Note 2 - Securities (Tables)

6 Months Ended

Jun. 30, 2017

Notes Tables

Available-for-sale Securities [Table Text Block]

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
June 30, 2017
U.S. Government agency debt obligations	$	157,873,000	$	395,000	$	(3,618,000	)	$	154,650,000
Mortgage-backed securities		39,873,000		490,000		(164,000	)		40,199,000
Municipal general obligation bonds		118,893,000		1,799,000		(208,000	)		120,484,000
Municipal revenue bonds		4,915,000		58,000		(21,000	)		4,952,000
Other investments		1,994,000		0		(21,000	)		1,973,000
	$	323,548,000	$	2,742,000	$	(4,032,000	)	$	322,258,000
December 31, 2016
U.S. Government agency debt obligations	$	159,271,000	$	106,000	$	(7,337,000	)	$	152,040,000
Mortgage-backed securities		47,329,000		486,000		(423,000	)		47,392,000
Municipal general obligation bonds		120,284,000		312,000		(1,549,000	)		119,047,000
Municipal revenue bonds		7,699,000		23,000		(91,000	)		7,631,000
Other investments		1,979,000		0		(29,000	)		1,950,000
	$	336,562,000	$	927,000	$	(9,429,000	)	$	328,060,000

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, 2017
U.S. Government agency debt obligations	$	108,900,000	$	3,590,000	$	1,972,000	$	28,000	$	110,872,000	$	3,618,000
Mortgage-backed securities		18,835,000		105,000		5,829,000		59,000		24,664,000		164,000
Municipal general obligation bonds		16,242,000		196,000		2,243,000		12,000		18,485,000		208,000
Municipal revenue bonds		1,353,000		8,000		544,000		13,000		1,897,000		21,000
Other investments		1,494,000		21,000		0		0		1,494,000		21,000
	$	146,824,000	$	3,920,000	$	10,588,000	$	112,000	$	157,412,000	$	4,032,000

	Less than 12 Months				12 Months or More				Total
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
December 31, 2016
U.S. Government agency debt obligations	$	110,160,000	$	7,172,000	$	5,073,000	$	165,000	$	115,233,000	$	7,337,000
Mortgage-backed securities		3,670,000		4,000		37,072,000		419,000		40,742,000		423,000
Municipal general obligation bonds		65,895,000		1,360,000		27,734,000		189,000		93,629,000		1,549,000
Municipal revenue bonds		1,921,000		90,000		206,000		1,000		2,127,000		91,000
Other investments		1,479,000		29,000		0		0		1,479,000		29,000
	$	183,125,000	$	8,655,000	$	70,085,000	$	774,000	$	253,210,000	$	9,429,000

Investments Classified by Contractual Maturity Date [Table Text Block]

	Weighted Average Yield			Amortized Cost		Fair Value
Due in 2017		1.26	%	$	10,132,000	$	10,140,000
Due in 2018 through 2022		2.21			95,647,000		96,263,000
Due in 2023 through 2027		2.69			97,643,000		97,182,000
Due in 2028 and beyond		2.88			78,259,000		76,501,000
Mortgage-backed securities		1.87			39,873,000		40,199,000
Other investments		1.32			1,994,000		1,973,000
Total available for sale securities		2.44	%	$	323,548,000	$	322,258,000