4.	Investment Securities

(a) Securities available for sale

The amortized cost and fair value of the securities available for sale are as follows:

(dollars in thousands)	March 31, 2012
Available for sale			Gross		Gross
	Amortized		Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value

U.S. government sponsored enterprises	$	744,750		1,215		1,240		744,725
State and political subdivisions		37,331		1,036		-		38,367
Mortgage backed securities and collateralized mortgage obligations - residential		217,606		1,910		215		219,301
Corporate bonds		81,850		709		905		81,654
Other		650		-		-		650
Total debt securities		1,082,187		4,870		2,360		1,084,697
Equity securities		9,014		-		-		9,014
Total securities available for sale	$	1,091,201		4,870		2,360		1,093,711

(dollars in thousands)	December 31, 2011
Available for sale			Gross		Gross
	Amortized		Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value

U.S. government sponsored enterprises	$	562,588		1,171		300		563,459
State and political subdivisions		42,812		1,156		-		43,968
Mortgage backed securities and collateralized mortgage obligations - residential		202,103		2,335		415		204,023
Corporate bonds		102,248		70		5,710		96,608
Other		650		-		-		650
Total debt securities		910,401		4,732		6,425		908,708
Equity securities		9,014		0		-		9,014
Total securities available for sale	$	919,415		4,732		6,425		917,722

Federal Home Loan Bank stock and Federal Reserve Bank stock included in equity securities at March 31, 2012 and December 31, 2011, totaled $9.0 million.

The following table distributes the debt securities included in the available for sale portfolio as of March 31, 2012, based on the securities' final maturity (mortgage-backed securities and collateralized mortgage obligations are stated using an estimated average life):

	March 31, 2012
(dollars in thousands)	Amortized		Fair
Available for sale	Cost		Value
Due in one year or less	$	15,446		15,718
Due in one year through five years		774,615		776,623
Due after five years through ten years		273,005		272,539
Due after ten years		19,121		19,817
	$	1,082,187		1,084,697

Actual maturities may differ from the above because of securities prepayments and the right of certain issuers to call or prepay their obligations without penalty.

Gross unrealized losses on investment securities available for sale and the related fair values aggregated by the length of time that individual securities have been in an unrealized loss position, were as follows:

(dollars in thousands)
Available for sale	March 31, 2012
	Less than				12 months
	12 months				or more				Total
			Gross				Gross				Gross
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
	Value		Loss		Value		Loss		Value		Loss

U.S. government sponsored enterprises	$	384,355		1,240		-		-		384,355		1,240
Mortgage backed securities and collateralized mortgage obligations - residential		60,155		169		777		46		60,932		215
Corporate bonds		20,837		687		20,437		218		41,274		905
Total available for sale	$	465,347		2,096		21,214		264		486,561		2,360

(dollars in thousands)	December 31, 2011
Available for sale	Less than				12 months
	12 months				or more				Total
			Gross				Gross				Gross
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
	Value		Loss		Value		Loss		Value		Loss
U.S. government sponsored enterprises	$	147,881		300		-		-		147,881		300
Mortgage backed securities and collateralized mortgage obligations - residential		107,369		369		781		46		108,150		415
Corporate bonds		72,077		4,487		19,467		1,223		91,544		5,710
Total available for sale	$	327,327		5,156		20,248		1,269		347,575		6,425

Proceeds from sales and calls of securities available for sale, gross realized gains and gross realized losses for the three months ended March 31, 2012 and 2011 were as follows:

	Three Months Ended March 31,
	2012		2011
Proceeds from sales		37,857		5,549
Proceeds from calls		234,725		16,447
Gross realized gains		775		287
Gross realized losses		98		-

Income tax expense recognized on net gains on sales and calls of securities available for sale were approximately $237 thousand and $100 thousand for the three months ended March 31, 2012 and 2011, respectively.

(b) Held to maturity securities

The amortized cost and fair value of the held to maturity securities are as follows:

(dollars in thousands)	March 31, 2012
Held to maturity			Gross		Gross
	Amortized		Unrecognized		Unrecognized		Fair
	Cost		Gains		Losses		Value
Mortgage backed securities and collateralized mortgage obligations - residential		143,629		7,364		-		150,993
Corporate bonds		35,312		1,623		-		36,935
Total held to maturity securities	$	178,941		8,987		-		187,928

(dollars in thousands)	December 31, 2011
Held to maturity			Gross		Gross
	Amortized		Unrecognized		Unrecognized		Fair
	Cost		Gains		Losses		Value
U.S. government sponsored enterprises	$	15,000		19		-		15,019
Mortgage backed securities and collateralized mortgage obligations - residential		141,857		7,727		46		149,538
Corporate bonds		59,431		834		382		59,883
Total held to maturity securities	$	216,288		8,580		428		224,440

The following table distributes the debt securities included in the held to maturity portfolio as of March 31, 2012, based on the securities' final maturity (mortgage-backed securities and collateralized mortgage obligations are stated using estimated average life):

	March 31, 2012
(dollars in thousands)	Amortized		Fair
Held to maturity	Cost		Value
Due in one year or less	$	15,371		15,559
Due in one year through five years		134,956		142,517
Due in five years through ten years		28,614		29,852
	$	178,941		187,928

Actual maturities may differ from the above because of securities prepayments and the right of certain issuers to call or prepay their obligations without penalty.

As of March 31 2012, there were no held to maturity securities in an unrecognized loss position.

Gross unrecognized losses on held to maturity securities and the related fair values aggregated by the length of time that individual securities have been in an unrecognized loss position as of December 31, 2011, were as follows:

(dollars in thousands)	December 31, 2011
	Less than				12 months
	12 months				or more				Total
			Gross				Gross				Gross
	Fair		Unrec.		Fair		Unrec.		Fair		Unrec.
	Value		Loss		Value		Loss		Value		Loss

Mortgage backed securities and collateralized mortgage obligations - residential	$	19,328		46		-		-		19,328		46
Corporate bonds		9,532		382		-		-		9,532		382
Total	$	28,860		428		-		-		28,860		428

There were no sales or transfers of held to maturity securities during 2012 and 2011.

Management evaluates securities for other-than-temporary impairment ("OTTI") at least on a quarterly basis, and more frequently when economic or market conditions warrant such an evaluation. The investment securities portfolio is evaluated for OTTI by segregating the portfolio by type and applying the appropriate OTTI model. Investment securities classified as available for sale or held-to-maturity are generally evaluated for OTTI under FASB ASC 320 "Investments - Debt and Equity Securities."

In determining OTTI under the FASB ASC 320 model, management considers many factors, including: (1) the length of time and the extent to which the fair value has been less than cost, (2) the financial condition and near-term prospects of the issuer, (3) whether the market decline was affected by macroeconomic conditions, and (4) whether the Company has the intent to sell the debt security or more likely than not will be required to sell the debt security before its anticipated recovery. The assessment of whether an other-than-temporary decline exists involves a high degree of subjectivity and judgment and is based on the information available to management at a point in time.

When OTTI occurs, the amount of the OTTI recognized in earnings depends on whether management intends to sell the security or whether it is more likely than not it will be required to sell the security before recovery of its amortized cost basis. If management intends to sell or it is more likely than not it will be required to sell the security before recovery of its amortized cost basis, the OTTI shall be recognized in earnings equal to the entire difference between the investment's amortized cost basis and its fair value at the balance sheet date. If management does not intend to sell the security and it is not more likely than not that the entity will be required to sell the security before recovery of its amortized cost basis, the OTTI on debt securities shall be separated into the amount representing the credit loss and the amount related to all other factors. The amount of the total OTTI related to the credit loss is determined based on the present value of cash flows expected to be collected and is recognized in earnings. The amount of the total OTTI related to other factors is recognized in other comprehensive income, net of applicable taxes. The previous amortized cost basis less the OTTI recognized in earnings becomes the new amortized cost basis of the investment.

As of March 31, 2012, the Company's security portfolio consisted of 274 securities, 51 of which were in an unrealized loss position, and are discussed below.

Mortgage-backed Securities and Collateralized Mortgage Obligations - Residential

At March 31, 2012, all of the mortgage-backed securities held by the Company were issued by U.S. government-sponsored entities and agencies, primarily GNMA (Ginnie Mae), FNMA (Fannie Mae) and FHLMC (Freddie Mac), institutions which the government has affirmed its commitment to support. Because the decline in fair value is attributable to changes in interest rates, and not credit quality, and because the Company does not have the intent to sell these securities and it is likely that it will not be required to sell the securities before their anticipated recovery, the Company does not consider these securities to be other-than-temporarily impaired at March 31, 2012.

Corporate bonds

In the case of corporate bonds, the Company's exposure is primarily in bonds of firms in the financial sector. Changing market perceptions of that sector and of some specific firms has had a negative impact on bond pricing. All of the corporate bonds owned continue to be rated investment grade, all are current as to the payment of interest and the Company expects to collect the full amount of the principal balance at maturity. The Company actively monitors the firms and the bonds. The Company has concluded that the decline in fair value is not attributable to credit quality and because the Company does not have the intent to sell these securities and it is likely that it will not be required to sell the securities before their anticipated recovery, the Company does not consider these securities to be other-than-temporarily impaired at March 31, 2012.

U.S. Government-sponsored enterprises

At March 31, 2012, the Company has unrealized losses on U.S. government-sponsored enterprises. Because the decline in fair value is attributable to changes in interest rates, and not credit quality, and because the Company does not have the intent to sell these securities and it is likely that it will not be required to sell the securities before their anticipated recovery, the Company does not consider these securities to be other-than-temporarily impaired at March 31, 2012.

As a result of the above analysis, for the quarter ended March 31, 2012, the Company did not recognize any other-than-temporary impairment losses for credit or any other reason.