Investment Securities (Tables)

6 Months Ended

Jun. 30, 2012

Investment Securities [Abstract]

Amortized cost and estimated fair value of held-to-maturity securities and available-for-sale securities by contractual maturity

	At June 30, 2012									At December 31, 2011
(Dollars in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Securities Held-to-Maturity
Corporate bonds:
After 1 year to 5 years	$	45,538	$	776	$	(18	)	$	46,296	$	45,804	$	154	$	(319	)	$	45,639
		45,538		776		(18	)		46,296		45,804		154		(319	)		45,639
Total	$	45,538	$	776	$	(18	)	$	46,296	$	45,804	$	154	$	(319	)	$	45,639

	At June 30, 2012									At December 31, 2011
(Dollars in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Securities Available-for-Sale
U.S. treasuries:
Within 1 year	$	—	$	—	$	—		$	—	$	2,525	$	—	$	—		$	2,525
		—		—		—			—		2,525		—		—			2,525
U.S. government corporations and agencies:
Within 1 year		6,540		47		—			6,587		10,009		77		—			10,086
After 1 year to 5 years		126,300		1,173		—			127,473		143,189		1,022		(33	)		144,178
		132,840		1,220		—			134,060		153,198		1,099		(33	)		154,264
State and political subdivisions:
Within 1 year		—		—		—			—		752		5		—			757
After 1 year to 5 years		8,441		251		(15	)		8,677		10,082		308		(16	)		10,374
After 5 years to 10 years		26,850		1,029		(92	)		27,787		11,846		664		(3	)		12,507
Over 10 years		79,808		4,872		—			84,680		87,896		5,472		(1	)		93,367
		115,099		6,152		(107	)		121,144		110,576		6,449		(20	)		117,005
Residential mortgage-backed securities:
After 5 years to 10 years		17,969		801		—			18,770		20,745		743		—			21,488
Over 10 years		78,487		2,532		—			81,019		55,328		2,665		(680	)		57,313
		96,456		3,333		—			99,789		76,073		3,408		(680	)		78,801
Commercial mortgage obligations:
After 5 years to 10 years		1,983		34		—			2,017		5,547		124		—			5,671
Over 10 years		24,260		505		—			24,765		54,994		799		—			55,793
		26,243		539		—			26,782		60,541		923		—			61,464
Corporate bonds:
After 1 year to 5 years		4,992		—		(35	)		4,957		4,991		—		(224	)		4,767
		4,992		—		(35	)		4,957		4,991		—		(224	)		4,767
Money market mutual funds:
Within 1 year		4,147		—		—			4,147		3,851		—		—			3,851
		4,147		—		—			4,147		3,851		—		—			3,851
Equity securities:
No stated maturity		2,292		697		(314	)		2,675		2,364		544		(224	)		2,684
		2,292		697		(314	)		2,675		2,364		544		(224	)		2,684
Total	$	382,069	$	11,941	$	(456	)	$	393,554	$	414,119	$	12,423	$	(1,181	)	$	425,361

Amount of securities that were in an unrealized loss position

	At June 30, 2012
	Less than Twelve Months					Twelve Months or Longer					Total
(Dollars in thousands)	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
State and political subdivisions	$	8,183	$	(90	)	$	958	$	(17	)	$	9,141	$	(107	)
Corporate bonds		9,990		(53	)		—		—			9,990		(53	)
Equity securities		23		(3	)		769		(311	)		792		(314	)
Total	$	18,196	$	(146	)	$	1,727	$	(328	)	$	19,923	$	(474	)

	At December 31, 2011
	Less than Twelve Months					Twelve Months or Longer					Total
(Dollars in thousands)	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
U.S. government corporations and agencies	$	24,967	$	(33	)	$	—	$	—		$	24,967	$	(33	)
State and political subdivisions		—		—			1,997		(20	)		1,997		(20	)
Residential mortgage-backed securities		5,184		(20	)		3,311		(660	)		8,495		(680	)
Corporate bonds		34,851		(543	)		—		—			34,851		(543	)
Equity securities		920		(224	)		—		—			920		(224	)
Total	$	65,922	$	(820	)	$	5,308	$	(680	)	$	71,230	$	(1,500	)

Information related to sales of securities

	Six Months Ended June 30,
(Dollars in thousands)	2012		2011
Securities available for sale:
Proceeds from sales	$	57,162	$	5,928
Gross realized gains on sales		1,178		569
Gross realized losses on sales		896		—
Tax expense related to net realized gains on sales		99		199