Note 2 - Securities (Tables)

3 Months Ended

Mar. 31, 2017

Notes Tables

Available-for-sale Securities [Table Text Block]

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
March 31, 2017
U.S. Government agency debt obligations	$	162,923,000	$	73,000	$	(6,985,000	)	$	156,011,000
Mortgage-backed securities		43,525,000		472,000		(293,000	)		43,704,000
Municipal general obligation bonds		123,235,000		496,000		(1,201,000	)		122,530,000
Municipal revenue bonds		8,295,000		22,000		(78,000	)		8,239,000
Other investments		1,986,000		0		(29,000	)		1,957,000
	$	339,964,000	$	1,063,000	$	(8,586,000	)	$	332,441,000
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		Unrealized		Fair		Unrealized		Fair		Unrealized
	Value		Loss		Value		Loss		Value		Loss
March 31, 2017
U.S. Government agency debt obligations	$	123,657,000	$	6,850,000	$	4,108,000	$	135,000	$	127,765,000	$	6,985,000
Mortgage-backed securities		19,107,000		145,000		15,498,000		148,000		34,605,000		293,000
Municipal general obligation bonds		46,728,000		1,047,000		8,805,000		154,000		55,533,000		1,201,000
Municipal revenue bonds		1,246,000		78,000		0		0		1,246,000		78,000
Other investments		1,486,000		29,000		0		0		1,486,000		29,000
	$	192,224,000	$	8,149,000	$	28,411,000	$	437,000	$	220,635,000	$	8,586,000

	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		Amortized		Fair
	Yield (%)		Cost		Value
Due in 2017		1.45	$	30,644,000	$	30,670,000
Due in 2018 through 2022		2.24		97,092,000		97,132,000
Due in 2023 through 2027		2.68		93,216,000		90,060,000
Due in 2028 and beyond		2.84		73,501,000		68,918,000
Mortgage-backed securities		1.85		43,525,000		43,704,000
Other investments		0.65		1,986,000		1,957,000
Total available for sale securities		2.36	$	339,964,000	$	332,441,000