Securities (Tables)

12 Months Ended

Dec. 31, 2012

Securities [Abstract]

Components of the available for sale portfolio

	December 31, 2012
	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair value
	(Dollars in thousands)
Available for Sale
U.S. Treasury and government sponsored entities’ securities	$	161,845	$	2,409	$	(562	)	$	163,692
Equity securities		101		212		—			313
Mortgage-backed GSE securities: residential		404,563		6,142		(148	)		410,557
Total	$	566,509	$	8,763	$	(710	)	$	574,562
	December 31, 2011
	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair value
	(Dollars in thousands)
Available for Sale
U.S. Treasury and government sponsored entities’ securities	$	50,003	$	797	$	—		$	50,800
Equity securities		114		149		—			263
Mortgage-backed GSE securities: residential		403,943		4,592		—			408,535
Total	$	454,060	$	5,538	$	—		$	459,598

Debt securities available for sale by contractual maturity

	December 31, 2012
	Amortized cost		Fair value
	(Dollars in thousands)
Due in one year or less	$	—	$	—
Due after one year through five years		500		500
Due after five years through ten years		72,345		73,724
Due after ten years		89,000		89,468
Mortgage-backed GSE securities: residential		404,563		410,557
Total	$	566,408	$	574,249

Summary of proceeds, gross realized gains, losses and impairment charges of available for sale securities

	2012			2011			2010
	(Dollars in thousands)
Proceeds	$	343,000		$	428,396		$	396,291
Gross gains		6,325			8,662			8,970
Gross losses		—			(29	)		(167	)
Impairment charges		(13	)		(89	)		(58	)

Securities available for sale in an unrealized loss position

	Less than 12 months					12 months or more				Total
	Fair value		Unrealized loss			Fair value		Unrealized loss		Fair value		Unrealized loss
	(Dollars in thousands)
Description of securities:
U.S. Treasury and government sponsored entities	$	42,480	$	(562	)	$	—	$	—	$	42,480	$	(562	)
Mortgage-backed GSE securities: residential		72,020		(148	)		—		—		72,020		(148	)
Total temporarily impaired securities	$	114,500	$	(710	)	$	—	$	—	$	114,500	$	(710	)