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Note 2 - Securities (Tables)

3 Months Ended

Mar. 31, 2018

Notes Tables

Available-for-sale Securities [Table Text Block]

		Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Fair Value
March 31, 2018
U.S. Government agency debt obligations		$	184,422,000			$	4,000			$	(11,257,000	)		$	173,169,000
Mortgage-backed securities			41,104,000				278,000				(1,031,000	)			40,351,000
Municipal general obligation bonds			118,881,000				404,000				(1,625,000	)			117,660,000
Municipal revenue bonds			3,910,000				6,000				(73,000	)			3,843,000
Other investments			2,018,000				0				(53,000	)			1,965,000

		$	350,335,000			$	692,000			$	(14,039,000	)		$	336,988,000

December 31, 2017
U.S. Government agency debt obligations		$	175,953,000			$	99,000			$	(6,352,000	)		$	169,700,000
Mortgage-backed securities			38,967,000				335,000				(510,000	)			38,792,000
Municipal general obligation bonds			121,040,000				891,000				(638,000	)			121,293,000
Municipal revenue bonds			3,978,000				30,000				(30,000	)			3,978,000
Other investments			2,010,000				0				(29,000	)			1,981,000

		$	341,948,000			$	1,355,000			$	(7,559,000	)		$	335,744,000

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

		Less than 12 Months								12 Months or More								Total
		Fair				Unrealized				Fair				Unrealized				Fair				Unrealized
		Value				Loss				Value				Loss				Value				Loss
March 31, 2018
U.S. Government agency debt obligations		$	44,594,000			$	1,464,000			$	126,600,000			$	9,793,000			$	171,194,000			$	11,257,000
Mortgage-backed securities			14,519,000				479,000				18,867,000				552,000				33,386,000				1,031,000
Municipal general obligation bonds			43,826,000				615,000				43,537,000				1,010,000				87,363,000				1,625,000
Municipal revenue bonds			1,499,000				16,000				1,159,000				57,000				2,658,000				73,000
Other investments			1,518,000				53,000				0				0				1,518,000				53,000

		$	105,956,000			$	2,627,000			$	190,163,000			$	11,412,000			$	296,119,000			$	14,039,000

		Less than 12 Months								12 Months or More								Total
		Fair Value				Unrealized Loss				Fair Value				Unrealized Loss				Fair Value				Unrealized Loss
December 31, 2017
U.S. Government agency debt obligations		$	35,677,000			$	434,000			$	115,374,000			$	5,918,000			$	151,051,000			$	6,352,000
Mortgage-backed securities			10,179,000				156,000				21,084,000				354,000				31,263,000				510,000
Municipal general obligation bonds			12,807,000				114,000				54,703,000				524,000				67,510,000				638,000
Municipal revenue bonds			0				0				1,187,000				30,000				1,187,000				30,000
Other investments			1,510,000				29,000				0				0				1,510,000				29,000

		$	60,173,000			$	733,000			$	192,348,000			$	6,826,000			$	252,521,000			$	7,559,000

Investments Classified by Contractual Maturity Date [Table Text Block]

		Weighted
		Average				Amortized				Fair
		Yield (%)				Cost				Value

Due in 2018			1.86			$	28,193,000			$	28,181,000
Due in 2019 through 2023			2.12				65,051,000				64,576,000
Due in 2024 through 2028			2.52				99,189,000				94,685,000
Due in 2029 and beyond			2.95				114,780,000				107,230,000
Mortgage-backed securities			2.33				41,104,000				40,351,000
Other investments			2.84				2,018,000				1,965,000

Total available for sale securities			2.51			$	350,335,000			$	336,988,000