,912				146,336				7,361
Municipal revenue bonds			2,985				41				22,586				1,988				25,571				2,029
Other investments			0				0				0				0				0				0
		$	90,319			$	1,944			$	513,805			$	46,288			$	604,124			$	48,232

		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		$	33,462			$	33,137
Due in 2026 through 2030			480,202				460,372
Due in 2031 through 2035			277,229				259,053
Due in 2036 and beyond			50,401				48,973
Mortgage-backed securities			29,893				24,380
Other investments			500				500
Total available for sale securities		$	871,687			$	826,415

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