Investment Securities (Tables)

9 Months Ended

Sep. 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)	September 30, 2013
			Gross		Gross
	Amortized		Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value
U.S. government sponsored enterprises	$	196,033		62		2,481		193,614
State and political subdivisions		10,978		221		-		11,199
Mortgage backed securities and collateralized mortgage obligations - residential		546,879		1,056		13,634		534,301
Corporate bonds		53,127		111		144		53,094
Small Business Administration-guaranteed participation securities		112,719		-		7,856		104,863
Mortgage backed securities and collateralized mortgage obligations - commercial		11,031		-		316		10,715
Other		650		-		-		650
Total debt securities		931,417		1,450		24,431		908,436
Equity securities		10		-		-		10
Total securities available for sale	$	931,427		1,450		24,431		908,446

	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 nine months ended September 30, 2013 and 2012 are as follows:

(dollars in thousands)	Three months ended September 30,					Nine months ended September 30,
	2013			2012		2013			2012
Proceeds from sales		$	-		26,299		$	118,560		80,297
Proceeds from calls			31,704		278,165			237,118		825,914
Gross realized gains			-		666			1,514		1,598
Gross realized losses			-		-			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)	September 30, 2013
			Gross		Gross
	Amortized		Unrecognized		Unrecognized		Fair
	Cost		Gains		Losses		Value
Mortgage backed securities and collateralized mortgage obligations - residential	$	81,337		3,336		51		84,622
Corporate bonds		9,941		1,405		-		11,346
Total held to maturity	$	91,278		4,741		51		95,968

	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 September 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	$	11,066		11,160
Due in one year through five years		613,821		605,382
Due after five years through ten years		302,411		287,710
Due after ten years		4,119		4,184
	$	931,417		908,436

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 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)	September 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	$	177,267		2,481		-		-		177,267		2,481
Mortgage backed securities and collateralized mortgage obligations - residential		463,190		13,634		-		-		463,190		13,634
Corporate bonds		31,705		142		400		2		32,105		144
Small Business Administration-guaranteed participation securities		104,863		7,856		-		-		104,863		7,856
Mortgage backed securities and collateralized mortgage obligations - commercial		10,715		316		-		-		10,715		316
Total	$	787,740		24,429		400		2		788,140		24,431

	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 September 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		91,278		95,968
Due in five years through ten years		-		-
	$	91,278		95,968

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)

September 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

$

5,146

51

-

-

5,146

51

Total

$

5,146

51

-

-

5,146

51