Investment Securities (Tables)

6 Months Ended

Jun. 30, 2012

Investment Securities [Abstract]

Amortized cost and fair value of the securities available for sale

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

(dollars in thousands)	June 30, 2012
Available for sale			Gross		Gross
	Amortized		Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value
U.S. government sponsored enterprises	$	641,497		1,692		-		643,189
State and political subdivisions		36,046		932		-		36,978
Mortgage backed securities and collateralized mortgage obligations - residential		351,025		3,410		150		354,285
Corporate bonds		74,170		236		1,095		73,311
Other		650		-		-		650
Total debt securities		1,103,388		6,270		1,245		1,108,413
Equity securities		9,642		-		-		9,642
Total securities available for sale	$	1,113,030		6,270		1,245		1,118,055

(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		-		-		9,014
Total securities available for sale	$	919,415		4,732		6,425		917,722

Investment [Line Items]

Proceeds from sales and calls of securities available for sale, gross realized gains and gross realized losses

Proceeds from sales and calls of securities available for sale, gross realized gains and gross realized losses for the three months and six months ended June 30, 2012 and 2011 were as follows:

(dollars in thousands)	Three Months Ended June 30,				Six Months Ended June 30,
	2012		2011		2012		2011
Proceeds from sales		16,141		40,427		53,998		45,976
Proceeds from calls		313,024		341,214		547,749		357,661
Gross realized gains		157		888		932		1,175
Gross realized losses		102		37		200		37

Amortized cost and fair value of the held to maturity securities

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

(dollars in thousands)	June 30, 2012
Held to maturity			Gross		Gross
	Amortized		Unrecognized		Unrecognized		Fair
	Cost		Gains		Losses		Value
Mortgage backed securities and collateralized mortgage obligations - residential		133,562		7,197		-		140,759
Corporate bonds		35,193		1,406		-		36,599
Total held to maturity securities	$	168,755		8,603		-		177,358

(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

Securities available for sale [Member]

Investment [Line Items]

Debt securities based on the securities final maturity

The following table distributes the debt securities included in the available for sale portfolio as of June 30, 2012, based on the securities' final maturity (mortgage-backed securities and collateralized mortgage obligations are stated using an estimated average life):

	June 30, 2012
(dollars in thousands)	Amortized		Fair
Available for sale	Cost		Value
Due in one year or less	$	11,632		11,733
Due in one year through five years		824,740		828,350
Due after five years through ten years		250,078		250,771
Due after ten years		16,938		17,559
	$	1,103,388		1,108,413

Gross unrealized losses on investment securities and the related fair values aggregated by the length of time that individual securities have been in an unrealized loss position

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	June 30, 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
Mortgage backed securities and collateralized mortgage obligations - residential		38,314		150		-		-		38,314		150
Corporate bonds		10,615		20		41,011		1,075		51,626		1,095
Total available for sale	$	48,929		170		41,011		1,075		89,940		1,245

(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

Held to maturity securities [Member]

Investment [Line Items]

Debt securities based on the securities final maturity

The following table distributes the debt securities included in the held to maturity portfolio as of June 30, 2012, based on the securities' final maturity (mortgage-backed securities and collateralized mortgage obligations are stated using estimated average life):

	June 30, 2012
(dollars in thousands)	Amortized		Fair
Held to maturity	Cost		Value
Due in one year or less	$	25,271		25,822
Due in one year through five years		115,652		122,369
Due in five years through ten years		27,832		29,167
	$	168,755		177,358

Gross unrealized losses on investment securities and the related fair values aggregated by the length of time that individual securities have been in an unrealized 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