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Note 2 - Securities (Tables)

9 Months Ended

Sep. 30, 2024

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, 2024
U.S. Government agency debt obligations		$	505,005			$	1,823			$	(37,507	)		$	469,321
Mortgage-backed securities			32,549				15				(4,964	)			27,600
Municipal general obligation bonds			180,326				1,778				(5,259	)			176,845
Municipal revenue bonds			30,710				234				(1,835	)			29,109
Other investments			500				0				0				500
		$	749,090			$	3,850			$	(49,565	)		$	703,375
December 31, 2023
U.S. Government agency debt obligations		$	442,496			$	0			$	(52,000	)		$	390,496
Mortgage-backed securities			35,168				20				(5,715	)			29,473
Municipal general obligation bonds			172,126				1,924				(6,190	)			167,860
Municipal revenue bonds			30,708				262				(2,207	)			28,763
Other investments			500				0				0				500
		$	680,998			$	2,206			$	(66,112	)		$	617,092

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, 2024
U.S. Government agency debt obligations		$	10,962			$	7			$	383,485			$	37,500			$	394,447			$	37,507
Mortgage-backed securities			0				0				26,969				4,964				26,969				4,964
Municipal general obligation bonds			0				0				101,811				5,259				101,811				5,259
Municipal revenue bonds			0				0				20,919				1,835				20,919				1,835
Other investments			0				0				0				0				0				0
		$	10,962			$	7			$	533,184			$	49,558			$	544,146			$	49,565

		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, 2023
U.S. Government agency debt obligations		$	0			$	0			$	390,496			$	52,000			$	390,496			$	52,000
Mortgage-backed securities			114				0				28,749				5,715				28,863				5,715
Municipal general obligation bonds			1,109				6				106,171				6,184				107,280				6,190
Municipal revenue bonds			1,506				8				20,602				2,199				22,108				2,207
Other investments			0				0				0				0				0				0
		$	2,729			$	14			$	546,018			$	66,098			$	548,747			$	66,112

Investments Classified by Contractual Maturity Date [Table Text Block]

		Amortized				Fair
(Dollars in thousands)		Cost				Value
Due in 2024		$	24,401			$	24,285
Due in 2025 through 2029			364,674				346,444
Due in 2030 through 2034			281,530				259,028
Due in 2035 and beyond			45,436				45,518
Mortgage-backed securities			32,549				27,600
Other investments			500				500
Total available for sale securities		$	749,090			$	703,375

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