Note 2 - Securities

9 Months Ended

Sep. 30, 2015

Investments, Debt and Equity Securities [Abstract]

Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]

2.     SECURITIES

The amortized cost and fair value of available for sale securities and the related pre-tax gross unrealized gains and losses recognized in accumulated other comprehensive income are as follows:

			Gross		Gross
	Amortized		Unrealized		Unrealized			Fair
	Cost		Gains		Losses			Value
September 30, 2015
U.S. Government agency debt obligations	$	159,411,000	$	1,939,000	$	(1,957,000	)	$	159,393,000
Mortgage-backed securities		72,211,000		904,000		(151,000	)		72,964,000
Municipal general obligation bonds		122,724,000		1,118,000		(234,000	)		123,608,000
Municipal revenue bonds		9,163,000		88,000		(1,000	)		9,250,000
Other investments		1,947,000		11,000		0			1,958,000
	$	365,456,000	$	4,060,000	$	(2,343,000	)	$	367,173,000
December 31, 2014
U.S. Government agency debt obligations	$	194,894,000	$	1,612,000	$	(3,038,000	)	$	193,468,000
Mortgage-backed securities		92,656,000		1,123,000		(218,000	)		93,561,000
Municipal general obligation bonds		132,347,000		1,042,000		(307,000	)		133,082,000
Municipal revenue bonds		10,769,000		117,000		(13,000	)		10,873,000
Other investments		1,925,000		3,000		0			1,928,000
	$	432,591,000	$	3,897,000	$	(3,576,000	)	$	432,912,000

Securities with unrealized losses at September 30, 2015 and December 31, 2014, aggregated by investment category and length of time that individual securities have been in a continuous loss position, are as follows:

	Less than 12 Months				12 Months or More				Total
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
	Value		Loss		Value		Loss		Value		Loss
September 30, 2015
U.S. Government agency debt obligations	$	0	$	0	$	70,896,000	$	1,957,000	$	70,896,000	$	1,957,000
Mortgage-backed securities		6,831,000		37,000		19,943,000		114,000		26,774,000		151,000
Municipal general obligation bonds		10,994,000		90,000		5,064,000		144,000		16,058,000		234,000
Municipal revenue bonds		0		0		807,000		1,000		807,000		1,000
Other investments		0		0		0		0		0		0
	$	17,825,000	$	127,000	$	96,710,000	$	2,216,000	$	114,535,000	$	2,343,000

	Less than 12 Months				12 Months or More				Total
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
	Value		Loss		Value		Loss		Value		Loss
December 31, 2014
U.S. Government agency debt obligations	$	81,891,000	$	202,000	$	74,120,000	$	2,836,000	$	156,011,000	$	3,038,000
Mortgage-backed securities		49,940,000		218,000		0		0		49,940,000		218,000
Municipal general obligation bonds		54,104,000		307,000		0		0		54,104,000		307,000
Municipal revenue bonds		4,644,000		13,000		0		0		4,644,000		13,000
Other investments		0		0		0		0		0		0
	$	190,579,000	$	740,000	$	74,120,000	$	2,836,000	$	264,699,000	$	3,576,000

We evaluate securities for other-than-temporary impairment at least on a quarterly basis. Consideration is given to the length of time and the extent to which the fair value has been less than cost, the financial condition and near-term prospects of the issuer, and the intent and ability we have to retain our investment in the issuer for a period of time sufficient to allow for any anticipated recovery in fair value.

For those debt securities whose fair value is less than their amortized cost basis, we also consider our intent to sell the security, whether it is more likely than not that we will be required to sell the security before recovery and if we do not expect to recover the entire amortized cost basis of the security. In analyzing an issuer’s financial condition, we may consider whether the securities are issued by the federal government or its agencies, whether downgrades by bond rating agencies have occurred and the results of reviews of the issuer’s financial condition.

At September 30, 2015, 161 debt securities with fair values totaling $114.5 million have unrealized losses aggregating $2.3 million. After we considered whether the securities were issued by the federal government or its agencies and whether downgrades by bond rating agencies had occurred, we determined that unrealized losses were due to changing interest rate environments. As we do not intend to sell our debt securities before recovery of their cost basis and we believe it is more likely than not that we will not be required to sell our debt securities before recovery of the cost basis, no unrealized losses are deemed to be other-than-temporary.

The amortized cost and fair value of debt securities at September 30, 2015, by maturity, are shown in the following table. The contractual maturity is utilized for U.S. Government agency debt obligations and municipal bonds. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Securities not due at a single maturity date, primarily mortgage-backed securities, are shown separately. Weighted average yields are also reflected, with yields for municipal securities shown at their tax equivalent yield.

	Weighted
	Average			Amortized		Fair
	Yield			Cost		Value
Due in 2015		2.12	%	$	8,409,000	$	8,471,000
Due in 2016 through 2020		1.42			150,774,000		151,190,000
Due in 2021 through 2025		3.09			57,813,000		58,359,000
Due in 2026 and beyond		3.56			74,302,000		74,231,000
Mortgage-backed securities		1.69			72,211,000		72,964,000
Other investments		2.53			1,947,000		1,958,000
		2.21	%	$	365,456,000	$	367,173,000

Securities issued by the State of Michigan and all its political subdivisions had a combined amortized cost of $106.0 million and $113.1 million at September 30, 2015 and December 31, 2014, respectively, with estimated market values of $106.9 million and $113.9 million, respectively. Securities issued by all other states and their political subdivisions had a combined amortized cost of $25.9 million and $30.0 million at September 30, 2015 and December 31, 2014, respectively, with estimated market values of $26.0 million and $30.0 million, respectively. Total securities of any other specific issuer, other than the U.S. Government and its agencies and the State of Michigan and all its political subdivisions, did not exceed 10% of shareholders’ equity.

The carrying value of U.S. Government agency debt obligations and mortgage-backed securities that are pledged to secure repurchase agreements was $158.1 million and $167.6 million at September 30, 2015, and December 31, 2014, respectively. Investments in Federal Home Loan Bank stock are restricted and may only be resold or redeemed by the issuer.