Note 3 - Investment Securities

12 Months Ended

Dec. 31, 2012

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

Note 3: Investment Securities

The amortized cost, unrealized gains and losses, and estimated market value of the available for sale investment securities portfolio follows:

	Investment Securities Available for Sale At December 31, 2012
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(In thousands)
U.S. Treasury securities	$	3,520	$	38	$	—		$	3,558
Securities of U.S. Government sponsored entities		49,335		207		(17	)		49,525
Residential mortgage-backed securities		53,078		3,855		(1	)		56,932
Commercial mortgage-backed securities		4,076		69		—			4,145
Obligations of States and political subdivisions		200,769		14,730		(252	)		215,247
Residential collateralized mortgage obligations		219,613		1,786		(294	)		221,105
Asset-backed securities		16,130		18		(143	)		16,005
FHLMC and FNMA stock		824		2,061		(5	)		2,880
Corporate securities		250,655		3,009		(826	)		252,838
Other securities		2,091		1,370		(60	)		3,401
Total	$	800,091	$	27,143	$	(1,598	)	$	825,636

The amortized cost, unrealized gains and losses, and estimated market value of the held to maturity investment securities portfolio follows:

	Investment Securities Held to Maturity At December 31, 2012
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Market Value
	(In thousands)
Securities of U.S. Government sponsored entities	$	3,232	$	43	$	—		$	3,275
Residential mortgage-backed securities		72,807		2,090		(10	)		74,887
Obligations of States and political subdivisions		680,802		23,004		(1,235	)		702,571
Residential collateralized mortgage obligations		399,200		5,185		(561	)		403,824
Total	$	1,156,041	$	30,322	$	(1,806	)	$	1,184,557

The amortized cost, unrealized gains and losses, and estimated market value of the available for sale investment securities portfolio follows:

	Investment Securities Available for Sale At December 31, 2011
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(In thousands)
U.S. Treasury securities	$	3,537	$	59	$	—		$	3,596
Securities of U.S. Government sponsored entities		117,150		375		(53	)		117,472
Residential mortgage-backed securities		84,961		5,457		(10	)		90,408
Commercial mortgage-backed securities		4,506		27		(3	)		4,530
Obligations of States and political subdivisions		234,522		11,839		(268	)		246,093
Residential collateralized mortgage obligations		49,111		2,053		—			51,164
Asset-backed securities		7,566		—		(260	)		7,306
FHLMC and FNMA stock		824		1,027		(4	)		1,847
Corporate securities		114,286		203		(2,290	)		112,199
Other securities		2,302		1,884		(48	)		4,138
Total	$	618,765	$	22,924	$	(2,936	)	$	638,753

The amortized cost, unrealized gains and losses, and estimated market value of the held to maturity investment securities portfolio follows:

	Investment Securities Held to Maturity At December 31, 2011
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Market Value
	(In thousands)
Residential mortgage-backed securities	$	54,869	$	1,532	$	(77	)	$	56,324
Obligations of States and political subdivisions		625,390		23,581		(496	)		648,475
Residential collateralized mortgage obligations		242,544		2,781		(2,631	)		242,694
Total	$	922,803	$	27,894	$	(3,204	)	$	947,493

The amortized cost and estimated market value of securities by contractual maturity are shown in the following table:

	At December 31, 2012
	Securities Available for Sale				Securities Held to Maturity
	Amortized Cost		Estimated Market Value		Amortized Cost		Estimated Market Value
	(In thousands)
Maturity in years:
1 year or less	$	40,380	$	40,686	$	10,265	$	10,496
Over 1 to 5 years		309,293		312,480		167,162		171,769
Over 5 to 10 years		59,817		63,540		227,603		236,608
Over 10 years		110,919		120,467		279,004		286,973
Subtotal		520,409		537,173		684,034		705,846
Mortgage-backed securities and residential collateralized mortgage obligations		276,767		282,182		472,007		478,711
Other securities		2,915		6,281		—		—
Total	$	800,091	$	825,636	$	1,156,041	$	1,184,557

The amortized cost and estimated market value of securities by contractual maturity are shown in the following table:

	At December 31, 2011
	Securities Available for Sale				Securities Held to Maturity
	Amortized Cost		Estimated Market Value		Amortized Cost		Estimated Market Value
	(In thousands)
Maturity in years:
1 year or less	$	37,785	$	37,967	$	12,056	$	12,121
Over 1 to 5 years		242,766		241,945		158,438		162,791
Over 5 to 10 years		63,442		65,919		307,504		321,922
Over 10 years		133,068		140,835		147,392		151,641
Subtotal		477,061		486,666		625,390		648,475
Mortgage-backed securities and residential collateralized mortgage obligations		138,578		146,102		297,413		299,018
Other securities		3,126		5,985		—		—
Total	$	618,765	$	638,753	$	922,803	$	947,493

Expected maturities of mortgage-backed securities can differ from contractual maturities because borrowers have the right to call or prepay obligations with or without call or prepayment penalties. In addition, such factors as prepayments and interest rates may affect the yield on the carrying value of mortgage-backed securities. At December 31, 2012 and 2011, the Company had no high-risk collateralized mortgage obligations as defined by regulatory guidelines.

An analysis of gross unrealized losses of the available for sale investment securities portfolio follows:

	Investment Securities Available for Sale At December 31, 2012
	Less than 12 months					12 months or longer					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
	(In thousands)
Securities of U.S. Government sponsored entities	$	9,983	$	(17	)	$	—	$	—		$	9,983	$	(17	)
Residential mortgage-backed securities		103		(1	)		11		—			114		(1	)
Residential collateralized mortgage obligations		72,803		(294	)		—		—			72,803		(294	)
Obligations of States and political subdivisions		2,080		(23	)		8,928		(229	)		11,008		(252	)
Asset-backed securities		—		—			5,828		(143	)		5,828		(143	)
FHLMC and FNMA stock		—		—			1		(5	)		1		(5	)
Corporate securities		53,570		(423	)		24,597		(403	)		78,167		(826	)
Other securities		—		—			1,940		(60	)		1,940		(60	)
Total	$	138,539	$	(758	)	$	41,305	$	(840	)	$	179,844	$	(1,598	)

An analysis of gross unrealized losses of the held to maturity investment securities portfolio follows:

	Investment Securities Held to Maturity At December 31, 2012
	Less than 12 months					12 months or longer					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
	(In thousands)
Residential  mortgage-backed securities	$	113	$	—		$	664	$	(10	)	$	777	$	(10	)
Residential collateralized mortgage obligations		26,683		(386	)		9,353		(175	)		36,036		(561	)
Obligations of States and political subdivisions		69,839		(1,205	)		4,275		(30	)		74,114		(1,235	)
Total	$	96,635	$	(1,591	)	$	14,292	$	(215	)	$	110,927	$	(1,806	)

The unrealized losses on the Company’s investment securities were caused by market conditions for these types of investments.  The Company evaluates securities on a quarterly basis including changes in security ratings issued by ratings agencies, changes in the financial condition of the issuer, and, for mortgage-related and asset-backed securities, delinquency and loss information with respect to the underlying collateral, changes in the levels of subordination for the Company’s particular position within the repayment structure, and remaining credit enhancement as compared to expected credit losses of the security.  During the second quarter 2012, the Company transferred one residential collateralized mortgage obligation with a carrying value of $9,077 thousand from the held to maturity portfolio to the available for sale portfolio. The residential collateralized mortgage obligation was subsequently sold due to a decline in the credit worthiness from increased losses on subordinate tranches resulting in proceeds of $7,790 thousand and a realized loss on sale of $1,287 thousand. Substantially all of these securities continue to be investment grade rated by one or more major rating agencies. In addition to monitoring credit rating agency evaluations, Management performs its own evaluations regarding the credit worthiness of the issuer or the securitized assets underlying asset backed securities.

The Company does not intend to sell any investments and has concluded that it is more likely than not that it will not be required to sell the investments prior to recovery of the amortized cost basis. Therefore, the Company does not consider these investments to be other-than-temporarily impaired as of December 31, 2012.

The fair values of the investment securities could decline in the future if the general economy deteriorates, credit ratings decline, the issuer’s financial condition deteriorates, or the liquidity for securities declines. As a result, other than temporary impairments may occur in the future.

As of December 31, 2012, $850,421 thousand of investment securities were pledged to secure public deposits and short-term funding needs, compared to $903,807 thousand at December 31, 2011.

An analysis of gross unrealized losses of the available for sale investment securities portfolio follows:

	Investment Securities Available for Sale At December 31, 2011
	Less than 12 months					12 months or longer					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
	(In thousands)
Securities of U.S. Government sponsored entities	$	35,051	$	(53	)	$	—	$	—		$	35,051	$	(53	)
Residential mortgage-backed securities		3,443		(10	)		—		—			3,443		(10	)
Commercial mortgage-backed securities		—		—			1,347		(3	)		1,347		(3	)
Obligations of States and political subdivisions		5,803		(61	)		15,015		(207	)		20,818		(268	)
Asset-backed securities		—		—			7,306		(260	)		7,306		(260	)
FHLMC and FNMA stock		—		—			1		(4	)		1		(4	)
Corporate securities		32,048		(1,516	)		24,226		(774	)		56,274		(2,290	)
Other securities		—		—			1,953		(48	)		1,953		(48	)
Total	$	76,345	$	(1,640	)	$	49,848	$	(1,296	)	$	126,193	$	(2,936	)

An analysis of gross unrealized losses of the held to maturity investment securities portfolio follows:

	Investment Securities Held to Maturity At December 31, 2011
	Less than 12 months					12 months or longer					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
	(In thousands)
Residential  mortgage-backed securities	$	14,032	$	(77	)	$	—	$	—		$	14,032	$	(77	)
Obligations of States and political subdivisions		38,026		(334	)		6,441		(162	)		44,467		(496	)
Residential collateralized mortgage obligations		50,355		(373	)		15,443		(2,258	)		65,798		(2,631	)
Total	$	102,413	$	(784	)	$	21,884	$	(2,420	)	$	124,297	$	(3,204	)

The following table provides information about the amount of interest income from taxable and non-taxable investment securities:

	For the Year Ended December 31,
	2012		2011
	(In thousands)
Taxable:
Mortgage related securities	$	14,696	$	11,834
Other		6,650		5,570
Total taxable		21,346		17,404
Tax-exempt		31,198		29,902
Total interest income from investment securities	$	52,544	$	47,306