Investment Securities (Tables)

6 Months Ended

Jun. 30, 2013

Investments Debt And Equity Securities [Abstract]

Amortized Cost and Estimated Fair Value of Investment Securities Available for Sale

The amortized cost and estimated fair value of investment securities available for sale at June 30, 2013, December 31, 2012 and June 30, 2012 are presented below:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(Dollars in Thousands)
June 30, 2013:
U.S. government agencies	$	14,944	$	—	$	(609	)	$	14,335
State, county and municipal securities		109,793		3,708		(742	)		112,759
Corporate debt securities		10,543		311		(764	)		10,090
Mortgage-backed securities		177,196		3,824		(2,036	)		178,984
Total securities	$	312,476	$	7,843	$	(4,151	)	$	316,168
December 31, 2012:
U.S. government agencies	$	6,605	$	271	$	(6	)	$	6,870
State, county and municipal securities		109,736		4,864		(210	)		114,390
Corporate debt securities		10,545		330		(547	)		10,328
Mortgage-backed securities		209,824		5,701		(204	)		215,321
Total securities	$	336,710	$	11,166	$	(967	)	$	346,909
June 30, 2012:
U.S. government agencies	$	8,602	$	296	$	—		$	8,898
State, county and municipal securities		95,354		5,047		(74	)		100,327
Corporate debt securities		11,792		231		(517	)		11,506
Mortgage-backed securities		239,412		7,032		(195	)		246,249
Total securities	$	355,160	$	12,606	$	(786	)	$	366,980

Amortized Cost and Fair Value of Available-for-Sale Securities by Contractual Maturity

The amortized cost and fair value of available-for-sale securities at June 30, 2013 by contractual maturity are summarized in the table below. Expected maturities for mortgage-backed securities may differ from contractual maturities because in certain cases borrowers can prepay obligations without prepayment penalties. Therefore, these securities are not included in the following maturity summary:

	Amortized Cost		Fair Value
	(Dollars in Thousands)
Due in one year or less	$	3,026	$	3,029
Due from one year to five years		37,087		38,668
Due from five to ten years		64,362		64,876
Due after ten years		30,805		30,611
Mortgage-backed securities		177,196		178,984
	$	312,476	$	316,168

Schedule of Gross Unrealized Losses and Fair Value of Securities

The following table details the gross unrealized losses and fair value of securities aggregated by category and duration of continuous unrealized loss position at June 30, 2013, December 31, 2012 and June 30, 2012.

	Less Than 12 Months					12 Months or More					Total
Description of Securities	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
	(Dollars in Thousands)
June 30, 2013:
U.S. government agencies	$	14,335	$	(609	)	$	—	$	—		$	14,335	$	(609	)
State, county and municipal securities		36,268		(726	)		497		(16	)		36,765		(742	)
Corporate debt securities		—		—			4,333		(764	)		4,333		(764	)
Mortgage-backed securities		68,031		(2,036	)		925		—			68,956		(2,036	)
Total temporarily impaired securities	$	118,634	$	(3,371	)	$	5,755	$	(780	)	$	124,389	$	(4,151	)
December 31, 2012:
U.S. government agencies	$	4,994	$	(6	)	$	—	$	—		$	4,994	$	(6	)
State, county and municipal securities		15,595		(199	)		505		(11	)		16,100		(210	)
Corporate debt securities		—		—			4,560		(547	)		4,560		(547	)
Mortgage-backed securities		23,951		(181	)		3,617		(23	)		27,568		(204	)
Total temporarily impaired securities	$	44,540	$	(386	)	$	8,682	$	(581	)	$	53,222	$	(967	)
June 30, 2012:
U.S. government agencies	$	—	$	—		$	—	$	—		$	—	$	—
State, county and municipal securities		10,342		(74	)		—		—			10,342		(74	)
Corporate debt securities		—		—			6,562		(517	)		6,562		(517	)
Mortgage-backed securities		31,680		(167	)		5,040		(28	)		36,720		(195	)
Total temporarily impaired securities	$	42,022	$	(241	)	$	11,602	$	(545	)	$	53,624	$	(786	)