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Note 2 - Securities (Tables)

6 Months Ended

Jun. 30, 2021

Notes Tables

Available-for-sale Securities [Table Text Block]

		Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Fair Value
June 30, 2021
U.S. Government agency debt obligations		$	323,641,000			$	423,000			$	(3,923,000	)		$	320,141,000
Mortgage-backed securities			36,803,000				813,000				(297,000	)			37,319,000
Municipal general obligation bonds			124,808,000				4,754,000				(127,000	)			129,435,000
Municipal revenue bonds			18,467,000				363,000				(100,000	)			18,730,000
Other investments			500,000				0				0				500,000
		$	504,219,000			$	6,353,000			$	(4,447,000	)		$	506,125,000
December 31, 2020
U.S. Government agency debt obligations		$	242,522,000			$	516,000			$	(897,000	)		$	242,141,000
Mortgage-backed securities			23,869,000				1,021,000				0				24,890,000
Municipal general obligation bonds			101,991,000				5,833,000				0				107,824,000
Municipal revenue bonds			11,521,000				473,000				(2,000	)			11,992,000
Other investments			500,000				0				0				500,000
		$	380,403,000			$	7,843,000			$	(899,000	)		$	387,347,000

Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block]

		Less than 12 Months								12 Months or More								Total
		Fair Value				Unrealized Loss				Fair Value				Unrealized Loss				Fair Value				Unrealized Loss
June 30, 2021
U.S. Government agency debt obligations		$	252,288,000			$	3,900,000			$	3,977,000			$	23,000			$	256,265,000			$	3,923,000
Mortgage-backed securities			13,972,000				297,000				0				0				13,972,000				297,000
Municipal general obligation bonds			19,301,000				127,000				0				0				19,301,000				127,000
Municipal revenue bonds			9,187,000				100,000				0				0				9,187,000				100,000
		$	294,748,000			$	4,424,000			$	3,977,000			$	23,000			$	298,725,000			$	4,447,000

		Less than 12 Months								12 Months or More								Total
		Fair Value				Unrealized Loss				Fair Value				Unrealized Loss				Fair Value				Unrealized Loss
December 31, 2020
U.S. Government agency debt obligations		$	118,650,000			$	897,000			$	0			$	0			$	118,650,000			$	897,000
Mortgage-backed securities			0				0				0				0				0				0
Municipal general obligation bonds			0				0				0				0				0				0
Municipal revenue bonds			423,000				2,000				0				0				423,000				2,000
		$	119,073,000			$	899,000			$	0			$	0			$	119,073,000			$	899,000

Investments Classified by Contractual Maturity Date [Table Text Block]

		Weighted Average Yield				Amortized Cost				Fair Value
Due in 2021			3.29%			$	881,000			$	886,000
Due in 2022 through 2026			1.06				172,553,000				173,442,000
Due in 2027 through 2031			1.60				234,940,000				235,320,000
Due in 2032 and beyond			2.03				58,542,000				58,658,000
Mortgage-backed securities			1.83				36,803,000				37,319,000
Other investments			3.75				500,000				500,000
Total available for sale securities			1.49%			$	504,219,000			$	506,125,000

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Tabular disclosure of fair value of investments in debt and equity securities in an unrealized loss position categorized neither as held-to-maturity nor trading securities.

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