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Securities (Tables)

12 Months Ended

Dec. 31, 2012

Securities [Abstract]

Summarizes securities held for investment and securities available for sale

The following table summarizes securities held for investment and securities available for sale:

		December 31,
		2012				2011
		(Dollars in thousands)
Held for investment at cost (fair value: $16,689 and $22,958, respectively)		$	16,416			$	22,477
Available for sale, at fair value			546,126				592,500
Total		$	562,542			$	614,977

Summarizes amortized cost and estimated fair values of securities held for investment

The following table summarizes the amortized cost and estimated fair values of securities held for investment:

		Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Estimated Fair Value
		(Dollars in thousands)
December 31, 2012
U.S. Treasury and other Federal agencies		$	781			$	59			$	—			$	840
States and political subdivisions			15,635				222				(8	)			15,849
Total		$	16,416			$	281			$	(8	)		$	16,689
December 31, 2011
U.S. Treasury and other Federal agencies		$	997			$	75			$	—			$	1,072
States and political subdivisions			21,480				406				—				21,886
Total		$	22,477			$	481			$	—			$	22,958

Summarizes amortized cost and estimated fair values of securities available for sale

The following table summarizes the amortized cost and estimated fair values of securities available for sale:

		Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Estimated Fair Value
		(Dollars in thousands)
December 31, 2012
U.S. Federal agencies (1)		$	452,554			$	3,654			$	(164	)		$	456,044
Mortgage backed securities			19,100				825				(1	)			19,924
States and political subdivisions			53,912				2,875				(20	)			56,767
Other securities (2)			10,843				2,562				(14	)			13,391
Total		$	536,409			$	9,916			$	(199	)		$	546,126
December 31, 2011
U.S. Federal agencies (1)		$	481,486			$	6,673			$	(116	)		$	488,043
Mortgage backed securities			28,984				615				(13	)			29,586
States and political subdivisions			60,239				2,490				(20	)			62,709
Other securities (2)			7,222				4,940				—				12,162
Total		$	577,931			$	14,718			$	(149	)		$	592,500

(1) Primarily consists of FHLMC, FNMA, GNMA and mortgage backed securities through U.S. agencies.

(2) Primarily consists of equity securities.

Maturity of securities

The maturities of securities held for investment and available for sale are summarized in the following table using contractual maturities.

		December 31,
		2012								2011
		Amortized Cost				Estimated Fair Value				Amortized Cost				Estimated Fair Value
		(Dollars in thousands)
Held for Investment
Contractual maturity of debt securities:
Within one year		$	4,180			$	4,227			$	5,845			$	5,908
After one year but within five years			10,360				10,496				13,967				14,256
After five years but within ten years			1,400				1,438				1,883				1,943
After ten years			476				528				782				851
Total		$	16,416			$	16,689			$	22,477			$	22,958
Available for Sale
Contractual maturity of debt securities:
Within one year		$	144,666			$	145,027			$	105,169			$	107,109
After one year but within five years			256,890				259,475				317,979				321,661
After five years but within ten years			36,764				38,306				61,412				63,358
After ten years			90,626				93,293				86,149				88,210
Total debt securities			528,946				536,101				570,709				580,338
Equity securities			7,463				10,025				7,222				12,162
Total		$	536,409			$	546,126			$	577,931			$	592,500

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

The following is a detail of proceeds from sales and calls, and realized securities gains and losses, on available for sale securities:

		Year Ended December 31,
		2012				2011				2010
		(Dollars in thousands)
Proceeds		$	10,425			$	94,658			$	5,783
Gross gains realized			5,575				1,940				528
Gross losses realized			660				342				204

Company's book value of pledged securities

The following table is a summary of the Company’s book value of securities that were pledged as collateral for public funds on deposit, repurchase agreements and for other purposes as required or permitted by law:

		Year Ended December 31,
		2012				2011
		(Dollars in thousands)
Book value of pledged securities		$	499,244			$	527,211

Summary of securities with unrealized losses, segregated by the duration of the unrealized loss

The following table summarizes securities with unrealized losses, segregated by the duration of the unrealized loss, at December 31, 2012 and 2011 respectively:

		Less than 12 Months								More than 12 Months								Total
		Estimated Fair Value				Unrealized Losses				Estimated Fair Value				Unrealized Losses				Estimated Fair Value				Unrealized Losses
		(Dollars in thousands)
December 31, 2012
Held for Investment
U.S. Federal agencies		$	—			$	—			$	6			$	—			$	6			$	—
States and political subdivisions			115				—				1,327				8				1,442				8
Total		$	115			$	—			$	1,333			$	8			$	1,448			$	8
Available for Sale
U.S. Federal agencies		$	20,072			$	7			$	151,701			$	158			$	171,773			$	165
States and political subdivisions			928				3				1,505				17				2,433				20
Other			—				—				3,366				14				3,366				14
Total		$	21,000			$	10			$	156,572			$	189			$	177,572			$	199
December 31, 2011
Held for Investment
U.S. Federal agencies		$	—			$	—			$	—			$	—			$	—			$	—
States and political subdivisions			205				—				—				—				205				—
Total		$	205			$	—			$	—			$	—			$	205			$	—
Available for Sale
U.S. Federal agencies		$	—			$	—			$	148,576			$	116			$	148,576			$	116
States and political subdivisions			40				—				3,571				33				3,611				33
Total		$	40			$	—			$	152,147			$	149			$	152,187			$	149

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