Investment Securities (Tables)

6 Months Ended

Jun. 30, 2013

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, 2013
			Gross		Gross
	Amortized		Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value
U.S. government sponsored enterprises	$	191,032		78		2,977		188,133
State and political subdivisions		11,851		308		-		12,159
Mortgage backed securities and collateralized mortgage obligations - residential		520,391		340		15,938		504,793
Corporate bonds		53,352		137		436		53,053
Small Business Administration-guaranteed participation securities		114,247		-		5,582		108,665
Mortgage backed securities and collateralized mortgage obligations - commercial		11,097		-		372		10,725
Other		650		-		-		650
Total debt securities		902,620		863		25,305		878,178
Equity securities		10		-		-		10
Total securities available for sale	$	902,630		863		25,305		878,188

	December 31, 2012
				Gross		Gross
	Amortized			Unrealized		Unrealized		Fair
	Cost			Gains		Losses		Value
U.S. government sponsored enterprises		$	262,063		1,055		10		263,108
State and political subdivisions			25,815		642		-		26,457
Mortgage backed securities and collateralized mortgage obligations - residential			515,322		3,982		528		518,776
Corporate bonds			26,312		336		119		26,529
Small Business Administration-guaranteed participation securities			75,674		888		-		76,562
Other			650		-		-		650
Total debt securities			905,836		6,903		657		912,082
Equity securities			10		-		-		10
Total securities available for sale		$	905,846		6,903		657		912,092

Investment [Line Items]

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

The proceeds from sales and calls of securities available for sale, gross realized gains and gross realized losses from sales and calls during the three months and six months ended June 30, 2013 and 2012 are as follows:

(dollars in thousands)	Three months ended June 30,				Six months ended June 30,
	2013		2012		2013		2012
Proceeds from sales	$	118,560		16,141	$	118,560		53,998
Proceeds from calls		96,417		313,024		205,414		547,749
Gross realized gains		1,512		157		1,514		932
Gross realized losses		80		102		80		200

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, 2013
			Gross		Gross
	Amortized		Unrecognized		Unrecognized		Fair
	Cost		Gains		Losses		Value
Mortgage backed securities and collateralized mortgage obligations - residential	$	88,852		3,426		124		92,154
Corporate bonds		9,937		1,240		-		11,177
Total held to maturity	$	98,789		4,666		124		103,331

	December 31, 2012
			Gross		Gross
	Amortized		Unrecognized		Unrecognized		Fair
	Cost		Gains		Losses		Value
Mortgage backed securities and collateralized mortgage obligations - residential	$	108,471		5,724		-		114,195
Corporate bonds		34,955		1,976		-		36,931
Total held to maturity	$	143,426		7,700		-		151,126

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, 2013, based on the securities’ final maturity (mortgage-backed securities and collateralized mortgage obligations are stated using an estimated average life):

(dollars in thousands)	Amortized		Fair
	Cost		Value
Due in one year or less	$	10,598		10,730
Due in one year through five years		739,312		720,947
Due after five years through ten years		147,646		141,325
Due after ten years		5,064		5,176
	$	902,620		878,178

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

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 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)	June 30, 2013
	Less than				12 months
	12 months				or more				Total
			Gross				Gross				Gross
	Fair		Unreal.		Fair		Unreal.		Fair		Unreal.
	Value		Loss		Value		Loss		Value		Loss
U.S. government sponsored enterprises	$	166,770		2,977		-		-		166,770		2,977
Mortgage backed securities and collateralized mortgage obligations - residential		475,756		15,938		-		-		475,756		15,938
Corporate bonds		32,427		435		401		1		32,828		436
Small Business Administration-guaranteed participation securities		108,665		5,582		-		-		108,665		5,582
Mortgage backed securities and collateralized mortgage obligations - commercial		10,725		372		-		-		10,725		372
Total	$	794,343		25,304		401		1		794,744		25,305

	December 31, 2012
	Less than				12 months
	12 months				or more				Total
			Gross				Gross				Gross
	Fair		Unreal.		Fair		Unreal.		Fair		Unreal.
	Value		Loss		Value		Loss		Value		Loss
U.S. government sponsored enterprises	$	15,491		10		-		-		15,491		10
Mortgage backed securities and collateralized mortgage obligations - residential		178,689		528		-		-		178,689		528
Corporate bonds		10,283		119		-		-		10,283		119
Total	$	204,463		657		-		-		204,463		657

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, 2013, based on the securities’ final maturity (mortgage-backed securities and collateralized mortgage obligations are stated using an estimated average life):

(dollars in thousands)	Amortized		Fair
	Cost		Value
Due in one year or less	$	-		-
Due in one year through five years		98,789		103,331
Due in five years through ten years		-		-
	$	98,789		103,331

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 securities held to maturity 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)

June 30, 2013

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

$

28,053

124

-

-

28,053

124

Total

$

28,053

124

-

-

28,053

124